Looking good!
mgumley wrote:
Now I just need to figure out how to blend the materials between grass, dirt, and stone. 
.
.This is actually quite hard. I have written an article here that might help: https://books.google.co.uk/books?id=WNf ... &q&f=false
Note that it is a few years old and I don't necessarily stand by (or even remember?!) what I wrote, but it's a starting point.
The approach used in Cubiquity was more advanced and quite horribly complex, but did give nice control over the blending: http://www.cubiquity.net/cubiquity-for- ... l_set.html
See the result here: https://www.youtube.com/watch?v=auKomEGDNwA
Again I'm not sure I'd recommend it... you'll have to do some research and do read the (limited) PolyVox docs on texturing.