A ray tracing solution for diffuse interreflection

Ward, Greg; Rubinstein, Francis; Clear, Robert

doi:10.1145/378456.378490

Cited by 212 publications

(106 citation statements)

References 13 publications

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“…Using a row‐based encoding lets us access the matrix quickly since we only need rows corresponding to edited view samples. To gain further speed, we adaptively subsample the rows using irradiance caching [WRC88]. Wavelet triple product [NRH04] can further optimize the updates and is left for future work.…”

Section: Methodsmentioning

confidence: 99%

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iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

Obert

Křivánek

Pellacini

et al. 2008

Computer Graphics Forum

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Thanks to an increase in rendering efficiency, indirect illumination has recently begun to be integrated in cinematic lighting design, an application where physical accuracy is less important than careful control of scene appearance. This paper presents a comprehensive, efficient, and intuitive representation for artistic control of indirect illumination. We encode user's adjustments to indirect lighting as scale and offset coefficients of the transfer operator. We take advantage of the nature of indirect illumination and of the edits themselves to efficiently sample and compress them. A major benefit of this sampled representation, compared to encoding adjustments as procedural shaders, is the renderer-independence. This allowed us to easily implement several tools to produce our final images: an interactive relighting engine to view adjustments, a painting interface to define them, and a final renderer to render high quality results. We demonstrate edits to scenes with diffuse and glossy surfaces and animation.

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Section: Methodsmentioning

confidence: 99%

“…We compute high quality images using an offline renderer based on final gathering accelerated by irradiance and radiance caching [WRC88, KGPB05]. Multiple bounces are handled by using photon mapping.…”

Section: Methodsmentioning

confidence: 99%

iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

Obert

Křivánek

Pellacini

et al. 2008

Computer Graphics Forum

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“…Gradient information may be used not only to determine the support size of reconstruction filters, but also their anisotropic shapes. Irradiance caching [WRC88] is a highly practical realization of this basic intuition, designed specifically for evaluating irradiance due to indirect illumination. It computes high quality irradiance samples at sparse locations in the image plane, and estimates an upper bound on the irradiance gradients to control the density of irradiance samples as well as the support of the reconstruction filters.…”

Section: Derivative Analysismentioning

confidence: 99%

“…Parker and Sloan [PS89] and Guo [Guo98] sample the image plane using progressive refinement, and both apply polynomial reconstruction filters. Ward et al 's irradiance caching algorithm [WRC88] sparsely and adaptively samples irradiance in the image plane in a greedy fashion, and uses a custom tailored reconstruction strategy to interpolate irradiance at each pixel. Inspired by these works, other researchers have considered more advanced perceptual error estimates [BM98,RPG99], or alternative reconstruction strategies such as splatting [RW94] and anisotropic diffusion [McC99].…”

mentioning

confidence: 99%

Recent Advances in Adaptive Sampling and Reconstruction for Monte Carlo Rendering

Zwicker

Jarosz

Lehtinen

et al. 2015

Computer Graphics Forum

122

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Monte Carlo integration is firmly established as the basis for most practical realistic image synthesis algorithms because of its flexibility and generality. However, the visual quality of rendered images often suffers from estimator variance, which appears as visually distracting noise. Adaptive sampling and reconstruction algorithms reduce variance by controlling the sampling density and aggregating samples in a reconstruction step, possibly over large image regions. In this paper we survey recent advances in this area. We distinguish between "a priori" methods that analyze the light transport equations and derive sampling rates and reconstruction filters from this analysis, and "a posteriori" methods that apply statistical techniques to sets of samples to drive the adaptive sampling and reconstruction process. They typically estimate the errors of several reconstruction filters, and select the best filter locally to minimize error. We discuss advantages and disadvantages of recent state-of-the-art techniques, and provide visual and quantitative comparisons. Some of these techniques are proving useful in real-world applications, and we aim to provide an overview for practitioners and researchers to assess these approaches. In addition, we discuss directions for potential further improvements.

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“…It is the case of methods such as radiance caching [WRC88], irradiance caching [KGPB05] and photon mapping [Jen96], which use the precomputation step to collect and store information in the form of an (ir)radiance cache and photon map respectively. It is the case of methods such as radiance caching [WRC88], irradiance caching [KGPB05] and photon mapping [Jen96], which use the precomputation step to collect and store information in the form of an (ir)radiance cache and photon map respectively.…”

Section: Illumination Integral Evaluationmentioning

confidence: 99%

Efficient Quadrature Rules for Illumination Integrals: From Quasi Monte Carlo to Bayesian Monte Carlo

Santos

Bouville

Marques

2015

Synthesis Lectures on Computer Graphics and Animation

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is series will present lectures on research and development in computer graphics and geometric modeling for an audience of professional developers, researchers and advanced students. Topics of interest include Animation, Visualization, Special Effects, Game design, Image techniques, Computational Geometry, Modeling, Rendering and others of interest to the graphics system developer or researcher. ABSTRACTRendering photorealistic images is a costly process which can take up to several days in the case of high quality images. In most cases, the task of sampling the incident radiance function to evaluate the illumination integral is responsible for an important share of the computation time. erefore, to reach acceptable rendering times, the illumination integral must be evaluated using a limited set of samples. Such a restriction raises the question of how to obtain the most accurate approximation possible with such a limited set of samples. One must thus ensure that sampling produces the highest amount of information possible by carefully placing and weighting the limited set of samples. Furthermore, the integral evaluation should take into account not only the information brought by sampling but also possible information available prior to sampling, such as the integrand smoothness. is idea of sparse information and the need to fully exploit the little information available is present throughout this book. e presented methods correspond to the state-of-the-art solutions in computer graphics, and take into account information which had so far been underexploited (or even neglected) by the previous approaches. e intended audiences are Ph.D. students and researchers in the field of realistic image synthesis or global illumination algorithms, or any person with a solid background in graphics and numerical techniques.

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A ray tracing solution for diffuse interreflection

Cited by 212 publications

References 13 publications

iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

Recent Advances in Adaptive Sampling and Reconstruction for Monte Carlo Rendering

Efficient Quadrature Rules for Illumination Integrals: From Quasi Monte Carlo to Bayesian Monte Carlo

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