2D and 3D GRAPHICS - Scene attribute

Scene attribute

Scene attributes are applied to all 3D graphics during rendering. Scene attributes provide such features as hidden surface removal and sorting scheme algorithms. For example:

zBuffer rendering can turn the visibility check on or off based on a THiddenSurfaceRemovalControl instance.
Prioritysorting rendering gets its sorting scheme from a THiddenSurfaceRemovalControl instance.
Vector devices may get a hidden line removal algorithm from a THiddenSurfaceRemovalControl instance.

Figure 220 shows the THiddenSurfaceRemovalControl class and its GetHiddenSurfaceControl function. This class provides an option for the default z buffer rendering. The GetHiddenSurfaceControl function turns the zBuffer checking for hidden surfaces on and off. When on, hidden lines are sought out and those that are found are not rendered. When off, hidden lines are not sought out and are, therefore, rendered.

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