I had a go at your heightmap script. all i get is blank, used a mapper to render the terrain.
but the worldsize is correct.
what type of heightmap should i use? greyscale?
can the code even handle something like 4096 x 4096? (my file takes about 35 minutes and i get nothing)
if it can. what would i be doing wrong? or is there other commands i should run first or after it?
EDIT. all the damn blocks are AIR.