From c2d57c6cb49ce23f8485708f435c325f132742bb Mon Sep 17 00:00:00 2001
From: Jordach <jordach.snelling@gmail.com>
Date: Thu, 23 Jul 2015 14:02:51 +0100
Subject: [PATCH] add forcefields, size is 31k, can be configured.

---
 mods/mapgen/forcefields.lua           |  53 ++++++++++++++++++++++++++
 mods/mapgen/init.lua                  |  17 ++-------
 mods/mapgen/textures/mapgen_force.png | Bin 231 -> 188 bytes
 3 files changed, 56 insertions(+), 14 deletions(-)
 create mode 100644 mods/mapgen/forcefields.lua

diff --git a/mods/mapgen/forcefields.lua b/mods/mapgen/forcefields.lua
new file mode 100644
index 0000000..e6851de
--- /dev/null
+++ b/mods/mapgen/forcefields.lua
@@ -0,0 +1,53 @@
+--forcefields, used to limit the world size. Once the walls have been assembled you can disable the mod by commenting out line 13 for mapgen/init.lua
+
+-- configure world size here - max = 30000, min = 32 (can be smaller, spawn might be outside of area.)
+
+-- note: default settings are 31000
+
+-- Warning: you will have to set all six dimensions.
+
+x_pos_position = 31000
+x_nega_position = -31000
+
+y_pos_position = 31000
+y_nega_position = -31000
+
+z_pos_position = 31000
+z_nega_position = -31000
+
+minetest.register_node("mapgen:force_field", {
+	description = "Alien Forcefield",
+	tiles = {"mapgen_force.png"},
+	sunlight_propagates = true,
+	paramtype = "light",
+	drawtype = "glasslike",
+	inventory_image = minetest.inventorycube("mapgen_force_inv_wield.png"),
+	wield_image = minetest.inventorycube("mapgen_force_inv_wield.png"),
+	is_ground_content = true,
+	groups = {not_in_creative_inventory=1},
+})
+
+-- sorry, inefficient code - can't do any better yet. not unless a contributor wants to improve it.
+
+minetest.register_abm({
+	nodenames = {"air"},
+	interval = 2,
+	chance = 1,
+	action = function(pos, node)
+		if x_nega_position == pos.x then
+			minetest.set_node(pos, {name="mapgen:force_field"})
+		elseif x_pos_position == pos.x then
+			minetest.set_node(pos, {name="mapgen:force_field"})
+		elseif y_nega_position == pos.y then
+			minetest.set_node(pos, {name="mapgen:force_field"})
+		elseif y_pos_position == pos.y then
+			minetest.set_node(pos, {name="mapgen:force_field"})
+		elseif z_nega_position == pos.z then
+			minetest.set_node(pos, {name="mapgen:force_field"})
+		elseif z_pos_position == pos.z then
+			minetest.set_node(pos, {name="mapgen:force_field"})
+		else
+			--no forcefields constructed.
+		end
+	end,
+})
\ No newline at end of file
diff --git a/mods/mapgen/init.lua b/mods/mapgen/init.lua
index ccd90a4..770654d 100644
--- a/mods/mapgen/init.lua
+++ b/mods/mapgen/init.lua
@@ -9,6 +9,9 @@ dofile(minetest.get_modpath("mapgen").."/nodes.lua")
 dofile(minetest.get_modpath("mapgen").."/flowers.lua")
 dofile(minetest.get_modpath("mapgen").."/functions.lua")
 
+-- enable forcefields (useful for server admins
+dofile(minetest.get_modpath("mapgen").."/forcefields.lua")
+
 minetest.register_alias("mapgen_stair_cobble", "stairs:stair_cobble")
 minetest.register_alias("mapgen_water_source", "mapgen:water_source")
 minetest.register_alias("mapgen_lava_source", "mapgen:lava_source")
@@ -860,18 +863,4 @@ minetest.register_node(":base:leaves", {
 	drop = 'mapgen:dirt',
 	groups = {crumbly=3, soil=1, not_in_creative_inventory=1},
 	sounds = default.node_sound_dirt_defaults(),
-})
-
-minetest.register_node("mapgen:force_field", {
-	description = "Alien Forcefield",
-	tiles = {
-		{name="mapgen_force.png", animation={type="vertical_frames", aspect_w=128, aspect_h=128, length=1.5}},
-	},
-	sunlight_propagates = true,
-	paramtype = "light",
-	drawtype = "glasslike",
-	inventory_image = minetest.inventorycube("mapgen_force_inv_wield.png"),
-	wield_image = minetest.inventorycube("mapgen_force_inv_wield.png"),
-	is_ground_content = true,
-	groups = {not_in_creative_inventory=1},
 })
\ No newline at end of file
diff --git a/mods/mapgen/textures/mapgen_force.png b/mods/mapgen/textures/mapgen_force.png
index cf6f0f23104f57d0d8c74de779230c857901a2cf..a3459e347a54ebec89682d529662dcf77b751fd8 100644
GIT binary patch
delta 114
zcmV-&0FD3W0lWc_7YYyv1^@s6AM^iVks&@^2Nw)DIT6x&`v3p{JV``BR5;6HU|9d0
z0R@oCM+Q#&{}Zj*Y5#vz`GM0+)i9vUupz2>_=N#xBEhX0Bk_@?875DWW=g{V07BDv
UzpeHadH?_b07*qoM6N<$f`<Vt-T(jq

delta 158
zcmdnP_?&TqI9CG)8v_Fa)6|zr6BX_185#Mtt<&5k{{zL+JzX3_GVZ;-v5@zG0S}AA
z>fi4tZM1T87LGWovfkL(z;Z9ozN|g*Yd@FUTiyHS-7jg-VOa61Lcu6OAnC#fehB@A
zpQV$rnW6buy@Cgi#0!w<0{aW{974>08~-^>kZ6(e*)96;KTo=v9MDQm22WQ%mvv4F
FO#pwcINAUJ