This paper presents a comprehensive human modeling and simulation environment under development by the University of Iowa Virtual Soldier Research (VSR) program. This environment, called SantosTM, is a new generation of digital human simulation systems that allows for a user to interact with a digital character with full and accurate biomechanics and a complete muscular system, subject to the laws of physics. Highlighting major results in the areas of dynamic motion prediction, modeling of clothing, modeling of muscle activation and loading, and the Santos intuitive interface will be presented. This paper will feature the various modules that comprise the Santos environment.
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