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Occlusion culling
This article is a stub, it contains information that doesn't explain subject fully.
Occlusion culling is a process of removing
objects hidden behind other objects (and therefore reducing the number of
primitives to be rendered).
Big topic
This topic is too big to be discussed in Web-format, so here are the resources that can help with that:
There are two interesting papers describing algorithms in this area:
Zhang 98 and
Wang, Agarwal, Har-Peled 00
Gamasutra has a
feature devoted to occlusion culling.
See also
Frustum culling
Bounding volume