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A Method for Fast Rendering of Caustics from Refraction by Transparent Objects
Kei IWASAKI Fujiichi YOSHIMOTO Yoshinori DOBASHI Tomoyuki NISHITA
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2005/05/01
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Cyberworlds)
caustics, global illumination, real-time rendering, graphics hardware,
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Caustics are patterns of light focused by reflective or refractive objects. Because of their visually fascinating patterns, several methods have been developed to render caustics. We propose a method for the quick rendering of caustics formed by refracted and converged light through transparent objects. First, in the preprocess, we calculate sampling rays incident on each vertex of the object, and trace the rays until they leave the object taking refraction into account. The position and direction of each ray that finally transmits the transparent object are obtained and stored in a lookup table. Next, in the rendering process, when the object is illuminated, the positions and directions of the rays leaving the object are calculated using the lookup table. This makes it possible to render refractive caustics due to transparent objects at interactive frame rates, allowing us to change the light position and direction, and translate and rotate the object.