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Shadow mapping basic question

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Im about to implement Shadow mapping. A small question however. Which is the best way of knowing, in my shaders, which texture coordinate in the shadow map that a light-source to point vector represents? I have already rendered the scene from the lights point of view, and stored the depth-values in a texture. But how do I look up which texture coordinate to use (to compare the depth values). Could I just multiply the vertex by the projection-matrix of the light-source and then convert it to clip-coordinates and use those for look-up? How do I do that?

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