Bidirectional Motion Transfer

Bidirectional motion transfer is an authoring workflow that lets you transfer existing motion onto active constraints, and inversely, transfer the motion from active constraints back to the original motion source while preserving visual fidelity of the motion.

This workflow makes use of the Animation Window to select the desired clip and preview the constrained result in the Scene View.

Both “Transfer motion to skeleton” and “Transfer motion to constraint” are available as options on the constraint components. You should use either the Rig component to Transfer motion of an entire Rig, or the RigBuilder component to transfer motion of the entire hierarchy.

Bidirectional motion transfer can be used on generic character hierarchies. Humanoid is not supported at the moment.

Not all constraints can Transfer motion to constraints. Physics-based constraints like Damped Transform cannot be inferred from existing motion.

Other constraints can be transferred but with limitations. For example, the Twist Chain constraint constrains rotations. It overrides positions and in-between chain rotations. The result of transferring motion does not precisely represent the source animation.

The following constraints support "Transfer motion to constraint" with limitations:

Constraint	Limitations
Two Bone IK Constraint	No limitations.
Multi-Aim Constraint	Roll-Axis motion is not guaranteed to be the same.
Multi-Parent Constraint	No limitations.
Multi-Position Constraint	Disabling constrained axes may change end result
Multi-Referential Constraint	No limitations.
Multi-Rotation Constraint	Disabling constrained axes may change end result.
Twist Chain Constraint	In-between chain transforms are overridden.