The rest of this document is organized as follows. Chapter 2 describes the precise pipeline, both preprocessing and runtime, of the reconstruction mechanism. Chapter 3 describes the 3D head alignment and resampling algorithms. Chapter 4 derives the optimal linear estimator used to fill in missing data from the tracker. Chapter 5 describes the mathematical formulation of the modular eigenspace technique. Chapter 6 details the experiments used to test the system. Finally, Chapter 7 draws conclusions based on experiences with the system. Descriptions of most of the software written for the reconstruction mechanism are given in Appendix A.