MaterialX: metal edge tint should not be multiplied by specular_weight #240
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Fixes a bug in the MtlX graph. The edge-tint color for the
generalized_schlick_bsdfshould not be multiplied byspecular_weight, as the whole lobe is multiplied byspecular_weightas well.(Note that MtlX still does the wrong thing if
specular_weight> 1, but that's not fixable on the OpenPBR side, unless we just clamp the weight sospecular_weight> 1 does nothing to the metal).