Whether
you want to quickly perform straightforward 2D compositing or create
3D effects, the first thing you'll do is set your composition background
to define the rendering plane, then you'll create layers in Reaction.
NoteYou do not have to
connect an image generator to set the background; you can work on
an empty background. You'll see that when you build a composition
using the Layer Editor; the background appears automatically when
you add a Reaction tool to your composition.
