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Categories are similar to layers in that you can assign an object to a category and make it either visible or invisible when desired. Categories can also consist of entities on several different layers giving much needed flexibility over rigid layer conventions.

A typical use of categories would be to display multiple furniture layouts in a room. For example when showing the customer a room layout it would be possible to simply switch different furniture pieces by turning on and off selected categories. Another example of this would be to have different lighting options for a room, possibly with different spot or point lights. Unfortunately this idea does not work with the standard lights. When a light is turned off in a category its lighting effects still remain in the rendered display. Not so however if you use luminance to create your lights. Luminance is the ability to assign a light property to a standard drawing object such as a cube or sphere. Further the luminance can have very specialized light settings based on lights that can actually be purchased from companies such as Lithonia Lighting™. If objects that have an associated luminance are turned on and off from within the categories, then changes are immediately seen in the rendered view.

Show me a streaming movie using luminance