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                                            Kanition

计划：掩膜遮挡函数推导

https://www.cs.cornell.edu/~srm/publications/EGSR07-btdf.pdf

计划：掩膜遮挡函数推导

关于G1的定义 https://github.com/kanition/pbrtbook/issues/150#issuecomment-1911686836

计划：掩膜遮挡函数推导

![FireShot Capture 001 - Notes for GGX paper - dydx - 博客园 - www cnblogs com](https://github.com/kanition/pbrtbook/assets/68691995/1f7735f8-6541-4446-a7fa-d24dc9fd8b51)

计划：掩膜遮挡函数推导

![IMG_20240130_201656.jpg](https://github.com/kanition/pbrtbook/assets/68691995/79bf628a-a731-4411-a57b-aea7bd35a8ec)

计划：掩膜遮挡函数推导

作者对Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs的解释，梳理思路很清晰 https://jcgt.org/published/0003/02/03/ https://jcgt.org/published/0003/02/03/presentation.pdf

计划：掩膜遮挡函数推导

找个合适的地方交代法向量积分区域可以缩减到半球空间而不改变值

计划：掩膜遮挡函数推导

D(w)和P22的关系推导 https://www.reedbeta.com/blog/slope-space-in-brdf-theory/

计划：掩膜遮挡函数推导

用雅克比矩阵变换坐标即可

计划：掩膜遮挡函数推导

8.5.2节推广至透射情况：全部max(·,0)项改绝对值项

微面模型补充推导

- [x] 8.5.2节推广至透射情况：全部max(·,0)项改绝对值项 - [ ] #145 - [x] 误差函数erf(x)换元写成erf(a)