A generic real-time rendering approach for structural colors

Imura, Masataka; Oshiro, Osamu; Saeki, Masahiko; Manabe, Yoshitsugu; Chihara, Kazuo; Yasumuro, Yoshihiro

doi:10.1145/1643928.1643952

“…Granier and Heidrich [2003] have also proposed a simplified RGB-based BRDF model for modeling iridescence in layered materials. Imura et al [2009] have proposed rendering structural colors in reflectance due to thin film or multi-layer interference as well as diffraction in a unified framework of optical path differences in microstructure. Belcour and Barla [2017] have recently proposed an extension for microfacet BRDFs based on analytic spectral integration to accurately model thin film interference due to varying thin film thickness over a rough surface.…”

Section: Other Wave Effectsmentioning

confidence: 99%

Acquiring spatially varying appearance of printed holographic surfaces

Toisoul

¹

,

Dhillon

²

,

Ghosh

³

2018

ACM Trans. Graph.

7

0

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We present two novel and complimentary approaches to measure diffraction effects in commonly found planar spatially varying holographic surfaces. Such surfaces are increasingly found in various decorative materials such as gift bags, holographic papers, clothing and security holograms, and produce impressive visual effects that have not been previously acquired for realistic rendering. Such holographic surfaces are usually manufactured with one dimensional diffraction gratings that are varying in periodicity and orientation over an entire sample in order to produce a wide range of diffraction effects such as gradients and kinematic (rotational) effects. Our proposed methods estimate these two parameters and allow an accurate reproduction of these effects in real-time. The first method simply uses a point light source to recover both the grating periodicity and orientation in the case of regular and stochastic textures. Under the assumption that the sample is made of the same repeated diffractive tile, good results can be obtained using just one to five photographs on a wide range of samples. The second method is based on polarization imaging and enables an independent high resolution measurement of the grating orientation and relative periodicity at each surface point. The method requires a minimum of four photographs for accurate results, does not assume repetition of an exemplar tile, and can even reveal minor fabrication defects. We present point light source renderings with both approaches that qualitatively match photographs, as well as real-time renderings under complex environmental illumination.

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“…Granier and Heidrich [2003] have also proposed a simplified RGB-based BRDF model for modeling iridescence in layered materials. Imura et al [2009] have proposed rendering structural colors in reflectance due to thin film or multi-layer interference as well as diffraction in a unified framework of optical path differences in microstructure. Also related is the work of Hullin et al [2010] who employed spectral BRDF measurements for modeling bispectral materials exhibiting fluorescence.…”

Section: Other Wave Effectsmentioning

confidence: 99%

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

ToisoulAntoine

¹

,

GhoshAbhijeet

²

2017

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We propose two novel contributions for measurement based rendering of diffraction effects in surface reflectance of planar homogeneous diffractive materials. As a general solution for commonly manufactured materials, we propose a practical data-driven rendering technique and a measurement approach to efficiently render complex diffraction effects in real-time. Our measurement step simply involves photographing a planar diffractive sample illuminated with an LED flash. Here, we directly record the resultant diffraction pattern on the sample surface due to a narrow band point source illumination. Furthermore, we propose an efficient rendering method that exploits the measurement in conjunction with the Huygens-Fresnel principle to fit relevant diffraction parameters based on a first order approximation. Our proposed data-driven rendering method requires the precomputation of a single diffraction look up table for accurate spectral rendering of complex diffraction effects. Secondly, for sharp specular samples, we propose a novel method for practical measurement of the underlying diffraction grating using out-of-focus "bokeh" photography of the specular highlight. We demonstrate how the measured bokeh can be employed as a height field to drive a diffraction shader based on a first order approximation for efficient real-time rendering. Finally, we also drive analytic solutions for a few special cases of diffraction from our measurements and demonstrate realistic rendering results under complex light sources and environments.

show abstract

“…Granier and Heidrich [2003] have also proposed a simplified RGB-based BRDF model for modeling iridescence in layered materials. Imura et al [2009] have proposed rendering structural colors in reflectance due to thin film or multi-layer interference as well as diffraction in a unified framework of optical path differences in microstructure. Also related is the work of Hullin et al [2010] who employed spectral BRDF measurements for modeling bispectral materials exhibiting fluorescence.…”

Section: Other Wave Effectsmentioning

confidence: 99%

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Toisoul

¹

,

Ghosh

²

2017

View full text Add to dashboard Cite

We propose two novel contributions for measurement based rendering of diffraction effects in surface reflectance of planar homogeneous diffractive materials. As a general solution for commonly manufactured materials, we propose a practical data-driven rendering technique and a measurement approach to efficiently render complex diffraction effects in real-time. Our measurement step simply involves photographing a planar diffractive sample illuminated with an LED flash. Here, we directly record the resultant diffraction pattern on the sample surface due to a narrow band point source illumination. Furthermore, we propose an efficient rendering method that exploits the measurement in conjunction with the Huygens-Fresnel principle to fit relevant diffraction parameters based on a first order approximation. Our proposed data-driven rendering method requires the precomputation of a single diffraction look up table for accurate spectral rendering of complex diffraction effects. Secondly, for sharp specular samples, we propose a novel method for practical measurement of the underlying diffraction grating using out-of-focus "bokeh" photography of the specular highlight. We demonstrate how the measured bokeh can be employed as a height field to drive a diffraction shader based on a first order approximation for efficient real-time rendering. Finally, we also drive analytic solutions for a few special cases of diffraction from our measurements and demonstrate realistic rendering results under complex light sources and environments.

show abstract

A generic real-time rendering approach for structural colors

Cited by 15 publications

References 14 publications

Acquiring spatially varying appearance of printed holographic surfaces

Acquiring spatially varying appearance of printed holographic surfaces

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

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