| http://www.w3.org/ns/prov#value | - In practice, a formula that works well is shown below in Equation 2: A i = min ( 1 c 1 + c 2 d S + c 3 d S 2 , 1 ) ( 2 ) The terms of equation 2 are defined as follows: Ai represents the attenuation factor for the source light, c1 is a user defined constant that keeps the denominator from becoming too small when the light is close, c2 and c3 are specific to a light source model.
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