There's texture gradient, which I'll explain in a second, and linear perspective, which I'll also explain in a second.
有纹理渐变(我将在第二部分中解释)和线性透视(我将在第二部分中解释)。
英语百科
Texture gradient
Texture gradient is the distortion in size which closer objects have compared to objects farther away. It also involves groups of objects appearing denser as they move farther away. Also could be explained by noticing a certain amount of detail depending on how close something is, giving a sense of depth perception.
There are three main forms of texture gradient: density, perspective, and distortion of texture elements.