Cycles principled BSDF artifact with transmission and IOR 1.0 (GPU) #63286
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Reference: blender/blender#63286
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System Information
Operating system: win 10 pro
Graphics card: 1070
Blender Version
Broken: 2.79b
circular banding with transmission and ior set to 1 using principle shader. (only happens in gpu rendering not cpu)
Added subscriber: @3di
Added subscriber: @nacioss
Please provide the blend file. Also i notice you are using Blender 2.79, try with Blender 2.8 beta
transmission bug.blend
file attached. Try moving the perspective whilst viewport rendering, the banding stays relative to the screen and not the perspective movement.
I'm not able to move to 2.8 during beta. It's the simplest of scenes though, just a plain with a material and a hdri background. I'd appreciate if you could confirm if this bug doesnt affect 2.8 if you have chance to try it.
Added subscriber: @brecht
I can confirm the issue in latest master. Easy to workaround by using IOR 1.001 instead.
circular banding with transmission and ior set to 1 (only happens in gpu rendering not cpu)to Cycles principled BSDF artifact with transmission and IOR 1.0 (GPU)It happens only in Multiscatter GGX though, not with GGX selected.
I don't see banding anymore (though the HDR is missing in the file, checked with another one). Likely fixed by the changes to Multiscatter GGX in 4.0.