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PPT User’s Manual
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 The first marker will be a combination of the orientation data and the position
which is the center of the two selected markers.
 The previous two input positions will be removed from the output, so there will
be one less marker.
 If position data not part of the two marker constellation was present as marker
1, it will be remapped to one of the markers from the constellation to preserve
it.
 If the apply to all checkbox is selected, all orientation values will be adjusted
with the distortion correction.
PPT Eyes - Optical 2-point for CAVEs
Use When:
 You need to track a user's head position and yaw orientation in front of a
screen, like for a Powerwall/CAVE display.
 You want to track the user's head optically without a inertial sensor.
 You do not need head pitch tracking - a Powerwall does not need pitch
information.
You Need:
1. Two PPT markers attached on the left and right sides of the head or LCD
shutter glasses.
Software Configuration:
1. Set the number of markers to at least 2 in the PPT interface.
2. Add the "CAVEyes" Post-Process Plug-in found in the Configure Panel.
3. Click the configure button on the plugin and enter the distance between the
markers mounted on the left and right sides of the tracked object.
4. Leave the separation tolerance at the default, but if there are problems with
tracking you may want to make this larger. This value specifies how flexible it
should be when looking for the two markers on the head.
Data Output:
 The first marker will contain a combined position value which is the center of
the two selected markers, with calculated yaw and roll for orientation.
 The previous two input positions will be removed from the output, so there will
be one less marker.
 If position data not part of the two marker constellation was present as marker
1, it will be remapped to one of the markers from the constellation to preserve
it.