Richard60 posted at 2:42 PM Thu, 14 November 2024 - #4491350

IK is one of those things that is best to use or not use.  If you use it start from the beginning and move the hand which will move the rest of the arm.  What it appears you have done is posed the figure then turned on IK and the hand is still set to it's default position and it jumped back there and since it is an impossible move the rest of the arm distorts.  If you set the figure to default pose and then tried to move the hand to in front of the chest without changing the bend angles of the wrist you end up with weird angles.  IK for the feet are easier since the foot almost always faces forward. The hand will change direction simply by moving it.  IK for the arms is best used when the hands are constrained to another object, such as a steering wheel.  That way the hands move a bit and the arms follow without as much distortion.  

The question is why do you need to have IK on the hands on?

IF you are doing an animation and want to use IK for the hands it is best if you set the Keyframes to Linear as that will prevent overshoot that occurs when there are several keys and they are not symmetrical. 

Thank you.I'm trying to make an animation that the arm move backwards first then move forward to touch a still rock.I want to use IK when the hand  is supported on the rock.Now I cannot get what I want,should I change all the other body parts Keyframes to Linear?