The term "virtual reality" is often used to
describe interactive software programs in
which the user responds to visual and hearing
cues as he or she navigates a 3D environment
on a graphics monitor.
The user has a variety of input devices to
navigate that world and interact with virtual
objects, all of which must be linked together
with the rest of the system to produce a fully
Computer modeling is used to simulate the
structure and appearance of both static objects,
such as building architecture, and dynamic
situations, such as a football game.
Computer models can enable the user to test
the consequences of choices and decisions.
They can provide cutaway views that let you see
aspects of an object that would be invisible in
the real artifact, as well as visualization tools
that can provide many different perspectives.
Physical models that reproduce behavior are
limited by the physics of the world, while
computer models have much looser bounds.
Computer models enable you to run
companies and civilizations, fight battles,
play football games and evolve new species