Level Set Hair Shell

寄件者 Shading

from PIXAR's paper

寄件者 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.

這個2D切片是基於FMM的Level Set求解Density函數求得的，等同於PIXAR的《Volumetric Methods for Simulation and Rendering of Hair》這篇文章中說的方法。不過我依舊感到很困惑，真正的生產需求是什麼，需要什麼樣的技術才能滿足效果需求。Marschner的物理模型我也做了，今年Siggraph 08的波恩大學的雙向散射毛髮渲染我也看了，感覺和生產真的差距還是太大。

說是要陰影，好啊，Deep Shadow可以，可是身體上的bias數值又不對。RT吧，不是不行，只是這個速度實在是不可接受。連添加雜色都不好添加，建模也不好建，動力學部分還需要Character TD多進修進修，總之，路漫漫啊。