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Instead of hitting the scene with rays, can we add color filters on top of the intensity part of the image? Just add a red filter if there is red light in the scene or something. Is it because that would miss the different intensity of the filter?


How exactly is luminesce/light mimicked in generated photos? Is it typically a simple filter or do we have to manually calculate the new color that it would be if it were in bright light or in the shadows?


Are there setting in which the "steady state" assumption does not hold? For example, rendering images of outer space?