User Manual

Table Of Contents
After an initial solve, the 3D output displays the point cloud and the camera, along with the
image connected to it. Selecting points displays the Camera Tracker toolbar above the viewer,
which gives control of various functions, such as renaming, deleting, and changing the colors of
points in the point cloud.
3D output of a point cloud and a solved camera path.
Auto-Tracking in the Camera Tracker
Tracking is the term used to describe the task of observing or analyzing a sequence of frames
(or clip). The Camera Tracker node must take into account the movement of the source footage
before it can determine the location and movement of the virtual camera. The Camera Tracker
tool automatically searches for features that are high-contrast patterns within the clip and
assigns trackers to those features. Having a wide distribution of tracking points across the
frame and having points with long durations results in the best track.
Increasing Auto-Generated Tracking Points
Unlike the Tracker node, setting tracking points is entirely automatic in the Camera Tracker, but
the Detection Threshold and Minimum Feature Separation sliders let you adjust the criteria by
which tracking points are found. Lowering these parameters lets you increase the number of
tracking points that will be found. This can be useful if the scene has too few points, which will
prevent the solver from generating an accurate camera and point cloud. However, make these
adjustments with care, since adding too many points may generate redundant trackers that
slow down the entire process with minimal benefit.
Previewing Tracking Points
You can view the tracking points currently generated on the clip by viewing the Camera Tracker
node and turning on the Preview AutoTrack Locations checkbox. This causes green tracking
points to be displayed in the viewer as you play through the clip. Using this preview, you can
decide whether you need to make adjustments to the Detection Threshold or Minimum Feature
Separation to increase or decrease the number of tracking points that are found automatically.
1593Chapter – 77 3D Camera Tracking