
8
DTrack2
frontend software
•
’
2x 5DOF (cylinder)
’ .. an L-shaped target made of ring markers which delivers
6DOF data.
To re-calibrate a body tick the checkbox
re-calibration
next to the drop-down menu. For
more information about body re-calibration please refer to chapter 8.6.5.7 on page 182.
After pressing
Calibrate
, the body calibration is started within five seconds delay.
i
After a new room calibration or room re-calibration it is not necessary
to perform a new body calibration. Only if the body itself changes you
have to calibrate the body again.
Z
The previous body calibration will be lost if you carry out a new body
calibration. If you want to save the previous body calibration please
use the ’
Save file(s)
’ option in the
Body calibration
dialogue.
8.6.5.3 Body calibration result
After successfully calibrating a body a result window is displayed (see figure 8.32 on 178).
Figure 8.32: Body Calibration Result
Z
Please double-check whether all markers of the rigid body have been
recognized.
Double-check whether all markers of the rigid body have been recognized. Then, con-
firm the result with
OK
. The information (i.e. geometry data) of the calibrated target will
be stored inside the
ART
Controller in your personal configuration (see also 8.4.2 on 142).
8.6.5.4 Selecting the coordinate system for 6DOF targets
The type of body calibration can be set as ’
due to body
’, ’
due to room
’ or ’
due to room
(zero in marker)
’. The difference between these calibration types is to be found in the
orientation of the body coordinate system relative to the body. During body calibration,
DTrack2
defines a local coordinate system (body coordinate system) for each target.
Body calibration setting due to body
The body coordinate system is fixed by the
markers of the rigid body according to a set of rules:
1. Search the biggest distance between two markers of the rigid body. These two
markers (# 1 and # 2) will define the X axis.
2. Search for a third marker (# 3) that has the smallest distance to one of the two
markers # 1 and # 2. The marker that has smallest distance to marker # 3 becomes
marker # 1. It will define the coordinate origin. The other marker will be # 2. The
positive X axis is directed from marker # 1 to marker # 2.
178
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