Vertex assignment is like glue/weight painting - CC4/iC8 has cloth tracking and can be used to temporary glue your character's face vertex positions of from a preset you make identifying and covering the face area; lips, eyes etc so the points gets matched on another character's eyes, lips etc that has a morph.. Your character's eyes, lips nose etc will follow the character's morph you want to copy. Basically the other character will puppet the face shape/morph to your character and when the morph on your character looks good, you'd bake the shape.

Additionally, if your character had the vertex assignment profile, faceware could be developed so that if you make a facial expression, it puppets the vertex points on your character and if you like what you see you'd just bake the Puppet shape into a morph so it can be used without facial mocap. CC4 needs Faceware plugin and making facial morphs for characters can be made rapidly! If soft cloth physics was applied to the character to offer more vertex resolution, this could help create more accurate shapes especially if the mocap software was able to use more vertex control points.

So we have two methods of capturing morphs (could be animated morphs as well)

1. Capture morphs built into any character
2. Facial Mocap - directly controls vertex assignment in real-time

For this to work, vertex assignment preset must be mapped to both the transmitting character and the receiving Character.