Regression: Duplicating the object and separating it by loose parts wipes vertex group weights of the original object #113386

New Issue

Bstabuu · 2023-10-07T13:06:13+02:00

Bstabuu commented

2023-10-07 13:06:13 +02:00

System Information
Operating system: Linux-5.15.0-83-generic-x86_64-with-glibc2.31 64 Bits, X11 UI
Graphics card: Radeon RX 560 Series (POLARIS11, DRM 3.42.0, 5.15.0-83-generic, LLVM 12.0.0) AMD 4.6 (Core Profile) Mesa 21.2.6
CPU: Ryzen 5600G
16GB DDR4

Blender Version
Broken: version: 3.6.0 Alpha, branch: main, commit date: 2023-04-15 01:59, hash: b601ae87d064
Worked: version: 3.6.0 Alpha, branch: main, commit date: 2023-04-12 22:05, hash: d48939f103c0

Short description of error
If I rig a mesh that has disconnected geometry, duplicate it and then separate the duplicated mesh by loose parts, the original mesh will lose its vertex group weights(vertex groups will stay but they will become empty). Duplicated & separated meshes will retain vertex group weights of the original mesh.

Exact steps for others to reproduce the error

Add a cube object.
Go to the edit mode, select all geometry, duplicate it and move it up in Z axis.
Create an armature with 2 bones and align them with the geometry.
Parent the cube object to the armature with automatic weights.
Move the bones in pose mode to confirm that the cube object is rigged.
Duplicate the rigged cube object.
Select the duplicated cube object, go to edit mode and separate by loose parts.
Try moving the bones in pose mode again - the duplicated and separated cube objects will move, the original cube object will not.

Reproduced with 3.6.2 on Linux and 3.6.0 on Windows 10. Also reproduced with manually assigned vertex groups on a complex robot model.
Also reproduced with daily build: blender-3.6.5-candidate+v36.49ef671e7b92-linux.x86_64.

**System Information** Operating system: Linux-5.15.0-83-generic-x86_64-with-glibc2.31 64 Bits, X11 UI Graphics card: Radeon RX 560 Series (POLARIS11, DRM 3.42.0, 5.15.0-83-generic, LLVM 12.0.0) AMD 4.6 (Core Profile) Mesa 21.2.6 CPU: Ryzen 5600G 16GB DDR4 **Blender Version** Broken: version: 3.6.0 Alpha, branch: main, commit date: 2023-04-15 01:59, hash: `b601ae87d064` Worked: version: 3.6.0 Alpha, branch: main, commit date: 2023-04-12 22:05, hash: `d48939f103c0` **Short description of error** If I rig a mesh that has disconnected geometry, duplicate it and then separate the duplicated mesh by loose parts, the original mesh will lose its vertex group weights(vertex groups will stay but they will become empty). Duplicated & separated meshes will retain vertex group weights of the original mesh. **Exact steps for others to reproduce the error** 1. Add a cube object. 2. Go to the edit mode, select all geometry, duplicate it and move it up in Z axis. 3. Create an armature with 2 bones and align them with the geometry. 4. Parent the cube object to the armature with automatic weights. 5. Move the bones in pose mode to confirm that the cube object is rigged. 6. Duplicate the rigged cube object. 7. Select the duplicated cube object, go to edit mode and separate by loose parts. 8. Try moving the bones in pose mode again - the duplicated and separated cube objects will move, the original cube object will not. Reproduced with 3.6.2 on Linux and 3.6.0 on Windows 10. Also reproduced with manually assigned vertex groups on a complex robot model. Also reproduced with daily build: blender-3.6.5-candidate+v36.49ef671e7b92-linux.x86_64.

loose parts bug.blend

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Bstabuu added the

labels 2023-10-07 13:06:14 +02:00

Iliya Katushenock added this to the 3.6 LTS milestone 2023-10-07 13:07:37 +02:00

Iliya Katushenock changed title from ~~Duplicating the object and separating it by loose parts wipes vertex group weights of the original object~~ to Regression: Duplicating the object and separating it by loose parts wipes vertex group weights of the original object

2023-10-07 13:22:46 +02:00

Iliya Katushenock added

and removed