Once you added source
nodes to your scene, you can access the Source menu to apply various
settings.
To access the Source menu:
Do one of the following:
Select a Matte or Front Source node in
the schematic, and then click the Source menu button.
NoteIf no source node
is selected when first accessing the Source menu, or if there are
no source nodes present in the scene, all of the options in the
menu are disabled.
Double-click a Matte or Front Source
node in the schematic.