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Material with normal map/bump mapping produces damaged penumbra on mesh (Cycles).
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Description

System Information
Windows 10 with GTX 1070

Blender Version
2.78

Short description of error
Here is screenshot of the problem - blocky artifacts on areas with penumbra (Cycles render):
Screenshot
This happens both for materials with normal maps and also with bump mapping.

Exact steps for others to reproduce the error

  1. Open attached scene (s).
  2. Switch viewport shading mode to "Rendered" (CPU or GPU - not matter).


Details

Type
Bug

Event Timeline

Bastien Montagne (mont29) lowered the priority of this task from Needs Triage by Developer to Normal.Dec 2 2016, 8:40 AM
Sergey Sharybin (sergey) closed this task as Archived.Dec 2 2016, 12:43 PM
Sergey Sharybin (sergey) claimed this task.

It is indeed a terminator problem. Happens when there's too much difference between bump normal and a real geometric one -- it's possible to have ray which bounced below the surface, which causes such shading artifacts. Workaround is to apply subsurf modifier on the object.

There might be tricks to solve this without too much overhead, but currently it's not considered a bug.

Thanks for the report anyway.