fork from InfinityProject's mod

http://minetest.net/forum/viewtopic.php?id=3191

README.txt

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+Xray Mod by InfinityProject version 0.1
+
+License: Code GPLv3 Textures WTFPL It's just transparnecy :)
+
+Inspired by the famous Minecraft mod.
+
+Please note that this is a beta release. There may be bugs 
+  and the transformation between regular stone and invisible
+  stone takes a while.
+
+I will speed this up in later versions.

xray/depends.txt

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+default

xray/init.lua

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+local function xray(mode)
+XRAY_MODE = mode
+end 
+
+minetest.register_chatcommand("xray", {
+	params = "<mode>",
+	description = "Make stone invisible.",
+	privs = {shout=true},	
+	func = function(name, param)
+		if param == 'on'  then xray(1)
+		  minetest.chat_send_player(name, "Xray turned on.")
+		elseif param == 'off' then xray(2)
+		  minetest.chat_send_player(name, "Xray turned off.")
+		else
+		  minetest.chat_send_player(name, "Please enter 'on' or 'off'.")
+		end
+	end,
+})
+
+minetest.register_abm({
+		nodenames = {"default:stone", "xray:stone"},
+		interval = 0,
+		chance = 4,	
+		
+		action = function(pos, node, active_object_count, active_object_count_wider)
+		  if XRAY_MODE == 1 then
+			  if node.name == "default:stone" then
+				  minetest.env:add_node(pos,{name="xray:stone"})
+		  elseif XRAY_MODE == 2 then
+		      if node.name == "xray:stone" then
+			      minetest.env:add_node(pos,{name="xray:stone"})
+	
+				end
+			end
+		end
+	end
+})
+
+minetest.register_node("xray:stone", {
+	description = "Xray Stone",
+	tiles = {"xray_stone.png"},
+	is_ground_content = true,
+	groups = {cracky=3},
+	drop = 'default:cobble',
+	legacy_mineral = true,
+	sounds = default.node_sound_stone_defaults(),
+})
+