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Displacement Mapping for the Precise Representation of Protrusion  

Yoo, Byoung-Hyun (한국과학기술원 기계공학과)
Han, Soon-Hung (한국과학기술원 기계공학과)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.33, no.10, 2006 , pp. 777-788 More about this Journal
Abstract
This paper describes a displacement mapping technique which represents protruded shapes on the surface of an object. Previous approaches for image-based displacement mapping can represent only shapes depressed from the polygon surface. The proposed technique can represent shapes protruded from the underlying surface in real-time. Two auxiliary surfaces which are perpendicular to the underlying surface are added along the boundary of the polygon surface, in order to represent the pixels which overflow over the boundary of the polygon surface. The proposed approach can represent accurate silhouette of protruded shape. It can represent not only smooth displacement of protruded shape, but also abrupt displacement such as perpendicular protrusion by means of adding the supplementary texture information to the steep surface of protruded shape. By per-pixel instructions on the programmable GPU this approach can be executed in real-time. It provides an effective solution for the representation of protruded shape such as high-rise buildings on the ground.
Keywords
image-based rendering; motion parallax; protruded shape representation; real-time rendering; silhouette rendering; steep displacement mapping; surface details;
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