Dynamicly changed weight paint does not affect Shape Keys #97767

New Issue

Aleksander Wisniewski · 2022-05-02T09:07:26+02:00

2022-05-02 09:07:26 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15

Blender Version
Broken: version: 3.1.2, branch: addon_v3.0_octane2021 (modified), commit date: 2022-04-27 03:29, hash: 5dfefe58f0
Worked: (newest version of Blender that worked as expected)

Short description of error
If you have weight paint that is being set dynamically - for example by using dynamic paint and a shape key that uses vertex group same as the one being modified, there is no change in the shape even if weight was changed.

Exact steps for others to reproduce the error
Reproduction steps:

Create sphere
Create Basis and Key 1 shape keys and set value to 1
Enter edit mode and modify the shape key (for example resize the sphere), then exit edit mode
Add Vertex group
Set the new group in the Vertex Group in the shape key
Add dynamic paint, canvas, Surface Type : Weight, Output: Vertex Group : Group
Add second sphere
On second sphere add Dynamic Paint : Brush, surface: Volume + Proximity
Create animation where one ball is 2 ball lengths apart and gets as close as to touch the other ball

Result: In weight paint mode observe that weight changes, but the shape is not affected.
Bonus round: Paint the weight paint manually and observe object changing

I have tested it on Blender 3.1 and Blender 3.0, both have this problem

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15 **Blender Version** Broken: version: 3.1.2, branch: addon_v3.0_octane2021 (modified), commit date: 2022-04-27 03:29, hash: `5dfefe58f0` Worked: (newest version of Blender that worked as expected) **Short description of error** If you have weight paint that is being set dynamically - for example by using dynamic paint and a shape key that uses vertex group same as the one being modified, there is no change in the shape even if weight was changed. **Exact steps for others to reproduce the error** Reproduction steps: 1. Create sphere 2. Create Basis and Key 1 shape keys and set value to 1 3. Enter edit mode and modify the shape key (for example resize the sphere), then exit edit mode 4. Add Vertex group 5. Set the new group in the Vertex Group in the shape key 6. Add dynamic paint, canvas, Surface Type : Weight, Output: Vertex Group : Group 7. Add second sphere 8. On second sphere add Dynamic Paint : Brush, surface: Volume + Proximity 9. Create animation where one ball is 2 ball lengths apart and gets as close as to touch the other ball Result: In weight paint mode observe that weight changes, but the shape is not affected. Bonus round: Paint the weight paint manually and observe object changing I have tested it on Blender 3.1 and Blender 3.0, both have this problem

Aleksander Wisniewski commented

2022-05-02 09:07:26 +02:00

Added subscriber: @exverxes

Aleksander Wisniewski commented

2022-05-02 09:12:34 +02:00

Added quick demonstration video showing problem: https://youtu.be/mhAbRRfYAmY

Philipp Oeser commented

2022-05-02 09:57:29 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-05-02 09:57:29 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2022-05-02 09:57:29 +02:00

To speed up the process: please share your example .blend file, thx in advance.

Philipp Oeser commented

2022-05-02 10:03:07 +02:00

In fact, this is the same problem as described here #90276 (ShapeKey does not "see" modified Vertex Group (e.g. proximity modifier, dynamic paint)), so this is not really a bug, more of a design limitation in current blender.
Please have a look ath the other report for details, will merge reports.

In fact, this is the same problem as described here #90276 (ShapeKey does not "see" modified Vertex Group (e.g. proximity modifier, dynamic paint)), so this is not really a bug, more of a design limitation in current blender. Please have a look ath the other report for details, will merge reports.

Philipp Oeser commented

2022-05-02 10:03:15 +02:00

Closed as duplicate of #90276

Philipp Oeser closed this issue

2022-05-02 10:03:15 +02:00

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Dynamicly changed weight paint does not affect Shape Keys #97767