So I'm mainly curious about ChunkLOD. This is exactly what I was looking for in order to possibly create a map mod. It provides all the info I need for a surface map, however I want to also make the mod for subterranian as well. I need to be able to retrieve the texture id at a given x,y,z position. I assume that a open cave would return a null value instead of a texture.
Actually this might be more of a problem cause technically if you F2 thorugh a cave ceiling and hit F2 again you can technically stand ontop of the cave ceiling where in reality you would be inside solid rock. So behind the cave wall is the same as inside the cave, from a data perspective. Any other methods or is this technically not possible right now? I guess the block only design of Minecraft makes it much much easier to map out the subterranean.