The 16 types of cubes at the base 基础的16种正方体
When I was drawing the human body, I was very troubled by drawing geometric figures, so I got the basic 16 types of cubes. If the cuboid is rectangular, please adjust it according to the deformation.

在画人体的时候我对画几何图形很苦恼,所以弄了基础的16种正方体。长方体的话请根据变形自行调节。

Cube 正方体