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Boolean modifier and objects with flush geometry
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Description

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce MX150/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.94

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: rB26bd5ebd42e3

Short description of error
The boolean modifier doesn't create proper geometry on areas where the two objects are flush.

I don't know if this can be considered a bug because, as far as I remember, it has always been present. Maybe it's a limit of the implemented algorithm, but the same scenario works in other software (like 3dsmax).

Exact steps for others to reproduce the error

  • From the default startup file, add a default cylinder
  • Move the cylinder 1 blender unit on x axis
  • Hide the cylinder
  • Select the default cube and add a boolean modifier
  • Set the cylinder in the "Object" field
  • Cycle through the operations to see different errors

Here some pictures:

Union

Difference

You can try to apply the modifier and inspect the geometry.

Let me know if I'm telling nonsense or that's legit.
If the second, I hope a solution can be found, since I work in 3D printing and I heavily rely on boolean modifiers.

Thank you in advance.
Best regards,
Andrea

Event Timeline

Hans Goudey (HooglyBoogly) changed the task status from Unknown Status to Unknown Status.Dec 5 2019, 4:35 PM
Hans Goudey (HooglyBoogly) claimed this task.

Thanks for the bug report! At this point though that is a known limitation of the current boolean algorithm. There's a new one being worked on right now (in the "newboolean" branch) that will handle these cases.

I'm guessing that will make it into 2.82 or 2.83, so in just a bit of time we should have a much better boolean modifier! In the mean time offsetting the two objects the objects just a little should 'fix' the problem.

Good news everyone! Thank you for your reply and forgive me for the not so appropriate report :D

Andrea

Good news everyone! Thank you for your reply and forgive me for the not so appropriate report :D
Andrea

There's nothing to forgive! Thanks for helping.