First, make sure the node with the existing power window is selected, then navigate to Color->Nodes->Add Outside Node, or hit Opt/Alt+O. Notice the Outside node has a new dotted line connecting its alpha channel to the previous node.
First, make sure the node with the existing power window is selected, then navigate to Color->Nodes->Add Outside Node, or hit Opt/Alt+O. Notice the Outside node has a new dotted line connecting its alpha channel to the previous node.