EnigmA Amiga Run 1995 November/EnigmA AMIGA RUN 02 (1995)(G.R. Edizioni)(IT)[!][issue 1995-11][Skylink CD].iso/earcd/docs/lwml9505.lha/LWML9505.TXT/[e-mail]_Thu May 18 11:08:36 1995.msg

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Date: 18 May 95 14:10:01 EDT
From: "Bruce G. Considine" <[e-mail]>
To: <[e-mail]>
Subject: IK anyone?
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Steve Soltz responded
>>>>In any case you should have no problem pivoting the hand without the rest
of the IK hierarchy.

    My LW character consists of multiple objects in a heirarchy.  The hips are
at the top, (there are also nulls for extra control higher than the hips).
Below the hips are the legs and the torso, below the torso are the upper arms,
then the lower arms, then the hands.  I made a target null for a hand, I wanted
to use IK to have the character move its arm so that the hand went to the face.
When I started moving the target null not only the hand and arm moved, but the
whole body pivoted.  IK was pivoting the joints higher in the heirarchy than I
wanted.  The only way to limit this currently seems to be to turn of all the
rotation buttons for those higher objects.  Depending on what's being done and
the construction of a character, I think this could result in a lot of button
pushing.
    It would be nice to be able to not only have a goal object, but to
pick an anchor or a terminating object in the chain so that IK would then only
function on the objects in between.  Then you could have one IK chain for each
arm, one for each leg and foot. etc...
    Has anyone doing LW character animation used IK in its current form?  Any
comments?  Can anyone comment on how other packages execute IK?  Although I
have been doing character animation with LW comming up on three quarters
of a year now, this is my first brush with IK.  I haven't yet spent a lot of
time working with IK.

Thanks, Bruce

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