Rendering biological iridescences with RGB-based renderers

Sun, Yinlong

doi:10.1145/1122501.1122506

“…1999a;1999b] have extensively studied full spectral rendering for modeling iridescence due to thin film interference. In subsequent work, Sun [2006] proposed an RGB-based renderer for efficient simulation of biological iridescence. Granier and Heidrich [2003] have also proposed a simplified RGB-based BRDF model for modeling iridescence in layered materials.…”

Section: Other Wave Effectsmentioning

confidence: 99%

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Toisoul

¹

,

Ghosh

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.

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“…1999a;1999b] have extensively studied full spectral rendering for modeling iridescence due to thin film interference. In subsequent work, Sun [2006] proposed an RGB-based renderer for efficient simulation of biological iridescence. Granier and Heidrich [2003] have also proposed a simplified RGB-based BRDF model for modeling iridescence in layered materials.…”

Section: Other Wave Effectsmentioning

confidence: 99%

Practical acquisition and rendering of diffraction effects in surface reflectance

Toisoul¹,

Ghosh²

2017

TOG

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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.

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“…Since this approach is limited to low order spherical harmonics, it may be inappropriate for BRDFs produced by complex biological nanostructures. Finally, Sun [Sun06] describes a method for interactive rendering of biological iridescences, but his approach is restricted to multilayer thin films. Their method is based on storing textures representing OPDs to compute interference.…”

Section: Previous Workmentioning

confidence: 99%

Interactive Diffraction from Biological Nanostructures

Dhillon

¹

,

Teyssier

²

,

Single

³

et al. 2014

Computer Graphics Forum

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PROBLEM(a) Xenopeltis (b) Its nanostructure• Rendering structural colors due to diffraction.• Using actual measured biological nanostructures.• At interactive rates.Challenges are :1. Modelling the statistical distribution of the height bumps for a "general" nanostructure. 2. Performing complex computations in real-time at high resolution. CONTRIBUTIONS• A method to render structural colors due to diffraction gratings directly based on physical measurements with atomic force microscopy (No assumptions about the distribution).• An algorithm for interactive rendering leveraging precomputed look-up tables. RESULTS Elaphe nanostructure(b) Convergence of the Taylor series with higher values for N for Elaphe nanostructure. (e) Effects of different λ step-size on numerical integration.

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Rendering biological iridescences with RGB-based renderers

Cited by 47 publications

References 55 publications

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Practical acquisition and rendering of diffraction effects in surface reflectance

Interactive Diffraction from Biological Nanostructures

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