Set proper realm boundaries

mods/CORE/mcl_init/init.lua

@@ -12,15 +12,25 @@ mcl_vars.inventory_header = mcl_vars.gui_slots .. mcl_vars.gui_bg
 local mg_name = minetest.get_mapgen_setting("mg_name")
 local minecraft_height_limit = 256
 if mg_name ~= "flat" then
-	mcl_vars.mg_overworld_min = -62
-	mcl_vars.mg_overworld_max = mcl_vars.mg_overworld_min + minecraft_height_limit
+	--[[ Realm stacking (h is for height)
+	- Overworld (h>=256)
+	- Void (h>=1000)
+	- Realm Barrier (h=11), to allow escaping the End
+	- End (h>=256)
+	- Void (h>=1000)
+	- Nether (h=128)
+	- Void (h>=1000)
+	]]
 
-	-- 1 flat bedrock layer with 4 rough layers above
+	-- Overworld
+	mcl_vars.mg_overworld_min = -62
+	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
 	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
 	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min + 4
 	mcl_vars.mg_lava_overworld_max = mcl_vars.mg_overworld_min + 10
 	mcl_vars.mg_lava = true
 	mcl_vars.mg_bedrock_is_rough = true
+
 else
 	local ground = minetest.get_mapgen_setting("mgflat_ground_level")
 	ground = tonumber(ground)
@@ -33,13 +43,28 @@ else
 	else
 		mcl_vars.mg_overworld_min = ground - 3
 	end
-	mcl_vars.mg_overworld_max = mcl_vars.mg_overworld_min + minecraft_height_limit
+	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
 	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
 	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min
 	mcl_vars.mg_lava = false
 	mcl_vars.mg_bedrock_is_rough = false
 end
 
+mcl_vars.mg_overworld_max = math.huge
+
+-- The Nether
+mcl_vars.mg_nether_min = -29000
+mcl_vars.mg_nether_max = mcl_vars.mg_nether_min + 128
+mcl_vars.mg_bedrock_nether_bottom_min = mcl_vars.mg_nether_min
+mcl_vars.mg_bedrock_nether_bottom_max = mcl_vars.mg_bedrock_nether_bottom_min + 4
+mcl_vars.mg_bedrock_nether_top_max = mcl_vars.mg_nether_max
+mcl_vars.mg_bedrock_nether_top_min = mcl_vars.mg_bedrock_nether_top_max - 4
+
+-- The End
+mcl_vars.mg_end_min = mcl_vars.mg_nether_max + 2000
+mcl_vars.mg_end_max_official = mcl_vars.mg_end_min + minecraft_height_limit
+mcl_vars.mg_end_max = mcl_vars.mg_overworld_min - 2000
+
 -- Set default stack sizes
 minetest.nodedef_default.stack_max = 64
 minetest.craftitemdef_default.stack_max = 64

mods/CORE/mcl_util/init.lua

@@ -335,9 +335,23 @@ end
 -- 1st return value: true if pos is in void
 -- 2nd return value: true if it is in the deadly part of the void
 function mcl_util.is_in_void(pos)
-	local void, void_deadly
-	void = pos.y < mcl_vars.mg_overworld_min
-	void_deadly = pos.y < mcl_vars.mg_overworld_min - 64
+	local void =
+		not ((pos.y < mcl_vars.mg_overworld_max and pos.y > mcl_vars.mg_overworld_min) or
+		(pos.y < mcl_vars.mg_nether_max and pos.y > mcl_vars.mg_nether_min) or
+		(pos.y < mcl_vars.mg_end_max and pos.y > mcl_vars.mg_end_min))
+
+	local void_deadly = false
+	local deadly_tolerance = 64 -- the player must be this many nodes “deep” into the void to be damaged
+	if void then
+		-- Overworld → Void → End → Void → Nether → Void
+		if pos.y < mcl_vars.mg_overworld_min and pos.y > mcl_vars.mg_end_max then
+			void_deadly = pos.y < mcl_vars.mg_overworld_min - deadly_tolerance
+		elseif pos.y < mcl_vars.mg_end_min and pos.y > mcl_vars.mg_nether_max then
+			void_deadly = pos.y < mcl_vars.mg_end_min - deadly_tolerance
+		elseif pos.y < mcl_vars.mg_nether_min then
+			void_deadly = pos.y < mcl_vars.mg_nether_min - deadly_tolerance
+		end
+	end
 	return void, void_deadly
 end
 
@@ -351,6 +365,10 @@ end
 function mcl_util.y_to_layer(y)
 	if y >= mcl_vars.mg_overworld_min then
 		return y - mcl_vars.mg_overworld_min, "overworld"
+	elseif y >= mcl_vars.mg_nether_min and y <= mcl_vars.mg_nether_max then
+		return y - mcl_vars.mg_nether_min, "nether"
+	elseif y >= mcl_vars.mg_end_min and y <= mcl_vars.mg_end_max then
+		return y - mcl_vars.mg_end_min, "end"
 	else
 		return nil, "void"
 	end
@@ -359,10 +377,15 @@ end
 -- Takes a Minecraft layer and a “dimension” name
 -- and returns the corresponding Y coordinate for
 -- MineClone 2.
--- minecraft_dimension parameter is ignored at the moment
--- TODO: Implement dimensions
-function mcl_util.layer_to_y(layer, minecraft_dimension)
+-- mc_dimension is one of "overworld", "nether", "end" (default: "overworld").
+function mcl_util.layer_to_y(layer, mc_dimension)
+	if mc_dimension == "overworld" or mc_dimension == nil then
 		return layer + mcl_vars.mg_overworld_min
+	elseif mc_dimension == "nether" then
+		return layer + mcl_vars.mg_nether_min
+	elseif mc_dimension == "end" then
+		return layer + mcl_vars.mg_end_min
+	end
 end
 
 -- Returns a on_place function for plants

mods/MAPGEN/mcl_mapgen_core/init.lua

@@ -1227,33 +1227,49 @@ minetest.register_on_generated(function(minp, maxp)
 					local p_pos = area:index(x, y, z)
 					local setdata = nil
 					if mcl_vars.mg_bedrock_is_rough then
+						local is_bedrock = function(y)
 							-- Bedrock layers with increasing levels of roughness, until a perfecly flat bedrock later at the bottom layer
 							-- This code assumes a bedrock height of 5 layers.
-						if y == BEDROCK_MAX then
+
+							local diff = mcl_vars.mg_bedrock_overworld_max - y -- Overworld bedrock
+							local ndiff1 = mcl_vars.mg_bedrock_nether_bottom_max - y -- Nether bedrock, bottom
+							local ndiff2 = mcl_vars.mg_bedrock_nether_top_max - y -- Nether bedrock, ceiling
+
+							local top
+							if diff == 0 or ndiff1 == 0 or ndiff2 == 4 then
 								-- 50% bedrock chance
-							if math.random(1,2) == 1 then setdata = c_bedrock end
-						elseif y == BEDROCK_MAX -1 then
+								top = 2
+							elseif diff == 1 or ndiff1 == 1 or ndiff2 == 3 then
 								-- 66.666...%
-							if math.random(1,3) <= 2 then setdata = c_bedrock end
-						elseif y == BEDROCK_MAX -2 then
+								top = 3
+							elseif diff == 2 or ndiff1 == 2 or ndiff2 == 2 then
 								-- 75%
-							if math.random(1,4) <= 3 then setdata = c_bedrock end
-						elseif y == BEDROCK_MAX -3 then
+								top = 4
+							elseif diff == 3 or ndiff1 == 3 or ndiff2 == 1 then
 								-- 90%
-							if math.random(1,10) <= 9 then setdata = c_bedrock end
-						elseif y == BEDROCK_MAX -4 then
+								top = 10
+							elseif diff == 4 or ndiff1 == 4 or ndiff2 == 0 then
 								-- 100%
+								return true
+							else
+								-- Not in bedrock layer
+								return false
+							end
+
+							return math.random(1, top) <= top-1
+						end
+						if is_bedrock(y) then
 							setdata = c_bedrock
-						elseif y < BEDROCK_MIN and y > -1000 then
+						elseif mcl_util.is_in_void({x=x,y=y,z=z}) then
 							setdata = c_void
-						elseif y > 1000 and y < 2000 then
-							setdata = c_stone
 						end
 					else
 						-- Perfectly flat bedrock layer(s)
-						if y >= BEDROCK_MIN and y <= BEDROCK_MAX then
+						if (y >= mcl_vars.mg_bedrock_overworld_min and y <= mcl_vars.mg_bedrock_overworld_max) or
+								(y >= mcl_vars.mg_bedrock_nether_bottom_min or y <= mcl_vars.mg_bedrock_bottom_max) or
+								(y >= mcl_vars.mg_bedrock_nether_top_min or y <= mcl_vars.mg_bedrock_top_max) then
 							setdata = c_bedrock
-						elseif y < BEDROCK_MIN and y > -1000 then
+						elseif mcl_util.is_in_void({x=x,y=y,z=z}) then
 							setdata = c_void
 						end
 					end