#IK follow obj. problem
20-Aug-95 11:50:50
Sb: #IK follow obj. problem
Fm: John Mateer [PolyMedia] 100116,343
To: Jonas Ruikis [ADESK] 73172,1351
I have an I problem that is driving me nuts. The scene is simple:
A man walks into a room, picks up a box and puts it up on a shelf.
The box that is carried linked to the left hand — hidden and then unhidden
when the box is picked up (the old trick). I have a dummy object linked to the
box and another linked to the right hand. These align perfectly when the
chracter is bent over to pick up the box. I use the left arm/hand to move the
box around and want the right to follow, staying on the box.
Using "follow object" in IK, the motion looks good until there is any lateral
motion, at which point the shoulder seems to "snap" from one angle limit to the
other (on the Y axis, as if you were turning a screw) — it looks like the snap
that occurs with a camera when it goes directly over the top of a scene. The
box is clearly within reach but the motion is wrong despite all of the motion
limits being set for the objects in the chain. I've tried different joint
precedences and damping but have not found any good combinations. Do you have
any suggestions? Is there a better approach to this?
Any advice would be very helpful. (BTW congrats with MAX — I look forward to
playing with it).
John Mateer
PolyMedia