The difference boolean does nothing on the model

i did check:

  • face orientations is correct, all blue
  • merged by distance for all meshes
  • objects are closed, no holes.enter image description here

what im trying to do here is cut the 'magma' into this volcano.

  • $\begingroup$ added the blend file. Decimate it actually and now boolean works but i get a mesh with a hole instead of a closed mesh $\endgroup$
    – Wonkey
    Nov 30, 2020 at 5:23

1 Answer 1


The former Boolean bugs as soon as you have overlapping edges, vertices or faces, you need to use the Exact option in the new Blender version and it will work fine:

enter image description here

enter image description here


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