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# LookFileLightAndConstraintActivator

Katana maintains a list of lights, cameras, and constraints at /root/world within the scene graph. When a Look File brings in a light or constraint, the lists at /root/world need to be updated. The LookFileLightAndConstraintActivator node activates LookFile lights and constraints by updating the respective lists. It is also used to add constraints from LookFiles to the global constraint list. This list is used to specify the order in which constraints are evaluated, so this only has to be done if the constraints from the LookFile need to be evaluated in a specific order. Because it reads its input from a LookFile-resolved scene, you should place it after either a LookFileManager or LookFileResolve node.

Choose Search Entire Incoming Scene... or Search Incoming Scene From Scene Graph Selection... from the Action menu to find available lights and constraints.

• Entries are organized by asset, location, and then light and constraint paths.

• Gray entries are pending -- found by the searching tools but not yet enabled in the scene.

• Pending entries are not saved from session to session.

• Locations (entries immediately below the asset entries) may be refreshed individually by choosing Search From Selected Locations from the right-click menu. This option is only available when one or more location entries are selected.

To enable a pending entry, choose Enable from the right-click menu at any point within the hierarchy.

Enable and disable operations executed in this manner always act upon the selected entries and all of their children. Individual light and constraint paths may also be enabled by clicking on the checkbox next their names.

To enable everything at once:

| 1. | First, choose Search Entire Incoming Scene... from the Action menu.

| 2. | When that has completed, choose Select All from the Action menu right-click on any entry and choose Enable.

Connection Type | Connection Name | Function
Input | in | The place in the node graph where you want to activate LookFile lights and constraints by updating those lists.

Control (UI) | Default Value | Function
Action | N/A | Searches the scene graph for lights and constraints brought in by Look Files then enables or disables the results as required.