A practical extension to microfacet theory for the modeling of varying iridescence

Belcour, Laurent; Barla, Pascal

doi:10.1145/3072959.3073620

Cited by 70 publications

(103 citation statements)

References 25 publications

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“…Since we rely on the evaluation of the integrated Fresnel term during the adding-doubling, we can use any model that replaces the Fresnel term. For example, it is possible to replace one of the evaluations of the FGD term by the model of Belcour and Barla [2017]. Similarly, we could incorporate gli ery appearance into our framework by using one of the available glint models [Jakob et al 2014].…”

Section: Discussion and Future Workmentioning

confidence: 99%

Efficient rendering of layered materials using an atomic decomposition with statistical operators

Belcour¹

2018

ACM Trans. Graph.

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Fig. 1. We introduce a BSDF model to render plane-parallel layered materials using an analysis of the directional statistics of light interaction with microfacet geometry and participating media. Our model closely matches the reference and supports an arbitrary number of textured layers while being energy conserving, free from heavy per-material precomputation, and compatible with real-time constraints.We derive a novel framework for the e cient analysis and computation of light transport within layered materials. Our derivation consists of two steps. First, we decompose light transport into a set of atomic operators that act on its directional statistics. Speci cally, our operators consist of re ection, refraction, sca ering, and absorption, whose combinations are su cient to describe the statistics of light sca ering multiple times within layered structures. We show that the rst three directional moments (energy, mean and variance) already provide an accurate summary. Second, we extend the adding-doubling method to support arbitrary combinations of such operators e ciently. During shading, we map the directional moments to BSDF lobes. We validate that the resulting BSDF closely matches the ground truth in a lightweight and e cient form. Unlike previous methods, we support an arbitrary number of textured layers, and demonstrate a practical and accurate rendering of layered materials with both an o ine and real-time implementation that are free from per-material precomputation.

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Section: Discussion and Future Workmentioning

confidence: 99%

Efficient rendering of layered materials using an atomic decomposition with statistical operators

Belcour¹

2018

ACM Trans. Graph.

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“…They precomputed a structural light texture, parameterized by the optical path difference. Belcour and Barla [BB17] used an Airy summation to take all light paths inside the thin‐film into account. Then, they considered the Fourier transformed reflectance in order to compute the response to an arbitrary spectral band.…”

Section: Related Workmentioning

confidence: 99%

“…Belcour and Barla [BB17] introduced an extension to micro‐facet theory for the rendering of iridescent effects caused by thin‐films of varying thickness on top of an arbitrarily rough base layer. If the features of the microfacet surface are assumed to be much larger than the wavelengths of visible light, diffraction effects can be neglected.…”

Section: Introductionmentioning

confidence: 99%

“…Until recently, it was neccessary to consider individual wavelengths separately in order to compute iridescent effects accurately. In their work, Belcour and Barla [BB17] introduced a method that can be evaluated in real‐time, using only an RGB light representation. However, their method exhibits the following limitation (see Figure 16 in [BB17]): With increasing surface roughness, the iridescent colors become over‐saturated in their real‐time image‐based lighting implementation in comparison to a path‐traced reference image.…”

Section: Introductionmentioning

confidence: 99%

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Real‐time Image‐based Lighting of Microfacet BRDFs with Varying Iridescence

Kneiphof

Golla

Klein

2019

Computer Graphics Forum

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Iridescence is a natural phenomenon that is perceived as gradual color changes, depending on the view and illumination direction. Prominent examples are the colors seen in oil films and soap bubbles. Unfortunately, iridescent effects are particularly difficult to recreate in real‐time computer graphics. We present a high‐quality real‐time method for rendering iridescent effects under image‐based lighting. Previous methods model dielectric thin‐films of varying thickness on top of an arbitrary micro‐facet model with a conducting or dielectric base material, and evaluate the resulting reflectance term, responsible for the iridescent effects, only for a single direction when using real‐time image‐based lighting. This leads to bright halos at grazing angles and over‐saturated colors on rough surfaces, which causes an unnatural appearance that is not observed in ground truth data. We address this problem by taking the distribution of light directions, given by the environment map and surface roughness, into account when evaluating the reflectance term. In particular, our approach prefilters the first and second moments of the light direction, which are used to evaluate a filtered version of the reflectance term. We show that the visual quality of our approach is superior to the ones previously achieved, while having only a small negative impact on performance.

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“…Also related is the work of Berlcour & Barla [2] that deals with rendering of iridescence caused by thin film of varying thickness (e.g. soap bubbles).…”

Section: Related Workmentioning

confidence: 99%

Real-time rendering of realistic surface diffraction with low rank factorisation

Toisoul

Ghosh

2017

Proceedings of the 14th European Conference on Visual Media Production (CVMP 2017)

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We propose a novel approach for real-time rendering of diffraction effects in surface reflectance in arbitrary environments. Such renderings are usually extremely expensive as they require the computation of a convolution at real-time framerates. In the case of diffraction, the diffraction lobes usually have high frequency details that can only be captured with high resolution convolution kernels which make calculations even more expensive. Our method uses a low rank factorisation of the diffraction lookup table to approximate a 2D convolution kernel by two simpler low rank kernels which allow the computation of the convolution at real-time framerates using two rendering passes. We show realistic renderings in arbitrary environments and achieve a performance from 50 to 100 FPS making possible to use such a technique in real-time applications such as video games and VR.

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A practical extension to microfacet theory for the modeling of varying iridescence

Cited by 70 publications

References 25 publications

Efficient rendering of layered materials using an atomic decomposition with statistical operators

Efficient rendering of layered materials using an atomic decomposition with statistical operators

Real‐time Image‐based Lighting of Microfacet BRDFs with Varying Iridescence

Real-time rendering of realistic surface diffraction with low rank factorisation

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