Disable mapgen by default, minetest has snow biomes now.

settingtypes.txt

@@ -33,3 +33,6 @@ mapgen_rarity (Snow Biome Rarity %) float 18
 
 #size of the generated… (has an effect to the rarity, too)
 mapgen_size (Snow Biome Size) float 210
+
+#Minetest finally has capable snow biomes by default, lets not mess it up with the old snowgen.
+disable_mapgen (Disable mod-generated biomes) bool true

src/mapgen.lua

@@ -12,6 +12,8 @@ saplings grow into trees. --]]
 
 -- Part 1: To disable the mapgen, add the *starting* comment under this line.
 
+if not snow.disable_mapgen then
+	print("[snow] Mapgen enabled!")
 	
 	snow.mapgen = snow.mapgen or {}
 	local mg = snow.mapgen
@@ -70,6 +72,7 @@ else
 		--Load mapgen_v6 compatibility.
 		dofile(path.."/src/mapgen_v6.lua")
 	end
+end
 
 -- To complete the commenting-out add the *closing* comment under this line.
 

src/mapgen_v6.lua

@@ -142,10 +142,10 @@ local function define_contents()
 end
 
 local smooth = snow.smooth_biomes
-local smooth_rarity_max = mg.smooth_rarity_max
-local smooth_rarity_min = mg.smooth_rarity_min
-local smooth_rarity_dif = mg.smooth_rarity_dif
-local nosmooth_rarity = mg.nosmooth_rarity
+local smooth_rarity_max = mg.smooth_rarity_max or 0
+local smooth_rarity_min = mg.smooth_rarity_min or 0
+local smooth_rarity_dif = mg.smooth_rarity_dif or 0
+local nosmooth_rarity = mg.nosmooth_rarity or 0
 
 snow.register_on_configuring(function(name, v)
 	if name == "debug" then
@@ -235,7 +235,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	for z = z0, z1 do
 	for x = x0, x1 do
 		local in_biome = false
-		local test
+		local test = 0
 		if nvals_default[ni] < 0.35 then
 			nvals_cold = nvals_cold or perlin_objs.cold:get2dMap_flat({x=x0, y=z0}, nbuf_cold)
 			test = math.min(nvals_cold[ni], 1)

src/util.lua

@@ -12,6 +12,7 @@ snow = {
 	min_height = tonumber(minetest.settings:get("min_height")) or 3,
 	mapgen_rarity = tonumber(minetest.settings:get("mapgen_rarity")) or 18,
 	mapgen_size = tonumber(minetest.settings:get("mapgen_size")) or 210,
+	disable_mapgen =  minetest.settings:get_bool("disable_mapgen"),
 }
 
 -- functions for dynamically changing settings