Spawn player on start block in new level

mods/lzr_levels/init.lua

@@ -15,6 +15,14 @@ lzr_levels.LAST_LEVEL = 0
 -- Mod storage for game progress
 local mod_storage = minetest.get_mod_storage()
 
+local flat_index_to_pos = function(index, size)
+	local d = index-1
+	local x = d % size.x
+	local y = math.floor((d / size.x) % size.y)
+	local z = math.floor((d / (size.x*size.y)) % size.z)
+	return vector.new(x,y,z)
+end
+
 -- Read the level schematics to find out some metadata about them
 -- and count the number of levels
 local analyze_levels = function()
@@ -38,12 +46,17 @@ local analyze_levels = function()
 		assert(schem, "Could not load level file: "..filename)
 		level_data[l].contains_rotatable_block = false
 		level_data[l].size = schem.size
+		local size = level_data[l].size
 		for d=1, #schem.data do
 			local nodename = schem.data[d].name
 			local is_rotatable = minetest.get_item_group(nodename, "rotatable") == 1
 			if is_rotatable then
 				level_data[l].contains_rotatable_block = true
-				break
+			end
+			if nodename == "lzr_teleporter:teleporter_off" then
+				local start = flat_index_to_pos(d, size)
+				start = vector.add(start, vector.new(0, 0.5, 0))
+				level_data[l].start_pos = start
 			end
 		end
 	end
@@ -144,7 +157,14 @@ end
 function lzr_levels.start_level(level)
 	current_level = level
 	local player = get_singleplayer()
-	local start_pos = vector.add(lzr_globals.LEVEL_POS, {x=4,y=-0.5,z=4})
+	local start_pos
+	if level_data[level].start_pos then
+		start_pos = vector.add(lzr_globals.LEVEL_POS, level_data[level].start_pos)
+	else
+		-- Fallback
+		local size = level_data[level].size
+		start_pos = vector.add(lzr_globals.LEVEL_POS, vector.new(math.floor(size.x/2), -0.5, math.floor(size.z/2)))
+	end
 	player:set_pos(start_pos)
 	player:set_look_horizontal(0)
 	lzr_levels.prepare_and_build_level(level)

mods/lzr_teleporter/init.lua

@@ -10,7 +10,7 @@ minetest.register_node("lzr_teleporter:teleporter", {
 		"lzr_teleporter_front.png",
 		"lzr_teleporter_rear.png",
 	},
-	groups = { breakable = 1 },
+	groups = { breakable = 1, teleporter = 2 },
 	sounds = lzr_sounds.node_sound_stone_defaults(),
 })
 
@@ -24,6 +24,6 @@ minetest.register_node("lzr_teleporter:teleporter_off", {
 		"lzr_teleporter_off_front.png",
 		"lzr_teleporter_off_rear.png",
 	},
-	groups = { breakable = 1 },
+	groups = { breakable = 1, teleporter = 1 },
 	sounds = lzr_sounds.node_sound_stone_defaults(),
 })