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I read a joke in a screenshot that "you don't"... but actually....how do you? I'm out of the energy grapple's range to attach to anything.
Also, is there a thread on sculpting? Or is that not in build 91?
Whoops silly me, readme.txt has all the answers. " You can't reinitialize the world from within the game yet. If you wish to do so, you must delete seed.dat in the savegame folder"