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int opaque_for_gi;
Use a value of 1 to make the hair material opaque for GI calculations. Default Default value is 0. See VRayHairMtl for more information.
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int use_cached_gi;
If set to 1, an irradiance map will be used to approximate diffuse indirect illumination. Otherwise the hair closure will always be calculated with brute force GI. Default value is 1. See VRayHairMtl for more information.
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