should disable falling snow in deserts

src/falling_snow.lua

@@ -40,7 +40,9 @@ near torches and lava.
 --=============================================================
 
 
-if snow.enable_snowfall then
+if not snow.enable_snowfall then
+	return
+end
 
 local weather_legacy
 
@@ -75,20 +77,31 @@ if snow.enable_snowfall then
 		end
 	end)
 
+-- copied from meru mod
+local SEEDDIFF3 = 9130 -- 9130 -- Values should match minetest mapgen desert perlin.
+local OCTAVES3 = 3 -- 3
+local PERSISTENCE3 = 0.5 -- 0.5
+local SCALE3 = 250 -- 250
+
 --Get snow at position.
 local get_snow = function(pos)
 	--Legacy support.
 	if weather_legacy == "snow" then
-			local perlin1 = minetest.env:get_perlin(112,3, 0.5, 150)
-			if perlin1:get2d( {x=pos.x, y=pos.z} ) > 0.53 then
+		local perlin1 = minetest.get_perlin(112,3, 0.5, 150)
+		if perlin1:get2d({x=pos.x, y=pos.z}) <= 0.53 then
+			return false
+		end
+
+		-- disable falling snow in desert
+		local desert_perlin = minetest.get_perlin(SEEDDIFF3, OCTAVES3, PERSISTENCE3, SCALE3)
+		local noise3 = desert_perlin:get2d({x=x+150,y=z+50}) -- Offsets must match minetest mapgen desert perlin.
+		if noise3 > 0.35 then -- Smooth transition 0.35 to 0.45.
+			return false
+		end
 		return true
-			else
-				return false
 	end
-		else
 	return false
 end
-	end
 
 local addvectors = vector and vector.add
 
@@ -124,16 +137,16 @@ if snow.enable_snowfall then
 	return data
 end
 
-	local snow_fall=function (pos, player, animate)
+local function snow_fall(pos, player, animate)
 	local ground_y = nil
 	for y=pos.y+10,pos.y+20,1 do
-				local n = minetest.env:get_node({x=pos.x,y=y,z=pos.z}).name
+		local n = minetest.get_node({x=pos.x,y=y,z=pos.z}).name
 		if n ~= "air" and n ~= "ignore" then
 			return
 		end
 	end
 	for y=pos.y+10,pos.y-15,-1 do
-				local n = minetest.env:get_node({x=pos.x,y=y,z=pos.z}).name
+		local n = minetest.get_node({x=pos.x,y=y,z=pos.z}).name
 		if n ~= "air" and n ~= "ignore" then
 			ground_y = y
 			break
@@ -172,7 +185,7 @@ if snow.enable_snowfall then
 		local smaxp = addvectors(ppos, {x= 20, y=0, z= 20})
 	
 		-- Make sure player is not in a cave/house...
-			if get_snow(ppos) and minetest.env:get_node_light(ppos, 0.5) == 15 then
+		if get_snow(ppos) and minetest.get_node_light(ppos, 0.5) == 15 then
 
 			local minp = addvectors(ppos, {x=-9, y=3, z=-9})
 			local maxp = addvectors(ppos, {x= 9, y=5, z= 9})
@@ -213,15 +226,6 @@ if snow.enable_snowfall then
 					snow_fall(randpos(sminp, smaxp), player, true)
 				end
 			end
-					
-				
-			else
-			
-				if math.random(1,5) == 4 then	
-					snow_fall(randpos(sminp, smaxp), player, true)
-				end
 		end
 	end
 end)
-	
-end