ND's "Last Of Us" wrist rig from GDC '13 - what is that?

Rigging
1

at GDC this past year, judd simantov presented how ND modeled and rigged their characters. at ~17 minutes in he shows how they used 3 fixup joints in the wrist to preserve volume…

http://www.youtube.com/watch?feature=player_detailpage&v=myZcUvU8YWc#t=1005


he explains that as the wrist moves into one of three “cone readers” a value is output to drive these joints’ rotation.

does anyone know how this type of thing is setup?

2

There was a thread with discussion about these recently:

The ‘cone reader’ is really just a reliable way of comparing two rotation vectors (i.e. a dot product) remapped so that the value will falloff to 0 at a certain threshold. That threshold value defines the outer edge of the cone.

3

crud - TAO forum search failed me.

thanks for the pointer.