Biome

There is a somewhat complex logic behind determining which biome gets placed at each pixel. Geology types have prioritized “placement biomes”, meaning that textures can place any of these biomes, but higher-priority biomes (ones earlier in the list) will _overwrite_ lower-priority biomes if the in-game (calculated) elevation at the point associated with the higher-priority biome is higher than the previous in-game elevation. (There is an optional setting, biome_always_takes_priority, that causes this system to ignore the elevation check and will _always_ switch to the higher-priority biome when given a chance.)

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In this example, when textures are overlapping,

• mountain_summit can overwrite peaks, mid_hills, and foothills
• mountain_peaks can overwrite mid_hills and foothills
• mountain_mid_hills can overwrite foothills