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TrackPod calibration
The software must know the precise 3D location and orientation of each
TrackPod with respect to the centre of the stage: this is called "calibrat-
ing the TrackPod". There are two ways of performing the calibration:
automatic and manual.
Automatic calibration
Automatic calibration is the most common method for setting up the
tracking system. This method entails measuring the distances between
five gaffer-tape marks on the stage floor and then pointing the TrackPod
at them to correlate those distances to actual TrackPod readings.
Figure 5 shows the location of the five stage-marks. Mark the centre of
your stage with some gaffer tape. This will be the central reference point
for the tracking system, also called the origin. Make four other marks:
the centre-edge of your stage downstage (close to the public), the centre-
edge of your stage upstage (far from the public) and the centre-edge of
the stage's right and left wings, as you stand on the stage facing the
public.
Tip: even if your public surrounds the stage or if you do not have a
specific place for the public, you must choose some points that will
define your interactive area and its orientation. These points will serve
as a reference when you are using the TrackPod software to define
regions of your stage. For convenience, if there is no clear stage
orientation, set the "downstage" of the stage to be the side that is
closest to the TrackPod computer so that the orientation of the space
matches the orientation presented in the software's map editor.
Make sure that:
1. The marks are as far apart from each other as possible in the stage.
2. That marks 1 and 3 form a straight line with the centre mark, —this
will be the orientation of the stage on the TrackPod software. Con-
versely marks 2 and 4 do not need to be in a straight line.
3. That all marks are within range of the TrackPod laser.
4. That all marks are at the same height (you may also have the marks
on an inclined plane, but then the plane becomes your stage floor and
your height references will be perpendicular to that plane).
5. That the marks are not moved during calibration and the TrackPod
tripod is not moved during and after calibration.
Martin TrackPod 1.8
Page 13
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