It is sometimes useful to have a fine and direct control on how the light intensity affects various shading components. The following controls allows for that: Diffuse Contribution Specifies a multiplier for the light contribution to diffuse shading. Specular Contribution Specifies a multiplier for the light contribution to specular shading. Hair Contribution Specifies a multiplier for the light contribution to hair shading. Enable Turn this off to disable the effect of the various light contribution multipliers.Controlling the Light Contribution to the Shading Components