Modeling Three Dimensional Interaction Tasks for Desktop VR

A virtual environment is an interactive, head-referenced computer display that gives a user the illusion of presence in a virtual world. Two most significant differences between a virtual environment and a more traditional interactive 3D computer graphics system are the extent of the user's sense of presence and the level of user participation that can be obtained in the virtual environment. Over the years, advances in computer display hardware and software have substantially progressed the realism of computer-generated images, which dramatically enhanced user's sense of presence in virtual environments. Unfortunately, such progress into user's interaction with a virtual environment has not been observed.