For anyone else who has this issue, here's what the problem was (thanks to Red):

Some of my models had root bones that were associated with vertices.  In the
SMD files, it looked like this:

0 blender_implicit -1
1 root_bone -1
....

After re-rigging and re-animating one of my models so that the root_bone
did not have any vertices attached, all of the ragdoll stretching problems
disappeared :)

Best,
Eric


On Tue, Dec 03, 2013 at 12:07:34PM +0100, fuZZ RedEyes wrote:
> you must to prevent to have some null bones into the skeleton hierarchy,
> often time it comes from a bad habit when you are rigging the hips. ( null
> bones are bone without vertex influence )
> 
> Red
> 
> 
> 2013/11/29 <eric.br...@dnbrown.net>
> 
> > I made some player models in blender, and many of them have problems as
> > ragdolls:  It looks like some of the joints become disconnected, which
> > produces a stretching effect that's a little disturbing.  If I $jointmerge
> > bones together, they will no longer stretch, but I can't do this for the
> > whole model since it would become a single rigid skeleton.
> >
> > Has anyone else had this problem?
> >
> > Any advice would be greatly appreciated--I'm a few weeks away from
> > releasing my mod, and fixing this bug would make a big difference.
> >
> > Thanks,
> >
> > Eric
> >
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> >

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