6 Interaction devices
the use with two IR cameras. You will get the best measurement results, when the point-
ing device is facing the cameras as shown in figure 6.26 on page 101 (i.e. markers have
to be oriented towards the cameras). Typically, the position of the tool’s tip is measured
in the DTrack2 room coordinate system which was fixed during room calibration.
Optionally, the ART Measurement Tool can calculate the position relative to a "reference
body". Then, the Measurement Tool is measuring distances to the origin of the reference
body coordinate system, and not to the origin which was defined during room calibration.
Data output The output data consists of:
• position and orientation of the tool’s tip,
• number of the Measurement Tool ,
• rotation matrix of the target.
Please refer to chapter B on page 250 for more information about the format of the output
data.
6.5.1 Measurement Tool Configuration
First, you have to define how many Measurement Tools you want to use. Therefore,
please go to Settings → Measurement Tool (see figure 6.27 on page 102).
Figure 6.27: Measurement Tool Settings
102
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