Does anyone know how you can make caves and rocks easily? Is there some trick for it? I tried to make a cave from starting with a simple block and using vertex manipulation, but that doesn't work well, because I don't know how to put in an extra vertex.
I mean, when I try to manipulate a block into a cave im still stuck with 8 vertices (because a block only has 8 vertices) but a cave requires a lot more of them.
(this might be a good idea for a tutorial, too)