Autodesk 62205-051408-9001 User Guide - Page 704

Trackers in Viewport, Using the Tracker

Page 704 highlights

26 Tracking Trackers in Viewport Once you choose a reference frame, you set up one or more Trackers. You place the Tracker(s) over the reference features you want to track. One Tracker consists of two boxes: a reference box and a tracker box. Since you may be working with several Trackers at one time, each Tracker is assigned a number. Tracker number Reference box Tracker box • The reference box holds the reference feature. For example, if you want a lens flare to follow the headlight of a truck as it moves across the screen, position the reference box over the headlight of the truck in the reference frame. • The tracker box shows the boundaries of where the Tracker searches for the reference feature. The size of this box needs to be at least as large as the reference box, and by default is slightly larger. Note: The larger the tracker box, the slower the tracking. This is because it takes more time for the Tracker to search a larger area. Using the Tracker No matter what sort of tracking you are doing, your workflow takes the following general form. To use the Tracker: 1. To track motion to a Paint object, select the object in a Paint operator. To track motion to a layer, select the layer in a composite operator. Note: If you are tracking in a Paint operator, you can select multiple objects to simultaneously create separate Trackers for each. 2. In the Tracker panel, select the source of the reference features: • In a composite operator, the source is the layer that contains the motion you want to track. • In a Paint operator, the source is either Background Clip, or Background Clip and Objects. 3. Determine a good reference frame and position the clip at that frame. This is usually the first frame. 4. Click Position, Scale/Rotation. When you click Position, the Trackers are added and shown in the viewport, Workspace panel and Timeline. 5. Position the Trackers over the reference feature(s). 6. Adjust the options in the Tracker panel as necessary. 7. Make sure all the Trackers are selected. ▲ Do not switch operators in the viewport by double-clicking items in the workspace while tracking is on. The tracker depends on the currently active item in order to function, and switching the current item or operator will force the tracker to deactivate, which will remove any tracking data you have accumulated so far. Export a tracking setup before switching operators in the viewport to keep any tracking data in progress. 8. Click one of the Analyze buttons to start the Tracker analysis from the current frame. Note: Tracking forwards and then backwards, or vice versa, or omitting frames in the middle of your sequence without setting a new reference will produce incorrect results. 9. Pause the analysis if the tracker box loses the reference feature(s). Select a keyframe and press BACKSPACE or DELETE to delete one keyframe at a time until you are 688

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Tracking
26
688
Trackers in Viewport
Once you choose a reference frame, you set up one
or more Trackers. You place the Tracker(s) over the
reference features you want to track.
One Tracker consists of two boxes: a reference box
and a tracker box. Since you may be working with
several Trackers at one time, each Tracker is assigned
a number.
The reference box holds the reference feature. For
example, if you want a lens flare to follow the
headlight of a truck as it moves across the screen,
position the reference box over the headlight of the
truck in the reference frame.
The tracker box shows the boundaries of where the
Tracker searches for the reference feature. The size
of this box needs to be at least as large as the
reference box, and by default is slightly larger.
Note:
The larger the tracker box, the slower the
tracking. This is because it takes more time for the
Tracker to search a larger area.
Using the Tracker
No matter what sort of tracking you are doing, your
workflow takes the following general form.
To use the Tracker:
1.
To track motion to a Paint object, select the object
in a Paint operator. To track motion to a layer,
select the layer in a composite operator.
Note:
If you are tracking in a Paint operator, you
can select multiple objects to simultaneously
create separate Trackers for each.
2.
In the Tracker panel, select the source of the
reference features:
In a composite operator, the source is the layer
that contains the motion you want to track.
In a Paint operator, the source is either
Background Clip, or Background Clip and
Objects.
3.
Determine a good reference frame and position
the clip at that frame. This is usually the first
frame.
4.
Click Position, Scale/Rotation.
When you click Position, the Trackers are added
and shown in the viewport, Workspace panel and
Timeline.
5.
Position the Trackers over the reference
feature(s).
6.
Adjust the options in the Tracker panel as
necessary.
7.
Make sure all the Trackers are selected.
Do not switch operators in the viewport by
double-clicking items in the workspace while
tracking is on. The tracker depends on the
currently active item in order to function, and
switching the current item or operator will force
the tracker to deactivate, which will remove any
tracking data you have accumulated so far. Export
a tracking setup before switching operators in the
viewport to keep any tracking data in progress.
8.
Click one of the Analyze buttons to start the
Tracker analysis from the current frame.
Note:
Tracking forwards and then backwards, or
vice versa, or omitting frames in the middle of
your sequence without setting a new reference
will produce incorrect results.
9.
Pause the analysis if the tracker box loses the
reference feature(s).
Select a keyframe and press
B
ACKSPACE
or
D
ELETE
to delete one keyframe at a time until you are
Tracker number
Reference box
Tracker box