Precomputed Lens Transport Maps
Yang Chen, Xiaochun Tong, Afet Abzar, Leo Hanxu, Matthew Avolio, Toshiya Hachisuka

TL;DR
This paper presents a precomputed, wavelength-aware lens model that accurately simulates complex optical effects like chromatic aberration and lens flares while being significantly faster than traditional ray tracing.
Contribution
It introduces a novel precomputed model combining wavelength inputs with Fresnel coefficients, improving accuracy and efficiency over prior polynomial and neural models.
Findings
Achieves higher accuracy than polynomial baselines.
Is an order of magnitude faster than brute force ray tracing.
Effectively captures chromatic aberration, lens flares, and other optical effects.
Abstract
Accurate real-time simulation of lens optics remains challenging due to the computational expense of full ray tracing and the limitations of existing approximations. The commonly used pinhole model and thin-lens model ignore many optical effects seen in real-world lens systems such as distortion and chromatic aberration. Prior polynomial models approximate a mapping between incident rays and exitant rays through a lens system per wavelength. Prior neural models improve the accuracy of this mapping and also capture wavelength-dependent variations (e.g., chromatic aberration) by integrating wavelength as an input to a unified neural network. Common to those prior models is that they omit Fresnel intensity throughput, precluding accurate simulation of internal reflections and lens flares. We introduce a precomputed lens model that combines wavelength-aware inputs with Fresnel intensity…
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