Overlapping geometry shows black faces on Cycles Blender 3.1 (Ray Tracing Precision) #96475
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Reference: blender/blender#96475
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.65
Blender Version
Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash:
c77597cd0e
Worked: 3.0.1
Short description of error
The new feature "Cycles RayTracing Precision"
https://wiki.blender.org/wiki/Reference/Release_Notes/3.1/Cycles#Ray_Tracing_Precision
Is producing black faces on Overlapping geometry. This not happend on Blender 3.0.1.
I think an on /off switch for the Cycles RayTracing Precision could solve the overlapping geometry problem.
Thanks!
Exact steps for others to reproduce the error
Just open the file on Blender 3.0.1 and 3.1 and you'll see the difference.
Here are some images:
cubes overlapping.blend
Here is a link to blender community for requesting an On /Off Switch to solve the overlapping geometry problem:
https://blender.community/c/rightclickselect/084V/
Added subscriber: @Emi_Martinez
#102987 was marked as duplicate of this issue
#101477 was marked as duplicate of this issue
#100154 was marked as duplicate of this issue
#99238 was marked as duplicate of this issue
#99086 was marked as duplicate of this issue
#98988 was marked as duplicate of this issue
#98465 was marked as duplicate of this issue
#97736 was marked as duplicate of this issue
#97729 was marked as duplicate of this issue
#97494 was marked as duplicate of this issue
#97399 was marked as duplicate of this issue
#96996 was marked as duplicate of this issue
#96958 was marked as duplicate of this issue
Overlapping geometry shows black faces on Blender 3.1to Overlapping geometry shows black faces on Cycles Blender 3.1Added subscribers: @leesonw, @brecht, @Alaska
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
CC @brecht or @leesonw what should be done with this report? It seems like this is a known issue and I'm not sure how easy it is to fix.
It looks like this is a known issue. As noted in the release notes:
Please use other channels for user feedback and feature requests: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests
Overlapping geometry shows black faces on Cycles Blender 3.1to Overlapping geometry shows black faces on Cycles Blender 3.1 (Ray Tracing Precision)I just thought I would add an extra comment to help the developers make a decision.
From my own testing this issue does not effect OptiX. CUDA and CPU when testing on my computer both have issues. This issue was introduced by
74afc86d4b
based on my own testing.Added subscriber: @lictex_1
Changed status from 'Needs Developer To Reproduce' to: 'Archived'
This is not considered a bug currently, it's a documented trade-off of the new method.
Are the rendering differences between CPU/CUDA and OptiX in this scenario considered a bug?
No.
I really don't know if this is the pleace to ask.
But there is a way to implement an on /off switch for this feature?
I know that blender 3.1 release was about performance, but this trade-off is huge!
Added subscribers: @rawee-4, @Bhagath-Goud, @juang3d, @dupoxy, @PratikPB2123, @mano-wii
Added subscriber: @Icedcg
Sorry, Didn't find same bug submitted before. So what about the people that don't have GPU with OptiX tech? Previously it was so convenient to not bother with overlapping geometry to render something. But now you always have to merge this meshes into a single mesh... Just consumes time for no reason honestly.
Completely agree.
Here is a link to blender community for requesting an On /Off Switch to solve the overlapping geometry problem:
https://blender.community/c/rightclickselect/084V/
Added subscriber: @zhanghua
Added subscriber: @Vyach
Added subscriber: @Rincewind3D-1
Added subscriber: @APEC
Not acceptable "trade-off", for architectural modeling...
Not acceptable at all, in any modelling work. There should be a way to swith this off..
Added subscriber: @Damian-Trebilco
Added subscriber: @Brett-Witty
I found this behaviour continued independent of choosing CPU, CUDA or Optix rendering in Cycles.
If it's documented behaviour, it doesn't appear to come with tools to identify or deal with the "trade off". I had components that rendered fine individually, but exhibited the bug only in a geometry nodes combined object.
Added subscribers: @bribi, @iss
I noticed that this problem can be somewhat alleviated if the mesh is made out of geometry nodes. Realize Instances seems to fix the geometry for the renderer to not exhibit this behaviour.
Short test. Not true. Please attach example.
My apologies, issue #99238 was merged with this one. The geometry isn't as obviously overlapping as your example, (and seems to be mostly just intersecting) but seems to manifest in the same problem. In that issue, Realize Instances did fix it. In your example, the realized instances will be definitely overlapping, but in #99238 it was not the case.
These might be unrelated issues, but I didn't merge the issues.
@Brett-Witty my guess that vertices have little shift (due to float error) after realizing. So z-fighting appears less.
Any solution or workaround on this problem?
I cant switch to blender 3+ because of this...
only to not make z-fighting polys.
Displace modifier or shrinkwrap-offset will help to fix,
not possible in architecture modeling with hundreds small elements (objects) or even in one single mesh to do that...
Now you just do not have ability to use cheat.
Try to randomize positions a little, then…
Example b3.3:
untitled.blend
Added subscribers: @Piergiorgio_PG, @mod_moder
Added subscriber: @kalugra23
One question, using Blender 3.0.1 can cause some issue for the redesign and new features of Geometry Nodes from Blender 4.1?