Chapter 7
7.2 Wired hybrid targets
Selecting the pulse generating source Please refer to chapter 7.2.5 on page 119 for
further details.
Z
It is NOT recommended to select a wireless inertial sensor as pulse
generator due to the nature of the connection (i.e. high latencies and
timing jitter). Therefore change the default settings in the menu Set-
tings → Tracking only when necessary.
7.1.3 Calibration of custom wireless hybrid targets
Custom wireless hybrid targets will show up as ’not calibrated’ in the column Calibration
under the tab ’standard bodies’ in the menu Body Administration (Shortcut:F8) or in the
sub-dialogue Hybrid Bodies of the menu Inertial Sensor Settings. Therefore a multi-step
calibration procedure for each body has to be performed analogue to wired hybrid targets.
Please refer to chapter 7.2 on page 111.
i
ART delivers a pre-calibrated hybrid motion capture suit, i.e. both
the optical target geometry as well as the hybrid body calibration are
stored directly on the sensor. Unless the hybrid targets are disassem-
bled or become damaged, it is sufficient to identify and add all sensors
using the menu Settings → Inertial Sensor → Add Sensors. There is
no need to (re-)assign the inertial sensors on pre-calibrated targets or
to calibrate the targets manually.
Z
Reassignment or disassociation of inertial sensors and pre-calibrated
optical targets will render the corresponding bodies useless. There-
fore enter the sub-dialogue Inertial Sensor Settings → Hybrid Bodies
only when necessary.
7.2 Wired hybrid targets
Within DTrack2 go to the menu Settings → Inertial Sensor → Hybrid Bodies (see figure
7.8 on 114) and activate the desired amount of bodies. Next assign suitable names by
double-clicking the corresponding field Name from row ’1...n’ under selected body. Now
a multi-step calibration procedure for each body has to be performed:
1. A standard optical body calibration needs to be carried out. Alternatively load a
body calibration from a file. Start by pressing the button Calibration. Please refer to
8.6.5.2 on 177 for more details.
2. An inertial sensor has to be added and then assigned to an optical target. Please
refer to chapters 7.2.1 on page 112 and 7.2.2 on page 114 respectively for further
information.
3. A hybrid body calibration has to be performed to align the inertial sensor with its
corresponding optical target by pressing the button Hybrid Body Calibration. Dur-
ing this hand-eye calibration process the relative orientation of the two coordinate
systems is determined. Please refer to chapter 7.2.3 on page 115.
111
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