fix pandorabox-io/pandorabox.io#337

elevator.lua

@@ -135,10 +135,9 @@ minetest.register_node("travelnet:elevator", {
 --                            "field[0.3,7.6;6,0.7;owner_name;(optional) owned by:;]"..
                             "button_exit[6.3,6.2;1.7,0.7;station_set;"..S("Store").."]" );
 
-       local p = {x=pos.x, y=pos.y+1, z=pos.z}
-       local p2 = minetest.dir_to_facedir(placer:get_look_dir())
-       minetest.add_node(p, {name="travelnet:elevator_top", paramtype2="facedir", param2=p2})
-       travelnet.show_nearest_elevator( pos, placer:get_player_name(), p2 );
+       local top_pos = {x=pos.x, y=pos.y+1, z=pos.z}
+       minetest.set_node(top_pos, {name="travelnet:hidden_top"})
+       travelnet.show_nearest_elevator( pos, placer:get_player_name(), minetest.dir_to_facedir(placer:get_look_dir()));
     end,
 
     on_receive_fields = travelnet.on_receive_fields,
@@ -163,8 +162,8 @@ minetest.register_node("travelnet:elevator", {
        local pos  = pointed_thing.above;
        local node = minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z});
 	   local def = minetest.registered_nodes[node.name]
-       -- leftover elevator_top nodes can be removed by placing a new elevator underneath
-       if not def or not def.buildable_to then
+       -- leftover top nodes can be removed by placing a new elevator underneath
+       if (not def or not def.buildable_to) and node.name ~= "travelnet:hidden_top" then
           minetest.chat_send_player(
 						placer:get_player_name(),
 						S('Not enough vertical space to place the travelnet box!')
@@ -175,12 +174,12 @@ minetest.register_node("travelnet:elevator", {
     end,
 
     on_destruct = function(pos)
-            local p = {x=pos.x, y=pos.y+1, z=pos.z}
-	    minetest.remove_node(p)
+        pos = {x=pos.x, y=pos.y+1, z=pos.z}
+	    minetest.remove_node(pos)
     end
 })
 
-minetest.register_alias("travelnet:elevator_top", "air")
+minetest.register_alias("travelnet:hidden_top", "air")
 
 --if( minetest.get_modpath("technic") ~= nil ) then
 --        minetest.register_craft({

init.lua

@@ -865,11 +865,15 @@ travelnet.on_receive_fields = function(pos, formname, fields, player)
    local player_model_vec = vector.new(0, player_model_bottom, 0);
    local target_pos = travelnet.targets[ owner_name ][ station_network ][ fields.target ].pos;
 
-	 -- check if the node above the box (upper half) is air
-	 if minetest.get_node(vector.add(target_pos, {x=0, y=1, z=0})).name ~= "air" then
-		 -- replace with air if blocked
-		 minetest.set_node(target_pos, {name="air"})
-	 end
+	local top_pos = {x=pos.x, y=pos.y+1, z=pos.z}
+	local top_node = minetest.get_node(top_pos)
+	if top_node.name ~= "travelnet:hidden_top" then
+		local def = minetest.registered_nodes[top_node.name]
+		if def and def.buildable_to then
+			minetest.set_node(top_pos, {name="travelnet:hidden_top"})
+		end
+	end
+
    player:move_to( vector.add(target_pos, player_model_vec), false);
 
    if( travelnet.enable_travelnet_effect ) then
@@ -1031,8 +1035,25 @@ travelnet.can_dig_old = function( pos, player, description )
    return true;
 end
 
-
-
+-- invisible node to place inside top of travelnet box and elevator
+minetest.register_node("travelnet:hidden_top", {
+	drawtype = "nodebox",
+	paramtype = "light",
+	sunlight_propagates = true,
+	pointable = false,
+	diggable = false,
+	drop = "",
+	groups = {not_in_creative_inventory = 1},
+	tiles = {"travelnet_blank.png"},
+	node_box = {
+		type = "fixed",
+		fixed = { -0.5, 0.45,-0.5,0.5, 0.5, 0.5},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = { -0.5, 0.45,-0.5,0.5, 0.5, 0.5},
+	},
+})
 
 
 if( travelnet.travelnet_effect_enabled ) then

travelnet.lua

@@ -49,9 +49,12 @@ minetest.register_node("travelnet:travelnet", {
     light_source = 10,
 
     after_place_node  = function(pos, placer, itemstack)
-	local meta = minetest.get_meta(pos);
-	travelnet.reset_formspec( meta );
-        meta:set_string("owner",          placer:get_player_name() );
+		local meta = minetest.get_meta(pos);
+		travelnet.reset_formspec( meta );
+        meta:set_string("owner", placer:get_player_name() );
+
+		local top_pos = {x=pos.x, y=pos.y+1, z=pos.z}
+		minetest.set_node(top_pos, {name="travelnet:hidden_top"})
     end,
 
     on_receive_fields = travelnet.on_receive_fields,
@@ -77,7 +80,8 @@ minetest.register_node("travelnet:travelnet", {
        local pos = pointed_thing.above;
        local node = minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z})
        local def = minetest.registered_nodes[node.name]
-       if not def or not def.buildable_to then
+	   -- leftover top nodes can be removed by placing a new travelnet underneath
+       if (not def or not def.buildable_to) and node.name ~= "travelnet:hidden_top" then
 
           minetest.chat_send_player(
 						placer:get_player_name(),
@@ -88,6 +92,10 @@ minetest.register_node("travelnet:travelnet", {
        return minetest.item_place(itemstack, placer, pointed_thing);
     end,
 
+	on_destruct = function(pos)
+        pos = {x=pos.x, y=pos.y+1, z=pos.z}
+	    minetest.remove_node(pos)
+    end
 })
 
 --[