JP2008027169A - Design support device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a design support device and method capable of displaying two portions that differ in three-dimensional configurations, from a direction that is suited for viewing them, even without requiring a user to operate the device. <P>SOLUTION: A differently configured surface grouping part 13 groups surfaces that differ in configuration before and after a change into surface groups each consisting of adjacent surfaces. For each surface group, an optimal line-of-sight vector calculating part 15 calculates the number of times that a vector extending in the direction of each of a plurality of predefined line-of-sight vectors from a respective center point interferes with the surfaces, and determines the optimal line-of-sight vector on the basis of the line-of-sight vector that interferes with the surfaces the least amount of times. For a surface group of interest, a configuration difference display part 17 outputs to an output device 9 an overall configuration before the change, the configuration of the surface group, and a configuration after the change corresponding to the surface group, as seen from the direction opposite to the direction of the optimal line-of-sight vector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a design support apparatus and design support method for improving the efficiency of design work, and more particularly, to display design changes of a three-dimensional model created by a three-dimensional CAD (Computer Aided Design) system. The present invention relates to a design support device and a design support method.

  In recent years, when designing products, it has become mainstream to design using computer-based three-dimensional CAD. When the design department uses 3D CAD to design, and other departments such as the mold production department make design changes, the other departments such as the mold production department can CAD data and a document indicating design change contents are created and provided by handwriting. Therefore, there is a problem that a long time is required for feedback and design efficiency is lowered.

  As a first conventional technique for improving the efficiency of design work, there is a design change management tool incorporated in a three-dimensional CAD system. The design change management tool converts an input design change instruction into shape data of a 3D model, and converts the corresponding shape data among the 3D model data to be changed read from the storage means into the converted shape. Replace with data. When the 3D model data is displayed, a mark indicating the changed part is displayed. Furthermore, it is possible to compare the three-dimensional model data before and after the change, extract the change contents, and document the extraction result. When it becomes necessary to make a design change, the change contents are reflected in the three-dimensional model simply by creating the design change instruction information. Therefore, it is possible to omit the work of displaying the model on the three-dimensional CAD system, correcting the model, and storing the model in the storage device.

  As a second conventional technique for improving the efficiency of design work, there is a three-dimensional model processing apparatus. The three-dimensional model processing device calculates a direction to view the model of the three-dimensional data stored in the three-dimensional model storage unit with reference to a specific position of the three-dimensional model specified by the user, and the calculation result In response, the three-dimensional model is displayed on a flat display. For example, when the specific position specified by the user is a corner of the three-dimensional model, the direction opposite to the average of the vectors of the three ridge directions including the corner is set as the viewpoint direction. The viewpoint direction for viewing the three-dimensional model is simplified so that it can be designated by a method that fits human sense as much as possible, and the design work of the three-dimensional model is made more efficient (see, for example, Patent Document 2).

  As a third conventional technique for improving the efficiency of design work, there is a graphic editing apparatus. This graphic editing apparatus detects a difference in graphic information before and after correction, recognizes the correction content from the detected difference, and generates graphic information to which a correction mark corresponding to the correction content is added. Further, the generated graphic information, that is, a graphic with a correction content and a correction mark indicating a correction portion is displayed and output. When the created graphic information is corrected, the correction location and the correction content can be displayed and output, and an efficient graphic correction operation can be performed (see, for example, Patent Document 3).

JP 2002-279004 A JP-A-8-101926 Japanese Patent Laid-Open No. 7-129643

  The third conventional technique is for displaying and outputting the correction part and the correction content of the graphic information before and after correction, but it is for a two-dimensional shape and cannot be applied to a three-dimensional shape as it is. There's a problem.

  The first conventional technique can identify a changed portion and display a mark indicating the changed portion, but is linked to a three-dimensional CAD system for creating a model shape, and linked to the three-dimensional CAD system. However, there is a problem in that a mark indicating a changed portion cannot be displayed for a three-dimensional model created without using the three-dimensional model. Furthermore, since there is no means for designating the direction in which the changed part is viewed, there is a problem that when the design change is displayed, the user must perform an operation for rotation or enlargement while viewing the screen.

  In the second conventional technique, the viewpoint direction for viewing the three-dimensional model is specified and displayed by a method that matches a human sense, but the viewpoint direction is determined for a specific position of the three-dimensional model specified by the user. However, there is a problem that the user has to perform an operation for designating a position.

  An object of the present invention is to provide a design support apparatus and a design support method capable of displaying a location having a difference between two three-dimensional shapes from a direction suitable for viewing the location without a user's operation. That is.

The present invention provides an acquisition means for acquiring three-dimensional CAD data of two three-dimensional shapes to be compared from a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces;
Of the two three-dimensional shapes indicated by the three-dimensional CAD data acquired by the acquisition means, the surface of one three-dimensional shape and the surface of another three-dimensional shape are associated with each other by the surface identification information, and are compared. An extraction means for extracting identification information of a surface not to be compared and identification information of both surfaces whose shapes to be compared do not match;
Each surface indicated by the surface identification information extracted by the extraction means is divided into a group consisting of surfaces adjacent to each other for surfaces with adjacent surfaces, and a group consisting of only those surfaces for surfaces without adjacent surfaces. Grouping means to divide into
For each group divided by the grouping means, a vector that is based on the barycentric position of the three-dimensional group shape formed by the surfaces included in each group and that satisfies a predetermined optimum condition is determined. An optimal vector determining means;
When the target group shape of the group selected from among the group shapes of the group divided by the grouping means, the three-dimensional shape that includes the target group shape, and the surface that forms the target group shape include the comparison target surface Includes an output unit that outputs the group shape of the group including the comparison target surface to the output device in a shape viewed from the direction opposite to the direction of the optimal vector determined by the optimal vector determination unit with respect to the target group shape. This is a design support apparatus characterized by that.

  According to the present invention, the acquisition unit acquires three-dimensional CAD data of two three-dimensional shapes to be compared from a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces. The three-dimensional surface of one of the two three-dimensional shapes indicated by the three-dimensional CAD data acquired by the acquiring unit is associated with the surface of the other three-dimensional shape by the surface identification information. The identification information of the surface that is the comparison target and the comparison target surface and the identification information of both surfaces that do not match the shape of the comparison target surface are extracted. For surfaces that have adjacent surfaces, surfaces that are adjacent to each other Divided into Ranaru group, for there is no adjacent surface surfaces are divided into groups of the surface only.

  Further, for each group divided by the grouping means by the optimum vector determining means, a vector based on the center of gravity position of the three-dimensional group shape formed by the surface included in each group, An optimal vector that satisfies the conditions is determined, and the output unit selects a group shape of the group selected from the group shapes divided by the grouping unit, a three-dimensional shape that includes the group shape of interest, and a group of interest When there is a comparison target surface in the surface forming the shape, the group shape of the group including the comparison target surface is viewed from the direction opposite to the direction of the optimal vector determined by the optimal vector determination means for the target group shape. In shape, output to output device Therefore, even if the user does not operate, one of the two three-dimensional shapes and the corresponding two partial shapes having a difference are suitable for viewing the difference portion. Output from eg can be displayed.

Further, in the present invention, the two three-dimensional shapes to be compared acquired by the acquisition means are the three-dimensional shape before the change and the three-dimensional shape after the change of the three-dimensional shape,
The output means includes the group shape including the comparison target surface when the target group shape, the three-dimensional shape including the target group shape, and the surface forming the target group shape include a comparison target surface. When the combination shape consisting of the corresponding group shape is output to the output device, the surface indicated by the surface identification information extracted by the extraction means is distinguished from the surface other than the surface indicated by the extracted surface identification information. Output, adding information indicating the position occupied by the group shape of interest in the three-dimensional shape that includes the group shape of interest, and expanding and outputting the group shape of interest and the corresponding group shape. Features.

  According to the present invention, the two three-dimensional shapes to be compared acquired by the acquiring means are the three-dimensional shape before the change and the three-dimensional shape after the change of the three-dimensional shape, and the output means A shape, a three-dimensional shape that includes the group shape of interest, and a corresponding group shape that is a group shape that includes the surface of the comparison target surface if the surface forming the group shape of interest has a comparison target surface. When the combined shape is output to the output device, the surface indicated by the surface identification information extracted by the extraction means is output separately from the surface other than the surface indicated by the extracted identification information, and the target group shape is Information indicating the position occupied in the three-dimensional shape containing the group shape of interest is added and output, Since the eye group shape and the corresponding group shape are enlarged and output, for the three-dimensional shape before and after the change, it is easy to find the changed part in the whole and the surface that is different between before and after the change. You can see the differences in detail.

  In the present invention, the predetermined optimum condition is that each of a plurality of predetermined vectors based on the center of gravity position of the group shape of each group is a surface constituting a three-dimensional shape including each group shape. For the number of intersecting surfaces, which is the number of surfaces intersecting the surface excluding the surface of the group shape, if there is one vector with the smallest number of intersecting surfaces, the condition is that the vector has the smallest number of intersecting surfaces. When the number of vectors having the smallest number of faces is two or more, the condition is that the vector is the sum of the vectors having the smallest number of faces.

  According to the present invention, the optimal condition determined in advance is that each of a plurality of predetermined vectors based on the center of gravity position of the group shape of each group is a surface constituting a three-dimensional shape including each group shape. For the number of intersecting surfaces, which is the number of surfaces intersecting with the surface excluding the surface of the group shape, if there is one vector with the smallest number of intersecting surfaces, the condition is that the vector has the smallest number of intersecting surfaces. When there are two or more vectors with the smallest number of faces, it is a condition that the vector is the sum of the vectors with the smallest number of intersecting faces, and therefore, it can be seen from the direction that is least obstructed by other surfaces.

The present invention also includes storage means;
Image capturing means for capturing an attention group shape output to the output device by the output means, a three-dimensional shape including the attention group shape, and a corresponding group shape as an image;
Document generation means for generating a document in a predetermined format for each group using the image captured by the image capture means, and storing document information representing the generated document in the storage means;
The output means outputs document information stored in the storage means to an output device.

  According to the present invention, the image capturing unit captures the target group shape output to the output device by the output unit, the three-dimensional shape including the target group shape, and the corresponding group shape as an image, and generates the document. By using the image captured by the image capturing means, a document in a predetermined format is generated for each group, document information representing the generated document is stored in the storage means, and stored in the storage means by the output means. Since the document information is output to the output device, the information output on the screen or the like can be automatically documented.

In the present invention, the three-dimensional CAD data stored by the storage device includes surface identification information for each surface of each three-dimensional shape,
If each surface identification information extracted by the extraction means is included in the three-dimensional CAD data before the change and is not included in the three-dimensional CAD data after the change, the surface change mode indicated by the surface identification information is erased. If it is determined that it is not included in the three-dimensional CAD data before the change and is included in the three-dimensional CAD data after the change, it is determined that the surface change mode indicated by the surface identification information is additional, and the three before the change Determining means for determining that the change mode of the surface indicated by the surface identification information is a change when included in the three-dimensional CAD data and the three-dimensional CAD data after the change;
A change history unit that associates the surface identification information extracted by the extraction unit with the change mode information representing the change mode determined for each surface by the determination unit and stores the change mode information in the storage unit; And

  According to the present invention, the three-dimensional CAD data stored in the storage device includes surface identification information for each surface of each three-dimensional shape, and each surface identification information extracted by the extraction unit by the determination unit is not changed. If it is included in the three-dimensional data and not included in the three-dimensional data after the change, it is determined that the surface change mode indicated by the surface identification information is erased, and is not included in the three-dimensional data before the change and after the change If it is included in the three-dimensional data, it is determined that the change mode of the surface indicated by the surface identification information is additional, and if included in the three-dimensional data before and after the change, the surface identification information is It is determined that the change mode of the surface shown is a change, and the surface identification information extracted by the extraction means by the change history means Since the change mode information indicating the change mode determined for each surface by the determination unit is associated and stored by the storage unit, addition, deletion, or change of each difference between before and after the change is performed. The change mode information shown can be stored in the storage means.

According to the present invention, the storage device is dimensional information relating to dimensions of each side forming the periphery of each surface of the three-dimensional shape before and after the change, and the dimension for identifying each dimension. Dimension information including identification information is stored for each surface identification information,
The acquisition means acquires dimensional information for each surface identification information from a storage device,
Search means for searching for surface identification information associated with change mode information whose change mode is change from among surface identification information stored in the storage unit;
Among the dimension information acquired by the acquisition means, from the dimension information including the surface identification information searched by the search means, extract dimension information having a difference between the dimension information before the change and the dimension information after the change, Dimension information extraction means for storing the extracted dimension information in correspondence with the surface identification information as dimension change information by the storage means is further included.

  According to the present invention, the storage device is dimensional information regarding the dimensions of each side forming the periphery of each surface of the three-dimensional shape before and after the change, and the dimensions for identifying each dimension. Dimension information including identification information is stored for each surface identification information, the dimensional information for each surface identification information is acquired from the storage device by the acquisition means, and changed from the surface identification information stored in the storage means by the search means. The surface identification information associated with the change mode information whose mode is change is searched, and the dimension including the surface identification information searched by the search unit out of the dimension information acquired by the acquisition unit by the dimension information extraction unit. From the information, the dimension information that is different between the dimension information before the change and the dimension information after the change is extracted, and the extracted dimension information is the surface information. Since stored by association is in the storage means as the size change information to the information, it is possible to store the size information before and after the change in each dimension of the difference before and after the change in the storage means.

  According to the present invention, when the output unit outputs the combination shape to an output device, the output unit associates with the surface identification information of the surface included in the attention group shape among the change mode information stored by the storage unit. The modification mode information thus added is added and output.

  According to the present invention, when the combination shape is output to the output device by the output unit, the change mode information stored by the storage unit is associated with the surface identification information of the surface included in the target group shape. Since the change mode information is added and output, it can be displayed on a screen or the like indicating whether it is added, deleted, or changed at a place where there is a difference between before and after the change.

  According to the present invention, when the document generation unit generates the document in the predetermined format, the change mode information stored by the storage unit is associated with the surface identification information of the surface included in the attention group shape. It is characterized in that the generated change mode information is added.

  According to the present invention, when a document in a predetermined format is generated by the document generation unit, the change mode information stored by the storage unit is associated with the surface identification information of the surface included in the target group shape. Since the change mode information is added and generated, it is possible to make a document showing addition, deletion, or change in the difference between before and after the change.

  According to the present invention, when the output unit outputs the combination shape to the output device, the size change information stored by the storage unit is associated with the surface identification information of the surface included in the target group shape. The dimensional change information is added and output.

  According to the present invention, when the combination shape is output to the output device by the output unit, it is associated with the surface identification information of the surface included in the target group shape among the dimension change information stored by the storage unit. Since the dimensional change information is added and outputted, the dimensions before and after the change can be displayed on a screen or the like at the difference between before and after the change.

  According to the present invention, when the document generation unit generates the document in the predetermined format, the document generation unit associates the surface change information stored in the storage unit with the surface identification information of the surface included in the target group shape. It is characterized in that the generated dimension change information is added.

  According to the present invention, when a document in a predetermined format is generated by the document generation unit, the size change information stored by the storage unit is associated with the surface identification information of the surface included in the group shape of interest. Since the dimension change information is added and generated, it is possible to make a document that shows the dimensions before and after the change in the difference between before and after the change.

The present invention further includes input means for inputting movement amount information representing a movement amount, rotation angle information representing a rotation angle, and magnification information representing an enlargement / reduction magnification,
The output means inputs the group shape of the group of interest and the group shape of the group including the surface of the comparison target if there is a surface to be compared to the surface forming the group of interest group shape. It is moved by the amount of movement indicated by the amount information, rotated by the rotation angle indicated by the rotation angle information input by the input means, and further enlarged or reduced by the magnification indicated by the magnification information input by the input means and output. And

  According to the present invention, movement amount information representing the movement amount, rotation angle information representing the rotation angle, and magnification information representing the enlargement / reduction magnification are input by the input means, and the attention group shape and the attention group are output by the output means. If there is a comparison target surface in the surface forming the shape, the group shape of the group including the comparison target surface is moved by the movement amount indicated by the movement amount information input by the input means, and input by the input means Is rotated by the rotation angle indicated by the rotation angle information, and is further enlarged or reduced by the magnification indicated by the magnification information input by the input means, so that the target group shape and the group shape to be compared are moved. It can be rotated and scaled for output.

  Further, according to the present invention, the predetermined optimum condition is that, for each of a plurality of predetermined vectors based on the center of gravity position of the group shape of each group, among the surfaces constituting the three-dimensional shape including each group shape, After determining the number of intersecting surfaces, which is the number of surfaces where each vector intersects with the surface excluding the surface of the group shape, the group shape of the group including the surface whose change mode is determined to be changed by the determining means Compare the vector with the smallest number of intersecting faces among the vectors of the attention group shape and the vector with the smallest number of intersecting faces among the vectors of the corresponding group shape corresponding to the attention group. If there is a single vector, it is a condition that the vector is in the same direction. Torr may be two or more, characterized in that it is a condition that is the vector sum of the two or more vectors.

  According to the present invention, the optimal condition determined in advance is, for each of a plurality of predetermined vectors based on the centroid position of the group shape of each group, among the surfaces constituting the three-dimensional shape including each group shape, respectively. After obtaining the number of intersecting surfaces, which is the number of surfaces where each vector intersects with the surface excluding the surface of the group shape, the group shape of the group including the surface whose surface is determined to be changed by the judging means Compare the vector with the fewest number of intersecting faces among the vectors of the attention group shape with the vector with the smallest number of intersecting faces among the vectors of the corresponding group shape corresponding to the attention group. Is the same direction vector, the same direction vector If there are two or more, it is a condition that the vector is the sum of the two or more vectors, so that the group shape before and after the change can be output or displayed in a shape seen from a common viewpoint where both can be seen well. it can.

  According to the present invention, the output means includes a first part including a noticeable group shape and a peripheral part of the group shapes of the group including the surface whose change mode is determined to be changed by the determination means; When outputting together the corresponding group shape corresponding to the target group shape and the second part including the periphery of the corresponding group shape and located at the position corresponding to the first part, the target group shape and the corresponding group It is characterized in that the larger one of the shapes is output with being enlarged or reduced at the same magnification so as to have the maximum size.

  According to the present invention, the first means including the attention group shape of the group shape of the group including the surface whose surface is determined to be changed by the determination means by the output means, and the attention thereof. When the corresponding group shape corresponding to the group shape and the second portion including the periphery of the corresponding group shape and at the position corresponding to the first portion are output together, the attention group shape and the corresponding group Since the larger one of the shapes is enlarged or reduced at the same magnification so that it becomes the maximum size, both the group shapes before and after the change will fit on the screen and be enlarged to fill the screen. Can do.

The present invention also includes an acquisition step of acquiring three-dimensional CAD data of two three-dimensional shapes to be compared from a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces.
Of the two three-dimensional shapes indicated by the three-dimensional CAD data acquired in the acquisition step, the surface of one three-dimensional shape and the surface of the other three-dimensional shape are associated with each other by the surface identification information to be compared, An extraction process for extracting the identification information of the non-comparison surface and the identification information of both surfaces whose shapes do not match,
Each surface indicated by the surface identification information extracted in the extraction process is divided into groups that are adjacent to each other for surfaces with adjacent surfaces, and groups that are only those surfaces for surfaces that do not have adjacent surfaces. Grouping process divided into
For each group divided in the grouping process, a vector that is based on the position of the center of gravity of the three-dimensional group shape formed by the surfaces included in each group is determined, and an optimal vector that satisfies a predetermined optimal condition is determined. An optimal vector determination step;
When the target group shape of the group selected from the group shapes of the group divided in the grouping process, the three-dimensional shape that contains the target group shape, and the surface that forms the target group shape have a comparison target surface Includes an output step of outputting the group shape of the group including the comparison target surface to the output device in a shape viewed from the direction opposite to the direction of the optimal vector determined in the optimal vector determination step for the target group shape. This is a design support method characterized by this.

  According to the present invention, in the acquisition step, three-dimensional CAD data of two three-dimensional shapes to be compared are acquired from a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces. In the extraction process, one of the two three-dimensional shapes indicated by the three-dimensional CAD data acquired in the acquisition process is associated with the other three-dimensional surface by the surface identification information. The identification information of the surface that is not compared and the identification information of both surfaces that do not match the shape of the comparison target surface are extracted, and the surface identification information extracted in the extraction process shows in the grouping process For surfaces with adjacent surfaces, divide the surface into groups of adjacent surfaces and For E vinegar no surface, divided into groups of the surface only.

  Further, in the optimum vector determination step, for each group divided in the grouping step, a vector based on the center of gravity position of the three-dimensional group shape formed by the surface included in each group, An optimal vector satisfying the condition is determined, and in the output process, the attention group shape of the group selected from the group shapes of the group divided in the grouping process, the three-dimensional shape including the attention group shape, and the attention group When there is a surface to be compared in the surface forming the shape, the group shape of the group including the surface to be compared is viewed from the direction opposite to the direction of the optimal vector determined for the target group shape in the optimal vector determination process. Because it is output to the output device in shape, even if the user does not operate One three-dimensional shape of the two three-dimensional shape, and a corresponding two partial shape of the difference can be displayed from the direction suitable for viewing the locations of the difference.

  According to the present invention, even if the user does not operate, one 3D shape out of two 3D shapes and two corresponding partial shapes having a difference can be viewed in the difference portion. Since the display can be performed from a suitable direction, the user can save the trouble of searching for a direction in which a portion having a difference in shape can be seen well, and can easily compare the difference between the two shapes.

  In addition, according to the present invention, for the three-dimensional shape before and after the change, it is possible to easily find the changed part in the whole and the surface having a difference before and after the change, and see the difference between the two shapes in detail. It is possible to reliably grasp the contents of the design change.

  Further, according to the present invention, since it is possible to see from the direction that is least obstructed by other surfaces, the difference before and after the change can be grasped more reliably.

  Further, according to the present invention, the information output on the screen or the like can be automatically documented, so that it is possible to reduce the effort of the designer for creating the document and how the shape is changed before and after the change. Information regarding whether or not they are different can be provided as a document to parties other than the designer.

  Further, according to the present invention, the change mode information indicating addition, deletion, or change for each portion having a difference before and after the change can be stored in the storage means, so that the user can change the change stored in the storage means. By referring to the mode information, the contents of the design change can be roughly grasped.

  Further, according to the present invention, since the dimension information before and after the change can be stored in the storage unit for each dimension having a difference before and after the change, the user can refer to the dimension information stored in the storage unit for details. Can understand the details of design changes.

  In addition, according to the present invention, it is possible to display additions, deletions, or changes in different places before and after the change and display them on a screen or the like, so that the user can roughly grasp the contents of the design change from the screen or the like. can do.

  In addition, according to the present invention, it is possible to make a document showing additions, deletions, or changes in places where there is a difference between before and after the change, so that the parties can roughly grasp the contents of the design change from the document. Can do.

  In addition, according to the present invention, since the dimensions before and after the change can be displayed on the screen or the like in the difference between before and after the change, the user can grasp the detailed design change contents from the screen or the like. .

  Further, according to the present invention, since it is possible to make a document showing the dimensions before and after the change at a place where there is a difference between before and after the change, the related person can grasp the detailed design change contents from the document.

  Further, according to the present invention, the group shape of interest and the group shape to be compared can be moved, rotated, and enlarged / reduced and output, so that the user can see in an easier-to-see manner.

  Further, according to the present invention, the group shape before and after the change can be output, that is, displayed in a shape seen from a common viewpoint, so that the user can easily grasp the contents of the design change. In particular, even when the shape whose design has been changed has moved from the position before the change, the user can easily grasp the contents of the design change.

  Further, according to the present invention, both the group shapes before and after the change fit on the screen and can be enlarged and displayed on the full screen, so that the user can easily grasp the contents of the design change. In particular, even when the shape whose design has been changed has moved from the position before the change, the user can easily grasp the contents of the design change.

  Further, according to the present invention, even if the user does not operate, one 3D shape of two 3D shapes and two corresponding partial shapes having a difference can be viewed at the difference portion. Therefore, the user can save time and effort to find a direction in which a portion having a difference in shape can be seen well, and can easily compare the difference between the two shapes.

  FIG. 1 shows a configuration of a design change display apparatus 1 according to an embodiment of the present invention and an apparatus related thereto. A design change display device 1 as a design support device includes a model data reading unit 11, a shape difference surface detection unit 12, a shape difference surface grouping unit 13, a shape difference group storage device 14, an optimum line-of-sight vector calculation unit 15, and a shape difference surface enhancement. The display unit 16 and the shape difference display unit 17 are included, and are connected to the model data storage device 8, the output device 9, and an input device (not shown).

  The design change display device 1 is not shown, such as a central processing unit (not shown) such as a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores programs and data, a RAM (Random Access Memory), or a hard disk device. The model data reading unit 11, the shape difference surface detection unit 12, the shape difference surface grouping unit 13, the optimum line-of-sight vector calculation unit 15, which is configured by a storage device and the central processing unit executes a program stored in the storage device, Each function of the shape difference surface emphasis display unit 16 and the shape difference display unit 17 is realized. The design support method is a method processed by the design change display device 1 by executing a program stored in a storage device (not shown).

  The model data storage device 8 is a storage device composed of, for example, a hard disk device, and stores or stores three-dimensional CAD data created by a three-dimensional CAD (Computer Aided Design) system. The three-dimensional CAD data will be described later with reference to FIG. 3, such as three-dimensional shape data representing a three-dimensional shape, a model name of the three-dimensional shape, a data size of the three-dimensional shape data, and an update date and time of the three-dimensional shape data. Information. The output device 9 is a display device such as a CRT (Cathode Ray Tube) or a liquid crystal display. An input device (not shown) is an input device such as a keyboard or a mouse.

  The model data reading unit 11 reads two three-dimensional CAD data having a three-dimensional shape from the model data storage device 8. The read three-dimensional CAD data may be stored in a storage device (not shown). The read three-dimensional CAD data is, for example, three-dimensional CAD data of a three-dimensional shape before and after the change of the comparison target specified by a model name input by an input device (not shown).

  The shape difference surface detection unit 12 includes a surface constituting one three-dimensional shape of two three-dimensional shapes indicated by the three-dimensional CAD data read by the model data reading unit 11 and a surface constituting another three-dimensional shape. To detect surfaces with different shapes. Specifically, by comparing the surfaces of two three-dimensional shapes with the surface ID (Identification) for identifying each surface in one three-dimensional shape, the same as a surface without the same surface ID is compared. Both surfaces whose shapes do not match in the surface with the surface ID are detected as surfaces having different shapes. The surface ID is a surface name 91 indicating the name of each surface and information such as an edge ID for identifying each side (hereinafter referred to as “edge”) that forms the periphery of each surface, as well as surface information 91 described later in FIG. The information included is acquired from the model data storage device 8 by the shape difference surface detector 12 and stored in the shape difference group storage device 14 for each three-dimensional shape.

  The shape difference surface grouping unit 13 divides the surfaces detected by the shape difference surface detection unit 12 into groups composed of adjacent surfaces (hereinafter referred to as “shape difference surface group” or simply “surface group”). For example, of the edge IDs included in the surface information 91, two surfaces sharing an edge with the same edge ID are adjacent surfaces. Based on the edge ID of the surface information 91, the shape difference surface grouping unit 13 divides the surfaces detected by the shape difference surface detection unit 12 into shape difference surface groups including surfaces adjacent to each other. A surface that does not have an adjacent surface is a group consisting of only that surface.

  Further, a bounding box surrounding a three-dimensional shape formed by the surfaces included in one surface group is generated for each surface group, and the maximum point, the minimum point, and the center point are calculated for each bounding box. The bounding box is a rectangular parallelepiped in which a ridge line is formed by a straight line parallel to each coordinate axis in a three-dimensional coordinate system, for example, an xyz coordinate system, and is the smallest rectangular solid including a surface group. The maximum point is the vertex farthest from the origin of the xyz coordinate system, and the minimum point is the vertex closest to the origin of the xyz coordinate system. Information representing the calculated maximum point, minimum point, and center point is stored in the shape difference group storage device 14 as surface group information 92 described later with reference to FIG.

  The shape difference group storage device (hereinafter also referred to as “shape difference surface group storage device”) 14 is a design change display device 1 such as surface information 91 and surface group information 92 about the surface group divided by the shape difference surface grouping unit 13. The information used in is stored. The shape difference group storage device 14 may be included in the storage device (not shown) described above, or may be configured as a storage device different from the storage device (not shown), for example, a storage device including a hard disk device.

  For each surface group indicated by the surface group information 92 stored in the shape difference group storage device 14, the optimum line-of-sight vector calculation unit 15 determines a plurality of predetermined values from the center of gravity of each surface group, for example, the center point of the bounding box of each surface group. The number of times of interference with a surface that is the same three-dimensional surface as the vector extended in the direction of the line-of-sight vector and other than each surface group is calculated for each line-of-sight vector. That is, for each line-of-sight vector, the number of surfaces that each line-of-sight vector intersects is calculated. When the number of line-of-sight vectors with the smallest number of interferences is one, the smallest line-of-sight vector is determined as the optimum line-of-sight vector, and when the number of line-of-sight vectors with the smallest number of interferences is two or more, the two or more line-of-sight vectors are used. Is determined as the optimal line-of-sight vector. The base point of the line-of-sight vector is the center point of the bounding box, but may be the center of gravity of the three-dimensional shape formed by the surface group.

  The shape-difference surface highlighting unit 16 distinguishes the surface detected by the shape-difference surface detection unit 12, that is, the changed surface from the surface that has not been changed. For example, the changed surface is highlighted or not changed. Set to display brighter than the surface or different from the color of the surface that was not changed. The setting is performed, for example, by adding to the surface information 91 distinction information indicating that a changed surface is displayed separately from a surface that has not been changed.

  The shape difference display unit 17 includes, for the surface group of interest, for example, one surface group selected from the surface groups before the change among the surface groups divided by the shape difference surface grouping unit 13, If there is a surface group in the modified surface group that includes the shape of the surface group of interest (hereinafter referred to as the “surface of interest group”) and a surface having the same surface ID as the surface of the surface of interest group, the modified surface group ( The shape of the “corresponding surface group” (hereinafter referred to as “corresponding surface group”) is output to the output device 9 in a shape viewed from the direction opposite to the direction of the optimum line-of-sight vector determined by the optimum line-of-sight vector calculation unit 15. When the surface group including the surface having the same surface ID as the surface of the surface group of interest is not in the changed surface group, the peripheral portion of the corresponding position for the changed three-dimensional shape may be output.

  At that time, if the distinction information is added to the surface information 91, the shape difference display unit 17 outputs the changed surface in a highlighted or different color and outputs the information indicating the position of the target surface group in the entire shape. Append to Further, the magnification for enlarging the shape of the surface group of interest and the shape of the corresponding surface group is calculated according to the procedure described later with reference to FIG. 14, and the shape of the surface group of interest and the shape of the corresponding surface group are enlarged and output at the calculated magnification. . In the above description, the attention surface group is the surface group before the change, but the attention surface group may be the surface group after the change. In this case, the corresponding surface group is the surface group before the change, and the overall shape to be output is the overall shape after the change.

  FIG. 2 shows a configuration of the optimum line-of-sight vector calculation unit 15 shown in FIG. The optimal line-of-sight vector calculation unit 15 includes a line-of-sight vector interference frequency calculation unit 151, a line-of-sight vector interference frequency storage device 152, and a minimum interference frequency line-of-sight vector calculation unit 153. The line-of-sight vector interference number calculation unit 151 is a vector extended from the center point of each surface group in the direction of a plurality of line-of-sight vectors, for each surface group indicated by the surface group information 92 stored in the shape difference group storage device 14. Then, the number of times of interference with surfaces of the same three-dimensional shape other than each surface group is calculated for each line-of-sight vector. That is, for each line-of-sight vector, the number of surfaces that each line-of-sight vector intersects is calculated. The calculated number of times of interference for each line-of-sight vector is stored in the line-of-sight vector interference number storage device 152 for each surface group.

  The line-of-sight vector interference number storage device 152 stores the number of surfaces for each line-of-sight vector calculated by the line-of-sight vector interference number calculation unit 151. The line-of-sight vector interference frequency storage device 152 may be included in the above-described storage device (not shown), or may be configured as a storage device including, for example, a hard disk device other than the storage device (not shown).

  The minimum number of interference line-of-sight vector calculation unit 153 extracts the line-of-sight vector with the smallest number of interferences for each surface group from the number of interferences for each line-of-sight vector stored in the line-of-sight vector interference number storage device 152. When the number of extracted line-of-sight vectors is one, that single line-of-sight vector is determined as the optimum line-of-sight vector, and when the number of extracted line-of-sight vectors is two or more, the sum of the two or more line-of-sight vectors is determined as the optimum line-of-sight vector. Determine for each surface group.

  FIG. 3 shows a part 90 of the three-dimensional CAD data stored in the model data storage device 8 shown in FIG. The three-dimensional CAD data includes three-dimensional shape data representing a three-dimensional shape, a model name for identifying the three-dimensional shape, a data size indicating the data capacity of the three-dimensional shape data, and the three-dimensional shape data updated. Information such as an update date and time indicating the date and time when the date was recorded. FIG. 3 shows the model name, data size, and update date / time. Different model names are named before and after the change.

  In FIG. 3, “model name” “name”, data size “size”, and “update date and time” are shown for each name. For example, the name “Cab.prt” has a size of “4,000 KB” and an update date and time of “2005/10/17 19:00”. Similarly, the name “Cab_2.prt” has a size of “4,122 KB” and an update date and time of “2005/10/20 14:00”. The name “Cover.prt” has a size of “2,000 KB” and an update date and time of “2005/10/17 15:20”. The name “Cover_2.prt” has a size of “2,500 KB” and an update date / time of “2005/10/20 13:20”. The name “Bottom.prt” has a size of “3,222 KB” and an update date / time of “2005/10/17 13:00”. The name “Bottom_2.prt” has a size of “3,000 KB” and an update date and time of “2005/10/20 10:00”.

  FIG. 4 shows surface information 91 of the surface detected by the shape difference surface detection unit 12 shown in FIG. The surface information 91 is information in which a “surface name” indicating the name of each surface, a “surface ID” for identifying each surface, and an “edge ID” of an edge forming each surface are associated with each other. It is stored in the shape difference group storage device 14. For the surface name “surface S1”, the surface ID is “2245” and the edge IDs are “9123, 9124, 9125, and 9126”. Similarly, for the surface name “surface S2”, the surface ID is “2246” and the edge IDs are “9126, 9127, 9128, and 9129”. For the surface name “surface S3”, the surface ID is “2247” and the edge IDs are “9129, 9130, 9131, and 9132”. For the surface name “surface S4”, the surface ID is “1467” and the edge IDs are “9223, 9224, 9225, and 9226”.

  The edge ID 9126 of the surface S1 and the edge ID 9126 of the surface S2 are the same edge ID, and the surface S1 and the surface S2 are adjacent to each other. Further, the edge ID 9129 of the surface S2 and the edge ID 9129 of the surface S3 are the same edge ID, and the surface S2 and the surface S3 are adjacent to each other.

  FIG. 5 shows an example of the surface group divided by the shape difference surface grouping unit 13 shown in FIG. Surface group No. consisting of surface S1, surface S2, and surface S3. 1 and a surface group No. consisting of only the surface S4. 2 is shown. The surface S2 is adjacent to the surface S1 at the edge of edge ID 9126 and adjacent to the surface S3 at the edge of edge ID 9129 from the surface information 91 shown in FIG.

  FIG. 6 shows an example of the bounding box 40 of the surface group shown in FIG. For example, in the xyz coordinate system, the bounding box 40 is a rectangular parallelepiped in which a ridge line is formed by a straight line parallel to each coordinate axis, and is the smallest rectangular parallelepiped including a surface group. The bounding box 40 is defined by a minimum point and a maximum point in the xyz coordinate system. The minimum point is the point closest to the origin of the xyz coordinate system, and the maximum point is the point farthest from the origin of the xyz coordinate system. FIG. 6 shows a minimum point 41, a maximum point 42, and a center point 43 of the bounding box 40.

  FIG. 7 shows an example of the surface group information 92 of the surface group shown in FIG. The surface group information 92 includes a “group number” for identifying the surface group, a “surface ID” of the surfaces constituting the surface group, and the size of the surface group by the coordinates of the minimum point and the coordinates of the maximum point. This is information in which the “size of the shape difference group” and the “center point of the shape difference group” indicating the coordinates of the center point of the surface group are associated with each other. Group No. The surface group 1 has a surface ID “2245, 2246, 2247”, and the size of the shape difference group is “(100.0, 200.0, 50.0), (500.0, 600.0, 450.0) ”and the center point of the shape difference group is“ (300.0, 400.0, 250.0) ”. Group No. The surface group of 2 has a surface ID “1467” and the size of the shape difference group is “(100.0, 350.0, 100.0), (300.0, 450.0, 300.0)”. The center point of the shape difference group is “(200.0, 400.0, 200.0)”.

  FIG. 8 shows an example of a three-dimensional shape before and after the change, which is a comparison target by the design change display device 1 shown in FIG. FIG. 8A shows the three-dimensional shape 51 before the change, and the partial shape at the center of the three-dimensional shape 51 is the surface group 511. FIG. 8B shows the changed three-dimensional shape 52, and the partial shape at the center of the three-dimensional shape 52 is the surface group 521. The surface group 521 after the change is larger than the surface group 511 before the change.

  FIG. 9 shows an example of a surface having a difference in the three-dimensional shape 51 before the change detected by the shape difference surface detection unit 12 shown in FIG. Surfaces detected by the shape difference surface detection unit 12 are surfaces a <b> 1 to a <b> 5 and are included in the surface group 511. That is, the surface group 511 is a surface group configured by the surfaces a1 to a5.

  FIG. 10 shows an example of a surface having a difference in the three-dimensional shape 52 after the change detected by the shape difference surface detection unit 12 shown in FIG. Surfaces detected by the shape-difference surface detection unit 12 are surfaces b1 to b5 and are included in the surface group 521. That is, the surface group 521 is a surface group configured by the surfaces b1 to b5.

  FIG. 11 is a diagram for explaining the number of line-of-sight vectors used in the optimum line-of-sight vector calculation unit 15 shown in FIG. In FIG. 11, a dice is taken as an example in order to explain the number of line-of-sight vectors. In the case of a dice, for example, 26 predetermined line-of-sight vectors are prepared. Each dice shown in FIG. 11 shows a shape viewed from a direction opposite to the direction of the line-of-sight vector. FIG. 11A shows the dice as viewed from a direction perpendicular to each surface of the dice, and one gaze vector corresponds to each surface, and there are a total of six gaze vectors. FIG. 11B shows the dice seen from the direction in which the two faces of the dice can be seen. One sight line vector corresponds to each ridge line, and there are a total of 12 sight line vectors. FIG. 11C shows the dice as seen from the direction in which the three faces of the dice can be seen. One gaze vector corresponds to each vertex, and there are a total of eight gaze vectors. Therefore, the total of these line-of-sight vectors is 26.

  FIG. 12 shows an example of a line-of-sight vector for the three-dimensional shape 51 before the change shown in FIG. FIG. 12 shows a line-of-sight vector for the surface group 511 of the three-dimensional shape 51 before the change shown in FIG. In this example, line-of-sight vectors B1 to B6 perpendicular to each surface of the bounding box are shown as the line-of-sight vectors from the center point of the bounding box of the surface group 511. The line-of-sight vector B2, the line-of-sight vector B4, and the line-of-sight vector B6 intersect or interfere with surfaces other than the surface group 511, but the line-of-sight vector B1, the line-of-sight vector B3, and the line-of-sight vector B5 do not interfere with surfaces other than the surface group 511. . Therefore, the optimal line-of-sight vector is the sum vector of the line-of-sight vector B1, the line-of-sight vector B3, and the line-of-sight vector B5 with the smallest number of interferences.

  FIG. 13 shows line-of-sight vector information 93 representing the line-of-sight vector shown in FIG. When the three-dimensional coordinates are expressed by xyz coordinates, the line-of-sight vector name “B1” is a line-of-sight vector of (1.0, 0.0, 0.0). The line-of-sight vector name “B2” is a line-of-sight vector of (0.0, 1.0, 0.0). The line-of-sight vector name “B3” is a line-of-sight vector of (0.0, 0.0, 1.0). The line-of-sight vector name “B4” is a line-of-sight vector of (−1.0, 0.0, 0.0). The line-of-sight vector name “B5” is a line-of-sight vector of (0.0, −1.0, 0.0). The line-of-sight vector name “B6” is a line-of-sight vector of (0.0, 0.0, −1.0).

  FIG. 14 shows an example of a screen 60 displayed by the shape difference display unit 17 shown in FIG. This screen 60 is a screen displayed on the output device 9, for example. The shape difference display unit 17 enlarges and displays the shape of the target surface group and the shape of the corresponding surface group. On the screen 60 shown in FIG. 14, the bounding box 61 of the surface group of interest is displayed in a size that is not enlarged. Since this size is small and difficult to see, the shape difference display unit 17 enlarges the bounding box 61. The magnification to be enlarged is, for example, the maximum magnification that enters the screen when enlarged. For example, if the horizontal size W of the screen is 800 pixels, the vertical size H is 600 pixels, the horizontal size w of the bounding box 61 is 80 pixels, and the vertical size h is 50 pixels, the magnification is increased. The horizontal direction is W / w = 800/80 = 10 times, and the vertical direction is H / h = 600/50 = 12. Of the horizontal magnification and the vertical magnification, the smaller magnification, 10 in this example, is the magnification for enlarging the bounding box 61.

  FIG. 15 is a diagram in which the different surfaces in the three-dimensional shape before and after the change shown in FIG. 8 are emphasized. The surface of the surface group 511a shown in FIG. 15A has a different color from the surface of the surface group 511 shown in FIG. 8A, and is displayed separately from the surfaces other than the surface group 511a. Similarly, the surface of the surface group 521a shown in FIG. 15B is displayed in a different color from the surface of the surface group 521 shown in FIG. 8B, and is displayed separately from the surfaces other than the surface group 521a. .

  FIG. 16 shows a three-dimensional shape 53 to which a note indicating a difference in the three-dimensional shape 51 before the change shown in FIG. 15 is added. In the three-dimensional shape 53, a note “design change portion” 71 indicating a portion having a difference in shape before and after the change is added, and a portion having a difference, that is, a surface group having a difference is indicated by an arrow.

  FIG. 17 shows a three-dimensional shape 54 when the three-dimensional shape 53 shown in FIG. 16 is viewed from the optimum viewing direction. The optimum line-of-sight direction is the direction opposite to the direction of the optimum line-of-sight vector determined for each surface group by the optimum line-of-sight vector calculation unit 15. The three-dimensional shape 54 shown in FIG. 17 has an angle when the three-dimensional shape 53 shown in FIG. 16 is viewed from the optimum line-of-sight direction of the surface group indicated as the “design change portion” 71 in the three-dimensional shape 53. The shape rotated and output to the output device 9 is shown.

  FIG. 18 shows an image 62 displayed on the screen 60 by enlarging the shape of the surface group shown in FIG. The shape difference display unit 17 matches the center point of the bounding box of the surface group noted as “design change location” 71 shown in FIG. Is enlarged at the magnification obtained by the procedure described with reference to FIG. 14 and displayed on the screen 60 of the output device 9. Therefore, the image 62 is an image of a portion including the surface group noted as “design change portion” 71 in the image enlarged by the shape difference display unit 17.

  FIG. 19 shows an image 63 displayed on the screen 60 by enlarging the shape of the changed surface group corresponding to the surface group shown in the image 62 shown in FIG. First, the shape difference display unit 17 rotates the changed three-dimensional shape 52 shown in FIG. 15B to a shape seen from the optimum line-of-sight direction of the surface group shown in FIG. Further, after the rotation, the center point of the bounding box of the surface group 521 is made to coincide with the center position of the screen 60 of the output device 9, and the three-dimensional shape after the rotation is enlarged at the magnification obtained by the procedure described in FIG. And displayed on the screen 60 of the output device 9. Therefore, the image 63 is an image of a portion including the surface group 521 in the image enlarged by the shape difference display unit 17. In FIG. 19, the optimal viewing direction of the surface group 511 is used in order to view the same as the surface direction of the surface group 511 before the change as the optimal viewing direction. The optimal line-of-sight direction may be used.

  FIG. 20 is a flowchart processed by the design change display device 1 shown in FIG. This flowchart is processed by a central processing unit (not shown) included in the design change display device 1 executing a program stored in a storage unit (not shown). When information specifying two three-dimensional shapes to be compared, such as a model name before change and a model name after change, are input by an input device (not shown), the process proceeds to step A1.

  In step A1, pre-change model data is read. That is, the model data reading unit 11 reads out the three-dimensional CAD data of the model name before the change input by the input device from the model data storage device 8, and proceeds to step A2. The read three-dimensional CAD data is, for example, three-dimensional CAD data of the three-dimensional shape 51 shown in FIG. 8A, and the model name of the three-dimensional shape 51 is “model01.prt”, for example. In step A2, the changed model data is read. That is, the model data reading unit 11 reads from the model data storage device 8 the three-dimensional CAD data with the changed model name input by the input device, and proceeds to step A3. The read three-dimensional CAD data is, for example, three-dimensional CAD data of the three-dimensional shape 52 shown in FIG. 8B, and the model name of the three-dimensional shape 52 is, for example, “model02.prt”.

  In step A3, a shape difference surface is detected. That is, the shape-difference surface detection unit 12 detects a surface having no corresponding surface and a surface having a different shape from the corresponding surface based on the three-dimensional CAD data before the change and the three-dimensional CAD data after the change. Proceed to A4. For example, in the example shown in FIG. 8, for the three-dimensional CAD data of the model name “model01.prt” before the change, five surfaces a1 to a5 shown in FIG. 9A are detected and changed. For the later three-dimensional CAD data of the model name “model02.prt”, five surfaces b1 to b5 shown in FIG. 9B are detected.

  In Step A4, it is determined whether or not there is a shape difference surface. That is, when the surface having a difference between the three-dimensional CAD data before the change and the three-dimensional CAD data after the change is detected, the shape-difference surface detection unit 12 determines that there is a shape-difference surface, and proceeds to step A5 to change the surface. If a surface having a difference between the previous three-dimensional CAD data and the changed three-dimensional CAD data is not detected, it is determined that there is no shape difference surface, and the process is terminated. In the example shown in FIG. 8, since there is a shape difference surface, the process proceeds to step A5.

  In step A5, the shape difference surfaces are grouped. That is, the shape-difference surface grouping unit 13 first collects the surfaces detected in step A3 into a group of surfaces sharing the same edge. In other words, it is divided into surface groups consisting of adjacent surfaces. A surface that does not have an adjacent surface is a group consisting of only that surface. Next, for each divided surface group, generate a bounding box, and specify the maximum and minimum points for specifying the size of the generated bounding box, and the center point for specifying the position of the generated bounding box. calculate. The calculated maximum point, minimum point, and center point are stored in the shape difference group storage device 14 as the surface group information 92 together with the surface IDs of the surfaces constituting each surface group, and the process proceeds to step A6.

  In step A6, an optimal line-of-sight vector is calculated. That is, the line-of-sight vector interference frequency calculation unit 151 first determines the directions of a plurality of line-of-sight vectors determined in advance from the center point of each surface group for each surface group indicated by the surface group information 92 stored in the shape difference group storage device 14. The number of interferences with a surface that is the same three-dimensional shape as that of the vector extended to the surface and other than each surface group is calculated for each line-of-sight vector, and the calculated number of interferences for each line-of-sight vector is calculated for each surface group. This is stored in the vector interference number storage device 152. Next, the line-of-sight vector calculation unit 153 extracts the line-of-sight vector with the smallest number of interferences for each surface group from the number of interferences for each line-of-sight vector stored in the line-of-sight vector interference number storage device 152. For each surface group, when the number of extracted line-of-sight vectors is one, that single line-of-sight vector is determined as the optimum line-of-sight vector, and when the number of extracted line-of-sight vectors is two or more, the two or more line-of-sight vectors are determined. The sum is determined as the optimum line-of-sight vector, and the process proceeds to step A7.

  For example, in the surface group of the three-dimensional shape 51 before the change shown in FIG. 12, the number of interferences is calculated for six line-of-sight vectors, and the number of interferences is “0” as the line-of-sight vector with the smallest number of interferences. Three line-of-sight vectors of line-of-sight vector B1, line-of-sight vector B3, and line-of-sight vector B5 are extracted, and the sum of the three extracted line-of-sight vectors is determined as the optimum line-of-sight vector. The optimum line-of-sight vector is obtained from the line-of-sight vector information 93 shown in FIG. 13, the line-of-sight vector B1 (1.0, 0.0, 0.0), the line-of-sight vector B3 (0.0, 0.0, 1.0), And a vector (1.0, -1.0, 1.0) which is the sum of the line-of-sight vector B5 (0.0, -1.0, 0.0).

  In step A7, the enlargement magnification is calculated. That is, the shape difference display unit 17 reads the size of the bounding box of the surface group to be output, that is, the maximum point and the minimum point, from the surface group information 92 stored in the shape difference group storage device 14, and reads the size. The magnification for enlarging the bounding box from the size when projected onto the screen 60 of the output device 9, that is, the two-dimensional screen coordinate system is calculated for each surface group, and the process proceeds to step A8. The magnification to be enlarged is calculated, for example, according to the procedure described with reference to FIG.

  In step A8, it is determined whether there is still a shape difference surface group that is not displayed. If the shape difference display unit 17 determines that there is still a shape difference surface group that is not displayed, the process proceeds to step A9. If the shape difference display unit 17 determines that there is no shape difference surface group that is not displayed, the process ends.

  In step A9, the shape difference surface is highlighted. That is, when the surface of the surface information 91 stored in the shape difference group storage device 14 is displayed on the screen 60 of the output device 9, the shape difference display unit 17 distinguishes a surface having a difference from a surface having no difference. Then, the display is set to be highlighted or displayed in a different color, and the process proceeds to step A10. For the setting, for example, distinguishing information indicating that a highlight display or display with a different color should be performed is added to the surface information 91 and stored in the shape difference group storage device 14. In step A10, the annotation is set to be displayed. That is, the shape difference display unit 17 sets each surface group to display a note indicating that there is a design change, and proceeds to step A11. For example, note information indicating that a note “design change location” should be displayed is added to the surface information 91 and stored in the shape difference group storage device 14.

  In step A11, an overall view is displayed. That is, the shape difference display unit 17 rotates, for example, the entire three-dimensional shape before the change to a shape viewed from the opposite direction of the optimum line-of-sight vector determined in step A6 for one target surface group before the change. Display on the output device 9 and then proceed to Step A12. For example, the three-dimensional shape 54 shown in FIG. 17 is a shape obtained by viewing the entire three-dimensional shape before the change from the direction opposite to the optimum line-of-sight vector. The surface group that is the design change point is displayed without being blocked by other surfaces. At this time, if there is a surface to which the discrimination information is added to the surface information 91 stored in the shape difference group storage device 14, the surface is highlighted or displayed in a different color and stored in the shape difference group storage device 14. If there is a surface to which the note information is added to the surface information 91 to be displayed, a note such as a note “design change point” is displayed.

  In step A12, a detailed view of the pre-change model is displayed. That is, the shape difference display unit 17 fixes the overall shape of the three-dimensional shape before the change rotated in step A11, and fixes the center point of the one surface group before the change to be noticed, and calculates the surface group in step A7. Is enlarged and displayed on the output device 9, and the process proceeds to Step A13. For example, the image 62 shown in FIG. 18 has a shape when the surface group before the change is viewed from the opposite direction of the optimum line-of-sight vector. At this time, if there is distinction information, a highlight table or a different color is displayed, and if there is note information, a note such as a note “design change point” is displayed.

  In step A13, a detailed diagram of the changed model is displayed. That is, the shape difference display unit 17 rotates the entire three-dimensional shape after the change to a shape viewed from the opposite direction of the optimum line-of-sight vector in Step A11, and enlarges it at the same magnification as the magnification enlarged in Step A11. Of the enlarged overall shape, the shape of the surface group after the change corresponding to the surface group before the change displayed in step A12 is displayed on the output device 9, and the process returns to step A8. For example, the image 63 shown in FIG. 19 is a shape of the changed surface group viewed from the opposite direction of the optimal line-of-sight vector. At this time, if there is distinction information, a highlight table or a different color is displayed, and if there is note information, a note such as a note “design change point” is displayed.

  As described above, for example, the model data reading unit 11 that is an acquisition unit is used as a comparison target from the model data storage device 8 that is a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces. One of two two-dimensional shapes indicated by the three-dimensional CAD data acquired by the acquisition unit by, for example, the shape-difference surface detection unit 12 that is an extraction unit is acquired. The surface of the three-dimensional shape and the surface of another three-dimensional shape are compared with each other by the surface identification information, for example, the surface ID, for example. The identification information of both surfaces that do not match is extracted and the grouping means For example, the surface indicated by the surface identification information extracted by the extraction means by the shape difference surface grouping unit 13 is divided into a group composed of surfaces adjacent to each other, and there is no adjacent surface. Surfaces can be divided into groups consisting only of the surface.

  Further, the center of gravity of the three-dimensional group shape formed by the surface included in each group for each group divided by the grouping means by the optimum line-of-sight vector calculation unit 15 which is the optimum vector determining means, for example, is used as a base point. For example, an optimal line-of-sight vector satisfying a predetermined optimal condition is determined, and an output unit, for example, a shape difference display unit 17, which is a group divided by the grouping unit, for example, a surface group The target group shape of the group selected from among the group shapes, the three-dimensional shape that contains the target group shape, and the surface that forms the target group shape, if there is a target surface for comparison, includes the target surface for comparison Group Guru Is the shape viewed from the direction opposite to the direction of the optimal vector determined by the optimal vector determination means for the group shape of interest, and is output to the output device, for example, the output device 9. One of the two three-dimensional shapes and the corresponding two corresponding partial shapes can be output, for example, displayed from a direction suitable for viewing the difference. Therefore, the user can save the trouble of searching for a direction in which a portion having a difference in shape can be seen well, and can easily compare the difference between the two shapes.

  Further, the two three-dimensional shapes to be compared that are acquired by the model data reading unit 11 that is the acquisition means are the three-dimensional shape before the change and the three-dimensional shape after the change of the three-dimensional shape, and the output means For example, when the target group shape, the three-dimensional shape including the target group shape, and the surface forming the target group shape are compared with the target group shape by the shape difference display unit 17, the target surface to be compared The surface identification information extracted by, for example, the shape-difference surface detection unit 12 that is the extraction unit when the combined shape including the corresponding group shape that is a group shape is output to the output device 9 that is an output device, for example. Distinguish a surface from a surface other than the surface indicated by the extracted identification information Information indicating the position occupied by the group shape of interest in the three-dimensional shape containing the group shape of interest is added and output, and the group shape of interest and the corresponding group shape are enlarged and output. Therefore, with respect to the three-dimensional shape before and after the change, it is possible to easily find the changed part in the whole and the surface having a difference before and after the change and see the difference between the two shapes in detail. Therefore, the contents of the design change can be reliably grasped.

  Furthermore, the optimal condition that is determined in advance is that each of the groups, for example, a plurality of predetermined vectors based on the center of gravity position of the group shape of the surface group, for example, each of the line-of-sight vectors includes a three-dimensional shape that includes each group shape. The number of intersecting surfaces, which is the number of surfaces that intersect the surfaces excluding the surface of each group shape, for example, the number of interferences. This is a condition that the number of faces is a vector, and when there are two or more vectors with the smallest number of intersecting faces, the condition is that the vector is the sum of the vectors with the smallest number of intersecting faces. It can be seen from the direction that is least likely to be done. Therefore, the difference before and after the change can be grasped more reliably.

  FIG. 21 shows the configuration of the design change display apparatus 2 according to the second embodiment of the present invention and the related apparatus. The design change display device 2 which is a design support device includes a model data reading unit 21, a shape difference surface detection unit 22, a shape difference surface grouping unit 23, a shape difference group storage device 24, an optimum line-of-sight vector calculation unit 25, and a shape difference surface enhancement. It includes a display unit 26, a shape difference display unit 27, an image capture unit 28, an image storage device 29, a document creation unit 30, and a document storage device 31, and is connected to the model data storage device 8, the output device 9, and an input device (not shown). Is done.

  Similar to the design change display device 1 shown in FIG. 1, the design change display device 2 includes a central processing device (not shown) and a storage device (not shown), and the central processing device executes a program stored in the storage device. Model data reading unit 21, shape difference surface detection unit 22, shape difference surface grouping unit 23, optimum line-of-sight vector calculation unit 25, shape difference surface enhancement display unit 26, shape difference display unit 27, image capture unit 28, and document Each function such as the creation unit 30 is realized. The model data storage device 8, the output device 9, and the input device (not shown) are the same devices as those shown in FIG. The design support method is a method processed by the design change display device 2 by executing a program stored in a storage device (not shown).

  The model data reading unit 21, the shape difference surface detection unit 22, the shape difference surface grouping unit 23, the shape difference group storage device 24, the optimum line-of-sight vector calculation unit 25, the shape difference surface enhancement display unit 26, and the shape difference display unit 27 are: The model data reading unit 11, the shape difference surface detection unit 12, the shape difference surface grouping unit 13, the shape difference group storage device 14, the optimum line-of-sight vector calculation unit 15, the shape difference surface enhancement display unit 16, and the shape shown in FIG. This is the same as the difference display unit 17, and a description thereof is omitted to avoid duplication.

  The image capture unit 28 displays the image displayed on the screen 60 of the output device 9 by the shape difference display unit 27, for example, the image of the entire three-dimensional shape shown in FIG. 17, the shape of the surface group before change shown in FIG. And an image obtained by enlarging the shape of the surface group after the change shown in FIG. 19 are captured or acquired, and the captured image is stored or stored in the storage device 29. The image storage device 29 stores the image captured by the image capture unit 28.

  The document creation unit 30 stores the image stored in the image storage device 29, for example, the entire shape image shown in FIG. 17, the enlarged image of the shape of the surface group before change shown in FIG. 18, and the image shown in FIG. An image obtained by enlarging the shape of the surface group after the change is pasted into a format of a document stored in the document storage device 31, for example, a format 80 of a design change report described later with reference to FIG. The created document is stored, that is, stored in the document storage device 31. The document storage device 31 stores the document format and the document created by the document creation unit 30 as document information. The image storage device 29 and the document storage device 31 may be included in a storage device (not shown), or may be configured as a storage device including, for example, a hard disk device different from the storage device (not shown).

  FIG. 22 shows an example of the format 80 of the design change correspondence stored in the document storage device 31 shown in FIG. The design change report format 80 includes “design change report” in the title field, “/” in the sheet number field, “creation date:” in the creation date field, and “creator: "And the model name:" are written in advance in the model name entry field.

  FIG. 23 shows an example of the design change report 81 created by the document creation unit 30 shown in FIG. In the design change report 81, “creation date: January 29, 2006” is entered in the creation date entry field, “creator: Taro Yamada” is entered in the creator name entry field, and “model name: Top” is entered in the model name entry field. .Prt ”and one of the three-dimensional shape surface groups whose model name is“ Top.prt ”, an overall view 54a of the three-dimensional shape, an enlarged view 62a before the change, and an enlarged view 63a after the change are displayed. It is shown. An overall view 54a is an image obtained by capturing the three-dimensional shape 54 shown in FIG. 17, and an enlarged view 62a before change is an image obtained by capturing the image 62 of the surface group before change shown in FIG. The enlarged view 63a is an image obtained by capturing the surface group image 63 after the change shown in FIG.

  FIG. 24 is a flowchart processed by the design change display device 2 shown in FIG. This flowchart is processed by a central processing unit (not shown) included in the design change display device 2 executing a program stored in a storage unit (not shown). When information for identifying two three-dimensional shapes to be compared, such as a model name before change and a model name after change, are input by an input device (not shown), the process proceeds to step B1. Step B1 to Step B7 and Step B9 to Step B11 perform the same processing as Step A1 to Step A7 and Step A9 to Step A11 shown in FIG. 20, respectively, and therefore description thereof is omitted to avoid duplication.

  In step B8, it is determined whether there is still a shape difference surface group that is not displayed. If the shape difference display unit 27 determines that there is still a shape difference surface group that is not displayed, the process proceeds to step B9. If the shape difference display unit 27 determines that there is no shape difference surface group that is not displayed, the process proceeds to step B17.

  In step B12, the entire diagram is captured. That is, the image capture unit 28 captures an image of the entire three-dimensional shape before change displayed on the output device 9 in step B11, for example, an image of the entire shape shown in FIG. Proceed to step B13.

  In step B13, a detailed diagram of the pre-change model is displayed. In other words, the shape difference display unit 27 fixes the overall shape of the three-dimensional shape before the change rotated in Step B11, and fixes the center point of the one surface group before the change to be noticed. The image is enlarged at the magnification obtained by calculation and displayed on the output device 9, and the process proceeds to step B14. At this time, if there is distinction information, highlight display or display in a different color is performed, and if there is note information, a note such as a note “design change point” is displayed. In step B14, a detailed view of the pre-change model is captured. That is, the image capture unit 28 captures an enlarged shape of the surface group before change displayed on the output device 9 in step B13, for example, an image 62 obtained by enlarging the shape of the surface group before change shown in FIG. The data is stored in the storage device 29, and the process proceeds to Step B15.

  In step B15, a detailed view of the changed model is displayed. That is, the shape difference display unit 27 rotates the entire three-dimensional shape after the change to a shape viewed from the opposite direction of the optimum line-of-sight vector in Step B11, and enlarges at the same magnification as the magnification enlarged in Step B11. Then, of the enlarged overall shape, the shape of the surface group after the change corresponding to the surface group before the change displayed in step B13 is displayed on the output device 9, and the process proceeds to step B16. At this time, if there is distinction information, a highlight table or a different color is displayed, and if there is note information, a note such as a note “design change point” is displayed. In step B16, a detailed view of the post-change model is captured. That is, the image capture unit 28 captures an enlarged shape of the changed surface group displayed on the output device 9 in step B15, for example, an image 63 obtained by enlarging the changed shape of the surface group shown in FIG. The data is stored in the storage device 29 and the process proceeds to step B17.

  In step B17, a document is created. That is, the document creation unit 30 first reads out the document stored in the document storage device 31, for example, the format 80 of the design change report. Next, the entire design image stored in the image storage device 29, the image obtained by enlarging the shape of the surface group before the change, and the shape of the surface group after the change are enlarged in the format 80 of the read design change report. The image is pasted, and the design change report 81 with the image pasted is stored in the image storage device 29, and the process ends. The design change notification 81 stored in the image storage device 29 can be output to the output device 9.

  As described above, the target group shape output to the output device 9 such as the output device 9 by the image capturing unit 28 which is the image capturing unit and the output device 9 such as the shape difference display unit 27 which is the output unit, and the target group shape are included. The three-dimensional shape and the corresponding group shape are captured as an image, and a document in a predetermined format is generated for each group by using, for example, the document creation unit 30 serving as a document generation unit, using the image captured by the image capture unit. Then, the document information representing the generated document is stored in the storage means, for example, the document storage device 31, and the document information stored in the storage means is output to the output device by the output means. Information automatically It is possible to document reduction. Therefore, it is possible to reduce the time and effort of the designer for creating the document, and it is possible to provide information on how the shape is different before and after the change as a document to related parties other than the designer.

  FIG. 25 shows a part of the configuration of the design change display device 3 according to the third embodiment of the present invention. The design change display device 3 which is a design support device includes a model data reading unit 21, a shape difference surface detection unit 22, a shape difference surface grouping unit 33, a shape difference group storage device 34, an optimum line-of-sight vector calculation unit 25, and a shape difference surface enhancement. Display unit 26, shape difference display unit 27, image capture unit 28, image storage device 29, document creation unit 30, document storage device 31, surface change history display unit 336, surface change history description unit 337, difference dimension display unit 338, The model data storage device 8, the output device 9, and an input device (not shown). Further, the shape difference surface grouping unit 33 includes a surface change history determination unit 331, a change surface search unit 332, a dimension information acquisition unit 333, a dimension information comparison unit 334, and a difference dimension storage unit 335.

  Model data reading unit 21, shape difference surface detection unit 22, optimum line-of-sight vector calculation unit 25, shape difference surface enhancement display unit 26, shape difference display unit 27, image capture unit 28, image storage device 29, document creation unit 30, document The storage device 31 and the output device 9 are the same as the parts denoted by the same reference numerals shown in FIG. 20, and are not shown in FIG. The shape difference group storage device 34 is the same as the shape difference group storage device 24 shown in FIG. The model data storage device 8 and an input device (not shown) are the same devices as those described in FIG. These are not described in order to avoid duplication.

  Similarly to the design change display device 2 shown in FIG. 21, the design change display device 3 includes a central processing device (not shown) and a storage device (not shown), and the central processing device executes a program stored in the storage device. The model data reading unit 21, the shape difference surface detection unit 22, the shape difference surface grouping unit 33, the optimum line-of-sight vector calculation unit 25, the shape difference surface enhancement display unit 26, the shape difference display unit 27, the image capture unit 28, and the document creation Each function of the unit 30, the surface change history display unit 336, the surface change history description unit 337, the difference dimension display unit 338, the difference dimension description unit 339, and the like is realized. The design support method is a method processed by the design change display device 3 by executing a program stored in a storage device (not shown).

  The surface change history determination unit 331 compares the surfaces before and after the change, determines the change mode of each changed surface, and stores the determination result in the shape difference group storage device 34. There are three modes of change: “add”, “delete”, and “change”. Specifically, the surface group information 92 stored in the shape difference group storage device 34 is stored for each three-dimensional shape, and the surface change history determination unit 331 stores the surface ID in the surface group information 92 before the change. If it does not exist and exists in the surface group information 92 after the change, the change mode of the surface with the surface ID is determined as “added”. If the surface ID exists in the surface group information 92 before the change and does not exist in the surface group information 92 after the change, the surface change mode of the surface ID is determined as “erasure”. Furthermore, if the surface ID exists in the surface group information 92 before the change and the surface group information 92 after the change, the surface change mode of the surface ID is determined as “change”. The determination result is added as change mode information in the “surface change history” column of the surface group information 94 described later with reference to FIG. The surface group information 94 is obtained by adding a “surface change history” column to the surface group information 92 stored in the shape difference group storage device 34.

  The changed surface search unit 332 searches the surface group information 94 stored in the shape difference group storage device 34 for the surface before change and the surface after change whose change mode is “change”.

  The dimension information acquisition unit 333 acquires dimension information about the surface before and after the change searched by the changed surface search unit 332 from the model data storage device 8. The dimension information is information on the dimensions of each side forming the periphery of each surface. For example, the dimension ID for identifying each side, the dimension value of each side, and the type of dimension such as linear, radius, diameter, angle, etc. , And the tolerance value of the dimension and the like are associated with each dimension ID, and are stored in the model data storage device 8.

  The dimension information comparison unit 334 compares the dimension value, the dimension type, and the tolerance value for each dimension ID with respect to the dimension information of the surface before and after the change acquired from the model data storage device 8 by the dimension information acquisition unit 333, The dimension information of the dimension ID that at least one of these is different is extracted. The difference dimension storage unit 335 associates the dimension ID included in the dimension information extracted by the dimension information comparison unit 334, the dimension value before and after the change, the dimension type, and the tolerance value with each surface, and will be described later with reference to FIG. The dimension change information 95 is stored, that is, stored in the shape difference group storage device 34.

  The surface change history display unit 336 first determines whether the change mode determination result determined by the surface change history determination unit 331, that is, whether the change mode is “addition”, “erase”, or “change”. The change mode information shown is read from the “surface change history” column included in the surface group information 94 stored in the shape difference group storage device 34. Next, the read change mode information is displayed as a dialog box on the screen on which the overall shape of each surface group and the enlarged shape of the surface group before and after the change are displayed by the shape difference display unit 27, or within the same screen. The message is displayed in the message area of the displayed three-dimensional CAD system.

  The surface change history description unit 337 reads the change mode information determined by the surface change history determination unit 331 from the “surface change history” column included in the surface group information 94 stored in the shape difference group storage device 34. Next, the read change mode information is described in addition to a document created by the document creation unit 30, such as a design change report.

  The difference dimension display unit 338 displays the entire shape of each surface group displayed by the shape difference display unit 27 and the enlarged shape of the surface group before and after the change in the dimension change information 95 stored in the shape difference group storage device 34. Add and display the dimension values before and after the change included. The difference dimension description unit 339 adds the dimension values before and after the change included in the dimension change information 95 stored in the shape difference group storage device 34 to the document created by the document creation unit 30, for example, the design change report. To do.

  FIG. 26 shows an example of the surface group information 94 stored in the shape difference group storage device 34 shown in FIG. The surface group information 94 is information obtained by adding a “surface change history” column indicating a change mode for each surface ID to the surface group information 92 shown in FIG. 7, and is stored in the shape difference group storage device 34. In FIG. The surface group of “1” is shown, the surface IDs are “3345” to “3349”, and the size of the shape difference group is “(100.0, 200.0, 50.0), (500. 0, 600.0, 450.0) ”and the center point of the shape difference group is“ (300.0, 400.0, 250.0) ”. The surface change history is shown for each of the surface ID “3345” to the surface ID “3349”, and all of them are “change”.

  FIG. 27 shows an example of the dimension change information 95 stored in the shape difference group storage device 34 shown in FIG. The dimension change information 95 is information in which a surface name, a surface ID, a dimension ID (referred to as “changed dimension ID” in FIG. 27), a dimension value, a dimension type, and a tolerance are associated with each other. Remembered. In FIG. 27, for the surface name “surface S11”, the surface ID is “3345”, the changed dimension ID is “26789” above, the changed dimension ID is below “26790”, and the dimension value is above “60 => 100”. ”,“ 60 => 120 ”at the bottom of the dimension value,“ Linear ”at the top of the dimension type,“ Linear ”at the bottom of the dimension type,“ ± 0.1 ”at the top of the tolerance value,“ ± 0.1 ". Regarding the dimension value, the number on the left side of the arrow (=>) is the dimension value before the change, and the number on the right side of the arrow is the dimension value after the change. In this case, for the surface with the surface ID “3345”, the edges having a difference in the dimension information before and after the change are two edges with the dimension ID “26789” and the dimension ID “26790”, and are described separately in the upper stage and the lower stage. Has been.

  Similarly, for the surface name “surface S12”, the surface ID is “3346”, the upper dimension ID is “26793”, the lower dimension ID is “26794”, the upper dimension dimension is “60 => 80”, “60 => 120” at the bottom of the dimension value, “Linear” at the top of the dimension type, “Linear” at the bottom of the dimension type, “± 0.1” at the top of the tolerance value, “± 0” at the bottom of the tolerance value .1 ". For the surface name “surface S13”, the surface ID is “3347”, the upper part of the changed dimension ID is “26797”, the lower part of the changed dimension ID is “26798”, the upper part of the dimension value is “60 => 80”, “60 => 100” at the bottom, “Linear” at the top of the dimension type, “Linear” at the bottom of the dimension type, “± 0.2” at the top of the tolerance value, “± 0.2” at the bottom of the tolerance value It is indicated. For the surface name “Surface S14”, the surface ID is “3348”, the upper dimension ID is “26800”, the lower dimension ID is “26801”, the upper dimension dimension is “60 => 100”, the dimension value “60 => 120” at the bottom, “Linear” at the top of the dimension type, “Linear” at the bottom of the dimension type, “± 0.1” at the top of the tolerance value, “± 0.1” at the bottom of the tolerance value It is indicated. For the surface name “Surface S15”, the surface ID is “3349”, the upper dimension of the changed dimension ID is “26804”, the lower dimension of the changed dimension ID is “26805”, the upper dimension of the dimension value is “60 => 80”, “60 => 120” at the bottom, “Linear” at the top of the dimension type, “Linear” at the bottom of the dimension type, “± 0.1” at the top of the tolerance value, “± 0.1” at the bottom of the tolerance value It is indicated.

  FIG. 28 shows an image 64 obtained by adding the changed contents to the image 63 shown in FIG. The change contents include a dialog box indicating the change mode, for example, a surface change history 72 and dimension values 73 before and after the change. The surface change history 72 is a dialog box displaying a title “surface change history”, a character string “change” indicating that the change mode is change, and an “OK” button for instructing confirmation. The dimension value 73a before and after the change indicates that the dimension value before the change is “60” and the dimension value after the change is “100”. The dimension values before the change are enclosed in parentheses. Similarly, the dimension value 73b before and after the change is “50” before the change and “80” after the change. The dimension value 73c before and after the change is “60” before the change and “120” after the change.

  FIG. 29 shows a design change report 82 in which the change contents are added to the design change report 81 shown in FIG. In the design change report 82, a dialog box for the history of surface change is added to each of the overall view, the enlarged view before change, and the enlarged view after change shown in FIG. Further, the surface ID, the changed dimension ID, and the dimension value in the dimension change information 95 are added to the overall view, and the dimension value before the change is added to the enlarged view before the change, and the enlarged view 64a after the change is added. The dimension values before and after the change are added. The post-change enlarged view 64a is an image obtained by capturing the image 64 shown in FIG.

  Thus, the three-dimensional CAD data stored by the model data storage device 8 which is a storage device includes, for example, the surface ID which is the surface identification information for each surface of each three-dimensional shape, and is a determination means such as a surface change. If each surface identification information extracted by the history determination unit 331, for example, by the shape difference surface detection unit 22 which is an extraction means is included in the three-dimensional data before the change and is not included in the three-dimensional data after the change, The surface change mode indicated by the surface identification information is determined to be erasure, and if it is not included in the 3D data before the change and is included in the 3D data after the change, the surface change mode indicated by the surface identification information is added. Included in the three-dimensional data before and after the change Then, it is determined that the change mode of the surface indicated by the surface identification information is a change, and the surface identification information extracted by the extraction unit by the surface change history determination unit 331, which is a change history unit, and the determination unit Since the change mode information indicating the change mode determined for the surface is associated with each other and stored by, for example, the shape difference group storage device 34, which is a storage unit, it is added, deleted, or deleted for each portion having a difference before and after the change, or The change mode information indicating the type of change can be stored in the storage means. Therefore, the user can roughly grasp the contents of the design change by referring to the change mode information stored in the storage unit.

  Further, for example, the model data storage device 8 which is a storage device is dimensional information on the dimensions of each side forming the periphery of each surface of the three-dimensional shape before and after the change, and identifies each dimension. Dimension information including, for example, dimension ID, which is dimension identification information for the purpose of storing, is stored for each surface ID, for example, surface identification information, and dimension information for each surface identification information is stored by, for example, a dimension information acquisition unit 333 which is an acquisition means. Corresponding to the change mode information whose change mode is a change from the surface identification information acquired from the apparatus and stored in, for example, the shape difference group storage unit 34 as the storage unit, by the change surface search unit 332 that is a search unit. The surface identification information obtained is retrieved, and dimension information extraction means, for example, dimension information From the dimension information including the surface identification information searched by the search means among the dimension information acquired by the comparison means 334 and the difference dimension storage section 335, the dimension information before the change and the dimension information after the change Dimension information with a difference is extracted in, and the extracted dimension information is associated with the surface identification information and stored as dimensional change information by the storage means. Therefore, the dimension information before and after the change for each dimension having a difference before and after the change. Can be stored in the storage means. Therefore, the user can grasp the detailed design change contents by referring to the dimension information stored in the storage means.

  Furthermore, when the combination shape is output to the output device 9 such as the output device by the shape difference display unit 27 which is the output means, the change mode stored by the shape difference group storage device 34 which is the storage means, for example. Among the information, for example, the change mode information associated with the surface ID that is the surface identification information of the surface included in the group shape of interest is added and output. Or, it can be displayed on a screen or the like indicating the change. Therefore, the user can roughly grasp the contents of the design change from the screen or the like.

  Further, when a document in a predetermined format is generated by, for example, the document creation unit 30 that is a document generation unit, among the change mode information stored by, for example, the shape difference group storage device 34 that is a storage unit, the attention group shape is selected. Since it is generated by adding the change mode information associated with the surface ID that is the surface identification information of the included surface, for example, a document showing the difference between addition, deletion, or change in the difference between before and after the change Can be. Therefore, the parties concerned can roughly grasp the contents of the design change from the document.

  Furthermore, when the combination shape is output to the output device 9 such as the output device by the shape difference display unit 27 that is the output means, the size change stored by the shape difference group storage device 34 that is the storage means, for example. Of the information, the dimension change information associated with the surface ID, for example, the surface identification information of the surface included in the group shape of interest is added and output. Can be displayed on the screen. Therefore, the user can grasp the detailed design change contents from the screen or the like.

  Further, when a document in a predetermined format is generated by, for example, the document creation unit 30 that is a document generation unit, among the dimension change information stored by, for example, the shape difference group storage device 34 that is a storage unit, the attention group shape is selected. Since it is generated by adding dimension change information corresponding to the surface ID, which is the surface identification information of the included surface, for example, it is possible to make a document showing the dimensions before and after the change in the difference between before and after the change. it can. Therefore, the concerned person can grasp the detailed design change contents from the document.

  Furthermore, the design support method is a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces, for example, in an acquisition process processed by the model data reading unit 11, for example, model data storage Two-dimensional CAD data of two three-dimensional shapes to be compared are acquired from the apparatus 8, and the 2D indicated by the three-dimensional CAD data acquired in the acquisition step is an extraction step processed by the shape difference surface detection unit 12, for example. One of the three-dimensional shapes and the surface of the other three-dimensional shape and the surface of the other three-dimensional shape are compared with each other by, for example, the surface ID, which is the surface identification information, and the identification information of the surface not to be compared And the identification information for both surfaces whose shapes do not match. For example, in the grouping process processed by the shape-difference surface grouping unit 13, the surface indicated by the surface identification information extracted in the extraction process is changed into a group composed of surfaces adjacent to each other. Divide surfaces that do not have adjacent surfaces into groups consisting of only those surfaces.

  Further, for example, in the optimum vector determination process processed by the optimum line-of-sight vector calculation unit 15, for each group divided in the grouping process, the barycentric position of the three-dimensional group shape formed by the surface included in each group is determined. For example, an optimal line-of-sight vector that is a vector that is a base point and that satisfies an optimal condition that satisfies a predetermined optimal condition is determined. For example, in the output process that is processed by the shape difference display unit 17, groups of groups divided by the grouping process The target group shape of the group selected from the shapes, the three-dimensional shape that contains the target group shape, and the surface that forms the target group shape, if there is a target surface for comparison, the group that includes the target surface for comparison Group shape and the optimal vector determination process A shape viewed from the direction opposite to the direction of the optimum vector determined for the group shape of interest is output to an output device, for example, the output device 9, so that one of two three-dimensional shapes can be obtained without any user operation. A three-dimensional shape and two corresponding partial shapes having a difference can be output, for example, displayed from a direction suitable for viewing the difference portion. Therefore, the user can save the trouble of searching for a direction in which a portion having a difference in shape can be seen well, and can easily compare the difference between the two shapes.

  FIG. 30 shows the configuration of the design change display device 4 according to the fourth embodiment of the present invention and the related devices. The design change display device 4 which is a design support device includes a model data reading unit 21, a shape difference surface detection unit 22, a shape difference surface grouping unit 23, a shape difference group storage device 24, an optimum line-of-sight vector calculation unit 25, and a shape difference surface enhancement. It includes a display unit 26, a shape difference display unit 37, an image capture unit 28, an image storage device 29, a document creation unit 30, and a document storage device 31, and is connected to the model data storage device 8, the output device 9, and an input device (not shown). Is done. Parts other than the shape difference display unit 37 are denoted by the same reference numerals as those shown in FIG. 21 to indicate the same parts, and the description thereof is omitted to avoid duplication.

  The shape difference display unit 37 includes a viewpoint / magnification changing unit 371, a viewpoint / magnification storage unit 372, a pre-change viewpoint / magnification storage device 373, and a post-change viewpoint / magnification change unit 374. The viewpoint / magnification changing unit 371 uses the optimum line-of-sight vector determined by the optimum line-of-sight vector calculation unit 25 for the shape of each shape-difference surface group of the CAD data before the change so that the shape of the shape-difference surface group can be seen on the full screen. After the enlarged display, the CAD system function is used to convert the shape of the shape-difference surface group before the change into CAD data that has been moved, rotated, or enlarged / reduced. The movement / rotation / enlargement / reduction information is input, for example, by an input device (not shown) as movement amount information representing the movement amount, rotation angle information representing the rotation angle, and magnification information representing the enlargement / reduction magnification.

  The viewpoint / magnification storage unit 372 includes a reference position / angle / amount of movement from the magnification / rotation angle / magnification magnification when the CAD data converted by the viewpoint / magnification changing unit 371 is moved / rotated / enlarged / reduced. It is expressed in a 4 × 4 transformation matrix and stored in the pre-change viewpoint / magnification storage device 373. The reference position / angle / magnification is the position / angle / magnification when the default position display function which is a function of the CAD system is used.

  FIG. 31 shows an example of a 4 × 4 transformation matrix used by the viewpoint / magnification storage unit 372 shown in FIG. The 4 × 4 conversion matrix includes a conversion matrix of movement, enlargement / reduction, X-axis rotation, Y-axis rotation, and Z-axis rotation. The transformation matrix shown in FIG. 31 (a) is a transformation matrix for movement. The first row is “1, 0, 0, 0”, the second row is “0, 1, 0, 0”, the third row. Is “0, 0, 1, 0”, and the fourth line is “dx, dy, dz, 1”. The transformation matrix shown in FIG. 31B is a scaling transformation matrix. The first row is “sx, 0, 0, 0”, the second row is “0, sy, 0, 0”, and the third row. The eyes are “0, 0, sz, 0”, and the fourth line is “0, 0, 0, 1”. The transformation matrix shown in FIG. 31C is a transformation matrix for X-axis rotation, where the first row is “1, 0, 0, 0”, the second row is “0, cos θ, sin θ, 0”, 3 The line is “0, −sin θ, cos θ, 0”, and the fourth line is “0, 0, 0, 1”. The transformation matrix shown in FIG. 31D is a transformation matrix for Y-axis rotation, the first line is “cos θ, sin θ, 0, 0”, the second line is “−sin θ, cos θ, 0, 0”, The third line is “0, 0, 1, 0” and the fourth line is “0, 0, 0, 1”. The transformation matrix shown in FIG. 31 (e) is a transformation matrix for Z-axis rotation, where the first row is “1, 0, 0, 0”, the second row is “0, cos θ, sin θ, 0”, 3 The line is “0, −sin θ, cos θ, 0”, and the fourth line is “0, 0, 0, 1”.

  FIG. 32 shows an example of a transformation determinant used by the viewpoint / magnification storage unit 372 shown in FIG. The example shown in FIG. 32 is a transformation matrix when rotated about the X axis by θ ° and moved by the distance indicated by coordinates (dx, dy, dz), and moved from the right to the transformation matrix of the X axis rotation. The matrix multiplied by the transformation matrix.

  The pre-change viewpoint / magnification storage device 373 stores the movement amount / rotation angle / enlargement / reduction ratio expressed in the 4 × 4 conversion matrix by the viewpoint / magnification storage unit 372. The pre-change viewpoint / magnification storage device 373 may be included in a storage device (not shown), or may be configured by a hard disk device, for example, different from the storage device (not shown).

  The post-change viewpoint / magnification change unit 374 displays the pre-change viewpoint / magnification storage device for the CAD data of each shape-difference surface group after the change when displaying the shape of each shape-difference surface group of the CAD data before the change. By performing movement / rotation / enlargement / reduction operations based on the transformation matrix stored in 373, the same line-of-sight vector as when displaying the shape of each shape-difference surface group before change, and the same movement / rotation / enlargement / reduction Display with magnification.

  FIG. 33 shows an example of a shape in which the viewpoint / magnification changing unit 371 shown in FIG. 30 has moved, rotated, and enlarged / reduced. The figure shown on the left is the shape before the movement / rotation / enlargement / reduction, and the figure shown on the right is the shape after the movement / rotation / enlargement / reduction. The shape on the right side is moved closer to the center of the figure than the shape on the left side, the inclination to the left is increased, and the size is reduced and displayed.

  FIG. 34 is an example in which the shape after change corresponding to the shape before change shown in FIG. 33 is shown from the same direction. The shape before change shown on the left side is the same as the shape on the right side shown in FIG. The shape on the right side is the shape after change corresponding to the shape before change shown on the left side, and is displayed in the same viewpoint vector direction as before the change and subjected to the same movement, rotation, and enlargement / reduction.

  FIG. 35 is a flowchart processed by the design change display device 4 shown in FIG. This flowchart is processed by a central processing unit (not shown) included in the design change display device 4 executing a program stored in a storage unit (not shown). When information specifying two three-dimensional shapes to be compared, such as a model name before change and a model name after change, are input by an input device (not shown), the process proceeds to step C1. Steps C1 to C13 and C19 perform the same processing as Steps B1 to B13 and Step B17 shown in FIG. 24, respectively, and thus description thereof is omitted to avoid duplication.

  In step C14, the viewpoint / magnification changing unit 371 displays the CAD data of each shape difference surface group before change by moving, rotating, and enlarging / reducing using the functions of the CAD system, and then proceeds to step C15. . For example, movement, rotation, and enlargement / reduction are performed as shown in FIG. In step C15, the image capture unit 28 captures an enlarged view of the pre-change model displayed in step C14, stores it in the image storage device 29, stores it, and proceeds to step C16. In step C16, the viewpoint / magnification storage unit 372 changes the amount of movement from the reference position / angle / magnification, the rotation angle, and the magnification / reduction ratio captured in step C15 to a 4 × 4 conversion matrix and changes the expression. The information is stored in the previous viewpoint / magnification storage device 373, and the process proceeds to Step C17.

  In step C17, the post-change viewpoint / magnification changing unit 374, based on the transformation matrix stored in the pre-change viewpoint / magnification storage device 373 in step C16, the shape of each shape difference surface group of the CAD data after the change, The display is moved / rotated / enlarged / reduced and the process proceeds to Step C18. For example, as shown in FIG. 34, the same line-of-sight vector and the same movement amount / rotation angle / magnification as when the pre-change image was captured are displayed. In step C18, the image capture unit 28 captures the enlarged view of the post-change model displayed in step C17, stores or stores it in the image storage device 29, and proceeds to step C8.

  In this way, movement amount information representing the movement amount, rotation angle information representing the rotation angle, and magnification information representing the enlargement / reduction magnification are input by an input device (not shown) which is an input means, for example, a shape difference which is an output means. When the display unit 37 includes a target group shape and the surface forming the target group shape includes a comparison target surface, the group shape of the group including the comparison target surface is input by the input unit. Since it is moved by the amount of movement indicated by the information, rotated by the rotation angle indicated by the rotation angle information input by the input means, and further enlarged or reduced by the magnification indicated by the magnification information input by the input means, it is output. The group shape and the group shape to be compared can be moved, rotated and scaled for output. Kill. Therefore, the user can view in an easier-to-view manner.

  FIG. 36 shows the configuration of the design change display device 5 according to the fifth embodiment of the present invention and the related devices. The design change display device 5 which is a design support device includes a model data reading unit 11, a shape difference surface detection unit 12, a shape difference surface grouping unit 33, a shape difference group storage device 14, an optimum line-of-sight vector calculation unit 15, and a shape difference surface enhancement. The display unit 16 and the shape difference display unit 17 are included, and are connected to the model data storage device 8, the output device 9, and an input device (not shown). The shape difference surface grouping unit 33 includes a surface change history determination unit 331. Parts other than the shape difference surface grouping unit 33 and the surface change history determination unit 331 are denoted by the same reference numerals as the parts shown in FIG. The surface change history determination unit 331 attaches the same reference numerals as those shown in FIG. 25 to indicate the same parts.

  The optimum line-of-sight vector 15 of the design change display device 5 is the shape difference between the CAD data before change and the CAD data after change for the shape difference surface group including the surface whose change mode is determined to be changed by the surface change history determination unit 331. Calculate the optimal line-of-sight vector where both shapes of the surface group are visible. Specifically, first, for each of the shape difference surface group before the change and the shape difference surface group after the change, as shown in FIG. 12, the surface of each shape difference surface group is excluded from the surface of the model shape. A vector having the smallest number of times of interference with the surface is obtained as a line-of-sight vector candidate. The model shape is the entire three-dimensional shape including the shape difference surface group. Next, the obtained sight vector candidates before and after the change are compared to obtain a common sight vector, that is, a sight vector in the same direction, and when the number of the common sight vectors is one, Is the optimal line-of-sight vector, and when there are a plurality of common line-of-sight vectors, the vector obtained by adding the plurality of line-of-sight vectors is the optimal line-of-sight vector. For example, when the line-of-sight vector candidates before the change are the line-of-sight vector B2, the line-of-sight vector B3, and the line-of-sight vector B5, and the line-of-sight vector candidates after the change are the line-of-sight vector B3, the line-of-sight vector B4, and the line-of-sight vector B6, The line-of-sight vector B3, which is the line-of-sight vector, is the optimum line-of-sight vector.

  The shape difference display unit 17 changes the shape of each shape difference surface group stored in the shape difference surface group storage device 14 to the highlight or surface color set by the shape difference surface emphasis display unit 16, and each shape. 3D CAD data is displayed across the screen, using the 3D CAD function to add arrows and notes to each shape difference surface group to indicate where the differential surface group is in the entire CAD model Display the overall diagram. After that, with the optimal line-of-sight vector determined by the optimal line-of-sight vector calculation unit 15, an enlargement magnification at which both the shape difference surface group shape of the pre-change CAD data and the post-change CAD data fits on the screen and is enlarged and displayed on the full screen is displayed. An enlarged view in which the shape of each shape difference surface group of the CAD data before and after the change is enlarged is displayed on the output device 9 with the calculated enlargement magnification. As the enlargement magnification, for example, a rectangular parallelepiped surrounding the shape of the shape difference surface group before and after the change, for example, a bounding box is obtained, and an enlargement magnification at which the rectangular parallelepiped is displayed on the full screen is obtained.

  FIG. 37 shows an example of the shape before and after the change output by the design change display device 5 shown in FIG. FIG. 37A shows the shape of the shape-difference surface group before the change. FIG. 37 (b) shows the shape of the shape-difference surface group after the change, which is in a position different from the position before the change, but the overall shape of each shape-difference surface group is greatly displayed both before and after the change. ing.

  As described above, the optimum condition is determined based on each group of the surfaces constituting the three-dimensional shape including each group shape for each of a plurality of predetermined vectors based on the center of gravity of the group shape of each group. After determining the number of intersecting surfaces, which is the number of surfaces where the surface excluding the shape surface and each vector intersects, the surface whose change mode is determined to be changed by, for example, the surface change history determining unit 331 that is a determination unit Compare the vector with the smallest number of intersecting faces among the vector of the attention group shape among the group shapes of the group including the vector with the smallest number of intersecting faces among the vectors of the corresponding group shape corresponding to the attention group. If there is one vector in the same direction, If there are two or more vectors in the same direction, it is a condition that the vector is the sum of the two or more vectors. Can be output or displayed in the shape seen from Therefore, it becomes easy for the user to grasp the contents of the design change. In particular, even when the shape whose design has been changed has moved from the position before the change, the user can easily grasp the contents of the design change.

  Further, for example, the shape difference display unit 17 that is an output unit, the attention group shape among the group shapes of the groups including the surface that is determined to be changed by the surface change history determination unit 331 that is a determination unit, and A first part including the peripheral part, and a corresponding group shape corresponding to the group shape of interest and a second part including the peripheral part of the corresponding group shape and located at a position corresponding to the first part When output, since the larger one of the group shape of interest and the corresponding group shape is enlarged or reduced at the same magnification so that the largest shape is output, both the group shapes before and after the change are output. Both can fit on the screen and can be enlarged to fill the screen. Therefore, it becomes easy for the user to grasp the contents of the design change. In particular, even when the shape whose design has been changed has moved from the position before the change, the user can easily grasp the contents of the design change.

The structure of the design change display apparatus 1 which is one Embodiment of this invention and the apparatus relevant to it are shown. The structure of the optimal gaze vector calculation part 15 shown in FIG. 1 is shown. A part 90 of the three-dimensional CAD data stored in the model data storage device 8 shown in FIG. 1 is shown. The surface information 91 of the surface detected by the shape difference surface detection part 12 shown in FIG. 1 is shown. An example of the surface group divided | segmented by the shape difference surface grouping part 13 shown in FIG. 1 is shown. An example of the bounding box 40 of the surface group shown in FIG. 5 is shown. An example of the surface group information 92 of the surface group shown in FIG. 5 is shown. An example of the three-dimensional shape before and after the change which is a comparison object by the design change display apparatus 1 shown in FIG. 1 is shown. An example of the surface with the difference of the three-dimensional shape 51 before the change detected by the shape difference surface detection unit 12 shown in FIG. 1 is shown. An example of a surface having a difference in the three-dimensional shape 52 after the change detected by the shape difference surface detection unit 12 shown in FIG. 1 is shown. It is a figure for demonstrating the number of the line-of-sight vectors utilized in the optimal line-of-sight vector calculation part 15 shown in FIG. 10 shows an example of a line-of-sight vector for the three-dimensional shape 51 before the change shown in FIG. 13 shows line-of-sight vector information 93 representing the line-of-sight vector shown in FIG. 12 in three-dimensional coordinates. An example of the screen 60 which the shape difference display part 17 shown in FIG. 1 displays is shown. It is the figure which emphasized the surface which has a difference in the three-dimensional shape before and behind the change shown in FIG. The three-dimensional shape 53 to which the note which shows a different location is added to the three-dimensional shape 51 before the change shown in FIG. A three-dimensional shape 54 of the three-dimensional shape 53 shown in FIG. An image 62 displayed on the screen 60 by enlarging the shape of the surface group shown in FIG. 18 shows an image 63 displayed on the screen 60 by enlarging the shape of the changed surface group corresponding to the surface group shown in the image 62 shown in FIG. It is a flowchart which the design change display apparatus 1 shown in FIG. 1 processes.

The structure of the design change display apparatus 2 which is the 2nd Embodiment of this invention and the apparatus relevant to it are shown. An example of the format 80 of the design change report stored in the document storage device 31 shown in FIG. 21 is shown. An example of the design change report 81 created by the document creation unit 30 shown in FIG. 21 is shown. It is a flowchart which the design change display apparatus 2 shown in FIG. 21 processes. A part of structure of the design change display apparatus 3 which is the 3rd Embodiment of this invention is shown. An example of the surface group information 94 stored in the shape difference group storage device 34 shown in FIG. 25 is shown. An example of the dimension change information 95 memorize | stored in the shape difference group memory | storage device 34 shown in FIG. An image 64 obtained by adding the changed content to the image 63 illustrated in FIG. 19 is illustrated. 23 shows a design change report 82 in which the change contents are added to the design change report 81 shown in FIG. The structure of the design change display apparatus 4 which is the 4th Embodiment of this invention and the apparatus relevant to it are shown. An example of a 4 × 4 transformation matrix used by the viewpoint / magnification storage unit 372 shown in FIG. 30 is shown. An example of the transformation determinant used by the viewpoint / magnification storage unit 372 shown in FIG. 30 is shown. The example of the shape which the viewpoint and magnification change part 371 shown in FIG. 30 performed movement, rotation, and expansion / contraction is shown. It is an example which showed the shape after change corresponding to the shape before change shown in FIG. 33 from the same direction. It is a flowchart which the design change display apparatus 4 shown in FIG. 30 processes. The structure of the design change display apparatus 5 which is the 5th Embodiment of this invention and the apparatus relevant to it are shown. An example of the shape before and after the change which the design change display apparatus 5 shown in FIG. 36 outputs is shown.

Explanation of symbols

1-5 Design change display device 8 Model data storage device 9 Output device 11, 21 Model data reading unit 12, 22 Shape difference surface detection unit 13, 23, 33 Shape difference surface grouping unit 14, 24, 34 Shape difference group storage device 15, 25 Optimal line-of-sight vector calculation unit 16, 26 Shape difference surface enhancement display unit 17, 27, 37 Shape difference display unit 28 Image capture unit 29 Image storage device 30 Document creation unit 31 Document storage device 40 Bounding box 50 Three-dimensional before change Shape 60 Three-dimensional shape after change 151 Line-of-sight vector interference frequency calculation unit 152 Line-of-sight vector interference frequency storage unit 153 Minimum interference frequency line-of-sight vector calculation unit 331 Surface change history determination unit 332 Changed surface search unit 333 Dimension information acquisition unit 3 34 Dimensional information comparison unit 335 Difference size storage unit 336 Surface change history display unit 337 Surface change history description unit 338 Difference size display unit 339 Difference size description unit 371 Viewpoint / magnification change unit 372 Viewpoint / magnification storage unit 373 Viewpoint / magnification before change Storage device 374 Viewpoint / magnification change unit after change

Claims (14)

Obtaining means for obtaining three-dimensional CAD data of two three-dimensional shapes to be compared from a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces;
Of the two three-dimensional shapes indicated by the three-dimensional CAD data acquired by the acquisition means, the surface of one three-dimensional shape and the surface of another three-dimensional shape are associated with each other by the surface identification information, and are compared. An extraction means for extracting identification information of a surface not to be compared and identification information of both surfaces whose shapes to be compared do not match;
Each surface indicated by the surface identification information extracted by the extraction means is divided into a group consisting of surfaces adjacent to each other for surfaces with adjacent surfaces, and a group consisting of only those surfaces for surfaces without adjacent surfaces. Grouping means to divide into
For each group divided by the grouping means, a vector that is based on the barycentric position of the three-dimensional group shape formed by the surfaces included in each group and that satisfies a predetermined optimum condition is determined. An optimal vector determining means;
When the target group shape of the group selected from among the group shapes of the group divided by the grouping means, the three-dimensional shape that includes the target group shape, and the surface that forms the target group shape include the comparison target surface Includes an output unit that outputs the group shape of the group including the comparison target surface to the output device in a shape viewed from the direction opposite to the direction of the optimal vector determined by the optimal vector determination unit with respect to the target group shape. A design support apparatus characterized by that. The two three-dimensional shapes to be compared acquired by the acquisition means are the three-dimensional shape before the change and the three-dimensional shape after the change of the three-dimensional shape,
The output means includes the group shape including the comparison target surface when the target group shape, the three-dimensional shape including the target group shape, and the surface forming the target group shape include a comparison target surface. When the combination shape consisting of the corresponding group shape is output to the output device, the surface indicated by the surface identification information extracted by the extraction means is distinguished from the surface other than the surface indicated by the extracted surface identification information. Output, adding information indicating the position occupied by the group shape of interest in the three-dimensional shape that includes the group shape of interest, and expanding and outputting the group shape of interest and the corresponding group shape. The design support apparatus according to claim 1, wherein:   The predetermined optimum condition is that each of a plurality of predetermined vectors based on the barycentric position of the group shape of each group constitutes a surface of each group shape among the surfaces constituting a three-dimensional shape including each group shape. For the number of intersecting surfaces, which is the number of surfaces that intersect the surface excluding, the condition that the number of intersecting surfaces is one is the condition that it is the least intersecting surface vector, and the least number of intersecting surfaces The design support apparatus according to claim 2, wherein when there are two or more vectors, the condition is that the vector is a sum vector of vectors having the smallest number of intersecting planes. Storage means;
Image capturing means for capturing an attention group shape output to the output device by the output means, a three-dimensional shape including the attention group shape, and a corresponding group shape as an image;
Document generation means for generating a document in a predetermined format for each group using the image captured by the image capture means, and storing document information representing the generated document in the storage means;
The design support apparatus according to claim 2, wherein the output unit outputs the document information stored in the storage unit to an output device. The three-dimensional CAD data stored by the storage device includes surface identification information for each surface of each three-dimensional shape,
If each surface identification information extracted by the extraction means is included in the three-dimensional CAD data before the change and is not included in the three-dimensional CAD data after the change, the surface change mode indicated by the surface identification information is erased. If it is determined that it is not included in the three-dimensional CAD data before the change and is included in the three-dimensional CAD data after the change, it is determined that the surface change mode indicated by the surface identification information is additional, and the three before the change Determining means for determining that the change mode of the surface indicated by the surface identification information is a change when included in the three-dimensional CAD data and the three-dimensional CAD data after the change;
A change history unit that associates the surface identification information extracted by the extraction unit with the change mode information representing the change mode determined for each surface by the determination unit and stores the change mode information in the storage unit; The design support apparatus according to claim 4. The storage device includes dimension information relating to dimensions of each side forming the periphery of each surface of the three-dimensional shape before and after the change, and includes dimension identification information for identifying each dimension. Information is stored for each surface identification information,
The acquisition means acquires dimensional information for each surface identification information from a storage device,
Search means for searching for surface identification information associated with change mode information whose change mode is change from among surface identification information stored in the storage unit;
Among the dimension information acquired by the acquisition means, from the dimension information including the surface identification information searched by the search means, extract dimension information having a difference between the dimension information before the change and the dimension information after the change, 6. The design support apparatus according to claim 5, further comprising dimension information extracting means for storing the extracted dimension information in correspondence with the surface identification information and storing it as dimension change information by the storage means.   When the output unit outputs the combination shape to an output device, the change mode information associated with the surface identification information of the surface included in the attention group shape among the change mode information stored by the storage unit The design support apparatus according to claim 5, wherein the design support apparatus outputs the result.   When the document generation unit generates the document in the predetermined format, the change mode information associated with the surface identification information of the surface included in the attention group shape among the change mode information stored by the storage unit The design support apparatus according to claim 5, wherein the design support apparatus is generated by adding   The output means, when outputting the combined shape to an output device, among the dimension change information stored by the storage means, the dimension change information associated with the surface identification information of the surface included in the target group shape The design support apparatus according to claim 6, further comprising:   The document generation means generates dimension change information associated with surface identification information of the surface included in the group of interest among the dimension change information stored by the storage means when generating the document in the predetermined format. The design support apparatus according to claim 6, wherein the design support apparatus is generated by adding It further has an input means for inputting movement amount information representing a movement amount, rotation angle information representing a rotation angle, and magnification information representing an enlargement / reduction magnification,
The output means inputs the group shape of the group of interest and the group shape of the group including the surface of the comparison target if there is a surface to be compared to the surface forming the group of interest group shape. It is moved by the amount of movement indicated by the amount information, rotated by the rotation angle indicated by the rotation angle information input by the input means, and further enlarged or reduced by the magnification indicated by the magnification information input by the input means and output. The design support apparatus according to claim 1.   The predetermined optimum condition is that the surface of each group shape among the surfaces constituting the three-dimensional shape including each group shape for each of a plurality of predetermined vectors based on the center of gravity of the group shape of each group. After obtaining the number of intersecting surfaces, which is the number of surfaces where the surface excluding the surface and each vector intersect, the attention group of the group shape of the group including the surface whose change mode is determined to be changed by the determining means Compare the vector with the smallest number of intersecting planes among the shape vectors and the vector with the smallest number of intersecting faces among the corresponding group shape vectors corresponding to the target group, and there is one vector in the same direction. In some cases, the condition is that the vectors are in the same direction, and there are two or more vectors in the same direction. If it is, the design support apparatus according to claim 5, characterized in that the condition that the vector sum of the two or more vectors.   The output means corresponds to the attention group shape of the group shape of the group including the surface whose change mode is determined to be change by the determination means and the first portion including the periphery thereof, and the attention group shape. When outputting together the corresponding group shape and the second portion that includes the peripheral portion of the corresponding group shape and is located at the position corresponding to the first portion, the larger of the attention group shape and the corresponding group shape The design support apparatus according to claim 5, wherein the design support apparatus outputs the image after being enlarged or reduced at the same magnification so that the shape of the side becomes the maximum size. An acquisition step of acquiring three-dimensional CAD data of two three-dimensional shapes to be compared from a storage device that stores three-dimensional CAD data representing a three-dimensional shape constituted by a plurality of surfaces;
Of the two three-dimensional shapes indicated by the three-dimensional CAD data acquired in the acquisition step, the surface of one three-dimensional shape and the surface of the other three-dimensional shape are associated with each other by the surface identification information to be compared, An extraction process for extracting the identification information of the non-comparison surface and the identification information of both surfaces whose shapes do not match,
Each surface indicated by the surface identification information extracted in the extraction process is divided into groups that are adjacent to each other for surfaces with adjacent surfaces, and groups that are only those surfaces for surfaces that do not have adjacent surfaces. Grouping process divided into
For each group divided in the grouping process, a vector that is based on the position of the center of gravity of the three-dimensional group shape formed by the surfaces included in each group is determined, and an optimal vector that satisfies a predetermined optimal condition is determined. An optimal vector determination step;
When the target group shape of the group selected from the group shapes of the group divided in the grouping process, the three-dimensional shape that contains the target group shape, and the surface that forms the target group shape have a comparison target surface Includes an output step of outputting the group shape of the group including the comparison target surface to the output device in a shape viewed from the direction opposite to the direction of the optimal vector determined in the optimal vector determination step for the target group shape. A design support method characterized by that.

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