Changed many things.

Added setnav node and prevented setnavving before dematting.
Fixed the remat sound, I think.
Various things.

demat.lua

@@ -1,4 +1,5 @@
-function tardis.demat (owner)
+function tardis.demat (owner, name)
+	if owner ~= name then return false, "You don't own that TARDIS!" end
 	local pos = tardis.tardises [owner]["exterior"]
 
 	minetest.set_node (pos, {name = "tardis:tardis_demat"})
@@ -10,6 +11,7 @@ function tardis.demat (owner)
 		max_hear_distance = 100 ,
 		gain              = 10  ,
 	})
+	return true
 end
 
 

functions.lua

@@ -15,10 +15,11 @@ end
 
 function tardis:spawn_interior (pos, owner)
 	local place_pos = {
-		x = pos ["x"] ,
+		x = tardis.count * 12 ,
 		y = 30000    ,
-		z = pos ["z"] ,
+		z = 0 ,
 	}
+	tardis.count = tardis.count + 1
 	local interior_doors_pos = {
 		x = (place_pos ["x"] + 5) ,
 		y = (place_pos ["y"] + 1) ,
@@ -29,6 +30,11 @@ function tardis:spawn_interior (pos, owner)
 		y = (place_pos ["y"] + 2) ,
 		z = (place_pos ["z"] + 7) ,
 	}
+	local nav_pos = {
+		x = (place_pos ["x"] + 4) ,
+		y = (place_pos ["y"] + 2) ,
+		z = (place_pos ["z"] + 8) ,
+	}
 
 	minetest.place_schematic (place_pos, modpath .. "/schematics/tardis_interior.mts")
 
@@ -39,6 +45,9 @@ function tardis:spawn_interior (pos, owner)
 
 	local demat_meta = minetest.get_meta (demat_lever_pos)
 	demat_meta:set_string ("owner", owner)
+	
+	local nav_meta = minetest.get_meta (nav_pos)
+	nav_meta:set_string ("owner", owner)
 
 	local interior_doors_meta = minetest.get_meta (interior_doors_pos)
 	interior_doors_meta:set_string ("owner", owner)
@@ -52,6 +61,8 @@ end
 
 function tardis.set_nav (player, owner)
 	local player_name = player:get_player_name()
+	if player_name ~= owner then minetest.chat_send_player(player_name, "You don't own that TARDIS!"); return end
+	if tardis.tardises[owner]["in_vortex"] == false then minetest.chat_send_player(player_name, "You must dematerialize the TARDIS first!"); return end
 
 	minetest.show_formspec (player_name, "tardis:remat_form",
 	"size[7,3]" ..

init.lua

@@ -1,4 +1,5 @@
 tardis = {}
+tardis.count = 0
 tardis.tardises = {}
 
 local modname   = minetest.get_current_modname()

nodes.lua

@@ -1,5 +1,5 @@
 minetest.register_node ("tardis:tardis", {
-	decription        = "Time And Relative Dimention In Space" ,
+	decription        = "Time And Relative Dimension In Space" ,
 	tiles             = { "tardis_exterior.png" } ,
 	use_texture_alpha = true ,
 	drawtype          = "mesh" ,
@@ -51,15 +51,15 @@ minetest.register_node ("tardis:demat_lever_on", {
 		local meta        = minetest.get_meta(pos)
 		local owner       = meta:get_string("owner")
 
-		if (tardis.remat (owner) == false) then
-			minetest.chat_send_player (player_name, "Nav Not Set!!")
+		local rematted, msg = tardis.remat (owner, player:get_player_name())
+		if (rematted == false) then
+			minetest.chat_send_player (player_name, msg)
 		else
-			minetest.sound_play ("tardis_demat", {
+			minetest.sound_play ("tardis_remat", {
 				pos               = pos ,
-				max_hear_distance = 10 ,
-				gain              = 10 ,
-			})
-
+				max_hear_distance = 100 ,
+				gain              = 10  ,
+			})	
 			minetest.swap_node (pos, {name = "tardis:demat_lever_off"})
 		end
 	end
@@ -77,15 +77,36 @@ minetest.register_node ("tardis:demat_lever_off", {
 	on_rightclick     = function (pos, node, player, itemstack, pointed_thing)
 		local meta  = minetest.get_meta(pos)
 		local owner = meta:get_string("owner")
+		
+		local dematted, msg = tardis.demat (owner, player:get_player_name())
 
-		tardis.demat (owner)
-		minetest.sound_play ("tardis_demat", {
-			pos               = pos ,
-			max_hear_distance = 10  ,
-			gain              = 10  ,
-		})
+		if dematted then
+			minetest.sound_play ("tardis_demat", {
+				pos               = pos ,
+				max_hear_distance = 10  ,
+				gain              = 10  ,
+			})
 
-		minetest.swap_node (pos, {name = "tardis:demat_lever_on"})
+			minetest.swap_node (pos, {name = "tardis:demat_lever_on"})
+		else
+			minetest.chat_send_player(player:get_player_name(), msg)
+		end
+	end ,
+})
+
+minetest.register_node ("tardis:navigator", {
+	groups            = {crumbly = 1} ,
+	tiles             = {"tardis_navigator.png"} ,
+	drawtype          = "signlike" ,
+	paramtype         = "light" ,
+	paramtype2        = "wallmounted" ,
+	is_ground_content = true ,
+
+	on_rightclick     = function (pos, node, player, itemstack, pointed_thing)
+		local meta  = minetest.get_meta(pos)
+		local owner = meta:get_string("owner")
+
+		tardis.set_nav(player, owner)
 	end ,
 })
 

remat.lua

@@ -1,6 +1,7 @@
-function tardis.remat (owner)
+function tardis.remat (owner, name)
+	if owner ~= name then return false, "You don't own that TARDIS!" end
 	if (tardis.tardises [owner]["destination"] == nil) then
-		return false
+		return false, "Coordinates haven't been set yet!"
 	else
 		local pos = tardis.tardises [owner]["destination"]
 
@@ -17,6 +18,7 @@ function tardis.remat (owner)
 			max_hear_distance = 100 ,
 			gain              = 10  ,
 		})
+		return true
 	end
 end