i have seen some thing that can be in.
when you cut a char and it only hits the hip, you can continu living but can't stant anymore.
just like when freeza cuts his self in half
you can only move by flying
and about the trees, wy not animating it so they can be cutted but after being cut, the upper part disapear so it doesn't get in your way.
and the mountains can't be cut but the disk go's trow the mounians, better to code and better to do.