Geometry nodes boolean intersect sometimes not working #87078

New Issue

Nicolas Lelong · 2021-03-31T10:56:37+02:00

Nicolas Lelong commented

2021-03-31 10:56:37 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Quadro RTX 3000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.69

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-29 22:00, hash: 91c44fe885
Worked: ?

Short description of error
Boolean intersect applied using geometry nodes sometimes gives wrong result, depending on the instanced objects positions.
When not working, it lets appear the volume used to insect the generated geometry.

Exact steps for others to reproduce the error

Open the attached geomnode-boolean-intersection-bug.blend file
The viewport should show a correct result : scattered Suzann models, cut by a volume
In the Geometry Nodes Editor
- Change the seed value in Point Distribute from 24 to 25 (for example)
- The viewport shows the volume used for the boolean intersect node

A screen capture (animated GIF) :

geomnode-boolean-intersection-bug.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Quadro RTX 3000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.69 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-29 22:00, hash: `91c44fe885` Worked: ? **Short description of error** Boolean intersect applied using geometry nodes sometimes gives wrong result, depending on the instanced objects positions. When not working, it lets appear the volume used to insect the generated geometry. **Exact steps for others to reproduce the error** 1. Open the attached geomnode-boolean-intersection-bug.blend file 2. The viewport should show a correct result : scattered Suzann models, cut by a volume 3. In the Geometry Nodes Editor * Change the *seed* value in *Point Distribute* from 24 to 25 (for example) * The viewport shows the volume used for the boolean intersect node A screen capture (animated GIF) : ![geomnode-boolean-intersection-bug.gif](https://archive.blender.org/developer/F9915567/geomnode-boolean-intersection-bug.gif) [geomnode-boolean-intersection-bug.blend](https://archive.blender.org/developer/F9915566/geomnode-boolean-intersection-bug.blend)

Nicolas Lelong commented

2021-03-31 10:56:38 +02:00

Added subscriber: @rotoglup

Nicolas Lelong commented

2021-03-31 11:15:02 +02:00

PS. I took care to apply to Boolean node to each invidual scattered geometry, as it is manifold and non-intersecting, not to the joined global geometry.

Dalai Felinto commented

2021-03-31 12:01:03 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Dalai Felinto commented

2021-03-31 12:04:31 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2021-03-31 12:04:31 +02:00

I tried applying the mesh (tip: it needs a node like boolean to convert it to mesh) and to use the boolean modifier outside and it works. So the issue seems to be related to geometry nodes.

Leon Schittek commented

2021-03-31 13:45:58 +02:00

Added subscriber: @lone_noel

Leon Schittek commented

2021-03-31 13:45:58 +02:00

Even after applying the mesh, the boolean modifier still fails for me (Though it does indeed look a bit different from the result on the node tree and depends on which object has the modifier):

Modifier on Suzanne heads	Modifier on Cutter

In case of the modifier, this just seems like the known issue with the exact boolean algorithm relying on the mesh being manifold (which Suzanne isn't).
Ticking the new "Hole Tolerant" option in the modifier (6f63417b50) fixes it in both cases for the applied mesh.

I also wasn't able to reproduce this problem with Geometry Nodes when using a manifold mesh (e.g. Ico Sphere) for instancing instead of Suzanne. So i assume that this is what's going on here, as well.

Even after applying the mesh, the boolean modifier still fails for me (Though it does indeed look a bit different from the result on the node tree and depends on which object has the modifier): |Modifier on Suzanne heads|Modifier on Cutter| | -- | -- | |![Boolean-modifier-failing-suzanne.png](https://archive.blender.org/developer/F9915649/Boolean-modifier-failing-suzanne.png)|![Boolean-modifier-failing-cutter.png](https://archive.blender.org/developer/F9915651/Boolean-modifier-failing-cutter.png)| In case of the modifier, this just seems like the known issue with the exact boolean algorithm relying on the mesh being manifold (which Suzanne isn't). Ticking the new "Hole Tolerant" option in the modifier (6f63417b50) fixes it in both cases for the applied mesh. I also wasn't able to reproduce this problem with Geometry Nodes when using a manifold mesh (e.g. Ico Sphere) for instancing instead of Suzanne. So i assume that this is what's going on here, as well.

Nicolas Lelong commented

2021-03-31 13:55:24 +02:00

mesh being manifold (which Suzanne isn't).

Oh I thought it was, sorry for that.

Is there a manifold checker available in Blender ?

> mesh being manifold (which Suzanne isn't). Oh I thought it was, sorry for that. Is there a manifold checker available in Blender ?

Hans Goudey self-assigned this 2021-03-31 16:05:28 +02:00

Nicolas Lelong commented

2021-04-01 09:28:51 +02:00

mesh being manifold (which Suzanne isn't).

FWIW, I've just tested after quickly fixing the suzanne model to make it manifold (by removing eyeballs and filling the remaining boundary loops) :

the Intersect boolean operation seems to work fine
the evaluation time is noticeably longer (was about 1 sec, now 5-6 sec)

> mesh being manifold (which Suzanne isn't). FWIW, I've just tested after quickly fixing the suzanne model to make it manifold (by removing eyeballs and filling the remaining boundary loops) : - the Intersect boolean operation seems to work fine - the evaluation time is noticeably longer (was about 1 sec, now 5-6 sec)

Dalai Felinto commented

2021-04-01 10:21:56 +02:00

@rotoglup can you share the .blend?

Nicolas Lelong commented

2021-04-01 14:09:18 +02:00

@dfelinto Of course, here it is :

geomnode-boolean-intersection-bug (manifold suzanne).blend

@dfelinto Of course, here it is : [geomnode-boolean-intersection-bug (manifold suzanne).blend](https://archive.blender.org/developer/F9916869/geomnode-boolean-intersection-bug__manifold_suzanne_.blend)

blender-admin commented

2021-04-01 22:00:47 +02:00

This issue was referenced by e8573a59f6

This issue was referenced by e8573a59f66281f1d590e3c8b1888cfc7935b1cf

Hans Goudey commented

2021-04-01 22:01:19 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Hans Goudey closed this issue

2021-04-01 22:01:19 +02:00

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Geometry nodes boolean intersect sometimes not working #87078