JPH11272889A - Three-dimensional cad system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To designate an optional position by watching ambient relation to an appropriately designed curved surface and to easily arrange a three- dimensional CAD model by seeking for a corresponding point on a plane based on a moving direction and movement quantity which are designated by a movement indicating means and displaying a point in an identifiable form. SOLUTION: A dedicated position coordinate specification symbol is arranged at an appropriate position of a solid model. Next, when a surface model is selected, the dedicated position coordinate specification symbol is shown at the position of an endpoint node where an X coordinate value becomes the smallest on the surface model. Whether a three-dimensional CAD model whose part is arranged is the surface model is decided (S81). When it is the surface model, the position coordinate specification symbol is arranged at an appropriate position on a plane that is an object (S83). When it is not the surface model, a plane that is an object is taken out according to a CAD command with a part of a three-dimensional CAD model arranged where it is desired to be arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function for arranging a first three-dimensional figure on a second three-dimensional figure in a three-dimensional CAD system.

[0002]

2. Description of the Related Art As a method of designating an arbitrary coordinate value in a conventional three-dimensional CAD, a design method developed in the following two-dimensional CAD is used. (1) Method of specifying arbitrary coordinate values by inputting coordinate values (2) Method of specifying end points of existing elements (3) Method of specifying equal division points of existing elements (4) Indication at an appropriate position with a mouse Designation by Kate (5) Method of designating the intersection of two or more existing elements However, it is very difficult to find the intended position and the position to be considered in the concept design at the initial stage of design using these methods. There is a situation where it is difficult to work to realize the original idea.

[0003]

To specify an arbitrary coordinate value in a three-dimensional CAD using a specification method developed in a two-dimensional CAD in a concept design in an early stage of the design,
There is a problem that it is very difficult to obtain an intended position and a position to be examined. It is an object of the present invention to easily arrange a three-dimensional CAD model by designating an arbitrary position while observing the surrounding relation with a curved surface appropriately designed in a three-dimensional space at the time of concept design using three-dimensional CAD. I do.

[0004]

The object of the present invention is to provide a selecting means for selecting one plane in a three-dimensional figure, a movement instructing means for designating a moving direction and a moving amount of one point on the selected plane, It is possible to solve the problem by providing a point position display means for obtaining a corresponding point on the surface based on the movement direction and the movement amount designated by the designation means, and displaying the point in an identifiable form.

[0005]

FIG. 1 is a system configuration diagram.
Reference numeral 10 denotes a processing device, 11 denotes a selection program for selecting one surface in a three-dimensional figure serving as a reference for arrangement processing. This is a point position display program for displaying in an identifiable form. Reference numeral 13 denotes a relative coordinate input program for inputting a relative distance from a point displayed in an identifiable form, and reference numeral 14 denotes an arrangement position calculation program for obtaining a point for arrangement processing.

Hereinafter, a procedure for determining a position for arranging components according to the present invention will be described in detail with reference to the drawings. FIG. 4 shows a position coordinate designation symbol 400 used in the present invention. The position coordinate designation symbol 400 includes an X axis, a Y axis,
The coordinate display 410 has an X coordinate value of the position coordinate designation symbol 400, the coordinate display 420 has a Y coordinate value of the position coordinate designation symbol 400, and the coordinate display 430 has a Z coordinate value of the position coordinate designation symbol 400. Is displayed.

The position coordinate designation symbol 4 used in the present invention
00 is shown in FIG. Coordinate display 610
Is the X coordinate value of the position coordinate designation symbol 400 and the coordinate display 6
20 indicates the Y coordinate value of the position coordinate designation symbol 400, and the coordinate display 630 indicates the Z coordinate value of the position coordinate designation symbol 400. Position coordinate designation symbol 400 with coordinate designation 640
Indicates whether the coordinate display is absolute coordinates or relative coordinates. The unit of the movement amount when the position coordinate designation symbol 400 moves is set in the input unit 650.

The position coordinate designation symbol 4 used in the present invention
FIG. 7 shows a process for obtaining the coordinate value of 00. First, at step 71, if the relative coordinates of the coordinate designation 640 of the dialog of FIG. 6 are designated, the procedure goes to step 72; otherwise, the procedure goes to step 73. In step 72, the absolute coordinates of the origin of the relative coordinates are obtained, and have the coordinate values in the format of the data structure 710. In step 73, the relative coordinate origin is set as the absolute coordinate origin, and has a coordinate value in the format of the data structure 700. FIG. 8 is a diagram illustrating the absolute coordinates and the relative coordinates.

A procedure for arranging a solid model B220 as a part on the surface model 210 of the solid model A200 shown in FIG. 2 will be described with reference to the display example of FIG. 3 and the flows of FIGS. First, at step 91, a position coordinate designation symbol 310 is arranged at an appropriate position on the solid model A200.

Next, at step 92, as shown in FIG. 3, when the surface model 300 is selected, at step 93, the position coordinate designating symbol is placed at the end point where the X coordinate value becomes the smallest on the surface model 300. 31
0 is displayed. The detailed procedure of steps 92 and 93 will be described with reference to FIG. In step 81, it is determined whether or not the three-dimensional CAD model on which the component is placed is a surface model. If the model is a surface model, the procedure goes to step 83; otherwise, the procedure goes to step.

In step 82, a target surface is extracted by a CAD command at a position where a part of the three-dimensional CAD model is to be arranged. In step 83, the position coordinate designation symbol is arranged at an appropriate position on the target surface. In step 84, since the target surface has data in the form of the data structure 800/810, the end point data of the selected surface is set as the origin of the position coordinate designation symbol. Therefore, the position coordinate designation symbol is displayed at the end position of the selected surface.

Next, at step 94, to move the position coordinate designation symbol 310 displayed at the end point of the surface,
The Y-axis of the position coordinate designation symbol 310 is designated by a mouse. Next, in step 95, the position coordinate designation symbol 31
The unit in which 0 moves is designated as the input unit 650 in FIG. Next, in step 96, the designated Y-axis coordinate value is changed by operating the mouse. As shown in FIG. 5, the minus direction or the plus direction is determined depending on whether the direction of the mouse operation is left or right, and the change amount of the coordinate value is determined based on the movement amount by the mouse operation.

Next, at step 97, since the Y axis is designated, the ZX plane 301 moves while cutting the surface model 300 by operating the mouse. next,
In step 98, the CAD system determines that the ZX plane 301
The intersection line between the object and the surface model 300 is calculated and displayed as follows. Equation representing a curved surface: z = f (x, y) Equation representing a ZX plane: y = a (a is an arbitrary numerical value), so that the intersection of the curved surface and the ZX plane is an end point 311
From (coordinate values: (x11, y11, z11)), when the ZX plane moves by Δy (y11 → y11 + Δy), y = y11 + Δyz z = f (x, y) = f (x, y11 + Δy) = g (x).

Next, at step 99, the ZX plane 301
Point 321 of intersection 340 between the object and surface model 300
Is displayed with the position coordinate designation symbol 320. Next, in step 910, since the intersection line 340 of the position to be arranged is displayed, the Z axis of the position coordinate designation symbol 320 is designated as the axis to be moved next. Next, in step 911, the unit in which the position coordinate designation symbol 320 moves is designated as the input unit 650 in FIG.

Next, in step 912, the designated Z-axis coordinate value is changed by operating the mouse. Next, in step 913, since the Z axis is specified,
The XY plane 302 cuts the surface model 300 by operating the mouse, and moves while crossing the intersection line 340.

Next, in step 914, the CAD system calculates the intersection between the XY plane 302 and the intersection line 340 as follows, and sets the coordinate value of the intersection as the coordinate value of the position coordinate designation symbol. I do. Equation representing the intersection line: z = g (x) Equation representing the XY plane: z = b (b is an arbitrary numerical value), so that the intersection of the intersection line and the XY plane is the starting point 321
From (coordinate values: (xs, ys, zs)), when the ZX plane moves by Δz (zs → zs + Δz), z = zs + Δz z = g (x), and zs + Δz = g (x ), The coordinate value of the intersection P331 on the X axis can be determined.

Next, in step 915, the XY plane 30
A position coordinate designation symbol 330 at the intersection of the intersection line 2 and the intersection line 340
Is displayed. Next, in step 916, if the position coordinate designation symbol 330 is the position where the component is to be placed, the coordinate value is determined. Next, in step 917, regarding the position of the displayed position coordinate designation symbol 320,
The final confirmation is determined. If the position is good, go to step 918. If not, go to step 92.

Next, at step 918, a mark is arranged at the position of the finally determined position coordinate designation symbol 320. As described above, as a method of designating an arbitrary coordinate value of the three-dimensional CAD model, the direction (x,
By performing the method of the present invention in which y, z) and the increment value in that direction are designated by a mouse, the coordinate values at which the three-dimensional CAD model is arranged can be very easily designated.

[0019]

As a method of designating an arbitrary coordinate value of the three-dimensional CAD at the concept design stage of the design work, a direction (x, y, z) desired to be moved by a mouse and an increment value of the direction according to the present invention. By using a mouse to specify the three-dimensional CA
The coordinate values for arranging the D model can be specified very easily, and the operability is very easy.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram

FIG. 2 is a component placement model.

FIG. 3 is a view for explaining a display example of one point on a surface;

FIG. 4 Symbol dedicated to position coordinate designation

FIG. 5 is a diagram showing a relationship between a mouse operation and a moving direction.

FIG. 6 shows an example of a dialog.

FIG. 7 is a processing flow for obtaining coordinate values of symbols.

FIG. 8 is a diagram illustrating absolute coordinates and relative coordinates.

FIG. 9 is a processing flow for obtaining a movement position on a surface (part 1);

FIG. 10 is a processing flow for obtaining a movement position on a surface (part 2);

FIG. 11 is a processing flow for obtaining a reference plane.

FIG. 12 is a data structure diagram of a surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Processing device 11 Surface selection program 12 Point position display program 13 Relative coordinate input program 14 Arrangement position calculation program 20 Display device 21 Mouse 22 Keyboard

Claims (5)

[Claims] 1. A selecting means for selecting one plane in a three-dimensional figure, a moving instructing means for instructing a moving direction and a moving amount of one point on the selected plane, a moving direction and a moving direction specified by the moving instructing means. A three-dimensional CAD system, comprising: a point position display unit for obtaining a corresponding point on the surface based on the movement amount and displaying the point in an identifiable form. 2. A distance input means for inputting relative coordinates from a point displayed in a form identifiable by the point position display means, and another three based on the input relative coordinates and the coordinates of the point.
A three-dimensional CAD system, comprising: an arrangement position calculating means for obtaining a position at which a three-dimensional figure is arranged. 3. The three-dimensional CAD system according to claim 2, wherein said point position display means displays a symbol indicating a coordinate system on a point on said surface. 4. The three-dimensional CAD system according to claim 1, wherein said movement instructing means is a mouse. 5. A means for operating a computer to select one plane in a three-dimensional figure, a movement instructing means for designating a moving direction and a moving amount of one point on the selected plane, and an instruction by said movement instructing means. A computer storing a program for causing a corresponding point on the surface to be determined based on the determined moving direction and the amount of movement, and functioning as point display means for displaying the point in an identifiable form. A readable storage medium.