Real-Time Polygonal Lighting of Iridescence Effect using Precomputed Monomial-Gaussians

Zhengze Liu,Yuchi Huo,Yinhui Yang, Jie Chen,Rui Wang

COMPUTER GRAPHICS FORUM(2024)

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摘要
The real world consists of mass phenomena, such as iridescence on thin film and metal oxide layers, that is only explicable by wave optics. Existing research can reproduce such effects with simple point lights or low-frequency environmental lighting. However, it remains a difficult task to efficiently rendering these effects when near-field, high-frequency area lights are involved. This paper presents a high-fidelity, real-time rendering algorithm for the iridescence effect under polygonal lights. We introduce a novel set of spherical functions, Monomial-Gaussians, to accurately fit iridescent materials' reflectance. With a precomputed lookup table, the Monomial-Gaussians are easily integrated over spherical polygons in linear time. Importance sampling of Monomial-Gaussians is also supported to efficiently reduce Monte-Carlo error. Our approach produces accurate renderings of the iridescence effect while still preserving high frame rates. We present Monomial-Gaussians, a novel set of spherical basis functions, to fit iridescent material and other general BRDFs more accurately than linearly transformed cosines and spherical harmonics. Our method enables real-time, high-fidelity rendering under polygonal lighting. image
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关键词
iridescence,polygonal lighting,spherical basis function
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