Usually, the face data that I got, has been cleaned and stabilized in vicon blade.
But this time I got a cleaned but not stabilized face data.
I have no idea how to do the cleaned and stabilized job in a proper way.
maybe this http://www.studiodaily.com/2008/12/set-up-a-facial-retarget-in-dcg-facepro/
Finally I figure out a way which works well in MotionBuilder.
Let's see the final result.
The idea is using Rigid Body constrain to get the mainly translation and rotation data to a copy root.
Then clean all the trans info of the root.
stabilized rig(copy from maker data)
mocap system : vicon
software : motionbuilder
Make sure the data is facing Z axis in Mobu.
Pickup the stabilized markers which don't affect by face muscle.
For example: The top of head markers, tip of noes etc...
Set the "Copy:FaceMocap" as Constrained object.
Drag FaceMocap markers, except stabilize ones, onto relation plan as senders. Drag copy one onto relation plan as receivers.
Now connect marker's translation to copy's. And iterate this step to the last one.
Well.. This is kind boring job but just for the first time setup.
(I wrote a simple python script to handle this boring job. Read and download from Here!)
playback they all move in same motion( of cause we duplicated them and use reation)
click Snap on the Right body. playback again the null start moving but not in the center.
Find a facing straight neutral pose then click Zero button.
Right now the null should in the center of the face marker.
Select copy markers and do plot.
Deactivate all constrains
Select copy null and clear it trans info
I've seem a lot people are interested in this article. Sorry for my bad skill of English writing. If you have any questions. Feel free to send me messages.