mirror of
https://github.com/appgurueu/modlib.git
synced 2024-11-26 01:03:46 +01:00
397 lines
15 KiB
Lua
397 lines
15 KiB
Lua
max_wear = 2 ^ 16 - 1
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function override(function_name, function_builder)
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local func = minetest[function_name]
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minetest["original_" .. function_name] = func
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minetest[function_name] = function_builder(func)
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end
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-- TODO fix modlib.minetest.get_gametime() messing up responsible "mod" determined by engine on crash
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get_gametime = minetest.get_gametime
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local get_gametime_initialized
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local function get_gametime_init(dtime)
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if get_gametime_initialized then
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-- if the profiler is being used, the globalstep can't be unregistered
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return
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end
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get_gametime_initialized = true
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assert(dtime == 0)
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local gametime = minetest.get_gametime()
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assert(gametime)
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function modlib.minetest.get_gametime()
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local imprecise_gametime = minetest.get_gametime()
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if imprecise_gametime > gametime then
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minetest.log("warning", "modlib.minetest.get_gametime(): Called after increment and before first globalstep")
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return imprecise_gametime
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end
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return gametime
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end
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for index, globalstep in pairs(minetest.registered_globalsteps) do
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if globalstep == get_gametime_init then
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table.remove(minetest.registered_globalsteps, index)
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break
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end
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end
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-- globalsteps of mods which depend on modlib will execute after this
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minetest.register_globalstep(function(dtime)
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gametime = gametime + dtime
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end)
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end
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minetest.register_globalstep(get_gametime_init)
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delta_times={}
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delays={}
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callbacks={}
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function register_globalstep(interval, callback)
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if type(callback) ~= "function" then
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return
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end
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table.insert(delta_times, 0)
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table.insert(delays, interval)
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table.insert(callbacks, callback)
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end
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function texture_modifier_inventorycube(face_1, face_2, face_3)
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return "[inventorycube{" .. string.gsub(face_1, "%^", "&")
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.. "{" .. string.gsub(face_2, "%^", "&")
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.. "{" .. string.gsub(face_3, "%^", "&")
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end
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function get_node_inventory_image(nodename)
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local n = minetest.registered_nodes[nodename]
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if not n then
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return
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end
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local tiles = {}
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for l, tile in pairs(n.tiles or {}) do
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tiles[l] = (type(tile) == "string" and tile) or tile.name
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end
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local chosen_tiles = { tiles[1], tiles[3], tiles[5] }
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if #chosen_tiles == 0 then
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return false
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end
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if not chosen_tiles[2] then
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chosen_tiles[2] = chosen_tiles[1]
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end
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if not chosen_tiles[3] then
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chosen_tiles[3] = chosen_tiles[2]
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end
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local img = minetest.registered_items[nodename].inventory_image
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if string.len(img) == 0 then
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img = nil
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end
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return img or texture_modifier_inventorycube(chosen_tiles[1], chosen_tiles[2], chosen_tiles[3])
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end
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function get_color_int(color)
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return color.b + (color.g*256) + (color.r*256*256)
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end
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function check_player_privs(playername, privtable)
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local privs=minetest.get_player_privs(playername)
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local missing_privs={}
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local to_lose_privs={}
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for priv, expected_value in pairs(privtable) do
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local actual_value=privs[priv]
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if expected_value then
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if not actual_value then
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table.insert(missing_privs, priv)
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end
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else
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if actual_value then
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table.insert(to_lose_privs, priv)
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end
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end
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end
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return missing_privs, to_lose_privs
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end
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minetest.register_globalstep(function(dtime)
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for k, v in pairs(delta_times) do
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local v=dtime+v
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if v > delays[k] then
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callbacks[k](v)
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v=0
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end
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delta_times[k]=v
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end
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end)
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form_listeners = {}
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function register_form_listener(formname, func)
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local current_listeners = form_listeners[formname] or {}
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table.insert(current_listeners, func)
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form_listeners[formname] = current_listeners
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end
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minetest.register_on_player_receive_fields(function(player, formname, fields)
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local handlers = form_listeners[formname]
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if handlers then
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for _, handler in pairs(handlers) do
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handler(player, fields)
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end
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end
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end)
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--+ Improved base64 decode removing valid padding
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function decode_base64(base64)
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local len = base64:len()
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local padding_char = base64:sub(len, len) == "="
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if padding_char then
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if len % 4 ~= 0 then
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return
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end
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if base64:sub(len-1, len-1) == "=" then
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base64 = base64:sub(1, len-2)
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else
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base64 = base64:sub(1, len-1)
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end
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end
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return minetest.decode_base64(base64)
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end
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liquid_level_max = 8
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--+ Calculates the flow direction of a flowingliquid node
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--# as returned by `minetest.get_node`
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--> 4 corner levels from -0.5 to 0.5 as list of `modlib.vector`
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function get_liquid_corner_levels(pos)
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local node = minetest.get_node(pos)
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local def = minetest.registered_nodes[node.name]
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local source, flowing = def.liquid_alternative_source, node.name
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local range = def.liquid_range or liquid_level_max
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local neighbors = {}
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for x = -1, 1 do
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neighbors[x] = {}
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for z = -1, 1 do
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local neighbor_pos = {x = pos.x + x, y = pos.y, z = pos.z + z}
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local neighbor_node = minetest.get_node(neighbor_pos)
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local level
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if neighbor_node.name == source then
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level = 1
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elseif neighbor_node.name == flowing then
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local neighbor_level = neighbor_node.param2 % 8
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level = (math.max(0, neighbor_level - liquid_level_max + range) + 0.5) / range
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end
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neighbor_pos.y = neighbor_pos.y + 1
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local node_above = minetest.get_node(neighbor_pos)
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neighbors[x][z] = {
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air = neighbor_node.name == "air",
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level = level,
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above_is_same_liquid = node_above.name == flowing or node_above.name == source
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}
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end
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end
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local function get_corner_level(x, z)
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local air_neighbor
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local levels = 0
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local neighbor_count = 0
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for nx = x - 1, x do
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for nz = z - 1, z do
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local neighbor = neighbors[nx][nz]
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if neighbor.above_is_same_liquid then
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return 1
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end
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local level = neighbor.level
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if level then
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if level == 1 then
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return 1
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end
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levels = levels + level
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neighbor_count = neighbor_count + 1
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elseif neighbor.air then
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if air_neighbor then
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return 0.02
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end
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air_neighbor = true
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end
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end
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end
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if neighbor_count == 0 then
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return 0
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end
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return levels / neighbor_count
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end
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local corner_levels = {
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{0, nil, 0},
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{1, nil, 0},
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{1, nil, 1},
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{0, nil, 1}
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}
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for index, corner_level in pairs(corner_levels) do
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corner_level[2] = get_corner_level(corner_level[1], corner_level[3])
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corner_levels[index] = modlib.vector.subtract_scalar(modlib.vector.new(corner_level), 0.5)
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end
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return corner_levels
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end
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flowing_downwards = modlib.vector.new{0, -1, 0}
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--+ Calculates the flow direction of a flowingliquid node
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--# as returned by `minetest.get_node`
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--> `modlib.minetest.flowing_downwards = modlib.vector.new{0, -1, 0}` if only flowing downwards
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--> surface direction as `modlib.vector` else
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function get_liquid_flow_direction(pos)
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local corner_levels = get_liquid_corner_levels(pos)
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local max_level = corner_levels[1][2]
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for index = 2, 4 do
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local level = corner_levels[index][2]
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if level > max_level then
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max_level = level
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end
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end
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local dir = modlib.vector.new{0, 0, 0}
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local count = 0
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for max_level_index, corner_level in pairs(corner_levels) do
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if corner_level[2] == max_level then
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for offset = 1, 3 do
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local index = (max_level_index + offset - 1) % 4 + 1
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local diff = corner_level - corner_levels[index]
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if diff[2] ~= 0 then
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diff[1] = diff[1] * diff[2]
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diff[3] = diff[3] * diff[2]
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if offset == 3 then
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diff = modlib.vector.divide_scalar(diff, math.sqrt(2))
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end
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dir = dir + diff
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count = count + 1
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end
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end
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end
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end
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if count ~= 0 then
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dir = modlib.vector.divide_scalar(dir, count)
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end
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if dir == modlib.vector.new{0, 0, 0} then
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if minetest.get_node(pos).param2 % 32 > 7 then
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return flowing_downwards
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end
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end
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return dir
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end
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--+ Raycast wrapper with proper flowingliquid intersections
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function raycast(_pos1, _pos2, objects, liquids)
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local raycast = minetest.raycast(_pos1, _pos2, objects, liquids)
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if not liquids then
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return raycast
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end
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local pos1 = modlib.vector.from_minetest(_pos1)
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local _direction = vector.direction(_pos1, _pos2)
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local direction = modlib.vector.from_minetest(_direction)
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local length = vector.distance(_pos1, _pos2)
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local function next()
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for pointed_thing in raycast do
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if pointed_thing.type ~= "node" then
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return pointed_thing
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end
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local _pos = pointed_thing.under
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local pos = modlib.vector.from_minetest(_pos)
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local node = minetest.get_node(_pos)
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local def = minetest.registered_nodes[node.name]
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if not (def and def.drawtype == "flowingliquid") then return pointed_thing end
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local corner_levels = get_liquid_corner_levels(_pos)
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local full_corner_levels = true
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for _, corner_level in pairs(corner_levels) do
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if corner_level[2] < 0.5 then
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full_corner_levels = false
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break
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end
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end
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if full_corner_levels then
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return pointed_thing
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end
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local relative = pos1 - pos
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local inside = true
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for _, prop in pairs(relative) do
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if prop <= -0.5 or prop >= 0.5 then
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inside = false
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break
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end
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end
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local function level(x, z)
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local function distance_squared(corner)
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return (x - corner[1]) ^ 2 + (z - corner[3]) ^ 2
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end
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local irrelevant_corner, distance = 1, distance_squared(corner_levels[1])
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for index = 2, 4 do
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local other_distance = distance_squared(corner_levels[index])
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if other_distance > distance then
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irrelevant_corner, distance = index, other_distance
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end
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end
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local function corner(off)
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return corner_levels[((irrelevant_corner + off) % 4) + 1]
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end
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local base = corner(2)
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local edge_1, edge_2 = corner(1) - base, corner(3) - base
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-- Properly selected edges will have a total length of 2
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assert(math.abs(edge_1[1] + edge_1[3]) + math.abs(edge_2[1] + edge_2[3]) == 2)
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if edge_1[1] == 0 then
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edge_1, edge_2 = edge_2, edge_1
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end
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local level = base[2] + (edge_1[2] * ((x - base[1]) / edge_1[1])) + (edge_2[2] * ((z - base[3]) / edge_2[3]))
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assert(level >= -0.5 and level <= 0.5)
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return level
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end
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inside = inside and (relative[2] < level(relative[1], relative[3]))
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if inside then
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-- pos1 is inside the liquid node
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pointed_thing.intersection_point = _pos1
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pointed_thing.intersection_normal = vector.new(0, 0, 0)
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return pointed_thing
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end
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local function intersection_normal(axis, dir)
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return {x = 0, y = 0, z = 0, [axis] = dir}
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end
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local function plane(axis, dir)
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local offset = dir * 0.5
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local diff_axis = (relative[axis] - offset) / -direction[axis]
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local intersection_point = {}
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for plane_axis = 1, 3 do
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if plane_axis ~= axis then
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local value = direction[plane_axis] * diff_axis + relative[plane_axis]
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if value < -0.5 or value > 0.5 then
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return
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end
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intersection_point[plane_axis] = value
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end
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end
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intersection_point[axis] = offset
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return intersection_point
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end
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if direction[2] > 0 then
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local intersection_point = plane(2, -1)
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if intersection_point then
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pointed_thing.intersection_point = (intersection_point + pos):to_minetest()
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pointed_thing.intersection_normal = intersection_normal("y", -1)
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return pointed_thing
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end
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end
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for coord, other in pairs{[1] = 3, [3] = 1} do
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if direction[coord] ~= 0 then
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local dir = direction[coord] > 0 and -1 or 1
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local intersection_point = plane(coord, dir)
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if intersection_point then
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local height = 0
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for _, corner in pairs(corner_levels) do
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if corner[coord] == dir * 0.5 then
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height = height + (math.abs(intersection_point[other] + corner[other])) * corner[2]
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end
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end
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if intersection_point[2] <= height then
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pointed_thing.intersection_point = (intersection_point + pos):to_minetest()
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pointed_thing.intersection_normal = intersection_normal(modlib.vector.index_aliases[coord], dir)
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return pointed_thing
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end
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end
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end
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end
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for _, triangle in pairs{
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{corner_levels[3], corner_levels[2], corner_levels[1]},
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{corner_levels[4], corner_levels[3], corner_levels[1]}
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} do
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local pos_on_ray = modlib.vector.ray_triangle_intersection(relative, direction, triangle)
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if pos_on_ray and pos_on_ray <= length then
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pointed_thing.intersection_point = (pos1 + modlib.vector.multiply_scalar(direction, pos_on_ray)):to_minetest()
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pointed_thing.intersection_normal = modlib.vector.triangle_normal(triangle):to_minetest()
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return pointed_thing
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end
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end
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end
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end
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return setmetatable({next = next}, {__call = next})
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end |