Select the biped. > Motion panel > Display rollout
Using controls on the Display rollout on the Motion panel, you turn on or off the display of biped, bones, footsteps, footstep numbers, and trajectories. You can also change footstep colors and set the number of bipeds you want to play back.
To display footsteps
Select a biped that has footstep animation.
On the Display rollout turn on Footsteps.
Footsteps will display in the viewports.
Note: If a biped has only freeform animation or no animation, no footsteps will appear.
Bones: Displays biped bones. Bones are represented as the color of the corresponding links, which do not render. Selecting Bones is useful for seeing exactly where the joints fall in relation to the biped objects.
Objects: Displays biped body objects; these will render if you do not select Hide before rendering. Hide the biped objects before scene rendering. You can also hide individual body objects by using the standard 3DS MAX Hide controls found in the Display panel and Display Floater.
Footsteps: Displays biped footsteps in the viewport. Footsteps are represented as green and blue foot-shaped outlines by default; these are also visible in preview renderings. Turning off the Footsteps button also turns off the footstep numbers and the center of mass shadow (the disc between the biped feet).
Footstep Numbers: Displays biped footstep numbers. Footstep numbers specify the order in which the biped will move along the path created by the footsteps. Footstep numbers are displayed in white and do not render, but do appear in preview renderings.
Trajectories: Displays trajectories for selected biped limbs.
You can edit keys on the bipeds horizontal and vertical track by turning on Trajectories, turning on Sub-Object, selecting the horizontal or vertical center of mass track and transforming keys in the viewports. Use Trajectories when editing keyframe parameters to visualize their influence, and to compare raw and filtered motion capture data.
Display Preferences: Displays the Display Preferences dialog which is used to change footstep colors, trajectory parameters, and to set the number of bipeds to be played back when you use Biped Playback on the General rollout. Footstep color preference is a good way to distinguish between the footsteps of two or more bipeds in a scene.