If using the Avatar Joint Update, the arms of avatars lag behind while rotating using shiftlock.
The place in the video is the Physically Simulated Characters Demo.
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This is expected behavior when using physically simulated limbs. In the demo place, the arm’s AnimationConstraints have IsKinematic disabled, so forces are used to drive the joints instead.
Shift-lock is a non-physical behavior, as it manually adjusts the cframe of your torso. The arms apply a force to “catch-up” to the torso as you spin around, so they appear to lag behind.
Please note that this is not the default behavior of enabling AvatarJointUpgrade, it only acts this way if a developer chooses to disable IsKinematic on the arm’s AnimationConstraints.
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Thank you for clarifying! Shouldn’t shift-lock behavior be made physical using constraints though?
We have no plans to change the current shift-lock behavior as this would be too disruptive to existing games. But we may begin introducing other modes/implementations that can be used.
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