**Lambertian shading**
[Directional light](https://texonom.com/directional-light-744a092c6b7c46eab2e3f5423873430b) 


## matte
**depends on direction of light and normal, not viewer**
[Diffuse Reflection](https://texonom.com/diffuse-reflection-11ede68008204ba0bb3d77d33c427e9f) 
램버시안 반사율을 갖는 표면은, 관찰자가 바라보는 각도와 관계없이 같은 겉보기 밝기를 갖는다
물체 표면의 휘도가 등방성을 가질 때 그 표면이 램버시안 반사율을 갖는다고 한다
Lambertian model assumes that incoming light is emitted uniformly in all directions, so the viewingangle does not matter
The angle of incoming light determines how much light actually hits an area of surface








