Wasn't this covered in the AUM? But very old now I think. AUM 43 beginners corner - old but might give you some ideas.
I like Sivan's you just have to shift the alpha spots around when the camera moves till they are off screen. Maybe you could use the view instructions to actually black out parts of the camera-view-panel like a post-processing effect, but I know little about that.
Last edited by Malice; 07/21/13 17:29.