Post your modding questions here

[1244]

Thank you kaeza. It's working.

[ashenk69]

I've been trying to figure out how to get this one to work. I am trying to show another nodes inventory through another node's formspec. I get it to retrieve the inventory properly but I'm not sure how to set its size to display the grid.

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on_construct = function(pos)
        local meta = minetest.env:get_meta(pos)
        meta:set_string("formspec",
                "size[8,9]"..
                "list[nodemeta:"..meta:get_int("x")..","..meta:get_int("y")..","..meta:get_int("z")..";source;0,0;8,4;]"..
                "list[current_player;main;0,5;8,4;]")
        meta:set_string("infotext", "Stockpile")
        --I'm not sure which list I'm supposed to set to get this to work
    end,

[Likwid H-Craft]

Ok you see the paper at, well that where I would like have the craft, 9 boxs at, but it didn't work so how do I make it work?

[oxenfreedan]

So... can someone post a Utube vid on how to make items move from one chest to another in the tecnic mod.

[1244]

In which way I can get pseudo random number in minetest. I know method next() but if I do this:

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local i = next(0,100)

I have error.

[Calinou]

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my_random_number = math.random(10, 100)

This generates a number between 10 and 100.

[quick.dudley]

If a mod which affects map generation is added to an existing map, what happens?

[Sokomine]

Newly generated map chunks will be generated with the mod in effect. Already existing map chunks will remain the same. Depending on how large your world is, you may have to go far out for the new mod to take effect.

[Evergreen]

Hi, I'm back to this topic again. I'm making quartz from minecraft, and I want to know how to register ores, and how to make it as rare as iron. Also, I wanted to know what license the textures from minecraft are under.

[LionLAD]

Hi, I'm back to this topic again. I'm making quartz from minecraft, and I want to know how to register ores, and how to make it as rare as iron. Also, I wanted to know what license the textures from minecraft are under.

the code to register an ore in order for it to spawn at -*** or what ever you set it to and it's very lanthy one of the more complex codes in minetest

[Evergreen]

There is a register ore function.

[ch98]

I need help.
I need to take away coal from all 18box but I can from only 1st one.
code:

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Code: Select all

local function placeNode(pos)
    local n = minetest.env:get_node(pos).name
      if (n == "air") then
    minetest.env:add_node(pos, {name="forcefield:forcefield"})
end
end


local function placeCubicShell(pos, sideLen)
   local s = math.floor(sideLen/2)
   for dx = -s, s do
      for dy = -s, s do
         placeNode({ x = pos.x + dx, y = pos.y + dy, z = pos.z - s })
         placeNode({ x = pos.x + dx, y = pos.y + dy, z = pos.z + s })
      end
   end
   for dy = -s, s do
      for dz = -s, s do
         placeNode({ x = pos.x - s, y = pos.y + dy, z = pos.z + dz })
         placeNode({ x = pos.x + s, y = pos.y + dy, z = pos.z + dz })
      end
   end
   for dz = -s, s do
      for dx = -s, s do
         placeNode({ x = pos.x + dx, y = pos.y - s, z = pos.z + dz })
         placeNode({ x = pos.x + dx, y = pos.y + s, z = pos.z + dz })
      end
   end
end



local function removeNode(pos)
      local n = minetest.env:get_node(pos).name
    if (n == "forcefield:forcefield") then
    minetest.env:add_node(pos, {name="air"})
end
end

local function removeCubicShell(pos, sideLen)
   local s = math.floor(sideLen/2)
   for dx = -s, s do
      for dy = -s, s do
         removeNode({ x = pos.x + dx, y = pos.y + dy, z = pos.z - s })
         removeNode({ x = pos.x + dx, y = pos.y + dy, z = pos.z + s })
      end
   end
   for dy = -s, s do
      for dz = -s, s do
         removeNode({ x = pos.x - s, y = pos.y + dy, z = pos.z + dz })
         removeNode({ x = pos.x + s, y = pos.y + dy, z = pos.z + dz })
      end
   end
   for dz = -s, s do
      for dx = -s, s do
         removeNode({ x = pos.x + dx, y = pos.y - s, z = pos.z + dz })
         removeNode({ x = pos.x + dx, y = pos.y + s, z = pos.z + dz })
      end
   end
end
















minetest.register_node("forcefield:forcefield", {
    tiles = {"forcefield_forcefield.png"},
    drawtype = glasslike,
    sunlight_propagates = true,
    walkable = true,
    diggable = false,
    damage_per_second = 4,
    on_punch = function(pos, node, puncher)
        punch = 1
    end,
    on_construct = function(pos)
        fpos = minetest.env:find_node_near(pos, 10, "forcefield:fmaker")
        local meta1 = minetest.env:get_meta(pos)
        local meta2 = minetest.env:get_meta(fpos)
        local fgen = 1
    end,
})

minetest.register_abm({
    nodenames = {"forcefield:forcefield"},
    interval = 1,
    chance = 1,
    action = function(pos, node, active_object_count, active_object_count_wider)
        if  minetest.env:find_node_near(pos, 6, "forcefield:fmaker") == nil then
        minetest.env:add_node(pos, {name="air"})
        end
    end,
})

default.forcefield_formspec =
    "size[8,9]"..
    "list[current_name;coal;2,1;6,3;]"..
    "list[current_player;main;0,5;8,4;]"..
    "field[0,3;2,1;range;range;4]"..
    "button_exit[0,1;2,1;exit;exit]"


minetest.register_node("forcefield:fmaker", {
    description = "Forcefield Generator",
    tiles = {"forcefield_sides.png","forcefield_sides.png","forcefield_front.png","forcefield_sides.png","forcefield_sides.png","forcefield_sides.png"},
    groups = {snappy=2, choppy=2},   
    after_place_node = function(pos, placer)
        local meta = minetest.env:get_meta(pos)
        if fgens then
        table.insert (fgens  , 0)
        meta:set_string("fgen", table.getn (fgens) )
        else
        fgens = {0}
        table.insert (fgens  , 0)
        meta:set_string("fgen", table.getn (fgens))
    end
        meta:set_string("owner", placer:get_player_name() or "")
        meta:set_string("infotext", "Locked Chest (owned by "..meta:get_string("owner").."   #"..meta:get_string("fgen")..")")
    end,
    on_construct = function(pos)
        local meta = minetest.env:get_meta(pos)
        meta:set_string("formspec", default.forcefield_formspec)
        meta:set_string("infotext", "forcefield generator")
        local inv = meta:get_inventory()
        inv:set_size("coal", 18)
    end,

    can_dig = function(pos,player)
        local meta = minetest.env:get_meta(pos);
        local inv = meta:get_inventory()
        if not inv:is_empty("coal", 18) then
            return false
        end
        return true
    end,
 
})




minetest.register_abm({
    nodenames = {"forcefield:fmaker"},
    interval = 1,
    chance = 1,
    action = function(pos, node, active_object_count, active_object_count_wider)
        local meta = minetest.env:get_meta(pos)
        local inv = meta:get_inventory()
        local coallist = inv:get_list("coal")
            if inv:contains_item("coal", "default:coal_lump") then
            coalstack = inv:get_stack("coal", 1)
                    coalstack:take_item()
                    inv:set_stack("coal", 1, coalstack)
                placeCubicShell(pos, 10)
                else
                removeCubicShell(pos, 10)   
        end
            if fgens[meta:get_string("fgen")] >= 1 then
                coalstack = inv:get_stack("coal", 1)
                    coalstack:take_item()
                    inv:set_stack("coal", 1, coalstack)
                    fgens[meta:get_string("fgen")] = 0
        end

    end,
})


minetest.register_craft({
    output = 'forcefield:fmaker',
    recipe = {
        {'default:mese', 'default:mese', 'default:mese'},
        {'default:mese', 'default:furnace', 'default:mese'},
        {'default:mese', 'default:mese', 'default:mese'},
    }
})





part with taking coal is

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Code: Select all

                 coalstack = inv:get_stack("coal", 1)
                    coalstack:take_item()
                    inv:set_stack("coal", 1, coalstack)         



I need this for my forcefield mod

[ch98]

also, is it possible to save table like data after server restart?

[Traxie21]

write it to a file^

[Evergreen]

Ignore my previous question, I figured it out.

[ch98]

write it to a file^

how?

[12Me21]

Is it possible to only have one of a certain type of node generate in the entire map?

[Traxie21]

I could use some help with a timer for a HUD. I need to be able to remove one thing each second,
but I always get ERROR: Nil value, with no code indicator or anything. All variables seem valid.

HELP!

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local player = user

                local function timer(player, str)
                    if cntdown < 1 then
                        user:hud_remove(0)
                        user:hud_remove(1)
                        user:hud_remove(2)
                        user:hud_remove(3)
                    else
                        cntdown = cntdown-1
                        length1 = cntdown+str:len()
                        player:hud_change(0, number, length1*2+1)
                        local tbl = {player, str}
                        minetest.after(1, function(param)
                            timer(param.player, param.str)
                        end, tbl)               
                    end
                end
                timer(user, iname)

[RealBadAngel]

I could use some help with a timer for a HUD. I need to be able to remove one thing each second,
but I always get ERROR: Nil value, with no code indicator or anything. All variables seem valid.

HELP!

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Code: Select all

local player = user

                local function timer(player, str)
                    if cntdown < 1 then
                        user:hud_remove(0)
                        user:hud_remove(1)
                        user:hud_remove(2)
                        user:hud_remove(3)
                    else
                        cntdown = cntdown-1
                        length1 = cntdown+str:len()
                        player:hud_change(0, number, length1*2+1)
                        local tbl = {player, str}
                        minetest.after(1, function(param)
                            timer(param.player, param.str)
                        end, tbl)               
                    end
                end
                timer(user, iname)

so where is cntdown initialized?

[ShadowNinja]

write it to a file^

how?

Untested:

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Code: Select all

function save(mytable, filename)
    file, error = io.open(filename, "w")
    if error then return error end
    file:write(minetest.serialize(mytable))
    file:close()
end

function load(filename)
    file, error = io.open(filename, "r")
    if error then return error end
    local mytable = minetest.deserialize(file:read("*a"))
    file:close()
    return mytable
end

Edit: added arguments, avoided overwriting the Lua "table" table.

[BlockMen]

I could use some help with a timer for a HUD. I need to be able to remove one thing each second,
but I always get ERROR: Nil value, with no code indicator or anything. All variables seem valid.

HELP!

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Code: Select all

local max = 8 --max items to remove
local function timer(cnt, player)
    if cnt <= max then
        minetest.chat_send_all("remove hud item " .. cnt.. " from " ..player:get_player_name())  --removing
        minetest.after(1, timer, cnt+1, player)
    else
        minetest.chat_send_all("all " ..max.. "items are removed. now do want ever you want :P")       
    end
end


start the timer with

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Code: Select all

timer(0, player) --or another number

[Traxie21]

Will test blockmen.
RBA: its a local just above that code. it's usually equal to 60

[Evergreen]

Can someone fully explain the API for minetest.register_tool? The wiki article isn't complete.

[ch98]

write it to a file^

how?

Untested:

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Code: Select all

function save(mytable, filename)
    file, error = io.open(filename, "w")
    if error then return error end
    file:write(minetest.serialize(mytable))
    file:close()
end

function load(filename)
    file, error = io.open(filename, "r")
    if error then return error end
    local mytable = minetest.deserialize(file:read("*a"))
    file:close()
    return mytable
end

Edit: added arguments, avoided overwriting the Lua "table" table.

Thank you. I will try that.

[Zsoltisawesome]

Hey, How Do You Define An Entity?

[PilzAdam]

minetest.register_entity()

[prestidigitator]

Can someone fully explain the API for minetest.register_tool? The wiki article isn't complete.

For the most part minetest.register_tool behaves just like minetest.register_node. The differences need to be documented in the wiki, but until then you can look at the lua_api.txt file that comes with the game (and maybe poke around in the builtin/*.lua code a bit too).

[PilzAdam]

doc/lua-api.txt is generally the best reference you can find. Its short, precise and complete, since everything is documented there if a new feature is added.
However, some people have trouble in understanding it. Thats where the wiki with the examples is useful. But you should always first look into lua-api.txt

[ch98]

help!! keep getting this error...

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Code: Select all

23:30:09: ERROR[main]: ServerError: LuaError: error: ...orwin/.minetest/mods/minetest/geigercounter/init.lua:10: bad argument #1 to 'find_node_near' (userdata expected, got table)

but can't find the problem.

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Code: Select all

minetest.register_node("geigercounter:geiger_counter", {
    description = "Geiger Counter",
    inventory_image = "geigercounter_geigercounter.png",
    tiles = {"geigercounter_sides.png"},
    wield_image = "geigercounter_geigercounter.png",
    drawtype = normal,
    groups = {oddly_breakable_by_hand=2},
    on_use = function(itemstack, user, pointed_thing)
    local pos =  user:getpos()
    if not minetest.env:find_node_near(pos, 5, "default:nyancat_rainbow") == nil or not minetest.env.find_node_near(pos, 5, "default:nyancat") == nil then
    minetest.sound_play("10", {
    pos = pos,
    max_hear_distance = 10,
    gain = 10.0,
    })
    minetest.chat_send_player("user", "Minetest radiation level 10")
    elseif not minetest.env:find_node_near(pos, 10, "default:nyancat_rainbow") == nil or not minetest.env.find_node_near(pos, 10, "default:nyancat") == nil then
    minetest.sound_play("9", {
    pos = pos,
    max_hear_distance = 10,
    gain = 10.0,
    })
    minetest.chat_send_player("user", "Minetest radiation level 9")
    elseif not minetest.env:find_node_near(pos, 20, "default:nyancat_rainbow") == nil or not minetest.env.find_node_near(pos, 20, "default:nyancat") == nil then
    minetest.sound_play("8", {
    pos = pos,
    max_hear_distance = 10,
    gain = 10.0,
    })
    minetest.chat_send_player("user", "Minetest radiation level 8")
    elseif not minetest.env:find_node_near(pos, 30, "default:nyancat_rainbow") == nil or not minetest.env.find_node_near(pos, 30, "default:nyancat") == nil then
    minetest.sound_play("7", {
    pos = pos,
    max_hear_distance = 10,
    gain = 10.0,
    })
    minetest.chat_send_player("user", "Minetest radiation level 7")
    elseif not minetest.env:find_node_near(pos, 40, "default:nyancat_rainbow") == nil or not minetest.env.find_node_near(pos, 40, "default:nyancat") == nil then
    minetest.sound_play("6", {
    pos = pos,
    max_hear_distance = 10,
    gain = 10.0,
    })
    minetest.chat_send_player("user", "Minetest radiation level 6")
    elseif not minetest.env:find_node_near(pos, 50, "default:nyancat_rainbow") == nil or not minetest.env.find_node_near(pos, 50, "default:nyancat") == nil or not minetest.env.find_node_near(pos, 5, "default:mese") == nil then
    minetest.sound_play("5", {
    pos = pos,
    max_hear_distance = 10,
    gain = 10.0,
    })

[kaeza]

change:

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Code: Select all

minetest.env.find_node_near


to:

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Code: Select all

minetest.env:find_node_near


(note the colon ':' instead of the period '.')

Edit: It happens in line 10 and a bit below.