Sets a new driver joint for the current bone lattice flexor. See Reassign bone lattice flexor joints.
By default, the joint that drives a bone lattice flexor is the child of the bone that the flexor’s influence lattice surrounds. This makes sense for situations such as creating arm bicep muscle effects, where the rotation of the elbow joint drives a bulge deformation around the shoulder joint’s bone. In fact, it makes sense for most of the muscle deformation effects you might want for conventional human characters.
However, you can have the action of the bone lattice flexor be driven by any other joint you wish. The most common situation might be where you want the rotation of the joint whose bone the influence lattice surrounds drive the bone lattice flexor. For instance, for some reason you might want to have the rotation of the shoulder joint drive the bulge around the shoulder joint’s bone. Keep in mind that you can have any joint drive the bone lattice flexor. For instance, you could have the rotation of a finger joint drive a bone lattice flexor around a character’s head.