Regression: Ambient Occlusion causes shading artifacts #89575
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Reference: blender/blender#89575
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 462.31
Blender Version
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash:
1b8d33b18cWorked: 2.91, 2.92
Short description of error
Under lookdev mode, when object has "alpha blend" turned on in the shader, "ambient occlusion" with "bent normal" option enabled will cause shading artifact that looks like the object is shading flat.
Exact steps for others to reproduce the error
Switch the scene to lookdev mode.
Create a UV sphere
Shade it smooth
Turn on Ambient Occlusion and make sure "Bent Normals" is checked.
Assign a material to the sphere.
Under the material settings turn on "Alpha Blend".
Now the object will look like it's shaded flat/without smoothing.
Eevee_bug_scene.blend
Added subscriber: @blenderculture
#96358 was marked as duplicate of this issue
#95900 was marked as duplicate of this issue
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @PratikPB2123
Added subscriber: @EAW
It also occurs with Screen Space Refraction and Ambient Occlusion, if transmission isn't set to 1.0
Added subscriber: @AgentE24
I noticed this bug myself and I can confirm that it happened to me too.
Added subscriber: @Peter-Sampson
Added subscriber: @vignette
Eevee bug - "alpha blend" and "ambient occlusion" together causes shading artifacts under lookdev modeto Regression: Ambient Occlusion causes shading artifacts