World Gen Tweaker
World Gen Tweaker allows users to modify vanilla and mod biomes through a simple scripting language. You can change biome height, hilliness, temperature, rainfall, water color, water fog color, and fog color. Eventually you will be able to create new biomes through the scripting language alone.
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Support me on patreon to get alpha builds early, as well as other perks! By supporting me on Patreon, you are helping fund World Gen Tweaker's development and continued support.