Extracting Microfacet‐based BRDF Parameters from Arbitrary Materials with Power Iterations

Dupuy, Jonathan; Heitz, Eric; Iehl, Jean‐Claude; Poulin, Pierre; Ostromoukhov, Victor

doi:10.1111/cgf.12675

Cited by 31 publications

(15 citation statements)

References 20 publications

(30 reference statements)

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“…• We use the technique described in Löw et al [35] to fit the MERL materials, thus finding the optimal parameters for the ABC model to represent them; • We apply our remapping ABC → GGX to the find a suitable representation of the materials in the GGX parameters space. As a further comparison, we show the fitting of the MERL materials to the GGX model, obtained using the method by Dupuy et al [38]. To display our results, we take advantage of the perceptual validation of the optimised surface and light direction suggested by [39] (see Figure 12).…”

Section: Results -Isotropic Brdf Models (Higher Dimensional Remapping)mentioning

confidence: 99%

“…The third column reports the scene rendered using the GGX model, using the parameters derived from our remapping ABC → GGX. As a further comparison, the last column reports the scene rendered using the GGX model, with the parameters derived from the fitting described in Dupuy et al [38]. Please see the supplementary material for the complete list of materials in the MERL dataset.…”

Section: User Studiesmentioning

confidence: 99%

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Perceptually Validated Cross-Renderer Analytical BRDF Parameter Remapping

Guarnera

Toscani

et al. 2020

IEEE Trans. Visual. Comput. Graphics

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Material appearance of rendered objects depends on the underlying BRDF implementation used by rendering software packages. A lack of standards to exchange material parameters and data (between tools) means that artists in digital 3D prototyping and design, manually match the appearance of materials to a reference image. Since their effect on rendered output is often non-uniform and counter intuitive, selecting appropriate parameterisations for BRDF models is far from straightforward. We present a novel BRDF remapping technique, that automatically computes a mapping (BRDF Difference Probe) to match the appearance of a source material model to a target one. Through quantitative analysis, four user studies and psychometric scaling experiments, we validate our remapping framework and demonstrate that it yields a visually faithful remapping among analytical BRDFs. Most notably, our results show that even when the characteristics of the models are substantially different, such as in the case of a phenomenological model and a physically-based one, our remapped renderings are indistinguishable from the original source model.

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Section: Results -Isotropic Brdf Models (Higher Dimensional Remapping)mentioning

confidence: 99%

Section: User Studiesmentioning

confidence: 99%

Perceptually Validated Cross-Renderer Analytical BRDF Parameter Remapping

Guarnera

Toscani

et al. 2020

IEEE Trans. Visual. Comput. Graphics

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“…We plan to validate whether other published BRDF models (e.g. Holzschuch and Pacanowski [HP17], Dupuy et al [DHI*15] or Bagher et al [BSH12]) lead to better fitting results, especially of the wavelength dependency of the backscattering and the Fresnel reflection.…”

Section: Discussionmentioning

confidence: 99%

Acquisition and Validation of Spectral Ground Truth Data for Predictive Rendering of Rough Surfaces

Clausen

Marroquim

Fuhrmann

2018

Computer Graphics Forum

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Physically based rendering uses principles of physics to model the interaction of light with matter. Even though it is possible to achieve photorealistic renderings, it often fails to be predictive. There are two major issues: first, there is no analytic material model that considers all appearance critical characteristics; second, light is in many cases described by only 3 RGB‐samples. This leads to the problem that there are different models for different material types and that wavelength dependent phenomena are only approximated. In order to be able to analyze the influence of both problems on the appearance of real world materials, an accurate comparison between rendering and reality is necessary. Therefore, in this work, we acquired a set of precisely and spectrally resolved ground truth data. It consists of the precise description of a new developed reference scene including isotropic BRDFs of 24 color patches, as well as the reference measurements of all patches under 13 different angles inside the reference scene. Our reference data covers rough materials with many different spectral distributions and various illumination situations, from direct light to indirect light dominated situations.

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“…Ngan et al [164] compared the accuracy of several fitted parametric models using the MERL database as input data [147]. As the parametric models seldom fit the measures reflectance exactly, important considerations for the fitting procedure are the choice of suitable metrics [19,164], for example perceptually motivated metrics, and the choice of non-linear optimization techniques [56,229].…”

Section: Fitting Parametric Models To Datamentioning

confidence: 99%

Physically Based Rendering of Synthetic Objects in Real Environments

Kronander¹

2015

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Description of the cover imageRendering of virtual furniture illuminated with spatially varying real world illumination captured in a physical environment at IKEA Communications AB.The virtual scene was modeled by Sören and Per Larsson. Physically based rendering of synthetic objects in real environmentsCopyright © 2015 Joel Kronander (unless otherwise noted) Division of Media and Information TechnologyDepartment of Science and Technology Campus Norrköping, Printed in Sweden by LiU-Tryck, Linköping, 2015 AbstractThis thesis presents methods for photorealistic rendering of virtual objects so that they can be seamlessly composited into images of the real world. To generate predictable and consistent results, we study physically based methods, which simulate how light propagates in a mathematical model of the augmented scene. This computationally challenging problem demands both efficient and accurate simulation of the light transport in the scene, as well as detailed modeling of the geometries, illumination conditions, and material properties. In this thesis, we discuss and formulate the challenges inherent in these steps and present several methods to make the process more efficient.In particular, the material contained in this thesis addresses four closely related areas: HDR imaging, IBL, reflectance modeling, and efficient rendering. The thesis presents a new, statistically motivated algorithm for HDR reconstruction from raw camera data combining demosaicing, denoising, and HDR fusion in a single processing operation. The thesis also presents practical and robust methods for rendering with spatially and temporally varying illumination conditions captured using omnidirectional HDR video. Furthermore, two new parametric BRDF models are proposed for surfaces exhibiting wide angle gloss. Finally, the thesis also presents a physically based light transport algorithm based on Markov Chain Monte Carlo methods that allows approximations to be used in place of exact quantities, while still converging to the exact result. As illustrated in the thesis, the proposed algorithm enables efficient rendering of scenes with glossy transfer and heterogenous participating media.v Populärvetenskaplig SammanfattningEn av de största utmaningarna inom datorgrafik är att syntetisera, eller rendera, fotorealistiska bilder. Fotorealistisk rendering används idag inom många tillämpningsområden såsom specialeffekter i film, datorspel, produktvisualisering och virtuell verklighet. I många praktiska tillämpningar av fotorealistisk rendering är det viktigt att kunna placera in virtuella objekt i fotografier, så att de virtuella objekten ser verkliga ut. IKEA-katalogen, till exempel, produceras i många olika versioner för att passa olika länder och regioner. Grunden till de flesta bilderna i katalogen är oftast densamma, men symboler och standardmått på möbler varierar ofta för olika versioner av katalogen. Istället för att fotografera varje version separat kan man använda ett grundfotografi och lägga in olika virtuella objekt såsom möbler...

show abstract

Extracting Microfacet‐based BRDF Parameters from Arbitrary Materials with Power Iterations

Cited by 31 publications

References 20 publications

Perceptually Validated Cross-Renderer Analytical BRDF Parameter Remapping

Perceptually Validated Cross-Renderer Analytical BRDF Parameter Remapping

Acquisition and Validation of Spectral Ground Truth Data for Predictive Rendering of Rough Surfaces

Physically Based Rendering of Synthetic Objects in Real Environments

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