JPH11242754A - Three-dimensional design according to stereoscopic vision shape input and part formation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically design a part that constitutes a three-dimensional virtual object and to convert it into data to be sent to a CAM system by using a device that enables stereoscopic vision. SOLUTION: Liquid crystal shutter type eyeglasses 2 is used as a device to see stereoscopic vision. An image for a left eye and an image for right eye are alternately shown on a CRT display 5 of an electronic computer 4 and the image is alternately reflected on the left lens and the right lens of the eyeglasses 2 while synchronizing with them. Thus, it is possible to see the stereoscopic vision of a virtual object 6 and a designer 1 operates a mouse 8 moving three-dimensionally and designates a point in space by freely moving a mouse cursor 7 in threedimensional space. A line segment is arranged in space by automatically connecting two designated points with the line segment and simultaneously recording it on the computer 4 and the object 6 is constructed by designating direct coordinates or directly connecting designed solid figures and recording them. A virtually manufactured object is rotationally moved and its shape is confirmed while designing in three-dimensional space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a virtual object in a three-dimensional space when designing using an electronic computer, and automatically determining the shapes of the parts constituting the virtual object without contradiction. The present invention relates to a design system that automatically outputs a design drawing (three-view drawing) for automatically constructing a virtual object and directly links to a CAM.

[0002]

2. Description of the Related Art A conventional design system using a computer is a system in which a procedure performed in a conventional manner is mechanized, and a pseudo three-dimensional image is created from design data.

[0003]

In the conventional method, the shape of an object to be constructed is converted into a two-dimensional image in the mind of a designer, and then input to a design system. Was re-converted to a three-dimensional appearance using a pseudo display method. This means that the actually devised shape is converted twice, and in order to create a design drawing as originally imagined, it is necessary to take into account those conversions and practice training. Was meant to be. In addition, the pseudo three-dimensional image three-dimensionally expressed on a plane has a surface in which it is difficult to accurately recognize the shape of the constructed object due to distortion due to an angle from the viewpoint.

[0004] In order to solve the above problems, the inventors of the present invention thought that it is basically desirable to use the following method. Since the object manufactured after the design is a three-dimensional object, the design may be performed in three dimensions from the beginning. However, a display device for displaying images directly in a space has not been developed so far, so that stereoscopic viewing using binocular parallax or monocular cues may be performed.

To use binocular parallax, images corresponding to the right and left eyes are calculated and displayed on a CRT display, and only the image for the right eye is displayed for the right eye, and the left eye is displayed for the left eye. It is sufficient that only the image for the eye arrives. Usually, two graphics screens of the computer are prepared, and are assigned to the right eye and the left eye, respectively. If the right eye and the left eye are switched by the liquid crystal shutter glasses in synchronization with the switching, stereoscopic vision using binocular parallax becomes possible. Alternatively, two-screen liquid crystal transmissive displays can be superimposed, and the right eye can see the right eye display and the left eye can see the left eye display using a deflecting lens. Become. Alternatively, stereoscopic vision is possible by displaying images corresponding to the right and left eyes on a head-mounted goggle-type small liquid crystal display. All of these devices for stereoscopic viewing are commercially available, and by using them, stereoscopic viewing can be easily performed.

[0006] The present invention has been made in view of the above points,
From a three-dimensional virtual object drawn like a real object in a three-dimensional space, parts that can constitute it are automatically designed and converted as data to be sent to a CAM system. at the same time,
An object of the present invention is to obtain software for performing output for a CAM in the form of a three-view drawing of a front view, a plan view, and a side view which is employed in a conventional design system.

[0007]

Means for Solving the Problems Using a device capable of stereoscopic vision, design is performed while stereoscopically viewing as a three-dimensional virtual object in a three-dimensional space. In the present invention, liquid crystal shutter glasses are used as a device for stereoscopic vision. The left-eye image and the right-eye image are alternately displayed on the CRT display of the computer. In synchronization with this, the images are alternately projected on the left and right eyes of the liquid crystal shutter glasses. This enables the virtual object to be stereoscopically viewed. that time,
Using a stereoscopic mouse cursor that has already been developed and put into practical use, stereoscopically view in a three-dimensional space according to its input function, directly specify coordinates, or directly join designed solid figures and store them. By constructing virtual objects.

[0008]

[Operation] The designer operates the mouse which moves three-dimensionally to freely move the mouse cursor in the three-dimensional space, and designates a point in the space. Two points specified in the space are automatically connected by a line segment, and simultaneously recorded on a computer, thereby arranging the line segment in the space. The curve can also be approximated by a function. In a space, whether a line segment can exist geometrically is determined instantly, and if not, a warning to the designer is given by changing the color of the line segment. Emit. It can be similarly determined whether the objects to be joined have geometric inconsistency. While designing in the three-dimensional space, the designer rotates and moves the virtually manufactured object to check its shape. When the design is completed, the design drawing is displayed and printed in the conventional front view, plan view, and side view format. In addition, it is automatically disassembled from the external view designed by the designer into parts having the necessary thickness and output.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. To enable stereoscopic viewing, designers wear liquid crystal shutter glasses. The designer can move the mouse cursor three-dimensionally in the three-dimensional space (the real space in front of the display screen and the virtual space in the back of the screen) with the mouse.

[0010] The designer specifies an arbitrary point in the three-dimensional space and presses the space key on the keyboard. Then, one end of the line segment is fixed to the coordinates in the space, and the line segment is drawn from the point toward the mouse cursor. The designer moves the mouse cursor of the line segment to an arbitrary position and presses the space key of the keyboard again to fix the line segment in the space. By fixing line segments in the space, we build a solid as a wire frame model.

[0011] When the designer draws a line segment, the position relationship between the line segment and other line segments connected to the line segment indicates that all the line segments constituting the figure can be geometrically existing. The computer determines whether or not the color is different, and changes the color for each line segment according to the state. With this, a warning is given to the designer when a figure that cannot exist geometrically is drawn.

A designer can rotate a virtual object designed in a three-dimensional space at any angle in any direction while designing. This allows the designer to design while checking the overall shape. In addition, when connecting the line segments, there is a case where it is difficult to see and connect or join easily due to the angle. In such a case, by connecting the point to be connected by rotating the virtual object while fixing one end, the connection and joining can be easily performed.

[0013] The shape of the designed virtual object can be changed in such a manner as to be scraped off on a plane. In this way, it is possible to obtain a target shape by preparing a large virtual object in advance and performing an operation of cutting out or shaving it. Alternatively, a solid designed elsewhere can be added and synthesized.

The designed virtual object is cut out in consideration of the thickness of the material, and the shapes of the components constituting the object are automatically calculated. This is performed on the assumption that the calculated data is sent to the CAM system and is automatically manufactured. Therefore, by selecting the CAM to be output, calculation to the corresponding data format is also performed.

If necessary, after the design, display and printing are performed from the designed object in a so-called three-view diagram of a front view, a plan view, and a side view, which is used in the conventional design method. As a result, it can be used as a design system for manufacturing that has conventionally been performed manually. The dimensions can be automatically added to the three-view drawing by entering the scale.

If necessary, hidden line processing is performed to check the appearance of the designed object, and the object is converted from a wire frame model to a surface model and further to a solid model and displayed. At this time, by selecting the material and performing coloring according to the gloss and reflection depending on the position of the light source, the three-dimensional effect is increased, and the texture can be easily recognized.

FIG. 7 shows the basic operation of the above configuration.
This will be described with reference to the flowchart shown in FIG. (1) Check a coordinate change instruction from the mouse. (2) When the instruction is given, the three-dimensional coordinates of the mouse cursor are changed.

(3) Check the input from the keyboard.

(4) When the return key is pressed, a three-view drawing is displayed. (5) When the space key is pressed, the coordinates are fixed and the position moves to the next moving point. (6) When the P key is pressed, the shape of the component constituting the virtual object is calculated. (7) When the M key is pressed, hidden line processing is performed on the virtual object to express the texture and three-dimensional appearance of the object.

[0020]

[Effects of the Invention] (1) Even those who have fully learned the design of architects, etc., those who are engaged in design work, or those who are not familiar with design, try trial and error while checking the shape intuitively. You can design what you imagine. (2) Like clay work, three-dimensional design of a shape by shaving from a rough thing and design by addition and synthesis can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a design system according to the present invention.

FIG. 2 is an explanatory diagram showing a state in which design is performed according to the present invention.

FIG. 3 is an example of calculating binocular parallax for stereoscopically viewing an object designed according to the present invention. FIG. 9 is an explanatory diagram also showing a case where a rotational movement is performed.

FIG. 4 is an example in which the shape of a virtual object being designed is changed by cutting according to the present invention.

FIG. 5 is an example in which the shape of a part that can constitute a virtual object designed according to the present invention is calculated and extracted.

FIG. 6 is an example in which a virtual object designed according to the present invention is output in three views of a front view, a plan view, and a side view.

FIG. 7 is a flowchart of the present invention.

FIG. 8 is an example in which a three-dimensional model expressing a virtual object designed according to the present invention is changed.

[Explanation of symbols]

 1 designer 2 liquid crystal shutter glasses 3 liquid crystal shutter glasses control board 4 arithmetic processing unit 5 display device 6 virtual object 7 ‥‥‥‥ Virtual 3D cursor 8 ‥‥‥‥ 3D mouse 9 ‥‥‥‥ Parts 10 ‥‥‥‥ Cut object 11 ‥‥‥‥ Wireframe model 12 ‥‥‥‥ Solid model

Claims (5)

[Claims] 1. A direct three-dimensional design method in a three-dimensional space to which stereoscopic vision is applied. 2. A method for automatically judging whether or not a designed solid configuration has a geometrical contradiction. 3. A method for converting a virtual object designed by a wire frame model into a solid model. 4. A method for consistently changing the shape of a three-dimensionally constructed object by directly adding or cutting a three-dimensional portion to the constructed object. 5. A method of connecting a CAM with the output of a design drawing of a part of a three-dimensional object designed by stereoscopic vision.