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Sample program

The figure below shows an example of object display using the sample program “sample_4_5” using a window. Object 1 is a rectangular plate polygon, and object 2 is a cubic polygon. They are arranged so that they intersect each other at a certain Z coordinate.
The display when the window is set using the library function “slWindow” is d) in the figure below. Object 1 is set to display outside the window area, and object 2 is set to display inside the window area (this setting is described below).

Figure 4-17 Example of object display using a window

Note 1) Object 1 is displayed outside the window
Note 2) Object 2 is displayed in the window

List 4-6 sample_4_5: Example of displaying objects using windows

Flow 4-5 sample_4_5: Window display flowchart

In SGL, you can show / hide objects in and out of the window. This switching can be set for each polygon surface as a polygon attribute.
Details will be given in “Chapter 7: Polygon surface attributes”, but here we introduce the part corresponding to the polygon surface attributes in the data file “polygon.c” used in the sample program.

List 4-7 polygon.c: Polygon attributes related to window display

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