hi, i am currently using GL_VERTEX_PROGRAM_ARB and GL_FRAGMENT_PROGRAM_ARB to implement shadow mapping, is there any way to obtain the world coordinates of a vertex without explicitly passing the model matrix into the vertex program? coz i don’t want to build a texture transformation matrix for every object in the scene. thx!!
No, that isn’t possible. OpenGL only has a Modelview matrix and you are not able to get the “model-part” out of this matrix.
So you have to pass your own matrix to you Vertex Program.
Thank you:)
You can always store the inverse of your camera transformations once, and apply that to the modelview-transformed vertices to get world-space vertices.
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