Minecraft Stronghold Finder
An Eye of Ender points at the stronghold but never tells you how far. Two throws from different positions give two lines, and where they cross is the stronghold's starting staircase. Enter the F3 position and facing angle from each throw and this works out the intersection, so you stop walking the moment you are on top of it.
Throw an Eye of Ender, press F3, and copy your position and the Facing angle while looking straight at the eye. Walk a few hundred blocks sideways and repeat.
Accuracy depends entirely on how precisely you face the eye. Take the second throw at a wide angle to the first; two throws only a few degrees apart will land you hundreds of blocks off.
Method: each throw is a line from its (x, z) along the direction (−sin yaw, cos yaw), where yaw is the F3 Facing angle; the answer is the point where the two lines cross.
Read more on the blog
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