Efficient Monte Carlo rendering with realistic lenses
Efficient Monte Carlo rendering with realistic lenses
复制标题
使用真实镜头进行高效蒙特卡罗渲染
DOI：
10.1111/cgf.12301
复制
发表时间：
2014
影响因子：
2.5
通讯作者：
C. Dachsbacher
中科院分区：
文献类型：
--
作者：
J. Hanika;C. Dachsbacher
在本文中，我们提出了一种新的方法来模拟成像的广泛的真实的世界的镜头在蒙特卡洛光线追迹框架。我们的方法避开了通过透镜系统追踪光线的开销，并且不需要制表。为此，我们首先提高多项式光学的精度，以紧密匹配地面真实光线追踪。其次，我们展示了光学系统的雅可比矩阵如何实现有效的重要性采样，这对于困难的路径至关重要，例如对隐藏在两侧透镜后面的光圈进行采样。我们的研究结果表明，这产生收敛的图像显着快于以前的方法，并准确地呈现复杂的透镜系统与简单的模型，例如薄透镜模型相比，可以忽略不计的开销。我们证明了我们的方法的实用性，将其纳入一个双向路径跟踪框架，并显示它如何可以提供复杂的光传输算法所需的信息。
In this paper we present a novel approach to simulate image formation for a wide range of real world lenses in the Monte Carlo ray tracing framework. Our approach sidesteps the overhead of tracing rays through a system of lenses and requires no tabulation. To this end we first improve the precision of polynomial optics to closely match ground‐truth ray tracing. Second, we show how the Jacobian of the optical system enables efficient importance sampling, which is crucial for difficult paths such as sampling the aperture which is hidden behind lenses on both sides. Our results show that this yields converged images significantly faster than previous methods and accurately renders complex lens systems with negligible overhead compared to simple models, e.g. the thin lens model. We demonstrate the practicality of our method by incorporating it into a bidirectional path tracing framework and show how it can provide information needed for sophisticated light transport algorithms.