BLender 2.8 cloth and rigid body #60079

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david · 2019-01-02T19:08:38+01:00

david commented

2019-01-02 19:08:38 +01:00

System Information
Operating system: windows 7
Graphics card: gtx 970 4GO
Core i5-2500k RAM 8GO

Blender Version 2.80, d96596de29

Short description of error

When i create a simulation between a cloth and a rigib body, it's doesn't work in blender 2.8

In blender 2.79 i create a plane with 40 subdivisions, then i put cloth physic after i create a sphere and put it as "rigid body" mode sphere + collision modifier in physic tab; then i create an interaction between the cloth and the rigib body shpere and it's work in blender 2.79
The sphere touch the cloth and the cloth deforming well ! But
If i try do do the scene in blender 2.80 the cloth not deforming when the rigid body "sphere" touch the cloth.
If i put my file from blender 2.79 in blender 2.80 it's work but if i use free bake and try to bake again it's does'nt work.
So, the problem his interaction between cloth and rigid body in blender 2.8

**System Information** Operating system: windows 7 Graphics card: gtx 970 4GO Core i5-2500k RAM 8GO **Blender Version** 2.80, d96596de294e **Short description of error** When i create a simulation between a cloth and a rigib body, it's doesn't work in blender 2.8 In blender 2.79 i create a plane with 40 subdivisions, then i put cloth physic after i create a sphere and put it as "rigid body" mode sphere + collision modifier in physic tab; then i create an interaction between the cloth and the rigib body shpere and it's work in blender 2.79 The sphere touch the cloth and the cloth deforming well ! But If i try do do the scene in blender 2.80 the cloth not deforming when the rigid body "sphere" touch the cloth. If i put my file from blender 2.79 in blender 2.80 it's work but if i use free bake and try to bake again it's does'nt work. So, the problem his interaction between cloth and rigid body in blender 2.8

david commented

2019-01-02 19:08:38 +01:00

Added subscriber: @dadou99

david changed title from ~~BLender 2.8 cloth ans rigid body~~ to BLender 2.8 cloth and rigid body

2019-01-02 19:11:01 +01:00

Stephen Swaney commented

2019-01-03 16:24:53 +01:00

Added subscriber: @StephenSwaney

Stephen Swaney commented

2019-01-03 16:24:53 +01:00

Do you have a .blend showing the problem?

david commented

2019-01-03 21:26:57 +01:00

the blend file is made in blender 2.78
The ground is a plane with rigid body passive
the cube is the same
the sphere is active body with collision modifier
the plane with checker texture is the cloth
As you can see in the picture it's work correctly in blender 2.79 the collision between rigib body sphere and the cloth. But in blender 2.80 the sphere just goes throught the cloth. The cloth don't move with the collision of the sphere.
{F6163785}cltoh and rigid body.blend

the blend file is made in blender 2.78 The ground is a plane with rigid body passive the cube is the same the sphere is active body with collision modifier the plane with checker texture is the cloth As you can see in the picture it's work correctly in blender 2.79 the collision between rigib body sphere and the cloth. But in blender 2.80 the sphere just goes throught the cloth. The cloth don't move with the collision of the sphere. {[F6163785](https://archive.blender.org/developer/F6163785/Sans_titre.png)}[cltoh and rigid body.blend](https://archive.blender.org/developer/F6163702/cltoh_and_rigid_body.blend)

david commented

2019-01-03 21:48:07 +01:00

this is a short exemple in blender 2.79 a sphere rigid body enter in collision with the cloth.

blender 2.790060-0090.avi

this is a short exemple in blender 2.79 a sphere rigid body enter in collision with the cloth. [blender 2.790060-0090.avi](https://archive.blender.org/developer/F6163980/blender_2.790060-0090.avi)

Sebastian Parborg commented

2019-01-24 17:16:11 +01:00

Added subscribers: @brecht, @ZedDB

Sergej Reich was assigned by Sebastian Parborg

2019-01-24 17:16:11 +01:00

Sebastian Parborg commented

2019-01-24 17:16:11 +01:00

It seems like the rigid body movement is not synced to the collision mesh. I can get the cloth to collide with the ball, but only on its start position.
The cloth collides with the ball as if it were static even though the ball is rolling away.

@brecht is sergof the right person for this?

It seems like the rigid body movement is not synced to the collision mesh. I can get the cloth to collide with the ball, but only on its start position. The cloth collides with the ball as if it were static even though the ball is rolling away. @brecht is sergof the right person for this?

Tom Grod commented

2019-04-13 13:59:01 +02:00

Added subscriber: @SmartySmart702

Tom Grod commented

2019-04-13 13:59:01 +02:00

In #60079#606111, @ZedDB wrote:
It seems like the rigid body movement is not synced to the collision mesh. I can get the cloth to collide with the ball, but only on its start position.
The cloth collides with the ball as if it were static even though the ball is rolling away.

@brecht is sergof the right person for this?

So will this be fixed? I have the same problem now :(

> In #60079#606111, @ZedDB wrote: > It seems like the rigid body movement is not synced to the collision mesh. I can get the cloth to collide with the ball, but only on its start position. > The cloth collides with the ball as if it were static even though the ball is rolling away. > > @brecht is sergof the right person for this? So will this be fixed? I have the same problem now :(

michael campbell commented

2019-07-07 00:40:25 +02:00

Added subscriber: @3di

michael campbell commented

2019-07-07 00:40:25 +02:00

same proble here, is there a solution yet? I'm using todays 2.8 build.

Sebastian Parborg commented

2019-07-08 18:03:22 +02:00

Added subscriber: @Sergey

Sebastian Parborg commented

2019-07-08 18:03:22 +02:00

@Sergey do you want to take a look at this?

Sergey Sharybin commented

2019-07-09 11:05:52 +02:00

This has same roots as #58044.

Rigid body needs to know object's transform and geometry to perform proper collision detection. This makes it so modifier stack is run prior to rigid body moving the object to its new place. This makes it so BVH needed for cloth collision is constructed prior the final transform is know, making it so cloth "sees" original pre-rigid-body position of the colliding object.

This has same roots as #58044. Rigid body needs to know object's transform and geometry to perform proper collision detection. This makes it so modifier stack is run prior to rigid body moving the object to its new place. This makes it so BVH needed for cloth collision is constructed prior the final transform is know, making it so cloth "sees" original pre-rigid-body position of the colliding object.

Sergey Sharybin commented

2019-07-09 11:06:06 +02:00

Closed as duplicate of #58044

Sergey Sharybin closed this issue

2019-07-09 11:06:06 +02:00

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BLender 2.8 cloth and rigid body #60079