The biped user interface is split up into "modes" of operation. There are three modes available: Figure mode, Footstep mode and Motion Flow mode. You activate these modes by selecting the appropriate button in the General rollout of Motion Panel, which are visible when a biped is selected.
Figure mode is used to change the biped skeletal structure and to align the biped to a mesh.
Footstep mode is used to create and edit footstep animation.
Motion Flow mode is used to create scripts that combine motion files into longer animation.
As with other parts of 3DS MAX, the rollouts change depending on the mode the software is in. When no modes are active, the following rollouts are displayed:
IK Key Info
Sometimes a rollout is displayed, but the controls are unavailable. For example, the Structure rollout controls are only available when Figure mode is active. Similarly in Footstep mode, Footstep Operations are unavailable until you have created some footsteps.
In Figure mode the rollouts displayed are: Track Selection, Keyframing, Display and Structure.
In Footstep Mode the rollouts displayed are: Track Selection, Footstep Creation, Footstep Operations, Display and Animation Properties.
In Motion Flow mode the rollouts displayed are Motion Flow, Motion Flow Script, Track Selection, Display and Structure.
When no modes are active, you can edit tracks and keys, set IK constraints, work with layers and work with motion capture data. You can also create freeform animation without any of the modes active, simply by turning on the Animate button, and then moving or rotating any part of the biped.