Update README.md

including bugfix in Globalstep timer

README.md

@@ -0,0 +1,22 @@
+# minetest-subspacewalker
+Go trough walls, rock or lava using Subspace Walker tool..
+
+The mod contains a tool that allow you to go trough blocks. If the tool is active you are in a Subspace bubble, so the real blocks around you are not there and you can walk trough them.
+
+How to use:
+- You need to hold the Subspace Walker tool in the hand and use them (right-click) for activation.
+- Sneaking results in a lower Subspace and you go downwards.
+- Jumping bring the nodes below you back to outside Subspace so you can go upwards
+- To disable the Subspace Walker Tool just try to place it (left click) or take something other in the hand
+
+![Alt text](https://github.com/bell07/minetest-subspacewalker/raw/master/screenshot.png)
+
+The tool can be crafted in as a vertical stick:
+```
+default:diamond
+default:mese_crystal
+group:stick
+```
+
+Mod dependencies: none
+License: GPL-V3

init.lua

@@ -1,51 +1,38 @@
 -- constant subspace size
-local c_subspacesize = 3
+local c_subspacesize = 8
+
+-- chance for node restoral per second (No worries, all nodes will be restored, but not immediately)
+local c_randomize_restore = 5
+
+-- transform compatible nodes only
+local c_restricted_mode = true
+
+local compatible_nodes = {
+	"default:stone",
+	"default:dirt"
+}
 
 -- Check if the subspace still enabled for user (or can be disabled)
-local function ssw_is_enabled(user)
-	if not user then -- if user leave the game, disable them
+local function ssw_get_wielded(playername)
+	local user = minetest.get_player_by_name(playername)
+	-- if user leave the game, disable them
+	if not user then
 		return false
 	end
-
+	-- user does not hold the walker in the hand
 	local item = user:get_wielded_item()
 	if not item or item:get_name() ~= "subspacewalker:walker" then
 		return false
 	end
-	return true
+	-- all ok, still active
+	return item
 end
 
--- Hide a node
-local function hide_node(pos)
-	local node = minetest.get_node(pos)
-	if node and node.name ~= "air" and node.name ~= "subspacewalker:subspace" and node.name ~= 'ignore' then
-		-- Save the node's original name
-		minetest.get_meta(pos):set_string("subspacewalker", node.name)
-		-- Swap in placeholder node
-		node.name = "subspacewalker:subspace"
-		minetest.swap_node(pos, node)
-	end
-end
-
--- get y offset for sneaking or jumping
-local function get_player_y_offset(user)
-	local control = user:get_player_control()
-	local y = 0.5
-	if control.jump then
-		y = y + 1
-	end
-	if control.sneak then
-		y = y - 1
-	end
-	return y
-end
-
--- subspacewalker runtime object
+-- subspacewalker runtime data
 local subspacewalker = {
 	users_in_subspace = {},
-	timer = 0,
 }
 
-------------- Minetest registrations -----------------------
 -- tool definition
 minetest.register_tool("subspacewalker:walker", {
 	description = "Subspace Walker",
@@ -54,7 +41,7 @@ minetest.register_tool("subspacewalker:walker", {
 	tool_capabilities = {},
 	range = 0,
 	on_use = function(itemstack, user, pointed_thing)
-		subspacewalker.users_in_subspace[user:get_player_name()] = user
+		subspacewalker.users_in_subspace[user:get_player_name()] = {timer = 1}
 	end,
 	on_place = function(itemstack, user, pointed_thing)
 		subspacewalker.users_in_subspace[user:get_player_name()] = nil
@@ -66,22 +53,95 @@ minetest.register_tool("subspacewalker:walker", {
 
 -- Globalstep check for nodes to hide
 minetest.register_globalstep(function(dtime)
-	subspacewalker.timer = subspacewalker.timer + dtime
-	if subspacewalker.timer < 0.25 then
-		return
-	end
-
-	for name, user in pairs(subspacewalker.users_in_subspace) do
-		if not ssw_is_enabled(user) then
-			subspacewalker.users_in_subspace[user:get_player_name()] = nil
+	-- check each player with walker active
+	for playername, ssw in pairs(subspacewalker.users_in_subspace) do
+		ssw.timer = ssw.timer + dtime
+		local ssw_stack = ssw_get_wielded(playername)
+		if not ssw_stack then
+			subspacewalker.users_in_subspace[playername] = nil
 		else
+			local user = minetest.get_player_by_name(playername)
+			local control = user:get_player_control()
 			local userpos = user:getpos()
-			local ydelta = get_player_y_offset(user)
-			for x=userpos.x-c_subspacesize, userpos.x+c_subspacesize do
-				for y=userpos.y+ydelta, userpos.y+c_subspacesize*2 do -- we need the ground under the user
-					for z=userpos.z-c_subspacesize, userpos.z+c_subspacesize do
-						hide_node({x=x,y=y,z=z})
-					end
+
+			--regular step, once each second
+			if ssw.timer > 0.2 or --0.5
+					--sneaking but not in air
+					(control.sneak and userpos.y - 0.5 == math.floor(userpos.y)) then
+				ssw.timer = 0
+
+				-- set offset for jump or sneak
+				userpos.y = math.floor(userpos.y+0.5)
+				if control.jump then
+					userpos.y = userpos.y + 1
+				elseif control.sneak then
+					userpos.y = userpos.y -1
+				end
+				userpos = vector.round(userpos)
+
+				--voxel_manip magic
+				local pos1 = {x=userpos.x-c_subspacesize, y=userpos.y, z=userpos.z-c_subspacesize}
+				local pos2 = {x=userpos.x+c_subspacesize, y=userpos.y+c_subspacesize, z=userpos.z+c_subspacesize}
+
+				local manip = minetest.get_voxel_manip()
+				local min_c, max_c = manip:read_from_map(pos1, pos2)
+				local area = VoxelArea:new({MinEdge=min_c, MaxEdge=max_c})
+
+				local data = manip:get_data()
+				local changed = false
+
+				local ssw_id = minetest.get_content_id("subspacewalker:subspace")
+				local air_id = minetest.get_content_id("air")
+
+				local transform_count = 0
+
+				-- check each node in the area
+				for i in area:iterp(pos1, pos2) do
+					local nodepos = area:position(i)
+--					if math.random(0, vector.distance(userpos, nodepos)) < 2 then
+						local cur_id = data[i]
+						if cur_id and cur_id ~= ssw_id and cur_id ~= air_id then
+							local cur_name = minetest.get_name_from_content_id(cur_id)
+							if c_restricted_mode then
+								for _, compat in ipairs(compatible_nodes) do
+									if compat == cur_name then
+										data[i] = ssw_id
+										minetest.get_meta(area:position(i)):set_string("subspacewalker", cur_name)
+										changed = true
+										transform_count = transform_count + 1
+									end
+								end
+							else
+								data[i] = ssw_id
+								minetest.get_meta(area:position(i)):set_string("subspacewalker", cur_name)
+								changed = true
+								transform_count = transform_count + 1
+							end
+						end
+--					end
+				end
+				-- save changes if needed
+				if changed then
+					manip:set_data(data)
+					manip:write_to_map()
+					local wear = ssw_stack:get_wear()
+					ssw_stack:add_wear(transform_count)
+					user:set_wielded_item(ssw_stack)
+				end
+			end
+
+			-- jump special handling. Restore node under the player
+			if control.jump then
+				local userpos = user:getpos()
+				userpos.y = math.floor(userpos.y-0.5)
+				local node = minetest.get_node(userpos)
+				local meta = minetest.get_meta(userpos)
+				local data = meta:to_table()
+				if data.fields.subspacewalker then
+					node.name = data.fields.subspacewalker
+					data.fields.subspacewalker = nil
+					meta:from_table(data)
+					minetest.swap_node(userpos, node)
 				end
 			end
 		end
@@ -104,8 +164,8 @@ minetest.register_node("subspacewalker:subspace", {
 -- ABM on hidden blocks checks if there can be restored again
 minetest.register_abm({
 	nodenames = { "subspacewalker:subspace" },
-	interval = 0.1,
-	chance = 1,
+	interval = 0.5,
+	chance = c_randomize_restore,
 	action = function(pos, node)
 		if node.name == 'ignore' then 
 			return 
@@ -113,16 +173,18 @@ minetest.register_abm({
 
 		local can_be_restored = true
 		-- check if the node can be restored
-		for name, user in pairs(subspacewalker.users_in_subspace) do
-			if not ssw_is_enabled(user) then
-				subspacewalker.users_in_subspace[user:get_player_name()] = nil
+		for playername, _ in pairs(subspacewalker.users_in_subspace) do
+			local ssw_stack = ssw_get_wielded(playername)
+			if not ssw_stack then
+				subspacewalker.users_in_subspace[playername] = nil
 			else
+				local user = minetest.get_player_by_name(playername)
 				local userpos = user:getpos()
-				local ydelta = get_player_y_offset(user)
+				userpos.y = math.floor(userpos.y+0.5)
 				if ( pos.x >= userpos.x-c_subspacesize-1 and pos.x <= userpos.x+c_subspacesize+1) and  -- "+1" is to avoid flickering of nodes. restoring range is higher then the effect range
-						( pos.y >= userpos.y+ydelta and pos.y <= userpos.y+c_subspacesize*2+1 ) and
+						( pos.y >= userpos.y and pos.y <= userpos.y+c_subspacesize+1 ) and
 						( pos.z >= userpos.z-c_subspacesize-1 and pos.z <= userpos.z+c_subspacesize+1) then
-					can_be_restored = false  --active user in range
+					can_be_restored = false --active user in range
 				end
 			end
 		end
@@ -133,9 +195,9 @@ minetest.register_abm({
 			local meta = minetest.get_meta(pos)
 			local data = meta:to_table()
 			node.name = data.fields.subspacewalker
-					data.fields.subspacewalker = nil
-					meta:from_table(data)
-					minetest.swap_node(pos, node)
+			data.fields.subspacewalker = nil
+			meta:from_table(data)
+			minetest.swap_node(pos, node)
 		end
 	end
 })