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Ray Tracing

Very realistic graphics can be produced through "Ray Tracing".
An object is created in the computer's memory.  Colour and surface
texture information is fed in with the eyepoint and light source(s). Light rays
are generated from the eyepoint and traced until they either hit the light
source, go to infinity or are absorbed.  Each time the object is encountered
the light ray may be reflected, refracted or fully or partially absorbed.
This is done for all possible rays emanating
from the eye and the results plotted on the screen.  Ray traces are
very heavy on computer time!
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Graphics courtesy C. Y. Tan
(4th year project)
