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This shows a very simple visibility culling system for a heightfield terrain. Only the cells that are a certain distance from the center point of the camera are drawn. In the video I have pulled the camera back so that the clipping circle can be easily seen.

While this version of visibility testing is easy and quick to write, it allows many cells that aren't actually visible through. It does make a good first pass for a more rigorous test, though.

This video is part of my article "Practical Direct3D Programming", which you can read at: http://www.gamedevdad.com/?p=407