Animate the first knee bend:You'll start by animating the knee-bending motion. Dr. X will start the knee
bend in his current stance with arms outstretched, and perform a total of four
squats. When completed, he'll return to his original stance.When the feet are planted, you animate the knees bending by moving the
biped's center of mass up and down.1 Make sure the time slider is at frame 0.2 In the Track Selection rollout, click Body Vertical.
This selects the center of mass's body vertical track.3 Turn on Auto Key.4 Move the center of mass (COM) downward slightly to make the character's
knees bend a little bit.This places a key for the center of mass's body vertical track at frame 0.5 Right-click the Front viewport to activate it, and move the time slider to
frame 15.6 Move the COM down about –0.25m on the Z-axis.686 | Chapter 5 Character-Animation Tutorials