1. A method for calibrating one or more projector comprising the steps of: a. selecting correspondences in at least one of (i) at least one overlap region of images generated on a surface defining a screen by two or more projectors and (ii) an overlap region of the screen of separate components of at least one projector; b. finding a mapping to a common coordinate system across all of at least one of (i) the two more projectors and (ii) the separate components using the selected correspondences; and c. finding a mapping from input imagery to the common coordinate system and thereby to the screen.