Edge collapse makes planar faces non-planar #51648

New Issue

JA 12 · 2017-05-28T22:35:58+02:00

JA 12 commented

2017-05-28 22:35:58 +02:00

Ubuntu 14.04, Gnome 3 fallback, nvidia graphics

Broken: 2.78.5 9f044cb422, 2.78c

Collapse edges makes planar faces/surfaces non-planar in the example case. It doesn't do that on all the faces/surfaces, and splitting high angle edges doesn't seem to have an effect on the end result.

Collapse edges result on the selected faces at the back. Meshes on the right column have high angle edges split. Mesh analysis tool is set to show the distortion

Exact steps for others to reproduce the error
collapse_nonplanar.blend

open file, X -> collapse edges

The example case was created by adding a cone with 3 vertices, subdividing all the triangles once, then subdividing all of the newly created triangles in the middle once more

Ubuntu 14.04, Gnome 3 fallback, nvidia graphics Broken: 2.78.5 9f044cb422, 2.78c Collapse edges makes planar faces/surfaces non-planar in the example case. It doesn't do that on all the faces/surfaces, and splitting high angle edges doesn't seem to have an effect on the end result. ![collapse_nonplanar.png](https://archive.blender.org/developer/F611481/collapse_nonplanar.png) Collapse edges result on the selected faces at the back. Meshes on the right column have high angle edges split. Mesh analysis tool is set to show the distortion **Exact steps for others to reproduce the error** [collapse_nonplanar.blend](https://archive.blender.org/developer/F611484/collapse_nonplanar.blend) - open file, X -> collapse edges The example case was created by adding a cone with 3 vertices, subdividing all the triangles once, then subdividing all of the newly created triangles in the middle once more

JA 12 commented

2017-05-28 22:35:58 +02:00

Changed status to: 'Open'

JA 12 commented

2017-05-28 22:35:58 +02:00

Added subscriber: @ja12

Joel Godin commented

2017-05-28 23:35:49 +02:00

Added subscriber: @FloridaJo

Joel Godin commented

2017-05-28 23:35:49 +02:00

Yes. Confirmed.
Subdividing just a triangle and collapsing the edges does not make the face non-planar.
But faces on different sides of this cone, does.

Yes. Confirmed. Subdividing just a triangle and collapsing the edges does not make the face non-planar. But faces on different sides of this cone, does.

Luca Rood self-assigned this 2017-06-09 09:47:22 +02:00

blender-admin commented

2017-06-09 09:56:19 +02:00

This issue was referenced by ab4b7b5368

This issue was referenced by ab4b7b5368c0dc3b3d6dbc9a63a45f8efc841d80

Luca Rood commented

2017-06-09 10:05:23 +02:00

Changed status from 'Open' to: 'Resolved'

Luca Rood closed this issue

2017-06-09 10:05:23 +02:00

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Edge collapse makes planar faces non-planar #51648