Hierarchical Monte Carlo Radiosity

Bekaert, Philippe; Neumann, László; Neumann, Attila; Sbert, Mateu; Willems, Yves

doi:10.1007/978-3-7091-6453-2_24

Cited by 29 publications

(22 citation statements)

References 27 publications

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“…If a very dense mesh is used, the overall memory consumption of the algorithm and the computing time will raise dramatically as more lines are needed to avoid noise artifacts. For static images, this issue has been addressed using hierarchical approaches [61,62]. Such hierarchical methods have not been extended to the case of animated scenes yet.…”

Section: Multi-frame Lighting Methodsmentioning

confidence: 99%

State of the Art in Global Illumination for Interactive Applications and High‐quality Animations

Damez

Dmitriev

2003

Computer Graphics Forum

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Global illumination algorithms are regarded as computationally intensive. This cost is a practical problem when producing animations or when interactions with complex models are required. Several algorithms have been proposed to address this issue. Roughly, two families of methods can be distinguished. The first one aims at providing interactive feedback for lighting design applications. The second one gives higher priority to the quality of results, and therefore relies on offline computations. Recently, impressive advances have been made in both categories. In this report, we present a survey and classification of the most up-to-date of these methods.

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Section: Multi-frame Lighting Methodsmentioning

confidence: 99%

State of the Art in Global Illumination for Interactive Applications and High‐quality Animations

Damez

Dmitriev

2003

Computer Graphics Forum

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“…First uses of Monte Carlo methods in radiosity were proposed in References 22 and 23. Later improvements [24][25][26][27] show the usability of these kinds of approach as an alternative to deterministic methods. They provide a reliable form factor computation while no explicit storage of the form factor is needed.…”

Section: Global Monte Carlomentioning

confidence: 99%

Animating radiosity environments through the Multi‐Frame Lighting Method

Besuievsky¹,

Pueyo²

2001

J. Visual. Comput. Animat.

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Realistic rendering animation is known to be an expensive processing task when physically based global illumination methods are used in order to improve illumination details. This paper presents the Multi-Frame Lighting Method, an efficient algorithm to compute animations in radiosity environments. The method, based on global Monte Carlo techniques, performs the lighting simulation of groups of consecutive frames in a single process. All frames computed have the same accuracy as if they were computed independently while a significant high speed-up is achieved. Results show that the method it is an interesting alternative for computing non-interactive radiosity animations for moderately complex scenarios. Copyright IntroductionHigh-quality realistic animation is often a desired objective in image synthesis. The accurate computation of the illumination plays a very important role in the improvement of realism on simulated sequences. For this reason, global illumination models are required when computing realistic animations. These models have in general a high computational cost when dealing with complex scenarios where we want to simulate illumination details like soft shadows, diffuse interreflections or more complex lighting phenomena involving caustics or participating media. For animations, usually composed of sequences of lots of images, this problem grows, leading to large amounts of computation if each frame is treated independently. Thus, efficient solutions are searched in order to reduce the computation cost. Considering that in most cases changes in illumination between consecutive frames are usually smooth as a consequence that animation changes are also smooth, a natural possibility for an efficient approach is to improve global illumination models in order to make use of this source of coherence. For example, a significant computation time can be saved by reusing illumination already computed that is invariant in an interval of time within the animation.The radiosity method, introduced in Goral et al., 1 allows interactive walkthroughs since it is a viewindependent global illumination solution. For this reason, it is an attractive method to be used both in animations and in interactive applications. Many works with a focus on this last domain have been proposed. Strategies like progressive refinements methods 2-4 or hierarchical radiosity [5][6][7] have been developed with the goal of quickly updating changes in illumination for a given demand. In the case of non-interactive radiosity animations, [8][9][10][11][12] where all time-dependent parameters can be known a priori, requirements are not the same as in the interactive case: there is not a high compromise on speeding updates of single frames. However, a large number of frames must be computed, maintaining a high-quality level of accuracy. Although in most cases interactive techniques could be adapted to animation purposes, a specific approach for animations can extract more benefits.In this paper we present the Multi-Frame Lighting Method, a M...

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“…More recently, Bekaert et al [1998] have presented an efficient algorithm that combines hierarchical and Monte Carlo radiosities. However, the stochastic nature of the algorithm makes it difficult to refine along shadow boundaries.…”

Section: Previous Workmentioning

confidence: 99%

Fast and accurate hierarchical radiosity using global visibility

1999

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Recent hierarchical global illumination algorithms permit the generation of images with a high degree of realism. Nonetheless, appropriate refinement of light transfers, high quality meshing, and accurate visibility calculation can be challenging tasks. This is particularly true for scenes containing multiple light sources and scenes lit mainly by indirect light. We present solutions to these problems by extending a global visibility data structure, the Visibility Skeleton. This extension allows us to calculate exact point-to-polygon form-factors at vertices created by subdivision. The structure also provides visibility information for all light interactions, allowing intelligent refinement strategies. High-quality meshing is effected based on a perceptually based ranking strategy which results in appropriate insertions of discontinuity curves into the meshes representing illumination. We introduce a hierarchy of triangulations that allows the generation of a hierarchical radiosity solution using accurate visibility and meshing. Results of our implementation show that our new algorithm produces high quality view-independent lighting solutions for direct illumination, for scenes with multiple lights and also scenes lit mainly by indirect illumination.

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Hierarchical Monte Carlo Radiosity

Cited by 29 publications

References 27 publications

State of the Art in Global Illumination for Interactive Applications and High‐quality Animations

State of the Art in Global Illumination for Interactive Applications and High‐quality Animations

Animating radiosity environments through the Multi‐Frame Lighting Method

Fast and accurate hierarchical radiosity using global visibility

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