8

Motion Capture Utility 637
All—
Assigns all tracks to the Record C ontrols
group.
Inver t—When t racks are selected, assigns the
unselected tracks to the Record Controls Area.
None—AssignsnoneofthetrackstotheRecord
Cont rols group.
By default, each track is provided a name
consisting of the name of the object followed by
a backslash and the name of the parameter. For
example, Sphere01\Angle is an Angle parameter
applied to one of the modifiers assigned to
a sphere. You can rename the tracks in the
Properties dialog, which you can access in Track
View, or by double-clicking the track name in the
Motion Capture utilit y. The upper rollout of each
Properties dialog includes a Track Name field. Any
name entered in the Track Name field appears in
the Track list in the command panel, in the title
bar of the Properties dialog , and beside the Data
track in the Hierarchy list in Track View.
Record Range group
Specifies t he frame range affected by the recording.
Yo u c a n a l s o s e t a
preroll range of frames (see
below).
Preroll—Specifies the frame number where the
animation begins playing when you press the Start
button. If this number is the same or greater than
the In number, the Preroll number is ignored.
For example, if In: 0 and Out: 200, then a Preroll
of -100 would g ive you 100 frames b efore the
recording started, while a Preroll of 50 would be
meaningless. If the range defined by Preroll and
Out is larger than the current segment, the segment
is temporarily enlarged during the recording.
In—Specifies the f rame number where the
recording begins after you click Start.
Out—Specifies the frame number where the
recording ends after you click Start. You can stop
the recording before this by clicking Stop.
Live Dur ing Preroll—When this is active, the
motioncaptureislivethroughtheprerollframes.
The motion o ccurs, but isn’t recorded. This can
cause sudden motion shifts at the In frame b ecause
your live motion m ig ht not match the animation
whenyoureachtheInframe.Whenthisoption
is inactive, the motion is disabled or frozen until
you reach the In frame.
Samples group
When the motion data is captured, it’s sampled
at a rate relative to the current frame rate, which
defaults to 30 frames per second. Increasing the
frame rate increases the sample rate. The two radio
buttons in this section allow you to choose one
or two samples per frame. This is a shortcut that
lets you sample at a field rate. If you’re rendering
to fields, you don’t need to capture at 60 frames
per second. Controllers will interpolate between
the samples.
Reduce Keys—Reduces the keys generated by the
motion capture.
Threshold—ThevalueyouenterintheThreshold
field constrains how 3ds Max changes the selected
track. The difference between the new animation
and the original animation, at any frame, wi l l be
less than the threshold value.