JP2008242610A - Three-dimensional model display device, three-dimensional model display method, and three-dimensional model display program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional model display device for achieving the improvement of the operating efficiency of a user by displaying only constituting elements intended by a user, and not by displaying unnecessary constituting elements. <P>SOLUTION: A three-dimensional model display device 100 for displaying constituting elements constituting the model of a three-dimensional structure is provided with a display candidate selection processing part 206 for, when even a portion of the constituting elements of the model are included in a designated space corresponding to a designated region designated by a user with respect to the displayed model, defining the constituting elements as the candidate of a display object, and for, when the constituting elements of the model are not included at all, defining the constituting elements as a non-display object; a volume calculation processing part 208 for calculating the including rate of the volume of the constituting elements in the designated space to the volume of each of the constituting elements as the candidate; and a decision processing part 210 for comparing the inclusion rate with a preliminarily set threshold, and for deciding whether or not the constituting elements should be defined as the display object. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a three-dimensional model display device, a three-dimensional model display method, and a three-dimensional model display program for displaying only a component intended by a user among components constituting a model drawn in three dimensions.

When a part of the constituent elements constituting the model drawn in three dimensions in the three-dimensional model display device is enlarged and displayed, if the constituent element to be enlarged and displayed constitutes the outer surface of the model, By instructing the component to enlarge and display the region that the user wants to watch, the three-dimensional model display device enlarges and displays the designated region.
Here, a conventional method for displaying some of the components of a model drawn in three dimensions will be described with reference to the drawings. FIG. 9 is a schematic diagram showing a conventional technique for displaying the components of the model.

  In FIG. 9A, when it is desired to display only the sheet arranged in the model 401, when an area 403 including a position where the sheet will be present is designated by a mouse operation or the like, it is shown in FIG. 9B. Thus, the inner sheet is not displayed and only the door is enlarged and displayed. This occurs because the view of the seat placed inside the model 401 is blocked by the front door.

  Therefore, in order to display only the sheet arranged inside the model 401, the following operation is required. In FIG. 9C, a door area 403 that is considered to have a seat in the depth direction is selected as a rectangle, and only the components included in the space corresponding to the rectangular area are displayed. Here, when a rectangle is selected in a three-dimensional model space, the depth direction is selected to be infinite. Therefore, as shown in FIG. 9D, only the left door 406, the seat 404, and the right door 405 are displayed. Then, by selecting and hiding the left door 406 and the right door 405, respectively, only the sheet 404 can be displayed on the screen.

  As a method different from these series of user instructions, the following operation may be performed. First, a front area of a normal passenger car such as a front wheel and a front panel is selected in a rectangular shape, and components in the rectangular area are hidden. As described above, when the rectangle is selected in the three-dimensional model space, the depth direction is selected at infinity, so components such as the engine and the radiator inside the depth space corresponding to the front area are also hidden. . Similarly, the rear area is selected as a rectangle, and the components in the depth space corresponding to this rectangular area are hidden. If the process of hiding these components is smooth and only the left door, seat, and right door are displayed, select the left and right doors and hide them as in the above method. By doing so, only the sheet can be displayed on the screen.

Furthermore, there is a technique disclosed in Patent Document 1 as a technique that can display an internal structure of a three-dimensional shape in an apparatus that displays a three-dimensional shape model. The three-dimensional shape support apparatus disclosed in Patent Document 1 includes a three-dimensional shape data storage unit that holds shape data of a three-dimensional shape model, and an input unit that inputs a partial region of the displayed three-dimensional shape model and display change information. A selection unit that extracts a three-dimensional shape model existing in the partial region from the three-dimensional shape data storage unit, and a display state of the three-dimensional shape model extracted by the selection unit according to the display change information. A display setting unit to be changed and a display unit to display the three-dimensional shape model in the display state changed by the display setting unit. According to this, it is possible to display the internal structure of the three-dimensional shape model in an easy-to-understand manner for the user.
JP 2007-25929 A

However, when only the region of the component to be watched is displayed on the screen as described above, it is very troublesome because the user must set the other components to non-display.
In addition, when a space including a component to be watched is specified, as described above, normally, an unnecessary component that does not need to be displayed is included. Therefore, the user hides the component that does not need to be displayed. Operation has to be performed, and it has the subject that it becomes the work which requires a lot of time.

  By the way, although the technique shown in the Patent Document 1 displays the internal structure of the three-dimensional shape model of the part to be watched instructed by the user in an easy-to-understand manner, the Patent Document 1 also solves the problem. It does not lead to.

  Therefore, the present invention has been made to solve the above-described problem, and the user can improve the work efficiency of the user by displaying only necessary components and hiding unnecessary components. An object of the present invention is to provide a three-dimensional model display device, a three-dimensional model display method, and a program capable of causing a computer to execute the three-dimensional model display method.

(1. Judged by volume coverage)
The three-dimensional model display device according to the present invention is a three-dimensional model display device that displays a part or all of the components constituting a model of a three-dimensional structure, and a user designates the displayed model. If the specified space corresponding to the specified area includes at least part of the model component, the component is selected as a candidate for display, and if the model component is not included at all, the component is not displayed. Candidate selection means to be displayed, calculation means for calculating an inclusion rate of the volume of the component in the designated space with respect to each volume of the component that is selected by the candidate selection means as the display target, and the calculation A determination unit that compares the inclusion ratio corresponding to each component calculated by the unit with a preset threshold value to determine whether the component is to be displayed; Equipped with a.

As described above, in the present invention, even if the component to be displayed is covered with the inside of the model or other components, the space corresponding to the area designated by the user (hereinafter referred to as the designated space). In order to determine whether a component is a display target from the volume coverage of the component in the specified space with respect to the volume of each component included in the user, the user only specifies the area and intends the component Only can be displayed easily. Therefore, the user's work efficiency can be improved.
The coverage of each component in the specified space is calculated by the following formula.
Inclusion rate = (volume of each component in the specified space) / (volume of each component)

(2. Set threshold)
The three-dimensional model display device according to the present invention is the three-dimensional model display device according to claim 1, wherein a threshold value setting unit that sets the preset threshold value based on a user instruction, and the calculation unit includes: Re-judgment means for re-determining whether or not the component element is to be displayed by comparing the calculated inclusion ratio corresponding to each component element and the threshold value set by the threshold value setting means.

  As described above, in the present invention, the user changes the threshold value, and re-determines whether to display or not display the component according to the changed value. By this, even if the user cannot select the designated space strictly and an unnecessary component is displayed, or even if a necessary component is not displayed, by changing the threshold, Only the components necessary for the user can be easily displayed.

(3. Adjustment of display size)
The three-dimensional model display device according to the present invention is the three-dimensional model display device according to claim 1 or 2, wherein the component to be displayed is drawn in accordance with a size of the designated area designated by a user. The drawing means is provided.
As described above, in the present invention, only necessary components are displayed in accordance with the size of the area specified by the user, so that the area that the user wants to watch can be displayed in an enlarged or reduced display. It has the effect of being able to.

(4. Change display size)
The three-dimensional model display device according to the present invention is the three-dimensional model display device according to claim 3, wherein the size of the designated region can be changed even after the drawing unit has drawn the component. It is characterized by that.

  Thus, in the present invention, the size of the designated area can be changed even after the constituent elements are displayed in accordance with the size of the area designated by the user. Therefore, even when only a part of the constituent elements are designated and displayed when the initial area is designated, the designated area can be changed and the whole can be displayed. The reverse is also possible.

  Although the present invention has been described as an apparatus, the present invention can be understood as a system, method, and program as will be apparent to those skilled in the art. 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.

  Embodiments of the present invention will be described below. The present invention can be implemented in many different forms. Therefore, the present invention should not be construed based only on 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 apparatus will be mainly described. However, as is apparent to those skilled in the art, the present invention can also be implemented as a system, a method, and a program for operating a computer. In addition, the present invention can be implemented in hardware, software, or hardware and software 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.

(First embodiment of the present invention)
[1. Constitution]
[1.1 Hardware configuration]
FIG. 1 is a schematic diagram of a hardware configuration of a three-dimensional model display device according to the present embodiment.
The three-dimensional model display device 100 includes a CPU (Central Processing Unit) 101, a main memory 102, an external storage device 103, an input device 104, and an output device 105.

  The CPU 101 performs actual processing according to the program. The main memory 102 temporarily stores programs and data. The external storage device 103 is a storage device such as a hard disk, for example, and stores programs and data. The input device 104 is, for example, a mouse or a keyboard, and a user can input data and instructions using these devices. The output device 105 is a display, for example, and can be visually recognized by the user by outputting the three-dimensional model to the display. All these devices are connected via a bus 110.

Note that FIG. 1 is merely an example schematically showing the hardware configuration of the three-dimensional model display device according to the present embodiment, and other configurations can be adopted as long as the present embodiment can be realized.
The three-dimensional model display device 100 is a so-called installation (described here) in which a three-dimensional model display program is copied to an external storage device 103 having a hard disk and the copied three-dimensional model display program can be loaded into the main memory 102. Installation is only an example). Then, when the user instructs the OS (Operating System) that controls the computer to start the three-dimensional model display device, the three-dimensional model display program is loaded into the main memory 102 and started.
The three-dimensional model display program may be provided from a recording medium such as a CD-ROM, or may be provided from another computer via a network.

[1.2 Components]
FIG. 2 is a module configuration diagram of the three-dimensional model display device according to the first embodiment of the present invention.
The three-dimensional model display device 100 includes a processing control device 200, an input unit 220, an output unit 230, and a storage unit 240. The processing control apparatus 200 includes a model data reading processing unit 202, a space setting processing unit 204, a display candidate selection processing unit 206, a volume calculation processing unit 208, a determination processing unit 210, and a drawing unit 212.

  The model data reading processing unit 202 performs processing for reading data of a model to be displayed. In response to an instruction from the user, data of a model to be displayed is read and the model is displayed on the screen.

  The space setting processing unit 204 performs processing for setting a space corresponding to the rectangular area specified by the user as the specified space. For example, when the user selects a rectangular area on the screen for the model read by the model data reading processing unit 202, the designated space in the depth infinity direction corresponding to the rectangular area is the target space to be set It becomes.

  The display candidate selection processing unit 206 selects candidates for model components (hereinafter referred to as objects) to be displayed. If any part of the object is included in the designated space set by the space setting processing unit 204, the object is a candidate for display. On the other hand, objects that are not included in the designated space are hidden.

  Note that a boundary determination technique for determining whether or not an object is included in a designated space is well known, and those skilled in the art can design and implement it as appropriate.

  The volume calculation processing unit 208 includes the volume of each object constituting the model, the volume of the object in the space designated by the space setting processing unit 204, and the ratio of the volume of the object in the designated space to the volume of each object (hereinafter referred to as “volume”). , The inclusion rate).

  The volume of each object constituting the model may be calculated when the model data reading processing unit 202 reads the object, and may be held for each object as attribute data. The volume calculation unit may be any meaningful unit such as a component unit, a unit unit, or an assembly unit. Furthermore, meaningful group units may be arbitrarily set according to user instructions.

  As a volume calculation method, when roughly calculating the volume of an object, it can be calculated by BOX calculation of 8 vertices covering the object. In this case, irregularities and holes are neglected volume values. When the volume of an object is strictly calculated, the volume can be calculated in units of closed solids that can be calculated, and the sum of each can be obtained as the volume of the object. In addition, the volume can be calculated using a well-known general volume calculation method.

The determination processing unit 210 performs a process of determining whether to display an object on the screen by comparing the inclusion rate calculated by the volume calculation unit 208 with a preset threshold value. The objects that are candidates for display in the display candidate selection processing unit 206 are compared with their inclusion rates and threshold values. For objects whose inclusion rates are equal to or higher than the threshold values, the display flag is set to ON and the objects are displayed.
The drawing unit 212 performs processing to output only the objects whose display flag is set to ON by the determination processing unit 210 to the output unit 230. As a result, only the object to be displayed is displayed on the screen, improving the user's work efficiency.

[2 operation]
The operation of the three-dimensional model display device in the first embodiment of the present invention will be described. FIG. 3 is a flowchart showing processing of the three-dimensional model display device according to the first embodiment of the present invention.
First, the model data read processing unit 202 in FIG. 2 performs a process of reading model data (step S301). As a result, the model that the user is working on is initially displayed on the screen. Next, the volume calculation processing unit 208 in FIG. 2 performs a volume calculation process on all the objects constituting the initially displayed model (step S302). The volume data calculated here may be held as data in a temporary area, or may be held as attribute data of an object as described above. Next, the space setting processing unit 204 in FIG. 2 performs a process of setting a space in the depth infinity direction corresponding to the rectangular area on the screen selected by the user as the designated space (step S303).

  The display candidate selection processing unit 206 in FIG. 2 determines whether or not some of the objects are included in the space designated in step S303 (step S304). An object that is not included in the designated space is not a display target, and the process proceeds to a process of determining the next object (proceeds to NO in step S304). For an object that is partly included in the designated space, the volume of the part of the object included in the designated space is calculated by the volume calculation processing unit 208 in FIG. 2 (step S305). Next, the inclusion rate is calculated from the volume of each object calculated in advance and the volume of the object in the portion included in the designated space (step S306). The calculated inclusion rate is compared with a preset threshold value (step S307). If the inclusion rate is equal to or greater than the threshold value, the display flag is set to ON for the object (step S308), and the inclusion rate is If it is smaller than the threshold value, the display flag for the object remains the initial value (OFF). The processing from step S304 to step S308 is repeated for all the objects constituting the model data.

  In the size comparison in step S307, if the inclusion rate is equal to or greater than the threshold value, the display flag is set to ON for the object, and if the inclusion rate is less than the threshold value, the display flag remains at the initial value for the object. However, the reverse is also possible.

When the processing from step S304 to step S308 is completed for all objects, drawing is performed only for the objects for which the display flag is ON (step S309), and the processing is terminated after being displayed on the screen.
As for the drawing of the object, in the above description, only the object whose display flag is ON is drawn using the display flag. However, the object which is the display target as a result of the comparison in step S307 without using the display flag. May be drawn sequentially.

[3. Determine display object]
A process of determining an object to be displayed will be described in more detail with reference to FIG. FIG. 4 is a schematic diagram showing a process of determining a display object.
Here, a process of determining a display object when displaying the sheet 404 arranged inside the model 401 will be described. FIG. 4A is a perspective view of the model displayed on the screen. The user predicts the position of the sheet 404 arranged inside and designates the rectangular area 403. A space 402 in the depth infinity direction corresponding to the rectangular area 403 is specified for the specified rectangular area 403.

  FIG. 4B shows all the objects (here, the seat 404, the right door 405, and the left door 406) that are partly included in the designated space 402. The selected object is an object that is a display candidate. The coverage is calculated from the volume of each object and the volume of each selected object in the space 402 (here, the seat 404 is 0.9, and the right door 405 and the left door 406 are 0.6). Here, if the preset threshold value is 0.8, the inclusion rate of each object is compared with the threshold value, and only the sheet 404 whose inclusion rate is equal to or greater than the threshold value is displayed (FIG. 4C). .

[4. Enlarged display object]
Further, only the sheet 404 can be enlarged and displayed by performing an enlargement operation by applying the present invention. FIG. 5 shows a schematic diagram when an enlargement operation is performed by applying the present invention.
FIG. 5A is a side view of the model 401. As described above, the user predicts the position where the sheet 404 is arranged and designates the rectangular area 403. Then, the same processing as that shown in FIG. 4 is performed, and only the sheet 404 is displayed on the screen (FIG. 5B). At that time, only the sheet 404 is enlarged and the doors arranged on the left and right are not displayed. At this time, the object is displayed in accordance with the size of the rectangular area 403 specified by the user. Furthermore, as shown by the arrow in FIG. 5B, the entire sheet 404 can be displayed by changing the size of the rectangular area 403 even after the object is displayed.

  As described above, according to the present embodiment, only the object that the user wants to display can be easily displayed on the screen with respect to the object in which the object to be selected is arranged in a position that is difficult to select in the model or on the screen. Can be displayed. In addition, it is possible to enlarge only the object that is desired to be displayed at that time.

Note that it is easy for a normal engineer when selecting a rectangular area to predict the position of a sheet that is not visible on the screen arranged inside the model. It is difficult for a person other than the engineer to predict the position of the seat. Therefore, the interior of the model may be displayed transparently using a wire frame model or a surface model.
In FIG. 5B, the display area may be automatically changed so that the entire display target is displayed in accordance with the size of the display target (here, the sheet 404).

(Second embodiment of the present invention)
[1. Constitution]
[1.1 Hardware configuration]
In the second embodiment of the present invention, the hardware configuration of the apparatus is the same as that of the first embodiment, and the description thereof is omitted.

[1.2 Components]
FIG. 6 is a module configuration diagram of the three-dimensional model display device according to the second embodiment of the present invention.
The three-dimensional model display device 100 includes a processing control device 200, an input unit 220, an output unit 230, and a storage unit 240. The processing control apparatus 200 includes a model data reading processing unit 202, a space setting processing unit 204, a display candidate selection processing unit 206, a volume calculation processing unit 208, a threshold setting unit 209, a determination processing unit 210, and a drawing unit. 212.

  The functions of the model data reading processing unit 202, the space setting processing unit 204, the display candidate selection processing unit 206, the volume calculation processing unit 208, the determination processing unit 210, and the drawing unit 212 are the same as those in the first embodiment. I will omit it.

The threshold setting unit 209 performs processing for setting an arbitrary threshold value designated by the user. By this process, when there are a plurality of objects to be displayed or an object that is necessary is not displayed, the user can selectively display an object that the user wants to display.
Note that the drawing unit 212 performs a drawing process at the same time when the threshold value is set in the threshold setting unit 209, so that the user can display or hide the object in real time according to the setting of the threshold value. it can.

[2 operation]
The operation of the three-dimensional model display device in the second embodiment of the present invention will be described. FIG. 7 is a flowchart showing the processing of the three-dimensional model display device according to the second embodiment of the present invention.
Steps S301 to S309 are the same as those in the first embodiment, and are therefore omitted. In step S309, only the display target object is displayed on the screen. While viewing the screen, the user checks whether any unnecessary objects are displayed or objects that need to be displayed are hidden. If there are objects to be displayed, set the threshold value. You can make changes and make adjustments. In step S310, it is determined whether the threshold has been changed. If the threshold value has not been changed, the process is terminated as it is. When the threshold value is changed, a process of comparing the newly set threshold value with the size of the inclusion rate is performed again for an object (an object to be a candidate for display) partially included in the designated space (step) S311). If the coverage is greater than or equal to the threshold, the display flag is set to ON for that object (step S312), and if the coverage is less than the threshold, the display flag is set to OFF for that object (step S313). The processing from step S311 to this step is repeated for all objects that are candidates for display. When processing is completed for all objects that are candidates for display, drawing is performed only for objects for which the display flag is ON (step S314), and the processing is terminated after being displayed on the screen.

Note that, as described in the first embodiment, regarding the drawing of objects, the objects that are the display targets as a result of the comparison in step S307 or step S311 may be sequentially drawn.
Further, in the above, the processing from step S311 to step S313 is performed for all objects that are candidates for display (objects that are partly included in the designated space). The processing can be omitted for display candidate objects that can be determined not to be.

[3. Determination of display object when threshold is changed]
A process of determining an object to be displayed when the threshold value is changed will be described in more detail with reference to FIG. FIG. 8 is a schematic diagram showing a process of determining a display object when the threshold value is changed.

  As described in the first embodiment, when the threshold is set to 0.8, only the sheet 404 is displayed on the screen as a display target object as shown in FIG. Here, for example, it is assumed that the user wants to display the right door 405 and the left door 406 at the same time in order to know the relationship between the seat 404 and the right door 405 and the left door 406. In that case, the user changes the threshold value to 0.5 on the screen. By doing so, as shown in FIG. 8D, the seat 404, the right door 405, and the left door 406 are displayed on the screen, and it becomes possible to know the relationship between the three.

  Note that the threshold value may be set in a range of 0.5 to 0.8. Thereby, it is possible to display only the door. Also, the inclusion rate of each object that is a candidate for display (here, 0.6 of the right door 405 and left door 406 and 0.9 of the seat 404) and the object name are displayed on the screen, and the information is displayed. The user may be allowed to arbitrarily select the threshold value while watching. Further, as a method for setting the threshold value, it is sufficient that the value can be changed using a mouse and a keyboard on the screen such as a slide bar, direct input, and selection by a list box.

As described above, according to the present embodiment, the user can selectively display an object by changing the threshold value. Therefore, the screen display is in a state where the intention is more easily reflected by the user, and the work efficiency of the user can be improved.
In the above-described embodiment, a model is displayed in three dimensions using computer graphics technology, such as a CAD device or a molecular structure simulation device, and selection of objects constituting the model is accepted. Applicable to display devices.

  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 schematic diagram of the hardware constitutions of the three-dimensional model display apparatus which concerns on this embodiment. It is a module block diagram of the three-dimensional model display apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the process of the three-dimensional model display apparatus which concerns on the 1st Embodiment of this invention. It is the schematic diagram which showed the process of determining a display object. It is a schematic diagram at the time of enlarging operation by applying the present invention. It is a module block diagram of the three-dimensional model display apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the process of the three-dimensional model display apparatus which concerns on the 2nd Embodiment of this invention. It is the schematic diagram which showed the process in which a display object is determined when a threshold value is changed. It is the schematic diagram which showed the prior art which displays the component of a model.

Explanation of symbols

100 3D model display device 101 CPU
102 main memory 103 external storage device 104 input device 105 output device 110 bus 200 processing control device 202 model data read processing unit 204 space setting processing unit 206 display candidate selection processing unit 208 volume calculation processing unit 209 threshold setting unit 210 determination processing unit 212 Drawing unit 220 Input unit 230 Output unit 240 Storage unit 401 Model 402 Designated space 403 Designated area 404 Seat 405 Right door 406 Left door

Claims (6)

A three-dimensional model display device that displays part or all of the constituent elements constituting a three-dimensional structure model,
When a part of the model component is included in the designated space corresponding to the designated area designated by the user for the displayed model, the component is selected as a candidate for display, and the model component Candidate selection means for hiding the component when it is not included at all,
Calculating means for calculating an inclusion rate of the volume of the component in the designated space with respect to each volume of the component selected as a candidate for display by the candidate selection unit;
A three-dimensional comprising: determination means for comparing the inclusion rate corresponding to each of the component elements calculated by the calculation means and a threshold value set in advance to determine whether the component element is to be displayed Model display device. Threshold setting means for setting the preset threshold based on a user instruction;
A re-determination unit that re-determines whether the component is to be displayed by comparing the coverage ratio corresponding to each component calculated by the calculation unit and the threshold set by the threshold setting unit; The three-dimensional model display device according to claim 1.     The three-dimensional model display device according to claim 1, further comprising: a drawing unit that draws the component to be displayed in accordance with a size of the designated area designated by a user.     4. The three-dimensional model display device according to claim 3, wherein the size of the designated area can be changed even after the drawing unit has drawn the component. A three-dimensional model display method for displaying a part or all of constituent elements constituting a model of a three-dimensional structure,
When a part of the model component is included in the designated space corresponding to the designated area designated by the user for the displayed model, the component is selected as a candidate for display, and the model component A candidate selection step in which the component is not displayed when no
A calculation step of calculating an inclusion rate of the volume of the component in the designated space with respect to each volume of the component as a display target candidate in the candidate selection step;
A three-dimensional process comprising: a determination step of determining whether or not to include the component element as a display target by comparing the inclusion ratio corresponding to each component element calculated in the calculation step with a preset threshold value Model display method. A three-dimensional model display program for operating a computer to display part or all of the constituent elements constituting a three-dimensional structure model,
When a part of the model component is included in the designated space corresponding to the designated area designated by the user for the displayed model, the component is selected as a candidate for display, and the model component Candidate selection means for hiding the component in case that is not included at all,
Calculating means for calculating an inclusion rate of the volume of the constituent element in the designated space with respect to each volume of the constituent element selected as a display target candidate by the candidate selecting means;
To operate the computer as a determination unit that compares the inclusion rate corresponding to each component calculated by the calculation unit with a preset threshold value and determines whether the component is to be displayed 3D model display program.

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