Change License

Unfortunately there is no easy way to create very rare biomes in minetest.

/info.txt

@@ -1,2 +0,0 @@
-frying from http://freesound.org/people/davidkay/sounds/132472/ (WTFPL)
-cutting from http://freesound.org/people/nhaudio/sounds/192416/ (WTFPL)

/old_mapgen.lua

@@ -1,203 +0,0 @@
---[[
-function riesenpilz_circle(nam, pos, radius, rand, seed)
-	local ra = seed
-	for i = -radius, radius, 1 do
-		for j = -radius, radius, 1 do
-			if math.floor(	math.sqrt(i^2+j^2)	+0.5) == radius then
-				random = PseudoRandom(ra)
-				p={x=pos.x+i, y=pos.y, z=pos.z+j}
-				if minetest.get_node(p).name == "air"
-				and random:next(1,rand) == 1
-				and minetest.get_node({x=pos.x+i, y=pos.y-1, z=pos.z+j}).name ~= "air" then
-					minetest.add_node(p, {name=nam})
-				end
-				ra = ra+1
-			end
-		end
-	end
-end
-
-						elseif pr:next(1,80) == 1 then
-							riesenpilz_circle("riesenpilz:brown", boden, pr:next(2,3), 3, seed)
-						elseif pr:next(1,90) == 1 then
-							riesenpilz_circle("riesenpilz:red", boden, pr:next(3,4), 3, seed)
-						elseif pr:next(1,100) == 1 then
-							riesenpilz_circle("riesenpilz:fly_agaric", boden, 3, 3, seed)
-						elseif pr:next(1,4000) == 1 then
-							riesenpilz_circle("riesenpilz:lavashroom", boden, pr:next(4,5), 3, seed)
-						elseif pr:next(1,5000) == 1 then
-							riesenpilz_circle("riesenpilz:glowshroom", boden, 2, 3, seed)
-]]
-function riesenpilz_circle(nam, pos, radius, chance)
-	for i = -radius, radius, 1 do
-		for j = -radius, radius, 1 do
-			if math.floor(	math.sqrt(i^2+j^2)	+0.5) == radius
-			and minetest.get_node({x=pos.x+i, y=pos.y, z=pos.z+j}).name == "air"
-			and math.random(1,chance) == 1
-			and minetest.get_node({x=pos.x+i, y=pos.y-1, z=pos.z+j}).name == "riesenpilz:ground" then
-				minetest.add_node({x=pos.x+i, y=pos.y, z=pos.z+j}, {name=nam})
-			end
-		end
-	end
-end
-
-local function find_ground(pos, nodes)
-	for _, evground in ipairs(nodes) do
-		if minetest.get_node(pos).name == evground then
-			return true
-		end
-	end
-	return false
-end
-
-local GROUND	=	{"default:dirt_with_grass","default:dirt","default:sand","default:desert_sand"}
-USUAL_STUFF =	{"default:leaves","default:apple","default:tree","default:cactus","default:papyrus"}
-minetest.register_on_generated(function(minp, maxp, seed)
-	if maxp.y >= -10 then
-		local x0,z0,x1,z1 = minp.x,minp.z,maxp.x,maxp.z	-- Assume X and Z lengths are equal
-		local env = minetest.env	--Should make things a bit faster.
-		local perlin1 = env:get_perlin(11,3, 0.5, 200)	--Get map specific perlin
-
-		--[[if not (perlin1:get2d({x=x0, y=z0}) > 0.53) and not (perlin1:get2d({x=x1, y=z1}) > 0.53)
-		and not (perlin1:get2d({x=x0, y=z1}) > 0.53) and not (perlin1:get2d({x=x1, y=z0}) > 0.53)
-		and not (perlin1:get2d({x=(x1-x0)/2, y=(z1-z0)/2}) > 0.53) then]]
-		if not ( perlin1:get2d( {x=x0, y=z0} ) > 0.53 ) 					--top left
-		and not ( perlin1:get2d( { x = x0 + ( (x1-x0)/2), y=z0 } ) > 0.53 )--top middle
-		and not (perlin1:get2d({x=x1, y=z1}) > 0.53) 						--bottom right
-		and not (perlin1:get2d({x=x1, y=z0+((z1-z0)/2)}) > 0.53) 			--right middle
-		and not (perlin1:get2d({x=x0, y=z1}) > 0.53)  						--bottom left
-		and not (perlin1:get2d({x=x1, y=z0}) > 0.53)						--top right
-		and not (perlin1:get2d({x=x0+((x1-x0)/2), y=z1}) > 0.53) 			--left middle
-		and not (perlin1:get2d({x=(x1-x0)/2, y=(z1-z0)/2}) > 0.53) 			--middle
-		and not (perlin1:get2d({x=x0, y=z1+((z1-z0)/2)}) > 0.53) then		--bottom middle
-			print("abortsumpf")
-			return
-		end
-		local divs = (maxp.x-minp.x);
-		local pr = PseudoRandom(seed+68)
-
-		--remove usual stuff
-		local trees = env:find_nodes_in_area(minp, maxp, USUAL_STUFF)
-		for i,v in pairs(trees) do
-			env:remove_node(v)
-		end
-
-		--Information:
-		local geninfo = "-#- giant mushrooms generate: x=["..minp.x.."; "..maxp.x.."] z=["..minp.z.."; "..maxp.z.."]"
-		print(geninfo)
-		minetest.chat_send_all(geninfo)
-
-		local smooth = riesenpilz.smooth
-
-		for j=0,divs do
-			for i=0,divs do
-				local x,z = x0+i,z0+j
-
-				--Check if we are in a "riesenpilz biome"
-				local in_biome = false
-				local test = perlin1:get2d({x=x, y=z})
-				--smooth mapgen
-				if smooth and (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
-					in_biome = true
-				elseif (not smooth) and test > 0.53 then
-					in_biome = true
-				end
-
-				if in_biome then
-
-					local ground_y = nil --Definition des Bodens:
-					for y=maxp.y,0,-1 do
-						if find_ground({x=x,y=y,z=z}, GROUND) then
-							ground_y = y
-							break
-						end
-					end
-					if ground_y then
-						env:add_node({x=x,y=ground_y,z=z}, {name="riesenpilz:ground"})
-						for i = -1,-5,-1 do
-							local pos = {x=x,y=ground_y+i,z=z}
-							if env:get_node(pos).name == "default:desert_sand" then
-								env:add_node(pos, {name="default:dirt"})
-							else
-								break
-							end
-						end
-						local boden = {x=x,y=ground_y+1,z=z}
-						if pr:next(1,15) == 1 then
-							env:add_node(boden, {name="default:dry_shrub"})
-						elseif pr:next(1,80) == 1 then
-							riesenpilz_circle("riesenpilz:brown", boden, pr:next(3,4), 3)
-						elseif pr:next(1,90) == 1 then
-							riesenpilz_circle("riesenpilz:red", boden, pr:next(4,5), 3)
-						elseif pr:next(1,100) == 1 then
-							riesenpilz_circle("riesenpilz:fly_agaric", boden, 4, 3)
-						elseif pr:next(1,4000) == 1 then
-							riesenpilz_circle("riesenpilz:lavashroom", boden, pr:next(5,6), 3)
-						elseif pr:next(1,5000) == 1 then
-							riesenpilz_circle("riesenpilz:glowshroom", boden, 3, 3)
-						--[[elseif pr:next(1,80) == 1 then
-							env:add_node(boden, {name="riesenpilz:brown"})
-						elseif pr:next(1,90) == 1 then
-							env:add_node(boden, {name="riesenpilz:red"})
-						elseif pr:next(1,100) == 1 then
-							env:add_node(boden, {name="riesenpilz:fly_agaric"})
-						elseif pr:next(1,4000) == 1 then
-							env:add_node(boden, {name="riesenpilz:lavashroom"})
-						elseif pr:next(1,5000) == 1 then
-							env:add_node(boden, {name="riesenpilz:glowshroom"})]]
-						elseif pr:next(1,380) == 1 then
-							riesenpilz_hybridpilz(boden)
-						elseif pr:next(1,340) == 10 then
-							riesenpilz_brauner_minecraftpilz(boden)
-						elseif pr:next(1,390) == 20 then
-							riesenpilz_minecraft_fliegenpilz(boden)
-						elseif pr:next(1,6000) == 2 and pr:next(1,200) == 15 then
-							riesenpilz_lavashroom(boden)
-						end
-					end
-				end
-			end
-		end
-	end
-	if maxp.y < -10 then
-		local x0,z0,x1,z1 = minp.x,minp.z,maxp.x,maxp.z	-- Assume X and Z lengths are equal
-		local env = minetest.env	--Should make things a bit faster.
-		local perlin1 = env:get_perlin(11,3, 0.5, 200)	--Get map specific perlin
-
-		--[[if not (perlin1:get2d({x=x0, y=z0}) > 0.53) and not (perlin1:get2d({x=x1, y=z1}) > 0.53)
-		and not (perlin1:get2d({x=x0, y=z1}) > 0.53) and not (perlin1:get2d({x=x1, y=z0}) > 0.53)
-		and not (perlin1:get2d({x=(x1-x0)/2, y=(z1-z0)/2}) > 0.53) then]]
-		if not ( perlin1:get2d( {x=x0, y=z0} ) > 0.53 ) 					--top left
-		and not ( perlin1:get2d( { x = x0 + ( (x1-x0)/2), y=z0 } ) > 0.53 )--top middle
-		and not (perlin1:get2d({x=x1, y=z1}) > 0.53) 						--bottom right
-		and not (perlin1:get2d({x=x1, y=z0+((z1-z0)/2)}) > 0.53) 			--right middle
-		and not (perlin1:get2d({x=x0, y=z1}) > 0.53)  						--bottom left
-		and not (perlin1:get2d({x=x1, y=z0}) > 0.53)						--top right
-		and not (perlin1:get2d({x=x0+((x1-x0)/2), y=z1}) > 0.53) 			--left middle
-		and not (perlin1:get2d({x=(x1-x0)/2, y=(z1-z0)/2}) > 0.53) 			--middle
-		and not (perlin1:get2d({x=x0, y=z1+((z1-z0)/2)}) > 0.53) then		--bottom middle
-			print("abortsumpf")
-			return
-		end
-		local divs = (maxp.x-minp.x);
-		local pr = PseudoRandom(seed+68)
-
-		for j=0,divs do
-			for i=0,divs do
-				local x,z = x0+i,z0+j
-
-				for y=minp.y,maxp.y,1 do
-					local pos = {x=x, y=y, z=z}
-
-					if env:get_node(pos).name == "air"
-					and env:get_node({x=x, y=y-1, z=z}).name == "default:stone"
-					and pr:next(1,40) == 33
-					and env:find_node_near(pos, 4, "group:igniter")
-					and not env:find_node_near(pos, 3, "group:igniter") then
-						env:add_node(pos, {name="riesenpilz:lavashroom"})
-					end
-				end
-			end
-		end
-	end
-end)

.luacheckrc

@@ -0,0 +1,3 @@
+read_globals = {"minetest", "vector", "PseudoRandom", "ItemStack", "VoxelArea",
+	"table", "dump", "default"}
+globals = {"riesenpilz"}

LICENSE.txt

@@ -1,6 +1,9 @@
-------Mushrooms------
-— glowshroom and lavashroom from bas080's plants mod (WTFPL)
-— parasol mushroom from a mod called mushrooms (WTFPL)
-— "45" mushrooms from r01922090's mush45 mod (WTFPL)
+Sounds and textures
+	CC by 3.0
+Code
+	MIT
 
-rest also WTFPL
+Some source information:
+— glowshroom and lavashroom from bas080's plants mod (originally WTFPL)
+— parasol mushroom from a mod called mushrooms (originally WTFPL)
+— "45" mushrooms from r01922090's mush45 mod (originally WTFPL)

README.md

@@ -2,9 +2,9 @@
 
 This mod adds mushrooms to minetest. The growing tool can make them giant.
 
-**Depends:** see [depends.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/depends.txt)  
-**License:** see [LICENSE.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/LICENSE.txt)  
-**Download:** [zip](https://github.com/HybridDog/riesenpilz/archive/master.zip), [tar.gz](https://github.com/HybridDog/riesenpilz/archive/master.tar.gz)  
+**Depends:** see [depends.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/depends.txt)<br/>
+**License:** see [LICENSE.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/LICENSE.txt)<br/>
+**Download:** [zip](https://github.com/HybridDog/riesenpilz/archive/master.zip), [tar.gz](https://github.com/HybridDog/riesenpilz/archive/master.tar.gz)<br/>
 
 ![I'm a screenshot!](https://cloud.githubusercontent.com/assets/3192173/5332059/421c735a-7e47-11e4-88cc-b9ed90b659a8.png)
 
@@ -12,7 +12,14 @@ If you got ideas or found bugs, please tell them to me.
 
 
 TODO:
-— add more giant mushrooms  
-— finish supporting the mushrooms mod  
-— add lava suit  
-— eating must become possible
+* Mapgen: Do not use a fixed table of tree nodes; instead use a more flexible
+  way to remove trees.
+* Add a settingtypes.txt
+* Make the growingtool craftable
+* Test if visual_scale is useful for the small mushroom nodes,
+  e.g. to make textures smaller or to use power-of-two sized textures.
+  Nodeboxes would need to be changed accordingly (maybe automatically).
+* Add new features:
+  * Add more giant mushrooms
+  * Add more content from the mushrooms mod
+  * Add a lava suit

depends.txt

@@ -1,3 +0,0 @@
-default
-vector_extras
-fence_registration?

functions.lua

@@ -17,3 +17,21 @@ else
 	function riesenpilz.inform()
 	end
 end
+
+local circle_tables = {}
+function riesenpilz.circle(r)
+	local circle = circle_tables[r]
+	if circle then
+		return circle
+	end
+	circle = {}
+	for i = -r, r do
+		for j = -r, r do
+			if math.floor(math.sqrt(i * i + j * j) + 0.5) == r then
+				circle[#circle+1] = {x=i, y=0, z=j}
+			end
+		end
+	end
+	circle_tables[r] = circle
+	return circle
+end

init.lua

@@ -17,22 +17,67 @@ local function r_area(manip, width, height, pos)
 	return VoxelArea:new({MinEdge=emerged_pos1, MaxEdge=emerged_pos2})
 end
 
-local function set_vm_data(manip, nodes, pos, t1, name)
-	manip:set_data(nodes)
-	manip:write_to_map()
-	riesenpilz.inform("a giant "..name.." mushroom grew at "..vector.pos_to_string(pos), 3, t1)
-	local t1 = os.clock()
-	manip:update_map()
-	riesenpilz.inform("map updated", 3, t1)
-end
-
-
 -- contents become added later
 local c
 
+-- cache buildable_to ids
+local re_al_cache = {[minetest.get_content_id("ignore")] = true}
+local function replacing_allowed(id)
+	if re_al_cache[id] ~= nil then
+		return re_al_cache[id]
+	end
+	local def = minetest.registered_nodes[minetest.get_name_from_content_id(id)]
+	if not def
+	or def.buildable_to then
+		re_al_cache[id] = true
+		return true
+	end
+	re_al_cache[id] = false
+	return false
+end
+
+local set_vm_nodes
+if riesenpilz.giant_restrict_area then
+	function set_vm_nodes(manip, pznodes)
+		local nodes = manip:get_data()
+		for vi,id in pairs(pznodes) do
+			if not replacing_allowed(nodes[vi]) then
+				return false
+			end
+			nodes[vi] = id
+		end
+		manip:set_data(nodes)
+		return true
+	end
+else
+	function set_vm_nodes(manip, pznodes)
+		local nodes = manip:get_data()
+		for vi,id in pairs(pznodes) do
+			if replacing_allowed(nodes[vi]) then
+				nodes[vi] = id
+			end
+		end
+		manip:set_data(nodes)
+		return true
+	end
+end
+
+local function set_vm_data(manip, pznodes, pos, t1, name)
+	if not set_vm_nodes(manip, pznodes) then
+		return
+	end
+	manip:write_to_map()
+	riesenpilz.inform("a giant " .. name .. " mushroom grew at " ..
+		minetest.pos_to_string(pos), 3, t1)
+	local t2 = os.clock()
+	manip:update_map()
+	riesenpilz.inform("map updated", 3, t2)
+end
+
+
 function riesenpilz.red(pos, nodes, area, w)
-	local w = w or math.random(MAX_SIZE)
-	local h = w+2
+	w = w or math.random(MAX_SIZE)
+	local h = w + 2
 
 	for i = 0, h do
 		nodes[area:index(pos.x, pos.y+i, pos.z)] = c.stem
@@ -61,17 +106,17 @@ local function riesenpilz_hybridpilz(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, w+1, w+3, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.red(pos, nodes, area, w)
+	local pznodes = {}
+	riesenpilz.red(pos, pznodes, area, w)
 
-	set_vm_data(manip, nodes, pos, t1, "red")
+	set_vm_data(manip, pznodes, pos, t1, "red")
 end
 
 
 function riesenpilz.brown(pos, nodes, area, br)
-	local br = br or math.random(MAX_SIZE-1)+1
-	local h = br+2
+	br = br or math.random(MAX_SIZE-1)+1
+	local h = br + 2
 
 	for i in area:iterp(pos, {x=pos.x, y=pos.y+h, z=pos.z}) do
 		nodes[i] = c.stem
@@ -96,11 +141,11 @@ local function riesenpilz_brauner_minecraftpilz(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, br+1, br+3, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.brown(pos, nodes, area, br)
+	local pznodes = {}
+	riesenpilz.brown(pos, pznodes, area, br)
 
-	set_vm_data(manip, nodes, pos, t1, "brown")
+	set_vm_data(manip, pznodes, pos, t1, "brown")
 end
 
 
@@ -136,16 +181,19 @@ local function riesenpilz_minecraft_fliegenpilz(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 2, 4, pos)
-	local nodes = manip:get_data()
 	local param2s = manip:get_param2_data()
 
-	riesenpilz.fly_agaric(pos, nodes, area, param2s)
+	local pznodes = {}
+	riesenpilz.fly_agaric(pos, pznodes, area, param2s)
 
-	manip:set_data(nodes)
+	if not set_vm_nodes(manip, pznodes) then
+		return
+	end
 	manip:set_param2_data(param2s)
 	manip:write_to_map()
 	manip:update_map()
-	riesenpilz.inform("a fly agaric grew at "..vector.pos_to_string(pos), 3, t1)
+	riesenpilz.inform("a fly agaric grew at " .. minetest.pos_to_string(pos),
+		3, t1)
 end
 
 
@@ -157,7 +205,7 @@ local function ran_node(a, b, ran)
 end
 
 function riesenpilz.lavashroom(pos, nodes, area, h)
-	local h = h or 3+math.random(MAX_SIZE-2)
+	h = h or 3 + math.random(MAX_SIZE - 2)
 
 	-- remove the mushroom
 	nodes[area:indexp(pos)] = c.air
@@ -217,16 +265,16 @@ local function riesenpilz_lavashroom(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 4, h+6, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.lavashroom(pos, nodes, area, h)
+	local pznodes = {}
+	riesenpilz.lavashroom(pos, pznodes, area, h)
 
-	set_vm_data(manip, nodes, pos, t1, "lavashroom")
+	set_vm_data(manip, pznodes, pos, t1, "lavashroom")
 end
 
 
 function riesenpilz.glowshroom(pos, nodes, area, h)
-	local h = h or 2+math.random(MAX_SIZE)
+	h = h or 2 + math.random(MAX_SIZE)
 
 	for i = 0, h do
 		nodes[area:index(pos.x, pos.y+i, pos.z)] = c.stem_blue
@@ -266,29 +314,29 @@ local function riesenpilz_glowshroom(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 2, h+3, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.glowshroom(pos, nodes, area, h)
+	local pznodes = {}
+	riesenpilz.glowshroom(pos, pznodes, area, h)
 
-	set_vm_data(manip, nodes, pos, t1, "glowshroom")
+	set_vm_data(manip, pznodes, pos, t1, "glowshroom")
 end
 
 
 function riesenpilz.parasol(pos, nodes, area, w, h)
-	local h = h or 6+math.random(MAX_SIZE)
+	h = h or 6 + math.random(MAX_SIZE)
 
 	--stem
 	for i in area:iterp(pos, {x=pos.x, y=pos.y+h-2, z=pos.z}) do
 		nodes[i] = c.stem
 	end
 
-	local w = w or MAX_SIZE+math.random(2)
+	w = w or MAX_SIZE + math.random(2)
 	local bhead1 = w-1
 	local bhead2 = math.random(1,w-2)
 
 	for _,j in pairs({
 		{bhead2, 0, c.head_brown_bright},
-		{bhead1, -1, c.head_binge}
+		{bhead1, -1, c.head_beige}
 	}) do
 		for i in area:iter(pos.x-j[1], pos.y+h+j[2], pos.z-j[1], pos.x+j[1], pos.y+h+j[2], pos.z+j[1]) do
 			nodes[i] = j[3]
@@ -302,8 +350,8 @@ function riesenpilz.parasol(pos, nodes, area, w, h)
 			nodes[area:index(pos.x+l*k, pos.y+rh, pos.z+k)] = c.head_white
 		end
 		for l = -w+1, w do
-			nodes[area:index(pos.x+w*k, pos.y+h-2, pos.z-l*k)] = c.head_binge
-			nodes[area:index(pos.x+l*k, pos.y+h-2, pos.z+w*k)] = c.head_binge
+			nodes[area:index(pos.x+w*k, pos.y+h-2, pos.z-l*k)] = c.head_beige
+			nodes[area:index(pos.x+l*k, pos.y+h-2, pos.z+w*k)] = c.head_beige
 		end
 		for l = -bhead1+1, bhead1 do
 			nodes[area:index(pos.x+bhead1*k, pos.y+h-2, pos.z-l*k)] = c.head_white
@@ -320,11 +368,11 @@ local function riesenpilz_parasol(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, w, h, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.parasol(pos, nodes, area, w, h)
+	local pznodes = {}
+	riesenpilz.parasol(pos, pznodes, area, w, h)
 
-	set_vm_data(manip, nodes, pos, t1, "parasol")
+	set_vm_data(manip, pznodes, pos, t1, "parasol")
 end
 
 
@@ -370,13 +418,15 @@ function riesenpilz.red45(pos, nodes, area, h1, h2)
 					or math.random(4) ~= 2 then
 						nodes[area:index(pos.x+x*j, pos.y+h, pos.z+z*i)] = c.head_red
 					end
-					local z = z+1
-					x = x+1
-					nodes[area:index(pos.x+x*j, pos.y+walkspace+2, pos.z+z*i)] = c.head_red
-					if z ~= 3
-					or x ~= 3
+					local zo = z+1
+					local xo = x+1
+					nodes[area:index(pos.x + xo * j, pos.y + walkspace + 2,
+						pos.z + zo * i)] = c.head_red
+					if zo ~= 3
+					or xo ~= 3
 					or math.random(2) == 1 then
-						nodes[area:index(pos.x+x*j, pos.y+walkspace+3, pos.z+z*i)] = c.head_red
+						nodes[area:index(pos.x + xo * j, pos.y + walkspace + 3,
+							pos.z + zo * i)] = c.head_red
 					end
 				end
 			end
@@ -400,11 +450,11 @@ local function riesenpilz_red45(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 3, h, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.red45(pos, nodes, area, h1, h2)
+	local pznodes = {}
+	riesenpilz.red45(pos, pznodes, area, h1, h2)
 
-	set_vm_data(manip, nodes, pos, t1, "red45")
+	set_vm_data(manip, pznodes, pos, t1, "red45")
 end
 
 
@@ -430,16 +480,16 @@ function riesenpilz.apple(pos, nodes, area)
 		nodes[area:index(pos.x, pos.y+i, pos.z)] = c.tree
 	end
 
-	local c = pos.y+1
+	local d = pos.y+1
 	for i = -3,1,1 do
-		nodes[area:index(pos.x+i, c, pos.z+1)] = c.brown
+		nodes[area:index(pos.x+i, d, pos.z+1)] = c.brown
 	end
 	for i = 0,1,1 do
-		nodes[area:index(pos.x+i+1, c, pos.z-1-i)] = c.brown
-		nodes[area:index(pos.x+i+2, c, pos.z-1-i)] = c.brown
+		nodes[area:index(pos.x+i+1, d, pos.z-1-i)] = c.brown
+		nodes[area:index(pos.x+i+2, d, pos.z-1-i)] = c.brown
 	end
-	nodes[area:index(pos.x+1, c, pos.z)] = c.brown
-	nodes[area:index(pos.x-3, c+1, pos.z+1)] = c.brown
+	nodes[area:index(pos.x+1, d, pos.z)] = c.brown
+	nodes[area:index(pos.x-3, d+1, pos.z+1)] = c.brown
 end
 
 local function riesenpilz_apple(pos)
@@ -447,13 +497,15 @@ local function riesenpilz_apple(pos)
 	local t1 = os.clock()
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 5, 14, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.apple(pos, nodes, area)
+	local pznodes = {}
+	riesenpilz.apple(pos, pznodes, area)
 
-	manip:set_data(nodes)
+	if not set_vm_nodes(manip, pznodes) then
+		return
+	end
 	manip:write_to_map()
-	riesenpilz.inform("an apple grew at "..vector.pos_to_string(pos), 3, t1)
+	riesenpilz.inform("an apple grew at " .. minetest.pos_to_string(pos), 3, t1)
 	manip:update_map()
 end
 
@@ -490,7 +542,7 @@ end
 local abm_allowed = true
 local disallowed_ps = {}
 
-for name,i in pairs({
+for name, ndata in pairs({
 	brown = {
 		description = "brown mushroom",
 		box = {
@@ -506,6 +558,7 @@ for name,i in pairs({
 			interval = 100,
 			chance = 18,
 		},
+		hp = 2,
 	},
 	red = {
 		description = "red mushroom",
@@ -524,6 +577,7 @@ for name,i in pairs({
 			interval = 50,
 			chance = 30,
 		},
+		hp = -2,
 	},
 	fly_agaric = {
 		description = "fly agaric",
@@ -540,6 +594,7 @@ for name,i in pairs({
 			interval = 101,
 			chance = 30,
 		},
+		hp = -6,
 	},
 	lavashroom = {
 		description = "Lavashroom",
@@ -557,6 +612,7 @@ for name,i in pairs({
 			interval = 1010,
 			chance = 60,
 		},
+		hp = -1,
 	},
 	glowshroom = {
 		description = "Glowshroom",
@@ -577,6 +633,7 @@ for name,i in pairs({
 			interval = 710,
 			chance = 320,
 		},
+		hp = -2,
 	},
 	nether_shroom = {
 		description = "Nether mushroom",
@@ -590,6 +647,7 @@ for name,i in pairs({
 			{ 2/16, -1/16, -2/16, 4/16,  1/16, 2/16}
 		},
 		burntime = 6,
+		hp = -3,
 	},
 	parasol = {
 		description = "white parasol mushroom",
@@ -608,6 +666,7 @@ for name,i in pairs({
 			interval = 51,
 			chance = 36,
 		},
+		hp = 3,
 	},
 	red45 = {
 		description = "45 red mushroom",
@@ -627,6 +686,7 @@ for name,i in pairs({
 			interval = 1000,
 			chance = 180,
 		},
+		hp = 1,
 	},
 	brown45 = {
 		description = "45 brown mushroom",
@@ -645,17 +705,26 @@ for name,i in pairs({
 			interval = 100,
 			chance = 20,
 		},
+		hp = 1,
 	},
 }) do
-	local burntime = i.burntime or 1
+	local burntime = ndata.burntime or 1
 	local box = {
 		type = "fixed",
-		fixed = i.box
+		fixed = ndata.box
 	}
-	local nd = "riesenpilz:"..name
+	local nd = "riesenpilz:" .. name
 	minetest.register_node(nd, {
-		description = i.description,
-		tiles = {"riesenpilz_"..name.."_top.png", "riesenpilz_"..name.."_bottom.png", "riesenpilz_"..name.."_side.png"},
+		description = ndata.description,
+		tiles = {
+			--~ {name = "riesenpilz_"..name.."_top.png", tileable_vertical = false},
+			--~ {name = "riesenpilz_"..name.."_bottom.png", tileable_vertical = false},
+			--~ {name = "riesenpilz_"..name.."_side.png", tileable_vertical = false},
+			"riesenpilz_" .. name .. "_top.png",
+			"riesenpilz_" .. name .. "_bottom.png",
+			"riesenpilz_" .. name .. "_side.png",
+		},
+		use_texture_alpha = "opaque",
 		inventory_image = "riesenpilz_"..name.."_side.png",
 		walkable = false,
 		buildable_to = true,
@@ -665,10 +734,11 @@ for name,i in pairs({
 		sounds =  default.node_sound_leaves_defaults(),
 		node_box = box,
 		selection_box = box,
-		furnace_burntime = burntime
+		furnace_burntime = burntime,
+		on_secondary_use = minetest.item_eat(ndata.hp),
 	})
 
-	local g = i.growing
+	local g = ndata.growing
 
 	if g then
 		local grounds = g.grounds
@@ -705,6 +775,7 @@ for name,i in pairs({
 			neighbors = g.neighbours,
 			interval = g.interval,
 			chance = g.chance,
+			catch_up = false,
 			action = function(pos, node)
 				if not abm_allowed then
 					return
@@ -729,8 +800,8 @@ for name,i in pairs({
 					return
 				end
 				local groups = data.groups
-				for n,i in pairs(grounds) do
-					if groups[n] ~= i then
+				for groupname, groupvalue in pairs(grounds) do
+					if groups[groupname] ~= groupvalue then
 						return
 					end
 				end
@@ -745,36 +816,36 @@ for name,i in pairs({
 			-- should disallow lag
 				abm_allowed = false
 				minetest.after(2, function() abm_allowed = true end)
-				table.insert(disallowed_ps, pos)
+				disallowed_ps[#disallowed_ps+1] = pos
 
 			-- witch circles
 				local ps = {}
-				for _,p in pairs(vector.circle(math.random(rmin, rmax))) do
-					local p = vector.add(pos, p)
+				for _,p in pairs(riesenpilz.circle(math.random(rmin, rmax))) do
+					p = vector.add(pos, p)
 
 				-- currently 3 is used here, approved by its use in the mapgen
 					if math.random(3) == 1 then
 
 					-- don't only use the current y for them
 						for y = 1,-1,-1 do
-							local pos = {x=p.x, y=p.y+y, z=p.z}
-							if minetest.get_node(pos).name ~= "air" then
+							local pos_above = {x=p.x, y=p.y+y, z=p.z}
+							if minetest.get_node(pos_above).name ~= "air" then
 								break
 							end
 							local f = minetest.get_node({x=p.x, y=p.y+y-1, z=p.z}).name
 							if f ~= "air" then
 
 							-- they grown on specific nodes
-								local data = minetest.registered_nodes[f]
-								if data
-								and data.walkable
-								and data.groups
-								and (not data.drawtype
-									or data.drawtype == "normal"
+								local data_ground = minetest.registered_nodes[f]
+								if data_ground
+								and data_ground.walkable
+								and data_ground.groups
+								and (not data_ground.drawtype
+									or data_ground.drawtype == "normal"
 								) then
 									local ground_disallowed
 									for n,i in pairs(grounds) do
-										if data.groups[n] ~= i then
+										if data_ground.groups[n] ~= i then
 											ground_disallowed = true
 											break
 										end
@@ -782,10 +853,11 @@ for name,i in pairs({
 									if not ground_disallowed then
 
 									-- they also need specific light strengths
-										local light = minetest.get_node_light(pos, 0.5)
+										local light = minetest.get_node_light(
+											pos_above, 0.5)
 										if light >= lmin
 										and light <= lmax then
-											table.insert(ps, pos)
+											ps[#ps+1] = pos_above
 										end
 									end
 								end
@@ -832,7 +904,7 @@ local head_sounds = default.node_sound_wood_defaults({
 local add_fence = minetest.register_fence
 local node_groups = {oddly_breakable_by_hand=3, fall_damage_add_percent=-80, bouncy=10}
 
-for _,i in pairs({
+for _, ndata in ipairs({
 	{
 		typ = "stem",
 		description = "white",
@@ -914,8 +986,8 @@ for _,i in pairs({
 	},
 	{
 		typ = "head",
-		name = "binge",
-		textures = {"head_binge.png", "head_white.png", "head_binge.png"},
+		name = "beige",
+		textures = {"head_beige.png", "head_white.png", "head_beige.png"},
 		sapling = "parasol"
 	},
 	{
@@ -927,8 +999,8 @@ for _,i in pairs({
 	},
 }) do
 	-- fill missing stuff
-	local textures = i.textures
-	i.description = i.description or i.name
+	local textures = ndata.textures
+	ndata.description = ndata.description or ndata.name
 	if type(textures) == "string" then
 		textures = {textures}
 	end
@@ -937,25 +1009,26 @@ for _,i in pairs({
 	end
 	local nodename = "riesenpilz:"
 	local desctiption,sounds = "giant mushroom "
-	if i.typ == "stem" then
-		desctiption = desctiption.."stem "..i.description
-		nodename = nodename.."stem"..((i.name and "_"..i.name) or "")
+	if ndata.typ == "stem" then
+		desctiption = desctiption .. "stem " .. ndata.description
+		nodename = nodename .. "stem" ..
+			((ndata.name and "_" .. ndata.name) or "")
 		sounds = default.node_sound_wood_defaults({
 			footstep = {name="riesenpilz_stem", gain=0.2},
 			place = {name="default_place_node", gain=0.5},
 			dig = {name="riesenpilz_stem", gain=0.4},
 			dug = {name="default_wood_footstep", gain=0.3}
 		})
-	elseif i.typ == "head" then
-		desctiption = desctiption.."head "..i.description
-		nodename = nodename.."head_"..i.name
+	elseif ndata.typ == "head" then
+		desctiption = desctiption .. "head " .. ndata.description
+		nodename = nodename .. "head_" .. ndata.name
 		sounds = head_sounds
 	else
-		nodename = nodename..i.name
-		desctiption = desctiption..i.description
+		nodename = nodename .. ndata.name
+		desctiption = desctiption .. ndata.description
 	end
-	local drop = i.sapling and {max_items = 1, items = {
-		{items = {"riesenpilz:"..i.sapling}, rarity = 20},
+	local drop = ndata.sapling and {max_items = 1, items = {
+		{items = {"riesenpilz:" .. ndata.sapling}, rarity = 20},
 		{items = {nodename}, rarity = 1}
 	}}
 	minetest.register_node(nodename, {
@@ -967,7 +1040,7 @@ for _,i in pairs({
 	})
 
 	if add_fence
-	and i.fence ~= false then
+	and ndata.fence ~= false then
 		add_fence({fence_of = nodename})
 	end
 end
@@ -1018,7 +1091,7 @@ c = {
 	head_blue_bright = minetest.get_content_id("riesenpilz:head_blue_bright"),
 
 	head_white = minetest.get_content_id("riesenpilz:head_white"),
-	head_binge = minetest.get_content_id("riesenpilz:head_binge"),
+	head_beige = minetest.get_content_id("riesenpilz:head_beige"),
 	head_brown_bright = minetest.get_content_id("riesenpilz:head_brown_bright"),
 
 	stem_red = minetest.get_content_id("riesenpilz:stem_red"),
@@ -1038,37 +1111,88 @@ minetest.register_tool("riesenpilz:growingtool", {
 	inventory_image = "riesenpilz_growingtool.png",
 })
 
+local grow_functions = {
+	["riesenpilz:red"] = riesenpilz_hybridpilz,
+	["riesenpilz:fly_agaric"] = riesenpilz_minecraft_fliegenpilz,
+	["riesenpilz:brown"] = riesenpilz_brauner_minecraftpilz,
+	["riesenpilz:lavashroom"] = riesenpilz_lavashroom,
+	["riesenpilz:glowshroom"] = riesenpilz_glowshroom,
+	["riesenpilz:parasol"] = riesenpilz_parasol,
+	["riesenpilz:red45"] = riesenpilz_red45,
+	["default:apple"] = riesenpilz_apple
+}
+local function get_grow(name)
+	if grow_functions[name] then
+		return grow_functions[name]
+	end
+
+	local is = {}
+	for i = 1,#minetest.registered_abms do
+		local ad = minetest.registered_abms[i]
+		if type(ad.nodenames) ~= "table" then
+			minetest.log("warning", "ABM nodenames is not a table: " ..
+				dump(ad))
+			return
+		end
+		if ad.chance > 1
+		and table.indexof(ad.nodenames, name) ~= -1 then
+			is[#is+1] = ad.action
+		end
+	end
+
+	local func
+	if is[1] then
+		function func(pos, node)
+			for i = 1,#is do
+				is[i](pos, node)
+			end
+		end
+	else
+		local def = minetest.registered_nodes[name]
+		if def then
+			if def.on_timer then
+				func = def.on_timer
+			else
+				func = function(pos, _, player)
+					if def.on_place then
+						def.on_place(ItemStack(name), player, {
+							type = "node",
+							under = vector.new(pos),--{x=pos.x, y=pos.y-1, z=pos.z},
+							above = vector.new(pos)
+						})
+					end
+					if def.after_place_node then
+						def.after_place_node(pos)
+					end
+				end
+			end
+		else
+			func = function() end
+		end
+	end
+
+	grow_functions[name] = func
+	return func
+end
+
 minetest.register_on_punchnode(function(pos, node, player)
 	if player:get_wielded_item():get_name() ~= "riesenpilz:growingtool"
 	or minetest.is_protected(pos, player:get_player_name()) then
 		return
 	end
 
-	local name = node.name
-	if name == "riesenpilz:red" then
-		riesenpilz_hybridpilz(pos)
-	elseif name == "riesenpilz:fly_agaric" then
-		riesenpilz_minecraft_fliegenpilz(pos)
-	elseif name == "riesenpilz:brown" then
-		riesenpilz_brauner_minecraftpilz(pos)
-	elseif name == "riesenpilz:lavashroom" then
-		riesenpilz_lavashroom(pos)
-	elseif name == "riesenpilz:glowshroom" then
-		riesenpilz_glowshroom(pos)
-	elseif name == "riesenpilz:parasol" then
-		riesenpilz_parasol(pos)
-	elseif name == "riesenpilz:red45" then
-		riesenpilz_red45(pos)
-	elseif name == "default:apple" then
-		riesenpilz_apple(pos)
+	local func = get_grow(node.name)
+	if func then
+		func(pos, node, player)
 	end
 end)
 
 
 
--- Food
+-- Uses
 
 
+-- mush45's meal
 minetest.register_craftitem("riesenpilz:mush45_meal", {
 	description = "Mushroom Meal",
 	inventory_image = "riesenpilz_mush45_meal.png",
@@ -1084,11 +1208,67 @@ minetest.register_craft({
 })
 
 
+--[[ unfinished
+if minetest.global_exists(technic) then
+	if minetest.global_exists(digilines) then
+		-- digiline light value detector
+		minetest.register_node("riesenpilz:light_detector" {
+			tiles = {"riesenpilz_light_detector.png"},
+			paramtype = "light",
+			digiline = {
+				receive = function(pos)
+					local light = minetest.get_node_light(pos)
+					send("light_detector", light)
+				end,
+			},
+			--sounds = ,
+		})
+
+		--technic.comp({"riesenpilz:glowshroom 10", "coal"}, "riesenpilz:light_detector")
+	end
+
+
+	--[ [
+	if minetest.global_exists(3darmor) then add to depends
+		--lavashroom skin armor, swimming in lava possible
+
+		minetest.register_craftitem("riesenpilz:lavashroom_flesh", {
+			description = "lavashroom's flesh",
+			inventory_image = "riesenpilz_lavashroom_flesh.png",
+			on_use = minetest.item_eat(3),
+		})
+
+		minetest.register_craftitem("riesenpilz:lavashroom_skin", {
+			description = "lavashroom's skin",
+			inventory_image = "riesenpilz_lavashroom_skin.png",
+		})
+
+		minetest.register_craftitem("riesenpilz:antilava_plate", {
+			description = "lava protecting plate",
+			inventory_image = "riesenpilz_antilava_plate.png",
+		})
+
+		technic.centri("riesenpilz:lavashroom", {"riesenpilz:lavashroom_flesh", "riesenpilz:lavashroom_skin"})
+		technic.comp("riesenpilz:lavashroom_skin 5", "riesenpilz:antilava_plate")
+
+		armor_register(plate blah)
+	end--] ]
+})
+end--]]
+
 
 if riesenpilz.enable_mapgen then
 	dofile(modpath.."mapgen.lua")
 end
 
+
+
+-- Legacy
+
+
+minetest.register_alias("riesenpilz:head_binge", "riesenpilz:head_beige")
+
+
 local time = math.floor(tonumber(os.clock()-load_time_start)*100+0.5)/100
 local msg = "[riesenpilz] loaded after ca. "..time
 if time > 0.05 then

mapgen.lua

@@ -6,6 +6,7 @@ local function define_contents()
 		ignore = minetest.get_content_id("ignore"),
 		air = minetest.get_content_id("air"),
 
+		water = minetest.get_content_id("default:water_source"),
 		stone = minetest.get_content_id("default:stone"),
 		dirt = minetest.get_content_id("default:dirt"),
 		desert_sand = minetest.get_content_id("default:desert_sand"),
@@ -20,7 +21,6 @@ local function define_contents()
 		riesenpilz_glowshroom = minetest.get_content_id("riesenpilz:glowshroom"),
 		riesenpilz_parasol = minetest.get_content_id("riesenpilz:parasol"),
 
-		GROUND = {},
 		TREE_STUFF = {
 			minetest.get_content_id("default:tree"),
 			minetest.get_content_id("default:leaves"),
@@ -29,74 +29,75 @@ local function define_contents()
 			minetest.get_content_id("default:jungleleaves"),
 			minetest.get_content_id("default:junglegrass"),
 		},
-		USUAL_STUFF = {
-			minetest.get_content_id("default:cactus"),
-			minetest.get_content_id("default:papyrus"),
-		},
 	}
-	for name,data in pairs(minetest.registered_nodes) do
-		local groups = data.groups
-		if groups then
-			if groups.crumbly == 3
-			or groups.soil == 1 then
-				table.insert(c.GROUND, minetest.get_content_id(name))
-			end
-		end
-	end
 end
 
 
-local function find_ground(a,list)
-	for i = 1,#list do
-		if a == list[i] then
+local grounds = {}
+local function is_ground(id)
+	local is = grounds[id]
+	if is ~= nil then
+		return is
+	end
+	local data = minetest.registered_nodes[minetest.get_name_from_content_id(id)]
+	if not data
+	or data.paramtype == "light" then
+		grounds[id] = false
+		return false
+	end
+	local groups = data.groups
+	if groups
+	and (groups.crumbly == 3 or groups.soil == 1) then
+		grounds[id] = true
 		return true
 	end
+	grounds[id] = false
+	return false
+end
+
+local toremoves = {}
+local function is_toremove(id)
+	local is = toremoves[id]
+	if is ~= nil then
+		return is
 	end
+	local data = minetest.registered_nodes[minetest.get_name_from_content_id(id)]
+	if not data then
+		toremoves[id] = false
+		return false
+	end
+	local groups = data.groups
+	if groups
+	and groups.flammable then
+		toremoves[id] = true
+		return true
+	end
+	toremoves[id] = false
 	return false
 end
 
 
-local data, area
-function riesenpilz_circle(nam, pos, radius, chance)
-	for _,p in pairs(vector.circle(radius)) do
-		if pr:next(1,chance) == 1 then
-			local p = vector.add(pos, p)
-			local p_p = area:indexp(p)
-			if (data[p_p] == c.air or data[p_p] == c.ignore)
-			and find_ground(data[area:index(p.x, p.y-1, p.z)], c.GROUND) then
-				data[p_p] = nam
+local data = {}
+local area, pr
+local function make_circle(nam, pos, radius, chance)
+	local circle = riesenpilz.circle(radius)
+	for i = 1, #circle do
+		if pr:next(1, chance) == 1 then
+			local vi = area:indexp(vector.add(pos, circle[i]))
+			if data[vi] == c.air
+			and is_ground(data[vi - area.ystride]) then
+				data[vi] = nam
 			end
 		end
 	end
 end
 
-local function say_info(info)
-	local info = "[riesenpilz] "..info
-	print(info)
-	minetest.chat_send_all(info)
-end
 
--- perlin noise "hills" are not peaks but looking like sinus curve
-local function upper_rarity(rarity)
-	return math.sign(rarity)*math.sin(math.abs(rarity)*math.pi/2)
-end
-
-local rarity = riesenpilz.mapgen_rarity
-local riesenpilz_size = riesenpilz.mapgen_size
-
-local nosmooth_rarity = 1-rarity/50
-local perlin_scale = riesenpilz_size*100/rarity
-local smooth_rarity_max, smooth_rarity_min, smooth_rarity_dif
-local smooth = riesenpilz.smooth
-if smooth then
-	local smooth_trans_size = riesenpilz.smooth_trans_size
-	smooth_rarity_max = upper_rarity(nosmooth_rarity+smooth_trans_size*2/perlin_scale)
-	smooth_rarity_min = upper_rarity(nosmooth_rarity-smooth_trans_size/perlin_scale)
-	smooth_rarity_dif = smooth_rarity_max-smooth_rarity_min
-end
-nosmooth_rarity = upper_rarity(nosmooth_rarity)
-
---local USUAL_STUFF =	{"default:leaves","default:apple","default:tree","default:cactus","default:papyrus"}
+local nosmooth_rarity = 0.5
+local smooth_rarity_max = 0.6
+local smooth_rarity_min = 0.4
+local smooth_rarity_dif = smooth_rarity_max - smooth_rarity_min
+local perlin_scale = 500
 
 local contents_defined
 minetest.register_on_generated(function(minp, maxp, seed)
@@ -127,7 +128,9 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	end
 
 	local t1 = os.clock()
-	riesenpilz.inform("tries to generate a giant mushroom biome at: x=["..minp.x.."; "..maxp.x.."]; y=["..minp.y.."; "..maxp.y.."]; z=["..minp.z.."; "..maxp.z.."]", 2)
+	riesenpilz.inform(("tries to generate a giant mushroom biome at: " ..
+		"x=[%d; %d]; y=[%d; %d]; z=[%d; %d]"):format(minp.x, maxp.x, minp.y,
+		maxp.y, minp.z, maxp.z), 2)
 
 	if not contents_defined then
 		define_contents()
@@ -141,9 +144,10 @@ minetest.register_on_generated(function(minp, maxp, seed)
 
 	local heightmap = minetest.get_mapgen_object("heightmap")
 	local hmi = 1
+	local hm_zstride = divs+1
 
 	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
-	data = vm:get_data()
+	vm:get_data(data)
 	area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
 
 	for p_pos in area:iterp(minp, maxp) do	--remove tree stuff
@@ -166,7 +170,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 			--smooth mapgen
 			if riesenpilz.always_generate then
 				in_biome = true
-			elseif smooth then
+			elseif riesenpilz.smooth then
 				if test >= smooth_rarity_max
 				or (
 					test > smooth_rarity_min
@@ -180,59 +184,62 @@ minetest.register_on_generated(function(minp, maxp, seed)
 
 			if in_biome then
 
-				local ymin = math.max(heightmap[hmi]-5, minp.y) -- -1
+				local ymin = math.max(heightmap[hmi]-5, minp.y)
+				local ymax = math.min(heightmap[hmi]+20, maxp.y)
 
 				-- skip the air part
 				local ground
-				for y = math.min(heightmap[hmi]+20, maxp.y),ymin,-1 do
-					if data[area:index(x, y, z)] ~= c.air then
+				local vi = area:index(x, ymax, z)
+				for y = ymax, ymin, -1 do
+					if data[vi] ~= c.air then
 						ground = y
 						break
 					end
+					vi = vi - area.ystride
 				end
 
 				local ground_y
 				if ground then
-					for y = ground,ymin,-1 do
-						local p_pos = area:index(x, y, z)
-						local d_p_pos = data[p_pos]
-						for _,nam in pairs(c.USUAL_STUFF) do --remove usual stuff
-							if d_p_pos == nam then
-								data[p_pos] = c.air
-								p_pos = nil
-								break
-							end
-						end
-						if p_pos --else search ground_y
-						and find_ground(d_p_pos, c.GROUND) then
+					for y = ground, ymin, -1 do
+						local d_p_pos = data[vi]
+						if is_toremove(d_p_pos) then
+							-- remove trees etc.
+							data[vi] = c.air
+						else
+							if is_ground(d_p_pos) then
 								ground_y = y
+								heightmap[hmi] = y
+							end
 							break
 						end
+						vi = vi - area.ystride
 					end
 				end
 
 				if ground_y then
-					data[area:index(x, ground_y, z)] = c.ground
-					for i = -1,-5,-1 do
-						local p_pos = area:index(x, ground_y+i, z)
-						if data[p_pos] == c.desert_sand then
-							data[p_pos] = c.dirt
-						else
+					-- add ground and dirt below if needed
+					data[vi] = c.ground
+					for off = -1,-5,-1 do
+						local p_pos = vi + off * area.ystride
+						if not is_ground(data[p_pos])
+						or data[p_pos] == c.dirt then
 							break
 						end
+						data[p_pos] = c.dirt
 					end
+
 					local bigtype
 					local boden = {x=x,y=ground_y+1,z=z}
 					if pr:next(1,15) == 1 then
-						data[area:index(x, ground_y+1, z)] = c.dry_shrub
+						data[vi + area.ystride] = c.dry_shrub
 					elseif pr:next(1,80) == 1 then
-						riesenpilz_circle(c.riesenpilz_brown, boden, pr:next(3,4), 3)
+						make_circle(c.riesenpilz_brown, boden, pr:next(3,4), 3)
 					elseif pr:next(1,85) == 1 then
-						riesenpilz_circle(c.riesenpilz_parasol, boden, pr:next(3,5), 3)
+						make_circle(c.riesenpilz_parasol, boden, pr:next(3,5), 3)
 					elseif pr:next(1,90) == 1 then
-						riesenpilz_circle(c.riesenpilz_red, boden, pr:next(4,5), 3)
+						make_circle(c.riesenpilz_red, boden, pr:next(4,5), 3)
 					elseif pr:next(1,100) == 1 then
-						riesenpilz_circle(c.riesenpilz_fly_agaric, boden, 4, 3)
+						make_circle(c.riesenpilz_fly_agaric, boden, 4, 3)
 					elseif pr:next(1,340) == 10 then
 						bigtype = 2
 					elseif pr:next(1,380) == 1 then
@@ -242,9 +249,9 @@ minetest.register_on_generated(function(minp, maxp, seed)
 					elseif pr:next(1,800) == 7 then
 						bigtype = 5
 					elseif pr:next(1,4000) == 1 then
-						riesenpilz_circle(c.riesenpilz_lavashroom, boden, pr:next(5,6), 3)
+						make_circle(c.riesenpilz_lavashroom, boden, pr:next(5,6), 3)
 					elseif pr:next(1,5000) == 1 then
-						riesenpilz_circle(c.riesenpilz_glowshroom, boden, 3, 3)
+						make_circle(c.riesenpilz_glowshroom, boden, 3, 3)
 					elseif pr:next(1,6000) == 2 then
 						if pr:next(1,200) == 15 then
 							bigtype = 4
@@ -268,6 +275,34 @@ minetest.register_on_generated(function(minp, maxp, seed)
 		local t2 = os.clock()
 		for _,v in pairs(tab) do
 			local p = v[2]
+
+			-- simple test for the distance to the biome border
+			local found_border = false
+			local dist = 5
+			local xmin = math.max(minp.x, p.x - dist)
+			local xmax = math.min(maxp.x, p.x + dist)
+			local hm_vi = (p.z - minp.z) * hm_zstride + xmin - minp.x + 1
+			for _ = xmin, xmax do
+				if not heightmap[hm_vi] then
+					found_border = true
+					break
+				end
+				hm_vi = hm_vi+1
+			end
+			if not found_border then
+				local zmin = math.max(minp.z, p.z - dist)
+				local zmax = math.min(maxp.z, p.z + dist)
+				hm_vi = (zmin - minp.z) * hm_zstride + p.x - minp.x + 1
+				for _ = zmin, zmax do
+					if not heightmap[hm_vi] then
+						found_border = true
+						break
+					end
+					hm_vi = hm_vi + hm_zstride
+				end
+			end
+
+			if not found_border then
 				local m = v[1]
 				if m == 1 then
 					riesenpilz.red(p, data, area)
@@ -286,6 +321,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 					riesenpilz.red45(p, data, area)
 				end
 			end
+		end
 		riesenpilz.inform("giant shrooms generated", 2, t2)
 	end
 
@@ -297,7 +333,6 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	vm:set_lighting({day=0, night=0})
 	vm:calc_lighting()
 	vm:write_to_map()
-	data = nil
 	area = nil
 	riesenpilz.inform("data set", 2, t2)
 

mod.conf

@@ -0,0 +1,3 @@
+name = riesenpilz
+depends = default
+optional_depends = digilines,fence_registration,technic

settings.lua

@@ -1,6 +1,7 @@
 --This file contains configuration options for riesenpilz mod.
 
-riesenpilz.enable_mapgen = true
+-- mapgen size etc. does not work
+riesenpilz.enable_mapgen = false
 
 --Generate giant mushroom biomes everywhere
 riesenpilz.always_generate = false
@@ -8,15 +9,6 @@ riesenpilz.always_generate = false
 --Enables smooth transition of biomes.
 riesenpilz.smooth = true
 
---rarity in %
-riesenpilz.mapgen_rarity = 0.4
-
---size of the generated... (has an effect to the rarity, too)
-riesenpilz.mapgen_size = 200
-
---approximate size of smooth transitions
-riesenpilz.smooth_trans_size = 2
-
 --says some information.
 riesenpilz.info = true
 
@@ -28,3 +20,6 @@ riesenpilz.max_spam = 2
 
 --3d apple
 riesenpilz.change_apple = true
+
+--disallows growing a mushroom if it not every node would have a free place
+riesenpilz.giant_restrict_area = false