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In this paper, four models of 3D measurement systems are evaluated based on collimating and perspective projections using a real-time 3D virtual scanning system. Fringe projection technique is utilized due to its popularity for real-time and high resolution applications. Analysis and performance comparison of the phase-to-coordinate relation for all four models is presented. Nonlinear system models are proposed to obtain the accurate 3D shape for collimating projection models. Finally, the coordinates acquisition, reconstruction, and display processes are performed, and results are presented to verify the proposed approaches.