JPS6160173A - Calculation system for 3-dimensional graphic data - Google Patents

Abstract

PURPOSE:To facilitate an input of a 3-dimensional graphic form by extracting data on horizontal, vertical and oblique segments out of the 2-dimensional data on plural projection surfaces of a 3-dimensional graphic form to a projection surface through the segment coordinates and converting those segment data into the 3-dimensional data via a both-relation table. CONSTITUTION:The plan, the front view and the side view of a 3-dimensional graphic form are stored in a 2-dimensional data storage area 4 respectively through a 2-dimensional data input part 1. A segment data extracting pat extracts a segment for each drawing and detects the both-end coordinates of a segment to decide whether this extracted segment is horizontal, vertical or oblique to the corresponding drawing. Then this segment is stored in a segment data store area 5. The relations of segments among three drawings are registered to a projection graphic relation table 6. A 3-dimensional data calculating part 8 checks whether the segment data of each drawing is coincident or not with the data on the table 6 and specifies a 3-dimensional segment. Then the coordinates of the specific segment are outputted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a system for processing figures using an information processing device such as a CAD system, and particularly relates to a method for automatically outputting a three-dimensional figure from a two-dimensional figure. be.

[Conventional technology]

A CAD system that uses a computer to perform design work in an interactive manner uses a graphic display as an output device.
A device as shown in FIG. 2 is used, which uses a light pen, data tablet, keyboard, etc. as an input device. When attempting to process a three-dimensional figure using such a device, the conventional method for inputting the data of the three-dimensional figure into the entire system is for the operator to directly input the three-dimensional coordinates using a keyboard, or depending on the figure. Some methods have been used, such as creating a plane figure by inputting it as a two-dimensional figure, and then moving it to a three-dimensional figure to obtain a three-dimensional figure, but none of these methods is easy.

[Problem that the invention seeks to solve]

In this way, conventionally inputting three-dimensional figures into a system is an inefficient task that requires time and labor from the operator.
This was seen as one of the obstacles to the practical application of 3D graphics processing systems. In order to solve these problems in the present invention, an operator can automatically scan a projected figure of a target three-dimensional figure, for example, a two-dimensional figure such as a trigonometric view used in mechanical drawing, etc. A three-dimensional figure data calculation method is obtained in which three-dimensional figure data is output.

[Means to solve problems]

The means to solve such problems is as described in the scope of Kagaku Zhaogu. Means for registering the relationship between whether a line segment appears as a horizontal, vertical, diagonal, or diagonal line segment with respect to a projection surface or a coordinate axis, and storing projection figures for a plurality of projection surfaces of an Ivf redundant three-dimensional figure as two-dimensional data. means for extracting line segment data from the two-dimensional data, and means for calculating three-dimensional line segments, and the means for extracting line segment data from the two-dimensional data Means for calculating the three-dimensional line segment by calculating whether the line segment is horizontal, perpendicular, or oblique to the pitch plane or coordinate axis of the % foot based on the coordinates of both ends of each line segment, and obtaining line segment data. compares the line segment data with the relation table between projection figures, determines it as a three-dimensional line segment, and outputs the line segment as a three-dimensional data tube. This is a calculation method for graphic data.

〔Example〕

The present invention will be explained in detail below with reference to Examples.

FIG. 1 is a functional block diagram showing an embodiment of the present invention.
i is a two-dimensional data input section, 2 is a line segment data extraction section, 3 is a storage section, 4 is a two-dimensional data storage area of the storage section, 5 is a line segment data storage area of the storage section, 6 is a projection source of the storage section 7 is an intersection calculation section, 8 is a three-dimensional data calculation section, and 9 is an output section. This example is based on the trigonometry of drafting.When the operator inputs a three-dimensional diagram, a three-dimensional figure is automatically output.Basically, all of this processing is based on the following principle. be.

That is, when a three-dimensional figure is expressed by a three-view diagram using trigonometry, the line segments represented in each three-view diagram have relationships as shown in Table 1.

・ 4 ・ For example, if the three-dimensional figure shown in Figure 3 is the plan view of Figure 4 (a),
When expressed as the front view in (b) and the side view in (c),
The line segment parallel to the X-axis in Figure 3 ■ is shown in Table 1 ■ as a horizontal line in the plan view and front view, but is not displayed (it becomes a point) in the side view, but is the line shown in Figure 3 ■. As shown in Table 1 (■), there are general characteristics such as vertical lines in the plan view, not displayed in the front view, but horizontal lines in the side view.

Therefore, the two-dimensional figures shown in Figures 4 (a) and (b) are displayed on the subtraction machine.
, (c) are input, the line segments on the three-dimensional figure can be identified by extracting the properties of each line segment of the two-dimensional figure and comparing it with the clothing.

The processing procedure of this embodiment will be explained below.

Now, the operator uses a tablet etc. to
When three-view drawings such as those shown in (b) and (c) are input into the system of the present invention, the two-dimensional data input section 1 stores them in the two-dimensional data storage area 4 of the storage section for each drawing.

Next, the line segment data extraction unit extracts line segments one by one for each drawing from the input data, detects the coordinates of both end points of the line segment, and determines whether the line segment is horizontal (2)) vertical in the drawing. The force indicated by the diagonal line is determined, and the determination result is stored in the line segment data storage area of the storage section along with the coordinates of both ends of the line segment.

At this time, the intersection calculation unit 7 checks whether or not line segments intersect with each other in each drawing, and if they intersect, it completely divides one line segment at the intersection, and creates multiple small lines according to the divided combination. All segments are calculated and added to the processing of the line segment data extraction unit. In this process, in two-dimensional drawings, multiple line segments may be displayed as one line segment in three dimensions, so the presence or absence of intersections is detected on each drawing, and three or more points including both ends are detected. If the line segment is divided at an intersection, processing is performed assuming that a plurality of line segments exist.

The three-dimensional data calculation section 8 refers to the line segment data of each three-dimensional view obtained in this way and the projection figure relationship table 6 in the memory Ttlf 3, adds the percentage of the three-dimensional line segments, and calculates the coordinates. Output. The line segment relationships in the three-view diagrams in Table 1 mentioned above are registered in the projection figure relationship table 6, and the three-dimensional data calculation unit 8 stores the line segment data in each of the figures in the same relationship table 6. Check whether it matches the data above.

For example, the line segment (2X1・y
b) - (π.・ya) is a diagonal line in the same figure, and in the front view of the same figure (b), the line segment (x,・'*) +
(zs・ga) is indicated by diagonal lines in the figure, (c)
The line segment (y,・z＠) e (Yb・”e) is shaded in the figure, and if the conditions of ■ in Table 1 are met and “z W
Since the coordinates of 's* also match, it can be identified as the same line segment in the main figure, and the coordinate data of both ends in three dimensions (z, ・V, ・'a) e (Z, ・y, ・z,) is also available immediately. In this manner, the three-dimensional data calculation unit sequentially calculates data as a three-dimensional figure and stores it in the storage unit to obtain data as a complete three-dimensional figure.

〔Effect of the invention〕

As is clear from the above explanation, this method uses CA
It makes it extremely easy to input three-dimensional figures in the D system, etc., and dramatically improves the figure processing ability. However, since each drawing is checked in detail for original figures such as the three-view drawing, the accuracy of the drafting can be easily improved.

Additionally, if a three-dimensional model is obtained using this formula, isometric and perspective drawings can be easily obtained based on the three-dimensional data, so operators can automatically obtain these drawings simply by performing two-dimensional drawings. You will be able to do this.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of a graphic processing system, FIG. 3 is a diagram showing an example of a three-dimensional figure processed by the present invention, and FIG. In the three-dimensional view of the solid shown in the figure, (a) is a plan view, (b) is a front view, and (C) is I11.
It is a front view. 1... Two-dimensional data input section, 2... Line segment data extraction section, 3... Storage section, 4... Two-dimensional data storage area, 5... Line segment data storage area, 6.
・・Source figure relation table storage area, 7.. Also point calculation section, 8.. Three-dimensional data calculation section, 9..
・Console, lO...output section, 11...
Graphic display, 12... Refresh memory, 13... Control section, 14... Pattern generation section, 15... Console control section, 16... Keyboard, 17... Tablet, 18... Interface Capital, 19...Central processing unit・11・AIl:C No.,,3 Figure 4 Figure ('a) 2! c) (ycZa) 457-

Claims (1)

[Claims] When line segments constituting a three-dimensional figure are projected onto multiple projection planes, whether the line segment on the projection figure appears horizontally, vertically, or diagonally with respect to a specific projection plane or coordinate axis. means for registering relationships as a table; means for storing projected figures on a plurality of projection planes of a specific three-dimensional figure as two-dimensional data; means for extracting line segment data from the two-dimensional data; The means for extracting line segment data from the two-dimensional data is based on the coordinates of both ends of each line segment of the two-dimensional data, and the means for extracting line segment data from the two-dimensional data determines whether the line segment is relative to a specific projection plane or coordinate axis. The means for calculating the three-dimensional line segment calculates whether it is horizontal, vertical, or diagonal, and calculates the three-dimensional line segment by comparing the line segment data with the relationship table between projected figures. A three-dimensional figure data calculation method characterized by specifying a line segment and outputting three-dimensional data on the line segment.