overviewer/Minecraft-Overviewer — comment on commit b2343015215ab27cb57797f1e4fffd7f44df4c79
File:  line 0
By brownan:

No you're right. I couldn't test all of this code until the C code was updated. Here I forgot that chunk sections count 0-15 from bottom to top, not from top to bottom.

If the bottom of the map is being cut off, that means I must have miscalculated something elsewhere.