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derek7

Are there common occlusion testing available?

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It seem there are no good admittedly occlustion.like z-check,it need to access depth buffer it is slow, so no good .

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Well, you've got occlusion queries. Technically that does access the Z-buffer, but using the same hardware for standard Z-test (i.e. the extremely fast stuff).

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Z-checking is a great idea in theory. The problem is that z-checking requires direct access to
the depth buffer. If we are hardware rendering, then this is troublesome. Different graphics cards
may store the depth information in a proprietary format. The access is often very slow ¡ª about
twice as slow as accessing main system RAM, or slower.
Some hardware is capable of performing z-checks for us. Even in this case, we still have a
problem of pipelining.


So you could give me detail about popular solution for z-checking or it just is still "in problem"?

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