Regression: Mesh boolean node with difference not working like it did in Blender 3.5 #112009
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Reference: blender/blender#112009
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System Information
Operating system: Linux-5.15.0-83-generic-x86_64-with-glibc2.31 64 Bits, X11 UI
Graphics card: Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 21.2.6
Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-27 18:51, hash:
8a735d0aa4c7Worked: (newest version of Blender that worked as expected Blender 3.5)
Seems to be caused by
300c673a64Short description of error
Mesh boolean difference not working like it did in Blender 3.5
Exact steps for others to reproduce the error
Mesh boolean difference not working like it did in Blender 3.5 also has this issue in 3.62 and 4.0
Open Blender File in 3.5 seems to be working correctly.
Open Blender File in 3.6.2 seems to not to be working correctly.
Open Blender File in 4.0 seems to not to be working correctly.
I created / attached a blender file to show this
Can confirm.
Not quite similar but #107969 is also a scenario for ineffective boolean.
@Rytelier
If you found another bug that might be related you should create a separate bug report and just include a link to it here like @ChengduLittleA YimingWu did, don't add your issue (and files) to another bug report, it will just confuse things. Note they may work on the first issue and just skip your issue.
Before checking in depth, will raise prio here since this seems to be a relatively recent regression
Hm, seems to be caused by
300c673a64@HooglyBoogly : mind checking?
Mesh boolean node with difference not working like it did in Blender 3.5to Regression: Mesh boolean node with difference not working like it did in Blender 3.5Pretty sure this is actually caused by
fc06a471f1.Unfortunately this is a predicted change in behavior from that commit, the node no longer supports instances by viewing them as separate meshes. We don't have a good solution for this use case yet, in the end we will probably need lists. The repeat zone might work here though.
Since it's expected behavior in 4.0, I'll close this report. Thanks for bringing it up though.
Not sure what could be wrong, but opening that file in a build much before
fc06a471f1already has the changed behavior.@HooglyBoogly : are you sure it is caused by
fc06a471f1?Hmm, it adds up conceptually but I can't explain your observation so I'll reopen this report.
@HooglyBoogly @lichtwerk The original bug had nothing to do with instancing another user @Rytelier decided to try and hijack this BUG report and post another issue and add their files to it. Can you please tell them to delete their post here and open up another bug report, it just confuses things.
Is there anything I can do to further help?
It needs to be bisected, i am sure that this was a corrected incorrect behavior and not a bug.
I'm confused it worked in Blender 3.5 but doesn't work in Blender 3.62 and Blender 4.0 the phrase @mod_moder " corrected incorrect behavior and not a bug." is very confusing when it worked in Blender 3.5. How does one get this to work in Blender 3.62, Blender 4.0 like it did in Blender 3.5?
To me the node tree is a bit too complicated for it to be easy to tell which behavior is "correct". I'd have to spend more time looking it over to be sure.
The difference seems to be cause by a bug in an older Blender version related to normals. To see that do the following:
Extrude Meshnode in theBottom Extrudeframe.Flip Facesbefore that. This should invert the extrude direction. It does so now, but did not in Blender 3.5. It does work for some reason when removing the second link coming out of the Grid node.To fix your setup, you just have to remove the
Flip Facesnode in theBottom Extrudeframe. The bug was in an older version, so there is nothing to fix here for us now.Thanks!!!
Iliya Katushenock referenced this issue2023-10-24 16:02:13 +02:00