IK pole vector orientation

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  06 June 2006
IK pole vector orientation

HI,
sorry if this has been covered already, but I can't quite find the answer to my problem. I'm creating a simple 3 joint ik chain (a finger), but have encountered a problem. When setting up the ik handle (rotation plane) for three fingers of the hand, all works as expected. However for two of the fingers, after placing the ik handle, I find that the pole vector for the chain is pointing in the wrong direction (90 degrees to the side, rather than straight up). So, when moving the handle, the chain bends along the wrong axis.

I can translate the pole vector or use the twist control to place it pointing straight up, but of course this rotates the whole chain and messes up the geometry.

So my questions are how can I fix this ik chain so that it behaves properly and why is the pole vector pointing in the wrong direction in the first place?


Thanks very much.
 
  06 June 2006
You probably didn't set the bones prefered angle. This tells the ik solver which axis to rotate.
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  06 June 2006
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