Godot 4: 3D grid shader (tutorial)

Hi everybody! A few months ago, I created a tutorial for generating a simple two-dimensional grid, and recently I thought it would definitely be useful if we could do the same as a projection into the third dimension. The algorithm for the grid itself will remain the same, but we will add elements like a 3D camera, projected UVs, and so on. Let's take a look at how such a shader works.