> in commanche over kill ?It's called Voxel.Don't ask me why.Below is a text that explains it.Hope I dont infringe on any of his rights in doing this...(u,v) , then w (0,0) =w (256,0) =w (0,256) =w (256,256) . w (1,1) =w (257,257) , etc.Map co-ords: (u,v) co-ordinates that describe a position on the map.Screen co-ords: (x,y) co-ordinates for a pixel on the screen.This is a recursive subdivision, or plasma, fractal.This routine get the heights from the corners of the square it gets given.