Boolean modifier union/difference are inverted based on cutout mesh generation method #75080

New Issue

Sid Naik · 2020-03-25T19:13:22+01:00

Sid Naik commented

2020-03-25 19:13:22 +01:00

Operating system: Windows 10 Home
Graphics card: GTX 1060

Broken: 2.82

Boolean Union is treated as Difference and vice versa when a mesh is generated with mirror modifier.

Steps to reproduce:

Get any mesh, use a cube to carve a piece of geometry out using Boolean modifer set to 'Operation' to Difference.
Add a mirror modifier to the cube and mirror it over X axis. (handedness change?)

Result: You will see that the mirrored portion of the mesh does not boolean properly.

More Evidence:
4. Apply mirror modifier, separate the meshes.
5. Try to boolean the new cube into your mesh. You will see that you cannot use Difference as a cutout now, you have to use Union.

StairIssue.blend

Operating system: Windows 10 Home Graphics card: GTX 1060 Broken: 2.82 Boolean Union is treated as Difference and vice versa when a mesh is generated with mirror modifier. Steps to reproduce: 1. Get any mesh, use a cube to carve a piece of geometry out using Boolean modifer set to 'Operation' to Difference. 2. Add a mirror modifier to the cube and mirror it over X axis. (handedness change?) Result: You will see that the mirrored portion of the mesh does not boolean properly. More Evidence: 4. Apply mirror modifier, separate the meshes. 5. Try to boolean the new cube into your mesh. You will see that you cannot use Difference as a cutout now, you have to use Union. ![Annotation 2020-03-26 103557.png](https://archive.blender.org/developer/F8428826/Annotation_2020-03-26_103557.png) [StairIssue.blend](https://archive.blender.org/developer/F8428823/StairIssue.blend)

Sid Naik commented

2020-03-25 19:13:23 +01:00

Added subscriber: @sidwasnothere

Germano Cavalcante commented

2020-03-26 14:45:16 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-03-26 14:45:16 +01:00

I don't understand the bug.
The attached file doesn't even have the mirror modifier.

It would be nice if you could simplify the file or be more specific about what the bug is.

I don't understand the bug. The attached file doesn't even have the mirror modifier. It would be nice if you could simplify the file or be more specific about what the bug is.

Sid Naik commented

2020-03-26 15:43:49 +01:00

Thanks for feedback, edited description to read more easily, updated image and .blend in the same way.

Ankit Meel commented

2020-03-28 15:42:51 +01:00

Added subscriber: @ankitm

Ankit Meel commented

2020-03-28 15:42:51 +01:00

The report seems correct. But don't know if it is a bug or a limitation (& thus feature request )

Hans Goudey commented

2020-04-24 23:18:47 +02:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2020-04-24 23:18:47 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Hans Goudey commented

2020-04-24 23:18:47 +02:00

Thanks for the report, I can't reproduce this though. Could you specify a version where this worked in your case?

Either way, we'd have to see if you could still reproduce the problem in 2.82. And we'd have to find that it's not a problem with Boolean, which is being rewritten from scratch.

![image.png](https://archive.blender.org/developer/F8493211/image.png) Thanks for the report, I can't reproduce this though. Could you specify a version where this worked in your case? Either way, we'd have to see if you could still reproduce the problem in 2.82. And we'd have to find that it's not a problem with Boolean, which is being rewritten from scratch.

Ankit Meel commented

2020-05-02 18:15:07 +02:00

I can't reproduce this though.

In the file, there needs to be another cutout, as per OP, mirror opposite to the original cubes, which is not there.

> I can't reproduce this though. In the file, there needs to be another cutout, as per OP, mirror opposite to the original cubes, which is not there.

Campbell Barton commented

2020-05-13 04:13:01 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2020-05-13 04:13:01 +02:00

Changed status from 'Needs User Info' to: 'Archived'

Campbell Barton closed this issue

2020-05-13 04:13:01 +02:00

Campbell Barton self-assigned this 2020-05-13 04:13:01 +02:00

Campbell Barton commented

2020-05-13 04:13:01 +02:00

More than a week without reply or activity.
Due to the policy of the tracker closing for until required info/data are provided.

If the problem persists please open a new report with the required information.

More than a week without reply or activity. Due to the policy of the tracker closing for until required info/data are provided. If the problem persists please open a new report with the required information.

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Boolean modifier union/difference are inverted based on cutout mesh generation method #75080