One of the more powerful
features of Biped is the ability to retarget or map the motion of
any biped onto any other biped.
If you map the motion
of a biped without a tail onto a biped with a tail, default tail
motion for the biped with a tail will be computed. Default motion
will also be computed when mapping the motion of a biped with fewer
links in the legs, spine, or neck onto a biped with more links in
the legs, spine, or neck. There are a few ways to perform motion
mapping. You can:
- Go into Figure mode and change the structure
of your biped. When you exit Figure mode, the new structure of the
biped will adapt to the existing animation.
- Save a BIP or STP file from one biped,
and load it onto another biped of a different structure and size.
- Copy footsteps from one biped, and paste
them onto the footsteps of a differently structured and scaled biped.
Scale Stride Mode
Scale Stride mode gives
you control over whether or not certain aspects of motion mapping
If Scale Stride mode
is active (the default):
- When you exit Figure mode after loading
a FIG file or changing the biped's leg length, pelvis width, or
height, the locations of the footsteps will be scaled to match the
leg length and pelvis width, and gravity will be changed to match
the new height of the biped.
- When you load a BIP or STP file, the
locations of the footsteps in the file will be scaled to match the
leg length and pelvis width of the existing biped. Gravity will
be adjusted to be proportional to the gravity stored in the file.
(A motion stored in a BIP or STP file has a gravity value associated
- When you paste footsteps copied from
one biped onto another biped, the locations of the footsteps in
the buffer will be scaled to match the leg length and pelvis width
of the existing biped. Gravity will be adjusted to be proportional
to the gravity stored in the file. (A motion stored in a BIP or
STP file has a gravity value associated with it.)
If Scale Stride mode
is not active, no computations will be performed in any of the above
cases. Then you might see your biped moving over footsteps that
are spaced inappropriately far apart or close together for the size
of your biped. Typically, you should leave Scale Stride mode active, unless
you want to maintain the spatial relationship between the biped
and other objects in your scene.
To turn off Scale Stride mode:
- Select the biped, and go
to the Motion
- On the Biped rollout, click the bar at
the bottom to expand the rollout.
(If the rollout is already expanded, the bar
shows a minus sign at the left, instead of a plus.)
- In the Modes group, click (Scale
Stride Mode) to turn it off.
The button changes to indicate stride scaling
has been turned off.
- Use (Figure
Mode) to edit the figure.
When you return to Keyframe mode or Footstep
mode, the biped's stride length is unchanged, regardless of the
biped figure's new proportions.