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Messy Shading of Multiple-Faced Flat Surfaces in Workbench Matcap Rendered View
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Description

System Information
Operating system: Windows 10 64-bit
Graphics card: Nvidia GTX 970

Blender Version
Broken: 2.80, b0dee09a6d55, blender2.7, 2019-01-19 20:58

Short description of error
Workbench Matcap Rendered View generates strange shading artifacts when rendering a flat mesh with flat faces that have identical normals. This happens even after recalculating normals, and happens with both flat shading and smooth shading selected. Example Blend File and screenshots included.

Exact steps for others to reproduce the error
Steps from Default Startup:

  1. Delete default cube
  2. Add Mesh -> Circle
  3. Change Circle Vertices from 32 to 8
  4. Change to Edit Mode
  5. Select all vertices and create a face by pressing F
  6. Select ring vertices
  7. Extrude and Scale along global X and Y axes, either outward or inward, and press enter
  8. Change Render Engine to Workbench
  9. Lighting -> MatCap
  10. Enter Rendered View in the Viewport

Details

Type
Bug

Event Timeline

Tarun Nalluri (cpltarun) triaged this task as Confirmed, Low priority.Jan 21 2019, 5:13 AM

Sincerest apologies for my ignorance. I did not realize that by extruding a face and scaling outwards, I was creating an extra face that covers the diameter of the entire mesh. By deleting that extra face, the shading error disappears.

Brecht Van Lommel (brecht) claimed this task.

Artifacts from overlapping faces are not currently considered a bug.