Propose zero-weight BSDF layer semantics.#2971
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tdavidovicNV wants to merge 4 commits into
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I found a difference between GLSL and OSL implementation when the layer's top is multiplied by 0. That part of MaterialX is not well defined, so I would like to propose clarification of the intent (going with the OSL's null closure as the ground truth, as it feels more intuitive than what GLSL's doing at the moment)