Sometimes the same scene uses the same material, such as floor tiles and wall tiles, but the material on the wall looks very light, but the ground does not.

Materials are not an isolated set of parameters.

Take an object in reality, a stainless steel part in reality. It must be made of the right material, because it is real. But if you shoot with a camera, people with different photography skills will get different effects. Shooting in a gray factory building, shooting outdoors in sunny weather, and shooting with some lights in the studio is not a thing at all.

So besides the material itself, lighting and environment are also very important. Then there are AO, composition, and so on.

The relationship between light and shadow injects soul into the expression of materials. No lights, no highlights, no shadows, no stereoscopic effect, no texture. ...

Stainless steel, in particular, is highly reflective, and the surrounding reflective environment is completely different. If there is no reflection, it is dark all around, and it is also dead black.