Mirror modifier does not mirror vertex normals when there are no faces. #36301

New Issue

Ryan Twitchell · 2013-07-27T19:35:37+02:00

Ryan Twitchell commented

2013-07-27 19:35:37 +02:00

%%%--- Operating System, Graphics card ---
Gentoo Linux x86_64
Kernel version 3.9.8
NVIDIA GeForce GTX 560

- Blender version with error, and version that worked ---

blender.org build version 2.68a

- Short description of error ---

When there are no faces in a mesh (as when working with the skin modifier) and the mesh has a mirror modifier, vertex normals on the mirrored copies of vertices point in the same direction as their source verticies, rather than being mirrored.

- Steps for others to reproduce the error (preferably based on attached .blend file) ---

From a factory default file:

Enter edit mode for the default cube.
Turn on display vertex normals under Mesh Display.
Select all vertices delete them.
Add a mirror modifier.
5.Turn on "Apply modifier to editing cage..."
Create a single vertex.

The normals for the new vertex and its mirrored copy will be pointing in the same direction, rather than opposite. This will continue to affect other vertices until a face is created. Recalculating normals does not correct this, but applying the modifier will result in correctly mirrored normals.
%%%

%%%--- Operating System, Graphics card --- Gentoo Linux x86_64 Kernel version 3.9.8 NVIDIA GeForce GTX 560 - Blender version with error, and version that worked --- blender.org build version 2.68a - Short description of error --- When there are no faces in a mesh (as when working with the skin modifier) and the mesh has a mirror modifier, vertex normals on the mirrored copies of vertices point in the same direction as their source verticies, rather than being mirrored. - Steps for others to reproduce the error (preferably based on attached .blend file) --- From a factory default file: 1. Enter edit mode for the default cube. 2. Turn on display vertex normals under Mesh Display. 3. Select all vertices delete them. 4. Add a mirror modifier. 5.Turn on "Apply modifier to editing cage..." 6. Create a single vertex. The normals for the new vertex and its mirrored copy will be pointing in the same direction, rather than opposite. This will continue to affect other vertices until a face is created. Recalculating normals does not correct this, but applying the modifier will result in correctly mirrored normals. %%%

Ryan Twitchell commented

2013-07-27 19:35:37 +02:00

Changed status to: 'Open'

Campbell Barton commented

2013-08-27 04:25:47 +02:00

%%%fixed r59547.%%%

Campbell Barton commented

2013-08-27 04:25:48 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2013-08-27 04:25:48 +02:00

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Mirror modifier does not mirror vertex normals when there are no faces. #36301