8

876 Chapter 14: Character Studio
• Active Time Segment—Sets the t ime to filter
to be the scene active time segment. You set
theactivetimesegmentinthe3dsMaxTime
Configuration dialog.
•
Fr o m / To: —Sets the time to filter to a custom
range of frames.
Filters group
Filters list—Choose the fi lter to use from this
drop-down list.
The available filter types include smoothing,
blurring, boosting, key reduction, and subanims.
• Rot filtersworkinquaternionrotationspace,
and modify the quaternions of the specified
animation tracks.
• Pos filters work in the specified positional
coordinate system, and mo dify the positions of
the animation tracks.
•
Blurring—Uses basic Gaussian filters that take
a weighted average over the width. Blurring
filters are good for smoothing out noise, but
canalsoover-smoothareasthataren’tnoisy.
See
Blurring, Smoothing, and Boosting
parameters (page 2–877)
,below.
• Smo oth i n g filters, on the other hand, are
much better than blurring filters for keeping
the general shape of the t r ack or curve. T hey
affect only areas that have big changes. The
drawbackofthesmoothingfiltersisthatthey
don’t change the curve as dramatically as the
blurring filters do, so sometimes you’ll need
to run the smoothing filter multiple times to
smooth out a particularly noisy area.
• Adv Rot Smoothing works even bet ter than
the norma l angular smoothing filter when it
comes to modifying only large changes and not
small ones.
See
Blurring, Smoothing, and Boosting
parameters (p age 2–877)
.
(There is no comparable “advanced position”
fixerorfilter.)
•
B oosting—Boosting filters are the opposite
of blurr ing filters. They increase, rather than
decrease, changes in the track. Boosti ng filters
are helpful if you want to make a track have
more exaggeration or a little more jerkiness.
See
Blurring, Smoothing, and Boosting
parameters (page 2–877)
.
•
Sub Anims—The Sub Anims filter manages
sub-animation of biped objects. Clicking
a button that corresponds to a transform
(Position, Rotation, or Scale) displays a
dialog that lets you assign a controller to that
transform. Assigning a controller in this way
assigns it only to the selected biped parts. This
is very handy for adding controllers to multiple
biped parts all at once. Also includes the ability
toenableordisablethethreelistcontrollers
selectively,andavoidscreatingSubAnims,
where they already exist.
See
Sub Anim par ameters (page 2–877) .
•
K ey Redu cer —Creates t r acks with fewer keys,
by removing certain keys based on tolerance
and key spacing parameters. This works
similarlytohowkeyreductionworksduring
motion-capture import.
See
Key Reducer parameters (page 2–877) .
•
Knee Wobble —Corrects knees that wobble or
shakewhenafootisplanted. Ifthekneeis
determined to wobble by the filter, the center of
mass object is adjusted to eliminate the wobble.
•
Knee Extension—Corrects knees that
overextend when a foot is planted. If the knee
extension is identified by the filter, the center
of mass object is adjusted to eliminate the
extension.