Biomes/decorations/ores: Make relative to 'water_level' setting
Add 'biome_zero_level' argument to 'generateBiomes()', 'deco_zero_level' argument to 'placeAllDecos()' and 'ore_zero_level' to 'placeAllOres()' to allow mapgens to vertically shift the registered biomes, decorations and ores per-mapchunk. Will also allow many realm possibilities in future mapgens.
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@@ -619,10 +619,12 @@ void MapgenV6::makeChunk(BlockMakeData *data)
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// Generate the registered decorations
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if (flags & MG_DECORATIONS)
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m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
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m_emerge->decomgr->placeAllDecos(this, blockseed,
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node_min, node_max, water_level - 1);
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// Generate the registered ores
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m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
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m_emerge->oremgr->placeAllOres(this, blockseed,
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node_min, node_max, water_level - 1);
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// Calculate lighting
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if (flags & MG_LIGHT)
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