By default, converting to BlendShapes removes the on-face joints and controllers.
“Keep joints” allows the on-face joints and controllers to be kept.
Keep on-face joints and controllers when converting a face setup to BlendShapes.
This means the face will have both a “SkinCluster” and a “BlendShape” node.
This is the same as choosing “Mixed” as the rig type in the Pre section.
“Mixed” provides the most flexibility and control, but makes the rig significantly slower to work with. To compensate, there is a “FaceCtrls detach” function in the Selector. If using the game-engine option together with “Mixed”, the on-face controllers will not be fully attached to the skin.
