You'll probably need to set the up vector for the knee some distance ahead of the knee - not directly on top of it.
Thanks for the help man, I already tried that and didn't help, what I found so far is this:
I have to manually reset to zero all values in all the joints and locators and goal and up vector........and the error become minimal when I apply the up vector but still does weird things.
NOW the thing I recently found is that my joint chain is set to rotate on the X axis but the locator I constrain using the direction option points to the goal on the Z axis......that is problably the big issue (the jiont chain rotation plane is the X but the Ik rotates on Z), I been trying to constrain leaving the X axis pointing to the goal but so far I failed.
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Thanks for the help man, I already tried that and didn't help, what I found so far is this:
I have to manually reset to zero all values in all the joints and locators and goal and up vector........and the error become minimal when I apply the up vector but still does weird things.
NOW the thing I recently found is that my joint chain is set to rotate on the X axis but the locator I constrain using the direction option points to the goal on the Z axis......that is problably the big issue (the jiont chain rotation plane is the X but the Ik rotates on Z), I been trying to constrain leaving the X axis pointing to the goal but so far I failed.
Please help?