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kingsna1

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My understanding of ray tracing is that it maps out luminance for a scene. Now with ray tracing (backwards ray tracing that starts from the camera outwards) does each ray have a luminance value associated with it? In the case of a perfectly diffuse surface, can one simply take the mean of all of the secondary rays luminance to arrive at a luminance value for the primary ray or is this assumption wrong? If L

_{0}are the primary rays luminance, and L_{1},L_{2},L_{3}, L_{4},L_{5}are the secondary rays that are created due to the diffuse surface. (see Diagram for explanation).