Exclude... – This button brings up the include/exclude list which allows users to exclude objects from light's illumination and shadow casting. Use light shape – Determines whether and how the shape of the light is taken into consideration during the calculation of shadows and illumination. No – The light shape is not considered for illumination and the light is going to generate sharp shadows. For shadows – The light shape is considered only for the generation of soft shadows. The illumination is not affected by the light shape (i.e. it behaves as a point light). For illumination and shadows – The light shape is considered for the calculation of the illumination and shadows. Cast shadows – When enabled (the default), the light casts shadows. Turn this option off to disable shadow casting for the light. Affect diffuse – Determines whether the light is affecting the diffuse properties of the materials. Diffuse contribution – A multiplier for controlling the light's contribution to the diffuse illumination. Affect specular – Determines whether the light is affecting the specular part of the materials. Specular contribution – A multiplier for controlling the light's contribution to the specular reflection. Affect atmospherics - When enabled, the light influences the atmospheric effects in the scene. Atmospherics contribution - Determines the amount of influence the light has on the atmospheric effects. Area speculars – When disabled, the particular light is rendered as a point light in the specular reflections |