Simple 3d Crater Generator Routine

A simple 3d crater generating routine. It places a crater on a terrain (or not on a terrain) of an arbitrary size and height. 128 polygons, single surface can be used for all craters.

http://www.blitzbasic.com/codearcs/codearcs.php?code=919

Nice one. I always like to include an example() function so that people can quickly see what the code does.