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A constructor node for the surfaceshader type. Describes light scattering and emission for closed 'thick' objects. If the BSDF is opaque only the front side will reflect light and back sides will be black if visible. If the BSDF is transmissive the surface will act as an interface to a solid volume made from this material.
Bidirectional distribution function for surface scattering.
Distribution function for surface emission. If unconnected, then no emission will occur.
Surface cutout opacity.