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toe roll and leg IK


jim c

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I'm trying to add some toe roll to my IK leg. I currently have a reverse foot set up using nulls. What I'd like to have happen is as the foot rolls down, causing the IK ratio of IK sovled length vs orginal bone length to go over 1

post-4235-0-34293000-1371263597_thumb.jp

is to have the null that controlls that ball of the foot rotate on X like this

post-4235-0-79959600-1371263610_thumb.jp

and then as the foot rolls back up and the IK ratio drops below 1, it goes back to normal.

post-4235-0-79365900-1371263604_thumb.jp

I can figure out the ratio in chops. But I can't figure out how to drive the rotation of the ball of the foot. Is there some alternate way to do this?

Edited by jim c
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