Add riverbeds to biomes and start hell levels.

deco.lua

@@ -90,6 +90,8 @@ minetest.register_biome({
 	node_filler = "default:dirt",
 	depth_filler = 1,
 	node_stone = "default:desert_stone",
+	node_riverbed = "default:sand",
+	depth_riverbed = 2,
 	--node_water_top = "",
 	--depth_water_top = ,
 	--node_water = "",

deco_caves.lua

@@ -89,8 +89,24 @@ minetest.register_node("fun_caves:glowing_fungus", {
 	groups = {dig_immediate = 3},
 })
 
+-- Iron, hot
+newnode = fun_caves.clone_node("default:steelblock")
+newnode.description = "Hot Iron Block"
+newnode.tiles = {"default_steel_block.png^[colorize:#FF3000:150"}
+newnode.groups.surface_hot=3
+newnode.light_source = 3
+minetest.register_node("fun_caves:hot_iron", newnode)
+
+-- Brass, hot
+newnode = fun_caves.clone_node("default:steelblock")
+newnode.description = "Hot Brass Block"
+newnode.tiles = {"default_steel_block.png^[colorize:#FFBF00:150"}
+newnode.groups.surface_hot=3
+newnode.light_source = 2
+minetest.register_node("fun_caves:hot_brass", newnode)
+
 -- moon glass (glows)
-local newnode = fun_caves.clone_node("default:glass")
+newnode = fun_caves.clone_node("default:glass")
 newnode.light_source = default.LIGHT_MAX
 minetest.register_node("fun_caves:moon_glass", newnode)
 
@@ -313,6 +329,19 @@ newnode.sounds = default.node_sound_dirt_defaults({
 })
 minetest.register_node("fun_caves:stone_with_algae", newnode)
 
+-- stone, hot
+minetest.register_node("fun_caves:hot_stone", {
+	description = "Hot Stone",
+	tiles = {"default_desert_stone.png^[colorize:#FF0000:150"},
+	is_ground_content = true,
+	groups = {crumbly=2, surface_hot=3},
+	light_source = fun_caves.light_max - 5,
+	damage_per_second = 1,
+	sounds = default.node_sound_stone_defaults({
+		footstep = {name="default_stone_footstep", gain=0.25},
+	}),
+})
+
 -- stone with lichen
 newnode = fun_caves.clone_node("default:stone")
 newnode.description = "Cave Stone With Lichen"

mapgen.lua

@@ -191,9 +191,17 @@ local function generate(p_minp, p_maxp, seed)
 	math.randomseed(minetest.get_perlin(seed_noise):get2d({x=minp.x, y=minp.z}))
 
 	local write = false
-	local underzone
+	local underzone, dis_map = nil, {}
-	if minp.y % 4960 < 240 and maxp.y % 4960 > 0 then
+	if minp.y < -4000 and minp.y % 4960 < 160 and maxp.y % 4960 > 0 then
-		underzone = true
+		underzone = floor(minp.y / -4960 + 0.5)
+		if underzone == 3 then
+			for i = 0, 10, 2 do
+				dis_map[i] = {}
+				for j = 0, 10, 2 do
+					dis_map[i][j] = rand(4)
+				end
+			end
+		end
 	end
 
 	if not underzone and fun_caves.is_fortress(minp, csize) then
@@ -327,10 +335,31 @@ local function generate(p_minp, p_maxp, seed)
 				end
 
 				for y = minp.y, maxp.y do
-					if column == 1 and data[ivm] ~= node['air'] and y % 4960 < cave_3[index] + 160 and y % 4960 > cave_3[index] + 80 then
+					-- Dis
+					if underzone == 3 then
+						if (x - minp.x) < 8 and (z - minp.z) < 8 then
+							data[ivm] = node["default:steelblock"]
+						elseif data[ivm] ~= node['air'] and y % 4960 < 160 and y % 4960 > 80 then
+							data[ivm] = node["air"]
+						end
+						write = true
+					-- Caina
+					elseif column == 2 and underzone == 1 and (data[ivm] == node['default:stone'] or data[ivm] == node['default:desert_stone']) then
+						if rand(70) == 1 then
+							data[ivm] = node["fun_caves:thin_ice"]
+						else
+							data[ivm] = node["default:ice"]
+						end
+						write = true
+					-- Phlegethos
+					elseif column == 2 and (data[ivm] == node['default:stone'] or data[ivm] == node['default:desert_stone']) and rand(70) == 1 then
+						data[ivm] = node["fun_caves:hot_stone"]
+						write = true
+					-- Dis
+					elseif column == 1 and underzone ~= 3 and data[ivm] ~= node['air'] and y % 4960 < cave_3[index] + 160 and y % 4960 > cave_3[index] + 80 then
 						data[ivm] = node["air"]
 						write = true
-					elseif column < 2 and data[ivm] ~= node['air'] and y < height - cave_3[index] and cave_1[index3d] * cave_2[index3d] > cave_width then
+					elseif column < 2 and underzone ~= 3 and data[ivm] ~= node['air'] and y < height - cave_3[index] and cave_1[index3d] * cave_2[index3d] > cave_width then
 						data[ivm] = node["air"]
 						write = true
 
@@ -386,7 +415,18 @@ local function generate(p_minp, p_maxp, seed)
 							-------------------
 							--biome_val = -0.75
 							-------------------
-							if biome_val < -0.65 then
+							if underzone == 1 then
+								stone_type = node["default:ice"]
+								stone_depth = 2
+							elseif underzone == 3 then
+								stone_type = node["fun_caves:hot_brass"]
+								stone_depth = 1
+							elseif underzone and y % 4960 <= 145 then
+								stone_type = node["fun_caves:hot_cobble"]
+							elseif underzone and y % 4960 > 145 then
+								stone_type = node["fun_caves:black_sand"]
+								stone_depth = 2
+							elseif biome_val < -0.65 then
 								stone_type = node["default:ice"]
 								stone_depth = 2
 							elseif biome_val < -0.6 then
@@ -487,6 +527,20 @@ local function generate(p_minp, p_maxp, seed)
 								end
 							end
 
+							-- Dis
+							if underzone == 3 and data[ivm] == node['air'] and floor((x - minp.x) / 8) % 2 == 0 and floor((z - minp.z) / 8) % 2 == 0 and y % 4960 < 82 + dis_map[floor((x - minp.x) / 8)][floor((z - minp.z) / 8)] * 4 and y % 4960 > 80 then
+								local dx = (x - minp.x) % 16
+								local dy = y % 4960 - 80
+								local dz = (z - minp.z) % 16
+								if ((dx == 0 or dx == 7) and (dz % 3 ~= 2 or dy % 4 == 0)) or ((dz == 0 or dz == 7) and (dx % 3 ~= 2 or dy % 4 == 0)) then
+									data[ivm] = node["fun_caves:hot_iron"]
+								elseif dy %4 == 0 then
+									data[ivm] = node["fun_caves:hot_brass"]
+								end
+								write = true
+								break
+							end
+
 							if data[ivm] == node["air"] and y < maxp.y then
 								-- hanging down
 								if node_above == node["default:stone"] and rand(12) == 1 then
@@ -700,7 +754,7 @@ local function generate(p_minp, p_maxp, seed)
 	if write then
 		vm:set_data(data)
 		--vm:set_param2_data(p2data)
-		if underzone or fun_caves.DEBUG then
+		if fun_caves.DEBUG then
 			vm:set_lighting({day = 10, night = 10})
 		else
 			-- set_lighting causes shadows