A practical stochastic algorithm for rendering mirror-like flakes

Atanasov, Asen; Koylazov, Vladimir

doi:10.1145/2897839.2927391

Cited by 12 publications

(10 citation statements)

References 3 publications

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“…They calculate the ratio between the number of facets correctly oriented and the total number of microfacets inside P. For all the previous cited methods, the accurate P-NDF estimation entails high computation cost and thus none of them is applicable to real-time rendering. Some methods [AK16,WWH18] improve performance, but still not sufficiently to permit high performance. Conversely, Zirr and Kaplanyan [ZK16] reach real-time performance by making use of a MIP hierarchy instead of a complex data structure.…”

Section: Previous Workmentioning

confidence: 99%

Procedural Physically based BRDF for Real‐Time Rendering of Glints

Chermain

Sauvage

Dischler

et al. 2020

Computer Graphics Forum

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microfacet density ρ exp(20) exp(35) ∞ Figure 1: Left: Sponza scene with sparkling fabrics and stones is rendered on an NVIDIA GeForce RTX 2080 (3.0 ms/frame). Right: A sparkling plane perpendicular to the camera with specular microfacet density increasing from left to right. Top right: our physically based BRDF (2.5 ms/frame) converges to Cook and Torrance's BRDF (0.4 ms/frame), which assumes an infinite number of microfacets. Bottom right: the state-of-the-art method [ZK16] (1.3 ms/frame) is not physically based and does not converge to the BRDF of Cook and Torrance.

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Section: Previous Workmentioning

confidence: 99%

Procedural Physically based BRDF for Real‐Time Rendering of Glints

Chermain

Sauvage

Dischler

et al. 2020

Computer Graphics Forum

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“…Importance sampling is also not optimal, as non-contributing reflectors may inadvertently be sampled. The extension proposed by Atanasov and Koylazov [AK16] alleviates this issue, at the price of going through all the flakes falling into a footprint, which is inefficient. Other works concentrate on improving performance [WWH18].…”

Section: Glint Integratorsmentioning

confidence: 99%

“…To our knowledge, no other method has such a simple and efficient sampling procedure. Other methods either disregard the observation direction when sampling the patch [YHJ * 14, JHY * 14, YHMR16,CCM18], or need to walk through all normals if they want to do it [AK16] (Figure 8), which is inefficient.…”

Section: Importance Sampling the Patch-brdfmentioning

confidence: 99%

Glint Rendering based on a Multiple‐Scattering Patch BRDF

Chermain

Claux

Mérillou

2019

Computer Graphics Forum

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Rendering materials such as metallic paints, scratched metals and rough plastics requires glint integrators that can capture all micro‐specular highlights falling into a pixel footprint, faithfully replicating surface appearance. Specular normal maps can be used to represent a wide range of arbitrary micro‐structures. The use of normal maps comes with important drawbacks though: the appearance is dark overall due to back‐facing normals and importance sampling is suboptimal, especially when the micro‐surface is very rough. We propose a new glint integrator relying on a multiple‐scattering patch‐based BRDF addressing these issues. To do so, our method uses a modified version of microfacet‐based normal mapping [SHHD17] designed for glint rendering, leveraging symmetric microfacets. To model multiple‐scattering, we re‐introduce the lost energy caused by a perfectly specular, single‐scattering formulation instead of using expensive random walks. This reflectance model is the basis of our patch‐based BRDF, enabling robust sampling and artifact‐free rendering with a natural appearance. Additional calculation costs amount to about 40% in the worst cases compared to previous methods [YHMR16, CCM18].

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“…Atanasov et al [AK16] improve this work for faster computations and heavy-tailed microfacet distributions.…”

Section: Glint Renderingmentioning

confidence: 99%