8

Sliding Footstep 1107
See also
Sunlight (p age 3–1112)
Sunlight and Daylight Systems (page 1–394)
Sliding Footstep
In footstep animation (page 3–1037) ,changing
biped foot key parameters enables the biped feet
to move or slide during a footstep period. This
feature is also available for motion-capture file
import to allow the biped feet to slide or pivot. In
the viewpor ts, a sliding footstep is displayed as a
footstep with a line through the middle.
Smoothing Groups
Left: The bottle has no smo othing.
Middle: Smoothing is a ssigned only to t he highlighted
group of faces.
Right: The bott le is smoothed using three different
smoothing groups: on the body, the neck, and the top edge.
Smoothinggroupsdefinewhetherasurfaceis
rendered w ith sharp edges or smooth sur faces.
Smoothinggroupsarenumbersassignedtothe
faces or patches of an object. Each face or patch
can carry any number of smoothing groups up to
the maximum of 32. If two faces or patches share
an edge and share the same smoothing group, they
w i ll render as a s mooth surface. If they don’t share
the same smoothing group, the edge between them
will render as a corner.
You can manually change or animate the threshold
values for smoothing group assignments using
such tools as
Editable P oly (Polygon/Element)
(page 1–1054)
and the Edit Mesh modifier (p age
1–613)
.
SMPTE
SMPTE (Society of Motion Picture and Television
Engineers)isthestandardtimedisplayformatfor
most professional animation work.
From left to right, the SMPTE format displays
minutes, seconds, and f rames, delineated by
colons. For example:2:16:14
represents 2 minutes, 16 seconds, and 14 frames.
As you move through time in a SMPTE display,
when the seconds field increments, the frames f ield
recycles to 0 and starts over. For example, given an
NTSCframerateof30framespersecond,asyou
move through time, the frames field counts from 0
to 29, at which point the seconds field increments
by 1, and the frames field b egins again at 0.
As with the Frames display format, the SMPTE
formatletsthetimeslidermoveatsingle-frame
increments.
Space Warp Behavior
In crowd animation (page 2–1006) ,theSpace
Warp behavior lets you assign a space warp, such
as Wind or Gravity, to one or more delegates.
The Space Warp behavior can use any space warp
in the Forces category. These space warps treat
delegates (page 3–1022) as if they were particles.
You can also use the Space Warp b ehavior to bind
delegates to the
Ve c to r F i e l d sp a c e w a r p provided