I don't think WM is the right tool for a cave, it generates a heightmap, so it can't handle these things. You could generate some rough rounded terrain but then you would need a 3d tool to excavate it and create a ceiling.
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Quote from: Demostenes on March 08, 2016, 10:08:49 am
There are already World generating tools with GPU support
Quote from: ronan.thibaudau on January 01, 2016, 11:21:55 am
Also i'm going to have a pretty beefy server soon again, let me know if you'd be interested in having a very high resolution render done for free (if you're using a version of WM i have access to). Depending on how hungry your graph is i could go pretty high (i've done decently complex graphs at 128 000 X 128 000).