all caves

README.md

@@ -1,6 +1,6 @@
 # fun_caves
 
-Fun Caves is an attempt to convert the mapgen V6 caves into a lua mod, so they can be used with any mapgen. I've translated the C++ code into lua in the most mechanical way possible. I honestly have no idea how half of it works, and I don't intend to spend a lot of time on it in the future, so anyone who likes this mod is encouraged to fork and/or tinker with it and submit pull requests.
+Fun Caves started as an attempt to convert the mapgen V6 caves into a lua mod, so they could be used with any mapgen. However, I've since turned it into an all cave environment, with no surface at all.
 
 ![screenshot](https://github.com/duane-r/fun_caves/raw/master/textures/screenshot.jpg)
 

depends.txt

@@ -1 +1,2 @@
 default
+flowers

fungal_tree.lua

@@ -0,0 +1,358 @@
+-------------------
+-- Fungal Tree   --
+-------------------
+
+local light_max = 9
+
+local colors = {"^[colorize:#FF00FF:60", "", "^[colorize:#0000FF:60", "^[colorize:#FF4500:80"}
+fun_caves.fungal_tree_leaves = {}
+
+-- all leaves
+function fun_caves.make_fungal_tree(data, area, pos, height, leaves, fruit)
+	for y = 0, height do
+		local radius = 1
+		if y > 1 and y < height - 2 then
+			radius = 2
+		end
+		local force_x = math.random(1,3) - 2
+		local force_y = math.random(1,3) - 2
+		for z = -radius,radius do
+			for x = -radius,radius do
+				local sr = math.random(1,27)
+				local i = pos + z*area.zstride + y*area.ystride + x
+				if force_x == x and force_y == y then
+					data[i] = leaves
+				elseif sr == 1 then
+					data[i] = fruit
+				elseif sr < 14 then
+					data[i] = leaves
+				end
+			end
+		end
+	end
+end
+
+-- multicolored growths
+local count = 0
+for _, color in pairs(colors) do
+	count = count + 1
+	local name = "fun_caves:fungal_tree_leaves_"..count
+	fun_caves.fungal_tree_leaves[#fun_caves.fungal_tree_leaves+1] = name
+
+	minetest.register_node(name, {
+		description = "Fungal tree growths",
+		drawtype = "allfaces_optional",
+		waving = 1,
+		visual_scale = 1.3,
+		tiles = {"fun_caves_fungal_tree_leaves.png"..color},
+		paramtype = "light",
+		is_ground_content = false,
+		groups = {snappy=3, flammable=3, leaves=1, plant=1},
+		drop = {
+			max_items = 1,
+			items = {
+				--{items = {"fun_caves:"..tree.name.."_sapling"}, rarity = tree.drop_rarity },
+				{items = {name} }
+			}
+		},
+		sounds = default.node_sound_leaves_defaults(),
+		after_place_node = default.after_place_leaves,
+	})
+
+	minetest.register_craft({
+		output = "default:stick",
+		recipe = {
+			{name}
+		}
+	})
+end
+
+
+local leaves_and_air = table.copy(fun_caves.fungal_tree_leaves)
+leaves_and_air[#leaves_and_air+1] = "air"
+local good_stone = {}
+good_stone["fun_caves:stone_with_lichen"] = true
+good_stone["fun_caves:stone_with_algae"] = true
+
+local function find_ground(pos)
+	for y1 = 1, 16 do
+		local node = minetest.get_node_or_nil({x=pos.x, y=pos.y-y1, z=pos.z})
+		if node then
+			if minetest.get_item_group(node.name, "soil") ~= 0 or
+				good_stone[node.name] then
+				return y1
+			end
+		end
+	end
+
+	return 1000
+end
+
+
+-- fungal spread
+minetest.register_abm({
+	nodenames = fun_caves.fungal_tree_leaves,
+	interval = 2 * fun_caves.time_factor,
+	chance = 10,
+	action = function(pos, node)
+		if minetest.get_node_light(pos, nil) == 15 then
+			minetest.remove_node(pos)
+			return
+		end
+		if find_ground(pos) > 16 then
+			minetest.remove_node(pos)
+			return
+		end
+
+		local grow_pos = {x=pos.x, y=pos.y-1, z=pos.z}
+		local grow_node = minetest.get_node_or_nil(grow_pos)
+		if grow_node and grow_node.name == "air" then
+			minetest.set_node(grow_pos, {name = node.name})
+			return
+		end
+		if math.random(1,3) ~= 1 then
+			return
+		end
+
+		local foreign = {}
+		for _, i in pairs(fun_caves.fungal_tree_leaves) do
+			if i ~= node.name then
+				foreign[#foreign+1] = i
+			end
+		end
+		local pos1, count = minetest.find_nodes_in_area(vector.subtract(pos, 3), vector.add(pos, 3), foreign)
+		if #pos1 > 0 then
+			minetest.set_node(pos1[math.random(1,#pos1)], {name="air"})
+			return
+		end
+
+		if math.random(1,201) == 1 then
+			local new = fun_caves.fungal_tree_leaves[math.random(1,#fun_caves.fungal_tree_leaves)]
+			local pos1, count = minetest.find_nodes_in_area({x=pos.x-8, y=pos.y-16, z=pos.z-8}, {x=pos.x+8, y=pos.y+16, z=pos.z+8}, node.name)
+			for _, p in pairs(pos1) do
+				minetest.set_node(p, {name=new})
+			end
+			return
+		end
+
+		grow_pos = {x = pos.x + math.random(-1,1), y = pos.y + math.random(-1,1), z = pos.z + math.random(-1,1)}
+		grow_node = minetest.get_node_or_nil(grow_pos)
+		--if math.random(1,2) == 1 then
+			minetest.set_node(pos, {name = "air"})
+		--end
+		if not grow_node or not table.contains(leaves_and_air, grow_node.name) or find_ground(grow_pos) > 16 then
+			return
+		end
+		if minetest.get_node_light(grow_pos, nil) <= light_max then
+			minetest.set_node(pos, {name = "air"})
+			if math.random(1,27) == 1 then
+				minetest.set_node(grow_pos, {name = "fun_caves:fungal_tree_fruit"})
+			else
+				minetest.set_node(grow_pos, {name = node.name})
+			end
+		end
+	end
+})
+
+-- Fill a list with data for content IDs, after all nodes are registered
+local cid_data = {}
+minetest.after(0, function()
+	for name, def in pairs(minetest.registered_nodes) do
+		cid_data[minetest.get_content_id(name)] = {
+			name = name,
+			--drops = def.drops,
+			flammable = def.groups.flammable,
+			choppy = def.groups.choppy,
+			fleshy = def.groups.fleshy,
+			snappy = def.groups.snappy,
+			on_blast = def.on_blast,
+		}
+	end
+end)
+
+local function add_effects(pos, radius)
+	minetest.add_particlespawner({
+		amount = 128,
+		time = 1,
+		minpos = vector.subtract(pos, radius / 2),
+		maxpos = vector.add(pos, radius / 2),
+		minvel = {x=-20, y=-20, z=-20},
+		maxvel = {x=20,  y=20,  z=20},
+		minacc = vector.new(),
+		maxacc = vector.new(),
+		minexptime = 1,
+		maxexptime = 3,
+		minsize = 8,
+		maxsize = 16,
+		texture = "tnt_smoke.png",
+	})
+end
+
+local function destroy(pos, cid)
+	if minetest.is_protected(pos, "") then
+		return
+	end
+	local def = cid_data[cid]
+	if def and def.on_blast then
+		def.on_blast(vector.new(pos), 1)
+		return
+	end
+	if def.snappy == nil and def.choppy == nil and def.fleshy == nil and def.name ~= "fire:basic_flame" then
+		return
+	end
+	local new = "air"
+	--if math.random(1,2) == 1 then
+	if true then
+		local node_under = minetest.get_node_or_nil({x = pos.x,
+			y = pos.y - 1, z = pos.z})
+		if node_under and node_under.name ~= "air" then
+			--new = node.name
+		end
+	end
+	minetest.set_node(pos, {name=new})
+end
+
+local function explode(pos, radius)
+	local pos = vector.round(pos)
+	local vm = VoxelManip()
+	local p1 = vector.subtract(pos, radius)
+	local p2 = vector.add(pos, radius)
+	local minp, maxp = vm:read_from_map(p1, p2)
+	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
+	local data = vm:get_data()
+
+	local drops = {}
+	local p = {}
+
+	local c_air = minetest.get_content_id("air")
+
+	for z = -radius, radius do
+	for y = -radius, 4*radius do
+	local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
+	for x = -radius, radius do
+		if (x * x) + (y * y / 4) + (z * z) <=
+				(radius * radius) + math.random(-radius, radius) then
+			local cid = data[vi]
+			p.x = pos.x + x
+			p.y = pos.y + y
+			p.z = pos.z + z
+			if cid ~= c_air then
+				destroy(p, cid)
+			end
+		end
+		vi = vi + 1
+	end
+	end
+	end
+end
+
+local function calc_velocity(pos1, pos2, old_vel, power)
+	local vel = vector.direction(pos1, pos2)
+	vel = vector.normalize(vel)
+	vel = vector.multiply(vel, power)
+
+	-- Divide by distance
+	local dist = vector.distance(pos1, pos2)
+	dist = math.max(dist, 1)
+	vel = vector.divide(vel, dist)
+
+	-- Add old velocity
+	vel = vector.add(vel, old_vel)
+	return vel
+end
+
+local function entity_physics(pos, radius)
+	-- Make the damage radius larger than the destruction radius
+	radius = radius * 2
+	local objs = minetest.get_objects_inside_radius(pos, radius)
+	for _, obj in pairs(objs) do
+		local obj_pos = obj:getpos()
+		local obj_vel = obj:getvelocity()
+		local dist = math.max(1, vector.distance(pos, obj_pos))
+
+		if obj_vel ~= nil then
+			obj:setvelocity(calc_velocity(pos, obj_pos,
+					obj_vel, radius * 10))
+		end
+
+		local damage = (4 / dist) * radius
+		obj:set_hp(obj:get_hp() - damage)
+	end
+end
+
+
+local function boom(pos)
+	if not pos then
+		return
+	end
+	local node = minetest.get_node_or_nil(pos)
+	if not node then
+		return
+	end
+
+	minetest.sound_play("tnt_explode", {pos=pos, gain=1.5, max_hear_distance=2*64})
+	local radius = 5
+	minetest.set_node(pos, {name="air"})
+	explode(pos, radius)
+	entity_physics(pos, radius)
+	add_effects(pos, radius)
+end
+
+local function burn(pos)
+	minetest.get_node_timer(pos):start(1)
+end
+
+
+-- Exploding fruit
+minetest.register_abm({
+	nodenames = {"fun_caves:fungal_tree_fruit"},
+	interval = 3 * fun_caves.time_factor,
+	chance = 20,
+	action = function(pos, node)
+		local pos1, count = minetest.find_nodes_in_area(vector.subtract(pos, 1), vector.add(pos, 1), {"fire:basic_flame"})
+		if #pos1 > 0 then
+			boom(pos)
+			return
+		end
+
+		local pos1, count = minetest.find_nodes_in_area(vector.subtract(pos, 1), vector.add(pos, 1), fun_caves.fungal_tree_leaves)
+		if #pos1 < 3 then
+			minetest.set_node(pos, {name="air"})
+			return
+		end
+
+		local g = find_ground(pos)
+		if g > 4 and g < 17 then
+			if math.random(1,17 - g) == 1 then
+				boom(pos)
+			end
+		elseif math.random(1,2) == 1 then
+			minetest.set_node(pos, {name="air"})
+		end
+	end
+})
+
+
+minetest.register_node("fun_caves:fungal_tree_fruit", {
+	description = "Fungal tree fruit",
+	drawtype = "plantlike",
+	visual_scale = 0.75,
+	tiles = {"fun_caves_fungal_tree_fruit.png"},
+	--inventory_image = ".png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	light_source = 6,
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.2, -0.5, -0.2, 0.2, 0, 0.2}
+	},
+	groups = {fleshy = 3, dig_immediate = 3, flammable = 2},
+	--on_use = minetest.item_eat(2),
+	sounds = default.node_sound_leaves_defaults(),
+	on_timer = boom,
+	on_punch = boom,
+})
+
+

init.lua

@@ -2,9 +2,9 @@ fun_caves = {}
 fun_caves.version = "1.0"
 fun_caves.path = minetest.get_modpath(minetest.get_current_modname())
 fun_caves.world = false
+fun_caves.time_factor = 10
 
 
-if fun_caves.world then
 minetest.register_on_mapgen_init(function(mgparams)
 	minetest.set_mapgen_params({mgname="singlenode", flags="nolight"})
 end)
@@ -26,11 +26,22 @@ if fun_caves.world then
 		flowers.register_decorations()
 	end
 end
-else
-	minetest.set_mapgen_params({flags="nocaves"})
-end
 
 
+-- Check if the table contains an element.
+function table.contains(table, element)
+  for key, value in pairs(table) do
+    if value == element then
+			if key then
+				return key
+			else
+				return true
+			end
+    end
+  end
+  return false
+end
+
 -- Modify a node to add a group
 function minetest.add_group(node, groups)
 	local def = minetest.registered_items[node]
@@ -71,14 +82,17 @@ function fun_caves.node(name)
 end
 
 
---dofile(fun_caves.path .. "/nodes.lua")
+dofile(fun_caves.path .. "/nodes.lua")
+dofile(fun_caves.path .. "/fungal_tree.lua")
 dofile(fun_caves.path .. "/mapgen.lua")
 
 
-if fun_caves.world then
 minetest.register_on_newplayer(fun_caves.respawn)
 minetest.register_on_respawnplayer(fun_caves.respawn)
-end
 
 -- Inserting helps to ensure that fun_caves operates first.
 table.insert(minetest.registered_on_generateds, 1, fun_caves.generate)
+
+minetest.register_on_joinplayer(function(player)
+	player:set_sky("#000000", "plain", {})
+end)

mapgen.lua

@@ -2,27 +2,31 @@
 -- cavegen.cpp, and is likewise distributed under the LGPL2.1
 
 
---local DEBUG = true
+local DEBUG = false
+-- Cave blend distance near YMIN, YMAX
+local massive_cave_blend = 128
+-- noise threshold for massive caves
+local massive_cave_threshold = 0.6
+-- mct: 1 = small rare caves, 0.5 1/3rd ground volume, 0 = 1/2 ground volume.
+
+local seed_noise = {offset = 0, scale = 32768, seed = 5202, spread = {x = 80, y = 80, z = 80}, octaves = 2, persist = 0.4, lacunarity = 2}
+local cave_noise_v6 = {offset = 6, scale = 6, seed = 34329, spread = {x = 250, y = 250, z = 250}, octaves = 3, persist = 0.5, lacunarity = 2}
+local intersect_cave_noise_1 = {offset = 0, scale = 1, seed = -8402, spread = {x = 64, y = 64, z = 64}, octaves = 3, persist = 0.5, lacunarity = 2}
+local intersect_cave_noise_2 = {offset = 0, scale = 1, seed = 3944, spread = {x = 64, y = 64, z = 64}, octaves = 3, persist = 0.5, lacunarity = 2}
+local massive_cave_noise = {offset = 0, scale = 1, seed = 59033, spread = {x = 768, y = 256, z = 768}, octaves = 6, persist = 0.63, lacunarity = 2}
+local biome_noise = {offset = 0.0, scale = 1.0, spread = {x = 400, y = 400, z = 400}, seed = 903, octaves = 3, persist = 0.5, lacunarity = 2.0}
+local biome_blend = {offset = 0.0, scale = 0.1, spread = {x = 8, y = 8, z = 8}, seed = 4023, octaves = 2, persist = 1.0, lacunarity = 2.0}
+
+
+
 local node = fun_caves.node
 
 local data = {}
 local p2data = {}  -- vm rotation data buffer
 local lightmap = {}
-local vm, emin, emax, a, csize, heightmap, biomemap
+local vm, emin, emax, area, csize
 local div_sz_x, div_sz_z, minp, maxp, terrain, cave
 
-local terrain_noise = {offset = 0,
-scale = 20, seed = 8829, spread = {x = 40, y = 40, z = 40},
-octaves = 6, persist = 0.4, lacunarity = 2}
-
-local cave_noise = {offset = 0, scale = 1,
-seed = -3977, spread = {x = 30, y = 30, z = 30}, octaves = 3,
-persist = 0.8, lacunarity = 2}
-
-local seed_noise = {offset = 0, scale = 32768,
-seed = 5202, spread = {x = 80, y = 80, z = 80}, octaves = 2,
-persist = 0.4, lacunarity = 2}
-
 if fun_caves.world then
 	fun_caves.biomes = {}
 	local biomes = fun_caves.biomes
@@ -118,7 +122,7 @@ local function place_schematic(pos, schem, center)
 			local dz = pos.z - minp.z + z
 			local dx = pos.x - minp.x + x
 			if pos.x + x > minp.x and pos.x + x < maxp.x and pos.z + z > minp.z and pos.z + z < maxp.z then
-				local ivm = a:index(pos.x + x, pos.y, pos.z + z)
+				local ivm = area:index(pos.x + x, pos.y, pos.z + z)
 				local isch = z1 * schem.size.y * schem.size.x + x1 + 1
 				for y = 0, schem.size.y - 1 do
 					local dy = pos.y - minp.y + y
@@ -133,7 +137,7 @@ local function place_schematic(pos, schem, center)
 						end
 					end
 
-					ivm = ivm + a.ystride
+					ivm = ivm + area.ystride
 					isch = isch + schem.size.x
 				end
 			end
@@ -157,13 +161,11 @@ local function get_decoration(biome)
 end
 
 
-local np_cave = {offset = 6, scale = 6, seed = 34329, spread = {x = 250, y = 250, z = 250}, octaves = 3, persist = 0.5, lacunarity = 2}
-
 local function rangelim(x, y, z)
 	return math.max(math.min(x, z), y)
 end
 
-local function carveRoute(this, vec, f, randomize_xz, tunnel_above_ground)
+local function carveRoute(this, vec, f, randomize_xz)
 	local startp = vector.new(this.orp)
 	startp = vector.add(startp, this.of)
 
@@ -182,9 +184,6 @@ local function carveRoute(this, vec, f, randomize_xz, tunnel_above_ground)
 	for z0 = d0, d1 do
 		local si = this.rs / 2 - math.max(0, math.abs(z0) - this.rs / 7 - 1)
 		for x0 = -si - math.random(0,1), si - 1 + math.random(0,1) do
-			if (tunnel_above_ground) then
-				--continue
-			else
 			local maxabsxz = math.max(math.abs(x0), math.abs(z0))
 			local si2 = this.rs / 2 - math.max(0, maxabsxz - this.rs / 7 - 1)
 			for y0 = -si2, si2 do
@@ -196,10 +195,10 @@ local function carveRoute(this, vec, f, randomize_xz, tunnel_above_ground)
 						local p = vector.new(cp.x + x0, cp.y + y0, cp.z + z0)
 						p = vector.add(p, this.of)
 
-							if not a:containsp(p) then
+						if not area:containsp(p) then
 							--continue
 						else
-								local i = a:indexp(vector.round(p))
+							local i = area:indexp(vector.round(p))
 							local c = data[i]
 							--if (not ndef.get(c).is_ground_content) then
 							-- ** check for ground content? **
@@ -237,9 +236,8 @@ local function carveRoute(this, vec, f, randomize_xz, tunnel_above_ground)
 		end
 	end
 end
-end
 
-local function makeTunnel(this, dirswitch)
+local function makeV6Tunnel(this, dirswitch)
 	if dirswitch and not this.large_cave then
 		this.main_direction = vector.new(
 			((math.random() * 20) - 10) / 10,
@@ -285,38 +283,6 @@ local function makeTunnel(this, dirswitch)
 		)
 	end
 
-	-- Do not make caves that are entirely above ground, to fix
-	-- shadow bugs caused by overgenerated large caves.
-	-- It is only necessary to check the startpoint and endpoint.
-	local orpi = vector.new(this.orp.x, this.orp.y, this.orp.z)
-	local veci = vector.new(vec.x, vec.y, vec.z)
-	local h1
-	local h2
-
-	local p1 = vector.add(orpi, veci, this.of, this.rs / 2)
-	if (p1.z >= minp.z and p1.z <= maxp.z and
-			p1.x >= minp.x and p1.x <= maxp.x) then
-		local index1 = math.floor(p1.z - minp.z + 0.5) * csize.x + math.floor(p1.x - minp.x + 0.5) + 1
-		h1 = heightmap[index1]
-	else
-		h1 = this.water_level -- If not in heightmap
-	end
-
-	local p2 = vector.add(orpi, this.of, this.rs / 2)
-	if (p2.z >= minp.z and p2.z <= maxp.z and
-			p2.x >= minp.x and p2.x <= maxp.x) then
-		local index2 = math.floor(p2.z - minp.z + 0.5) * csize.x + math.floor(p2.x - minp.x + 0.5) + 1
-		h2 = heightmap[index2]
-	else
-		h2 = this.water_level
-	end
-
-	-- If startpoint and endpoint are above ground,
-	-- disable placing of nodes in carveRoute while
-	-- still running all pseudorandom calls to ensure
-	-- caves consistent with existing worlds.
-	local tunnel_above_ground = p1.y > h1 and p2.y > h2
-
 	vec = vector.add(vec, this.main_direction)
 
 	local rp = vector.add(this.orp, vec)
@@ -352,16 +318,15 @@ local function makeTunnel(this, dirswitch)
 	-- Carve routes
 	for f = 0, 1, 1.0 / veclen do
 		--print(dump(vec))
-		carveRoute(this, vec, f, randomize_xz, tunnel_above_ground)
+		carveRoute(this, vec, f, randomize_xz)
 	end
 
 	this.orp = rp
 end
 
-local function makeCave(this, max_stone_height)
+local function makeV6Cave(this)
-	this.max_stone_y = max_stone_height
+	this.max_stone_y = 32000
 	this.main_direction = vector.new(0, 0, 0)
-	--print(dump(this))
 
 	-- Allowed route area size in nodes
 	this.ar = vector.add(vector.subtract(maxp, minp), 1)
@@ -409,7 +374,7 @@ local function makeCave(this, max_stone_height)
 	-- Generate some tunnel starting from orp
 	for j = 0, this.tunnel_routepoints do
 		--print(dump(this.orp))
-		makeTunnel(this, j % this.dswitchint == 0)
+		makeV6Tunnel(this, j % this.dswitchint == 0)
 	end
 end
 
@@ -424,7 +389,7 @@ local function CaveV6(is_large_cave)
 	this.flooded             = true
 	this.lava_cave           = false
 
-	if maxp.y < this.water_level and minp.y / 31000 - math.random() < -0.5 then
+	if math.random(2) == 1 then
 		this.lava_cave = true
 	end
 
@@ -446,8 +411,8 @@ local function getBiome(x, z)
 	return nil
 end
 
-local function generateCaves(max_stone_y)
+local function generateV6Caves()
-	local cave_amount = minetest.get_perlin(np_cave):get2d({x=minp.x, y=minp.y})
+	local cave_amount = minetest.get_perlin(cave_noise_v6):get2d({x=minp.x, y=minp.y})
 	local volume_nodes = (maxp.x - minp.x + 1) * (maxp.y - minp.y + 1) * 16
 	cave_amount = math.max(0.0, cave_amount)
 	local caves_count = cave_amount * volume_nodes / 50000
@@ -457,17 +422,11 @@ local function generateCaves(max_stone_y)
 		bruises_count = math.random(0, math.random(0, 2))
 	end
 
-	if (getBiome(minp.x, minp.z) == "desert") then
-		caves_count = caves_count / 3
-		bruises_count = caves_count / 3
-	end
-
 	for i = 0, caves_count + bruises_count do
 		local large_cave = (i >= caves_count)
 		local cave = CaveV6(large_cave)
 
-		--print(dump(cave))
+		makeV6Cave(cave)
-		makeCave(cave, max_stone_y)
 	end
 end
 
@@ -477,20 +436,8 @@ function fun_caves.generate(p_minp, p_maxp, seed)
 	vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
 	vm:get_data(data)
 	--p2data = vm:get_param2_data()
-	a = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
+	area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
 	csize = vector.add(vector.subtract(maxp, minp), 1)
-	heightmap = minetest.get_mapgen_object("heightmap")
-
-	local max_stone_height = -40000
-	local index = 0
-	for z = minp.z, maxp.z do
-		for x = minp.x, maxp.x do
-			index = index + 1
-			if max_stone_height < heightmap[index] then
-				max_stone_height = heightmap[index]
-			end
-		end
-	end
 
 	-- Deal with memory issues. This, of course, is supposed to be automatic.
 	local mem = math.floor(collectgarbage("count")/1024)
@@ -506,31 +453,209 @@ function fun_caves.generate(p_minp, p_maxp, seed)
 	local px = math.floor((minp.x + 32) / csize.x)
 	local pz = math.floor((minp.z + 32) / csize.z)
 
-	generateCaves(max_stone_height)
+	-- Fill with stone.
+	for z = minp.z, maxp.z do
+		for y = minp.y, maxp.y do
+			local ivm = area:index(minp.x, y, z)
+			for x = minp.x, maxp.x do
+				data[ivm] = node("default:stone")
+				ivm = ivm + 1
+			end
+		end
+	end
 
-	--local index = 0
+	local made_a_big_one = false
-	--local index3d = 0
+	local massive_cave = minetest.get_perlin_map(massive_cave_noise, csize):get3dMap_flat(minp)
-	--for z = minp.z, maxp.z do
+	local cave_1 = minetest.get_perlin_map(intersect_cave_noise_1, csize):get3dMap_flat(minp)
-	--	local dz = z - minp.z
+	local cave_2 = minetest.get_perlin_map(intersect_cave_noise_2, csize):get3dMap_flat(minp)
-	--	for x = minp.x, maxp.x do
+	local biome_n = minetest.get_perlin_map(biome_noise, {x=csize.x, y=csize.z}):get2dMap_flat({x=minp.x, y=minp.z})
-	--		index = index + 1
+	local biome_bn = minetest.get_perlin_map(biome_blend, {x=csize.x, y=csize.z}):get2dMap_flat({x=minp.x, y=minp.z})
-	--		local dx = x - minp.x
-	--		index3d = dz * csize.y * csize.x + dx + 1
-	--		local ivm = a:index(x, minp.y, z)
 
-	--		for y = minp.y, maxp.y do
+	local index = 0
-	--			local dy = y - minp.y
+	local index3d = 0
+	for z = minp.z, maxp.z do
+		local dz = z - minp.z
+		for x = minp.x, maxp.x do
+			index = index + 1
+			local dx = x - minp.x
+			index3d = dz * csize.y * csize.x + dx + 1
+			local ivm = area:index(x, minp.y, z)
 
-	--			ivm = ivm + a.ystride
+			for y = minp.y, maxp.y do
-	--			index3d = index3d + csize.x
+				local dy = y - minp.y
-	--		end
+
-	--	end
+				if massive_cave[index3d] > massive_cave_threshold then
+					data[ivm] = node("air")
+					made_a_big_one = true
+				else
+					local n1 = (math.abs(cave_1[index3d]) < 0.08)
+					local n2 = (math.abs(cave_2[index3d]) < 0.08)
+
+					if n1 and n2 then
+						local sr = 1000
+						if data[ivm] == node("default:stone") then
+							sr = math.random(1000)
+						end
+
+						--if sr == 1 then
+						--	data[ivm] = node("default:lava_source")
+						--elseif sr == 2 then
+						--	data[ivm] = node("default:water_source")
+						--else
+							data[ivm] = node("air")
 						--end
+					end
+				end
+
+				ivm = ivm + area.ystride
+				index3d = index3d + csize.x
+			end
+		end
+	end
+
+	if made_a_big_one then
+		--print("massive cave at "..minp.x..","..minp.y..","..minp.z)
+	else
+		generateV6Caves()
+	end
+
+	local index = 0
+	local index3d = 0
+	for z = minp.z, maxp.z do
+		local dz = z - minp.z
+		for x = minp.x, maxp.x do
+			index = index + 1
+			local dx = x - minp.x
+			index3d = (dz + 1) * csize.y * csize.x + dx
+			local air_count = 0
+			local ivm = area:index(x, maxp.y, z)
+
+			for y = maxp.y, minp.y, -1 do
+				local ivm_below = ivm - area.ystride
+				local ivm_above = ivm + area.ystride
+				local dy = y - minp.y
+
+				if data[ivm] == node("air") then
+					-------------------
+					local stone_type = node("default:stone")
+					local stone_depth = 1
+					local biome_val = biome_n[index] + biome_bn[index]
+					if biome_val < -0.8 then
+						if true then
+							stone_type = node("default:ice")
+							stone_depth = 2
+						else
+							stone_type = node("fun_caves:thinice")
+							stone_depth = 2
+						end
+					elseif biome_val < -0.7 then
+						stone_type = node("fun_caves:stone_with_lichen")
+					elseif biome_val < -0.3 then
+						stone_type = node("fun_caves:stone_with_moss")
+					elseif biome_val < 0.2 then
+						stone_type = node("fun_caves:stone_with_lichen")
+					elseif biome_val < 0.5 then
+						stone_type = node("fun_caves:stone_with_algae")
+					elseif biome_val < 0.6 then
+						stone_type = node("fun_caves:stone_with_salt")
+						stone_depth = 2
+					elseif biome_val < 0.8 then
+						stone_type = node("default:coalblock")
+						stone_depth = 2
+					else
+						stone_type = node("fun_caves:hot_cobble")
+					end
+					--	"glow"
+
+					-- Change stone per biome.
+					if data[ivm_below] == node("default:stone") then
+						data[ivm_below] = stone_type
+						if stone_depth == 2 then
+							data[ivm_below - area.ystride] = stone_type
+						end
+					end
+					if data[ivm_above] == node("default:stone") then
+						data[ivm_above] = stone_type
+						if stone_depth == 2 then
+							data[ivm_above + area.ystride] = stone_type
+						end
+					end
+
+					if (data[ivm_above] == node("fun_caves:stone_with_lichen") or data[ivm_above] == node("fun_caves:stone_with_moss")) and math.random(1,20) == 1 then
+						data[ivm_above] = node("fun_caves:glowing_fungal_stone")
+					end
+
+					if data[ivm] == node("air") then
+						local sr = math.random(1,1000)
+
+						-- fluids
+						if (not made_a_big_one) and data[ivm_below] == node("default:stone") and sr < 10 then
+								data[ivm] = node("default:lava_source")
+						elseif (not made_a_big_one) and data[ivm_below] == node("fun_caves:stone_with_moss") and sr < 10 then
+								data[ivm] = node("default:water_source")
+						-- hanging down
+						elseif data[ivm_above] == node("default:ice") and sr < 80 then
+							data[ivm] = node("fun_caves:icicle_down")
+						elseif (data[ivm_above] == node("fun_caves:stone_with_lichen") or data[ivm_above] == node("fun_caves:stone_with_moss") or data[ivm_above] == node("fun_caves:stone_with_algae") or data[ivm_above] == node("default:stone")) and sr < 80 then
+							if data[ivm_above] == node("fun_caves:stone_with_algae") then
+								data[ivm] = node("fun_caves:stalactite_slimy")
+							elseif data[ivm_above] == node("fun_caves:stone_with_moss") then
+								data[ivm] = node("fun_caves:stalactite_mossy")
+							else
+								data[ivm] = node("fun_caves:stalactite")
+							end
+						-- standing up
+						elseif data[ivm_below] == node("default:coalblock") and sr < 20 then
+							data[ivm] = node("fun_caves:constant_flame")
+						elseif data[ivm_below] == node("default:ice") and sr < 80 then
+							data[ivm] = node("fun_caves:icicle_up")
+						elseif (data[ivm_below] == node("fun_caves:stone_with_lichen") or data[ivm_below] == node("fun_caves:stone_with_algae") or data[ivm_below] == node("default:stone") or data[ivm_below] == node("fun_caves:stone_with_moss")) and sr < 80 then
+							if data[ivm_below] == node("fun_caves:stone_with_algae") then
+								data[ivm] = node("fun_caves:stalagmite_slimy")
+							elseif data[ivm_below] == node("fun_caves:stone_with_moss") then
+								data[ivm] = node("fun_caves:stalagmite_mossy")
+							elseif data[ivm_below] == node("fun_caves:stone_with_lichen") or data[ivm_above] == node("default:stone") then
+								data[ivm] = node("fun_caves:stalagmite")
+							end
+						-- vegetation
+						elseif (data[ivm_below] == node("fun_caves:stone_with_lichen") or data[ivm_below] == node("fun_caves:stone_with_algae")) and biome_val >= -0.7 then
+							if sr < 110 then
+								data[ivm] = node("flowers:mushroom_red")
+							elseif sr < 140 then
+								data[ivm] = node("flowers:mushroom_brown")
+							elseif air_count > 1 and sr < 160 then
+								data[ivm_above] = node("fun_caves:huge_mushroom_cap")
+								data[ivm] = node("fun_caves:giant_mushroom_stem")
+							elseif air_count > 2 and sr < 170 then
+								data[ivm + 2 * area.ystride] = node("fun_caves:giant_mushroom_cap")
+								data[ivm_above] = node("fun_caves:giant_mushroom_stem")
+								data[ivm] = node("fun_caves:giant_mushroom_stem")
+							elseif made_a_big_one and air_count > 5 and sr < 180 then
+								fun_caves.make_fungal_tree(data, area, ivm, math.random(2,math.min(air_count, 12)), node(fun_caves.fungal_tree_leaves[math.random(1,#fun_caves.fungal_tree_leaves)]), node("fun_caves:fungal_tree_fruit"))
+								data[ivm_below] = node("dirt")
+							elseif sr < 300 then
+								data[ivm_below] = node("dirt")
+							end
+							if data[ivm] ~= node("air") then
+								data[ivm_below] = node("dirt")
+							end
+						end
+					end
+
+					if data[ivm] == node("air") then
+						air_count = air_count + 1
+					end
+				end
+
+				ivm = ivm - area.ystride
+				index3d = index3d - csize.x
+			end
+		end
+	end
 
 
 	vm:set_data(data)
-	--minetest.generate_ores(vm, minp, maxp)
+	minetest.generate_ores(vm, minp, maxp)
-	--minetest.generate_decorations(vm, minp, maxp)
 	--vm:set_param2_data(p2data)
 	if DEBUG then
 		vm:set_lighting({day = 15, night = 15})
@@ -541,5 +666,36 @@ function fun_caves.generate(p_minp, p_maxp, seed)
 	vm:update_liquids()
 	vm:write_to_map()
 
-	vm, a, lightmap, heightmap, biomemap, terrain, cave = nil, nil, nil, nil, nil, nil, nil
+	vm, area, lightmap, terrain, cave = nil, nil, nil, nil, nil
+end
+
+function fun_caves.respawn(player)
+	local pos = {x=0,y=0,z=0}
+	local massive_cave = minetest.get_perlin(massive_cave_noise):get3d(pos)
+	local biome_n = minetest.get_perlin(biome_noise):get2d({x=pos.x, y=pos.z})
+	local biome_bn = minetest.get_perlin(biome_blend):get2d({x=pos.x, y=pos.z})
+	local biome = biome_n + biome_bn
+
+	while biome < 0.3 or biome > 0.5 do
+		pos.x = pos.x + math.random(20) - 10
+		pos.z = pos.z + math.random(20) - 10
+
+		biome_n = minetest.get_perlin(biome_noise):get2d({x=pos.x, y=pos.z})
+		biome_bn = minetest.get_perlin(biome_blend):get2d({x=pos.x, y=pos.z})
+		biome = biome_n + biome_bn
+	end
+
+	while massive_cave <= massive_cave_threshold do
+		pos.y = pos.y + 80
+		massive_cave = minetest.get_perlin(massive_cave_noise):get3d(pos)
+	end
+
+	while massive_cave > massive_cave_threshold do
+		pos.y = pos.y - 1
+		massive_cave = minetest.get_perlin(massive_cave_noise):get3d(pos)
+	end
+
+	pos.y = pos.y + 1
+	player:setpos(pos)
+	return true -- Disable default player spawner
 end

nodes.lua

@@ -0,0 +1,544 @@
+----------------------
+-- Cave Decorations --
+----------------------
+
+-- Mushrooms and Speleothems
+--  These are instantiated by voxel.lua since the decoration manager
+--   only works at the surface of the world.
+
+local light_max = 12
+
+minetest.register_node("fun_caves:huge_mushroom_cap", {
+	description = "Huge Mushroom Cap",
+	tiles = {"vmg_mushroom_giant_cap.png", "vmg_mushroom_giant_under.png", "vmg_mushroom_giant_cap.png"},
+	is_ground_content = false,
+	paramtype = "light",
+	drawtype = "nodebox",
+	node_box = { type = "fixed", 
+		fixed = {
+			{-0.5, -0.5, -0.33, 0.5, -0.33, 0.33}, 
+			{-0.33, -0.5, 0.33, 0.33, -0.33, 0.5}, 
+			{-0.33, -0.5, -0.33, 0.33, -0.33, -0.5}, 
+			{-0.33, -0.33, -0.33, 0.33, -0.17, 0.33}, 
+		} },
+	light_source = 10,
+	groups = {fleshy=1, dig_immediate=3, flammable=2, plant=1, leafdecay=1},
+})
+
+minetest.register_node("fun_caves:giant_mushroom_cap", {
+	description = "Giant Mushroom Cap",
+	tiles = {"vmg_mushroom_giant_cap.png", "vmg_mushroom_giant_under.png", "vmg_mushroom_giant_cap.png"},
+	is_ground_content = false,
+	paramtype = "light",
+	drawtype = "nodebox",
+	node_box = { type = "fixed", 
+		fixed = {
+			{-0.4, -0.5, -0.4, 0.4, 0.0, 0.4},
+			{-0.75, -0.5, -0.4, -0.4, -0.25, 0.4},
+			{0.4, -0.5, -0.4, 0.75, -0.25, 0.4},
+			{-0.4, -0.5, -0.75, 0.4, -0.25, -0.4},
+			{-0.4, -0.5, 0.4, 0.4, -0.25, 0.75},
+		} },
+	light_source = 10,
+	groups = {fleshy=1, dig_immediate=3, flammable=2, plant=1, leafdecay=1},
+})
+
+minetest.register_node("fun_caves:giant_mushroom_stem", {
+	description = "Giant Mushroom Stem",
+	tiles = {"vmg_mushroom_giant_stem.png", "vmg_mushroom_giant_stem.png", "vmg_mushroom_giant_stem.png"},
+	is_ground_content = false,
+	groups = {tree=1,choppy=2,oddly_breakable_by_hand=1,flammable=2, plant=1},
+	sounds = default.node_sound_wood_defaults(),
+	paramtype = "light",
+	drawtype = "nodebox",
+	node_box = { type = "fixed", fixed = { {-0.25, -0.5, -0.25, 0.25, 0.5, 0.25}, }},
+})
+
+-- Mushroom stems can be used as wood, ala Journey to the Center of the Earth.
+minetest.register_craft({
+	output = "default:wood",
+	recipe = {
+		{"fun_caves:giant_mushroom_stem"}
+	}
+})
+
+-- Caps can be cooked and eaten.
+minetest.register_node("fun_caves:mushroom_steak", {
+	description = "Mushroom Steak",
+	drawtype = "plantlike",
+	paramtype = "light",
+	tiles = {"vmg_mushroom_steak.png"},
+	inventory_image = "vmg_mushroom_steak.png",
+	on_use = minetest.item_eat(4),
+	groups = {dig_immediate = 3, attached_node = 1},
+})
+
+minetest.register_craft({
+	type = "cooking",
+	output = "fun_caves:mushroom_steak",
+	recipe = "fun_caves:huge_mushroom_cap",
+	cooktime = 2,
+})
+
+minetest.register_craft({
+	type = "cooking",
+	output = "fun_caves:mushroom_steak 2",
+	recipe = "fun_caves:giant_mushroom_cap",
+	cooktime = 2,
+})
+
+-- Glowing fungal stone provides an eerie light.
+minetest.register_node("fun_caves:glowing_fungal_stone", {
+	description = "Glowing Fungal Stone",
+	tiles = {"default_stone.png^vmg_glowing_fungal.png",},
+	is_ground_content = true,
+	light_source = 12,
+	groups = {cracky=3, stone=1},
+	drop = {items={ {items={"default:cobble"},}, {items={"fun_caves:glowing_fungus",},},},},
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("fun_caves:glowing_fungus", {
+	description = "Glowing Fungus",
+	drawtype = "plantlike",
+	paramtype = "light",
+	tiles = {"vmg_glowing_fungus.png"},
+	inventory_image = "vmg_glowing_fungus.png",
+	groups = {dig_immediate = 3, attached_node = 1},
+})
+
+-- The fungus can be made into juice and then into glowing glass.
+minetest.register_node("fun_caves:moon_juice", {
+	description = "Moon Juice",
+	drawtype = "plantlike",
+	paramtype = "light",
+	tiles = {"vmg_moon_juice.png"},
+	inventory_image = "vmg_moon_juice.png",
+	groups = {dig_immediate = 3, attached_node = 1},
+	sounds = default.node_sound_glass_defaults(),
+})
+
+minetest.register_node("fun_caves:moon_glass", {
+	description = "Moon Glass",
+	drawtype = "glasslike",
+	tiles = {"default_glass.png",},
+	inventory_image = minetest.inventorycube("default_glass.png"),
+	is_ground_content = true,
+	light_source = default.LIGHT_MAX,
+	groups = {cracky=3},
+	sounds = default.node_sound_glass_defaults(),
+})
+
+minetest.register_craft({
+	output = "fun_caves:moon_juice",
+	recipe = {
+		{"fun_caves:glowing_fungus", "fun_caves:glowing_fungus", "fun_caves:glowing_fungus"},
+		{"fun_caves:glowing_fungus", "fun_caves:glowing_fungus", "fun_caves:glowing_fungus"},
+		{"fun_caves:glowing_fungus", "vessels:glass_bottle", "fun_caves:glowing_fungus"},
+	},
+})
+
+minetest.register_craft({
+	output = "fun_caves:moon_glass",
+	type = "shapeless",
+	recipe = {
+		"fun_caves:moon_juice",
+		"fun_caves:moon_juice",
+		"default:glass",
+	},
+})
+
+-- What's a cave without speleothems?
+local spel = {
+	{type1="stalactite", type2="stalagmite", tile="default_stone.png"},
+	{type1="stalactite_slimy", type2="stalagmite_slimy", tile="default_stone.png^fun_caves_algae.png"},
+	{type1="stalactite_mossy", type2="stalagmite_mossy", tile="default_stone.png^fun_caves_moss.png"},
+	{type1="icicle_down", type2="icicle_up", desc="Icicle", tile="caverealms_thin_ice.png", drop="default:ice"},
+}
+
+for _, desc in pairs(spel) do
+	minetest.register_node("fun_caves:"..desc.type1, {
+		description = (desc.desc or "Stalactite"),
+		tiles = {desc.tile},
+		is_ground_content = true,
+		walkable = false,
+		paramtype = "light",
+		--light_source = 14,
+		drop = (desc.drop or "fun_caves:stalactite"),
+		drawtype = "nodebox",
+		node_box = { type = "fixed", 
+			fixed = {
+				{-0.07, 0.0, -0.07, 0.07, 0.5, 0.07}, 
+				{-0.04, -0.25, -0.04, 0.04, 0.0, 0.04}, 
+				{-0.02, -0.5, -0.02, 0.02, 0.25, 0.02}, 
+			} },
+		groups = {rock=1, cracky=3},
+		sounds = default.node_sound_stone_defaults(),
+	})
+
+	minetest.register_node("fun_caves:"..desc.type2, {
+		description = (desc.desc or "Stalagmite"),
+		tiles = {desc.tile},
+		is_ground_content = true,
+		walkable = false,
+		paramtype = "light",
+		--light_source = 14,
+		drop = "fun_caves:stalagmite",
+		drawtype = "nodebox",
+		node_box = { type = "fixed", 
+			fixed = {
+				{-0.07, -0.5, -0.07, 0.07, 0.0, 0.07}, 
+				{-0.04, 0.0, -0.04, 0.04, 0.25, 0.04}, 
+				{-0.02, 0.25, -0.02, 0.02, 0.5, 0.02}, 
+			} },
+		groups = {rock=1, cracky=3},
+		sounds = default.node_sound_stone_defaults(),
+	})
+end
+
+-- They can be made into cobblestone, to get them out of inventory.
+minetest.register_craft({
+	output = "default:cobble",
+	recipe = {
+		{"", "", ""},
+		{"fun_caves:stalactite", "fun_caves:stalactite", ""},
+		{"fun_caves:stalactite", "fun_caves:stalactite", ""},
+	},
+})
+
+minetest.register_craft({
+	output = "default:cobble",
+	recipe = {
+		{"", "", ""},
+		{"fun_caves:stalagmite", "fun_caves:stalagmite", ""},
+		{"fun_caves:stalagmite", "fun_caves:stalagmite", ""},
+	},
+})
+
+minetest.register_node("fun_caves:glowing_dirt", {
+	description = "Glowing Dirt",
+	tiles = {"default_dirt.png"},
+	groups = {crumbly = 3, soil = 1},
+	light_source = default.LIGHT_MAX,
+	sounds = default.node_sound_dirt_defaults(),
+	soil = {
+		base = "fun_caves:glowing_dirt",
+		dry = "fun_caves:glowing_soil",
+		wet = "fun_caves:glowing_soil_wet"
+	},
+})
+
+minetest.register_node("fun_caves:glowing_soil", {
+	description = "Glowing Soil",
+	tiles = {"default_dirt.png^farming_soil.png", "default_dirt.png"},
+	drop = "fun_caves:glowing_dirt",
+	groups = {crumbly=3, not_in_creative_inventory=1, soil=2, grassland = 1, field = 1},
+	sounds = default.node_sound_dirt_defaults(),
+	light_source = default.LIGHT_MAX,
+	soil = {
+		base = "fun_caves:glowing_dirt",
+		dry = "fun_caves:glowing_soil",
+		wet = "fun_caves:glowing_soil_wet"
+	},
+})
+
+minetest.register_node("fun_caves:glowing_soil_wet", {
+	description = "Wet Glowing Soil",
+	tiles = {"default_dirt.png^farming_soil_wet.png", "default_dirt.png^farming_soil_wet_side.png"},
+	drop = "fun_caves:glowing_dirt",
+	groups = {crumbly=3, not_in_creative_inventory=1, soil=3, wet = 1, grassland = 1, field = 1},
+	sounds = default.node_sound_dirt_defaults(),
+	light_source = default.LIGHT_MAX,
+	soil = {
+		base = "fun_caves:glowing_dirt",
+		dry = "fun_caves:glowing_soil",
+		wet = "fun_caves:glowing_soil_wet"
+	},
+})
+
+minetest.register_craft({
+	output = "fun_caves:glowing_dirt",
+	type = "shapeless",
+	recipe = {
+		"fun_caves:moon_juice",
+		"default:dirt",
+	},
+})
+
+--thin (transparent) ice
+minetest.register_node("fun_caves:thin_ice", {
+	description = "Thin Ice",
+	tiles = {"caverealms_thin_ice.png"},
+	is_ground_content = true,
+	groups = {cracky=3},
+	sounds = default.node_sound_glass_defaults(),
+	use_texture_alpha = true,
+	light_source = 1,
+	drawtype = "glasslike",
+	sunlight_propagates = true,
+	freezemelt = "default:water_source",
+	paramtype = "light",
+})
+
+minetest.register_node("fun_caves:stone_with_moss", {
+	description = "Cave Stone with Moss",
+	tiles = {"default_stone.png^fun_caves_moss.png"},
+	is_ground_content = true,
+	light_source = 10,
+	groups = {stone=1, crumbly=3},
+	drop = 'default:cobble',
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.25},
+	}),
+})
+
+minetest.register_node("fun_caves:stone_with_lichen", {
+	description = "Cave Stone with Lichen",
+	tiles = {"default_stone.png^fun_caves_lichen.png"},
+	is_ground_content = true,
+	light_source = 10,
+	groups = {stone=1, crumbly=3},
+	drop = 'default:cobble',
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.25},
+	}),
+})
+
+minetest.register_node("fun_caves:stone_with_algae", {
+	description = "Cave Stone with Algae",
+	tiles = {"default_stone.png^fun_caves_algae.png"},
+	is_ground_content = true,
+	light_source = 10,
+	groups = {stone=1, crumbly=3},
+	drop = 'default:cobble',
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.25},
+	}),
+})
+
+minetest.register_node("fun_caves:stone_with_salt", {
+	description = "Cave Stone with Salt",
+	tiles = {"caverealms_salty2.png"},--{"caverealms_salty2.png^caverealms_salty.png", "caverealms_salty2.png", "caverealms_salty2.png^caverealms_salty_side.png"},
+	light_source = 9,
+	paramtype = "light",
+	use_texture_alpha = true,
+	drawtype = "glasslike",
+	sunlight_propagates = true,
+	is_ground_content = true,
+	groups = {stone=1, crumbly=3},
+	sounds = default.node_sound_glass_defaults(),
+})
+
+--Glow Obsidian
+minetest.register_node("fun_caves:glow_obsidian", {
+	description = "Glowing Obsidian",
+	tiles = {"caverealms_glow_obsidian.png"},
+	is_ground_content = true,
+	groups = {stone=2, crumbly=1},
+	light_source = 7,
+	sounds = default.node_sound_stone_defaults({
+		footstep = {name="default_stone_footstep", gain=0.25},
+	}),
+})
+
+--Glow Obsidian 2 - has traces of lava
+minetest.register_node("fun_caves:glow_obsidian_2", {
+	description = "Hot Glow Obsidian",
+	tiles = {"caverealms_glow_obsidian2.png"},
+	is_ground_content = true,
+	groups = {stone=2, crumbly=1, hot=1},
+	damage_per_second = 1,
+	light_source = 9,
+	sounds = default.node_sound_stone_defaults({
+		footstep = {name="default_stone_footstep", gain=0.25},
+	}),
+})
+
+
+--minetest.register_node("fun_caves:bright_air", {
+--	drawtype = "glasslike",
+--	tiles = {"technic_light.png"},
+--	paramtype = "light",
+--	groups = {not_in_creative_inventory=1},
+--	drop = "",
+--	walkable = false,
+--	buildable_to = true,
+--	sunlight_propagates = true,
+--	light_source = LIGHT_MAX,
+--	pointable = false,
+--})
+
+--define special flame so that it does not expire
+minetest.register_node("fun_caves:constant_flame", {
+	description = "Fire",
+	drawtype = "plantlike",
+	tiles = {{
+		name="fire_basic_flame_animated.png",
+		animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=1},
+	}},
+	inventory_image = "fire_basic_flame.png",
+	light_source = 14,
+	groups = {igniter=2,dig_immediate=3,hot=3, not_in_creative_inventory=1},
+	drop = '',
+	walkable = false,
+	buildable_to = true,
+	damage_per_second = 4,
+})
+
+--Hot Cobble - cobble with lava instead of mortar XD
+minetest.register_node("fun_caves:hot_cobble", {
+	description = "Hot Cobble",
+	tiles = {"caverealms_hot_cobble.png"},
+	is_ground_content = true,
+	groups = {crumbly=2, hot=1},
+	damage_per_second = 1,
+	light_source = 6,
+	sounds = default.node_sound_stone_defaults({
+		footstep = {name="default_stone_footstep", gain=0.25},
+	}),
+})
+
+-- mushroom growth
+minetest.register_abm({
+	nodenames = {"flowers:mushroom_brown", "flowers:mushroom_red"},
+	interval = 50 * fun_caves.time_factor,
+	chance = 100,
+	action = function(pos, node)
+		local pos_up = {x=pos.x,y=pos.y+1,z=pos.z}
+		local node_up = minetest.get_node_or_nil(pos_up)
+		if not node_up then
+			return
+		end
+		if node_up.name ~= "air" then
+			return
+		end
+		local node_under = minetest.get_node_or_nil({x = pos.x, y = pos.y - 1, z = pos.z})
+		if not node_under then
+			return
+		end
+		if minetest.get_item_group(node_under.name, "soil") ~= 0 and
+				minetest.get_node_light(pos_up, nil) <= light_max then
+			minetest.set_node(pos_up, {name = "fun_caves:huge_mushroom_cap"})
+			minetest.set_node(pos, {name = "fun_caves:giant_mushroom_stem"})
+		end
+	end
+})
+
+-- mushroom growth
+minetest.register_abm({
+	nodenames = {"fun_caves:huge_mushroom_cap"},
+	interval = 100 * fun_caves.time_factor,
+	chance = 150,
+	action = function(pos, node)
+		if minetest.get_node_light(pos, nil) >= 14 then
+			minetest.set_node(pos, {name = "air"})
+			return
+		end
+		local pos_up = {x=pos.x,y=pos.y+1,z=pos.z}
+		local node_up = minetest.get_node_or_nil(pos_up)
+		if not node_up then
+			return
+		end
+		if node_up.name ~= "air" then
+			return
+		end
+		local node_under = minetest.get_node_or_nil({x = pos.x, y = pos.y - 1, z = pos.z})
+		if not node_under or node_under.name ~= "fun_caves:giant_mushroom_stem" then
+			return
+		end
+		node_under = minetest.get_node_or_nil({x = pos.x, y = pos.y - 2, z = pos.z})
+		if not node_under then
+			return
+		end
+		if minetest.get_item_group(node_under.name, "soil") ~= 0 and
+				minetest.get_node_light(pos_up, nil) <= light_max then
+			minetest.set_node(pos_up, {name = "fun_caves:giant_mushroom_cap"})
+			minetest.set_node(pos, {name = "fun_caves:giant_mushroom_stem"})
+		end
+	end
+})
+
+-- mushroom growth
+minetest.register_abm({
+	nodenames = {"fun_caves:giant_mushroom_stem"},
+	interval = 5 * fun_caves.time_factor,
+	chance = 5,
+	action = function(pos, node)
+		local pos_up = {x=pos.x,y=pos.y+1,z=pos.z}
+		local node_up = minetest.get_node_or_nil(pos_up)
+		if not node_up then
+			return
+		end
+		if node_up.name ~= "air" then
+			return
+		end
+		if minetest.get_node_light(pos_up, nil) <= light_max then
+			minetest.set_node(pos_up, {name = "fun_caves:huge_mushroom_cap"})
+		end
+	end
+})
+
+-- mushroom spread
+minetest.register_abm({
+	nodenames = {"fun_caves:giant_mushroom_cap", "fun_caves:huge_mushroom_cap"},
+	interval = 3 * fun_caves.time_factor,
+	chance = 40,
+	action = function(pos, node)
+		if minetest.get_node_light(pos, nil) >= 14 then
+			minetest.set_node(pos, {name = "air"})
+			return
+		end
+		local pos_down = pos
+		pos_down.y = pos_down.y - 1
+		local pos1, count = minetest.find_nodes_in_area_under_air(vector.subtract(pos_down, 4), vector.add(pos_down, 4), {"group:soil"})
+		if #pos1 < 1 then
+			return
+		end
+		local random = pos1[math.random(1, #pos1)]
+		random.y = random.y + 1
+		local mushroom_type
+		if math.random(1,2) == 1 then
+			mushroom_type = "flowers:mushroom_red"
+		else
+			mushroom_type = "flowers:mushroom_brown"
+		end
+		if minetest.get_node_light(random, nil) <= light_max then
+			minetest.set_node(random, {name = mushroom_type})
+		end
+	end
+})
+
+-- Mushroom spread and death
+minetest.register_abm({
+	nodenames = {"flowers:mushroom_brown", "flowers:mushroom_red"},
+	interval = 3 * fun_caves.time_factor,
+	chance = 50,
+	action = function(pos, node)
+		if minetest.get_node_light(pos, nil) == 15 then
+			minetest.remove_node(pos)
+			return
+		end
+		local random = {
+			x = pos.x + math.random(-2, 2),
+			y = pos.y + math.random(-1, 1),
+			z = pos.z + math.random(-2, 2)
+		}
+		local random_node = minetest.get_node_or_nil(random)
+		if not random_node or random_node.name ~= "air" then
+			return
+		end
+		local node_under = minetest.get_node_or_nil({x = random.x,
+			y = random.y - 1, z = random.z})
+		if not node_under then
+			return
+		end
+
+		if (minetest.get_item_group(node_under.name, "soil") ~= 0 or
+				minetest.get_item_group(node_under.name, "tree") ~= 0) and
+				minetest.get_node_light(pos, 0.5) <= light_max and
+				minetest.get_node_light(random, 0.5) <= light_max then
+			minetest.set_node(random, {name = node.name})
+		end
+	end
+})
+