1. A method of modeling relative position and relative movement of objects in a virtual reality environment, comprising the steps of: representing graphically a first object and a second object in the virtual reality environment on a graphical display; determining a first partitioning plane between said first object and said second object; determining a second partitioning plane between said first object and said second object in response to either of said first object or said second object moving across said first partitioning plane; and representing graphically on said graphical display in response to said second partitioning plane determining step new relative positions of said first object and said second object as a result of the relative movement of said first object and said second object to movement of a viewer within said virtual reality environment by selectively obscuring said first object and said second object according to the relative position of said first object and said second object in said virtual reality environment to an observation point of said viewer in said virtual reality environment.