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This topic is mostly independent of OpenGL - all graphics systems have to clip, render lines, etc.

  1. Slide set 21 - Implementation I
  2. Slide set 22 - Implementation II

Advantage of using Cohen-Sutherland:

  1. You always have to use the detailed clipping since sometimes the CS algotihm reports that it doesn't know.
  2. However often it can classify the line segment (or the box with everything inside) as either completely in or else completely out.
  3. In that case, the rest of the pipeline is faster.
  4. However you have to write more lines of code.
  5. You don't have to know how this works, only what its purpose is.

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