This equation is referred to as the reflectance equation or the illumination integral. Figure 20-1 shows an example of our results.įigure 20-2 Illumination Integral Illustration However, their use may be too cumbersome because they require a hefty amount of precomputation or a sizable code base for glossy surface reflections.Īs an alternative, we present a technique for image-based lighting of glossy objects using a Monte Carlo quadrature that requires minimal precomputation and operates within a single GPU shader, thereby fitting easily into almost any production pipeline requiring real-time dynamically changing materials or lighting. 2006) or spherical harmonics (Ramamoorthi and Hanrahan 2002)-provide real-time visualizations. 2000)-plus other frequency space solutions using wavelets (Wang et al. Environment map prefiltering techniques (Kautz et al. Material design, lighting design, architectural previsualization, and gaming are just a few such applications. High-fidelity real-time visualization of surfaces under high-dynamic-range (HDR) image-based illumination provides an invaluable resource for various computer graphics applications. GPU-Based Importance SamplingĬzech Technical University in Prague 20.1 Introduction You can also subscribe to our Developer News Feed to get notifications of new material on the site.Ĭhapter 20. The CD content, including demos and content, is available on the web and for download. GPU Gems 3 GPU Gems 3 is now available for free online!
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