1. A method for modifying an appearance of a rendered scene, the method comprising: receiving a command to modify an initial perspective at which a rendered scene is viewed, the rendered scene comprising a drawing object; in response to the command, associating the drawing object with a reference plane that is characterized by a depth parameter in the initial perspective; reverse projecting the drawing object from the initial perspective to the reference plane; receiving a definition of a modified perspective; forward projecting the drawing object from the reference plane to the modified perspective to produce a forward-projected drawing object; and rendering the forward-projected drawing object at a particular depth in the modified perspective, wherein the particular depth is at least partially based on the depth parameter of the reference plane.