The title is explicit…
Do you know this site? http://kokcito.tk/rvk/ipo.html
If no, read it and come back later
Much later (at least look at the images ! :p)
And now the question.
Are the new Mesh Deform modifier and Transformation constraint suitable for the challenge?
Using Mesh Deform to simplify the weighting (weight the simple mesh instead of bleeding from the eyes for squinting too much on dense mesh) and Transformation on some strategically placed bones to achieve this result :
http://kokcito.tk/rvk/before.jpg ----> http://kokcito.tk/rvk/after.jpg
I tried myself but the Transformation constraint is puzzling me. Especially for scaling… And I have a hard time making the link between the number I input for the source and those I input for the destination