I represent the attenuation for any given light source, e.g., how the intensity of the light is reduced with increasing distance from the object. I consist of three parts, a constant part, a linear part and a squared part. The resulting intensity for any given distance d is computed by:

intensity _ 1.0 / (constantPart + (distance * linearPart) + (distance^2 * squaredPart)).

	initialize
	constant:linear:squared:

	lighting
	computeAttenuationFor:

	testing
	isIdentity

	accessing	top
	constantPart
	constantPart:
	linearPart
	linearPart:
	squaredPart
	squaredPart:

	initialize	top
	constant:linear:squared:

	lighting	top
	computeAttenuationFor: Compute the light attenuation for the given distance

	testing	top
	isIdentity Return true if the attenuation results in a constant lighting

	instance creation	top
	constant:linear:squared:
	numElements