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-rw-r--r--src/mapgen.cpp7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index b095d34c8..7a03a4606 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -621,7 +621,7 @@ MapgenBasic::~MapgenBasic()
}
-MgStoneType MapgenBasic::generateBiomes()
+MgStoneType MapgenBasic::generateBiomes(s16 biome_zero_level)
{
// can't generate biomes without a biome generator!
assert(biomegen);
@@ -673,7 +673,10 @@ MgStoneType MapgenBasic::generateBiomes()
(air_above || !biome);
if (is_stone_surface || is_water_surface) {
- biome = biomegen->getBiomeAtIndex(index, y);
+ // Limit to +-MAX MAP GENERATION LIMIT to work with biome y_min / y_max.
+ s32 relative_y = rangelim(y - biome_zero_level,
+ -MAX_MAP_GENERATION_LIMIT, MAX_MAP_GENERATION_LIMIT);
+ biome = biomegen->getBiomeAtIndex(index, relative_y);
if (biomemap[index] == BIOME_NONE && is_stone_surface)
biomemap[index] = biome->index;