If you take a simplebiped and move the pelvis down, the feet remain stationary, they do not move or rotate. When I add IK myself I can block the movement of the finite bone such as the foot, but I can not lock the rotation http://take.ms/FfzHnf [take.ms] What is responsible for the fact that this bone was locked absolutely?

in the simpleBiped, the foot bone is the child of a blend object
the blend is passing rotations for the foot between the IK and FK - the rotations for the foot don't come from the calf bone but from the IK control itself.

I added a Twist Afector to the last bone http://take.ms/fzdRS [take.ms]

Need to create a Null, place it in front of the bone and in the KIN_Chops indicate this Null for the Twist Afector

This can be done while adding kinematics :-)

when adding kinematics one of the options is to add Inverse kinematics with Twist

Maybe someone will come in handy. In order for the foot to rotate exactly along with the pivot it is necessary also to add in a hierarchy chain_twist. Here's an example http://take.ms/8sTuX [take.ms]

goldfarb
when adding kinematics one of the options is to add Inverse kinematics with Twist

Yes, but I didn't realize it was interconnected. Now for me already a lot has become in the places