I am not using voxel's I am using height map. I am using a 2D grid with values that represent height. Then I am using a simple square tile with 4 vertices that are altered to the values in the grid and properly connected to the tiles around it.

Unlike my previous attempt at a terrain generation system that used square tiles with 100 vertices that required complex algorithms for adjusting them properly. My new method breaks it down to a simple form that can more easily be handled.

As far a manipulating the terrain was just a thought. I currently have no defined use for the terrain generation so no requirements of its capabilities need to be met. However I would like to create the system as flexible as possible.

Thank's everyone for all of the suggestions. They are great and I plan to look into each of them.