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# Lights and Constraints in Look Files

If lights and constraints are declared in a Look File there is some special handling needed when they are brought in because knowledge of lights and constraints is generally needed at the global scene level.

There is a special node called LookFileLightsAndConstraintsActivator designed to declare any Look Files that are being used that declare lights and constraints. This handles the work of adding them to the global lists held at /root/world.