boolean modifier: union and difference are confused #51234

New Issue

Ian Bruce · 2017-04-16T22:17:19+02:00

Ian Bruce commented

2017-04-16 22:17:19 +02:00

System Information

Linux 4.6.0-1-amd64 / Radeon R9-280

Blender Version

2.78.a (Debian package)

Short description of error

Using the boolean modifier with "Carve" solver ("BMesh" doesn't seem to work at all),
the values of "union" and "difference" seem to be interchanged. If you want one,
you have to select the other.

Exact steps for others to reproduce the error

Create two intersecting objects.
Select one; turn off viewport visibility for the other.
Add boolean modifier for first object, with "Carve" solver, referencing other invisible object.

Now try boolean operations "union" and "difference";
it will be apparent that their values are confused.

I'm not sure about "intersect".

Unfortunately, the attached file does not succeed in reproducing the problem.
But it happened several times; it must somehow be path dependent.

However, if you change the boolean solver on the cylinder to "BMesh",
you will see what I mean about it not working, except for "union".
boolean.blend

**System Information** Linux 4.6.0-1-amd64 / Radeon R9-280 **Blender Version** 2.78.a (Debian package) **Short description of error** Using the boolean modifier with "Carve" solver ("BMesh" doesn't seem to work at all), the values of "union" and "difference" seem to be interchanged. If you want one, you have to select the other. **Exact steps for others to reproduce the error** Create two intersecting objects. Select one; turn off viewport visibility for the other. Add boolean modifier for first object, with "Carve" solver, referencing other invisible object. Now try boolean operations "union" and "difference"; it will be apparent that their values are confused. I'm not sure about "intersect". ********* Unfortunately, the attached file does not succeed in reproducing the problem. But it happened several times; it must somehow be path dependent. However, if you change the boolean solver on the cylinder to "BMesh", you will see what I mean about it not working, except for "union". [boolean.blend](https://archive.blender.org/developer/F547272/boolean.blend)

Ian Bruce commented

2017-04-16 22:17:19 +02:00

Changed status to: 'Open'

Ian Bruce commented

2017-04-16 22:17:19 +02:00

Added subscriber: @ian_bruce

Aaron Carlisle commented

2017-04-16 22:20:59 +02:00

Added subscriber: @Blendify

Aaron Carlisle commented

2017-04-16 22:20:59 +02:00

Possible this is the same as #51074? @ian_bruce can you confirm that your issue is the same described in that task?

Ian Bruce commented

2017-04-16 22:55:07 +02:00

can you confirm that your issue is the same described in #51074?

quoting from there:

a Union was made instead of a Difference. If selecting Union it makes a Difference instead.

That is exactly what I observed, although I think I was using the "Carve" solver.

I just tried the test program from that bug, and it does exactly what he says, on my system,
although my test case does not.

when doing a Difference by selecting Union, faces to "cover the holes" are not created like they're supposed to be

I saw that as well, originally, and also with his test case. The result is a non-manifold;
you can see inside the object, because faces have not been added to patch the hole.

also with his test case, the "Carve" solver is confused:

intersect --> difference
difference --> intersect
union --> cube - bishop

I recommend turning off viewport visibility for "Cube", so you can see what's going on.

That test case is absolutely gold; forget about the one I supplied.
That one demonstrates everything.

> can you confirm that your issue is the same described in #51074? quoting from there: > a Union was made instead of a Difference. If selecting Union it makes a Difference instead. That is exactly what I observed, although I think I was using the "Carve" solver. I just tried the test program from that bug, and it does exactly what he says, on my system, although my test case does not. > when doing a Difference by selecting Union, faces to "cover the holes" are not created like they're supposed to be I saw that as well, originally, and also with his test case. The result is a non-manifold; you can see inside the object, because faces have not been added to patch the hole. also with his test case, the "Carve" solver is confused: intersect --> difference difference --> intersect union --> cube - bishop I recommend turning off viewport visibility for "Cube", so you can see what's going on. That test case is absolutely gold; forget about the one I supplied. That one demonstrates everything.

Aaron Carlisle commented

2017-04-16 23:16:40 +02:00

Closed as duplicate of #51074

Aaron Carlisle closed this issue

2017-04-16 23:16:40 +02:00

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boolean modifier: union and difference are confused #51234