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Material energy preservation
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For V-Ray 6 we worked on updating the model for energy preservation for shaders. Energy preservation determines how the diffuse, reflection, and refraction color affect each other. V-Ray tries to keep the total amount of light reflected off a surface to be less than or equal to the light falling on the surface as this happens in real life.
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The reflection level dims the diffuse and refraction levels, and the refraction level dims the diffuse level.
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