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hieracial z buffering problem

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i'm currently writing a hieracial z buffer with a octree to do the hidden face removal, however , the hieracical z buffer (which is a more than 1024x1024 array)consumes a large amount of time to initialize it to all zero every frame. its benefit in hidden face removal is now being overshadowed by the memory access time, i dont why.... any other solution about the z buffer, or any good solution to implement the hierachical visibility algorithm....... thx

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