8
Sliding Footsteps 915
At this point, you can use Convert
From Buffer to extract footsteps and reduce
keyframes. Both scale and position adjustments
will be incorporated. Save the motion as an
optimized
.bip
file.
Sliding Footsteps
Motion-capture and marker data typically have
keys at every frame. Filtering motion-capture
data reduces keys, making the job of altering or
personalizing the motion data much simpler.
You can create your ow n library of imported and
optimized motion-capture data by saving .
bip
files for use with other characters or as part of a
longer script in Motion Flow mode. Use a biped
that has no mesh attached to it with Physique. You
import the data, adjust it to your li king, and save it
as a .
bip
file. You can also run standard .
bip
files
throughthisfilteringprocesstocreateloopsorto
extract footsteps from a freeform animation.
Mo ti on Cap tur e Imp ort
Footstep motion capture is enabled automatically
when importing motion capture data using the
Sliding Tolerance and Sliding Ang le controls in the
Motion Capture Conversion Parameters dialog
(page 2–922)
.
Footstep Extraction group
The following options are active when Footstep
Extraction is on during motion capture
conv ersion.
Ex traction Tolerance—Sets the sensitiv ity of
footstep extraction. character studio determines
if the footstep is there by check ing that the foot
does not move beyond the distance determined by
the Extraction Tolerance value. Smaller numbers
are more sensitive and extrac t more footsteps. The
value is a percentage of foot length.
The default value is 0.15. Increase this value to 0.2
or 0.25 if too many footsteps are generated.
Sliding Distance—Creates a
sliding footstep (page
2–915)
when positional tolerance is reached. This
value is a percentage of foot length. By default the
foot must slide its ow n distance (100), before a
sliding footstep is created.
Use this with motion-capture files that contain
sliding feet. A sliding footstep can be created
manually by setting IK Blend > 0 for a biped foot
at a "touch" state key (biped foot first touches a
footstep).
Note: Sliding footsteps display as a footstep with a
line through the center.
Sliding Angle—Creates a
sliding footstep (page
2–915)
when rotational tolerance is reached. This
value is in degrees. The default is set high (360
degrees),thefootmustmakeacompleteturn
before a sliding footstep is created.
Use this with motion-capture files that contain feet
that pivot, as in a dance mot ion.
Note: Sliding footsteps display as a footstep with a
line through the center.
Only Ex tr act Footsteps W ithin Tolerance—Turns
on Z -axis Tolerance. These controls filter out
footsteps that do not fall within a given range of
the ground plane. Use this when fi ltering motions,
such as hopping or pitching a baseball, in which
a foot might come off the ground and remain
stationary, but its position is not intended as a
footstep.
•
Tolerance—Valueisapercentageofleglength.
•
From Z Level —Set a Z value (ground).
Flatten Footsteps to Z=0—Moves extracted
footsteps to Z =0. Use this to flatten out minor
differences in the height of the extracted footsteps.