Level Set Hair Shell

发件人 Shading

from PIXAR's paper

发件人 Shading

 

This slice of hair shell is based on FMM (Fast Marching Method) to obain a level set function in order to get a "imaginary" curve normal for hair shading similar to "Volumetric Methods for Simulation and Rendering of Hair" from PIXAR studio. But I really do not know whether we need this because pbr hair rendering do not need normal at all, this direction is pixar-only. I have also implement the Marschner's model, viewed the dual scattering published on Siggraph 2008, but I am still confused with the real need of production.

这个2D切片是基于FMM的Level Set求解Density函数求得的，等同于PIXAR的《Volumetric Methods for Simulation and Rendering of Hair》这篇文章中说的方法。不过我依旧感到很困惑，真正的生产需求是什么，需要什么样的技术才能满足效果需求。Marschner的物理模型我也做了，今年Siggraph 08的波恩大学的双向散射毛发渲染我也看了，感觉和生产真的差距还是太大。

说是要阴影，好啊，Deep Shadow可以，可是身体上的bias数值又不对。RT吧，不是不行，只是这个速度实在是不可接受。连添加杂色都不好添加，建模也不好建，动力学部分还需要Character TD多进修进修，总之，路漫漫啊。