mapgen.lua

-- code from flowers mod by Ironzorg, VanessaE
-- with just a small adjustion

minetest.register_on_generated(function(minp, maxp, seed)
	if maxp.y >= 5 and minp.y <= 0 then
		-- Generate flowers
		local perlin1 = minetest.get_perlin(436, 3, 0.6, 100)
		-- Assume X and Z lengths are equal
		local divlen = 16
		local divs = (maxp.x-minp.x)/divlen+1;
		for divx=0,divs-1 do
		for divz=0,divs-1 do
			local x0 = minp.x + math.floor((divx+0)*divlen)
			local z0 = minp.z + math.floor((divz+0)*divlen)
			local x1 = minp.x + math.floor((divx+1)*divlen)
			local z1 = minp.z + math.floor((divz+1)*divlen)
			-- Determine flowers amount from perlin noise
			local grass_amount = math.floor(perlin1:get2d({x=x0, y=z0}) ^ 3 * 9)
			-- Find random positions for flowers based on this random
			local pr = PseudoRandom(seed+456)
			for i=0,grass_amount do
				local x = pr:next(x0, x1)
				local z = pr:next(z0, z1)
				-- Find ground level (0...15)
				local ground_y = nil
				for y=30,0,-1 do
					if minetest.get_node({x = x, y = y, z = z}).name ~= "air" then
						ground_y = y
						break
					end
				end
				
				if ground_y then
					local p = {x = x, y = ground_y + 1, z = z}
					local nn = minetest.get_node(p).name
					-- Check if the node can be replaced
					if minetest.registered_nodes[nn] and
						minetest.registered_nodes[nn].buildable_to then
						nn = minetest.get_node({x = x, y = ground_y, z = z}).name
						if nn == "default:sand" then	-- would like to see them preferable in sandstone biomes
							minetest.set_node(p, {name = "lavender:lavender"})
						end
					end
				end
				
			end
		end
		end
	end
end)