Perceptual artefacts, suspension of disbelief and realism in stereoscopic 3D film

Stereoscopic film has long held an allure as the ultimate in fidelity for cinema and, as such, been a goal for those seeking the most compelling illusion of reality. However, the fundamental and technical limitations of the medium introduce a number of artefacts and imperfections that impact the viewer experience. The renaissance of stereoscopic three-dimensional (S3D) film requires that film-makers revisit assumptions and conventions about factors that influence the visual appreciation and impact of their medium. This article will discuss a variety of these issues from a perceptual standpoint and their implications for depth perception, visual comfort and sense of scale. The impact of these perceptual artefacts on the suspension of disbelief and the creation of alternate realities is discussed as is their deliberate use when artistic considerations demand breaks with realism.