Yes, its very impressive. I actually could make it shorter, but I am learning while doing.
The most impressive thing is how easy they made it, I knew nothing about 3D, I picked many things up.
The workflow is very awesome.
But not all the magic is in the code, there are lots of options and shader code inside project files.
Also there are 2 python tools around it to batch convert g3d to dae (better collada) and creating splatter and heightmaps (which I am still learning).