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littlekid

Vertex Shader with Mesh

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If i want to use vertex shader, do i have to extract out the vertices and indices of the mesh then set the shader and render using DrawIndexedPrimitive, or can i set the shader and call DrawSubset?

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The latter. The shader will automaticlly pick up anything rendered between BeginPass() and EndPass.

Illco

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calling DrawSubset on D3DXMesh will just set the index and vertex buffer and call DrawPrimitive for you. any other device/render states you've set or D3DXEffect has set for you will be applied to what you're drawing.

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