What's the difference between 3D and 2D?

2D is flat and 3D is solid. 2D can also produce stereoscopic effect, but it is not as good as 3D. It is difficult to make a pure plane effect in 3D, and it all looks three-dimensional. 2D: 2D, plane, 3D: 3D, 3D is long and wide, and 3D is long, wide and high. 2D is generally hand-drawn, 3D is modeling, and there are many effects of 2D simulating 3D. Cartographers all represent 3D space on 2D, which is often called vividness. Draw a three-dimensional effect on flat paper. A typical example of 2D games is that we often play minesweeping, solitaire and even liankan. The drawing method of this kind of games is only drawing with pixel plane or vector (that is, drawing on the rectangular coordinates of the x.y plane). Typical examples of 3D games are CS, Need for Speed, and even Doom Warrior. The drawing method of this kind of game is to directly control the hardware such as graphics card with code, and get a seemingly realistic three-dimensional image through complex three-dimensional geometric operation.