Visibility Problem
The problem of visibility is to determine which transformed, illuminated, and projected primitives
contribute to pixels on the screen. In many cases, however, rather than solving the direct problem
of determining what is visible, we will instead address the converse problem of eliminating those
primitives that are invisible.
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A primitive can be invisible for one of three reasons:
- It lies outside of the field of view
- It is a back-facing component of a closed object
- It is occluded by some object closer to the viewpoint
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