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3D How to increase the triangle count / tessellate a lo-res ID3DXMesh?

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If the model comes out as a low-res mesh (.X file), because I want to do something like convex decompositions, voroni kind of thing... I want to increase the triangle count / division of the mesh... If I create a new mesh out of the old mesh, you have to manually fill in the vertex positions, normals and uvs etc, is there an handy way (an api) to increase the count, I don't know tessellate is the correct term since it only applies to patch meshes.

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