Subject: Re: bones
Date: Mon, 9 May 1994 23:54:30 -0600 (MDT)
From: kholland@polaris.unm.edu (Kiernan Holland)

as Roger Straub said,
<
<The manual for 3.0 says that only the faces assigned to the bone will
<stretch and contort to fit the bone. The faces in between stretch very
<little, if at all. Sorry if I confused anyone.
<
<
<

Is there such a thing as rotating a joint?? I mean, 
say you take an out-stretched arm object (straight) and 
you assign all faces to one bone (upper-arm) and other faces to 
the other bone (lower-arm), when the joint where both bones meet, the elbow,  
is rotated [rotation determined by the relation between both bones] 
does the elbow-faces remain the same as before or do they stretch
about the point of rotation [the joint] to compensate??

If done the first way, I imagine the arm will look like two pieces of metal 
in a tube of rubber that looks like a arm, when bent.

If done the second, I suspect it will look most like a real arm, but not quite..


I think why using dinosaurs as a prototype for demonstration of bones 
is great becuase we aren't used to seeing dinosaurs, especially 
dino-elbows, but in real life a human's arm (what we are all used to, 
except for a few isolated-blind-upper-body-paraplegics) does not 
even do what bones seem to do, simply stretch faces. 

To see what I'm talking about, raise your arm horizontally, bend your 
elbow back and forth several times and you'll notice that the muscles 
and bones move in different directions, so the only way to 
duplicate reality is to study anatomy. Otherwise I think fictional 
characters are good canidates for bones implemented objects.

Kiernan



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