Ray-tracing definitions

A rendering method that simulates light reflections, refractions and shadows. It follows a light path from a specific source and computes each pixel in the image to simulate the effect of the light. It is a very process-intensive operation. See reflection mapping and radiosity.
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A computer graphics technique that produces realistic images by projecting imaginary light rays to determine which parts of an object should be illuminated.
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A technique used in optics for analysis of optical systems.
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