local t = 0

local function make_color(x, y, z)
	return string.format("#%02x%02x%02x", math.floor(x * 255), math.floor(y * 255), math.floor(z * 255))
end

minetest.register_globalstep(function(dtime)
	t = t + dtime
	if t > 30 then t = 0 end
	for _, player in ipairs(minetest.get_connected_players()) do
			player:set_clouds({
				density = t * 0.03,
				--color = "#fff0f0",
				color = make_color(1 - t / 50, 1 - t / 50, 1 - t / 50),
				ambient = "#000000",
				height = 120.0 - 3 * t,
				thickness = 2 + 0.5 * t,
				speed = {x = 2, y = t * t / 10}})
			--player:set_sky(make_color(0.5, 0.5, 1 - t / 60), "plain")
	end
end)