Practical Rendering of Multiple Scattering Effects in Participating Media
Practical Rendering of Multiple Scattering Effects in Participating Media
复制标题
参与媒体中多重散射效果的实际渲染
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Nayar
中科院分区：
文献类型：
--
作者：
Simon Premoze;M. Ashikhmin;R. Ramamoorthi;S. Nayar
体积光传输效应对于许多材质（如皮肤、烟、云、雪或水）都很重要。特别是，必须考虑光在体积内的多次散射。虽然可以使用体积蒙特卡罗或有限元技术来模拟这种介质，但这些方法在计算上非常昂贵。另一方面，到目前为止，简单的分析模型仅限于均匀和/或光学致密介质，不能很容易地扩展到包括强烈的方向性效应和可见性在空间变化的体积。我们提出了一个实用的方法来渲染体积的影响，包括多次散射。我们显示了一个表达式的点扩散函数，捕捉由于多重散射的辐射模糊。我们开发了一个通用的框架，将这个点扩散函数，同时考虑非均匀介质-这个框架也可以与其他分析多次散射模型。
Volumetric light transport effects are significant for many materials like skin, smoke, clouds, snow or water. In particular, one must consider the multiple scattering of light within the volume. While it is possible to simulate such media using volumetric Monte Carlo or finite element techniques, those methods are very computationally expensive. On the other hand, simple analytic models have so far been limited to homogeneous and/or optically dense media and cannot be easily extended to include strongly directional effects and visibility in spatially varying volumes. We present a practical method for rendering volumetric effects that include multiple scattering. We show an expression for the point spread function that captures blurring of radiance due to multiple scattering. We develop a general framework for incorporating this point spread function, while considering inhomogeneous media - this framework could also be used with other analytic multiple scattering models.