ABSTRACT
When projected images must closely align with stage scenery, it becomes vital to know what the stage looks like from the projector’s point of view. Careful preparation of artwork must compensate for the focal length of the lens, length of throw, and angle of the projector axis relative to the projection surface. In simple cases, these factors can be dealt with by drafting a distorted grid and scaling the artwork on it. In most cases, however, the preparation of such a grid is extremely difficult because of the complex geometry involved.
