Render a material under uniform unit illumination with no absorption. A conserving, non-absorbing BSDF disappears against the background; anything visible is energy the model is losing or inventing.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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validatesis a test for Energy Conservationa lossless material must vanish into a uniform background