Overscan to remove anomolous stone.

Breaking the functions into different files may cause problems.

fortress.lua

@@ -0,0 +1,91 @@
+local rand = math.random
+local floor = math.floor
+
+
+fun_caves.fortress = function(minp, maxp, data, area, node)
+	-- invisible maze
+	-- hungry maze
+	-- chests (w traps)
+	-- step traps (math based)
+	-- hidden doors/downs
+	-- hot/ice floors
+	--
+	--local level = ceil(maxp.y / 3100)
+	local n = 16
+	local walls = {}
+	local inner_floor = node['fun_caves:dungeon_floor_1']
+	local outer_wall = node['fun_caves:dungeon_wall_2']
+	local inner_wall = node['fun_caves:dungeon_wall_1']
+
+	for y2 = 0, n-1 do
+		--for y2 = 0, 0 do
+		-- walls is zero-based.
+		for i = 0, 2 * n * n - 1 do
+			walls[i] = i
+		end
+		table.shuffle(walls)
+
+		local dox, doz = rand(0, n-1), rand(0, n-1)
+		for z = minp.z, maxp.z do
+			for y = minp.y + y2 * 5, minp.y + y2 * 5 + 4 do
+				local ivm = area:index(minp.x, y, z)
+				for x = minp.x, maxp.x do
+					if x == minp.x or z == minp.z or x == maxp.x or z == maxp.z then
+						data[ivm] = outer_wall
+					elseif (y - minp.y) % 5 == 0 then
+						if floor((z - minp.z) / 5) == doz and floor((x - minp.x) / 5) == dox and (z - minp.z) % 5 ~= 0 and (x - minp.x) % 5 ~= 0 and y ~= minp.y then
+							data[ivm] = node["air"]
+						else
+							data[ivm] = inner_floor
+						end
+					elseif (z - minp.z) % 5 == 0 or (x - minp.x) % 5 == 0 then
+						--data[ivm] = fun_caves.DEBUG and node["default:glass"] or inner_wall
+						data[ivm] = inner_wall
+					else
+						data[ivm] = node["air"]
+					end
+					ivm = ivm + 1
+				end
+			end
+		end
+
+		local set = unionfind(n * n)
+
+		for m = 0, #walls do
+			local c = walls[m]
+			local a = floor(c / 2)
+			local i = a % n
+			local j = floor(a / n)
+			local u = c % 2 == 0 and 1 or 0
+			local v = c % 2 == 1 and 1 or 0
+			local b = a + u + n * v
+			if i < n - u and j < n - v and set:find(a) ~= set:find(b) then
+				set:union(a, b)
+				local x = (i + u) * 5 + minp.x
+				local y = minp.y + y2 * 5
+				local z = (j + v) * 5 + minp.z
+				--if y > minp.y and rand(20) == 1 then
+				--	for z1 = z + 1, z + 4 do
+				--		ivm = area:index(x+1, y, z1)
+				--		for x1 = x + 1, x + 4 do
+				--			data[ivm] = node["air"]
+				--			ivm = ivm + 1
+				--		end
+				--	end
+				--end
+
+				for z1 = z + (1-v), z + (1-v) * 4 do
+					for y1 = y + 1, y + 4 do
+						local ivm = area:index(x + (1-u), y1, z1)
+						for x1 = x + (1-u), x + (1-u) * 4 do
+							if x1 < maxp.x and z1 < maxp.z and x1 > minp.x and z1 > minp.z then
+								data[ivm] = node["air"]
+							end
+							ivm = ivm + 1
+						end
+					end
+				end
+			end
+		end
+	end
+end