To Set Up a Tracking Configuration

The following is an example of how to create a configuration for a projection with headtracking (glasses body) and flystick navigation.

Assume that A.R.T. room calibration was done with the Powerwall setting. This implies that the tracking coordinate system is right-handed and Y-up oriented. Its origin is on the ground and there is a front wall projection of size 3x2 metres which is orthogonal to the ground. No VRPN server is running.

  1. In VRED, select Interaction > VRPN Tracking to open the VRPN Tracking dialog box.
  2. In the VRPN Tracking dialog box, select Edit > Add Server to create a VRPN server named localhost.
  3. With the localhost server selected, load the configuration file vrpn-art.cfg from the VRED folder data\vrpn.
  4. Click Start to start the server. The Status changes to Running.
  5. With the localhost server selected, select Edit > Add Device.
  6. Name the new device DTrack to correspond to the name in the configuration file.
  7. With the DTrack device selected, change the coordinate system to Y-Up.

    This is because the room was calibrated with the Powerwall setting. You do not need to swap any axis.

  8. Set the Y-value of the Projection Origin to 1000.

    This is half the diameter of the front wall. Assume the projection is set up symmetrically.

  9. Select the device and click Edit > Add Body to add a new body to the device

    (It may be necessary to change the sensor identifier.)

  10. Name the new body Glasses.
  11. Change the target type of the body to Head Projection.
  12. If the tracker sensor for the glasses was calibrated with zero in marker, you can add a translation offset to move the reference point in the middle of the glasses.
  13. Select the device again and click Edit > Add Flystick.

    (It may be necessary to change the sensor identifier.) A button and two analogs are automatically created. They are needed for the different navigation modes.

  14. Change the navigation mode to one of the following:
    • Scene Move: Uses the predefined button of the flystick to activate the movement.
    • Point Fly: Uses the two analogs for fly-to navigation.
  15. Optional: Select Diagnostics > Connection Test to test the configuration.
  16. Click Enable/Disable Tracking in the lower toolbar to toggle tracking.