@youseeus

If someone want to get involved... i created a private repro at bitbucket

I'll be happy to see Your code even I'm not a programmer.
Of course if You have finish the real roof for Your house!
At that moment I'm in a process to learn basic 3D notions.
The way suggested by Emmanuel is correct with update to use Terran Generator.
My problem now is I don't know how to use java 3D principle BUT I will learn.