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10.6 SpotLight

A SpotLight is a light that shines from a given location and in a given direction.

The SpotLight is the most computationally expensive of the light types, as distance from the light source, surface orientation, and distance from the center of the conical beam must all be evaluated for all objects within a SpotLight’s zone of influence.

A SpotLight contains two properties:

Spread angle—Width of the beam in radians

Concentration—Strength of the beam within the conical region