JPH0616290B2 - Method for defining shape of three-dimensional connected body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a CAD system, and more particularly to a shape defining method suitable for a connecting body such as a duct or pipe.

[Background of the Invention]

Conventional typical shape definitions include a method of using a basic constituent element (hereinafter, referred to as a primitive) and a method of directly defining vertex coordinates and edges (lines connecting two vertices) that constitute an object. .

In the former, the attributes and coordinates of the primitive must be defined. In the latter case, the coordinates and edges of all the vertices that make up the target must be defined, which requires a huge amount of work.

[Object of the Invention]

It is an object of the present invention to provide a shape definition method that minimizes the number of data input points in the shape definition and shape change (correction) of a three-dimensional connected body and minimizes the data input work load.

[Outline of Invention]

In order to achieve the above object, the present invention takes into consideration the characteristics of a three-dimensional connected body such as a duct / pipe (connection of primitives) and shape changes that are frequently repeated at the time of design, and specifically, a normal three-dimensional connection. The body is composed of several primitives, the joint surfaces between the primitives have the same shape, and the primitives are defined by some attributes. Is defined by using a primitive, first, the joint surface of the primitive can be indicated by a tablet, etc. to form a non-metrical structure of the target connected body, and then the measurement data is defined. There are features. Here, the shape data other than the structurally determined data (which is automatically defined) and the position of the primitive to be placed first,
Define the direction.

Example of Invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of a CAD system embodying the present invention.

FIG. 2 is a flowchart showing a procedure for defining the shape of a duct, which is a typical three-dimensionally connected body. The processing contents of FIG. 2 will be described with reference to FIG. In Figure 2, block 1
0 to 13 are preparatory work for shape definition. In block 10, the shape definition of the target duct system is started. Block 1
In 1, the constituent ducts of the target duct system are examined to create a list of constituent components. In block 12, it is checked whether or not the target duct system can be defined by the already registered primitive, and if it can be defined, the process proceeds to the next block 14. On the other hand, if there is a primitive that must be newly defined in order to define the target duct system, the process proceeds to block 13. In block 13, a new primitive is created and registered (details will be described later).

Blocks 14 to 18 utilize primitives to define the shape of the target duct system. In block 14, the primitive is added (or changed) to the structural arrangement (details will be described later). Block 15 checks to see if a non-metrical structure of the target duct system has been formed. If there are more primitives to add or change, return to block 14.
Block 1 if there is no primitive to add or change
Go to 6.

Since the non-metrical structure of the duct system has been sought for the object so far, the block 16 sets the data of the dimensions and angles of each primitive as the quantitative data. Those that are structurally determined depending on other data are automatically set by the computer 1. Other than that, instructions from Calculator 1 (Display 2
(Displayed above), the operator 5 depresses the numerical value on the tablet 4 with the light pen 3. In block 17, it is checked whether the defined duct system is satisfactory for the operator 5. If changes are needed, return to block 14. If satisfied, the block 18 ends the shape definition.

Next, the main blocks of FIG. 2 will be described in more detail.

Block 13: Create / register a new primitive.
FIG. 3 is an example of a rectangular tube primitive. Four faces 2
It is composed of 1 to 24. Each face is composed of four edges. For example, the lower surface 21 is composed of four edges 25 to 28. Each edge is defined by two vertices. For example, Edge 25
It is defined by vertices 37 and 38. FIG. 4 is a table showing the primitive (right-angled tube) shown in FIG. The table (a) represents a series of primitive seeds. The primitive number 51 and the number of faces constituting the primitive are 5
2. Start point pointer 5 where the surface data is written
3 and the items of the primitive attribute 54. The first row of this table shows the data defining the right angle tube of FIG. As is apparent from FIG. 3, the rectangular tube is defined by three attributes 54 represented by x ₀ , y ₀ and z ₀ .

The table (b) defines a surface, and the address 55 pointed by the pointer 53, the number of edges forming the surface 56, the code 57 indicating the type of the surface (0 represents a plane), and the edge data are written. It includes a starting point pointer 58 and a connecting pointer 59 for connecting edges as indicated by arrows. The table (c) defines an edge, and the address 60 designated by the pointer 58, the vertices 61 and 62, and the edge type 63.
(0 represents a straight line), and is composed of items of continuous pointers 64 which are continuous between edges as indicated by arrows.

The table (d) represents three-dimensional coordinates 66 for each vertex 65, that is, (x, y, z), and the vertex names 65, 3
It is composed of items of the dimensional coordinates 66. Three-dimensional coordinate 66
Can be defined by the attributes x ₀ , y ₀ , z ₀ of the primitive, as is clear from the contents of the table (d). The relationship between this attribute and the three-dimensional coordinates is used for automatically updating the dimension data in the duct system shape definition performed by the blocks 14 and 16.

Block 14: Adds (changes) a primitive to the structurally arranged duct system.

The block 14 will be described in detail with reference to FIGS. In FIG. 1, the operator 5 uses the light pen 3 to instruct the duct initial placement command on the tablet 4 in the display 2
A request to enter the name of the duct system appears above. Operator 5
Accordingly, as shown in FIG. 5, DUCT-1 is used as the duct system name 70 in the mode of duct structure arrangement.
Enter. Next, on the display 2, an input request for the position and direction for arranging the first primitive appears. When the position and direction are input by using the tablet 4 and the light hen 3 according to the request, the arrow 71 is displayed on the display 2. Next, from the primitives described on the tablet 4, the next one to be structurally arranged is the light pen 3
6 is used to display a primitive (isometric diagram) 73 instructed on the primitive area 72 at the upper right of the screen of the display 2 as shown in FIG. The joining point between the arrow 71 and the primitive 73 is designated by the light pen 3 on the tablet 4. The joining point of the primitive 73 need only indicate the vicinity of the vertex. Calculator 1
Calculates the distance between the designated point and each vertex of the primitive 73, and the closest point is designated as the designated ● mark.
Is displayed. When the operator 3 completes the confirmation of the displayed point (indicates the confirmation mark on the tablet 4 with the light pen 3), the primitive 73 moves to the position of the arrow 71 (movement is movement of 4 rows and 4 columns). This can be done by applying a matrix to each vertex coordinate.For details, refer to Deguchi's "Graphic Processing Engineering by Computer Display",
Nikkan Kogyo Shimbun, Showa 56 ”). 7 and 8 show an example of adding a primitive. The addition of the primitive 76 in FIG. 7 is different from the case where the primitive is arranged first only in the process of instructing the correspondence between the junction points 77 and 78 for the duct system 75 already formed at the position of the arrow. Just the other things are the same.

FIG. 8 shows a connecting point 81 for further adding a primitive 80 to the duct system to which the primitive 76 is added.
An example of a screen configuration for instructing the correspondence between Nos. And 82 is shown.

Block 16: Sets / changes duct dimensions and angle data.

FIG. 9 is an example of a screen configuration on the display 2 for setting duct data. The operator 5 follows the input request of the attribute data 81 from the computer 1 (blinks the line segment corresponding to 81) and the attribute data 82 of each constituent element.
To set. When the attribute data 82 is set, the coordinate data 66 of the table (d) of FIG. 4 is calculated and the coordinate value is updated. Furthermore, when one attribute data 82 is set, the attribute data 83.84 which is automatically determined from the structural condition of the duct structure arrangement is also set. When setting the angle, if the setting is omitted, the angle is set to a predetermined value (preset value). As a result, the data set by the operator 5 can be minimized. Further, when changing the dimensions, the data determined structurally is automatically changed by changing only one coordinate data.

When the setting of the duct data is completed, the operator 5 can display the isometric diagram of the target duct system in the isometric diagram display mode as shown in FIG. 10 in order to confirm the set data. . Attribute data 85, 8
6 and 87 are the width and height of the primitive 75,
It represents the length. These data are set by the block 16 in FIG. Attribute data 88, 8
Reference numerals 9 and 9 respectively represent the bending angle of the primitive 76 and the height of the exit. In the primitive 76, since the attribute data of the width and height of the entrance are the same as those of the primitive 75, the display thereof is omitted. Attribute data 90
Represents the length of the primitive 80. Also in the primitive 80, the attribute data of width and height is the same as that of the exit of the primitive 76, and therefore the display thereof is omitted.

〔The invention's effect〕

According to the present invention, the shape definition of a three-dimensional concatenated body is set by setting the coordinate and direction data of one point of the primitive to be arranged first, and other than that, the attributes of the primitive (the ones that are automatically determined by the structure are set). You can do it just by setting (not required). For this reason, even in the simple example of FIG. 10, the data can be set by only about 1/3 of the method of setting the coordinates of each vertex and the edge data, and about 1/7 in the complicated example. Considering the amount of work such as calculation of coordinate values and modification of data, this difference becomes even larger.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a CAD method system for carrying out the present invention, FIG. 2 is a flow chart showing a shape defining procedure of a three-dimensional connected body, FIG. 3 is a diagram showing an example of a primitive, and FIG.
FIG. 5 is a diagram showing an example of a configuration table of a primitive, fifth
Drawing-Drawing 8 are figures showing the example of a display screen of duct structure arrangement,
9 and 10 are diagrams showing examples of display screens for setting duct dimension data. 1 ... Computer, 2 ... Display, 3 ... Light pen, 4 ... Tablet, 5 ... Operator.

Claims (3)

[Claims] 1. A three-dimensional articulated body shape defining system comprising a calculation means, an input means for giving input information to the calculation means, and an output means for outputting a calculation result by the calculation means. A process of defining a geometrical relationship with the basic constituent elements of the connected body and holding it in the calculation means, the corresponding points of the bonding surfaces of the basic constituent elements to be bonded, which are output to the output means, respectively, It comprises a process of forming a shape of a three-dimensional connected body based on the topological relationship by instructing with an input means, and a process of giving setting data of each part to the formed three-dimensional connected body. A method for defining the shape of a three-dimensional connected body characterized by: 2. A process for assigning a position and a direction of a basic constituent element arranged at the beginning of the shape definition of a three-dimensional connected body prior to the forming process. A method for defining the shape of a three-dimensional connected body according to item. 3. The third step of the three-dimensional connected body according to claim 1, wherein the third step includes a process of giving a position and a direction of a basic constituent element arranged first in the shape definition as a metric structure. Shape definition method.