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Solve issue with importance sampling at Principle shader clearcoat calculation
Open, Confirmed, MediumPublic


The clearcoat component of the Principled BSDF is currently using GTR1 for the D term while using GGX for importance sampling. This causes the clearcoat highlight to be non-consistent for increasing clearcoat roughness values.

With this patch, a switch from GTR1 to GGX is performed. This may produce some difference to the original Disney "principled" BRDF, but this should be negligibly small.



Event Timeline

Pascal Schön (VanCantus) triaged this task as Confirmed, Medium priority.Oct 20 2017, 11:15 AM