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Proceedings of CAD'15, 2015, 222-224
Investigation on Light Effect on Spatial Illusion Resulting from Forced Perspective

Nan-Ching Tai, National Taipei University of Technology

Abstract. Linear perspective is a drawing system that can transform the geometry from the conceptual form to perceptual, and thus is an essential tool for designers to predict the spatial perception of the proposed designs of constructions. Linear perspective is also identified as an effective pictorial depth cue that can provide the visual information to retrieve the three-dimensional sense of depth from both the two-dimensional retinal images and the drawn pictures. As a result, it has been used as an effective design strategy to create forced perspectives that can exaggerate depth perception of architectural scenes. Light has also been observed to influence the perceptual judgment of depth in an architectural scene. Luminance contrast has been proven, through perceptual studies conducted using the perceptually realistic computer-generated environment, to be an effective depth cue that can create illusory depth effects. In this study, the interrelationship of the size-related depth cue of forced perspective and the tone-related depth cue of luminance contrast was investigated in a three-dimensional setting. Architectural space of Colonnade Spada was designed based on the forced perspective to create illusory depth. The original design has a series of skylights that no longer exist. For this study, the Colonnade Spada (with and without skylights) was simulated in a computational environment.

Keywords. Light, Force Perspective, Depth Perception, Spatial Illusion

DOI: 10.14733/cadconfP.2015.222-224