Interpolation issues on properties whose values are not changing

TatsuQ

The version we're using is 4.2.43.
For example, this is the idle animation of our character. The "spine" bone only changes its position, while the "ik-foot-l" & "ik-foot-r" don't change anything though they all have corresponding keyframes in this animation.

However, when I called Skeleton.AnimationState.SetAnimation(...) in Unity to change it into a more exaggerated animation then switching back to this idle one, I found that the transforms of these bones were not correctly set back to the keyed transform, resulting in the character's body being bent.
What can I do to fix this? Thank you for your kindness.

Spinebot

To address the issue of bones not returning to their keyed transforms when switching animations, ensure that all necessary keys are set at the first frame of your animations. This is particularly important when using SkeletonMecanim, as all animated items must be keyed in the first frame to ensure proper pose updates. Additionally, consider using setBonesToSetupPose when switching animations to reset the bones to their setup pose, which can help if keys are missing at frame 0. If you are using SkeletonAnimation, ensure that the AnimationState is correctly applied to the skeleton after setting the animation.

Harald

@TatsuQ Please be sure to disable Animation clean up during skeleton export, or enable Layered on animations which will be played on higher tracks and overrlaid over lower ones. When using SkeletonMecanim with it's additional keys required (see the documentation here), it's likely easiest to just disable Animation clean up.