Avi Weinstock cb4c3eb34e Bodies of water no longer contain black chunks on the voxel minimap.
The heuristic for pruning dungeon ceilings depended on detecting an
air-to-not-air edge, which was not present for chunks whose topmost
layer was water. Sampling 1 layer of the `above` block introduces such
an edge, allowing the water surface to be detected.
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2021-11-13 17:13:08 +00:00
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