Localize variables. Prevent shafts from damaging trees.

dungeon.lua

@@ -186,10 +186,10 @@ fun_caves.dungeon = function(minp_in, maxp_in, data, p2data, area, node, heightm
 							else
 								t = 44 - z
 							end
-							t = math.floor(t / 44 * 22)
+							t = math.floor(t / 44 * 10)
 
 							if x < 2 or x > 9 or z < 2 or z > 9 then
-								if math.floor((y - minp.y) % 22) == t then
+								if math.floor((y - minp.y) % 10) == t then
 									data[ivm] = node['default:cobble']
 								else
 									data[ivm] = node['air']
@@ -210,10 +210,10 @@ fun_caves.dungeon = function(minp_in, maxp_in, data, p2data, area, node, heightm
 		return
 	end
 
-	minp = table.copy(minp_in)
+	local minp = table.copy(minp_in)
 	minp.x = minp.x + 10
 	minp.z = minp.z + 10
-	maxp = table.copy(maxp_in)
+	local maxp = table.copy(maxp_in)
 	maxp.x = maxp.x - 9
 	maxp.z = maxp.z - 9
 	local level = math.min(6, math.ceil(maxp.y / math.floor(max_depth / -6)))
@@ -381,5 +381,5 @@ fun_caves.dungeon = function(minp_in, maxp_in, data, p2data, area, node, heightm
 		end
 	end
 
-	return true, true
+	return true, true, true
 end

mapgen.lua

@@ -430,18 +430,20 @@ local function generate(p_minp, p_maxp, seed)
 		end
 
 		if fun_caves.dungeon then
-			write, write_p2 = fun_caves.dungeon(minp, maxp, data, p2data, area, node, heightmap)
-			if write then
+			local full
+			write, write_p2, full = fun_caves.dungeon(minp, maxp, data, p2data, area, node, heightmap)
+			if write and full then
 				break
 			end
 		end
 
 		if fun_caves.cavegen and fun_caves.decogen then
-			local h2
-			write, h2 = fun_caves.cavegen(minp, maxp, data, area, node, heightmap, underzone, ground_nodes)
+			local h2, write_cave
+			write_cave, h2 = fun_caves.cavegen(minp, maxp, data, area, node, heightmap, underzone, ground_nodes)
 			if h2 then
 				heightmap = h2
 			end
+			write = write or write_cave
 
 			local biomemap
 			if fun_caves.use_bi_hi then