View Full Version : stretchy IK sans distance dimension node

07 July 2005, 09:23 PM
So Im trying to script out a version of stretchy ik using a
null that is snapped and parented to the ik handle, with another null
parented beneath it but point constrained to the first joint in the ik chain.

I find that using the dist dimension node periodically confuses the iksolver as it is evaluting the distance, which Im not sure if it is a bug in maya 5 or not.

I am reading this "X" trans value of the 2nd null into the place where the
distance atttribute from a distance dimension node would normally be inserted
(into the multiplyDivide1 node's input1Y node)

upon execution, I get the following errors:

// Warning: Cycle on 'multiplyDivide3.outputY' may not evaluate as expected.
(Use 'cycleCheck -e off' to disable this warning.) //

// Warning: Cycle on 'ikchainNameJALf_1.scaleX' may not evaluate as expected.
(Use 'cycleCheck -e off' to disable this warning.) //

the rest of the network is identical to the generic stretchyIK tutorial that is
floating out there.

any ideas?

07 July 2005, 09:04 AM
don't worry dude, you can ignore the warning as long as you don't spot something wrong graphically. That warning is kind of a standard one you get while using constraints (at least I do when I use them sometimes)......Though I dare say, grouping the last null under the last joint of the IK chain and THEN using the distance dimension node on them would be a better idea than using a contraint....see if this helps.

07 July 2005, 06:56 PM
I go through a line-by-line explanation of a script that creates a stretchy IK with nothing but utility nodes (no distance dimension). You can find it in my book The Art of Rigging.

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07 July 2005, 06:56 PM
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