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Date: Thu, 23 Jun 1994 07:43:16 -0700 (PDT)
From: Darrin Yancey <[e-mail]>
Subject: using Bones
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    Has any one else experienced the problem of uncontrolled stretching
of a figure that is animated by bones?  It gave me quite a headache until I
figured this work around.  Sure you can limit the radius of influence of a bone
but this if difficult to control.  If the objects are close together it may not be
possible to find the radius that controls one piece of a figure while leaving
another alone.

    The trick I found is to break the object into pieces.  For a human figure
there would be head, torso, left & right arm and leg.  They would include the
upper lower and foot/hand.  group the extremities to the torso and move them
to the proper places.  Add bones to each piece to allow the proper motion and
group the bones in a kinematic manner, like hand to forearm to upper arm.
The  whole arm can be moved by moving the parent bone (upper arm).  Since
the bones are 'local' to each extremity they only affect it.  No need to muck
about with radius of influence.