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Boolean Modifiers Don't Work Properly
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Certain options for the boolean modifier doesn't work how it should. The union option worked once for some reason but never again. The other options will do weird things. 99% of the time I get a messed up result or nothing happens at all when using the boolean modifier.

Use the boolean modifier on meshes. You can try and union two meshes etc.



Event Timeline

I can not reproduce this issue. If I take two cubes all boolean mode seem to work fine between them.

It works fine for me. Consider providing a blend file with an example of this. Also, check that the Overlap threshold in the Boolean modifier is set to 0.0 exactly, since merging vertices can give problems

Campbell Barton (campbellbarton) triaged this task as Needs Information from User priority.Dec 6 2018, 6:59 AM

It doesn't always happen, but in this case, the union option wouldn't work.

Sadly, that's a known limitation, sorry. Parallel faces with 0 distance on the same space don't work, and some volume needs to overla. Here is an exagerated example, but you can separate faces and overlap the volumes just a very very little ammount like this and it would still work. I heard Howard Trickey might work on improving booleans in the future :)

Guess this can be merged into T47108 [which is alo mentioned in T47030]