This paper describes a method for correcting static errors in the position component of a 6-degree-of-freedom tracker in a projection-based VR system. This method allows users to observe where errors in the environment are significant and correct them interactively. Later touch-up correction is possible as well. This technique is based on superimposing targets in physical space with their virtual images. The only hardware addition to the VR system required is a few precisely placed targets.

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Czernuszenko, M., Sandin, D., DeFanti, T., Line of Sight Method for Tracker Calibration in Projection-Based VR Systems, Proceedings of 2nd International Immersive Projection Technology Workshop, Ames, Iowa, May 11th, 1998.