Myteriously appearing intersecting faces, where there can't be none #78318

New Issue

Ed Harrington · 2020-06-26T16:54:14+02:00

Ed Harrington commented

2020-06-26 16:54:14 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics 620 Intel 4.5.0 - Build 26.20.100.6913

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-12 17:01, hash: blender/blender@fd8d245e6a
Broken version: 2.83 (latest)
Worked: ?

Addon Information
Name: 3D-Print Toolbox ()
Author: Campbell Barton

Short description of error
https://blenderartists.org/t/intersecting-faces-but-there-is-no-intersection/1237360

The toolbox tells me that there would be intersecting faces, where there can't be any.
I faced this error the first time, when designing for 3D-printing. I imported a path (or created a path/curve on my own) filled and extruded it to z-direction. When checking now the toolbox it might happen that I get multiple intersecting faces.
The strange thing is, that scaling (in edit mode), moving the origin or moving the bottom or lid changes the number of identified intersections. For this reason I'm quite sure, these are false alarms.

Online.blend

Exact steps for others to reproduce the error
Import or create curve.
Extrude the curve by a profile-curve.
Convert the extruded form to a mesh.

Intersecting faces (Detailed description and example inside the blender file)

What also leads to problems:
Import curve / draw curve. Convert to mesh.
Fill the curve.
Extrude it.

Intersecting faces

I hope someone can have a look at this problem as it is really annoying. I don't have any ideas. The only thing I did to blender is, setting up the 3D-Printing environment, using metric scale and modeling in print size. Maybe there is a mathematical problem with float precision?
If I can help you any further, just contact me.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Intel(R) UHD Graphics 620 Intel 4.5.0 - Build 26.20.100.6913 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-12 17:01, hash: `blender/blender@fd8d245e6a` Broken version: 2.83 (latest) Worked: ? **Addon Information** Name: 3D-Print Toolbox () Author: Campbell Barton **Short description of error** https://blenderartists.org/t/intersecting-faces-but-there-is-no-intersection/1237360 The toolbox tells me that there would be intersecting faces, where there can't be any. I faced this error the first time, when designing for 3D-printing. I imported a path (or created a path/curve on my own) filled and extruded it to z-direction. When checking now the toolbox it might happen that I get multiple intersecting faces. The strange thing is, that scaling (in edit mode), moving the origin or moving the bottom or lid changes the number of identified intersections. For this reason I'm quite sure, these are false alarms. [Online.blend](https://archive.blender.org/developer/F8645585/Online.blend) **Exact steps for others to reproduce the error** Import or create curve. Extrude the curve by a profile-curve. Convert the extruded form to a mesh. - > Intersecting faces (Detailed description and example inside the blender file) What also leads to problems: Import curve / draw curve. Convert to mesh. Fill the curve. Extrude it. - > Intersecting faces I hope someone can have a look at this problem as it is really annoying. I don't have any ideas. The only thing I did to blender is, setting up the 3D-Printing environment, using metric scale and modeling in print size. Maybe there is a mathematical problem with float precision? If I can help you any further, just contact me.

Ed Harrington commented

2020-06-26 16:54:14 +02:00

Added subscriber: @edshead