JPS6237783A - Input method for 3-dimensional form - Google Patents

Abstract

PURPOSE:To ensure the accurate input of a 3-dimensional form with no time nor labor and to improve the input efficiency of data, by using a section cut with an XY plane to perform a graphic input and displaying the 3-dimensional form which is formed gradually in the form of a perspective drawing. CONSTITUTION:The Z coordinate initial value and the space between sections are set to a Z coordinate initial value setting part 1 and a Z coordinate space setting part 2 of a system respectively. Then a 3-dimensional section form is set on a tablet 3 by a stylus pen 4 and then stored in a section storage part 6 and then in a section gathering storage part 10 via a section plane switching part 9. Here an arithmetic part 11 calculates the set values given from both setting parts 1 and 2 and the value of a section sheet number storage part 8. The results of these arithmetic operations are stored at a time. Then a section form is produced and a post passing position is set by means of the pen 4 to be stored in an address of the part 10. A 3-dimensional perspective drawing which is formed gradually is displayed on a display part 15 via a perspective drawing producing part 14. Then a 3-dimensional form is supplied accurately to the part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a three-dimensional shape input method, and particularly to a three-dimensional shape input method for CAE, graphic design, animation, etc. This invention relates to a three-dimensional (3D) shape input method intended for use in fields where shape data must be processed by one person to be handled by a machine.

(Prior art and its problems) There are many difficult problems when inputting a three-dimensional shape into a computer. In the prior art, when inputting a shape, emphasis has been placed on how to give the shape inputter a three-dimensional effect and how to have the shape inputter specify three-dimensional coordinate values including depth information. That's it.

In order to achieve this goal, there are two methods: (i) creating a new solid by combining three-dimensional shapes that the computer already has, and (11) giving the shape inputter a perspective image of graph paper and creating a solid directly on top of this. Furthermore, (+++) A method of creating a solid that is symmetrical about one axis by rotating a plane figure around an arbitrary axis, and (lv) A method of creating a solid that is symmetrical about one axis, (lv) By sweeping a plane figure. How to create a prism that has that plane shape as a cross section, () By inputting the 3-view diagram, the total
Methods such as machine synthesis of three-dimensional objects have been proposed.

In the case of (1), the person inputting the shape cannot create the desired solid because the computer can only use the limited solids that the computer has. In the case of (IT), it is very difficult to specify the position and direction of the resulting bond, and in the case of (IT), the perspective view of the shape being created can be viewed from various angles, which is excellent in that it gives a three-dimensional impression to the person inputting the shape. However, by directly drawing a solid on a plane, accurate coordinate values must be entered, which makes it difficult to input a solid with the shape of the target p. Furthermore, in the case of <+i), only solid bodies symmetrical to the rotation axis can be input, and in the case of (iv), similarly, there is a problem that only prisms can be input.

In case (v), you can input a very accurate shape, but
There are problems in that it is difficult for the person inputting the shape to imagine a three-dimensional three-dimensional drawing, and the method is difficult to use for those who are not accustomed to design and drafting.

(Object of the Invention) An object of the present invention is to reduce the drawbacks of the prior art described above by inputting a figure using a cross section cut along the Another object of the present invention is to provide a three-dimensional shape input method that allows accurate three-dimensional shape input without wasting much time.

(Structure of the Invention) In the three-dimensional shape input method of the present invention, when inputting a three-dimensional shape using a measuring machine, the three-dimensional shape can be inputted by specifying the ordinal index of the line segments that constitute the cross-sectional shape of the object to be input. The first step is inputting the shape, modifying the input shape and fcb, and deleting the specified end points of the struts that serve to connect the cross sections on the line segment formed by the step ν, 1. a second step of specifying the distance between the end points; and a third step of interpolating between the points specified in the second step using either a straight line or a curved line to create the nj-post. The method includes a fourth step of creating and displaying a perspective view from a specified viewpoint in order to confirm the three-dimensional shape created in the first to third steps.

(Example) Next, the present invention will be explained in detail using the drawings.

FIG. 2 is a diagram showing the relationship between the input object, the user's viewpoint, and the user and the screen surface.

It is assumed that the shape input person's eyes are looking at the solid 31 as shown in Figure 32ai2 and are directing their line of sight perpendicularly to the Nice Play tube surface 30, and the coordinate axes X, Y, and Z are set as shown in the figure. . A predetermined solid is constructed by overlapping the cross sections along the Z axis.

At this time, there is a support that connects each cross section.

This support serves to connect the cross sections by passing through them on the line that represents the cross-sectional shape.

FIG. 1 is a block diagram of a three-dimensional shape input device showing an embodiment of the three-dimensional shape input method of the present invention.

In the figure, the three-dimensional shape input device includes a Z coordinate initial setting section 1, a two-coordinate interval setting section 2, a doublet 3, a stylus pen 4, a pulse generation section 5, a cross section storage section 6,
A reading synchronization unit 7, a cross-section number storage unit 8, a cross-section brane switching unit 9, a cross-section set storage unit 10, a calculation unit 11,
It is composed of a signal delay section 12, a final data storage section 13, a perspective diagram creation section 14, and a display section 15.

First, set the initial value of the %22 coordinate and the Z coordinate interval between the sections,
These are stored in the 2-coordinate initial setting section 1 and the Z-coordinate interval setting section 2, respectively. A three-dimensional cross-sectional shape is plotted on the tablet 3 using the stylus pen 4. Every time the stylus pen 4 is pressed against the tablet 3, a pulse generator 5 generates a pulse wave. At 4 o'clock, the XY coordinates on one tablet 3 are imported into the section storage section 6. Assuming that the arc is a line segment that can be drawn with one stroke, when an arc input end signal is sent using the stylus pen 4, the reading synchronization unit 7 is activated,
The data stored in the section storage section 6 is stored in the section set storage section 10. At this time, the initial value of the Z coordinate stored in the Z coordinate initial setting section 1 is added to the product of the two coordinate interval data stored in the Z coordinate interval setting section 2 and the value of the cross section number storage section 8. The calculation unit 11 performs the calculation and stores the results at the same time.

Once the cross-sectional shape is completed, the stylus pen 4 is used to set the post passage position. When the pillar definition start signal is received, a pointer for recording subsequent coordinates is set in the pillar address area of the section set storage unit 10. Next, as in the case of inputting the cross-sectional shape, the passing position of the pillar is picked up from the line segment.

These coordinate values are transmitted from the cross-section storage section 6 to the pillar address area and stored therein. Thereafter, upon receiving a signal indicating the completion of -section creation, the value in the section number storage section 8 is increased by one, and the section plane switching section 9 switches the planes in the section set storage section 10. At this time, the perspective drawing creation unit 14 operates at the same time, requests input of the viewpoint position, and when that value is input, creates a perspective view of the solid body constructed from the previous cross-sectional view from that viewpoint. , displayed on the display unit 15.

If the next cross-section scaling signal is received, the cross-section data enlarged so far is stored in the final data storage section 13, and the values in the Z coordinate initial setting section 1 and the Z coordinate interval setting section 2 are cleared.

By repeating the above operations, a three-dimensional shape can finally be created. Next, a case in which a function for providing auxiliary information is incorporated into this three-dimensional shape input method will be described in more detail.

Figure 3 is an example of an input solid and a transition diagram of its input cross-sectional view.
In the flowchart showing the steps of the process, the initial value ZO of the Z coordinate and the interval Zd between the cross sections are set (step 101).
). Next, the cross-sectional shape shown in FIG. 3(a) is input (step 1o2). For example, how to pick up the shape is (e) in the figure.
The order shown in K may be used, but in this case, h line segment 1-2
is defined as one arc, and line segment 3-4 is defined as one arc.

After inputting the cross-sectional shape shown in FIG. 3(a), the next step is to set the struts. This is done by picking up an appropriate number of points on the line (step 1o3). However, you need to be aware of the order in which you pick them up. When this work is completed, declare the end of the -section (step 1o4), but since there is no need to change ZQ, which is the initial value of the Viz coordinate, in the case of this figure, con
A t1nue declaration (step 106) is made (step 105), and only the interval Zd is changed. Next, Figure 3 (b
) pick up the arc in the manner described above to create a cross section of
Then define the position of the struts. At this time, the sectional view input earlier is displayed in a single layer, so you can use it. In the figure, the broken line portion shows the cross section of the window. When the input shown in FIG. 3(b) is completed, the input shown in FIG. 3(C) and (d) is performed. Each time a cross-section is entered manually, a three-dimensional perspective view consisting of the cross-sections input so far is displayed on a part of the screen (step 107). You can check if there are any.

Note that the struts can not only be connected by electric melting between specified end points between specified cross sections, but also can be interpolated by using a smooth command to create a smooth curve that passes between a series of end points.

(Effects of the Invention) As explained above, the present invention can relatively easily construct a three-dimensional shape (solid) on a plane, and can also create complicated shapes such as hollow shapes, so CAE
This has the effect of increasing the efficiency of data input in fields where three-dimensional shapes are handled by computers, such as , graphic design, and animation.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a three-dimensional shape input device showing an embodiment of the three-dimensional shape input method of the present invention, and FIG. 2 shows the relationship between the input object, the user's viewpoint, and the user and the screen surface. FIG. 3 is a transition diagram of an example of an input solid and its input sectional view, and FIG. 4 is a flow diagram showing its processing procedure. 1... Z coordinate initial installation section, 2... Z pressure interval setting section, 3... Tablet, 4...
...Stylus pen, 5...Pulse generator, 6
. . . Cross section storage section, 7 . . . Read synchronization section, 8 . . . Cross section number storage section, 9 . . . Cross section frame switching section, 10・・Cross section set memory section,
11... Arithmetic unit, 12... Signal delay unit, 13... Final data storage unit, 14... Perspective diagram creation unit, 15... Display section. ＼, 2nd Kokuonmenko 4 I

Claims (1)

[Claims] When inputting a three-dimensional shape using a computer, the first step is to input the shape or modify the input shape by specifying the coordinates of the line segments that make up the cross-sectional shape of the object you want to input. , a second step of specifying or deleting the end points of the struts that serve to connect cross sections on the line segments configured in the first step, and specifying the distance between the end points; and a second step of creating the struts. a third step of interpolating between the end points specified in the second step using either a straight line or a curve;
A three-dimensional shape input method comprising: a fourth step of creating and displaying a perspective view from a specified viewpoint in order to confirm the three-dimensional shape created in the first to third steps.