Add two biomes, Snowy and Plain.

init.lua

@@ -250,6 +250,7 @@ minetest.register_node("snow:snow_block", {
 	--mapgen defines the vegetation.
 	--1 = Moss
 	--2 = Papyrus
+	--3 = Dry shrub
 	is_ground_content = true,
 	groups = {crumbly=3,melts=2,falling_node=1},
 	drop = 'snow:snow_block',
@@ -268,6 +269,11 @@ minetest.register_node("snow:snow_block", {
 			if  n == "air" or n == "default:water_flowing" or n == "default:water_source" then
 				minetest.env:add_node(pos,{name="default:papyrus"})
 			end
+		elseif node.param2 == 3 then
+			local n = minetest.env:get_node(pos).name
+			if  n == "air" or n == "default:water_flowing" or n == "default:water_source" then
+				minetest.env:add_node(pos,{name="default:dry_shrub"})
+			end
 		end
 	end,
 })

mapgen.lua

@@ -8,6 +8,9 @@ function snow.make_pine(pos,snow)
 		if env:get_node({x=pos.x+x,y=pos.y,z=pos.z+z}).name == "snow:snow" then
 			env:remove_node({x=pos.x+x,y=pos.y,z=pos.z+z})
 		end
+		if env:get_node({x=pos.x+x,y=pos.y,z=pos.z+z}).name == "snow:snow_block" then
+			env:remove_node({x=pos.x+x,y=pos.y,z=pos.z+z})
+		end
 	end
 	end
 	--Make tree.
@@ -88,6 +91,8 @@ if maxp.y >= -10 then
 		--Choose a biome type.
 		local pr = PseudoRandom(seed+57)
 		local biome = pr:next(1, 12)
+		local snowy = biome == 1 --spawns alot of snow
+		local plain = biome == 7 --spawns not much
 		local icebergs = biome == 2
 		local icesheet = biome == 3
 		local alpine = biome == 11 or biome == 12 --rocky terrain
@@ -103,7 +108,9 @@ if maxp.y >= -10 then
 
 		--Debugging function
 		local biomeToString = function(num)
-			if num == 1 or num == 7 or num == 8 or num == 4 then return "normal"
+			if num == 1 then return "snowy"
+			elseif num == 7 then return "plain"
+			elseif num == 8 or num == 4 then return "normal"
 			elseif num == 2 then return "icebergs"
 			elseif num == 3 then return "icesheet"
 			elseif num == 5 then return "icecave"
@@ -136,14 +143,16 @@ if maxp.y >= -10 then
 				--Check if we are in a "Snow biome"
                 local in_biome = false
                 local test = perlin1:get2d({x=x, y=z})
-                if smooth and (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
+                if smooth and (not snowy) and (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
                     in_biome = true
-                elseif not smooth and test > 0.53 then
+                elseif (not smooth or snowy) and test > 0.53 then
 					in_biome = true
                 end
                 
                 if in_biome then
                 
+                if not plain or pr:next(1,12) == 1 then  
+                
 					 -- Find ground level (0...15)
 					local ground_y = nil
 					for y=maxp.y,minp.y+1,-1 do
@@ -172,11 +181,19 @@ if maxp.y >= -10 then
 							elseif shrubs and pr:next(1,28) == 1 then
 								--Spawns dry shrubs.
 								env:add_node({x=x,y=ground_y,z=z}, {name="snow:dirt_with_snow"})
+								if snowy then
+									env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow_block", param2=3})
+								else
 									env:add_node({x=x,y=ground_y+1,z=z}, {name="default:dry_shrub"})
+								end
 							elseif pines and pr:next(1,36) == 1 then
 								--Spawns pines.
 								env:add_node({x=x,y=ground_y,z=z}, {name="default:dirt_with_grass"})
 								make_pine({x=x,y=ground_y+1,z=z},true)
+							elseif snowy then
+								--Spawns snow blocks.
+								env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow_block"})
+								env:add_node({x=x,y=ground_y+2,z=z}, {name="snow:snow",param2=veg})
 							else
 								--Spawns snow.
 								env:add_node({x=x,y=ground_y,z=z}, {name="snow:dirt_with_snow"})
@@ -236,14 +253,15 @@ if maxp.y >= -10 then
 								end
 							end
 						end
-				elseif ground_y and node.name == "snow:snow" and node.name ~= "snow:ice" then
+					--~ elseif ground_y and node.name == "snow:snow" and node.name ~= "snow:ice" then
-					--Abort genaration.
+						--~ --Abort genaration.
-					local name = env:get_node({x=x,y=ground_y-1,z=z}).name
+						--~ local name = env:get_node({x=x,y=ground_y-1,z=z}).name
-					if name ~= "default:leaves" and name ~= "snow:needles" then
+						--~ if name ~= "default:leaves" and name ~= "snow:needles" then
-						if debug then
+							--~ if debug then
-							print(biomeToString(biome)..": snow found ABORTED!")
+								--~ print(biomeToString(biome)..": snow found ABORTED!")
-						end
+							--~ end
-						return
+							--~ return
+						--~ end
 					end
 				end
 			end