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Animation is not mirrored when toggling the 'Mirror animation' option in Blend Tree



How to reproduce:
1. Open the attached project
2. Open the 'TestController.controller' in the Animator (by double-clicking on the Asset)
3. Open the Blend Tree
4. Mirror the individual Animation Clips
5. Observe the behavior
6. Mirror the animation in the Blend Tree itself
7. Observe the behavior again

Expected result: Animation is mirrored
Actual result: Animation is not mirrored

Reproducible with: 2019.4.28f1, 2020.3.13f1, 2021.1.13f1, 2021.2.0b1

  1. Resolution Note:

    This is expected behavior. When a clip is mirrored in a blend tree, the clip is also offset to ensure that the footcycle is the same, so that the clip can be properly blended with other clips. In the case of the clip Base_Run01, the clip is symmetrical except for the footcycle, so the mirroring operation seems to not have any effect. To see the effect, try using a clip of a character running and turning at the same time, you will see the turning direction be mirrored, but the footcycle will be the same.

    The documentation will soon be updated to clarify this behavior.

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