A Reaction tool is considered a “super tool” because it contains a set of tools that you can use to create 3D compositing effects on your composition. All individual tools contained in Reaction can be accessed by opening the Group Schematic. Reaction is used like any other tool, but can also be used in tandem with the Layer Editor to build and edit compositions interactively. You can use as little or as much of the available functionality as needed to get your job done. You may want to simply create a few layers where one layer is repositioned to place a character in a scene, or create a 3D scene with lighting and texture effects. Regardless, the Reaction tool behaves like any other tool in Composite; you can delete and connect a Reaction tool to other output nodes in the same manner. As always, the universal Tool Options panel is located at the right of the Tool UI—see The Tool UI.