JP2008299643A - Three-dimensional model forming device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional model forming device, capable of efficiently forming a symmetric form model of a three-dimensional model, and to provide a program for making a computer function as this device. <P>SOLUTION: Formation history data in which data regulating a model shape obtained by each drawing processing which is performed, until a three-dimensional model is formed is collected in time series, is read for each time-series element; a determination part 6 determines a position requiring change for forming a symmetric shape model, based on designated kind of symmetric processing and symmetric reference, and a history change part 7 changes element data, to data matched to the symmetric shape model based on the designated kind of symmetric processing and symmetric reference; and a three-dimensional model formation part 2 forms a symmetric shape model of an original three-dimensional model, in accordance with the formation history data including element data determined to need no change and the changed element data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a three-dimensional model creation apparatus used for three-dimensional CAD (Computer Aided Design) and a program for causing a computer to function as this apparatus.

  For example, in the conventional 3D model creation device disclosed in Patent Document 1, the created 3D model data is registered in a database together with the feature amount data, and the 3D model is updated each time the 3D model is processed and edited. The time-series three-dimensional model data until it is created is stored as history data. Thus, efficient product development can be achieved using the history data and registration data of the three-dimensional model database.

JP 2003-296382 A

  In the conventional 3D model creation apparatus, it is possible to create a new 3D model using the history data and registration data of the 3D model database. However, in order to create a symmetrical model of an original three-dimensional model (hereinafter referred to as the original three-dimensional model), it is necessary to perform mirror copy or create a new three-dimensional model having a symmetric shape. It was.

  When a new symmetrical shape model is created, the same creation process as the original three-dimensional model needs to be repeated, which is not efficient. In the mirror copy, the designer needs to determine and set which part of the original three-dimensional model is changed to become a symmetrical model. For this reason, when the original three-dimensional model has a complicated shape, it may be more time-consuming and inefficient than newly creating a symmetrical model.

  The present invention has been made to solve the above-described problems, and obtains a three-dimensional model creation apparatus capable of efficiently creating a symmetrical model of a three-dimensional model and a program for causing a computer to function as this apparatus. For the purpose.

  The three-dimensional model creation apparatus according to the present invention includes a three-dimensional model for creating a symmetric shape model, an input unit that accepts input of information specifying a type of symmetry processing and a symmetry reference, and a three-dimensional model until the three-dimensional model is created. The creation history data related to the three-dimensional model specified through the input unit is stored in a time series from the storage unit that stores the creation history data in which the data defining the model shape obtained in each rendering process performed is collected in time series. The creation history reading unit for reading each element, and the creation history data from the creation history reading unit are input for each element, and based on the type of symmetry processing and the symmetry criteria specified through the input unit, the symmetrical shape model is Discrimination based on discriminating part that discriminates the part of the element data that needs to be changed before creation, and the type of symmetry processing and symmetry criteria specified via the input part A history change unit that changes the element data determined to be changed by the data to the data corresponding to the symmetric shape model, the element data determined not to be changed by the determination unit, and the element data changed by the history change unit And a three-dimensional model creation unit that creates a symmetric shape model according to the history data.

  According to the present invention, the storage unit stores the creation history data in which the data defining the model shape obtained in each drawing process performed until the three-dimensional model is created is summarized in time series. The creation history data related to the 3D model is read for each time-series element, and based on the specified symmetry processing type and symmetry criteria, the part of the element data that needs to be changed is determined in order to create the symmetrical model. The element data determined to be changed based on the specified symmetry processing type and the symmetry criterion are changed to data corresponding to the symmetrical shape model, and the element data determined to be unnecessary and the changed element data are changed. Since the symmetrical shape model is created according to the creation history data, the symmetry processing with respect to the desired symmetry standard is automatically executed for the desired three-dimensional model. Et al., There is an effect that generation processing of symmetrical shape model can be efficiently performed.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an overview of the creation of a three-dimensional model according to the present invention, and shows a case where a symmetrical model of an original three-dimensional model is created. A three-dimensional model creation apparatus according to the present invention is constructed on a computer as shown in FIG. 1 and displays a three-dimensional model on a display screen of the computer. Also in the present invention, creation history data is accumulated every time a three-dimensional model is created. The creation history data in the present invention is data in which data defining a model shape in the middle of creation obtained by each drawing process and drawing processes performed until a three-dimensional model is created is collected in time series.

  For example, a two-dimensional sketch shape that becomes a part of the outline of the three-dimensional model to be created is created, and the sketch is extruded in a predetermined direction to form a three-dimensional model, and holes are formed in the three-dimensional model. Consider a case where a three-dimensional model is created by performing the forming process. In this case, the creation history data includes sketch creation processing, extrusion processing, and drilling processing in the order in which the processing is performed. In addition, as creation history data related to sketch creation processing, there is data that defines sketch shape such as the position of each vertex of the sketch and the length of the line segment between vertices, and in extrusion processing, there is the direction of sketch shape extrusion, In the drilling process, data defining the size, depth, position, etc. of the hole can be mentioned.

  In the 3D model creation device according to the present invention, when the symmetry criterion selected by the designer is set, the creation history data stored together with the data of the original 3D model is read, and the creation history is based on the selected symmetry criterion. The data to be changed in the creation of the symmetric shape model is discriminated from the data, the change processing is performed, and the symmetric shape three-dimensional model is created according to the obtained creation history data. In other words, according to the present invention, a designer can automatically create a symmetrical three-dimensional model related to a selected symmetrical reference simply by selecting a symmetrical reference with respect to the original three-dimensional model and setting it in the three-dimensional model creating apparatus. Can do.

  FIG. 2 is a block diagram showing the configuration of the three-dimensional model creation apparatus according to Embodiment 1 of the present invention. 2, the 3D model creation device 1 includes a 3D model creation unit 2, a 3D model data storage unit 3, a creation history reading unit 4, a setting input unit 5, a determination unit 6, and a history change unit 7. The three-dimensional model creation unit 2 generates data that defines the surfaces constituting the three-dimensional model desired by the designer in accordance with the designer's instructions input via the setting input unit 5, and based on the data A three-dimensional model is created, and a three-dimensional model is created according to the creation history data input from the determination unit 6 or the history change unit 7.

  The storage unit 3 stores the 3D model data defining the 3D model created by the 3D model creation unit 2 in association with the creation history data. The storage unit 3 may be constructed on a storage area of a storage medium of a hard disk device or an external storage device mounted on a computer constituting the three-dimensional model creation device 1 and can perform data communication with the computer. You may build in an external storage device.

  The creation history reading unit 4 reads the creation history data of the designated original three-dimensional model from the storage unit 3 for each element, and outputs it to the determination unit 6. The setting input unit 5 provides a GUI (Graphical User Interface) for interactively exchanging information with a designer via a display monitor in cooperation with an input device such as a keyboard and a mouse provided in the computer. It is a component to do. For example, when the designer inputs the type of symmetry processing and the selection information of the symmetry reference, this information is output to the determination unit 6.

  The discriminating unit 6 discriminates, for each element, creation history data that needs to be changed to create a symmetric shape model of the original three-dimensional model, based on the discriminating conditions regarding the symmetric processing specified via the setting input unit 5. . The determination condition regarding the symmetry processing is set in advance in the determination unit 6 in association with the type of symmetry processing (plane symmetry, axial symmetry, or origin symmetry). In addition, the following can be considered as a determination condition regarding the symmetry processing.

  When plane symmetry is specified as the type of symmetry processing and a plane in the 3D space is selected as the symmetry reference, the model shape being created specified for each element of the creation history data of the original 3D model is symmetrical Whether or not it has a dimension component that is not parallel to the reference surface is set as a determination condition. In addition, when axis symmetry is designated as the type of symmetry processing and an axis in the three-dimensional space is selected as the symmetry reference, whether or not the model shape being created has a dimension component that is not parallel to the symmetry reference axis. Use as a judgment condition. Furthermore, when origin symmetry is designated as the type of symmetry processing and the origin of the three-dimensional coordinate system defined in the three-dimensional space is selected as the symmetry reference, all elements of the creation history data are to be changed.

  The history change unit 7 receives the creation history data determined to be changed by the determination unit 6, and changes the creation history data to create a symmetrical shape model related to the symmetry reference set via the setting input unit 5. To do. The processing content of this change is preset in the history changing unit 7 in association with the type of symmetry processing (different from plane symmetry, axis symmetry, and origin symmetry).

  For example, when plane symmetry is specified as the type of symmetry processing and a plane in a three-dimensional space is set as the symmetry reference, the history changing unit 7 creates a model shape that is being created that is defined by the element data of the creation history data. Are divided into a component perpendicular to the symmetric reference plane and a horizontal component, and only the dimension perpendicular to the symmetric reference plane is inverted. That is, the symmetric reference plane is perpendicular to the symmetric reference plane as a plane passing through the origin of the three-dimensional coordinate system. Inverts the sign of the dimension component in the direction.

  The 3D model creation unit 2, the storage unit 3, the creation history reading unit 5, the setting entry unit 5, the determination unit 6, and the history change unit 7 described above are included in the computer processing unit that constitutes the 3D model creation device 1. By reading and executing a three-dimensional model creation program according to the gist of the present invention, it is realized as a specific means in which the hardware and software of the computer cooperate. Note that the configuration of the computer itself and its basic functions can be easily recognized by those skilled in the art based on the common general technical knowledge in the technical field, and are not directly related to the essence of the present invention, so detailed description thereof is omitted. To do.

Next, the operation will be described.
FIG. 3 is a flowchart showing the flow of the symmetric shape model creation process performed by the three-dimensional model creation device according to the first embodiment. The symmetric shape model creation process will be described in detail with reference to this figure. First, the 3D model creation unit 2 in the 3D model creation device 1 creates a certain original 3D model (step ST1), and stores the 3D model data in the storage unit 3. At this time, creation history data until the creation of the three-dimensional model is also stored in the storage unit 3.

  Next, the designer selects an original three-dimensional model for which a symmetric shape model is to be created, a symmetric processing type (plane symmetry, axial symmetry, or origin symmetry) and a symmetry criterion via the setting input unit 5 ( Step ST2). Information for designating the selected original three-dimensional model is output from the setting input unit 5 to the creation history reading unit 4, and information for designating the type of symmetry processing and the symmetry reference is sent from the setting input unit 5 to the determination unit 6 and the history. Each is output to the changing unit 7. The creation history reading unit 4 reads the creation history data of the original three-dimensional model designated via the setting input unit 5 from the storage unit 3 for each element (in units of elements) and outputs it to the determination unit 6 (step ST3). ).

  The discriminating unit 6 determines a corresponding discriminating condition according to the type of symmetric processing specified via the setting input unit 5, and among the creation history data input from the creation history reading unit 4 based on the discriminating condition, A part that needs to be changed to create a symmetrical model by performing the above-described symmetry processing for the reference is determined for each element (step ST4).

  In step ST4, the data of the part determined not to be changed by the determination unit 6 is set from the determination unit 6 to the three-dimensional model creation unit 2 as the data of the corresponding element of the creation history data of the symmetrical shape model. . The 3D model creation unit 2 creates a symmetric shape model according to the element data of the creation history data, that is, using the element data of the original 3D model as it is (step ST5).

  On the other hand, the data of the part determined to be changed by the determination unit 6 is output from the determination unit 6 to the history change unit 7. The history change unit 7 determines the content of the corresponding change process according to the type of symmetry process set via the setting input unit 5, and the element data of the creation history data determined to be changed by the determination unit 6 Then, the processing content is changed. The element data changed in this way is set from the history changing unit 7 to the three-dimensional model creating unit 2 as corresponding element data of the creation history data of the symmetrical shape model. The three-dimensional model creation unit 2 creates a symmetric shape model according to the element data of the creation history data (step ST6).

  When the process of step ST5 or step ST6 is completed, the determination unit 6 determines whether or not the determination of all elements in the creation history data of the original three-dimensional model has been completed (step ST7). At this time, when the next element of the creation history data is input from the creation history reading unit 4 in time series, the determination unit 6 determines that the determination has not been completed yet, and returns to the process of step ST3. The above process is repeated.

  When no element of the creation history data is input from the creation history reading unit 4, the determination unit 6 determines that all the elements have been determined. As a result, the three-dimensional model creation unit 2 completes the creation of the symmetric shape model related to the symmetry process and the symmetry reference selected by the designer according to the creation history data determined by the determination unit 6 as to whether or not change is possible (step ST8). .

Next, a specific example will be described.
Thereafter, the three-dimensional model shown in FIG. 4A having the creation history data shown in FIG. 4B is designated as the original three-dimensional model 8, and the three-dimensional coordinates set in the original three-dimensional model 8 are designated. A case where the plane symmetry process using the yz plane of the system as the symmetry reference plane 10 is selected will be described. The creation history reading unit 4 reads the creation history data of the original three-dimensional model 8 designated via the setting input unit 5 from the storage unit 3 for each element, and outputs it to the determination unit 6. Here, first, among the elements of the creation history data shown in FIG. 4B, data on the model shape in the middle of creation obtained by the creation processing 11a of the cross-sectional shape (sketch shape) processed first in time series. Is read out and output to the determination unit 6.

  The determination unit 6 performs a plane symmetry process on the symmetry reference plane 10 among the creation history data input from the creation history reading unit 4 based on the determination condition corresponding to the plane symmetry process set via the setting input unit 5. The part that needs to be changed to create a symmetrical model is determined. For example, when the sketch shape A having the dimensions of the vertex positions and the edge lines a to e illustrated in FIG. 5A is obtained by the cross-sectional shape creation process 11a, the determination unit 6 has dimensions that are not parallel to the symmetry reference plane 10. A part of the sketch shape that needs to be changed is determined by using whether or not it has a component as a determination condition.

  Here, since the ridge lines a and b have only dimension components parallel to the symmetry reference plane 10, the data defining the ridge lines a and b is sent to the 3D model creation unit 2 as element data that does not need to be changed. It is done. On the other hand, the distance D between the ridge lines c to e and the sketch shape A and the symmetric reference plane 10 has a dimension component that is not parallel to the symmetric reference plane 10, and thus is determined as element data that defines a location that needs to be changed. It is sent to the history change unit 7. Note that the ridge line d is a ridge line that forms an acute angle portion with an angle of 30 ° in the sketch shape A, so that the dimensional component in the direction perpendicular to the dimensional component parallel to the symmetry reference plane 10 as shown in FIG. (= 80 sin 30 ° = 40). In this case, only the dimension component in the vertical direction is changed.

  In the history change unit 7, the content change processing corresponding to the plane symmetry processing set via the setting input unit 5 is applied to the part that is determined to be changed by the determination unit 6, and the content of the element data is updated. To do. In the example of FIG. 5A, since the symmetric reference plane 10 is a yz plane passing through the origin in the two-dimensional coordinates where the sketch shape A is drawn, the original three-dimensional model 8 is arranged via the symmetric reference plane 10. The positive side of the x axis is taken as the positive side, and the positive and negative dimensions are changed so that the symmetrical shape model is arranged on the negative side of the x axis.

  That is, the interval D between the sketch shape A and the symmetric reference plane 10 has an interval of 60 from the symmetric reference plane 10 along the positive direction of the x-axis. Therefore, as shown in FIG. Inverted and changed to D1 having a distance of −60 from the symmetric reference plane 10 along the negative direction of the x-axis. Further, since the ridge line c having only a dimension component perpendicular to the symmetry reference plane 10 has a length of 140 along the positive direction of the x-axis, as shown in FIG. Is changed to a ridge line c1 having a length of −140 along the negative direction of the x-axis. Further, with respect to the ridge line d, the positive / negative of the dimension component in the direction perpendicular to the symmetry reference plane 10 is reversed and changed to the dimension component having a length of −40 along the negative direction of the x-axis. Similarly, the ridgeline e1 is changed to the ridgeline e1 by reversing the sign of the ridgeline e.

  Data defining the ridge lines c1 to e1 and the interval D1 obtained by the change process by the history change unit 7 is sent to the three-dimensional model creation unit 2. The three-dimensional model creation unit 2 renders a model shape according to the element data of the cross-sectional shape creation process 11a input from the determination unit 6 and the history change unit 7. Here, the dimensions of the ridge lines a and b parallel to the symmetry reference plane 10 are not changed, and the dimensions of the ridge lines a1 and b1 are used as they are, and the sketch shape B for the symmetric shape model as shown in FIG. Is created.

  Subsequently, among the elements of the creation history data shown in FIG. 4B, data relating to the model shape in the middle of creation obtained by the extrusion processing 11b processed after the sectional shape creation processing 11a in time series is read. And output to the determination unit 6. If the input element is the extrusion process 11b, the determination unit 6 determines that no change is necessary, and sends information such as the extrusion direction and the extrusion distance specified in the extrusion process 11b to the three-dimensional model creation unit 2. The three-dimensional model creation unit 2 draws a model shape according to the element data of the extrusion process 11b input from the determination unit 6. As a result, as shown in FIG. 6, the sketch shape B is subjected to extrusion processing in the same extrusion direction as the original three-dimensional model 8, and a model shape 8a is created.

  Finally, among the elements of the creation history data shown in FIG. 4 (b), data relating to the model shape in the middle of creation obtained in the drilling process 11c processed next to the extrusion process 11b in time series is read. The data is output to the determination unit 6. The discriminating unit 6 discriminates a portion that needs to be changed in the drilling processing 11c under the same discriminating conditions as in the cross-sectional shape creation processing 11a. For example, when the hole 9 is formed at the position and diameter shown in FIG. 7A by the drilling process 11c, the determination unit 6 determines whether it has a dimension component that is not parallel to the symmetry reference plane 10 as a determination condition. Determine where changes are needed.

  Here, the data defining the dimension component h parallel to the symmetry reference plane 10 among the dimensions defining the diameter f of the hole 9 and the position thereof is sent to the three-dimensional model creation unit 2 as element data that does not need to be changed. On the other hand, the element data that defines the dimension component g that is not parallel to the symmetric reference plane 10 among the dimensions that define the position of the hole 9 is determined as a place that needs to be changed, and is sent to the history change unit 7.

  In the history change unit 7, as in the case of the cross-sectional shape creation process 11a, the side on which the original three-dimensional model 8 is arranged via the symmetry reference plane 10 is set as the positive direction of the x axis, and the symmetrical shape model is the x axis. Change the dimensions so that they are placed on the negative side. That is, as shown in FIG. 7B, the positive / negative of the dimension component g perpendicular to the symmetric reference plane 10 is reversed to change to g1 having a dimension of −20 from the symmetric reference plane 10 along the negative direction of the x axis. change. Data defining the dimension component g obtained by the change process by the history change unit 7 is sent to the three-dimensional model creation unit 2.

  The three-dimensional model creation unit 2 draws a model shape according to the element data of the drilling process 11 c input from the determination unit 6 and the history change unit 7. Here, the diameter f of the hole 9 and the dimension component h parallel to the symmetry reference plane 10 are not changed, but are directly used as the diameter f1 and the dimension component h1, and the hole 9a is added to the symmetrical shape model 8a shown in FIG. Is created. When the three-dimensional model creation apparatus 1 automatically executes the above processing, a symmetric shape model 8a as shown in FIG. 8 is created. The created symmetrical shape model 8a may be registered in the storage unit 3 in association with the original three-dimensional model 8, or may be output to a display monitor and presented to the designer.

  In the above description, the extrusion process is determined to be an element that does not need to be changed. However, depending on the type of the symmetry process, it is determined to be an element that needs to be changed. For example, when the axial symmetry process is selected, the extrusion direction and the extrusion distance of the extrusion process are changed to a direction and a distance that are axially symmetric with respect to the original three-dimensional model in the three-dimensional space.

  As described above, according to the first embodiment, creation history data in which data defining a model shape obtained by each drawing process performed until a three-dimensional model is created is collected in time series. The creation history data related to the three-dimensional model specified via the setting input unit 5 is read from the storage unit 3 for each time-series element, and the type of symmetry processing and the symmetry standard specified via the setting input unit 5 are read. Based on the type of symmetry processing and the symmetry criterion specified via the setting input unit 5, the determination unit 6 determines the portion of the element data that needs to be changed when creating the symmetrical shape model. The changing unit 7 changes the element data determined to be changed to data corresponding to the symmetric shape model, and follows the creation history data including the element data determined to be unnecessary and the changed element data. Since the three-dimensional model creation unit 2 creates a symmetric shape model, the symmetric processing with respect to the desired symmetric reference is automatically performed on the desired three-dimensional model, so that the symmetric shape model creation processing is efficiently performed. be able to.

It is a figure which shows the outline | summary of 3D model preparation of this invention. It is a block diagram which shows the structure of the three-dimensional model creation apparatus by Embodiment 1 of this invention. 3 is a flowchart illustrating a flow of a process for creating a symmetrical shape model by the three-dimensional model creating apparatus according to the first embodiment. It is a figure which shows an original three-dimensional model and its creation log | history data. It is a figure for demonstrating the discrimination | determination of changeability with respect to the shape obtained by the creation process of cross-sectional shape, and a change process. It is a figure for demonstrating the extrusion process of a symmetrical model. It is a figure for demonstrating the drilling process of a symmetrical shape model. It is a perspective view which shows the symmetrical shape model with respect to the original three-dimensional model in Fig.4 (a).

Explanation of symbols

  1 3D model creation device, 2 3D model creation unit, 3 storage unit, 4 creation history reading unit, 5 setting input unit, 6 discrimination unit, 7 history change unit, 8 original 3D model, 8a symmetrical shape model, 9 , 9a hole, 10 symmetry reference plane, 11a cross-sectional shape creation process, 11b extrusion process, 11c drilling process.

Claims (2)

A three-dimensional model for creating a symmetric shape model, an input unit that receives input of information specifying a type of symmetry processing and a symmetry criterion;
Designated via the input unit from a storage unit that stores creation history data in which data defining the model shape obtained in each drawing process performed until a three-dimensional model is created is summarized in time series A creation history reading unit that reads creation history data related to the three-dimensional model for each time-series element;
The creation history data is input for each element from the creation history reading unit, and based on the type of symmetry processing and the symmetry criterion designated via the input unit, A discriminator for discriminating a portion that needs to be changed;
A history change unit that changes element data determined to be changed by the determination unit to data corresponding to the symmetric shape model based on the type of symmetry processing and the symmetry criterion specified through the input unit;
3D model creation comprising a 3D model creation unit that creates the symmetrical shape model according to creation history data composed of element data determined not to be changed by the discrimination unit and element data changed by the history change unit apparatus. A three-dimensional model for creating a symmetric shape model, an input unit for accepting input of information specifying a type of symmetry processing and a symmetry criterion;
Designated via the input unit from a storage unit that stores creation history data in which data defining the model shape obtained in each drawing process performed until a three-dimensional model is created is summarized in time series A creation history reading unit that reads creation history data related to a three-dimensional model for each element in time series,
The creation history data is input for each element from the creation history reading unit, and based on the type of symmetry processing and the symmetry criterion designated via the input unit, A discriminator for discriminating a portion that needs to be changed,
A history change unit that changes the element data determined to be changed by the determination unit to data corresponding to the symmetrical shape model, based on the type of symmetry processing and the symmetry criterion designated via the input unit,
A program that causes a computer to function as a three-dimensional model creation unit that creates the symmetrical shape model in accordance with creation history data including element data determined to be unnecessary by the determination unit and element data changed by the history change unit.

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