Image Name Specifies the texture file to use as an environment map. Mapping Defines how the texture will be mapped on the environment sphere. The available options are: Intensity Exposure Tint A multiplier applied on the environment appearing in the rendered image background. This parameter has not effect unless the Visible to Camera parameter in the Object tab is turned on.Texturing the Environment Light
Value Description Spherical (latlong) Angular Environment Light Intensity and Tint
Background Contribution