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Funkymunky

Index/Vertex buffers, high low poly count

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Hi, what I am wondering is: are index buffers always faster? Or are they only beneficial when dealing with a high vertex count? thanks in advance

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They are not necessarily faster, particularly on non-TnL HW, however they are essential for taking advantage of the post-TnL vertex cache on TnL HW. The vertex cache goes to waste if you''re not using IBs.

Even using IBs, you won''t get the benefits of the vertex cache unless your indices have locality of reference. In other words, random haphazard indices will have few vertex cache hits. Indices that are (roughly) sequential are best. This is one of the optimizations performed by ID3DXMesh::Optimize/OptimizeInplace.

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