IK target add Copy Rotation Constraint cause render animation sequence repeat frist frame no pose change rendered #74390

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xueke pei · 2020-03-03T10:45:11+01:00

xueke pei commented

2020-03-03 10:45:11 +01:00

System Information
Operating system:window10
Graphics card: gtx1070

Blender Version
Broken: (example: 2.82,2.83 master
Worked: (newest version of Blender that worked as expected) unknown

Short description of error
IK target bone add Copy Rotation Constraint cause render animation sequence not change
render animation :the rendered image still show the first frame
but if render single image, the result is good

Exact steps for others to reproduce the error
1,add mesh subdiv sometimes
2,

 a, add armature, add four bone : 001 002 003 004   
 b,002 set **ik constraint**  target bone is 003 
 c,003 set **copy rotation constraint** target bone is 004

3, hit render --> render animation (Ctrl F12) finished, in file directory, there are copy of first frame all the pictures.

4,

  a,if remove the 003bone's constraint  Ctrl F12 works
  b, move time line in some frame, hit render --> render image (f12)  the pose render correct.

both eevee render and cycles has this problem.

simplify files :copyRotation.blend

**System Information** Operating system:window10 Graphics card: gtx1070 **Blender Version** Broken: (example: 2.82,2.83 master Worked: (newest version of Blender that worked as expected) unknown **Short description of error** IK target bone add Copy Rotation Constraint cause render animation sequence not change render animation :the rendered image still show the first frame but if render single image, the result is good **Exact steps for others to reproduce the error** 1,add mesh subdiv sometimes 2, ``` a, add armature, add four bone : 001 002 003 004 b,002 set **ik constraint** target bone is 003 c,003 set **copy rotation constraint** target bone is 004 ``` 3, hit render --> render animation (Ctrl F12) finished, in file directory, there are copy of first frame all the pictures. 4, ``` a,if remove the 003bone's constraint Ctrl F12 works b, move time line in some frame, hit render --> render image (f12) the pose render correct. ``` both eevee render and cycles has this problem. simplify files :[copyRotation.blend](https://archive.blender.org/developer/F8384709/copyRotation.blend)

xueke pei commented

2020-03-03 10:45:11 +01:00

Added subscriber: @xuekepei

Germano Cavalcante commented

2020-03-03 14:36:19 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-03-03 14:36:19 +01:00

This file has a dependency cycle.
See console:

Dependency cycle detected:
  OBtest/Bone/POSE_IK_SOLVER() depends on
  OBtest/Bone.003/BONE_DONE() via 'IK'
  OBtest/Bone.003/BONE_READY() via 'Ready -> Done'
  OBtest/Bone.003/BONE_CONSTRAINTS() via 'Constraints -> Ready'
  OBtest/Bone.002/BONE_DONE() via 'Copy Rotation'
  OBtest/Bone.002/BONE_READY() via 'Ready -> Done'
  OBtest/Bone.002/BONE_POSE_PARENT() via 'Pose -> Ready'
  OBtest/Bone.001/BONE_DONE() via 'Parent Bone -> Child Bone'
  OBtest/Bone/POSE_IK_SOLVER() via 'IK Solver Result'
Detected 1 dependency cycles

I am not sure if it is a bug because dependency cycles often bring unpredictable results.

This file has a dependency cycle. See console: ``` Dependency cycle detected: OBtest/Bone/POSE_IK_SOLVER() depends on OBtest/Bone.003/BONE_DONE() via 'IK' OBtest/Bone.003/BONE_READY() via 'Ready -> Done' OBtest/Bone.003/BONE_CONSTRAINTS() via 'Constraints -> Ready' OBtest/Bone.002/BONE_DONE() via 'Copy Rotation' OBtest/Bone.002/BONE_READY() via 'Ready -> Done' OBtest/Bone.002/BONE_POSE_PARENT() via 'Pose -> Ready' OBtest/Bone.001/BONE_DONE() via 'Parent Bone -> Child Bone' OBtest/Bone/POSE_IK_SOLVER() via 'IK Solver Result' Detected 1 dependency cycles ``` I am not sure if it is a bug because dependency cycles often bring unpredictable results.

xueke pei commented

2020-03-03 14:49:02 +01:00

Look like This dependency cycle cause this weird behavior, did this kind of constraint is forbid or need other more rig setup to prohibt like this?

Germano Cavalcante commented

2020-03-03 15:01:54 +01:00

I am not familiar with this area.
There is chance it is fake/avoidable dependency cycle.
You can see more details in this report -> #66582

I am not familiar with this area. There is chance it is fake/avoidable dependency cycle. You can see more details in this report -> [#66582 ](https://developer.blender.org/T66582)

Germano Cavalcante commented

2020-03-03 21:11:43 +01:00

Changed status from 'Needs Triage' to: 'Archived'

Germano Cavalcante closed this issue

2020-03-03 21:11:43 +01:00

Germano Cavalcante self-assigned this 2020-03-03 21:11:43 +01:00

Germano Cavalcante commented

2020-03-03 21:11:43 +01:00

I analyzed the rig and the dependency is evident and avoidable.
Bone.002 has as parent Bone.001 and has the Inherit Rotation option enabled.
So Bone.002 copies the rotation of Bone.001
But Bone.001 has a constraint that copies the rotation of Bone.002.

This is bad and should be avoided.

I analyzed the rig and the dependency is evident and avoidable. `Bone.002` has as parent `Bone.001` and has the `Inherit Rotation` option enabled. So `Bone.002` copies the rotation of `Bone.001` But `Bone.001` has a constraint that copies the rotation of `Bone.002`. This is bad and should be avoided.

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IK target add Copy Rotation Constraint cause render animation sequence repeat frist frame no pose change rendered #74390