![]() The surface based setup had several advantages: first, it easily defines regions for each joint to move in, making the rig easier to use second, since the joints slide along surfaces, it creates the appearance of flesh sliding over bone - incredibly useful for the face. Essentially, the controls just pipe their translate X and Y channels - after a multiplier is applied - into a follicle's U and V parameters, and each follicle drives a joint.
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