用几何光学近似绘制离散参与介质
Rendering Discrete Participating Media with Geometrical Optics Approximation
摘要：
我们考虑由稀疏且随机分布的离散颗粒组成的参与介质中的光散射。预期颗粒尺寸的范围从波长的尺度到比波长大几个数量级的尺度，并且外观显示出与连续介质的光滑外观相反的明显的颗粒性。基于物理的合成这种外观的一个基本问题是确定每个局部区域中的必要光学特性。由于这些光学性质在空间上变化，我们诉诸几何光学近似（GOA），一个高效的替代严格的洛伦兹-米氏理论，定量表示单个粒子的散射。这使我们能够根据任何粒度分布快速计算体光学性质。然后，我们提出了一个实用的Monte Carlo渲染解决方案来解决离散参与介质中的能量传递。结果表明，第一次，我们提出的框架可以模拟广泛的离散参与介质具有不同程度的颗粒度和收敛到连续介质的颗粒浓度的增加。
英文摘要：
We consider the scattering of light in participating media composed of sparsely and randomly distributed discrete particles. The particle size is expected to range from the scale of the wavelength to the scale several orders of magnitude greater than the wavelength, and the appearance shows distinct graininess as opposed to the smooth appearance of continuous media. One fundamental issue in physically-based synthesizing this appearance is to determine necessary optical properties in every local region. Since these optical properties vary spatially, we resort to geometrical optics approximation (GOA), a highly efficient alternative to rigorous Lorenz-Mie theory, to quantitatively represent the scattering of a single particle. This enables us to quickly compute bulk optical properties according to any particle size distribution. Then, we propose a practical Monte Carlo rendering solution to solve the transfer of energy in discrete participating media. Results show that for the first time our proposed framework can simulate a wide range of discrete participating media with different levels of graininess and converges to continuous media as the particle concentration increases.
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