Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Antoine Toisoul; Abhijeet Ghosh

doi:10.1145/3012001

journal article Jul 25, 2017

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

Antoine Toisoul

Abhijeet Ghosh

ACM Transactions on Graphics Vol. 36 No. 5 pp. 1-16 · Association for Computing Machinery (ACM)

View at Publisher Save 10.1145/3012001

Abstract

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. Second, 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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Metrics

31

Citations

48

References

Details

Published: Jul 25, 2017
Vol/Issue: 36(5)
Pages: 1-16
License: View

Authors

A

Antoine Toisoul

Imperial College London, UK

A

Abhijeet Ghosh

Imperial College London, UK

Funding

Royal Society Award: Wolfson Research Merit Award

EPSRC CDT Award: HiPEDS EP/L016796/1

EPSRC Award: Fellowship EP/N006259/1

Cite This Article

Antoine Toisoul, Abhijeet Ghosh (2017). Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance. ACM Transactions on Graphics, 36(5), 1-16. https://doi.org/10.1145/3012001

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance

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