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The ecient rendering of large dynamic scenes is an important open problem. Optimization techniques for static scenes, such as output-sensitive visibility calcu- lation, must be carefully adapted to dynamic models in order to remain eective. Distributed virtual envi- ronments pose a particular diculty, because commu- nication between the users must be minimized in ad- dition to each user's rendering time. We show how output-sensitive visibility calculation algorithms can be adapted to dynamic scenes, and used to reduce the com- munication requirements between workstations in a dis- tributed virtual environment. The solution is based on temporal bounding volumes, guaranteed to contain the dynamic objects for some period of time. These volumes are inserted into a visibility algorithm's main data struc- ture instead of hidden dynamic objects. Subsequently a dynamic object is ignored until its bounding volume becomes visible or is no longer guaranteed to contain the object. In a distributed virtual environment, this saves not only the rendering of the object, but its up- date through a communication network too. We show an algorithm which combines this method with BSP tree based output-sensitive visibility calculation, and report on the implementation of our system.

Output-senstitive rendering and communication in dynamic virtual environments