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Leonardo Scandolo, Sungkil Lee, and Elmar Eisemann

Computer Graphics Forum (Proc. EGSR'18), 37(4), 167–176, 2018.
Far-field diffraction can be evaluated using the Discrete Fourier Transform (DFT) in image space but it is costly due to its dense sampling. We propose a technique based on a closed-form solution of the continuous Fourier transform for simple vector primitives (quads) and propose a hierarchical and progressive evaluation to achieve real-time performance. Our method is able to simulate diffraction effects in optical systems and can handle varying visibility due to dynamic light sources. Furthermore, it seamlessly extends to near-field diffraction. We show the benefit of our solution in various applications, including realistic real-time glare and bloom rendering.
Paper preprints, slides, supplementary materials, and Google Scholar entry
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@ARTICLE{scandolo18:qft, title={{Quad-Based Fourier Transform for Efficient Diffraction Synthesis}}, author={Leonardo Scandolo and Sungkil Lee and Elmar Eisemann}, journal={{Computer Graphics Forum (Proc. EGSR'18)}}, volume={37}, number={4}, pages={167--176}, year={2018} }

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