Regression: Mesh Deform modifier stops working on a linked collection upon undo #98626

New Issue

Steffen Dünner · 2022-06-06T13:10:42+02:00

Steffen Dünner commented

2022-06-06 13:10:42 +02:00

System Information
Operating system: Linux-5.15.0-33-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.43.04

Blender Version
Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-06-06 07:42, hash: 7eb2018a0b
Worked: 3.2beta

Caused by b66368f3fd

Short description of error
I have a weird "modifier stops working" problem in a production scene with a not too complex rig (Armature, Driver, Mesh Deformer). It's kind of hard to describe but I built a very simple repro scene.
The "rig" itself is just two bones, one to transform an object and another bone parented to the first which controls the intensity of a "Simple Deform" modifier (via a Driver) that deforms the object.
The object (called "Cage" in the repro scene) is then used in a "Mesh Deform" modifier to deform a second object (a torus called "Torus" ;) ).
Everything works as expected until I go to a Graph Editor, change a keyframe on one of the bone's animation curve and then undo. Then all of a sudden the deformation of the Mesh Deform stops working. The torus is no longer squashed until I go to the Outliner > Blender File and then reload the linked library.

Exact steps for others to reproduce the error

Download and unpack the ZIP
BUG_Rigrefresh_v01.zip
Open the file "BUG_ANI_Rigrefresh_v01.blend" in Blender
It's the rig I described above, linked into a fresh scene, overridden to be animated. The two things that are animated are the x-location of the first bone and the y-location of the second (which controls the deformation of the cage object).
Scrub through the timeline and see the cage and torus objects move and deform
Now go to frame 50 (or any other frame where the torus is deformed), change one of the two keyframes of the bone called "Bone" and then undo the change.
The torus is now no longer deformed
Scrub through the timeline and see the cage object still changing its shape but the torus is no longer "attached"

2022-06-06 13-07-35.mp4

**System Information** Operating system: Linux-5.15.0-33-generic-x86_64-with-glibc2.31 64 Bits Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.43.04 **Blender Version** Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-06-06 07:42, hash: `7eb2018a0b` Worked: 3.2beta Caused by b66368f3fd **Short description of error** I have a weird "modifier stops working" problem in a production scene with a not too complex rig (Armature, Driver, Mesh Deformer). It's kind of hard to describe but I built a very simple repro scene. The "rig" itself is just two bones, one to transform an object and another bone parented to the first which controls the intensity of a "Simple Deform" modifier (via a Driver) that deforms the object. The object (called "Cage" in the repro scene) is then used in a "Mesh Deform" modifier to deform a second object (a torus called "Torus" ;) ). Everything works as expected until I go to a Graph Editor, change a keyframe on one of the bone's animation curve and then undo. Then all of a sudden the deformation of the Mesh Deform stops working. The torus is no longer squashed until I go to the Outliner > Blender File and then reload the linked library. **Exact steps for others to reproduce the error** - Download and unpack the ZIP [BUG_Rigrefresh_v01.zip](https://archive.blender.org/developer/F13134869/BUG_Rigrefresh_v01.zip) - Open the file "BUG_ANI_Rigrefresh_v01.blend" in Blender - It's the rig I described above, linked into a fresh scene, overridden to be animated. The two things that are animated are the x-location of the first bone and the y-location of the second (which controls the deformation of the cage object). - Scrub through the timeline and see the cage and torus objects move and deform - Now go to frame 50 (or any other frame where the torus is deformed), change one of the two keyframes of the bone called "Bone" and then undo the change. - The torus is now no longer deformed - Scrub through the timeline and see the cage object still changing its shape but the torus is no longer "attached" [2022-06-06 13-07-35.mp4](https://archive.blender.org/developer/F13134911/2022-06-06_13-07-35.mp4)

Steffen Dünner commented

2022-06-06 13:10:42 +02:00

Added subscriber: @SteffenD

Iliya Katushenock commented

2022-06-06 19:32:07 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-06-06 19:32:07 +02:00

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

Iliya Katushenock commented

2022-06-06 19:32:07 +02:00

There is confirmation. The Mesh Deform modifier stops working correctly after the first undo in the project (you can immediately enter the object mode and click undo)
My suspicion is that the problem is who owns the modifier, the original project, or the link

There is confirmation. The Mesh Deform modifier stops working correctly after the first undo in the project (you can immediately enter the object mode and click undo) My suspicion is that the problem is who owns the modifier, the original project, or the link

Germano Cavalcante commented

2022-06-06 21:06:15 +02:00

Added subscriber: @mano-wii

Philipp Oeser commented

2022-06-07 08:46:40 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-06-07 08:46:40 +02:00

Seems this is a regression, will check

Philipp Oeser commented

2022-06-07 09:24:55 +02:00

Caused by b66368f3fd

Caused by b66368f3fd

Philipp Oeser changed title from ~~Modifier stops working on a linked collection~~ to Regression: Mesh Deform modifier stops working on a linked collection upon undo

2022-06-07 09:25:58 +02:00

Philipp Oeser commented

2022-06-07 09:26:27 +02:00

Added subscriber: @mont29