The Extra Tex render channel allows you to render an image with a single texture mapped across all the geometry in the scene. This is useful for creating custom render elements by assigning different textures. For example the user can create a custom ambient occlusion pass by assigning the Dirt texture to the Extra Tex render channel.
Name - the name of the render channel
Affect Matte Objects - controls whether or not matte objects will be present in the render element
Filtering - enables or disables the AA filtering for the current render channel
Consider for AA - allows you to enable or disable the the sampling of the current render channel for antialiasing
