ray tracing
<graphics> A technique used in computer graphics to create realistic
images by calculating the paths taken by rays of light entering the observer's
eye at different angles. The paths are traced backward from the viewpoint,
through a point (a pixel) in the image plane until they hit some object in the
scene or go off to infinity. Objects are modelled as collections of abutting
surfaces which may be rectangles, triangles, or more complicated shapes such as
3D splines. The optical properties of different surfaces (colour, reflectance,
transmitance, refraction, texture) also affect how it will contribute to the
colour and brightness of the ray. The position, colour, and brightness of light
sources, including ambient lighting, is also taken into account.
Ray tracing is an ideal application for parallel processing since there are many
pixels, each of whose values is independent and can thus be calculated in
parallel.
Compare: radiosity.
Usenet newsgroup: comp.graphics.raytracing.
http://directory.google.com/Top/Computers/Software/Graphics/3D/Ray_Tracing/.
(2003-09-11)
Nearby terms:
ray casting « Rayleigh distribution « Ray Tomlinson
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