JPH08106551A - Three-dimensional graphic preparing device - Google Patents

Abstract

PURPOSE: To reduce the redundant information input works when a three- dimensional graphic is generated. CONSTITUTION: In a three-dimensional graphic preparing device having a constitution that a graphic data preparing means 101 prepares graphic data based on the input of the feature information corresponding to a three-dimensional graphic, the data is held in a graphic data holding means 102 and this graphic data is offered for the display of the shape of a three-dimensional graphic by a display means 103, the device is provided with a surface designation means 111 designating any one of the surfaces composing the three-dimensional graphic as a designated surface, an information extraction means 112 extracting the information on the shape and arrangement of a pertinent surf ace from the graphic data held in the graphic data holding means 102 and transmitting the information as the part of the feature information corresponding to the three- dimensional graphic which is newly generated in the graphic data preparation means 101 and a length information input means 113 inputting the length information on the spread in the length direction of the newly generated three- dimensional graphic and transmitting the information as other part of the feature information to the graphic data generating means 101.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional figure creating apparatus for creating a three-dimensional figure model in a three-dimensional CAD system.

[0002] A three-dimensional CAD system is used for design work in various fields, and in order to meet a variety of user's demands, a plurality of solid bodies of various shapes can be arranged freely. When combined, a high degree of freedom is given to the arrangement of each solid.

Fields to which the three-dimensional CAD system is applied include fields such as pipeline and piping design, in addition to so-called mechanical design. In these areas,
Usually, we often repeat the work of connecting solids with the same cross-sectional shape one after another, so we proceed with the design work,
The restrictions on the degree of freedom when arranging solids are increasing.

[0004]

2. Description of the Related Art FIG. 6 shows a configuration example of a conventional three-dimensional CAD system. In FIG. 6, a graphic model representing a three-dimensional graphic is stored in the graphic model storage unit 301,
Based on this graphic model, the projection drawing creation unit 302 creates line drawing data representing a projection graphic corresponding to, for example, a three-view drawing (plan view, front view, and right-side view) and perspective view by the third angle method. It is configured to be. The line drawing data is expanded into image data by the drawing processing unit 303, displayed on the display device 305 via the frame memory 304, and provided to the user.

In the three-dimensional CAD system,
The user operates the mouse 306 or the keyboard 307 to input the end points of the line segments forming the projection figure, the center and radius of the circle, etc. in the projection diagram corresponding to each projection direction obtained as described above. Is designed so that a new three-dimensional figure can be created.

The above-mentioned information about the projected figure is sent to the figure data creating section 311 via the input interpreting section 308, and the figure data creating section 311 three-dimensionally based on the relationship of the projected figures corresponding to the respective projection planes. The graphic data representing the graphic is created and stored in the graphic model holding unit 301 via the model management unit 312.

On the other hand, when the user gives an instruction to move or rotate an existing graphic, the input interpreting unit 308 activates the graphic operating unit 313, and the graphic operating unit 313
In accordance with an instruction from the user, the graphic model stored in the graphic model holding unit 301 is accessed via the model management unit 312, and necessary coordinate conversion processing is performed.

Utilizing a conventional three-dimensional CAD system,
There are the following two methods for arranging another solid on the already created solid. The first method is to input a new three-dimensional projection figure on top of an existing three-dimensional projection figure, and select 3 from the projection figure corresponding to each projection direction.
This is a method of creating dimensional graphic data.

In this case, it is necessary to input the projection figure corresponding to each projection direction in consideration of the arrangement of the existing solid and the new solid. At this time, for example, if the surface on which the new solid is to be placed is parallel to the projection surface, the projected figure can be easily input.

The second method is to create a new solid completely different from the existing solid, and use the moving function of the figure operation unit 313 to move the created solid to create the existing solid. Combined with.

In this case, since the new solid creation work can be performed regardless of the positional relationship with the existing solid, the new solid creation work is simple, and as described above, the moving function is used. Since a large degree of freedom is given to the arrangement of the solids, it is possible to combine a plurality of solids in various arrangements.

[0012]

As described above, the conventional three-dimensional CAD system is large in response to input of projected figures and movement of a solid body on the assumption that solid bodies having various shapes are combined in various arrangements. The degree of freedom is given.

In the field of pipeline design and the like, many solids to be combined are cylinders and toruses having the same cross section, and the bottoms of these cylinders and torus must be in contact with each other. Will be placed.

That is, the shape of the bottom surface of the graphic model representing the solid to be combined and the layout of the bottom surface are already determined by the shape of the existing graphic model. However, in the above-mentioned conventional method, it is necessary to specify the projection shape for all solids including the bottom surface, and it is also necessary to specify the arrangement of the solids as a whole.

As described above, in the conventional three-dimensional CAD system, since the information already determined by the existing three-dimensional shape such as the shape of the bottom surface and the arrangement thereof is redundantly input, the user The work burden of was increasing.

An object of the present invention is to provide a three-dimensional CAD system capable of omitting redundant work when arranging solid bodies having the same bottom surface.

[0017]

According to the present invention, the graphic data created by the graphic data creating means 101 is held in the graphic data holding means 102 on the basis of the input of the feature information indicating the feature of the shape of the three-dimensional graphic. , This graphic data is displayed on the display means 1
In the three-dimensional figure creating apparatus configured to display the shape of the three-dimensional figure according to No. 03, the plane designating means 111 for designating one of the planes forming the three-dimensional figure as the designated plane, and the input of the designated plane, Information regarding the shape and arrangement of the corresponding surface is extracted from the graphic data held in the graphic data holding means 102, and is sent to the graphic data creating means 101 as part of the feature information corresponding to the newly created three-dimensional figure. An information extraction unit 112 and a length information input unit 113 for inputting length information regarding the lengthwise extension of a newly created three-dimensional graphic and sending it to the graphic data creation unit 101 as another part of the characteristic information. It is characterized by having.

[0018]

According to the present invention, the information extracting means 112 operates according to the specified surface obtained by the surface specifying means 111.
The configuration is such that information about the shape and arrangement of the corresponding surface is obtained.

Here, in the fields such as the above-mentioned pipeline design, the shape of the bottom surface of the three-dimensional figures that are connected and arranged is common, so that the surface designating means 111 as described above.
By operating the information extracting unit 112 and the information extracting unit 112, information about the bottom surface of the three-dimensional figure to be newly created can be obtained.

Further, since the features of a three-dimensional figure such as a cylinder and a torus can be completely represented by the information about the bottom surface and the information about the spread in the length direction,
By inputting the information about the bottom surface extracted as described above and the length information input by the length information input means 113 to the graphic data creating means 101 as the feature information corresponding to the newly created three-dimensional graphic. , The corresponding graphic data can be obtained.

That is, according to the present invention, by designating a face of an existing three-dimensional figure and inputting length information based on the face, the bottom face having the same shape is contacted with the designated face. It is possible to automatically create graphic data representing the arranged three-dimensional graphic.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 shows a block diagram of an embodiment of a three-dimensional CAD system to which the three-dimensional figure creating apparatus of the present invention is applied.

Referring to FIG. 2, the three-dimensional figure creating apparatus of the present invention includes a surface searching section 211, a vector calculating section 212, a creation control section 213, and a length information creating section 214 in addition to the three-dimensional CAD system shown in FIG. Is added to this generation control unit 213
However, in accordance with an instruction from the user input via the input interpreting unit 308, the figure corresponding to the figure data creating unit 101 together with the surface searching section 211, the vector calculating section 212, and the length information creating section 214 described above. The data creation unit 311 is controlled to proceed with the creation work of the three-dimensional figure.

In the case of normal creation work, the creation control unit 213 described above uses the graphic data creation unit 311 as it is for the information about the projected graphic input via the input interpretation unit 308.
When the instruction is made to connect to a figure having the same bottom as the existing bottom of the figure (hereinafter referred to as an extension of the figure), the instruction is made to the 3D figure data generation processing similar to the conventional method. The surface search unit 211 and the vector calculation unit 212 are activated, and the extension work of the graphic is controlled by the procedure described later.

Hereinafter, a cylinder having the same shape as the bottom surface of the torus (shown by hatching in the perspective view of FIG. 3) as shown in FIG. The operation of the three-dimensional graphic creation apparatus of the present invention will be described by taking the case of connecting and extending a graphic as an example.

The user operates the mouse 306,
When a point on the perspective view is designated, the coordinates of the designated point serve as information for designating one of the faces of the three-dimensional figure shown on the perspective view, via the input interpreting unit 308, and the generation control unit 31.
Input to 3.

In response to this, the creation control section 313 first activates the above-mentioned surface search section 311 to instruct the processing for searching the surface specified by the user based on the coordinates of the specified point described above. .

The surface search unit 211 considers a virtual straight line that passes through the above-mentioned designated point and is parallel to the projection direction, searches for a point at which this straight line intersects the torus shown in FIG. A surface close to the surface may be designated by the user (hereinafter referred to as a designated surface).

At this time, the surface search unit 211 accesses the graphic data stored in the graphic model holding unit 301 corresponding to the graphic data holding unit 102 via the model management unit 312, and the graphic data indicated by the graphic data is accessed. It suffices to obtain the equation of each surface, calculate the intersection with the above-mentioned straight line, and determine the designated surface based on this result.

As described above, based on the coordinates of the point designated by the user via the mouse 306, the input interpreter 308
By the above-described processing performed by the surface search unit 211, it is possible to realize the function of the surface specifying unit 111 and specify the surface on which a new figure is to be arranged.

Next, the plane search unit 211 is connected to the model management unit 3
Information regarding the shape of the designated surface is read from the graphic model holding unit 301 via the 12, and the graphic data creation unit 31
It should be sent to 1.

In response to the end of the search process for the specified surface, the creation control section 213 activates the vector calculation section 212 and gives an instruction to calculate the normal vector of the specified surface. In response to this, the vector calculation unit 212 receives the equation of the specified surface from the surface search unit 211, calculates the normal vector of the specified surface based on this equation, and sends it to the graphic data creation unit 311 as the layout information of the graphic. do it.

As described above, the surface search unit 211 and the vector calculation unit 212 are operated according to the instruction from the generation control unit 213.
Operates to realize the function of the information extraction means 112, and as the information indicating the shape of the bottom surface of a new graphic and the layout of the bottom surface, the information about this designated surface is extracted from the graphic model holding unit 312, and the graphic data is obtained. Can be used for the preparation process.

Therefore, in this case, the user operates the mouse 306 to designate a point on a desired plane on the perspective view, whereby the shape of the bottom of the figure to be newly arranged and its normal line. Vectors and can be easily specified.

As described above, the characteristics of a three-dimensional figure such as a cylinder or a torus are completely specified by the shape of the bottom surface and its normal vector and the length information indicating the spread in the extension direction with respect to the bottom surface. can do.

Therefore, after the information on the bottom surface is designated as described above, the user operates the mouse 306.
By operating the or keyboard 307 and inputting, for example, that the new figure is a cylinder and its height, it is possible to create graphic data representing the cylinder connected to the designated surface shown in FIG. is there.

At this time, the generation control unit 213 converts the information input via the input interpretation unit 308 into the length information generation unit 21.
4, and in response to this, the length information creation unit 214
The length information may be created and sent to the graphic data creating unit 311.

Here, when it is indicated that the new figure is a cylinder, the length information creating section 214 keeps the information indicating that it is a cylinder and the information indicating the height as it is.
11 may be sent. On the other hand, it is specified that the new figure is a torus, and as shown in FIG. 4, the position of the center of rotation of the torus in the projected view (indicated by arrow A in FIG. 4) and the rotation angle θ from the reference plane are If entered,
The length information creation unit 214 receives information about the center position of the designated surface from the face search unit 211, obtains the radius of rotation R of the torus based on the position of the center of the designated surface and the position of the center of rotation, and performs this rotation. The radius R and the rotation angle θ may be sent to the graphic data creation unit 311 as length information.

As described above, by inputting the information input through the input interpreting unit 308 into the length information creating unit 214 through the creation control unit 213, and performing the above-described length information creating process, The function of the information input means 113 can be realized.

As described above, according to the present invention, the input of redundant information can be omitted by utilizing the constraint concerning the arranged graphic, and the three-dimensional shape having the same bottom surface, such as a torus and a cylinder. The placement process of figures is automatically executed according to the designation of the bottom surface which is the basis of placement and the input of length information, and figure data representing a three-dimensional figure as shown by the dotted lines in FIGS. 3 and 4 is created. It becomes possible to do.

As a result, the procedure for inputting information required for design work such as pipelines can be greatly simplified and the work load on the user can be reduced, so that the efficiency of design work is dramatically improved. It becomes possible to do.

The present invention is not limited to a circular shape, and can be used to extend three-dimensional figures having various cross sections. For example, by designating various surfaces of the projection object as shown in FIG. 5 and inputting desired lengths, as shown by dotted lines in FIG. 5, three-dimensional columns having the same bottom surface as each surface Shapes can be created easily.

[0043]

As described above, the present invention has three advantages.
By specifying the surface of the three-dimensional figure and inputting the length information based on that surface, the figure data that represents the three-dimensional figure that has the same bottom surface and is placed in contact with the specified surface is automatically generated. Since it can be created, it is possible to omit redundant information input and reduce the user's work load when the three-dimensional figures having the same bottom face are combined, such as pipeline design work. Therefore, the work efficiency can be greatly improved.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of an embodiment of a three-dimensional CAD system to which the three-dimensional graphic creation device of the present invention is applied.

FIG. 3 is a diagram for explaining a graphic extension operation.

FIG. 4 is a diagram illustrating a graphic extension operation.

FIG. 5 is a diagram illustrating a graphic extension operation.

FIG. 6 is a three-dimensional C to which a conventional three-dimensional figure creating device is applied.
It is a figure which shows the structural example of AD system.

[Explanation of symbols]

 101 Graphic Data Creating Means 102 Graphic Data Holding Means 103 Display Means 111 Surface Designating Means 112 Information Extracting Means 113 Length Information Input Means 211 Surface Searching Units 212 Vector Calculating Units 213 Creation Control Units 214 Length Information Creating Units 301 Graphic Model Holding Units 302 Projection drawing creation unit 303 Drawing processing unit 304 Frame memory 305 Display device 306 Mouse 307 Keyboard 308 Input interpretation unit 311 Graphic data creation unit 312 Model management unit 313 Graphic operation unit

Claims (1)

[Claims] 1. The graphic data created by the graphic data creating means is held in the graphic data holding means on the basis of the input of the feature information indicating the feature of the shape of the three-dimensional graphic, and the graphic data is displayed by the display means. In a three-dimensional figure creating device configured to display the shape of a three-dimensional figure, a plane designating unit that designates any one of the planes constituting the three-dimensional figure as a designated plane, and the figure according to an input of the designated plane. Information extraction for extracting the information on the shape and arrangement of the corresponding surface from the graphic data held in the data holding means, and transmitting it as part of the characteristic information corresponding to the three-dimensional graphic newly created in the graphic data creating means. Means and length information regarding the lengthwise extension of the newly created three-dimensional figure, and sends it to the figure data creating means as another part of the characteristic information. A three-dimensional graphic creation device comprising: length information input means.