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Chuck_De_Sylva
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More on Z Pass Fill Requirements

The Z only pass can be combined with front to back sorting to reduce Z fill requirements. Since this is a Z only pass you do not need to be concerned about state change overhead induced by sorting. Adding occlusion query with the bounding box test to the Z only pass for complex objects will further improve results. When objects are determined to be not visible in the Z pass be sure to flag them so that they can be skipped in the final color pass as well.
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For more about this, see the complete Intel GMA 3000 and X3000 Developer's Guide.

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