A method for creating a computer simulation of an actor having a first foot, a second foot and a body including the steps of planting the first foot as a support foot along a space time-varying path. There is the step of stopping time regarding placement of the first foot. There is the step of changing posture of the first foot while the first foot is planted. There is the step of moving time into the future for the second foot as a lifted foot and changing posture for the lifted foot. An apparatus for creating a computer simulation of an actor having a first foot, a second foot and a body. A software program for creating a computer simulation of an actor having a first foot, a second foot and a body that performs the steps of planting the first foot as a support foot along a space time-varying path.