# 高光 BSDF

## 输入

Hint

To compute this value for a realistic material with a known index of refraction, you may use this special case of the Fresnel formula: $$specular = ((ior - 1)/(ior + 1))^2$$

• 水： ior = 1.33， 镜面 = 0.02

• 玻璃： ior = 1.5， 镜面反射 = 0.04

• 钻石: 折射率 = 2.417, 反射率 = 0.17

Hint