Realistic Diffraction

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance. Antoine Toisoul and Abhijeet Ghosh. ACM Transactions on Graphics, 2017 (presentation at SIGGRAPH 2017).

Description

Realistic diffraction is an implementation of the paper Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance. Antoine Toisoul and Abhijeet Ghosh. ACM Transactions on Graphics, 2017. It allows :

• the computation of diffraction lookup tables given the HDR photograph of a diffraction pattern measured with a spectral filter
• the prefiltering of an environment map with a diffraction lookup table for real-time rendering of diffraction effects in arbitrary environments

The software requires OpenCV and has been tested with OpenCV 2.4.11.

A video of the renderings is available here

Usage

An example of how to compute a diffraction lookup table and the convolution are given in main.cpp. The function that computes the lookup table is given in huygens.cpp. The function that computes the prefiltering is given in convolution.cpp.

A few spectral measurements of diffraction patterns are provided in the data folder. Please adjust, the variables as follows depending on the spectral filter employed.

For the red spectral filter (Bragg.pfm, TV.pfm, holographic_paper.pfm) please use :

• float lambdaMeasurement = 0.65;
• float colorChannel = 2;

For the green spectral filter (HTC.pfm, LG.pfm) please use :

• float lambdaMeasurement = 0.53;
• float colorChannel = 1;

Citation

Please cite the following paper when using Realistic Diffraction :

Practical Acquisition and Rendering of Diffraction Effects in Surface Reflectance. 
Antoine Toisoul and Abhijeet Ghosh. ACM Transactions on Graphics,36(5), 2017.

Credits and License

Realistic Diffraction. Author : Antoine TOISOUL. Copyright © 2016 Antoine TOISOUL, Imperial College London. All rights reserved.

Realistic Diffraction is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Realistic Diffraction is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Contact

Antoine Toisoul : antoine.toisoul 'AT' telecom-paristech.org