[1] : The Free On-line Dictionary of Computing (27 SEP 03)

ray tracing
     
         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: news:comp.graphics.raytracing.
     
       
     http://directory.google.com/top/computers/software/graphics/3d/ray_tracing/.
     
        2003-09-11
     
     
see also:
computer graphics images pixel splines parallel processing radiosity 
usenet lt;news:comp.graphics.raytracinggt; lt;http://directory.google.com/top/computers/software/graphics/3d/ray_tracing/gt; 

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