EG2011
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Browsing EG2011 by Subject "Categories and Subject Descriptors (according to ACM CCS): Computer Graphics [I.3.7]: Three-Dimensional Graphics and Realism"
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Item An Error Bound for Decoupled Visibility with Application to Relighting(The Eurographics Association, 2011) Schwenk, Karsten; Fellner, Dieter W.; N. Avis and S. LefebvreMonte Carlo estimation of direct lighting is often dominated by visibility queries. If an error is tolerable, the calculations can be sped up by using a simple scalar occlusion factor per light source to attenuate radiance, thus decoupling the expensive estimation of visibility from the comparatively cheap sampling of unshadowed radiance and BRDF. In this paper we analyze the error associated with this approximation and derive an upper bound. We demonstrate in a simple relighting application how our result can be used to reduce noise by introducing a controlled error if a reliable estimate of the visibility is already available.Item Realistic Simulation of Peripheral Vision Using An Aspherical Eye Model(The Eurographics Association, 2011) Wu, Jiaze; Zheng, Changwen; Hu, Xiaohui; Xu, Fanjiang; N. Avis and S. LefebvreA novel method is proposed to accurately simulate the peripheral vision under different visual perception. An accurate aspherical schematic eye model is firstly introduced to reasonably predict the anatomical and optical properties of the human eye. This eye model is composed of the Navarro schematic eye model with aspherical surfaces as a basic model, and a corresponding accommodation model, and both these models are combined to simulate the varying refractive power of the human eye. Finally, distributed ray tracing techniques is combined with this eye model to produce a variety of visual results.