if minetest.get_mapgen_params().mgname == "singlenode" then
	local ground_level = tonumber(minetest.settings:get("water_level") or 1)
	
	minetest.register_on_generated(function(minp, maxp, blockseed)
		local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
		local va = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
		
		local air = minetest.get_content_id("air")
		local stone = minetest.get_content_id("minecraft:stone")
		local grass = minetest.get_content_id("minecraft:grass")
		
		local nodes = vm:get_data()
		
		for i, _ in pairs(nodes) do
			local y = va:position(i).y
			if y < ground_level then
				nodes[i] = stone
			elseif y == ground_level then
				nodes[i] = grass
			else
				nodes[i] = air
			end
		end
		
		vm:set_data(nodes)
		vm:write_to_map()
	end)
else
	minetest.register_biome({
		name = "cavegame",
	--	node_dust = "air",
		node_top = "minecraft:grass",
		depth_top = 1,
	--	depth_filler = 1,
		node_stone = "minecraft:stone",
		heat_point = 50,
		humidity_point = 50,
		y_min = -3100, y_max = 3100,
	})
end