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Camera Tracker: Object Pinning Rollout 683
Smooth Type group
Straight line average—Causes Move smoothing
to generate a straight line average for each of the
selectedparameters.Thisisusefulwhenyouknow
a parameter is fixed, but don’t know its actual
value. Examples might include field-of-view or
vertical position. Use the c amera matcher to
initi ally estimate the parameter, then construct a
straight line average fit and rematch the remaining
parameters
Low pass f ilter—Causes Move smoothing to
apply a low-pass filter to the selected parameters,
eliminating high-frequency noise.
Smooth amou nt—Implements smoothing using a
Gaussian low-pass fi lter whose width and variance
are controlled by the Smooth Amount spinner.
Increase t his value to i ncrease the smoothing.
Smooth Range group
Controls the range of frames over which the
smoothing will be performed.
Match-Move Range—Applies the smoothing
to the range of animation f rames specified in
the Match Move rollout. This allows you to
break up a match-moving job into several frame
ranges. Use this to isolate and experiment on a
troublesome range of frames, without disturbing
other satisfactory frames.
All Frames—Applies the smoothing to all the
keyframes in the selected parameters.
Rematch Af ter S mooth—Controls whether a
compensating match-move is performed after
the filtering. If this is turned on, the par ameters
that were smoothed are disabled in the Match
rollout and another match-move is performed.
Per forming this rematch again is advised because
it adjusts the other camera parameters to
comp ensate for the smoothing and often results
in a smoother estimation for the unsmoothed
parameters.
Smooth—Performsthemovesmoothingbasedon
the smooth typ e, range, and amount settings. If
this button is disabled, no current match c amer a
is assigned.
Camer a Tr a cker: Object Pinni ng
Rollout
Utilities panel > Utilities rollout > More button > Utilities
dialog > Camera Tracker > Object Pinning rollout
Object Pinning lets you use the 2D image feature
tracking data to directly animate objects in the
3ds Max scene. This is useful for replacing moving
features in the scene with 3D objects when the
movement is approx imately planar. After the
tracking data is c reated you can use this function
to do such things as synchronizing the movement
of 3D objects with feature movements in the
background movie. If the 3D objects directly
cover the background features, they will appear
to replace them. For example, you could take
the video of a juggler juggling balls and replace
theballswith3Dballsoffireorsynchronizethe
movement of an animal’s head with a 3D jaw to
create talk ing animal animations.
Procedure
Ex ample: To create a j uggler j uggling 3D bal ls of fir e:
This assumes you already have a video of a juggler.
Otherwise, find a juggler and a video camera.
1. Loadavideoofajuggler.
2. Create tr acker gizmos to associate with the
juggling balls.
3. U se the Movie Stepper to track the gizmos.
4. Go to Object Pinning and choose the tracker.
5. Under O bject To Pin, associate an object with a
tracker. In this case, create a 3D bal l of fire using
fire or an animated map to generate the fire.