JP3374140B2 - Geometric constraint display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geometric constraint condition display device for displaying geometric constraint conditions between respective multidimensional graphics when a multidimensional model is assembled on a multidimensional CAD.

[0002]

2. Description of the Related Art In order to assemble a three-dimensional model of a structure or the like using three-dimensional CAD, a method of directly specifying coordinate values on three-dimensional coordinates and defining points, lines, and surfaces is used. , The simplest. However, with this method, it is not possible to easily change the positional relationship between the solid bodies as the parts constituting the three-dimensional model. Therefore, conventionally, a method of defining a geometric constraint condition of a solid has been developed.

This method will be described in detail. A plurality of solid bodies as parts forming a three-dimensional model are defined by using three-dimensional coordinates that are independent of the coordinates of the space in which the three-dimensional model is assembled. deep. Next, of the solids defined in this way, a solid serving as a reference (hereinafter, referred to as a “reference solid”) is arranged at an arbitrary coordinate position in the above-mentioned space with an arbitrary direction. Then, when arranging another solid (hereinafter referred to as “constrained solid”) in this space,
A plurality of (generally 3 or more) geometric constraint conditions for the reference solid ("faces overlap each other", "lines match each other",
Etc.), the positioning is performed.

An example of the geometric constraint condition will be described with reference to FIG. FIG. 9 shows a state in which two solids 101 and 102 are defined in a space where a three-dimensional model is assembled. Now, it is assumed that the solid (cuboid) 101 is the reference solid. In this case, the relationship between at least the distance between the solids 101 and 102 and the planes forming the solids 101 and 102 is 2
If defined individually, the position and orientation of the solid (cuboid) 102 can be determined. Specifically, for example, "
The surface 1A of the solid 101 and the surface 2A of the solid 102 ride on the same plane.
"Surface 2B is on the same plane" and "Stereo 1"
The distance between the face 1C of 01 and the face 2C of the solid 102 is 10
It suffices to define the relation "is 0".

The following advantages can be obtained by using the method using such a geometric constraint condition. That is, if one of the minimum geometric constraint conditions necessary to determine the position and direction of the constrained solid is deleted, the constrained solid has one degree of freedom with respect to the reference solid. I will have. That is, the constrained solid can be displaced in the direction depending on this degree of freedom. Therefore, it is possible to determine a new position or posture between the solids simply by setting a new geometric constraint condition within the range of this degree of freedom. For example, the initial geometric constraint condition that was defined as "the surface 1A of the solid 101 and the surface 2A of the solid 102 are parallel planes" is "solid 101
The surface 1A of the solid and the surface 2A of the solid 102 are placed on the same plane. "Similarly, the position of the constrained solid can be changed by resetting the remaining constraint conditions. And the direction can be arbitrarily decided.

[0006]

However, in the conventional three-dimensional CAD system using such a geometric constraint condition, once the minimum necessary geometric constraint condition is set, the qualitative geometric constraint condition becomes , Was not displayed on the screen of the 3D CAD system. That is, as shown in FIG. 10, geometric constraint conditions that can be expressed as dimensions, such as “distance between faces” are displayed, but “faces overlap with each other” and “lines overlap with each other”. The qualitative geometric constraint conditions such as "match with" were not displayed on the screen.

Therefore, once the minimum required geometric constraint conditions have been set, it has not been possible to confirm what kind of geometric constraint conditions have been set. Therefore, after setting the geometric constraint conditions, it is not possible to select and edit only part of the set geometric constraint conditions, that is, delete or change the geometric constraint conditions.

[0008] Therefore, in the conventional three-dimensional CAD system, when the minimum required geometric constraint condition is once set and then the set geometric constraint condition is changed (even partly), all the set geometric constraints are set. Delete the constraint once,
It was necessary to set the geometric constraint conditions again (with new contents).

As described above, the conventional three-dimensional CAD system has a problem that the work efficiency for moving the solid body due to the change of the geometric constraint condition is low. The present invention is
In view of the above problems, it is easy to edit geometric constraint conditions,
An object of the present invention is to provide a geometric constraint condition display device capable of efficiently moving a multidimensional figure.

[0010]

The geometric constraint condition display device according to the present invention, as shown in FIG. 1, which is a principle diagram, is arranged to arrange a plurality of multidimensional figures (204) in a multidimensional space. A geometric constraint condition display device for displaying a geometric constraint condition for controlling the positions of respective elements of a plurality of multidimensional graphics, storing graphic display data for displaying a plurality of the multidimensional graphics (204). 1 storage means (200)
And a second storage means (20) for storing the geometric constraint condition.
1) and a plurality of multidimensional graphics (204) based on the plurality of graphics display data stored in the first storage means (200), the geometric constraint stored in the second storage means. An element whose state is arranged in the multidimensional space in a positional relationship determined by a condition, and whose position is regulated by the geometric constraint condition among the respective elements constituting the displayed multidimensional figure (204) And a display means (203) for performing a display for specifying the constraint type for all geometric constraint conditions. Hereinafter, each constituent element will be described.

[First Storage Means, Second Storage Means] The first storage means 200 and the second storage means 201 are
Even a non-volatile medium such as a disk device may be addressed by a volatile medium for temporary storage such as a main memory of the CPU. In addition, the first storage means 200 and the second storage means 201
May be built in the same device or may be built in a separate device.

[Multi-dimensional figure] A multi-dimensional figure is a plane figure that can exist in a two-dimensional space or a three-dimensional figure that can exist in a three-dimensional space. This multidimensional figure is arranged by the display means at an arbitrary position in the multidimensional space and in an arbitrary direction without changing the shape of itself.

[Geometric Constraint Condition] This geometric constraint condition is a condition that defines a mutual positional relationship between a plurality of multidimensional figures arranged in a multidimensional space. In this case, the geometric constraint condition can be defined so as to be defined between the pair of multidimensional figures. In this way, the positional relationship between three or more multidimensional figures can also be defined by defining the pair of combinations in a string.

This geometric constraint condition determines how each element forming the multidimensional figure, that is, the surface, line, point, etc., has a positional relationship with each element of another multidimensional figure. Is. Specific examples of this geometric constraint condition are "a plane and a plane are parallel to each other", "a plane and a plane are coincident with each other (meaning that the plane or its extension exists on the same plane as another plane)", "a straight line" Coincides with the plane "," straight lines are parallel to each other "," straight lines correspond to each other (meaning that the straight lines exist on the same axis) "," point exists on the surface (point is on the plane Exists on, the point exists on the cylindrical surface, the point exists on the conical surface, the point exists on the spherical surface, the point exists on the torus surface, etc.) "," the point exists on the line (the point exists "Existence on a straight line, including points in a circular arc, etc.""," Points match points "" Degree of freedom for rotation (when the solid is rotationally symmetric at an arbitrary angle,
Even if the rotation position of the figure is not specifically determined, it is considered that the rotation position is fixed) "," distance between planes "," distance between straight lines ",""Distance between point and plane", "Distance between point and straight line", "Distance between point" and "
Relative coordinates between coordinate systems (relative distances between coordinate systems that each solid is based on on display coordinates) "," Relative angles between coordinate systems (on display coordinates between coordinate systems that each solid is based on Relative angle) "and the like.

[Display Means] The display means can be composed of a display device for performing visual external output, and a processing unit for creating image data to be displayed on the display device.

The display means has a function of displaying a state in which a multidimensional figure is arranged in a multidimensional space in a positional relationship in accordance with a geometric constraint condition, each element to which the geometric constraint condition is applied, and the type of the constraint. And has a function of performing display for specifying and.

As a method of specifying this element, a pair of elements whose position is regulated by a geometric constraint condition may be connected by a line. By doing so, even when the geometric constraint conditions are complicatedly intertwined, each element can be easily specified. Other than that, the same symbols or numbers may be given to corresponding elements, or the same color may be given.

Further, as a method of specifying the type of constraint, a symbol or a number corresponding to the type of the geometric constraint may be displayed on the element whose position is controlled by the geometric constraint condition. With this configuration, the type of constraint can be easily displayed without specifying the type of constraint with characters.

The display means, when the positional relationship between the plurality of multidimensional figures is determined by the plurality of geometric constraint conditions stored in the second storage means, displays the element whose position is regulated by the geometric constraint conditions. The display for specifying the type of the constraint may be performed in a mode different from that before the confirmation. By doing so, it becomes possible to recognize at a glance whether or not the determination of the positional relationship between the multidimensional figures has been completed.

An example of this different mode is to change the display color of the display for specifying the element whose position is restricted by the geometric constraint condition and the type of the constraint. Before the positional relationship between a plurality of multidimensional figures is determined, each element is specified by connecting a pair of elements whose position is regulated by the geometric constraint condition with a line, and at the same time, the plurality of multidimensional figures are identified. The line may be deleted after the positional relationship between the dimensional figures is determined. Also,
Before confirming the positional relationship between a plurality of multi-dimensional figures, the type of constraint is specified by displaying a symbol or number corresponding to the type of the geometric constraint on a pair of elements whose position is controlled by the geometric constraint conditions. And display
After the positional relationship between a plurality of multidimensional figures is established, the symbol or the number displayed on one element may be deleted.

<Additional Configuration in the Present Invention> The present invention can be realized by adding the following additional configuration requirements to the essential configuration requirements of the present invention.

[Input Unit and Geometric Constraint Editing Processing Unit] The input unit for inputting the geometric constraint condition and the geometric constraint condition stored in the second storage means are updated according to the geometric constraint condition input by this input unit. A geometric constraint edit processing unit may be provided. By doing so, it is possible to arbitrarily edit the geometric constraint conditions. Such editing is possible because all geometric constraint conditions are displayed by the display means, which is an essential constituent feature of the present invention. At this time, the input unit can accept the input for each geometric constraint condition.

The input unit may receive an input to delete a specific geometric constraint condition. In this case, the geometric constraint editing processing unit updates the specified geometric constraint condition so as to be deleted from the second storage means.

When the geometric constraint condition stored in the second storage means is updated in this way, the display means positions and updates the multidimensional figure in accordance with the updated geometric constraint condition. Display is performed to specify the element to be positioned and the type of the constraint according to the later geometric constraint conditions.

<Operation> The first storage means stores graphic display data for displaying a plurality of multidimensional graphics. On the other hand, the second storage means stores the geometric constraint condition.

The graphic display data and the geometric constraint conditions are notified to the display means. Then, the display means displays a state in which the multidimensional graphic is arranged in the multidimensional space based on the notified graphic display data.

When there are a plurality of notified figure display data, the display means positions the multidimensional figures relative to each other according to the notified geometric constraint conditions. That is, the positional relationship between the constituent elements of each multidimensional figure is regulated in accordance with the geometric constraint condition to position the multidimensional figure.

Then, the display means also performs a display for specifying the constituent elements of these multidimensional figures positioned by this geometric constraint condition and the type of this constraint. This specific display is performed for all geometric constraint conditions. Therefore, by looking at the displayed multi-dimensional figure, it is clear at a glance what kind of geometric constraint is attached to which component.

An input unit for inputting geometric constraint conditions,
According to the geometric constraint condition input by this input unit, the second
If the geometric constraint editing processing unit for updating the geometric constraint conditions stored in the storage unit is provided, the geometric constraint conditions can be arbitrarily edited.

When the positional relationship between a plurality of multidimensional figures is determined by the geometric constraint condition stored in the second storage means, the specific display of the constrained constituent element and the constraint type is determined. If it is performed in a manner different from the previous one, it becomes clear at a glance whether or not the arrangement position has been confirmed.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<Structure of Embodiment> [Structure of Three-Dimensional CAD System] FIG. 2 is a functional block diagram showing the structure of a three-dimensional CAD system including the geometric constraint condition display device according to the first embodiment of the present invention.

This three-dimensional CAD system has a processing unit 1
And a processing unit 1, an input unit 2, a display processing unit 3, and a data unit 4, which are connected to the processing unit 1. The processing unit 1 is a component that controls the entire three-dimensional CAD system and creates a three-dimensional model to be displayed.
The input unit 2 is a component that inputs data to the processing unit 1. The display processing unit 3 is a component that displays the three-dimensional model created by the processing unit 1. Also,
The data unit 4 is a component that stores data used by the processing unit 1 to create a three-dimensional model.

The input unit 2 is composed of a keyboard and a mouse and has a function of inputting various data for displaying a three-dimensional model desired by the operator to the processing unit 1.

The data section 4 is specifically composed of a geometric constraint data storage section 4a as a first storage section and a shape data storage section 4b as a second storage section.
The shape data storage unit 4b stores solid shape data for defining the shape of each solid forming the three-dimensional model. The solid shape data for each solid is stored separately as data for the surface (element A) and data for the line (element B).

On the other hand, the geometric constraint data storage unit 4a stores geometric constraint conditions that define the positional relationship between the solids. Each geometric constraint condition is separated and stored into a constraint type and a usage element sequence (and a distance). Specifically, the types of restraint are as follows. That is, "
"Plane and plane are parallel", "Plane and plane match (meaning that plane or its extension exists on the same plane as other plane)", "Line and plane match", "Line and line And are parallel "," straight line and straight line match (meaning that straight line and straight line exist on the same axis) "," point exists on the surface (point exists on the plane, point exists on the cylindrical surface) , Including points on a conical surface, points on a spherical surface, points on a torus surface, and so on) "," points on a line (points on a straight line, points on an arc) , Etc.) "," Match points with each other "" The degree of freedom for rotation (when the solid is rotationally symmetric at an arbitrary angle
Even if the rotation position of the figure is not specifically determined, it is considered that the rotation position is fixed) "," distance between planes "," distance between straight lines ",""Distance between point and plane", "Distance between point and straight line", "Distance between point" and "
Relative coordinates between coordinate systems (relative distances between coordinate systems that each solid is based on on display coordinates) "," Relative angles between coordinate systems (on display coordinates between coordinate systems that each solid is based on Relative angle) "etc. The usage element sequence is a combination of elements (faces, lines, points, coordinates, etc.) to which the geometric constraint condition specified by the corresponding constraint type is actually applied.
It is to be specifically specified.

The processing unit 1 is specifically a CPU (central processing unit) 10, an assembly processing unit 11 connected to the CPU 1, and a geometric constraint condition creating unit connected to the assembly processing unit 11. 12 and a three-dimensional shape creating unit 13. The assembly processing unit 11, the geometric constraint data creation unit 12, and the three-dimensional shape creation unit 13
Actually, it is composed of a memory (RAM) that stores programs for realizing these functions. CPU1
Reference numeral 0 is a device for executing the programs stored in these memories to realize each function. Also, CPU1
0 executes input / output processing with the input unit 2, the display processing unit 3, and the data unit 4 under the control of the operating system (OS).

The three-dimensional shape creating section 13 displays a three-dimensional shape (a cube, a rectangular parallelepiped, a cylinder, a sphere, etc.) as a part constituting a three-dimensional model based on the data input by the input section 2. Create the data. When creating this three-dimensional shape data, this data is created based on a coordinate system that is independent of the display coordinate system for creating the three-dimensional model.

The geometric constraint condition creating unit 12 creates a geometric constraint condition that defines the mutual positional relationship of the solids created by the solid shape creating unit 13 based on the data input by the input unit 2, and the geometric constraint condition is created. Create geometric constraint display data to display the conditions on the screen. More specifically, the geometric constraint condition creating unit 12 includes a geometric constraint storage processing unit 12a, a geometric constraint editing processing unit 12b, and a geometric constraint display data processing unit 12c.

The geometric constraint storage processing unit 12a stores the geometric constraint conditions created by the geometric constraint editing processing unit 12b in the geometric constraint data storage unit 4a of the data unit 4 or the geometric constraint conditions stored in the data unit 4. Performs data read processing.

The geometric constraint edit processing unit 12b creates a geometric constraint condition from the data input by the input unit 2 or is read from the geometric constraint data storage unit 4a of the data unit 4 by the geometric constraint storage processing unit 12a. Edit to delete, change, or add geometric constraints.

The geometric constraint display data processing unit 12c creates geometric constraint display data for visually displaying the geometric constraint conditions based on the geometric constraint conditions edited by the geometric constraint editing processing unit 12b. FIG. 6 shows a display example of geometric constraint conditions based on the geometric constraint display data. As is apparent from FIG. 6, the geometric constraint condition is displayed by a pattern (symbol or number) indicating the constraint type and a straight line that specifies the utilization element sequence.

That is, the black-painted triangles shown in FIGS. 6A to 6D indicate faces to which the geometric constraint condition "faces match each other" is applied. A straight line (bonding line) that connects the black-painted triangles indicates a combination of elements (faces) that are mutually positioned by the geometric constraint condition that "faces match each other". Similarly, the black-painted quadrangle shown in FIGS. 6C to 6D indicates a surface to which the geometric constraint condition that "faces are perpendicular to each other" is applied, and the straight line connecting the black-painted quadrilaterals is the geometry. The combination of elements (faces) positioned relative to each other by the constraint condition is shown. On the other hand, the arrowed lines shown in FIG. 6A, 6C, and 6D represent the combinations of surfaces to which the geometric constraint condition regarding the distance is applied. Then, the number (100, 50) indicates the distance between the elements (planes) indicated by the arrows. However, as shown in FIG. 6C, the display data is not yet assembled (the placement position of the solid is determined), so the display contents of the geometric constraint conditions and the actual placement position of the solid are different. Do not match.

The geometric constraint display data processing unit 12c
Deletes, changes, or adds the geometric constraint display data in accordance with the geometric constraint conditions being deleted, changed, or added by the geometric constraint edit processing unit 12b. In addition, the geometric constraint display data processing unit 12c changes the display form of the geometric constraint condition according to the result of the assembly processing in the assembly processing unit 11.

The assembly processing unit 11 is a three-dimensional shape forming unit 1.
Stereoscopic display data for displaying each solid is created based on the solid shape data for defining each solid created in 3. Then, the assembly processing unit 11 displaces each stereoscopic display data in the display space in accordance with the geometric constraint conditions created by the geometric constraint editing processing unit 12b to obtain three-dimensional model display data for displaying the three-dimensional model. Perform the operations to build. The assembly processing unit 11 executes this calculation to determine the relative positional relationship between the plurality of solids. When executing the calculation, it is necessary that the minimum geometric constraint condition necessary for establishing the positional relationship between the solids is input. The assembly processing unit 11
Before the assembly is performed by inputting the minimum required geometric constraint conditions, the solid shape data is displayed at an arbitrary position in the display space (the 3D model display data was previously assembled, When the geometric constraint condition is deleted, the stereoscopic display data is created so as to be arranged at the position as it is.

The assembly processing unit 11 adds the geometric constraint display data created by the geometric constraint display data processing unit 12c to the three-dimensional model display data (stereoscopic display data) assembled as described above.

The display processing section 3 includes a display device 3a. Then, the 3D model display data (stereoscopic display data) assembled by the assembly processing unit 11
Based on the geometric constraint display data while displaying the three-dimensional model on the display device 3a.
Execute the process to display geometric constraint.

The geometric constraint display data processing unit 12c and the display processing unit 3 constitute display means. [Control Contents of Three-Dimensional CAD System] Next, the control contents executed in the processing unit 1 and the display processing unit 3 will be described with reference to FIG.
It will be described with reference to the flowchart of FIG.

FIG. 3 is executed before the completion of the input of the minimum geometric constraint conditions necessary to display the positional relationship between the solids and the completion of the assembling operation for determining the arrangement positions thereof. The processing performed is shown.

The processing shown in FIG. 3 is executed every time a new geometric constraint condition is input from the input unit 2 and whenever data for editing the geometric constraint condition is input. Then, in the first step S101, the geometric constraint condition edit processing unit 12b creates geometric constraint data (constraint type and utilization element sequence (and distance)) based on the input geometric constraint conditions. Then, the geometric constraint storage processing unit 12a
Stores the created geometric constraint data in the geometric constraint data storage unit 4 a of the data unit 4. When there is data input from the input unit 1 to delete the geometric constraint condition, the geometric constraint storage processing unit 12a deletes the geometric constraint data stored in the geometric constraint data storage unit 4a.

Next, in step S102, the assembly processing section 11 creates stereoscopic display data. However, when a part of the geometric constraint conditions is deleted after the three-dimensional model display data has been assembled before, the three-dimensional display data is created while keeping the positional relationship of each solid.

Next, in step S103, the geometric constraint display data processing unit 12c creates geometric constraint display data. After the geometric constraint display data and the stereoscopic display data are created as described above, the display processing unit 3
Displays each solid on the display 3a based on the created stereoscopic display data. At the same time, the display processing unit 3
Displays additional geometric constraints (patterns and connecting lines) on the displayed three-dimensional model based on the created geometric constraint display data. Then, the above series of processing is ended.

FIG. 4 shows a process executed to determine the positions of the three-dimensional solids after the input of the minimum geometric constraint conditions required to display the positional relationship between the solids is completed. There is.

The process shown in FIG. 4 is executed when an assembly determination instruction is input from the input unit 2. Then, in the first step S201, the assembly processing unit 11 determines, based on the geometric constraint data stored in the geometric constraint data storage unit 4a of the data unit 4 and the shape data stored in the shape data storage unit 4b, The process of assembling the data for displaying the three-dimensional model is executed.

Next, the geometric constraint display data processing unit 12c
In step S202, creates geometric constraint display data for completion of assembly. In step S203 after the geometric constraint display data and the three-dimensional model display data are created as described above, the display processing unit 3 checks whether the geometric constraint data is being displayed on the display 3a. To do.

If it is determined that the geometric constraint data is being displayed, the geometric constraint display currently being displayed is deleted in step S204. Then, the process proceeds to step S205.

On the other hand, when it is determined in step S203 that the geometric constraint data is not being displayed, step S20
4 is skipped and the direct processing proceeds to step S205. In step S205, the display processing unit 3 displays the geometric constraint display data newly created in step S202. Then, the above series of processing is ended.

FIG. 5 shows a subroutine of the geometric constraint display data creating process executed by the geometric constraint display data processing unit 12c in step S103 of FIG. 3 or step S202 of FIG. In this subroutine, first, in step S301, one undisplayed geometric constraint data is retrieved from the geometric constraint data storage unit 4a of the storage unit 4.

Then, in the following step S302, the type of constraint of the geometric constraint data extracted in step S301 is determined. Next, in step S303, the usage display pattern (symbol or number) corresponding to the type of constraint determined in step S302 is determined.

Next, in step S304, step S
The type of utilization element of the geometric constraint data extracted at 301 is determined. That is, it is determined whether the element constrained by this geometric constraint is a surface, a line, or a point. This determination is made by analyzing the type of geometric constraint.

If the usage element is a surface, then in step S305 surface data is acquired from the corresponding usage element sequence. If the usage element is a line,
In step S306, line data is acquired from the corresponding utilization element sequence. If the usage element string is point data, point data is acquired from the corresponding usage element string in step S307. If the type of geometric constraint is related to distance, data of the corresponding distance is also acquired in these steps.

In a succeeding step S308, the assembly processing section 11 determines whether or not the assembly processing is completed. This subroutine is step S103 in FIG.
If called from, the assembling of the three-dimensional model display data has not been completed, so the process advances to step S309. On the other hand, if this subroutine is called from step S202 in FIG. 4, step S2
Since the assembly of the three-dimensional model display data is completed at 01, the process proceeds to step S310.

In step S309, the display data of the incomplete geometric constraint is created. That is, the pattern (symbol or number) and the connecting line are displayed for all geometric constraint conditions. Specifically, in the case of a qualitative geometric constraint, the display position of the pair of utilization elements acquired in any of steps S305 to S307 is set in step S3.
The display pattern (symbol) determined in 03 is displayed, and the data for displaying the connecting line connecting them is created. Further, in the case of the geometric constraint on the distance, the connecting line with an arrow connecting the pair of utilization elements acquired in any of steps S305 to S307 is displayed, and the data for displaying the distance in numbers is created.

On the other hand, in step S310, geometric constraint display data for completion is created. That is, step S
Display data for displaying the geometric constraint conditions is created in a different form from the display data created in 309.
Specifically, as shown in FIG. 7, in the case of a qualitative geometric constraint, steps S305 to S307.
Display pattern (figure) confirmed in step S303 at the display position of the utilization element of the constrained solid obtained by any of
Create data to display only. Further, in the case of the geometric constraint on the distance, similarly to step S309, the connecting line with an arrow that connects the pair of utilization elements acquired in any of steps S305 to S307 is displayed, and the distance is displayed as a number. The data to be created is created.

The display data for completion, which is created in step S310, may be a display as shown in FIG. Specifically, in the case of a qualitative geometric constraint, data for displaying the same display pattern and connecting line as the display data created in step S309 in a different color from those is created. Also,
In the case of the geometric constraint on the distance, steps S305 to S30 are performed in the same manner as in step S309.
In addition to displaying the arrow-attached connecting line that connects the pair of utilization elements acquired in any one of 7 above, the data that displays the distance in numbers is created.

After executing step S309 or step S310, the process proceeds to step S311. In step S311, it is determined whether or not there is undisplayed geometric constraint data in the geometric constraint data storage unit 4a of the data unit 4. When this subroutine is called in step S103 of FIG. 3, there is no geometric constraint data that has not been displayed, so this subroutine is terminated and the process returns to the original processing position. On the other hand, when this subroutine is called in step S202 of FIG. 4, there may be geometric constraint data that has not been displayed, and therefore the process proceeds to step S301.
Return to. Then, from step S301 to step S31
When the undisplayed geometric constraint data disappears as a result of repeating the loop up to 1, this subroutine is terminated and the process returns to the original processing position. <Operation of Embodiment> [Display before Completion of Assembly] According to the geometric constraint display device of this embodiment, the geometric constraint conditions are edited as follows. Now, as shown in FIG. 7A, it is assumed that a reference solid 101 that displays a rectangular parallelepiped and a constrained solid 102 that displays a rectangular parallelepiped are created. And, "face 1A of solid 101 and face 2 of solid 102
Geometrical constraint condition "consistent with A (constraint A)", "solid 10"
The geometric constraint condition that "the face 1B of 1 corresponds to the face 2B of the solid 102" (constraint C), and the geometric constraint condition that "the distance between the face 1C of the solid 101 and the face 2C of the solid 102 is 100" (constraint D) 7 is input from the input unit 2, the geometric constraint condition is displayed on the display 3a as shown in FIG. Therefore, all geometric constraint conditions are displayed. [Display after completion of assembly] In this state, an assembly determination instruction is input from the input unit 2, and data assembly for 3D model display is performed. When the calculation is complete,
A geometric constraint condition display for completion of assembly is displayed as shown in (b). That is, constraint A and constraint C which are qualitative constraints
In, the display of the connecting line showing the combination of the utilization elements is erased. At the same time, in constraint A and constraint C, the display pattern (black-filled triangle) indicating the utilization element and the type of constraint on the reference solid 101 side is erased.

As described above, according to the present embodiment, since the geometric constraint display method is changed before and after the completion of the assembly of the three-dimensional model display data (determination of the mutual positional relationship of the solids), the assembly is completed. It is obvious whether or not there is. Moreover, even after the assembly is completed, the type of geometric constraint can be specified from the display pattern attached to the constrained solid 102. Furthermore, from the position of the utilization element on the constrained solid 102 to which the display pattern is attached and the type of geometric constraint,
The position of the working element on the reference solid 101 can also be estimated. Therefore, all geometric constraint conditions can be confirmed and edited regardless of before and after the assembly is completed.

When the geometric constraint condition display for completion of assembly is performed in accordance with FIG. 8, the geometric constraint condition display for completion of assembly as shown in FIG. 8B is displayed.
That is, the geometric constraint display (display pattern (filled triangle) and connecting line) in the constraint A and the constraint B, which are qualitative constraints, is displayed in a color different from that before assembly is completed (see FIG. 8A). . In this case, it is clear whether or not the assembly is completed,
Even after the assembly is completed, the geometric constraint conditions can be completely recognized. Therefore, it is possible to easily edit the geometric constraint conditions. [Editing Geometrical Constraint Conditions] Next, the procedure for editing the geometrical constraint conditions in this embodiment will be described. In this embodiment, the geometric constraint condition can be edited regardless of whether the assembly of the 3D model display data is completed. FIG. 6 shows a state in which the geometric constraint condition is edited after the assembly is completed.

First, FIG. 6A shows a state in which the geometric constraint conditions of the constraint A, the constraint C, and the constraint D are input, as in FIG. 8B. From this state, restrained solid 1
02 is rotated counterclockwise and the solid 101,
It is assumed that editing is performed to reduce the distance between 102 to 50.

In that case, by observing the geometric constraint condition display displayed as shown in FIG. 6A, it is understood that the constraint A and the constraint D among the respective geometric constraint conditions are an obstacle. To be done. Therefore, the fact that the constraint A and the constraint D are to be deleted is input via the input unit 2.

Then, the geometric constraint data 4a storage unit 4a of the data unit 4 is executed by executing step S101.
The geometric constraint data relating to the constraint A and the constraint D is deleted from. Therefore, in step S103, geometric constraint data excluding the geometric constraint display of the constraint A and the constraint D is created. As a result, as shown in FIG. 6B, the geometric constraint display of the constraint A and the geometric constraint display of the constraint D are erased from the display 3a. Further, the geometric constraint display of the remaining constraint C is in a mode before assembly.

Next, in order to rotate the constrained solid 102, "face 1A of the solid 101 and face 2 of the solid 102 are newly added.
A geometrical constraint condition (constraint B) that "A is vertical" is input through the input unit 2. At the same time, in order to bring the constrained solid 102 closer to the reference solid 101,
A geometric constraint condition (constraint D ′) in which the distance between C and the surface 2A of the solid 102 is 50 ″ is input via the input unit 2. As a result, step S103 is executed, and thereby, FIG. The geometric constraint display (constraint B, constraint D ') is displayed between the elements to which the geometric constraint condition is applied, as shown in Fig. 11. However, since the assembly is not performed at this point, the geometric constraint display mode is displayed. Is for before assembly,
The contents of the geometric constraint and the actual arrangement position of the solid do not match.

Next, when an assembly decision instruction is input,
By executing step S201, the solid 102
The arrangement position of is changed as shown in FIG. That is, the constrained solid 102 satisfies the condition (constraint C) that "the surface 1B of the solid 101 and the surface 2B of the solid 102 are coincident with each other", and counterclockwise in the plane in which the surface 2B exists.
Rotate once. At the same time, the opposing faces (face 1C, face 2)
The solid 102 approaches toward the solid 101 so that the relative distance of A) becomes 50.

After further editing and assembling as described above, if further editing is required, it is possible to continue the editing.

[0075]

According to the present invention, when displaying a multidimensional model in a multidimensional CAD system, the added geometric constraint condition can be easily confirmed on the screen. Therefore, each of the displayed geometric constraint conditions can be individually designated and edited. Therefore,
The geometric constraint conditions can be easily edited, and the solid can be moved efficiently.

If the assembly completed portion and the incomplete portion of the displayed geometric constraint conditions are displayed in different modes, the assembly completed portion and the incomplete portion can be easily displayed on the drawing. Can be confirmed. Therefore, the confirmation work time can be shortened.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a block diagram showing a configuration of a three-dimensional CAD system including a geometric constraint condition display device for a three-dimensional model according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the control contents when a geometric constraint condition is input.

FIG. 4 is a flowchart showing control contents when an assembly determination instruction is input.

5 is a flowchart showing the contents of a display data creation processing subroutine executed in step S103 of FIG. 3 or step S202 of FIG.

FIG. 6 is a diagram showing a procedure for editing a geometric constraint condition.

FIG. 7 is an explanatory diagram of changes in the display mode of geometric constraint conditions before and after assembling the three-dimensional model display data.

FIG. 8 is an explanatory diagram of changes in the display mode of geometric constraint conditions before and after assembling the three-dimensional model display data.

FIG. 9 is an explanatory diagram of geometric constraint conditions.

FIG. 10 is an explanatory diagram of a conventional display mode of geometric constraint conditions.

[Explanation of symbols]

1 ... Processing unit 2 ... Input section 3 ... Display processing unit 4 ... Data section 11 ... Assembly processing section 12 ... Geometric constraint condition creation unit 13 ... Three-dimensional shape creation unit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-250258 (JP, A) JP-A-6-102915 (JP, A) JP-A-6-119424 (JP, A) FUJITSU S Family IC AD / MX Operation Manual 3rd Edition (Design / Manufacturing Support System), Nihon, Fujitsu Limited, July 31, 1994, 2nd edition, p363-395, Chapter 2 Dimension / some constraint menu (58 ) Fields surveyed (Int.Cl. ⁷ , DB name) G06F 17/50

Claims (6)

(57) [Claims] 1. When arranging a plurality of three-dimensional figures in a three-dimensional space, a geometric constraint condition display device for displaying a geometric constraint condition that defines a positional relationship between the plurality of three-dimensional figures is provided. A first storage unit for storing graphic display data for displaying a geometric constraint condition that defines a positional relationship between the three-dimensional graphics; and a plurality of graphic display data stored in the first storage unit. A state in which a plurality of three-dimensional figures are arranged in a three-dimensional space in a positional relationship determined by the geometric constraint condition stored in the second storage means is displayed, and the displayed three-dimensional figure is configured. before the display to identify the elements by connecting a line between a pair of elements positioned regulated under by the geometric constraint condition of each element is performed with respect to the total geometric constraint conditions stored in the second storage means
The plurality of three-dimensional figures according to the plurality of geometric constraint conditions
If the positional relationship between the
Therefore, the position-regulated element can be set in a different
Further comprising a display means for displaying, geometric constraint condition display device according to claim. 2. The display means displays a symbol or a number corresponding to the type of the geometric constraint on an element whose position is restricted by the geometric constraint condition, thereby performing a display for specifying the type of the constraint. The geometric constraint condition display device according to claim 1, wherein: 3. The display means, when the positional relationship between the plurality of three-dimensional figures is determined by the plurality of geometric constraint conditions stored in the second storage means, the constraint is held.
Display that identifies the type of
To it, a geometric constraint condition display device according to claim 1, wherein. 4. The display means changes a display color of a display that specifies an element position-controlled by the geometric constraint condition and a type of the constraint before and after the positional relationship of the plurality of three-dimensional figures is determined. The geometric constraint condition display device according to claim 3, wherein 5. The display means specifies each element by connecting a pair of elements whose position is regulated by the geometric constraint condition with a line before the positional relationship between the plurality of three-dimensional figures is determined. The geometric constraint condition display device according to claim 4, wherein the line is erased after the positional relationship between the plurality of three-dimensional figures is established. 6. The display means, on the pair of elements positioned by the geometric constraint condition, before the positional relationship between the plurality of three-dimensional figures is determined, a symbol or a symbol corresponding to the type of the geometric constraint. While displaying the number to specify the type of restraint, by deleting the symbol or the number displayed on one element after the positional relationship of the plurality of three-dimensional figures is confirmed. The geometric constraint condition display device according to claim 4.