Calibrating a BTSensor
BTSensor Calibration Introduction
If BTSensors that were initially placed in the Space were moved after setup or bumped accidentally, the
BTSensors must be calibrated. BTSensor calibration enables the system to determine where the
BTSensors are in relation to each other using the calibration wand, and where they are in relation to the
origin using the ground plane.
Proper calibration is very important because incorrect calibrations will send incorrect position data and
erroneously affect the BTSystem's accuracy.
Attention: Anytime a BTSensor is moved or bumped, BTSensor calibration must be performed and
saved to the Motive project file. See Working with Recordings for details saving and playing back Motive
recordings.
Differences Between Full Calibration and
Refine Calibration
There are three ways to calibrate BTSensors: a Full calibration, a Refine calibration, and a Partial Refine
calibration.
Full: This method calibrate BTSensors using no previous information. This calibration is always
used when using BlackTrax in a new Space.
Refine: This calibration method uses existing information from a previously saved calibration as a
starting point of the calibration. This calibration method is primarily used when BTSensors are
moved slightly after an initial calibration and needs calibration again.
Partial: This calibration method uses existing information from a previously saved calibration as a
foundation. The user selects either a Full or a Refine calibration type as above, and is able to
select a number of BTSensors to perform the partial calibration upon. BTSensor calibration builds
upon the previous calibration and corrects any errors. This calibration method is primarily used
when some BTSensors are moved slightly after an initial calibration and need correction, but not
the entire BTSensor rig.
Wand Calibration
Wand calibration enables BlackTrax to determine the relative position of BTSensors to each other in
the Space. This is followed by ground plane calibration, which enables BlackTrax to determine the
BTSensor’s relative position to the ground. See Ground Plane calibration below for more information.
Note: When wanding starts, Motive records the wanding and autosaves it to the session folder.
To calibrate BTSensors with the calibration wand
In Motive, change the layout to Calibration preset. From the Layout menu, choose Calibration.1.
Go to the Camera Calibration pane.1.
Choose either a Full or Refine calibration based on the guidelines above.2.
In the Calibration tab, under the Wand Option heading, set the OptiWand sub-heading to3.
Custom.
Set the Wand Length (mm) field to 1000.4.
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