NDLI: Virtual spherical gaussian lights for real-time glossy indirect illumination

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Virtual spherical gaussian lights for real-time glossy indirect illumination

Content Provider	ACM Digital Library
Author	Tokuyoshi, Yusuke
Abstract	Virtual point light (VPL) [Keller 1997] based global illumination methods are well established for interactive applications, but they have considerable problems such as spiky artifacts and temporal flickering caused by singularities, high-frequency materials, and discontinuous geometries (Fig. 1). This paper proposes an efficient technique to render one-bounce interreflections for all-frequency materials based on virtual spherical lights (VSLs) [Hašan et al. 2009]. VSLs were proposed to suppress spiky artifacts of VPLs. However, this is unsuitable for real-time applications, since it needs expensive Monte-Carlo (MC) integration and k-nearest neighbor density estimation for each VSL. This paper approximates VSLs using spherical Gaussian (SG) lights without singularities, which take all-frequency materials into account. Instead of k-nearest neighbor density estimation, this paper presents a simple SG lights generation technique using mipmap filtering which alleviates temporal flickering for high-frequency geometries and textures (e.g., normal maps) at real-time frame rates. Since SG lights based approximations are inconsistent estimators, this paper additionally discusses a consistent bias reduction technique. Our technique is simple, easy to integrate in existing reflective shadow map (RSM) based implementations, and completely dynamic for one-bounce indirect illumination including caustics.
Starting Page	1
Ending Page	4
Page Count	4
File Format	PDF
ISBN	9781450328951
DOI	10.1145/2669024.2669025
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-11-24
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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