Discrete stochastic microfacet models

Jakob, Wenzel; Hašan, Miloš; Yan, Ling‐Qi; Lawrence, Jason; Ramamoorthi, Ravi; Marschner, Steve

doi:10.1145/2601097.2601186

Cited by 71 publications

(93 citation statements)

References 36 publications

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“…[Jakob et al 2014] is concurrent work that also addresses the problem of glinty surfaces, using a stochastic approach. Rather than work from a normal map, that method models the surface as a procedural random collection of specular flakes that occur according to a particular normal distribution.…”

Section: Related Workmentioning

confidence: 99%

Rendering glints on high-resolution normal-mapped specular surfaces

et al. 2014

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our method binning reference time pixel intensity pixel normal distribution function Figure 1: A rendering of highly specular objects under point lighitng. A high-resolution normal map (2048 2 ) makes rendering impractical with standard techniques: the highlights are missed by naive pixel sampling. Left inset: Our solution is based on the concept of a pixel normal distribution function (P-NDF), which can be highly complex. Right inset: Our method is accurate even in a moving-light sequence. AbstractComplex specular surfaces under sharp point lighting show a fascinating glinty appearance, but rendering it is an unsolved problem. Using Monte Carlo pixel sampling for this purpose is impractical: the energy is concentrated in tiny highlights that take up a minuscule fraction of the pixel. We instead compute an accurate solution using a completely different deterministic approach. Our method considers the true distribution of normals on a surface patch seen through a single pixel, which can be highly complex. We show how to evaluate this distribution efficiently, assuming a Gaussian pixel footprint and Gaussian intrinsic roughness. We also take advantage of hierarchical pruning of position-normal space to rapidly find texels that might contribute to a given normal distribution evaluation. Our results show complex, temporally varying glints from materials such as bumpy plastics, brushed and scratched metals, metallic paint and ocean waves.

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Section: Related Workmentioning

confidence: 99%

Rendering glints on high-resolution normal-mapped specular surfaces

et al. 2014

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“…Jakob et al [JHY∗14] use a stochastic approach to simulate glittery effects using a statistical distribution of tiny, mirror‐like flakes. This method is memory‐efficient and temporally stable in animation.…”

Section: Related Workmentioning

confidence: 99%

A Stationary SVBRDF Material Modeling Method Based on Discrete Microsurface

Zhu

Wang

2019

Computer Graphics Forum

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Microfacet theory is commonly used to build reflectance models for surfaces. While traditional microfacet‐based models assume that the distribution of a surface's microstructure is continuous, recent studies indicate that some surfaces with tiny, discrete and stochastic facets exhibit glittering visual effects, while some surfaces with structured features exhibit anisotropic specular reflection. Accordingly, this paper proposes an efficient and stationary method of surface material modeling to process both glittery and non‐glittery surfaces in a consistent way. Our method comprises two steps: in the preprocessing step, we take a fixed‐size sample normal map as input, then organize 4D microfacet trees in position and normal space for arbitrary‐sized surfaces; we also cluster microfacets into 4D K‐lobes via the adaptive k‐means method. In the rendering step, moreover, surface normals can be efficiently evaluated using pre‐clustered microfacets. Our method is able to efficiently render any structured, discrete and continuous micro‐surfaces using a precisely reconstructed surface NDF. Our method is both faster and uses less memory compared to the state‐of‐the‐art glittery surface modeling works.

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“…This concept has also been tested successfully in real-time rendering [173]. Improved version, that includes discrete stochastic for random spatial variation of BRDF, is presented recently [174]. In order to solve antialiasing of surfaces using high-level of details using microfacet models at all scales Dupuy et al proposed Linear Efficient Antialiased Displacement and Reflectance (LEADR) Mapping [175].…”

Section: Bipv Facade Module To Building Scalementioning

confidence: 99%

State-of-the-art review of solar design tools and methods for assessing daylighting and solar potential for building-integrated photovoltaics

Jakica

2018

Renewable and Sustainable Energy Reviews

132

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Solar design can take many different forms across disciplines with different methodologies and goals, ranging from acquiring architectural visual effects to assessing illumination for daylighting and solar radiation potential on building surfaces for PV implementation. Furthermore, a capability of solar design methodologies and tools to accurately and time efficiently simulate light phenomena can greatly influence performance results and design decisions. This is especially important in complex cases such as dense urban settings with the significant surface shadowing, and vertical facades including daylighting devices and photovoltaics. Consequently, choosing a suitable approach and tool for each design phase is essential for achieving unique design and performance goals. This paper was carried out within the framework of IEA-PVPS Task 15 -BIPV and it aims to facilitate this decision for all parties involved in solar design process. Here presented, is an overview of almost 200 solar design tools, analyzing their numerous features regarding accuracy, complexity, scale, computation speed, representation as well as building design process integration in about 50 2D/3D, CAD/CAM and BIM software environments. Furthermore, tools from various fields have been analysed in a broad interdisciplinary context of solar design with a particular attention for being used for Daylighting and Building-Integrated Photovoltaics (BIPV) purposes. This approach should open many new perspectives on a potentially wider multidisciplinary usage and interpretation of solar design tools, sometimes well beyond their initial scope of work.

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Discrete stochastic microfacet models

Cited by 71 publications

References 36 publications

Rendering glints on high-resolution normal-mapped specular surfaces

Rendering glints on high-resolution normal-mapped specular surfaces

A Stationary SVBRDF Material Modeling Method Based on Discrete Microsurface

State-of-the-art review of solar design tools and methods for assessing daylighting and solar potential for building-integrated photovoltaics

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