* Return roughness and IOR for BSDF sampling * Add functions to query IOR and label for given BSDF * Default IOR to 1.0 instead of 0.0 for BSDFs that don't use it * Ensure pdf >= 0.0 in case of numerical precision issues Ref T92571, D15286
* Return roughness and IOR for BSDF sampling * Add functions to query IOR and label for given BSDF * Default IOR to 1.0 instead of 0.0 for BSDFs that don't use it * Ensure pdf >= 0.0 in case of numerical precision issues Ref T92571, D15286