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There is a known precision bug in the current HIP compiler version (RDNA2 family/Windows) that has already been fixed and will be available in a future HIP SDK release. Enabling more precise math prevents the artifacts. This may cause a 5-10% performance drop in some scenes. Fix #136138: Microfacet BSDF Fix #136449: Hair BSDF Pull Request: https://projects.blender.org/blender/blender/pulls/136341