diff --git a/init.lua b/init.lua
index 4b64fa2..ef9eb19 100644
--- a/init.lua
+++ b/init.lua
@@ -11,8 +11,8 @@
 
 ]]--
 
-local wp = minetest.get_worldpath() .. "/luscious"
-minetest.mkdir(wp)
+gt = {}
+tablesize = 0
 
 local mgp = minetest.get_mapgen_params()
 local chunksize = 16 * mgp.chunksize
@@ -28,25 +28,33 @@ local function cmpy(p2, y)
 		return math.max(1, p2)
 	end
 end
+
+local function chose_color(pos)
+	-- Calculate color from biome heat and humidity.
+	local biome_data = minetest.get_biome_data(pos)
+	local hum1 = biome_data.humidity
+	local temp1 = biome_data.heat 
+	local vh = math.floor(math.min(math.max(math.floor(hum1), 0), 100) / 6.6)
+	local vt = math.floor(math.min(math.max(math.floor(temp1), 0), 100) / 6.6)
+	vt = vt - math.max(math.min(vt, math.floor(pos.y / 16)), 0)
+	return vh * 16 + vt
+end
+
 local function on_construct(pos)
 	-- get chunk from pos
 	local v = vector.apply(pos, function(a) return math.floor((a - 48) / chunksize) end)
 	local o = vector.subtract(pos, vector.apply(v, function(a) return (a * chunksize) + 48 end))
 	local l = o.z * (chunksize) + o.x
 	local p = minetest.hash_node_position(v)
-
-	local f = io.open(wp .. "/" .. string.format("%d", p), "r")
-	if not f then
-		minetest.log("error", "unable to find map for " .. string.format("%d", p))
-		return
-	end
-
-	local z = f:read("*a")
-	f:close()
-	local map = minetest.decompress(z)
-
+	local map = gt[p]
+	local mv = 0
 	local node = minetest.get_node(pos)
-	node.param2 = cmpy(string.byte(map, l + 1), pos.y)
+	if map == nil then
+		mv = chose_color(pos) 
+	else
+		mv = cmpy(string.byte(map, l + 1), pos.y)
+	end
+	node.param2 = mv
 	minetest.swap_node(pos, node)
 end
 
@@ -146,12 +154,14 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
 		h2 = math.floor(math.min(math.max(math.floor(h2), 0), 100) / 6.6)
 		map = map .. string.char(h1 + (h2 * 16))
 	end
-	local p = string.format("%d", minetest.hash_node_position(v))
-
-	local f = assert(io.open(wp .. "/" .. p, "w"), wp .. "/" .. p)
-	f:write(minetest.compress(map))
-	f:close()
-
+	local p = minetest.hash_node_position(v)
+	if tablesize > 75 then
+		gt = {}
+		collectgarbage()
+		tablesize = 0
+	end
+	tablesize = tablesize + 1
+	gt[p] = map
 	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
 	local area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
 	local data = vm:get_data()