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LPVR is optimized to work with ART optical tracking. Should you use LPVR with an Optitrack optical tracking system, please refer to this article for the correct marker arrangement and body adjustment in Motive. |
ART DTrack Setup
Make sure the tracking cameras operate at either the same, twice or half the refresh frequency of the HMD screen. In case of a VIVE Pro that is 90Hz. This is adjusted in the Synccard Settings in DTrack.
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NOTE: If you prefer the z-axis pointing upwards, set the coordinate system parameter to “Normal” and adjust the room directions in the LPVR tracking system configuration to e.g. the following:
X | Y | Z |
Left | Backwards | Up |
DTrack’s room calibration offers two coordinate system options. For our application Power wall is the default setting.
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If you would like to not go through the manual body calibration process, we provide a number of premade body calibration files for download on this page. These files have been calibrated using our automatic calibration algorithm and are a very close approximation of an ideal configuration.
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In the standard OpenVR coordinate system, the Z axis points “inside” the user’s head, the X-axis to the right and the Y-axis upwards. For a VIVE Pro LPVR setup this could similar to the following photos.
Example marker arrangement, front view. Two markers (for each axis) defining a horizontal line parallel to the X (red) and Y-axis (green) of the HMD will make it easier to adjust the rigid body coordinate system in the optical tracking software. | Example marker arrangement, top view. |
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As a first step in aligning the rigid body in ART, adjust the view so that you can visually assign marker balls on the HMD to markers detected by the ART body calibration.
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In the second step, use the Body position and Body orientation fields to correct the orientation of the rigid body’s coordinate system. The figure shows a correctly aligned body origin, front view opposite to the Z-axis. Note that the relative position of the coordinate origin should be ~3cm below the origin of the marker holder. It is assumed to lie in the center between the user's eyes, on the nose bridge.
Figure - Correctly aligned body origin, side view along X-axis | Figure - Correctly aligned body origin, top view along Y-axis |
Using the VIVE Hand Controller
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