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Biome generation: Fix layers of 'filler' nodes at biome y limits

Error was exposed by commit a1389c3
'nplaced' was not set to U16_MAX when biome 'stone' was placed, so when
biome was recalculated in a column of stone, the 'nplaced' value
caused a few remaining filler nodes to be placed.
Occurs when the lower biome has a deeper depth of 'top' plus 'filler'
than the upper biome.
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paramat committed Sep 17, 2017
1 parent 5b6d448 commit 76817fdf98b1597c569267bc751f4f285302721a
Showing with 1 addition and 0 deletions.
  1. +1 −0 src/mapgen.cpp
@@ -722,6 +722,7 @@ void MapgenBasic::generateBiomes(MgStoneType *mgstone_type,
nplaced++;
} else {
vm->m_data[vi] = MapNode(biome->c_stone);
nplaced = U16_MAX; // Disable top/filler placement
}

air_above = false;

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