Imperial College London
Alternate

ProfessorAbhijeetGhosh

Faculty of Engineering, Department of Computing

Professor of Graphics and Imaging
 
 
 
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Contact

 

+44 (0)20 7594 8351abhijeet.ghosh Website

 
 
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Location

 

376Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Toisoul:2017:10.1145/3012001,
author = {Toisoul, A and Ghosh, A},
doi = {10.1145/3012001},
journal = {ACM Transactions on Graphics},
title = {Practical acquisition and rendering of diffraction effects in surface reflectance},
url = {http://dx.doi.org/10.1145/3012001},
volume = {36},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We propose two novel contributions for measurement based rendering ofdiffraction effects in surface reflectance of planar homogeneous diffractivematerials. As a general solution for commonly manufactured materials, wepropose a practical data-driven rendering technique and a measurementapproach to efficiently render complex diffraction effects in real-time. Ourmeasurement step simply involves photographing a planar diffractive sam-ple illuminated with an LED flash. Here, we directly record the resultantdiffraction pattern on the sample surface due to a narrow band point sourceillumination. Furthermore, we propose an efficient rendering method thatexploits the measurement in conjunction with the Huygens-Fresnel principleto fit relevant diffraction parameters based on a first order approximation.Our proposed data-driven rendering method requires the precomputationof asinglediffraction look up table for accurate spectral rendering of com-plex diffraction effects. Secondly, for sharp specular samples, we proposea novel method for practical measurement of the underlying diffractiongrating using out-of-focus “bokeh” photography of the specular highlight.We demonstrate how the measured bokeh can be employed as a heightfield to drive a diffraction shader based on a first order approximation forefficient real-time rendering. Finally, we also drive analytic solutions for afew special cases of diffraction from our measurements and demonstraterealistic rendering results under complex light sources and environments.
AU  - Toisoul,A
AU  - Ghosh,A
DO  - 10.1145/3012001
PY  - 2017///
SN  - 1557-7368
TI  - Practical acquisition and rendering of diffraction effects in surface reflectance
T2  - ACM Transactions on Graphics
UR  - http://dx.doi.org/10.1145/3012001
UR  - http://hdl.handle.net/10044/1/48262
VL  - 36
ER  -
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