Boolean not working on cylinders and cones #114649

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opened 2023-11-09 00:27:50 +01:00 by charley-fries · 3 comments

charley-fries commented

2023-11-09 00:27:50 +01:00

System Information
Operating system: chrome os (linux)
Graphics card: integrated graphics

Blender Version
Broken: 3.6.0
Worked: (newest version of Blender that worked as expected)

Short description of error
attempting to boolean cut a cone object (being an object where several faces connect back to 1 vertex) with a complicated shape causes the cone to dissapear entirely instead of just the intended area issue seems to only happen with cones
Exact steps for others to reproduce the error
create a cone
create a plane and subdivide it a few times
shrinkwrap the plane to the cone and apply it
add depth to the cone by extruding every face
attempt to do a booolean cut with the plane object
Based on the default startup or an attached .blend file (as simple as possible).

**System Information** Operating system: chrome os (linux) Graphics card: integrated graphics **Blender Version** Broken: 3.6.0 Worked: (newest version of Blender that worked as expected) **Short description of error** attempting to boolean cut a cone object (being an object where several faces connect back to 1 vertex) with a complicated shape causes the cone to dissapear entirely instead of just the intended area issue seems to only happen with cones **Exact steps for others to reproduce the error** create a cone create a plane and subdivide it a few times shrinkwrap the plane to the cone and apply it add depth to the cone by extruding every face attempt to do a booolean cut with the plane object Based on the default startup or an attached .blend file (as simple as possible).

boolean_problem.blend

1.3 MiB

charley-fries added the

labels 2023-11-09 00:27:51 +01:00

Pratik Borhade commented

2023-11-09 05:24:12 +01:00

Member

Hi, thanks for the report. I can confirm that source object disappears. However this does not happen with Fast solver.

Hi, thanks for the report. I can confirm that source object disappears. However this does not happen with `Fast` solver.

Pratik Borhade added

and removed

labels 2023-11-09 05:24:24 +01:00

sw-tya commented

2024-01-12 21:31:19 +01:00

Currently I can't prove this is the same issue as in: blender/blender-addons#104657
Where disappearing objects are also observed; there it is due to use of the preceding Join operation confusing all except the Boolean solve Exact with Self Intersection enabled.

The similarity: Using the attached boolean_problem.blend file, I also agree with @PratikPB2123, the Fast Solver stops the Cone and Cylinder from disappearing, but it causes a large hole in the object. The faces are not transferred from the other complex shape at all. Enabling solve Exact with Self Intersection does a much better job but it is not perfect with this level of complexity.

The help does point to requiring manifold objects on which to conduct Boolean operations. While these objects do pass the manifold test - here are some very shape angles (>189 degrees) and some very thin planes.

Currently I _can't_ prove this is the same issue as in: https://projects.blender.org/blender/blender-addons/issues/104657 Where disappearing objects are also observed; there it is due to use of the preceding Join operation confusing all except the Boolean solve Exact with Self Intersection enabled. The similarity: Using the attached boolean_problem.blend file, I also agree with @PratikPB2123, the Fast Solver stops the Cone and Cylinder from disappearing, but it causes a large hole in the object. The faces are not transferred from the other complex shape at all. Enabling solve Exact with Self Intersection does a much better job but it is not perfect with this level of complexity. The help does point to requiring manifold objects on which to conduct Boolean operations. While these objects do pass the manifold test - here are some very shape angles (>189 degrees) and some very thin planes.

sw-tya commented

2024-01-16 10:09:59 +01:00

I don't know the intent of the original complex shape, results can be improved by:
Running Mesh -> Clean Up -> Degenerative Dissolve a few times.
After this convert the mesh to triangles using Face -> Triangulate Faces
Also Triangulate the faces of the cone and cylinder. Not a fix but might be a workaround.

I don't know the intent of the original complex shape, results can be improved by: Running Mesh -> Clean Up -> Degenerative Dissolve a few times. After this convert the mesh to triangles using Face -> Triangulate Faces Also Triangulate the faces of the cone and cylinder. Not a fix but might be a workaround.

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Reference: blender/blender#114649

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