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Those are made up values for the example. In an actual setup you will need to define the dimensions of each projected area (wall) in your trackers coordinate system. Once your tracking system is setup and calibrated, you will need to determine the 3D coordinates of each corner of the wall relative to the origin of the tracking system.
A wall is essentially a window into the virtual world. In order to render correctly, the system needs to know where the users head is in relation to the physical wall. This means the tracker you use to track the users head position needs to be the in the same coordinate system as the wall dimensions.
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