Subsurf (adjust edit cage to modifier result disabled) and armature modifier (adjust edit cage to modifier result enabled) causes transformation distortion on certain vertices #54292

New Issue

Henrik Berglund · 2018-03-11T16:22:56+01:00

Henrik Berglund commented

2018-03-11 16:22:56 +01:00

System Information
Win8, GTX1070

Blender Version
Broken: 2.79 release and master

Short description of error

Subsurf (adjust edit cage to modifier result disabled) and armature modifier (adjust edit cage to modifier result enabled) causes transformation distortion on certain vertices. Meaning, if you select certain vertices and transform then they won't follow the cursor but will be distorted.

Exact steps for others to reproduce the error
Attached blend: bug_edit_cage_subsurf_armature.blend Just select the top vertices and move up along Z axis.

Create a cube.
Add a loopcut in the middle.
Add an armature (bone).
Automatically weigh the cube to the armature.
Add a subsurf modifier to the cube.
Make sure adjust edit cage to modifier is disabled for subsurface modifier and enabled for armature.
Select the top vertices of the cube and move them along the Z axis (axis lock).
Result: Top vertices don't follow the Z axis but the movement is distorted.
Expected: Top vertices follow the Z axis.

Enabling adjust edit cage to modifier for the subsurf modifier too fixes the problem.

**System Information** Win8, GTX1070 **Blender Version** Broken: 2.79 release and master **Short description of error** Subsurf (adjust edit cage to modifier result disabled) and armature modifier (adjust edit cage to modifier result enabled) causes transformation distortion on certain vertices. Meaning, if you select certain vertices and transform then they won't follow the cursor but will be distorted. **Exact steps for others to reproduce the error** Attached blend: [bug_edit_cage_subsurf_armature.blend](https://archive.blender.org/developer/F2434967/bug_edit_cage_subsurf_armature.blend) Just select the top vertices and move up along Z axis. 1. Create a cube. 2. Add a loopcut in the middle. 3. Add an armature (bone). 4. Automatically weigh the cube to the armature. 5. Add a subsurf modifier to the cube. 6. Make sure adjust edit cage to modifier is disabled for subsurface modifier and enabled for armature. 7. Select the top vertices of the cube and move them along the Z axis (axis lock). Result: Top vertices don't follow the Z axis but the movement is distorted. Expected: Top vertices follow the Z axis. Enabling adjust edit cage to modifier for the subsurf modifier too fixes the problem.

Henrik Berglund commented

2018-03-11 16:22:56 +01:00

Added subscriber: @cyaoeu

Ray molenkamp commented

2018-03-11 16:52:37 +01:00

Added subscriber: @LazyDodo

Ray molenkamp commented

2018-03-11 16:52:37 +01:00

Can confirm the behavior, but unable to say if it's working 'as designed' or not.

Philipp Oeser commented

2020-01-30 14:22:52 +01:00

Added subscribers: @mano-wii, @lichtwerk

Philipp Oeser commented

2020-01-30 14:22:52 +01:00

In #50597#853881, @mano-wii wrote:
This is a limitation of the transform system that does not use the modifier's crazyspace correction.
However, this could be supported...

@mano-wii: not exactly sure if this applies here as well? (strange thing is that the armature doesn not really contribute any deformation at all...)

> In #50597#853881, @mano-wii wrote: > This is a limitation of the transform system that does not use the modifier's crazyspace correction. > However, this could be supported... @mano-wii: not exactly sure if this applies here as well? (strange thing is that the armature doesn not really contribute any deformation at all...)

Germano Cavalcante commented

2020-01-30 15:15:31 +01:00

I was actually wrong.
The trasform system supports crazyspace correction! (Gizmo is a different system).
The problem here is that the crasyspace is being calculated incorrectly.

I was actually wrong. The trasform system **supports** crazyspace correction! (Gizmo is a different system). The problem here is that the crasyspace is being calculated incorrectly.

blender-admin commented

2020-02-01 03:58:32 +01:00

This issue was referenced by bf8a26b745

This issue was referenced by bf8a26b7453d9b980a77452c3510afba0d35af01

Germano Cavalcante commented

2020-02-01 03:59:11 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Germano Cavalcante closed this issue

2020-02-01 03:59:11 +01:00

Germano Cavalcante self-assigned this 2020-02-01 03:59:11 +01:00

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Subsurf (adjust edit cage to modifier result disabled) and armature modifier (adjust edit cage to modifier result enabled) causes transformation distortion on certain vertices #54292