Make domes sky-like.

mapgen.lua

 local node = loud_walking.node
 
 local bevel = 40
-local glass = "loud_walking:transparent_scrith"
+local cloud_i = 0.5
+local glass = {"loud_walking:sky_scrith", "loud_walking:cloud_scrith", "loud_walking:transparent_scrith"}
 
 
 local data = {}
@@ -18,6 +19,10 @@ local cave_noise = {offset = 0, scale = 1,
 seed = -3977, spread = {x = 30, y = 30, z = 30}, octaves = 3,
 persist = 0.8, lacunarity = 2}
 
+local cloud_noise = {offset = 0, scale = 1,
+seed = -7874, spread = {x = 30, y = 30, z = 30}, octaves = 3,
+persist = 0.8, lacunarity = 2}
+
 loud_walking.biomes = {}
 local biomes = loud_walking.biomes
 local biome_names = {}
@@ -235,8 +240,6 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 	a = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
 	csize = vector.add(vector.subtract(maxp, minp), 1)
 
-	local write = false
-
 	-- Deal with memory issues. This, of course, is supposed to be automatic.
 	local mem = math.floor(collectgarbage("count")/1024)
 	if mem > 300 then
@@ -283,6 +286,7 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 
 	terrain = minetest.get_perlin_map(terrain_noise, csize):get2dMap_flat(minp)
 	cave = minetest.get_perlin_map(cave_noise, csize):get3dMap_flat(minp)
+	cloud = minetest.get_perlin_map(cloud_noise, csize):get2dMap_flat(minp)
 
 	local pod = is_pod(minp.x, minp.y, minp.z)
 	local connection = connection(minp.x, minp.y, minp.z)
@@ -316,10 +320,9 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 							data[ivm] = node("loud_walking:scrith")
 							lightmap[ivm] = 0
 						else
-							data[ivm] = node(glass)
+							data[ivm] = node(glass[cloud[index] < cloud_i and 1 or 2])
 						end
 						in_cave = false
-						write = true
 					elseif (dx == 0 or dx == csize.x - 1) or (dz == 0 or dz == csize.z - 1) or (dy == 0 or dy == csize.y - 1) then
 						if math.abs(dy - half - 2) < 2 and (dz == half or dx == half) then
 							data[ivm] = node("air")
@@ -327,31 +330,30 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 							if biome ~= "underground" and dy < half then
 								data[ivm] = node("loud_walking:scrith")
 								lightmap[ivm] = 0
+							elseif dy == csize.y - 1 then
+								data[ivm] = node(glass[cloud[index] < cloud_i and 1 or 2])
 							else
-								data[ivm] = node(glass)
+								data[ivm] = node(glass[1])
 							end
-							write = true
 						end
 						in_cave = false
 					elseif (((dx == 35 or dx == 45) and dz >= 35 and dz <= 45) or ((dz == 35 or dz == 45) and dx >= 35 and dx <= 45)) and dx ~= 40 and dz ~= 40 and dy == csize.y - 2 then
 						data[ivm] = node("loud_walking:controls")
 					elseif (((dx == 35 or dx == 45) and dz >= 35 and dz <= 45) or ((dz == 35 or dz == 45) and dx >= 35 and dx <= 45)) and dx ~= 40 and dz ~= 40 and dy > csize.y - 5 then
-						data[ivm] = node(glass)
+						data[ivm] = node(glass[3])
 					elseif dz >= 35 and dz <= 45 and dx >= 35 and dx <= 45 and dy == csize.y - 5 then
-						data[ivm] = node(glass)
+						data[ivm] = node(glass[3])
 					elseif not in_cave and  (ocean or swamp or beach) and dy > terr + ground and dy <= half and dy == terr + ground + 1 then
 						-- ** water decorations **
 						--local deco = get_decoration(biome)
 						--if deco then
 						--	data[ivm] = node(deco)
 						--end
-						--write = true
 					elseif not in_cave and dy == terr + ground + 1 then
 						local deco = get_decoration(biome)
 						if deco then
 							data[ivm] = node(deco)
 						end
-						write = true
 					elseif (ocean or swamp or beach) and dy > terr + ground and dy <= half and dy >= half - depth_water_top then
 						data[ivm] = node(node_water_top)
 						in_cave = false
@@ -400,12 +402,10 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 						data[ivm] = node(node_top)
 						lightmap[ivm] = 0
 						in_cave = false
-						write = true
 					elseif dy > terr + ground - depth_filler - depth_top then
 						data[ivm] = node(node_filler)
 						lightmap[ivm] = 0
 						in_cave = false
-						write = true
 					else
 						data[ivm] = node(node_stone)
 						if in_cave and node_stone == "default:stone" and math.random(20) == 1 then
@@ -417,12 +417,10 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 						end
 						lightmap[ivm] = 0
 						in_cave = false
-						write = true
 					end
 				elseif connection and dy == half and ((dx == half and connection % 4 == 0) or (dz == half and connection % 2 == 1)) then
 					data[ivm] = node("loud_walking:scrith")
 					lightmap[ivm] = 0
-					write = true
 				end
 
 				if not in_cave then
@@ -462,17 +460,17 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 		end
 	end
 
-	if write then
-		vm:set_data(data)
-		minetest.generate_ores(vm, minp, maxp)
-		minetest.generate_decorations(vm, minp, maxp)
-		--vm:set_param2_data(p2data)
-		--vm:set_lighting({day = 15, night = 0})
+	vm:set_data(data)
+	minetest.generate_ores(vm, minp, maxp)
+	minetest.generate_decorations(vm, minp, maxp)
+	--vm:set_param2_data(p2data)
+	--vm:set_lighting({day = 15, night = 0})
+	if pod then
 		vm:set_light_data(lightmap)
-		vm:calc_lighting(minp, maxp, false)
-		vm:update_liquids()
-		vm:write_to_map()
 	end
+	vm:update_liquids()
+	vm:calc_lighting(minp, maxp, false)
+	vm:write_to_map()
 
 	vm, a, heightmap, biomemap = nil, nil, nil, nil
 end

nodes.lua

@@ -21,8 +21,23 @@ minetest.register_node("loud_walking:scrith", {
 	sounds = default.node_sound_stone_defaults(),
 })
 
-local node = loud_walking.clone_node("default:glass")
-node.groups = {}
+minetest.register_node("loud_walking:sky_scrith", {
+	description = "Transparent Scrith",
+	drawtype = "glasslike",
+	paramtype = "light",
+	sunlight_propagates = true,
+	tiles = {"loud_walking_sky_glass.png"},
+	light_source = 1,
+	use_texture_alpha = true,
+	is_ground_content = false,
+	groups = {},
+	sounds = default.node_sound_stone_defaults(),
+})
+local node = loud_walking.clone_node("loud_walking:sky_scrith")
+node.tiles = {"loud_walking_cloud_glass.png"}
+minetest.register_node("loud_walking:cloud_scrith", node)
+local node = loud_walking.clone_node("loud_walking:sky_scrith")
+node.tiles = {"loud_walking_glass_detail.png"}
 minetest.register_node("loud_walking:transparent_scrith", node)
 
 minetest.register_node("loud_walking:controls", {