Regression: Blending materials ( color attributes ) glitchy #97916
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Reference: blender/blender#97916
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System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15
Blender Version
Broken: version: 3.2.0 Beta, branch: master, commit date: 2022-05-05 20:01, hash:
1b566b70c1Worked: 3.1.2
Caused by
80859a6cb2Short description of error
when blending two materials with color attributes, glitchy lines apear on the surface.
Exact steps for others to reproduce the error
beta_bug.blend
Open the included Blend file and switch to material preview in cycles mode. You will see lines appearing in the brick texture. Opening the same scene in Blender 3.1 works fine.
3.1.2
3.2 beta
Added subscriber: @RobTuytel
#98648 was marked as duplicate of this issue
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Can confirm, will check
Added subscriber: @OmarEmaraDev
Changed status from 'Confirmed' to: 'Needs User Info'
Can you try to simplify the file as much as possible and only include the object with the brick texture? The attached file is too big to investigate easily.
Changed status from 'Needs User Info' to: 'Confirmed'
@lichtwerk Sorry.
using 1K textures now{F13064663}
Added subscriber: @fclem
Caused by
80859a6cb2@fclem: mind checking?
Blending materials ( color attributes ) glitchyto Regression: Blending materials ( color attributes ) glitchyChanged status from 'Confirmed' to: 'Resolved'
This is expected behavior. If you switch to cycles and render using bump only displacement it does exactly the same thing. The new displacement is more in line with what cycles does. This mean the old behavior was the wrong one.
I have added a note about this in the release notes https://wiki.blender.org/wiki/Reference/Release_Notes/3.2/EEVEE.
This problem happens in cycles material preview, not using Eevee. When rendering it looks fine, but the material preview mode is distored by verticle lines. If this is expected new behavior it makes material editing pretty hard.
Cycles material preview is using EEVEE internally. So everything I've written still stands true.
Added subscriber: @Grady
@fclem Is there any way the 3.1.2 behavior could be an option as well, for both Eevee and Cycles? While I understand why someone might want box projection for mapping textures onto already displaced geometry, it's also the case that often someone might want to displace geometry and apply textures to it using the same coordinates for both too, without having to UV unwrap it. The screenshot in the original bug report of the brickwork example is a good example use case for this. And as far as I'm aware of, there's currently no way of achieving this right now in Eevee or Cycles, without having to manually UV unwrap a mesh. Which is an approach that's incompatible with generated geometry.
Added subscriber: @gaonirico