8

Camera Tracker: Object Pinning Rollout 661
Smooth—
Performsthemovesmoothingbasedon
the smooth type, range, and amount settings. If
this button is disabled, no current match camera
is assig ned.
Camer a Tra cker : Obj ect Pi nning
Rollout
Utilities panel > Utilities rollout > More button > Utilities
dialog > Camera Tracker > Object Pinning rollout
Object Pinning lets you use the 2 D 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
movements is approximately planar. After the
tracking data is created you can use this function
to do such things as synchronizing the movement
of3Dobjectswithfeaturemovementsinthe
backgroundmovie.Ifthe3Dobjectsaredirectly
covering the background features, they will appear
to replace them. For example you could take
the video of a juggler juggling balls and replace
the balls with 3D balls of fire or synchronize the
movement of an animals head with a 3D jaw to
create talk ing animal animations.
Procedure
Ex am pl e: To crea te a ju ggl er ju ggl i ng 3D b a ll s of f ir e :
1.
Load a video of a juggler. (This assumes you
have a video of a juggler. Otherwise find a
juggler and a video camera).
2. Create tracker gizmos to associate w ith the
juggling balls.
3. UsetheMovieSteppertotrackthegizmos.
4. Go to Object Pinning and choose the tracker.
5. Under Object to pin, associate an object w ith a
tracker. In this case create a 3D ball of fire using
fire or an animated map to generate t he fire.
6. Adjust t he Pin Range, and then press the Pin
button to move the object to follow the tracker.
Interfa ce
Cho ose Tr acke r—Shows all the current trackers as
set up in the M otion Trackers rollout. Use this to
selectthetrackerwhosefeaturemovementsyou
willusetocontrolthepinned3dsMaxobject.The
feature must have b een t r acked already over the
frames you want to use, w ith the Tr ack and/or
Movie Stepper rollouts. Note that the accuracy
of the pinning is determined by the accuracy
of the match, so subpixel tracking is highly
recommended.
Object To Pi n—ANodePickerbuttonthatletsyou
choose the object in 3ds Max scene f o r pinning
and animating. By default the tracking object
associated with the selected tracker is preloaded
into this button. You can use this picker if you wish
to pin a different object.