VRED - Virtual Reality Editor - PI-VR GmbH

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3.19. TRACKING 3. USER INTERFACE scribed above. A calibration needs one sensor that describes the new coordinate systems, both its new origin and its new orientation. You can also edit the calibration matrix directly, but it is discouraged to use this method. When a device is created and selected, sensors can be added to the device. Unfortunetaly VRPN does not tell which sensors are connected, so you have to enter them manually in the sensor list. You can also name each sensor for accessing these via Python-scripts – the name has no other function. The following sensor types are supported: • Buttons. • Analogs. • Dials. • Bodies. Bodies probably are the most interesting sensor, as these are the only sensors that have a position and orientation in space. Thus these are also the only sensors that can be calibrated or connected to a node. Connecting a body to a node is an important task that will update a transform nodes matrix with the values coming from the corresponding sensor. In order to connect a sensor with a node (only transform nodes are supported), simply enter the name of the node in the field Target of the sensor. There are three special targets that connect a sensor to the camera instead of a node. These are as follows: 179
3.19. TRACKING 3. USER INTERFACE • powerwall. This special target enables headtracking as needed for powerwall projections. In order to make this mode work, you either have to use a render cluster or enable the powerwall viewing mode from the main menu bar in VRED. • hmd. The HMD mode is for head mounted displays. • camera. The camera mode is a very special mode that simply tracks the position of a sensor but does not track its orientation. In addition to these special targets you can also enable or disable the absolute tracking mode as described above by clicking the checkbox in the last column of the sensor list. Unchecking the absolute tracking mode will enable a tracking mode that transforms the target relativ to the camera position. Using the context menu you can also calibrate any sensor of type body, as described above. The calibration will reset the position and orientation of the node that is connected to the body. 3.19.5 Tracking Servers The second tab of the tracking module contains a list of VRPN servers which are controlled by the cluster service. You can add new servers by using the context menu and entering their network adress. All servers in this list can be started and stopped using the context menu. Note 180
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VRED - Virtual Reality Editor - PI-VR GmbH

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