One of the mysteries of the English language finally explained.
1Optics. The calculation of the path taken by a ray of light through an optical system such as a lens or a telescope; an instance of this.
2Computing. A method of generating an image of an object or scene in which the paths of light rays (usually in reverse, from the camera or the eye to the object) are estimated by computer, allowing more accurate renderings of reflection and refraction.
Mid 19th century (in an earlier sense). From ray + tracing.
ray tracing/ˈreɪ ˌtreɪsɪŋ/
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