Found in the Elements folder of the Asset browser, the Skeleton node and Skeleton root assets let you build skeletons that can be exported and used in other 3D software.

Skeleton node assets represent the bones of a skeleton, and must be joined to a Skeleton root to create a skeleton hierarchy. The Skeleton root must be joined to at least one Skeleton node.

When creating a chain of bones, MotionBuilder automatically finds a vector at the middle joint and sets its rotational limits. For best results, always build your skeleton with bent joints.

MotionBuilder can give more precise limits for bent joints than for straight joints. After creating your skeleton, you can view and adjust its limits (see Degrees of Freedom (DOF)).