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world coords to screen coords in directx

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Hi, I am wanting to get the screen coordinates of the bones of a skinned mesh (tiny.x :)) and convert them to screen coordinates. I have googled it but havent found anything for directx. I have managed to get the global coords of the bones origin by multiplying its matrix by the world view and proj matrices and taking the x,y,z coords. Do i then multiply that matrix by the projection matrix? If so, how do i get the screen coords from the result? Thanks in advance, Nazdreg

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