JPH03252874A - Stereoscopic display processing system for plane - Google Patents

Abstract

PURPOSE:To display stereoscopically a given plane figure at high speed by drawing a virtual line in a generatrix direction, and drawing only a necessary line based on the relation between the line and the original plane figure. CONSTITUTION:When plane figure data 11 showing the outline of the plane figure is given, and it is displayed stereoscopically, the stereoscopic figure to be outputted to a display 16 is generated by a generatrix display processing part 13 to display a part to show the external form of the generatrix and a base outline display processing part 14 to display the visible part of the outline of the base. Then, by the generatrix display processing part 13 and the base outline display processing part 14, the virtual lines are drawn in the generatrix direction, and the line to be displayed and the line not to be displayed are distinguished from each other on the basis of the relation between these lines and the original plane figure, and only the necessary lines are selected and drawn. Thus, high-speed stereoscopic display can be realized.

Description

[Detailed Description of the Invention] [Summary] A three-dimensional display processing method for a two-dimensional figure in a computer system that three-dimensionally displays a two-dimensional figure including characters. With a purpose.

Regarding the generatrix direction line drawn from the candidate point where the generatrix can be drawn in the original plane figure, when the point immediately below the candidate point is not inside the original plane figure, the correspondence between the point that intersects with the two-dimensional plane figure or the figure that becomes the base The generatrix display processing unit draws a generatrix from the candidate point to the closest point among the points, and a line is drawn in the generatrix direction from the point on the outline between each candidate point of the figure that becomes the base corresponding to the 9-dimensional plane figure. , and if the point immediately above is not inside the original plane figure, then the corresponding bottom plane is drawn on the condition that there is no intersection between the generatrix virtually drawn to the corresponding point of the 1-dimensional plane figure and the original plane figure. and a bottom contour display processing section that displays the contour of the figure.

The bottom of the tank is created so that a given planar figure is displayed in three dimensions.

[Industrial application field]

The present invention relates to a three-dimensional display processing method for a two-dimensional figure in a computer system that three-dimensionally displays a two-dimensional figure containing three characters.

[Conventional technology]

FIG. 6 shows an example of the prior art.

For example, when displaying three-dimensional characters and figures in a two-character figure editing device, conventional nine-dimensional plane figures (plane figures include character figures) are used.

By stacking many layers, it was made to look three-dimensional. That is, as shown in FIG. 6, when displaying a planar figure X three-dimensionally, starting from the bottom figure Y corresponding to the plane figure They were stacked up to plane figure X and processed to make it look three-dimensional.

Furthermore, when the planar figure to be handled is limited to a specific shape, coordinate information regarding all contours for displaying the figure in three-dimensional form is prepared in advance as a standard.

[Problem to be solved by the invention]

As shown in Figure 6, the method of stacking plane figures in multiple layers to display them three-dimensionally does not pose much of a problem when the height of the three-dimensional column is low, but when the height of the three-dimensional column is high, two figures are combined into one. There was a problem in that 2 display was slow because the dots were stacked one by one.

In addition, the method of preparing all contour information in advance for 3D display cannot display an unspecified number of planar figures in 3D.

Another problem was that the amount of data increased.

An object of the present invention is to solve the above-mentioned problems and to enable a given planar figure to be displayed three-dimensionally and at high speed.

[Means to solve the problem]

FIG. 1 shows an example of the configuration of the present invention.

In FIG. 1, 10 is a processing device including a CPU and memory, 11 is planar graphic data to be displayed in 3D, 12 is a graphic editing processing unit that performs editing processing for 3D display, and 13 is a generatrix display processing unit. , 14 represents a bottom contour display processing section, 15 represents an output buffer in which data for stereoscopic display is stored, and 16 represents a display.

In the present invention, planar figure data 11 indicating the outline of a planar figure
is given, and when performing a three-dimensional display of this, a generatrix display processing section 13 that displays the part showing the outline of the generatrix, and a bottom contour display processing section 14 that displays the part that can be seen as the outline of the bottom surface, display it on the display 16. Generate a three-dimensional figure to output.

Therefore, regarding the generatrix direction line drawn from a candidate point at which a generatrix can be drawn in a two-dimensional plane figure, when the point directly below the candidate point is not inside the original plane figure, the generatrix display processing unit 13 converts it into a nine-dimensional plane figure. A process is performed to draw a generatrix from the candidate point to the closest point among the intersection points or the corresponding points of the figures serving as the base.

In addition, the bottom contour display processing unit 14 pulls up a line in the generatrix direction from the points between the candidate points of the bottom figure corresponding to the binary plane figure, and when the point immediately above is not inside the original plane figure, Processing is performed to display the contour of the corresponding bottom figure on the condition that there is no intersection between the generatrix virtually drawn to the corresponding point of the one-dimensional plane figure and the original plane figure.

L Effect] In order to display a planar figure three-dimensionally, it is necessary to prevent hidden lines among the base and generatrix lines from being displayed.

In the present invention, the generatrix display processing section 13 and the bottom contour display processing section 4 draw virtual lines in the direction of the generatrix, and distinguish between lines that should be displayed and lines that should not be displayed based on the relationship between the virtual lines and the original planar figure. Separately, since only the necessary lines are selected and drawn, high-speed stereoscopic display becomes possible.

〔Example〕

FIG. 2 is a processing flow of a generatrix display processing section according to an embodiment of the present invention, FIG. 3 is a processing flow of a bottom contour display processing section according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. Example of generatrix display processing according to example FIG. 5 shows an example of bottom contour display processing according to an embodiment of the present invention.

The processing of the busbar display processing section 13 shown in FIG. 1 will be explained with reference to FIGS. 2 and 4. ■～■ in the following explanation
corresponds to processes ① to ② shown in FIG.

(2) Assume that contour information of a plane figure χ as shown in FIG. 4(a) is given. First, candidate points are selected as candidates for the generatrix to be displayed.The candidate points are the contact point A between the line in the generatrix direction and the planar figure X, and the bending points B, C, and D where the line bends. The following processing is performed for each candidate point.

■ Virtually draw a half-line from each candidate point in the direction of the generatrix, and find the intersection of the half-line and the original figure. That is, as shown in FIG. 4 (b).

Half line in the direction of the generatrix11. f2. ff13. I! , 4
Find the intersection with the plane figure X by subtracting . In this example,
A line 13 drawn from candidate point C intersects planar figure X at intersection M.

■ Determine whether the number of intersections is odd or even. 0 is an even number. Also, if the line in the generatrix direction and the plane figure It will be inside. Therefore, the process moves to process (2) without displaying the bus line. In the example shown in FIG.

The generatrix drawn down from candidate point C is removed from the display target.

■ If there is an even number of intersections, draw a generatrix that is displayed as 1 as shown in quadratic order.The distance from the candidate point to the closest intersection between the half line in the generatrix direction and the original planar figure.

Calculate the distance from the candidate point to the corresponding point on the bottom figure, and draw the generating line to the closest point. This results in Figure 4 (C)
As shown in the mother IKflll! 2.14 will be displayed.

(2) The above process is performed for each candidate point, and when the process for all candidate points is completed, the process moves to the primary bottom contour display process.

Next, the processing of the bottom contour display processing section 14 shown in FIG.
This will be explained according to FIGS. 3 and 5.

■~■ in the following explanation refers to the processes ■~■ shown in Figure 3.
corresponds to

(2) When the busbar display process is completed, the state of the figure to be displayed in two is as shown in FIG. 5(a). Therefore, first, the position of the bottom figure Y with respect to the plane figure X is determined. Then, candidate points A', B', C' in the bottom figure Y corresponding to the candidate points A, B, C, D in the plane figure X,
Intersection points E and F between D' and the generatrix drawn in the generatrix display process and the bottom figure Y are determined.

(2) Let the intermediate points of A° to D°, E, and F obtained in process (2) be P1 to P6. In order to check whether these points on the outline of the bottom figure Y are inside the plane figure Find the intersection with figure X.

■ Determine whether the number of intersections is odd or even. If the number is odd,
The points on the outline will be inside the plane figure X, so do not display the outline.

Move on to processing ■.

■ If the number of intersection points is even, draw a virtual line from the points P1 to P6 on each contour of the base figure Y to the corresponding point in the one-dimensional plane figure Check if it intersects with

■ If there is an intersection, it means that the outline is hidden, so one is not displayed and the process moves to process (■). In the 5th @(b), 1 point P2. P3. The outline of the bottom figure Y including P5 and P6 is excluded from the display target.

■Display the contour of the bottom figure of the part that does not intersect with the original plane figure X. In this example, the contour from A' to Bo, including one point P1, and the contour from E to Do, including point P4, are displayed.

(2) The above processing is performed for the points P1 to P6 of each contour, and when all the processing is completed, the stereoscopic display processing is ended. Through the above processing, a three-dimensional display figure as shown in FIG. 5(c) is finally created.

〔Effect of the invention〕

As explained above, according to the present invention, a two-dimensional figure is given and its three-dimensional display can be performed at high speed.

Processing flow of processing section FIG. 4 is an example of bus line display processing according to an embodiment of the present invention.

FIG. 5 is an example of bottom contour display processing according to an embodiment of the present invention.

FIG. 6 shows an example of the prior art.

In the figure, 10 is a processing device, 11 is a plane graphic data 12 is a graphic editing processing section, 13 is a generatrix display processing section 14, a bottom contour display processing section, and 15 is an output buffer.

16 represents a display.

Claims (1)

[Claims] In a three-dimensional display processing method for a two-dimensional figure in a computer system that three-dimensionally displays a two-dimensional figure including characters, a candidate point is determined for a generatrix direction line drawn from a candidate point at which a generatrix can be drawn in the original two-dimensional figure. When the point immediately below is not inside the original planar figure, a generating line display process that draws the generating line from the candidate point to the closest point of the point that intersects with the original planar figure or the corresponding point of the figure that becomes the base. Part (13) and a line is pulled up in the generatrix direction from a point on the outline between each candidate point of the figure that becomes the base corresponding to the original plane figure, and when the point immediately above is not inside the original plane figure, , a bottom contour display processing unit (14) that displays the contour of the corresponding bottom figure on the condition that there is no intersection between the generatrix virtually drawn to the corresponding point of the original plane figure and the original plane figure; A three-dimensional display processing method for a planar figure, characterized in that a given planar figure is displayed in three-dimensional form.