Some semi-random thoughts on terrain generation

[xoft]

Problem is, this is not exactly height generator. Because height generator cannot make overhangs.

There are two ways of achieving overhangs - either modify the composable generator architecture so that instead of height generator and composition generator, we get a 3D composition generator.
*or* (probably preferably)
keep the height generator and modify the composition generator so that it sometimes generates overhangs in a layer from the generated height to some depth (~sealevel?).