[9.6.4.2] A ray tracing technique that casts rays from a desired observer position through a viewing plane, or away from a desired analysis point, into the environment. Upon striking a surface, rays may then be recast toward light sources and other surfaces to determine the luminance of the surface. This technique is often used to create images of a lighted space or to determine the illuminance or luminance at a point.

« Back to Definitions Index