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80 4. Building a Practical VR System
Figure 4.21. By placing markers (the letters A, C and D) on the objects to be tracked,
it is possible to determine their locations within the scene and track their movement.
Using multiple camera views allows the tracking to continue so long as each marker is
visible in at least one camera’s field of view. (Scene courtesy of Dr. B. M. Armstrong
and Mr. D. Moore.)
4.3.5 Mechanical Tracking
Mechanical tracking determines the position of a tracked point by connecting
it to a reference point via an articulated linkage of some kind. H aptic devices
used to give force feedback in a limited desktop working volume ...