Regarding the transfer of pixel aspect in Massive for the version I last
used I don't think it can come thru a CAM file. I believe it's only set
directly in the .mas scene file.
The skeleton in Massive is actually quite similiar to the way Maya skeletons
work. It's basically just a hierarchy of transforms (without an extra IK
root or effector). Not sure what Motionbuilder does but XSI really dirties
up the ASF hierarchy too by adding a bunch of dummy roots and effectors that
are very unfriendly to getting clean AMC data back out.
The way around it in XSI was to build a clean version of the ASF hierarchy
using only nulls and constrain them to a generic biped rig to plot out.
