Fast Intensity Distribution Functions for Soft and Hard Edged Spotlights

The purpose of this paper is twofold: to propose tw o fast distribution functions for spotlights and to use terminology used in stage lighting to model these l uminaries. In OpenGL and other API’s the original Warn model is used where the light distribution is compu ted using a power function. In professional modelin g tools, a linear or a cubic function is often used. We propos e the use of two different quadratic functions inst ead that will make the computation involved faster than using the power function or a cubic function. Moreover it wi ll be more flexible than using a linear function. These f unctions can be used to model both hard and soft ed ged spotlights.

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