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question about LockVertexBuffer

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When I use the vertices drawn from an existing model, the number of vertices is not 3 times the number of faces(triangles). how should I fix them such that I can use DrawPrimitive to reconstruct the mesh? thanks.

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The geometry probably uses indexing; see DrawIndexedPrimitive and see if you can get the index buffer from the original object as well (besides the vertex buffer).

Other options are that the vertex buffer doesn't contain triangles but contains a triangle strip or fan; this reuses vertices from the previous triangle and hence requires less storage and potentially renders more efficiently.

illco

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