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From Odwiki

Ray tracing is a Rendering technique.

The basic concept of ray tracing is to send a ray, defined by an origin and a direction, into a scene. Each geometric primitive in the scene is tested for an intersection with this ray. If the ray intersects geometry, then the geometry is shaded and the color is returned.

Ray tracing can be used to compute shadows, reflections, refractions and GlobalIllumination.