Also make sure the surface normals are pointing outwards. 也確定表面的法線(xiàn)指向外面。
Then these normals are used to recover the surface reflectance by minimizing the fitting error of diffuse and specular reflectance model. 然后根據求出的法線(xiàn)用全局優(yōu)化的迭代方法來(lái)恢復物體的材質(zhì)。