
8
DTrack2
frontend software
•
The rotation around the body axis is reduced to a minimum.
We recommend that you choose the 5DOF central axis according to a direction which is
the least often parallel to the tracked body axis (e.g. floor to celling for glasses targets).
Please refer to chapter 8.5.5 on page 155 to select the central axis in the menu
Settings
→
Tracking
.
i
The best choice for the 5DOF ’
central axis
’ may be found when using
the tracking data in your application.
Details of the definition: In addition to the 5DOF central axis the system selects an axis
for each body in the body coordinate system (i.e. "pulled axis"). The rotation around the
body axis is set to the value minimizing the angle between the pulled axis and the 5DOF
central axis. The pulled axis is always perpendicular to the body axis. In addition the
following criteria are used:
•
If the 5DOF central axis is not the body axis the pulled axis is the axis minimizing
the angle to the 5DOF central axis.
•
If the 5DOF central axis is the body axis the pulled axis has a random direction in
the plain.
Coordinate system setting for type ’
5DOF
’ and ’
5DOF (cylinder)
’
In this body coor-
dinate system all markers of the target are on the selected axis. The origin is in the middle
between the two markers with the largest distance to each other. The orientation is de-
fined by the marker with the smallest distance to the origin. Its position has a negative
sign. The other two directions are undetermined due to the one degree of freedom.
Coordinate system setting for type ’
2x 5DOF (cylinder)
’
The body is expected to
consist of two connected 5DOF targets with a roughly perpendicular and constant angle
in between. These are placed on the two axes. The origin is placed at the position where
the two 5DOF targets intersect. The first axis is assigned to the 5DOF target which in-
cludes the marker with the largest distance to the origin. The other 5DOF target is placed
in the plane created by the two axes.
A click-type torque wrench is one the most prominent members of this class of bodies.
Due to the engineering backlash and other high mechanical tolerances in these devices
often times the resulting body calibrations are error-prone.
8.6.5.6 Calibration with a calibration file
To easily create backups of calibrated bodies, calibration files can be saved at a desired
location on the remote PC. These files contain the dimensions of the target and the dis-
tances between all markers. Each file is specific for just one type of target.
Just click
Load file(s)
and select the appropriate calibration file(s) or click on
Save file(s)
respectively.
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Страница 248: ...A Technical specifications ARTTRACK2 discontinued ARTTRACK3 discontinued TRACKPACK discontinued 248 ...
Страница 249: ...Appendix A A 7 System latency TRACKPACK Cascade discontinued 249 ...
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