Incorrect baking animation. #71068

New Issue

Yuriy · 2019-10-24T11:34:03+02:00

Yuriy commented

2019-10-24 11:34:03 +02:00

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449

Short description of error
Incorrect baking animation. Please see the gif animation.

Made rigify skeleton animation. If you bake the animation, then it does not work correctly. Bake settings: Only Selected Bones, Visual Keying, Clear Constraints, Bake Data - Pose.
In the second example, a skeleton is made that repeats the transformations of the deforming bones rigify. Baking animations for a repeating skeleton also does not work correctly. (gif)
I think the problem is in the wrong Scale. If bones of a skeleton with baked animation disable Inherit Scale, then the animation looks better, but still not true.
If you export the skeleton to fbx format, the animation will be incorrect and will not work correctly in game engines.
Met similar problem on Unrial Engine forums.
https://forums.unrealengine.com/development-discussion/animation/93483-solved-blender-to-ue4-squash-and-stretch-bone-heirarchy-scaling
bake_animation.blend

Exact steps for others to reproduce the error
simple_rig.blend

open attached file (simple_rig.blend);
select the original object and go to pose mode;
run the animation to see the desired result;
select all bones or just the foot bone;
in the view3d header, go to Pose -> Animation -> Bake Action;
in the menu select the options: Only Selected Bones, Visual Keying, Clear Constraints, Bake Data - Pose.
confirm and observe the resulting animation.

**Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` **Short description of error** Incorrect baking animation. Please see the gif animation.![example01.gif](https://archive.blender.org/developer/F7853500/example01.gif) Made rigify skeleton animation. If you bake the animation, then it does not work correctly. Bake settings: Only Selected Bones, Visual Keying, Clear Constraints, Bake Data - Pose. In the second example, a skeleton is made that repeats the transformations of the deforming bones rigify. Baking animations for a repeating skeleton also does not work correctly. (gif) ![example02.gif](https://archive.blender.org/developer/F7853526/example02.gif) I think the problem is in the wrong Scale. If bones of a skeleton with baked animation disable Inherit Scale, then the animation looks better, but still not true. If you export the skeleton to fbx format, the animation will be incorrect and will not work correctly in game engines. Met similar problem on Unrial Engine forums. https://forums.unrealengine.com/development-discussion/animation/93483-solved-blender-to-ue4-squash-and-stretch-bone-heirarchy-scaling [bake_animation.blend](https://archive.blender.org/developer/F7853578/bake_animation.blend) **Exact steps for others to reproduce the error** ![example03.gif](https://archive.blender.org/developer/F7865029/example03.gif) [simple_rig.blend](https://archive.blender.org/developer/F7865031/simple_rig.blend) - open attached file (simple_rig.blend); - select the original object and go to pose mode; - run the animation to see the desired result; - select all bones or just the foot bone; - in the view3d header, go to `Pose -> Animation -> Bake Action`; - in the menu select the options: `Only Selected Bones, Visual Keying, Clear Constraints, Bake Data - Pose`. - confirm and observe the resulting animation.

Yuriy commented

2019-10-24 11:34:03 +02:00

Added subscriber: @YuraKharitonow

Yuriy commented

2019-10-28 11:53:01 +01:00

And a simple rig. Pay attention to the foot. simple_rig.blend

And a simple rig. Pay attention to the foot. ![example03.gif](https://archive.blender.org/developer/F7865029/example03.gif) [simple_rig.blend](https://archive.blender.org/developer/F7865031/simple_rig.blend)

Yuriy commented

2019-11-07 11:07:07 +01:00

This is very important for animators working in gamedev. With improper baking animations, you can not do good squashing and stretching.

Germano Cavalcante commented

2019-11-08 16:38:53 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2019-11-08 16:38:53 +01:00

Opening your file and seeing the console, I realized that armature has cyclic dependencies:

Read blend: C:\Users\GERMANO\Downloads\simple_rig.blend
Dependency cycle detected:
  OBArmature/Bone.001/BONE_CONSTRAINTS() depends on
  OBArmature/Bone.002/BONE_DONE() via 'Stretch To'
  OBArmature/Bone.002/BONE_READY() via 'Ready -> Done'
  OBArmature/Bone.002/BONE_CONSTRAINTS() via 'Constraints -> Ready'
  OBArmature/Bone.002/BONE_POSE_PARENT() via 'Pose -> Constraints Stack'
  OBArmature/Bone.001/BONE_DONE() via 'Parent Bone -> Child Bone'
  OBArmature/Bone.001/BONE_READY() via 'Ready -> Done'
  OBArmature/Bone.001/BONE_CONSTRAINTS() via 'Constraints -> Ready'
Detected 1 dependency cycles

This happens when the transformation of bone1 depends on the transformation of bone2 and the transformation of bone 2 depends on the transformation of bone1 or something related.

Cyclic dependencies sometimes bring unpredictable results.

I think this report could be closed, but I'll wait a second opnion.

Opening your file and seeing the console, I realized that armature has cyclic dependencies: ``` Read blend: C:\Users\GERMANO\Downloads\simple_rig.blend Dependency cycle detected: OBArmature/Bone.001/BONE_CONSTRAINTS() depends on OBArmature/Bone.002/BONE_DONE() via 'Stretch To' OBArmature/Bone.002/BONE_READY() via 'Ready -> Done' OBArmature/Bone.002/BONE_CONSTRAINTS() via 'Constraints -> Ready' OBArmature/Bone.002/BONE_POSE_PARENT() via 'Pose -> Constraints Stack' OBArmature/Bone.001/BONE_DONE() via 'Parent Bone -> Child Bone' OBArmature/Bone.001/BONE_READY() via 'Ready -> Done' OBArmature/Bone.001/BONE_CONSTRAINTS() via 'Constraints -> Ready' Detected 1 dependency cycles ``` This happens when the transformation of bone1 depends on the transformation of bone2 and the transformation of bone 2 depends on the transformation of bone1 or something related. Cyclic dependencies sometimes bring unpredictable results. I think this report could be closed, but I'll wait a second opnion.

Yuriy commented

2019-11-09 14:36:53 +01:00

Short description:
If I see that the bone stands in place at coordinates 0.0.0, then after baking the visual keys, I should see that the bone stands in place at coordinates 0.0.0
more details:

Bone is the parent for Bone.001. And bone Bone.001 is the parent for Bone.002. If a coordinate transformation occurs at Bone.001, then Bone.002 inherits these transformations.
Bone.002 has constraint Copy Transforms. Bone.002 copies the bone transformation of Bone.003. Bone.003 is at rest, and the bone of Bone.002 is also at rest, no matter how the transformation of its bone of the parent Bone.001 changes.
Expectation: after baking visual keys, the animation will be the same as with rig.
In fact: after baking visual keys, the Bone.002 bone has its own transformation keys, and also inherits the transformation from the parent’s bone. Animation does not look the same as with rig.
Perhaps you need to change the algorithm for baking visual keys so that the bones take into account the transformation of the parents.

**Short description:** If I see that the bone stands in place at coordinates 0.0.0, then after baking the visual keys, I should see that the bone stands in place at coordinates 0.0.0 **more details:** ![screen.PNG](https://archive.blender.org/developer/F8003191/screen.PNG) Bone is the parent for Bone.001. And bone Bone.001 is the parent for Bone.002. If a coordinate transformation occurs at Bone.001, then Bone.002 inherits these transformations. Bone.002 has constraint Copy Transforms. Bone.002 copies the bone transformation of Bone.003. Bone.003 is at rest, and the bone of Bone.002 is also at rest, no matter how the transformation of its bone of the parent Bone.001 changes. **Expectation:** after baking visual keys, the animation will be the same as with rig. **In fact:** after baking visual keys, the Bone.002 bone has its own transformation keys, and also inherits the transformation from the parent’s bone. Animation does not look the same as with rig. Perhaps you need to change the algorithm for baking visual keys so that the bones take into account the transformation of the parents.

Yuriy commented

2019-11-09 14:43:19 +01:00

If I want to make a flexible back and limbs, then after baking visual keys, the animation does not look right.

This is UE4Skeleton. It repeats the transformation of the deforming bone rigify.
Expectation: visually the back is bent, everything works correctly. After baking visual keys, the animation looks exactly the same.
In fact: After baking visual keys, the animation does not look right.

If I want to make a flexible back and limbs, then after baking visual keys, the animation does not look right. ![spine.gif](https://archive.blender.org/developer/F8003294/spine.gif) This is UE4Skeleton. It repeats the transformation of the deforming bone rigify. Expectation: visually the back is bent, everything works correctly. After baking visual keys, the animation looks exactly the same. In fact: After baking visual keys, the animation does not look right.

Yuriy commented

2019-11-12 12:26:44 +01:00

Here is an example with a repeating transformation rig. Animation is baked incorrectly.

simple_rig_repeating.blend

Here is an example with a repeating transformation rig. Animation is baked incorrectly. ![example04.gif](https://archive.blender.org/developer/F8046915/example04.gif) [simple_rig_repeating.blend](https://archive.blender.org/developer/F8046928/simple_rig_repeating.blend)

Germano Cavalcante commented

2019-11-12 13:26:59 +01:00

This example also has a cyclic dependency.
And this is something the user has to avoid.

This example also has a cyclic dependency. And this is something the user has to avoid.

Yuriy commented

2019-11-12 15:15:49 +01:00

Can't bake an animation based on cyclic dependencies? Perhaps using a new algorithm?
I understand that the animation is well baked if the bones do not have a parent with each other. But in the skeleton of a game, the spine, arms and legs must be connected.
For example, in a gif animation, a character is shown in UE4, in which the spine is squashed and stretched. How to bake a similar animation in Blender?

Maybe here Scale inheritance from parents in UE4 is simply disabled.
source https://youtu.be/tWVZ6KO4lRs?t=645

Can't bake an animation based on cyclic dependencies? Perhaps using a new algorithm? I understand that the animation is well baked if the bones do not have a parent with each other. But in the skeleton of a game, the spine, arms and legs must be connected. For example, in a gif animation, a character is shown in UE4, in which the spine is squashed and stretched. How to bake a similar animation in Blender? ![fortnite.gif](https://archive.blender.org/developer/F8048444/fortnite.gif) Maybe here Scale inheritance from parents in UE4 is simply disabled. source https://youtu.be/tWVZ6KO4lRs?t=645

Yuriy commented

2019-11-13 10:35:16 +01:00

I tried to make animation without constraints. Just manually change the scale and rotation. It is not possible to achieve the desired result. Probably you can’t do without disabling scale inheritance.

I tried to make animation without constraints. Just manually change the scale and rotation. It is not possible to achieve the desired result. Probably you can’t do without disabling scale inheritance. ![manual.gif](https://archive.blender.org/developer/F8058060/manual.gif)

Sybren A. Stüvel commented

2020-01-20 11:24:12 +01:00

Added subscriber: @dr.sybren

Sybren A. Stüvel commented

2020-01-20 11:24:12 +01:00

Changed status from 'Confirmed' to: 'Archived'

Sybren A. Stüvel closed this issue

2020-01-20 11:24:12 +01:00

Sybren A. Stüvel self-assigned this 2020-01-20 11:24:12 +01:00

Sybren A. Stüvel commented

2020-01-20 11:24:12 +01:00

I'm closing this issue as it's about the result of a cyclic dependency, which is not supported. If the problem also occurs in a supported situation, please file a new bug report.

Xury Greer commented

2020-04-14 05:06:22 +02:00

Added subscriber: @Xury46

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Incorrect baking animation. #71068