Making terrain solid

I know there is tutorials on how to implement physics into the terrain but i don’t have a height map or anything like that. i made the terrain completely in the jmonkey sdk. how do i make this terrain solid. i have box boxes and spheres solid but i don’t know how to make my terrain solid.

never mind i went to the jmonkey irc chat and they helped me there. i dont know how to close a topic but i dont need this help anymore. thanks