8

Camera Tracker: Move Smoothing Rollout 659
AnimationStartframeletsyoupositionthemovie
frame range relative to the animation fr ame range.
Thepositiondataforamatchwillbetakenfrom
the tracker frames starting at the Movie Start
spinner value and the camera will be matched and
animated starting from those frames.
Movie Start—Sets the start of the range to be
matched in the movie.
Animation Star t—Sets the start of the range in
the animation. Use this if the animation range is
different from t he mov ie range.
Fr am e Cou n t —Sets the number of frames to be
matched.
Reset Ranges—Reloads the maximum frame
number and count ranges into the match range
spinners f rom the current movie and 3ds Max
scene setti ngs. This is useful if you change the
animationframerangeinthescenewhilethe
tracker is open.
Animate Displays—Controls whether the 3ds Max
view port appears and if the Movie window updates
frame-by-frame to sho w the match results. This
display update can be very time-consuming, so it’s
often b est to leave this turned off and review the
match results by looking at the Camera function
curves in Track View or by stepping through the
3ds Max animation a frame at a time after the
match.
Generate Keyframes—Generates keyframes for the
estimated p arameters on each f rame.
Match-Move—Starts the match process.
Max. Pixel Error—Displays the running maximum
tracking error and frame. The error is shown
in pixel fractions, and gives the largest distance
between any feature and the viewed posit ion of
its associated tracking object over all the frames
matched. Youcanusethistogiveageneral
estim ate of how goo d the match is and the frame
to investigate if errors are problematic. The pixel
error display also interactively updates as you
nudge tracker gizmos in Live Camera Match
mode, showing the current maximum match
distance for t he ca mera; see
Movie Stepper Rollout
(page 2–653)
.
Note that this error m ight be exaggerated when
you employ match point weighting, as this tends to
distribute the errors toward the nonweight points.
Show Er rors—Opens a text window containing a
list of the m aximum errors for each of the matched
frames, so you can look over the whole set of
match frames and identif y which f rames to check.
Camer a Tr ack er : M ove S moothing
Rollout
Utilities panel > Utilities rollout > More button > Util ities
dialog > Camera Tracker > Move Smoothing rollout
Because the match-move algorithm is not
always exact and is highly susceptible to field
measurement error or feature tracking errors, and
becausethematchforeachframeiscomputed
independently, the results can be "noisy",
particularly if field of view is estimated. In
match-move situations where the real camera
performs smooth moves, it mi g ht be useful to filter
the match result s to eliminate this noise.
You use the Move Smoothing rollout to control
and perform these smoothing operations after a
match has been created.