Color Defines the light color. Intensity Species the light intensity. Exposure This is an additional control over the standard light intensity. Exposure is in many cases a preferred control due to its likeness to photography. Final light intensity is thus computed by: Decay Rate Specify the rate at which the light intensity decreases in function of the distance to the light source. The available values are: Contribution Specifies a multiplier for the light contribution to diffuse rays. Specular Contribution Specifies a multiplier for the light contribution to specular rays. Hair Contribution Specifies a multiplier for the light contribution to rays involved in hair shading. Enable Turn this parameter off to disable the effect of the various light contribution multipliers.I = intensity * pow(2, exposure)Parameter Description No Decay Light intensity remains constant with respect to distance. Linear Light intensity decreases linearly with distance. Quadratic Light intensity decreases proportionally to the square of the distance. This is the physically correct behaviour. Cubic Light intensity decreases proportionally to the cube of the distance.
Diffuse Contribution
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