It had occurred to me to use a robot to travel to a set height, travelling down till it hit something, send that info to a computer, then return to its height and move over to the next spot. But that way would only give a height map and be really slow.
[Outdated Post] [MC 1.6.4] [OC 1.2.2+] Computronics (0.1.5) - Link to new website in the thread
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Epic. There are no end to the possibilities with this addon.