I have been wanting to create some caves in the flavor of the Minoc caves. That is, a mountain, with a mouth opening that someone walks through and is then in a cave for mining, killing, whatever. I loaded up CentrED today, and tried working it out... So far, have not been very successful. Every time I try to place a cave floor at say a 0 Z value, the editor things I want to collapse the mountain to 0 level. So, it creates this monster valley. I can't seem to get it to put a second layer in at z=0. Any ideas how to do this? Theoretically, you should be able to create many layers on top of each other.
You have to use statics for the ground of the cave. There can always only be one map tile per x, y coordinate.