UE学习:

The materials made up of layers,and these layers form what's called a physically based rendered(PBR or material)

We accomplished this through four basic layers of a material:

• first he base color or a base texture.
• second,whether or not the material is metallic or metal
• third,how rough the material is,is the material very sommoth?Does it have roughness to it?And this helps decide how the light spreads over the material.
• lastly,this one is not always required,but a normal map and a normal map will allow us to simulate depth to our material.