Emmanuel, when you get to adding features to the Terrain Generator please consider these:

1. A highlighted point where the mouse is on the terrain.
Currently it's a huge guess where elevation will occur on large terrains. Sometimes far from where you thought you clicked.

2. At least a single level of undo (if that doesn't cause memory problems)

3. Pan left/right and up/down
This makes it easier to zoom into where you want, especially with larger terrains.

4. Keyboard keys to rotate/tilt and pan.
If you zoom in to far you can no longer place the mouse at the side to do that. I would suggest the arrow keys for rotate/tilt and ctrl+arrow keys for panning.

5. Elevation accuracy: if you can't zoom in far enough you have very little control over how much elevation a mouse movement will trigger.

6. Set a max height: this so you can limit elevation to, for example, a wall height from where it slopes down. Without reasonable accuracy this is currently very difficult. This would also solve 'starting with a set elevation': set the max and lift everything to that height.

I'm looking forward to see any or all in a next version!

Keet