JP4915518B2 - Three-dimensional model display device, program and method thereof - Google Patents

Description

  The present invention relates to a three-dimensional model display device that displays a three-dimensional model, a program and a method thereof, and more particularly, to a three-dimensional model display device and a program and a method thereof with a small display processing load.

  In recent years, there has been a tendency for the shell size to become finer in order to improve analysis accuracy, and it has become difficult to perform model rotation operations and the like. Even in a shell model that is said to have a relatively light burden on the graphic board, if the number of elements and the number of parts are too large, the drawing response is slow when displaying shading.

  On the other hand, techniques for improving the drawing response are disclosed in Patent Document 1 and Patent Document 2 below.

  The three-dimensional figure drawing apparatus disclosed in Patent Document 1 converts coordinate data of an object's object coordinate system into coordinate data of a viewpoint coordinate system using a geometric processing unit that performs coordinate conversion at high speed, and the converted coordinate data The maximum and minimum values of the x, y, and z coordinate values obtained from the above are written in a register, and read out by the CPU as the position determination means to form a three-dimensional boundary region (bounding box) surrounding the object, The positional relationship / distance between objects is detected, and the presence / absence of collision between objects is determined. According to this, the positional relationship between the three-dimensional objects can be detected at high speed without imposing a burden on the CPU.

In addition, the 3D image generation system disclosed in Patent Document 2 is an object to be displayed from an input unit that inputs predetermined graphic data composed of a plurality of object groups, and a plurality of object groups that are input by the input unit. Object group selecting means for selecting an object group, polygon selecting means for selecting a polygon to be drawn from a plurality of polygons constituting the object group selected by the object group selecting means, and drawing selected by the polygon selecting means Image drawing means for drawing an image according to a target polygon. Then, the object group to be displayed is selected from the plurality of object groups input by the input unit, the drawing target polygon is selected from the plurality of polygons constituting the object group selected by the object group selecting unit, and selected. According to the polygon to be drawn, for example, an image is drawn by a rendering process. According to this, a group of objects that are not to be displayed are omitted at once, and polygons that are not to be drawn are omitted, so that the processing speed of image generation according to 3D graphic data is improved and the display cycle is shortened. be able to.
JP-A-8-315180 JP 2000-31254 A

  According to the three-dimensional graphic drawing apparatus of Patent Document 1, in the case of drawing where it is necessary to grasp the update of the positional relationship between objects such as a collision by detecting the positional relationship between the objects at high speed using a bounding box for each object. The overall drawing response is improved. However, there is a problem that response improvement cannot be expected when the positional relationship between objects is not updated in drawing. For example, when a stationary object is drawn with a different viewpoint, the response is not improved even if the technique of Patent Document 1 is applied. In addition, although the drawing response is improved by applying the technique of Patent Document 1 to the game software that draws roughly by detecting a collision between objects, high accuracy such as simulation analysis in CAE (Computer Aided Engineering) is achieved. It is extremely difficult to apply the technique in the required drawing process. In other words, it is necessary to obtain highly accurate analysis data in collision analysis, and the presence or absence of a collision is inevitably detected, so it is meaningless even if only the presence or absence of a collision is detected by a separate low-load process. This is a waste of double processing.

  Further, according to the three-dimensional image generation system of Patent Document 2, it is selected whether or not display is performed as a preprocessing for each object group as a lump rather than for each polygon. The drawing response is improved. However, since the selection process for each object group is performed in detail according to the coordinates after converting the world coordinates to the view coordinates after obtaining the bounding box of the object, it is necessary every time the viewpoint changes. Therefore, there is a problem that the improvement of the drawing response stays constant.

  The present invention has been made to solve the above-described problem, and a three-dimensional model display device that improves the drawing response of a model without subjecting a part or the like that does not need to be displayed to a display process even when the viewpoint is changed. It is an object to provide a program and a method thereof.

  The model's drawing response is improved by automatically hiding the parts hidden inside the parts during shading display.

The present invention illustrates a CAE model in which a space exemplified by an automobile is completely closed in a later-described embodiment as a preferable example.
More specifically, if any of the vectors in the X, Y, and Z directions at the eight vertices of MinMaxBOX in the shell element model has an intersection with another part, the element is hidden.
As a processing trigger, display / non-display determination is performed for each part when data is read, when data is updated, or when a part display mask is switched (when part display is specified).

(1) Hidden parts are not displayed The three-dimensional model display apparatus according to the present invention is a three-dimensional model display apparatus that displays a three-dimensional model composed of a plurality of read parts. A MinMaxBox creation unit that creates a MinMaxBox that encloses one part of the dimensional model in a rectangular shape, and a vertex that is connected via one side to a processing target vertex that is the processing target of the rectangular MinMaxBox created by the MinMaxBox creation unit. A vertex vector calculation unit that calculates a vertex vector that is a half line starting from the processing target vertex with a direction vector from a certain connected vertex to the processing target vertex, and each of MinMaxBox calculated by the vertex vector calculation unit Determine whether the vertex vector of the vertex intersects with other parts other than the part to be processed And a component display determination means for not displaying the processing target component when it is determined that all the vertex vectors intersect with other components.

As described above, in the present invention, a MinMaxBox that surrounds a processing target component is created, and each vertex of the MinMaxBox is used as a starting point to obtain a vertex vector that becomes a direction vector from the connected vertex of each vertex to each vertex. Check the intersection of the vertex vector with other parts, and if the vertex vector for all vertices of the processing target part intersects with another part, the processing target part is not displayed, so it is not displayed among the parts that make up the 3D model A part is specified, and it is not necessary to execute at least a drawing process for the specified part, thereby leading to an improvement in drawing response. In addition, even if the parts that are not displayed are changed in viewpoint, the processing of the MinMaxBox creating means, the vertex vector calculating means, and the parts display determining means is not required to be executed, which is superior to the background art. Have
After the component display determination, only the components to be displayed in the three-dimensional model are output to the display device.

(2) High-speed display at the time of subsequent model reading The three-dimensional model display device according to the present invention displays, as necessary, excluding the parts not displayed by the part display determination means and / or the parts not displayed. Component display determination data indicating a component is recorded in association with the three-dimensional model to be processed.

As described above, in the present invention, the component display determination data is recorded in association with the model to be processed. Therefore, even if the 3D model is unloaded and read again, If the parts that are recorded in association with the three-dimensional model that are not displayed and / or the parts that are to be displayed are found, it is not necessary to execute the processes of the MinMaxBox creating means, the vertex vector calculating means, and the part display determining means. The effect is that the processing can be reduced and a high response can be obtained.
In the embodiment to be described later, the component display determination data indicating the components not displayed and the components to be displayed are described. However, the display is unnecessary even if the component display determination data indicating the components not displayed or the components to be displayed is used. Processing that does not display a part can be performed.

(3) Designation of MinMaxBox Side Direction Vectors The three-dimensional model display apparatus according to the present invention is configured so that each side of the rectangular MinMaxBox created by the MinMaxBox creation means is a coordinate axis in the coordinate space of the model to be processed. Is parallel to any of the above.

  As described above, in the present invention, the MinMaxBox side surrounding each part is parallel to one of the coordinate axes of the model coordinate space, so that the MinMaxBox itself becomes a small coordinate space having the same coordinate axis with different origins, and six types of vertex vectors. It is possible to make a component display determination that is not biased with errors only from the direction vector (x-axis direction, x-axis reverse direction, y-axis direction, y-axis reverse direction, z-axis direction, z-axis reverse direction). . The sides of the MinMaxBox of each component do not face the predetermined direction, and the vertical, horizontal, and depth directions of the MinMaxBox vary, and the component display determination cannot be performed with stable accuracy.

(4) Designation of display The three-dimensional model display device according to the present invention designates the parts designated for display among the parts constituting the three-dimensional model as the parts to be processed by the MinMaxBox creating means, and is not designated for display. The parts that have not been designated for display are not displayed because the parts that have not been designated for display are not designated as the parts to be processed by the MinMaxBox creation means. is there.

  As described above, in the present invention, since the parts that do not need to be displayed among the parts constituting the three-dimensional model are not used as the parts to be processed by the respective means of the MinMaxBox creating means, the vertex vector calculating means, and the part display determining means. This eliminates unnecessary processing, contributes to improving the overall response, and the parts that were not specified for display are not handled as other parts for the processing target part, and the model display that matches the non-display of the part that was not specified for display It has the effect that it becomes possible.

(5) Correspondence to transparent parts The three-dimensional model display device according to the present invention, if necessary, selects a transparent part among the parts constituting the three-dimensional model as a processing target part by the part display determination means. Other parts that are compared for the presence or absence of crossing are not used.

  As described above, in the present invention, a part having transparency greater than or equal to a predetermined value is not handled as another part for the part to be processed by the part display determination unit. Therefore, a vertex vector having an intersection with another part to be processed is not used. When other parts that intersect are only transparent parts, the parts that are not displayed are displayed, and the parts surrounded by the parts can be displayed appropriately through the transparent parts when displayed. Have

Although the invention has been described as an apparatus, it can be understood as a three-dimensional model display program and a three-dimensional model table method.
In the embodiment described later, the present invention is described as one function of the CAE system, but it can be realized as a single device. For example, it can be implemented as a viewer of a three-dimensional model.

  These outlines of the invention do not enumerate the features essential to the present invention, and a sub-combination of these features can also be an invention.

  The display / non-display determination does not have to be performed every time the viewpoint is changed. Particularly when a model having a large number of parts is handled, the drawing response is improved, so that the work can be performed without stress, and the work efficiency is improved. Then, by performing the determination in parts, the number of determinations can be reduced because the absolute number is smaller than in the shell or polygon unit.

  Embodiments of the present invention will be described in detail with reference to the drawings. The present invention can be implemented in many different forms. Therefore, it should not be interpreted only by the description of this embodiment. Also, the same reference numerals are given to the same elements throughout the present embodiment.

  In the present embodiment, the system will be mainly described. However, as will be apparent to those skilled in the art, the present invention can also be implemented as a program and method usable in a computer. In addition, the present invention can be implemented in hardware, software, or software and hardware embodiments. The program can be recorded on any computer-readable medium such as a hard disk, CD-ROM, DVD-ROM, optical storage device, or magnetic storage device. Furthermore, the program can be recorded on another computer via a network.

  In the following embodiments, application examples of the present invention in the CAE system will be described. As will be apparent to those skilled in the art, the present invention can also be applied to CAD systems and CAM systems. The present invention can be applied to a device that displays a three-dimensional object in which a certain part is included by one or more other parts. That is, the present invention is a kind of technology for performing three-dimensional display processing using a computer such as a CAE system, a CAD system, or a CAM system.

(First embodiment of the present invention)
[1. System configuration]
[1.1 Hardware configuration]
FIG. 1 is a schematic diagram of a hardware configuration of a computer in which a CAE system according to the present embodiment is constructed.
As shown in FIG. 1, the computer 100 in which the CAE system is constructed includes a CPU (Central Processing Unit) 101, a main memory 102, a motherboard chip set 103, a video card 104, an HDD (Hard Disk drive) 111, and a bridge circuit 112. , Optical drive 121, keyboard 122 and mouse 123.

The main memory 102 is connected to the CPU 101 via the CPU bus and the motherboard chip set 103.
The video card 104 is connected to the CPU 101 via an AGB (Accelerated Graphics Port) and a motherboard chip set 103.
The HDD 111 is connected to the CPU 101 via a PCI (Peripheral Component Interconnect) bus and the motherboard chip set 103.

  The optical drive 121 is connected to the CPU 101 via a low-speed bus, a bridge circuit 112 of the low-speed bus and the PCI bus, the PCI bus, and the motherboard chip set 103. The keyboard 122 and the mouse 123 are also connected to the CPU 101 with the same connection configuration. The optical drive 121 is a drive that reads (or reads and writes) data by irradiating an optical disk with a laser beam, and corresponds to, for example, a CD-ROM drive, a DVD drive, or the like.

  FIG. 1 is merely an example schematically showing a hardware configuration of a computer in which the CAE system according to the present embodiment is constructed. If this embodiment is applicable, various other configurations are adopted. Can do. In addition, the CAE system can be configured as a centralized type, a distributed type, or a stand-alone type as is well known.

  The CAE system is a so-called installation in which the CAE program recorded on the computer 100 is read from the optical drive 121, copied to the HDD 111, and copied to the main memory 102 so that the CAE program can be loaded (the installation described here is the installation). The CAE program is loaded into the main memory 102 and started when the user instructs the OS (Operating System) that controls the computer to start the CAE system.

[1.2 System components]
FIG. 2 is a module configuration diagram of the CAE system according to the present embodiment.
The CAE system according to the present embodiment includes a model data reading unit 11, a MinMaxBox creating unit 12, a vertex vector calculating unit 13, a component display determining unit 14, and a model data drawing unit 15.

  FIG. 3 shows an example of a three-dimensional model to be processed in the CAE system according to this embodiment. The three-dimensional model of this two-door type ordinary passenger car is shown from a perspective looking down from the front obliquely upward direction. Such a three-dimensional model of an ordinary passenger car includes not only the shell displayed in FIG. 3 but also a shell that can be displayed by changing the viewpoint such as the shell of the left side vehicle body that is not displayed, a front seat, a headrest, etc. It is composed of shells that cannot be displayed even if the viewpoint of interior parts is changed. It should be noted that here, it is not possible to display a part that can be seen through a transparent part such as a windshield or quarter glass. This is because when the analysis is performed by the CAE system, the display is made according to various types of analysis, and it is not always necessary to display a model that can be visually recognized in the real world. However, as will be described later, it is possible to have a mechanism for displaying a part that can be seen through the transparent part corresponding to the transparent part.

  In the CAE system of the present embodiment, a component consisting of only a shell that cannot be displayed even if the viewpoint is changed, that is, a component that is surrounded by other components in all directions is excluded from the display target and constitutes a three-dimensional model. Other parts are displayed. Since parts surrounded by other parts in all directions are covered with other parts, when viewed from the outside of other parts, the parts are inside even if the viewpoint direction and position are changed. I can't see it.

  FIG. 4 is an explanatory diagram of display determination processing for each component in the CAE system according to the present embodiment. In the component display determination process performed for each component, the MinMaxBox creation unit 12 creates a MinMaxBox of the component, the vertex vector of the MinMaxBox created by the vertex vector calculation unit 13 is obtained, and finally the vertex obtained by the component display determination unit 14 The component display determination is performed based on whether or not the vector intersects with another component other than the component to be processed. FIG. 4 shows a situation in which an intersection with another component is detected at each vertex with respect to a vector (x coordinate axis direction, x coordinate axis reverse direction) parallel to the x coordinate axis among the vertex vectors. All vertex vectors parallel to the x coordinate axis of the headrest shown in the figure intersect with the left door or the right door. Although not shown in FIG. 4, since the vertex vectors parallel to the y coordinate axis and the z coordinate axis also intersect with other parts, the headrest of the processing target part is not displayed as being surrounded by the other parts in all directions. It is determined.

  The model data reading means 11 has a function of reading model data designated by the user. In the CAE system, this model data corresponds to shell data. Shell data consists of normal nodes and elements for each shell (see FIG. 5A). A node is a point coordinate that constitutes a shell. When the shell is rectangular, the node is composed of four points. The model here is a shell model composed of shells. The shell in the shell data is divided into parts. Therefore, when a part is specified, the corresponding shell group can be specified, and the specified part is displayed by drawing the shell group and outputting it to the display device 131. Although the shell model has been described here, the present embodiment can be applied to a solid model. This is because the solid model is merely added with information on which side of the solid model is present compared to the shell model. In the CAD system, the shell model corresponds to a surface model.

  The MinMaxBox creating means 12 is a rectangular parallelepiped containing a part composed of a part shell, and any long side constituting the part is parallel to any coordinate axis (x axis, y axis, z axis). It has a function to create a MinMaxBox. MinMaxBox is sometimes referred to as a bounding box, and is an extension of extents used in two dimensions to three dimensions. The MinMaxBox itself consists of eight coordinates, and from the set of coordinates of the shell that constitutes a part, the minimum point of the x coordinate, the minimum point of the y coordinate, the minimum point of the z coordinate, the maximum point of the x coordinate, the maximum point of the y coordinate, The maximum point of the z coordinate is obtained, and these are used to identify the MinMaxBox of the part.

・ (Minimum point of x coordinate, minimum point of y coordinate, minimum point of z coordinate)
・ (Minimum point of x coordinate, minimum point of y coordinate, maximum point of z coordinate)
・ (Minimum point of x coordinate, maximum point of y coordinate, minimum point of z coordinate)
・ (Minimum point of x coordinate, maximum point of y coordinate, maximum point of z coordinate)
・ (Maximum point of x coordinate, minimum point of y coordinate, minimum point of z coordinate)
・ (Maximum point of x coordinate, minimum point of y coordinate, maximum point of z coordinate)
・ (Maximum point of x coordinate, maximum point of y coordinate, minimum point of z coordinate)
・ (Maximum point of x coordinate, maximum point of y coordinate, maximum point of y coordinate)

  The vertex vector calculation means 13 has a direction vector from the connection vertex to the processing target vertex using the MinMaxBox processing target vertex and the connection vertex connected to the processing target vertex on one side, and a half line starting from the processing target vertex It has the function which calculates | requires the vertex vector which is. The coordinates obtained by the MinMaxBox creation means 12 are used as the coordinates of each vertex. That is, a straight line equation is obtained from the two coordinates of the processing target vertex and the connection vertex using a straight line equation in space. However, the half line whose starting point is the processing target vertex is the vertex vector. In addition, since each side of MinMaxBox is parallel to one of the coordinate axes, the direction vector of the vertex vector is x-axis direction, x-axis reverse direction, y-axis direction, y-axis reverse direction, z-axis direction, z-axis Either of the opposite directions. Since the vertex vector does not point in various directions, the direction vector of the vertex vector does not need to be obtained through coordinate calculation. Thereby, the horizontal direction, the vertical direction, and the depth direction of MinMaxBox are not miscellaneous, and the component display determination can be performed stably. For example, the MinMaxBox horizontal direction, vertical direction, and depth direction for one component are different from the MinMaxBox horizontal direction, vertical direction, and depth direction for other components, and are similarly different for each component. In some cases, an erroneous part display determination is made in a part group located in a certain region, and a plurality of parts that are not partially covered may not be displayed.

  FIG. 6 is an explanatory diagram of vertex vectors according to this embodiment. MinMaxBox is a rectangular parallelepiped, and three sides intersect at the vertex (see FIG. 6A). There are three connection vertices connected through three sides connected to the processing target vertex. A direction vector from the coordinates of the connection vertex to the coordinates of the processing target vertex is calculated (see FIGS. 6B and 6C). A vertex vector that is a half line is obtained from the calculated direction vector and the processing target vertex. Three vertex vectors are obtained at each vertex, and the total number of vertices of the MinMaxBox, which is a rectangular parallelepiped, is 8, so 24 vertex vectors are obtained (see FIG. 6D). Here, the calculation method of the direction vector of the vertex vector has been explained. In the present embodiment, since the direction vector that the vertex vector can take is the coordinate axis direction and the coordinate axis reverse direction as described above, two coordinates in the three-dimensional space are used. There is no need to ask for. For example, at a vertex 7 composed of (the maximum point of the x coordinate, the maximum point of the y coordinate, and the minimum point of the z coordinate), the direction vector of the vertex vector is determined in the x axis direction, the y axis direction, and the z axis reverse direction. The same applies to the other vertices. In this embodiment, the vertex vectors on all the vertices of MinMaxBox are obtained and used, but the vertex vectors of some vertices, some vertex vectors, or some vertex vectors of some vertices are used. Display determination processing may be executed.

  The component display determination unit 14 has a function of determining whether or not to display depending on whether or not there is an intersection between the vertex vector obtained by the vertex vector calculation unit 13 and another component. The fact that all vertex vectors from each vertex of the MinMaxBox intersect with another part means that the part is covered with the other part. The determination result of the component display determination unit 14 is component display determination data including a list having the fields of the component identification information and the display determination flag shown in FIG. FIG. 5C shows a specific example of the component display determination data. In FIG. 5 (c), the display determination flag is set on the headrest and the front seat, which are interior parts in a normal passenger car, and is not displayed.

  The model data drawing unit 15 has a function of drawing and drawing only the data of the component to be displayed by the component display determination unit 14 from the read model data. That is, the model data drawing means 15 draws only the parts for which the display determination flag is not set as display target parts with reference to the part display determination data.

[2. Operation]
FIG. 7 is an operation flowchart of display processing in the CAE system according to the present embodiment.
When the user activates the CAE system and designates a file name of shell data, the model data reading means 11 loads the model data designated by the user from the HDD 111 to the main memory 102 (step S100).

The MinMaxBox creating unit 12 regards the shell data loaded by the model data reading unit 11 as a processing target for each part, and sets the minimum point of the x coordinate, the minimum point of the y coordinate, and the z coordinate from the set of shell coordinates in the processing target part. , The maximum point of the x coordinate, the maximum point of the y coordinate, and the maximum point of the z coordinate are obtained, and the coordinates of the vertices of the MinMaxBox are obtained using these coordinates (step S105).
The processing from step S115 to step S140 included from step S110 to step S145 indicating the loop processing is repeated for the number of parts.

  The vertex vector calculation means 13 calculates all vertex vectors using the coordinates of the MinMaxBox vertices obtained by the MinMaxBox creation means 12 (step S115). Since MinMaxBox has 8 [vertices] vertices and 3 vertex vectors are obtained for each vertex, 24 vertex vectors are obtained for each part.

  The processing from step S125 to step S135 included in steps S120 to S140 indicating the loop processing is repeatedly performed for the number of vertex vectors for the processing target component.

  The component display determination means 14 determines whether or not the vertex vector currently being processed has an intersection with another component (step S125), and determines that it does not have an intersection with another component. Advances to step 145 and returns to step S110. By doing so, the next part is the processing target, and the previous part is the display target because the display determination flag is not raised.

  If it is determined in step S125 that there is an intersection with another component, the component display determination unit 14 determines whether or not the processing target vertex vector in the processing target component is the last vector (step S130). If it is determined that the vector is the last vector, the component display determination unit 14 sets a display determination flag for the processing target component (step S135), and the process proceeds to step S140. If it is determined that it is not the last vector, the process proceeds directly to step S140. Here, the last vector indicates a vertex vector to be processed in a case where a vertex vector that can be processed has been subjected to component display determination processing excluding the vertex vector to be processed.

  The model data drawing unit 15 refers to the component display determination data, and creates drawing data composed of components for which the display determination flag is not set by the component display determination unit 14 among the loaded model data (step S150). The created drawing data is displayed on the display device 131 (step S155). That is, for the parts with the display determination flag set, the drawing data is not created without performing the drawing process. Therefore, when the display device 131 displays the parts according to the drawing data, the parts with the display determination flag set are not displayed.

  The three-dimensional model designated by the user is displayed on the display device 131 as described above. In the subsequent processing, the user may change the viewpoint. When the change of the viewpoint is accepted, the process does not start again from step S100 or step S105, but the part display determination data has already been obtained for the current three-dimensional model, and thus the processing from step S150 is performed. That is, the drawing data after changing the viewpoint only for the component to be displayed in the component display determination data is created and displayed.

[3. Effects of this embodiment]
As described above, according to the CAE system according to the present embodiment, the drawing data is created by not displaying the parts surrounded by other parts in all directions but using the parts not covered in all directions by other parts as the display targets. Since the drawing data is created and displayed for the display target parts that have already been obtained repeatedly, the display processing technology is displayed in comparison with the display processing technology that identifies and displays the displayed parts each time the viewpoint is changed. An excellent drawing response can be obtained by reducing the processing load. Note that the technique described in the three-dimensional image generation system of Patent Document 2 can also be applied after specifying the display target component according to the present embodiment.

  In the present embodiment, the obtained component display determination data can also be recorded. For example, the component display determination data is recorded by recording as model data attribute information and loading in the same manner when the model data is read. Subsequent display by reading the model data can shift to creation / display of drawing data without going through the processing of step S105 to step S145, so that a three-dimensional model can be displayed at high speed. Furthermore, the update of the component display determination data is necessary when the shape change of the component occurs, and it is desirable to execute the processing from step S105 to step S145 after the shape change of the component is made. However, since the part display determination process while the user is editing the shape of the part becomes complicated, the shape of the part can be changed when the model data is saved, when the model data is unloaded, or when the CAE system ends. It is desirable to execute the accompanying part display determination process. It is preferable to display all the parts instead of executing the display process using the part display determination data before the update until the part display determination process is started after the part shape editing is started. It is.

  In this embodiment, the MinMaxBox is created for each component and the display determination process is performed. However, the MinMaxBox can be created and the display determination process can be performed for a unit such as a unit or an assembly in which the parts are assembled. Model design using assemblies is implemented in particular on CAD systems. In this way, when performing part display determination processing not only in parts, but also in units and assemblies, in principle, it is executed in parts, and for units and assemblies specified by the user, the unit, It is not executed in units of parts included in the assembly, but is executed in units of units or assemblies.

(Other embodiments)
[Response to transparent parts]
In the first embodiment, the parts to be processed in which all the vertex vectors intersect with other parts, including the case where the vertex vector intersects with a transparent part such as a window glass, are not displayed. It is also possible to adopt a configuration in which the intersection between the vector and a transparent part such as a window glass is not an intersection with another part. By doing so, in the case of processing a part that includes a vertex vector that intersects only with a transparent part such as a window glass and other vertex vectors do not intersect with other parts, The intersection of the vertex vectors means that the vertex vector does not intersect with other parts, and the parts that are not displayed become the parts to be displayed.

[Specify display]
In the first embodiment, all the parts in the shell data are displayed as processing targets except for the parts inside. However, the presence or absence of display of the parts in the shell data may be received from the user. In this case, it is possible to cope with the problem by using the component display determination processing target except the component designated by the user. A component that is not a processing target for component display determination is not only a processing target component, but is not handled as another component in step S125. Therefore, for example, in the case of the two-door type normal passenger car model in FIG. 3, when the user specifies that the windshield is not displayed, if the windshield is displayed, the interior items such as headrests that are not subject to display are displayed. Is also displayed. By obtaining the component display determination data and recording it in association with the display designation by the user, even if the user specifies the same display next time, the display determination data is not obtained again. Processing can be performed at high speed using the recorded component display determination data corresponding to the designation. In addition, when creating a 3D model by dividing a part into multiple sheets using a layer (Layer), only the parts belonging to the displayed sheet should be processed according to whether or not each sheet is displayed. You can also. Then, by recording the component display determination data obtained in association with the layer, the next process can be executed at high speed.

  Further, the processing for obtaining the component display determination data after the designation of the display of the components may be executed for each designation of the display of one component, or when the user collectively designates the display of the components. Executed after completion of designation of display of the part.

[Extension of vertex vector]
In the first embodiment, as shown in FIG. 8A, whether or not to display is determined depending on whether or not the vertex vector of MinMaxBox intersects with other parts other than the processing target part. Here, it is also possible to use vertex vectors in various directions in the global direction around the vertex of the MinMaxBox as shown in FIG. 8B in which the vertex vector according to each coordinate axis according to the first embodiment is expanded. . For example, it is possible to specify a component to be displayed without error enough to increase the vertex vectors provided at equal angular intervals on the entire globe, but the processing for obtaining the component display determination data increases as the vertex vector increases. It becomes. In addition, it is necessary to process by removing the vertex vectors passing through the MinMaxBox of the processing target component from the global vertex vectors. Otherwise, not only will the intersection with the processing target part occur, but the intersection with the other part will be searched for in the same direction as the vertex vector at the other vertex in the processing target part, resulting in substantially overlapping processing. It is. Here, examples of parts that should not be displayed erroneously when the number of vertex vectors is small include parts having cavities in a lattice shape and models in which spaces are not closed. Even such a model can be determined without error by increasing the number of vertex vectors for determining component display. In addition, as in the first embodiment, as the direction vector of the vertex vector for a vertex having one processing target part matches the direction vector of the vertex vector for the corresponding vertex of another processing target part, Even in the case of a vertex vector, it is desirable that the direction vector of a vertex vector for a certain vertex in one processing target component matches the direction vector of the vertex vector for a corresponding vertex in another processing target component. That is, the global vertex vector shown in FIG. 8B is used as a template global spherical vector, and the global vertex vector of this template is translated to obtain a vertex vector at each vertex.

  Although the present invention has been described with the above embodiments, the technical scope of the present invention is not limited to the scope described in the embodiments, and various modifications or improvements can be added to these embodiments. . And embodiment which added such a change or improvement is also contained in the technical scope of the present invention. This is apparent from the claims and the means for solving the problems.

It is a hardware block diagram of the computer which concerns on the 1st Embodiment of this invention. It is a module block diagram of the CAE system which concerns on the 1st Embodiment of this invention. It is an example of the model of the display object of the CAE system which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the display determination in the component unit in the CAE system which concerns on the 1st Embodiment of this invention. It is the shell data and component display determination data which the CAE system which concerns on the 1st Embodiment of this invention uses. It is derivation explanatory drawing of the vertex vector used for display judgment concerning a 1st embodiment of the present invention. It is an operation | movement flowchart of the display process in the CAE system which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the vertex vector used for the display determination which concerns on other embodiment of this invention, and its expansion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Model data reading means 12 MinMaxBox creation means 13 Vertex vector calculation means 14 Component display determination means 15 Model data drawing means 100 Computer 101 CPU
102 Main memory 103 Motherboard chipset 104 Video card 111 HDD
112 Bridge circuit 121 Optical drive 122 Keyboard (which is an input device) 123 Mouse (which is an input device) 131 Display device

Claims (7)

A three-dimensional model display device for displaying a three-dimensional model composed of a plurality of read parts,
MinMaxBox creating means for creating a MinMaxBox that encloses one part of a three-dimensional model composed of a plurality of read parts in a rectangular shape;
The processing vertex of the rectangular MinMaxBox created by the MinMaxBox creation means is the starting point of the processing target vertex with a direction vector from the connected vertex that is a vertex connected via one side to the processing target vertex. A vertex vector calculation means for calculating a vertex vector that is a half line, and
It is determined whether the vertex vector of each vertex of the MinMaxBox calculated by the vertex vector calculation means intersects with other parts other than the processing target part, and it is determined that all vertex vectors intersect with other parts. A three-dimensional model display device including a component display determination unit that does not display the processing target component when the processing is performed. The component display determination data indicating a component that is not displayed by the component display determination unit and / or a component that is displayed excluding the component that is not displayed is recorded in association with the three-dimensional model to be processed. The three-dimensional model display device described in 1. The three-dimensional model display device according to claim 1, wherein each side of the rectangular MinMaxBox created by the MinMaxBox creating unit is parallel to one of coordinate axes of a coordinate space of a model to be processed. Among the parts constituting the three-dimensional model, the parts designated for display are set as the parts to be processed by the MinMaxBox creating means,
The parts that are not designated for display are not considered as parts other than the parts to be processed by the part display determination means,
The three-dimensional model display device according to claim 1, wherein a part not designated for display is not displayed because a part not designated for display is not set as a part to be processed by the MinMaxBox creation unit. The three-dimensional model display according to claim 1, wherein a transparent part among the parts constituting the three-dimensional model is not set as another part to be compared with the part to be processed by the part display determination unit. apparatus. A three-dimensional model display program for displaying a three-dimensional model consisting of a plurality of read parts on a computer,
MinMaxBox creating means for creating a MinMaxBox that encloses one part of a three-dimensional model composed of a plurality of read parts in a rectangular shape;
The processing vertex of the rectangular MinMaxBox created by the MinMaxBox creation means is the starting point of the processing target vertex with a direction vector from the connected vertex that is a vertex connected via one side to the processing target vertex. A vertex vector calculation means for calculating a vertex vector that is a half line, and
It is determined whether the vertex vector of each vertex of the MinMaxBox calculated by the vertex vector calculation means intersects with other parts other than the processing target part, and it is determined that all vertex vectors intersect with other parts. A three-dimensional model display program for causing a computer to function as a component display determination unit that does not display a processing target component in the case where the processing target component is displayed. A three-dimensional model display method for displaying a three-dimensional model composed of a plurality of read parts using a computer,
A MinMaxBox creation step for creating a MinMaxBox that encloses one part of a three-dimensional model composed of a plurality of read parts in a rectangular shape;
The processing target vertex of the rectangular MinMaxBox created in the MinMaxBox creation step is the starting point of the processing target vertex with a direction vector from the connected vertex that is a vertex connected through one side to the processing target vertex. A vertex vector calculating step for calculating a vertex vector that is a half line;
It is determined whether or not the vertex vector of each vertex of the MinMaxBox calculated in the vertex vector calculation step intersects with other components other than the processing target component, and it is determined that all the vertex vectors intersect with other components. A three-dimensional model display method including: a component display determination step in which a processing target component is not displayed in the case of being performed.