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Mesh->DrawSubset

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In the ID3DXBaseMesh object, there is a method that you use to draw a polygon of a mesh, DrawSubset(PolygonNumber), as most of you know. My question is, how would you get the coordinates of the points of the subset that you are drawing ? This is essential for collision detection and Y correction since nobody on the face of the earth has any info on using D3DXIntersect (which I can''t get to work).

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