1. In 3ds Max and Maya when you create an IK chain for a leg, it's a good idea to have it bent, at least slightly, in the direction you want the knee to bend. And not bent in the other directions.
It looks like, from the unrigged leg, the knee is bowed out. This would result in the behavior you see. Straighten the leg from the front view, and bend it a little from the side view.
2. Maybe you just need a pole vector target, but I think the problem is issue 1.
Replies
1. In 3ds Max and Maya when you create an IK chain for a leg, it's a good idea to have it bent, at least slightly, in the direction you want the knee to bend. And not bent in the other directions.
It looks like, from the unrigged leg, the knee is bowed out. This would result in the behavior you see. Straighten the leg from the front view, and bend it a little from the side view.
2. Maybe you just need a pole vector target, but I think the problem is issue 1.