Right-click anywhere in the Footstep track in Track View to display the Footstep Mode dialog. This is a modeless dialog and can remain visible while you continue to work in Track View.
This dialog allows you to:
Control the duration information displayed with the footsteps.
Create a freeform period between footsteps.
Select the right or left edges of footstep blocks or the whole block.
To create a freeform period
In Track View, right-click the footstep track to display the Footstep Mode dialog.
Choose Edit Free Form.
In the footstep track, the footsteps become narrow, and most numerical information for the footsteps is hidden. Outlines of yellow boxes appear between footsteps in the airborne periods to indicate potential freeform areas.
Click a yellow box.
The box turns to a solid yellow color, showing that freeform editing is in effect in that area. Click the box again, and the box becomes hollow, showing that dynamics are again active in that area.
At the moment when you set a freeform area, the vertical keys are maintained but the interpolation becomes spline interpolation. At the moment when you unset a freeform area, the vertical keys are recomputed based on vertical dynamics.
Tip: If you want to start working on a freeform area using the vertical positions computed with dynamics, then set some vertical keys to record some vertical positions before making the area a freeform area.
Note: Freeform periods during a footstep animation can occur only between footsteps. Biped does not allow you to begin or end an animation with the biped in midair. To create an animation that begins with the biped in mid-air, start the biped on a footstep, but begin rendering from a frame in the mid-air period.
To create a purely freeform animation in Biped
Create a biped.
Move a biped limb.
Answer Yes to the message asking if you want to create a purely freeform animation (without footsteps).
Note: Once you initiate a freeform animation, you cannot add footsteps to it in Footstep mode. You can, however, convert your freeform animation to a footstep animation using Convert on the General rollout.
Edit Footsteps: In this mode (which is the default), you can edit the biped's footsteps to change their duration; start and end frames; airborne duration; and so on.
Edit Free Form (no physics): In this mode, you can edit the biped's body keys for the frames at which the biped is airborne.
Free Form suspends the physically based dynamics that normally control biped motion. This is essential when you want to make the biped fly, or sit down, or fall over. Note that the freeform period must be between footsteps.
The freeform area appears as a yellow block between the footsteps.
Footstep Number Display group
The footstep blocks can have any one of four time settings displayed for them. You can only show one of these at a time.
The footstep step number is always displayed on the footstep blocks (in boldface).
Start and End Frame: Displays the start and end frames of the footstep (from Touch to Lift). Biped displays just the start frame if the footstep block is too small to show both. Zoom in to see both start and end numbers.
Both footsteps 0 and 1 begin at frame 0 and end at frame 19.
Start Frame: Displays just the start frame number (Touch).
Both footsteps 0 and 1 begin at frame 0.
Duration: Displays the number of frames that the foot is in contact with the ground (from Touch to Lift).
Both footsteps 0 and 1 are in contact with the ground for 20 frames.
Double Support: Displays the number of overlapping frames in which both feet are in contact with the ground.
You can also turn on the following two numbers for the intervals between the footsteps. You can display both numbers at the same time by selecting both boxes.
Footsteps 0 and 1 share a double-support period of 20 frames.
No Support: Displays the number of frames that the whole biped is airborne; that is, the frames in which neither of the feet have any contact with the ground.
The no-support period between frames 3 and 4 and 4 and 5 is 12 frames.
Foot Air Duration: Displays the number of frames that each foot has no contact with the ground.
The foot air duration for the left footstep track between frames 3 and 5 is 31 frames.