Cosine lobes for interactive direct lighting in dynamic scenes

Meunier, Sylvain; Perrot, Romuald; Aveneau, Lilian; Méneveaux, Daniel; Ghazanfarpour, Djamchid

doi:10.1016/j.cag.2010.08.002

Cited by 6 publications

(5 citation statements)

References 39 publications

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“…Using methods such as distributed ray tracing [CPC84], which can amortize the cost of cache lookups over many samples, can also alleviate the problem. Also, sampling efficiency could be increased if the BRDF was to be represented by cosine lobes, then samples could be drawn from an approximate cosine lobe product (see [MPA*10]). This is not currently implemented as this requires the BRDFs to be fitted to a cosine lobe representation as a pre‐process, which is not always feasible for a general rendering system.…”

Section: Discussionmentioning

confidence: 99%

“…LaFortune et al [LFTG97] also used several cosine lobes to represent a BRDF. All the components of the rendering equation were approximated as cosine lobes by Meunier et al [MPA*10], who used an approximation of the product of several lobes when shading. However, this cannot be used in an unbiased context due to the approximations in the model, that radiance is assumed to come only from spherical light sources, and also that this requires the BRDF to be represented as a set of cosine lobes, which is often unfeasible in rendering systems.…”

Section: Related Workmentioning

confidence: 99%

“…These are well understood, and are steerable with intuitive parameters. The generalized cosine lobe model is similar to the LaFortune BRDF [LFTG97] and the cosine lobe rendering model [MPA*10]. In the LaFortune BRDF, the cosine lobes are fitted to data as a pre‐process, and in the rendering model many assumptions are made about the geometry and light sources, and this does not take into account indirect lighting.…”

Section: The Significance Cachementioning

confidence: 99%

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A Significance Cache for Accelerating Global Illumination

Bashford-Rogers¹,

Debattista²,

Chalmers³

2012

Computer Graphics Forum

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Rendering using physically based methods requires substantial computational resources. Most methods that are physically based use straightforward techniques that may excessively compute certain types of light transport, while ignoring more important ones. Importance sampling is an effective and commonly used technique to reduce variance in such methods. Most current approaches for physically based rendering based on Monte Carlo methods sample the BRDF and cosine term, but are unable to sample the indirect illumination as this is the term that is being computed. Knowledge of the incoming illumination can be especially useful in the case of hard to find light paths, such as caustics or scenes which rely primarily on indirect illumination. To facilitate the determination of such paths, we propose a caching scheme which stores important directions, and is analytically sampled to calculate important paths. Results show an improvement over BRDF sampling and similar illumination importance sampling.

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Section: Discussionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: The Significance Cachementioning

confidence: 99%

See 1 more Smart Citation

A Significance Cache for Accelerating Global Illumination

Bashford-Rogers¹,

Debattista²,

Chalmers³

2012

Computer Graphics Forum

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“…In France, such representations have been used for fitting image-based data [91], and for interactive rendering [92] for instance. N. Noé and B. Péroche have employed a hierarchical approach and locally supported functions [93].…”

Section: Brdf Parameterization and Fittingmentioning

confidence: 99%

Modeling, measuring, and using BRDFs: significant French contributions

et al. 2019

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The scattering of light by a surface is described by the Bidirectional Reflectance Distribution Function (BRDF). Unfortunately, this function cannot be straightforwardly acquired nor modeled. French researchers have proposed interesting contributions in the field, with several models and accurate experimental systems. For instance, the National Metrological Institute (LNE-CNAM) has implemented the best angular resolution goniospectrophotometer (0.015 o ). Modeling the BRDF has also been deeply studied in France, especially with the microfacet theory these recent years, a better understanding of the shadowing/masking function, new general distribution functions, visible normals, interfaced Lambertian microfacets and analysis concerning light multiple reflections. This paper proposes a state of the art concerning some significant French contributions in these fields.

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“…Meunier et al (Meunier et al, 2010) explain how cosine lobes can be used to represent each term of the rendering equation. The use of a cosine lobe representation for compactly representing a reflectance function is common.…”

Section: Related Workmentioning

confidence: 99%

Interactive Relighting of Virtual Objects under Environment Lighting

Michiels¹,

Put²,

Bekaert³

2015

Proceedings of the 10th International Conference on Computer Graphics Theory and Applications

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Abstract:Current relighting applications often constrain one or several factors of the rendering equation to keep the rendering speed real-time. For example, visibility is often precalculated and animations are not allowed, changes in lighting are limited to simple rotation or the lighting is not very detailed. Other techniques compromise on quality and often coarsely tabulate BRDF functions. In order to solve these problems, some techniques have started to use spherical radial basis functions. However, solving the triple product integral does not guarantee interactivity. In order to dynamically change lighting conditions or alter scene geometry and materials, these three factors need to be converted to the SRBF representation in a fast manner. This paper presents a method to perform the SRBF data construction and rendering in real-time. To support dynamic high-frequency lighting, a multiscale residual transformation algorithm is applied. Area lights are detected through a peak detection algorithm. By using voxel cone tracing and a subsampling scheme, animated geometry casts soft shadows dynamically. We demonstrate the effectiveness of our method with a real-time application. Users can shine with multiple light sources onto a camera and the animated virtual scene is relit accordingly.

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Cosine lobes for interactive direct lighting in dynamic scenes

Abstract: Many rendering systems rely on spherical harmonics or wavelets that provide a mean to

Cited by 6 publications

References 39 publications

A Significance Cache for Accelerating Global Illumination

A Significance Cache for Accelerating Global Illumination

Modeling, measuring, and using BRDFs: significant French contributions

Interactive Relighting of Virtual Objects under Environment Lighting

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