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Maniphest T86805

Inconsistent Boolean Behavior (2.93 regression?)
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Description

System Information:
Operating system: Linux-5.10.0-4-amd64-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.56

Blender Version:
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-21 00:24, hash: rBb4e96550ce59
Worked: 2.92 release from preliminary testing

Short description of error:
In my scene I have an object that makes use of various Boolean modifiers. Roughly 50% of the time the Boolean modifiers are re-calculated (by re-opening the file or changing the boolean modifier visibility), the modifiers will produce the wrong result. Here's images showing the issue:

CorrectIncorrect

Exact steps for others to reproduce the error:
I'm not exactly sure how to reproduce it, so I've included a .blend file that has an issue.
To reproduce the issue with the .blend file, either:

  1. Reload the file over and over again and observe the different results.
  2. Toggle the visibility of one of the boolean modifiers in the .blend file on and off over and over and observe the different results.

If you would like to investigate the objects used for the boolean modifiers, then exit local mode by pressing / on the keyboard.

T86805 - Boolean Inconsistency.blend939 KBDownload

Here's a video demonstrating the issue:

Revisions and Commits

rB Blender
rB2d5a715f440a Fix T86805 Inconsistent results for exact boolean.

Related Objects

Event Timeline

Alaska (Alaska) created this task.Mar 22 2021, 12:04 AM
Alaska (Alaska) updated the task description. (Show Details)
Alaska (Alaska) renamed this task from Inconsistent Boolean Behavior to Inconsistent Boolean Behavior (2.93 regression?).Mar 22 2021, 12:14 AM
Falk David (filedescriptor) changed the task status from Needs Triage to Confirmed.Mar 22 2021, 1:37 PM
Falk David (filedescriptor) added projects: Modifiers, Modeling.
Falk David (filedescriptor) added a subscriber: Falk David (filedescriptor).

I can confirm this issue on the latest 2.93.0 Alpha, branch: master, commit date: 2021-03-22 11:23, hash: rBc4c195672ddd. The evaluated mesh seems to be randomly switching between the two results.

Wovchik (microcoder) added a subscriber: Wovchik (microcoder).Mar 23 2021, 5:54 AM
Henrik Dick (weasel) added subscribers: Howard Trickey (howardt), Henrik Dick (weasel).Apr 16 2021, 10:15 PM

I have done some ablation tests and reduced the file down to two booleans. You can see the result switch not only when reevaluating the modifier, but also when moving some of the vertices of the tube in that file.

T86805 - Boolean Inconsistency.blend961 KBDownload

@Howard Trickey (howardt) Any idea what could cause this?

Howard Trickey (howardt) added a comment.Apr 16 2021, 11:01 PM

Hmm, I tried this with the latest build and could not get it to do this. I did this on my Mac. What platform are you using (I'm hoping this isn't platform specific, but grasping at straws here).

Henrik Dick (weasel) added a comment.EditedApr 17 2021, 10:46 AM

Tested and confirmed with

System Information
Operating system: Linux-5.8.0-2-amd64-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.66

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-04-16 17:44, hash: rBe524a6ecf7cc

Can not reproduce with:

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 780/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-04-16 17:44, hash: rBe524a6ecf7cc

So this one seems to be Linux specific.

Howard Trickey (howardt) added a comment.Apr 17 2021, 4:38 PM

OK, I can get it to happen on Linux, about once out of every 4 times.

Howard Trickey (howardt) closed this task as Resolved by committing rB2d5a715f440a: Fix T86805 Inconsistent results for exact boolean..Apr 17 2021, 8:22 PM
Howard Trickey (howardt) claimed this task.
Howard Trickey (howardt) added a commit: rB2d5a715f440a: Fix T86805 Inconsistent results for exact boolean..
Howard Trickey (howardt) mentioned this in rBb8115f0c5bd9: Fix performance regression in Exact boolean due to exact triangulation..Jul 5 2021, 4:06 PM