Add lava.

mapgen.lua

 local node = loud_walking.node
 
 local bevel = 40
+local glass = "default:glass"
 
 
 local data = {}
@@ -236,16 +237,18 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 	local px = math.floor((minp.x + 32) / csize.x)
 	local pz = math.floor((minp.z + 32) / csize.z)
 	local top = biomes[biome].node_top or "default:dirt_with_grass"
-	local filler = biomes[biome].node_filler or "default:dirt"
+	local node_filler = biomes[biome].node_filler or "default:dirt"
 	local depth_top = biomes[biome].depth_top or 1
 	local depth_filler = biomes[biome].depth_filler or 1
 	local node_stone = biomes[biome].node_stone or "default:stone"
 	local ocean = string.find(biome, "ocean") and true or false
 	local swamp = string.find(biome, "swamp") and true or false
 	local beach = string.find(biome, "beach") and true or false
+	local dunes = string.find(biome, "dunes") and true or false
 	local half = math.floor(csize.y / 2 + 0.5)
 	local ground = half
 
+	beach = beach or dunes
 	if ocean then
 		ground = ground - 15
 	elseif swamp or beach then
@@ -283,7 +286,7 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 							data[ivm] = node("loud_walking:scrith")
 							lightmap[ivm] = 0
 						else
-							data[ivm] = node("default:glass")
+							data[ivm] = node(glass)
 						end
 						in_cave = false
 						write = true
@@ -295,17 +298,24 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 								data[ivm] = node("loud_walking:scrith")
 								lightmap[ivm] = 0
 							else
-								data[ivm] = node("default:glass")
+								data[ivm] = node(glass)
 							end
 							write = true
 						end
 						in_cave = false
-					elseif not in_cave and dy == terr + ground + 1 then
+					elseif not in_cave and dy == terr + ground + 1 and dy > half then
 						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
+						-- ** water decorations **
+						--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 then
 						data[ivm] = node("default:water_source")
 						in_cave = false
@@ -314,8 +324,17 @@ function loud_walking.generate(p_minp, p_maxp, seed)
 						in_cave = false
 					elseif cave[index3d] ^ 2 > 0.1 + dy / half then
 						if terr + ground >= dy and not in_cave and dy > terr + ground - 10 then
-							data[ivm] = node(biomes[biome].node_filler)
-						elseif ocean or swamp then
+							data[ivm] = node(node_filler)
+						elseif dy == 1 then
+							local sr = math.random(9)
+							if not ocean and not swamp and not beach and sr == 1 then
+								data[ivm] = node("default:lava_source")
+							elseif sr > 6 then
+								data[ivm] = node(node_stone)
+							elseif ocean or swamp or beach then
+								data[ivm] = node(node_filler)
+							end
+						elseif ocean or swamp or beach then
 							data[ivm] = node("default:water_source")
 						else
 							data[ivm] = node("air")