A digital editor provides the timeline control necessary to tell a story through film. Current technology, although sophisticated, does not easily extend to 3D cinema because stereoscopy is a fundamentally different medium for expression and requires new tools. We formulated a mathematical framework for use in a viewer-centric digital editor for stereoscopic cinema driven by the audience’s perception of the scene. Our editing tool implements this framework and allows both shot planning and after-the-fact digital manipulation of the perceived scene shape. The mathematical framework abstracts away the mechanics of converting this interaction into stereo parameters, such as interocular, field of view, and location. We demonstrate cut editing techniques to direct audience attention and ease scene transitions. User studies were performed to examine these effects.