Principled BSDF material turns black in the viewport when Clearcoat is set to 1 and the Clearcoat Roughness is set to 0 #53217
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Reference: blender/blender#53217
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System Information
Windows 7 SP1 (Fully Up-to-Date) with NVIDIA GTX 980 (Driver version: 387.92)
Blender Version
Broken: 2.79
5bd8ac9Short description of error
When using the Principled BSDF and setting the Clearcoat to 1 and the Clearcoat Roughness to 0, the material turns black in the viewport (material shaded view).
clearcoatroughness.blend
Exact steps for others to reproduce the error
Add a Principled BSDF shader to any object, switch to the material shaded view in the viewport and set the Clearcoat to 1.0 and the Clearcoat Roughness to 0. It should turn black.
Please check the attached file.
Changed status to: 'Open'
Added subscriber: @charbel
Added subscribers: @brecht, @Sergey
@brecht, think it's matter of clipping roughness. But not fully familiar with code to check how to make it match behavior of Cycles kernel. Mind having a look? :)
This issue was referenced by
07dbff7dc1Fixed with a simple clamp. This code will be completely replaced in Blender 2.8 anyway.
Changed status from 'Open' to: 'Resolved'