Hide papyrus in snow.

init.lua

@@ -246,12 +246,30 @@ minetest.register_on_dignode(unsnowify)
 minetest.register_node("snow:snow_block", {
 	description = "Snow",
 	tiles = {"snow_snow.png"},
+	--param2 is reserved for what vegetation is hiding inside.
+	--mapgen defines the vegetation.
+	--1 = Moss
+	--2 = Papyrus
 	is_ground_content = true,
 	groups = {crumbly=3,melts=2,falling_node=1},
 	drop = 'snow:snow_block',
 	sounds = default.node_sound_dirt_defaults({
 		footstep = {name="default_grass_footstep", gain=0.4},
 	}),
+	--Update dirt node underneath snow.
+	after_destruct = function(pos, node, digger)
+		if node.param2 == 1 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="snow:moss",param2=1})
+			end
+		elseif node.param2 == 2 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:papyrus"})
+			end
+		end
+	end,
 })
 
 --Snow brick.

mapgen.lua

@@ -192,6 +192,13 @@ if maxp.y >= -10 then
 					end
 				elseif ground_y and env:get_node({x=x,y=ground_y,z=z}).name == "default:leaves" then
 					env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
+				elseif ground_y and env:get_node({x=x,y=ground_y,z=z}).name == "default:papyrus" then
+					for i=ground_y, ground_y-4, -1 do
+						if env:get_node({x=x,y=i,z=z}).name == "default:papyrus" then
+							env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
+							env:add_node({x=x,y=i,z=z}, {name="snow:snow_block", param2=2})
+						end
+					end
 				elseif ground_y and node.name == "default:water_source" then
 					if not icesheet and not icecave and not icehole then
 						--Coastal ice.