The parenting not working right with RigidBodyConstraints (motor) #72107

New Issue

Gabor Horvath · 2019-12-02T09:11:24+01:00

Gabor Horvath commented

2019-12-02 09:11:24 +01:00

{F8184671}System Information
Operating system: Windows-10-10.0.16299 64 Bits
Graphics card: GeForce GT 730M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 389.08

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: 26bd5ebd42
Worked: (optional)

Short description of error
When I would like use rigid body constraints then I can't use the parenting child of nor ctrl+p
The fixed constraint works but the flickering is appear

Exact steps for others to reproduce the error
0. see the video (fastest way)

create two cubes (pos 0,0,0 3,0,0)
The cubes are rigid bodies and all have a rigid body constraint
the first cube is passive
the first cubes constraints type = generic and all limit enabled with 0.0 values except the X ROT limit disabed
the second cubes constraints type is motor with angle enabled
the constraints object1 = first object
the constraints object2 = second object
Create a third cube (6.0.0) (rigid body)
9 Use this cube for parenting to cube2 (child of or ctrl+p) will not working

#72107.blend

{[F8184671](https://archive.blender.org/developer/F8184671/2019-12-02_08-48-41.mp4)}**System Information** Operating system: Windows-10-10.0.16299 64 Bits Graphics card: GeForce GT 730M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 389.08 **Blender Version** Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: `26bd5ebd42` Worked: (optional) **Short description of error** When I would like use rigid body constraints then I can't use the parenting child of nor ctrl+p The fixed constraint works but the flickering is appear **Exact steps for others to reproduce the error** 0. see the video (fastest way) 1. create two cubes (pos 0,0,0 3,0,0) 2. The cubes are rigid bodies and all have a rigid body constraint 3. the first cube is passive 4. the first cubes constraints type = generic and all limit enabled with 0.0 values except the X ROT limit disabed 5. the second cubes constraints type is motor with angle enabled 6. the constraints object1 = first object 7. the constraints object2 = second object 8. Create a third cube (6.0.0) (rigid body) 9 Use this cube for parenting to cube2 (child of or ctrl+p) will not working [#72107.blend](https://archive.blender.org/developer/F8184810/T72107.blend)

Gabor Horvath commented

2019-12-02 09:11:24 +01:00

Added subscriber: @hgabor47

Philipp Oeser commented

2019-12-02 11:13:58 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-12-02 11:13:58 +01:00

Can confirm.
We are getting dependency cylces detected:

Dependency cycle detected:
  OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() depends on
  OBgeneric/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint -> RBC.Object_1'
  OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final'
Dependency cycle detected:
  OBmotor/Transform Component/TRANSFORM_FINAL() depends on
  OBmotor/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final'
  OBgeneric/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint -> RBC.Object_2'
  OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final'
  OBmotor/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint -> RBC.Object_1'
Dependency cycle detected:
  OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() depends on
  SCScene/Transform Component/RIGIDBODY_SIM() via 'Rigidbody Sim Eval -> RBO Sync'
  OBgeneric/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint Transform -> RB Simulation'
  OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final'
Detected 3 dependency cycles

This might have the same roots as {#58044}?

Can confirm. We are getting dependency cylces detected: ``` Dependency cycle detected: OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() depends on OBgeneric/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint -> RBC.Object_1' OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final' Dependency cycle detected: OBmotor/Transform Component/TRANSFORM_FINAL() depends on OBmotor/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final' OBgeneric/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint -> RBC.Object_2' OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final' OBmotor/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint -> RBC.Object_1' Dependency cycle detected: OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() depends on SCScene/Transform Component/RIGIDBODY_SIM() via 'Rigidbody Sim Eval -> RBO Sync' OBgeneric/Transform Component/TRANSFORM_FINAL() via 'RigidBodyConstraint Transform -> RB Simulation' OBgeneric/Transform Component/RIGIDBODY_TRANSFORM_COPY() via 'Rigidbody Sync -> Transform Final' Detected 3 dependency cycles ``` This might have the same roots as {#58044}?

Philipp Oeser commented

2019-12-02 11:23:09 +01:00

Even though this smeels like #58044 (Issue with rigid body and modifiers dependent on transform) I am keeping this open since there is nothing reported for the actually parented object....

Philipp Oeser commented

2019-12-02 11:24:42 +01:00

Added subscriber: @Sergey

Philipp Oeser commented

2019-12-02 11:24:42 +01:00

CC @Sergey

Philipp Oeser commented

2019-12-02 11:41:01 +01:00

Actually, if you use a separate object [empty] as the constraint between the two objects (as this is done automatically when you use the Object > Rigid Body > Connect), it is working fine...

T72107_corrected.blend

Actually, if you use a separate object [empty] as the constraint between the two objects (as this is done automatically when you use the `Object` > `Rigid Body` > `Connect`), it is working fine... [T72107_corrected.blend](https://archive.blender.org/developer/F8184838/T72107_corrected.blend)

Philipp Oeser commented

2019-12-02 11:44:08 +01:00

@Sergey: this was fine(ish) in 2.79 (but I assume with the quirks mentioned in #58044 (Issue with rigid body and modifiers dependent on transform)), so doing it with the intermediate object resolves...
Can we close this?

@Sergey: this was fine(ish) in 2.79 (but I assume with the quirks mentioned in #58044 (Issue with rigid body and modifiers dependent on transform)), so doing it with the intermediate object resolves... Can we close this?

Philipp Oeser commented

2019-12-02 11:55:52 +01:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2019-12-02 11:55:52 +01:00

Philipp Oeser self-assigned this 2019-12-02 11:55:52 +01:00

Philipp Oeser commented

2019-12-02 11:55:52 +01:00

I'll dare to close both this report and #72042 reports now, it is different from 2.79, but if used as suggested seems to work just fine...
(@hgabor47 feel free though to comment again if issues persist...)

I'll dare to close both this report and #72042 reports now, it is different from 2.79, but if used as suggested seems to work just fine... (@hgabor47 feel free though to comment again if issues persist...)

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The parenting not working right with RigidBodyConstraints (motor) #72107