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I want to create a very large cave having the same shape as the surface. How can I hollow out (I mean leaving only the blocks at the surface untouched) the blocks inside ?

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    If the visable blocks are only dirt/sand/whatever, just replace stone with air. – aytimothy Oct 20 '14 at 4:46
  • In the case of sand that might cause problems if you trigger a block update. – JonK Oct 20 '14 at 12:58
  • @aytimothy Unfourtunatley large parts of the surface are stone (it's a Crag mountain biome from Biomes O' Plenty mod) – Andy Rama Oct 20 '14 at 14:06
  • I'm not 100% sure what you're trying to achieve here. But if I'm correct, I'd suggest installing voxelsniper to turn the surface into another material, then replacing stone with air. – hedgehog1029 Dec 9 '14 at 19:38
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With world edit , select the mountain and just type //hollow .Very top blocks in your selection will stay all other ones will be cleared.Don't matter which block they are.

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Perhaps working with two players would work. The first can replace the top layer(s) with something like wool, the second can remove everything except the wool and the first can then undo their action to leave a top layer of the original blocks. I'm not sure on the exact commands needed, but I know I've been able to replace the top layers of something before now. Perhaps //naturalize could work, as it replaces the top layers of any stone with dirt and grass. Any underground clumps can be removed more manually if needed, and removing ores shouldn't be hard if you know the IDs.

The theoretical plan: Player 1 selects the area and runs //naturalize, perhaps after turning ores into stone. Player 2 replaces all the stone with air. Player 1 runs //undo to return the top layers. Any modded blocks on top should be untouched.

Good luck! I can't be certain that this will work properly, so make a world backup before you start. Test it on a small corner before doing the whole mountain as to not have to wait ages for results.

Extra note: I would look at installing async worldedit for large jobs, it vastly improves block placement efficiency and tries to not crash your server!

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IM not sure about worldedit, however if you use mcedit you can get the filter HOLLOW and select your mountain, press filter and it will hollow it out.

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