Mesh bisect can make face disappear #87863

Closed
opened 2021-04-27 17:13:34 +02:00 by Nicolas Lelong · 9 comments

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Quadro RTX 3000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.69

Blender Version
Broken: version: 2.93.0 Beta, branch: master, commit date: 2021-04-26 22:01, hash: 14b26fc976
Worked: None ? Same problem in various versions (2.83, 2.92)

Short description of error
When applying a bisect, it sometimes fail to cut a face crossed by the plane - the face disappears from the mesh.
Changing the Axis Threshold seem to change this behaviour.

Exact steps for others to reproduce the error

  • Open the attached blend file.
  • Select Mesh / Bisect operation
  • Draw some vectical line to start the operation
  • Then change the input values with :
    • Plane Point : 0.15m, 0, 0
    • Plane Normal : -1, 0, 0
    • Clear outer : enabled
  • The face disappears
  • Change the Axis Threshold value to 0.0 to have the face re-appear

bisect_bug3.blend
bisect_values_and_disappeared_face.jpg


Edit: added more complex test with mirror + bisect bisect_bug3_complex.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Quadro RTX 3000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.69 **Blender Version** Broken: version: 2.93.0 Beta, branch: master, commit date: 2021-04-26 22:01, hash: `14b26fc976` Worked: None ? Same problem in various versions (2.83, 2.92) **Short description of error** When applying a bisect, it sometimes fail to cut a face crossed by the plane - the face disappears from the mesh. Changing the Axis Threshold seem to change this behaviour. **Exact steps for others to reproduce the error** * Open the attached blend file. * Select Mesh / Bisect operation * Draw some vectical line to start the operation * Then change the input values with : * Plane Point : 0.15m, 0, 0 * Plane Normal : -1, 0, 0 * Clear outer : enabled * The face disappears * Change the Axis Threshold value to 0.0 to have the face re-appear [bisect_bug3.blend](https://archive.blender.org/developer/F10041984/bisect_bug3.blend) ![bisect_values_and_disappeared_face.jpg](https://archive.blender.org/developer/F10041987/bisect_values_and_disappeared_face.jpg) ---- Edit: added more complex test with mirror + bisect [bisect_bug3_complex.blend](https://archive.blender.org/developer/F10045217/bisect_bug3_complex.blend)
Author

Added subscriber: @rotoglup

Added subscriber: @rotoglup
Member

Added subscriber: @Calra

Added subscriber: @Calra
Member

Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'
Member

I can confirm this on Windows 10.
Thanks for the report.

It looks like a floating point error with threshold.
Default threshold value is 0.0001, manually retyping it to 0.0 fixes the issue as told by OP

I can confirm this on Windows 10. Thanks for the report. It looks like a floating point error with `threshold`. Default threshold value is `0.0001`, manually retyping it to `0.0` fixes the issue as told by OP
Member

Added subscriber: @PratikPB2123

Added subscriber: @PratikPB2123
Member

Can reproduce with attached file but not able to reproduce even with a simple cube mesh

Can reproduce with attached file but not able to reproduce even with a simple cube mesh

This issue was referenced by 0b61b75151

This issue was referenced by 0b61b7515126cf4a2c64b72724b302d5d52aa8e4

This issue was referenced by d31d5523d5

This issue was referenced by d31d5523d53f9999a29cf47d6d74b8e53fee41e0

Changed status from 'Confirmed' to: 'Resolved'

Changed status from 'Confirmed' to: 'Resolved'
Campbell Barton self-assigned this 2021-04-29 08:16:37 +02:00
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Reference: blender/blender#87863
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