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Boolean Modifier Union Operation creates inside topology --> creates sculpting issues
Open, Needs Triage by DeveloperPublic

Description

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.71

Blender Version
Broken: version: 2.81 (sub 8), branch: master, commit date: 2019-09-07 20:51, hash: rB4764362ebb91
Worked: (optional)

Short description of error
When using a boolean modifier to unite two objects, sometimes geometry is created inside the mesh. This states a Problem as this makes it impossible to smooth out the connection between the combined Object. (It gets even worse)
Moving the objects around in a trial & error fashion can solve this issue, however that requires a lot of time and is far from optimal.
I often use the boolean modifier to join the palm of a hand with the indiviual fingers. That is also the case for the attached file, where we can see that out of five fingers only the middle finger is combined optimal.
I tried "Select" -->"Select all by trait"--> "Interior Faces" to clean up the inside topology, but it did not recognize any of it.
I have experienced the issue in several Versions of Blender: 2.78, 2.79 and now 2.8, but did not know about the report feature until the official youtube channels about bug reporting.

Exact steps for others to reproduce the error

  1. Open attached file
  2. Select Palm
  3. Go into local view
  4. (optional, just for reviewing) look inside the mesh

  1. apply modifiers
  2. try sculpting

Thank you very much for your hard work.

Details

Type
Bug

Event Timeline

your objects are too small and far away from the center, thats the issue