The Save Terrain plugin button allows you to save your terrain into a script. The script is just used to hold the text. Running the script will not do anything but shout errors. Select the script with ...

Procedural Terrain Generator for Roblox This is a procedural terrain generator, that doesn't utilize default Roblox terrain. It's designed to be orthogonal and easy to integrate into other projects.

Well, the developers have decided to evolve Roblox both graphically and creatively with the new Smooth Terrain creation toolset, which is very similar to the free-form map creator in Far Cry games.