Computer graphics algorithms have for long dealt with simulation of physics: simulation of the geometry of a real-world space, simulation of the light propagation in a real environment and simulation of motor actions with appropriate tracking. Perception principles have subsequently been incorporated into rendering algorithms in order to save rendering computation and produce photorealistic images from a human rather than a machine point of view. With virtual environment (VE) simulator technologies simulating real-world task situations mainly for transfer of training, the research community is challenged to produce a complex system. Furthermore, accurate simulation of physics is often not required in order to induce reality. Much less detail is adequate. This paper is going to review research literature exploring behavioral fidelity and reality benchmarking in interactive VEs focusing on results from two studies aiming to simulate perceptual processes. Study 1 investigates spatial awareness based on merging episodic information with spatial preconceptions and Study 2 looks at subjective impressions of illumination
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