【Bug Report】 The hair particles don't move with rigid body simulation #69419

New Issue

Zijun Zhou · 2019-09-02T18:52:36+02:00

Zijun Zhou commented

2019-09-02 18:52:36 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce MX130/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.99

Blender Version
Broken: version: 2.81 (sub 4), branch: master, commit date: 2019-09-02 15:37, hash: 283d96de11
Worked: (optional)

Short description of error
The bug happens when using hair particles and rigid body simulation at the same time, the hair particles stay where they were, while the mesh itself is falling. Eventually I had to "Ctrl Z" once, then it would work.

Exact steps for others to reproduce the error
I tried to attach the .blend file, but I found out that the bug can only be reproduced locally

Add particle system to the default cube, select Hair, and check "Hair Dynamics"
Go to "Physics" tab, and click "Rigid Body"
Under "Rigid Body", change the "Shape" under "Collision" to "Mesh", and "Source" to "Base"
Press Space bar to play the animation, then you'll see the hair particles stay
Press Space bar again to stop the animation, then press Ctrl Z to undo
Now press Space bar to play the animation again, the hair particles are now moving with the mesh

Note that once you "undo" a mesh, the hair particles on the mesh will never stay in the mid air again, even if you reload the .blend file, they would still move with the mesh. If you want to reproduce the error again after the above steps, you will need to add a new mesh and do that again

I believe that this is a bug, because I don't believe that there would be a feature that requires the user to "Ctrl Z" once before using it.

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce MX130/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.99 **Blender Version** Broken: version: 2.81 (sub 4), branch: master, commit date: 2019-09-02 15:37, hash: `283d96de11` Worked: (optional) **Short description of error** The bug happens when using hair particles and rigid body simulation at the same time, the hair particles stay where they were, while the mesh itself is falling. Eventually I had to "Ctrl Z" once, then it would work. **Exact steps for others to reproduce the error** I tried to attach the .blend file, but I found out that the bug can only be reproduced locally 1. Add particle system to the default cube, select Hair, and check "Hair Dynamics" 2. Go to "Physics" tab, and click "Rigid Body" 3. Under "Rigid Body", change the "Shape" under "Collision" to "Mesh", and "Source" to "Base" 4. Press Space bar to play the animation, then you'll see the hair particles stay 5. Press Space bar again to stop the animation, then press Ctrl Z to undo 6. Now press Space bar to play the animation again, the hair particles are now moving with the mesh **Note that once you "undo" a mesh, the hair particles on the mesh will never stay in the mid air again, even if you reload the .blend file, they would still move with the mesh. If you want to reproduce the error again after the above steps, you will need to add a new mesh and do that again** I believe that this is a bug, because I don't believe that there would be a feature that requires the user to "Ctrl Z" once before using it.

Zijun Zhou commented

2019-09-02 18:52:36 +02:00

Added subscriber: @Eary

Stephen Swaney commented

2019-09-02 19:51:11 +02:00

Added subscriber: @StephenSwaney

Stephen Swaney commented

2019-09-02 19:51:11 +02:00

Having a .blend would make this easier to debug.

Zijun Zhou commented

2019-09-02 20:26:46 +02:00

In #69419#767764, @StephenSwaney wrote:
Having a .blend would make this easier to debug.

I tried to attach the .blend file, but I found out that the bug cannot be reproduced through it. Now I think it may has something to do with the .blend1 file.

> In #69419#767764, @StephenSwaney wrote: > Having a .blend would make this easier to debug. I tried to attach the .blend file, but I found out that the bug cannot be reproduced through it. Now I think it may has something to do with the .blend1 file.

Philipp Oeser commented

2019-09-03 09:08:54 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-09-03 09:08:54 +02:00

This has the same roots as #58044

Philipp Oeser commented

2019-09-03 09:09:05 +02:00

Closed as duplicate of #58044

Philipp Oeser closed this issue

2019-09-03 09:09:05 +02:00

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【Bug Report】 The hair particles don't move with rigid body simulation #69419