ColinKennedy

07-24-2010, 04:19 AM

In my scene, I have a simple three joint chain arm that I want to have a quadratic curve is bound to. I want to make it so that no matter what angle I bend the elbow joint, the curve will try to maintain its almost semi-circle, quadratic form.

I thought this would be relatively simple but after 2 hours of trying different settings on CV and EP curves and the three point arc tool, let alone the other options I exhausted, I came up with nothing. (By the way, I tried weighting the control vertices to the joints - didn't work).

I found that a normal curve will work about 20% of the time but as soon as I bend the arm to more acute angles, the curve tends to straighten out at the elbow joint.

Does anyone have a solution to keep a curve quadratic while bound to a three joint chain system?

I thought this would be relatively simple but after 2 hours of trying different settings on CV and EP curves and the three point arc tool, let alone the other options I exhausted, I came up with nothing. (By the way, I tried weighting the control vertices to the joints - didn't work).

I found that a normal curve will work about 20% of the time but as soon as I bend the arm to more acute angles, the curve tends to straighten out at the elbow joint.

Does anyone have a solution to keep a curve quadratic while bound to a three joint chain system?