Post your modding questions here

[Byakuren]

l constantly get this error message: WARNING[Server]: Deprecated call to "get_entity_name
l don't know why there's just one quote in the message…
How can l get the entity name without using get_entity_name?

You can get the name from a luaentity by indexing the "name" field. E.g.

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Code: Select all

-- obj is some entity
local ent = obj:get_luaentity()
if not ent then
  -- whoops, it was a player
else
  local ent_name = ent.name
  -- code using ent_name
end


[ozkur]

can you detect if a block is being walked on?

[everamzah]

You can get the player's position, and the node in question's position, and in different ways. You might like to try ABMs to determine whether the player's position is node Y+1, or you could try a globalstep function that constantly polls the player's position, checking node below.

X-Decor's mechanisms has pressure plates that you can stand on to open doors. It uses NodeTimers.

[ozkur]

You can get the player's position, and the node in question's position, and in different ways. You might like to try ABMs to determine whether the player's position is node Y+1, or you could try a globalstep function that constantly polls the player's position, checking node below.

X-Decor's mechanisms has pressure plates that you can stand on to open doors. It uses NodeTimers.

will this lag the game? also what if it is looking for every single block of grass, sand, and snow(im making a footsteps thing)

[TumeniNodes]

A .obj does not have a collision_box.

right so... is it possible to then activate the .obj "drawtype = mesh
and then, set the entire object dimensions as "collision_box"
and then set the selection_box dimension in a small convenient location on the object?
Would that work so I can finally walk across this danged thing without falling through it?

Yes, as long as you set walkable = true in the node definition

Nope, didn't work. I tried using both nodebox and mesh... with collision_box, and selection box, with both, individually, just as a straight nodebox, etc..
Nothing seems to resolve this issue. I'm gonna set this object aside for now and continue working on a couple of other items first and then revisit this issue. I'm sure there is a fix for it but, for now I just cannot figure it out.
For a bit more of an idea, this is a 5 node x 5 node, at 4-thick object, which I want to use as a walkable platform..., but I keep falling through it. (and no, it has nothing to do with noclip setting) : )

[burli]

The player should include a function that returns the node below

[ozkur]

The player should include a function that returns the node below

which function is that?

[ph8jPf9M]

Is there a mod where if you put blocks in certain way the blocks disapear and certain mob spawns like 3 webs on top of each other to spawn spider?
If not is it possible to make it?

[ozkur]

Is there a mod where if you put blocks in certain way the blocks disapear and certain mob spawns like 3 webs on top of each other to spawn spider?
If not is it possible to make it?

like minecraft's iron golem? probably. just have a base block detect if the blocks above make the shape, or if the blocks them selves work.

[burli]

The player should include a function that returns the node below

which function is that?

Should, not "has"

Such a function should be added to the player

[Byakuren]

Is there a mod where if you put blocks in certain way the blocks disapear and certain mob spawns like 3 webs on top of each other to spawn spider?
If not is it possible to make it?

like minecraft's iron golem? probably. just have a base block detect if the blocks above make the shape, or if the blocks them selves work.

I made a mod/library for this purpose: viewtopic.php?f=11&t=14129

It's a library for matching multiblock structures, and let's you do things like "capture" which node was in certain spots, so that you can have structures that behave differently based on which nodes are used. It doesn't handle the deletion of nodes, but you can use captures to get lists of every node involved, which you could then use to remove the nodes.

EDIT: Though actually it might be overkill for your example use case, but it could help in more complicated structures.

The player should include a function that returns the node below

which function is that?

Should, not "has"

Such a function should be added to the player

The getpos method of objects can be used to write this for your own use. The player's position is at their feet, so just take their position and subtract 0.5 y-wise, and this will give you a position inside of the node below the player.

[Hybrid Dog]

+ "Byakuren"

l constantly get this error message: WARNING[Server]: Deprecated call to "get_entity_name
l don't know why there's just one quote in the message…
How can l get the entity name without using get_entity_name?

You can get the name from a luaentity by indexing the "name" field. E.g.

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

-- obj is some entity
local ent = obj:get_luaentity()
if not ent then
  -- whoops, it was a player
else
  local ent_name = ent.name
  -- code using ent_name
end


thanks

can you detect if a block is being walked on?

https://github.com/tenplus1/playerplus

[ozkur]

thanks

i don't know about how to code anything but blocks, but thanks

[KCoombes]

Ok, still can't get this work:

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Code: Select all

         for i, v in pairs (inv:get_list("src")) do
               -- Put result in "dst" list
            local dststack = inv:get_stack("dst", i)
            if inv:room_for_item("dst",cooked.item) then
            print("Adding craft result")
            dststack:add_item("dst", cooked.item)
            inv:set_stack("dst", i, dststack)
               -- take stuff from "src" list
            local srcstack = inv:get_stack("src", i)
            print("Removing "..srcstack:get_name())
            srcstack:take_item()
            inv:set_stack("src", i, srcstack)
            print (v)
            end
         end


srcstack is taken, dststack is not added

[ozkur]

how do you detect right clicks(like opening a chest)

[Byakuren]

how do you detect right clicks(like opening a chest)

Nodes can have a on_rightclick callback in their definition (https://github.com/minetest/minetest/bl ... .txt#L3659). Note that chest doesn't use this: if a node has a formspec defined in its metadata, as the chest does, right-clicking it will immediately show the formspec on the client side without asking the server first. I don't know if this bypasses the on_rightclick callback, but it might.

[ozkur]

how do you detect right clicks(like opening a chest)

Nodes can have a on_rightclick callback in their definition (https://github.com/minetest/minetest/bl ... .txt#L3659). Note that chest doesn't use this: if a node has a formspec defined in its metadata, as the chest does, right-clicking it will immediately show the formspec on the client side without asking the server first. I don't know if this bypasses the on_rightclick callback, but it might.

thanks.

[ozkur]

can the list "pos" be broken into x, y, and z coordinates?

Edit:nevermind, found out how.

how do you detect if something is in your inventory?

[kaeza]

can the list "pos" be broken into x, y, and z coordinates?

Edit:nevermind, found out how.

how do you detect if something is in your inventory?

For the first question, in case other users have the same issue, once you have a "position" table let's say `pos` (e.g. from `someobject:getpos()` or from a callback), you get the coordinates with `pos.x`, `pos.y`, and `pos.z`. The vector math functions (see `lua_api.txt`) can be used on these tables.

For your second question, you have to have a reference to the inventory (let's say `inv`), then you do something like this:

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Code: Select all

local inv = get_inventory_from_somewhere()
if inv:contains_item("main", ItemStack("default:dirt 42")) then
  -- do something here
end


Replace "main" with the inventory list name. "main" is generally used for the main list, e.g. the player inventory, chest contents. Other known lists are "craft" (for the player crafting grid), "craftresult" (guess what).

Also, replace the "default:dirt 42" with the (internal) name and count of the item you're looking for. You may omit the `42` if you are just looking for the item (implicit count of 1). Don't recall if groups work here.

[ozkur]

thanks.

[KCoombes]

Seriously having issues with inventory manipulation. My on_punch code is causing crash to desktop, with the debug.txt looking like this:

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Code: Select all

2016-08-03 14:35:35: INFO[Main]: GenericCAO: Got init data
2016-08-03 14:35:35: INFO[Main]: ClientEnvironment::addActiveObject(): added (id=1)
2016-08-03 14:35:35: INFO[Main]: GenericCAO::addToScene(): mesh
2016-08-03 14:35:35: INFO[Main]: Irrlicht: Loaded mesh: character.b3d
2016-08-03 14:35:35: INFO[Main]: GenericCAO::addToScene(): mesh
2016-08-03 14:35:35: INFO[Main]: Irrlicht: Loaded mesh: character.b3d
2016-08-03 14:35:35: INFO[Main]: Pointing at [node under=5,5,32 above=6,5,32]
2016-08-03 14:35:38: INFO[Main]: Client: avg_rtt=0.015
2016-08-03 14:35:38: INFO[Main]: Selected item: 0x22f166
2016-08-03 14:35:38: INFO[Main]: Ground right-clicked
2016-08-03 14:35:38: INFO[Main]: Launching custom inventory view
2016-08-03 14:35:38: INFO[Main]: Lazily creating item texture and mesh for "default:stick"
2016-08-03 14:35:40: INFO[Main]: Started digging
2016-08-03 14:35:40: VERBOSE[Server]: TOSERVER_INTERACT: action=0, item=2, pointed=[node under=5,5,32 above=6,5,32]
2016-08-03 14:35:40: VERBOSE[Main]: OpenALSoundManager::maintain(): 0 playing sounds, 49 sound names loaded
2016-08-03 14:35:40: INFO[Main]: Left button released (stopped digging)

[ozkur]

i am having trouble with the get_node() command:

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Code: Select all

minetest.register_node("rocket:pad", {
    description = "Launch Pad",
    tiles = {"pad.png"},
    groups = {cracky=1},
  })

minetest.register_node("rocket:engine", {
    description = "Rocket Engine",
    tiles = {"pad.png", "enginebottom.png",
      "engineside.png"},
    groups = {cracky=1},
  })


minetest.register_node("rocket:tankfull", {
    description = "Fuel Tank(full)",
    tiles = {"pad.png", "pad.png", "tankfull.png"},
    groups = {cracky=1},
})

minetest.register_node("rocket:pod", {
    description = " Rocket Control Pod",
    tiles = {"top.png", "pad.png", "pod.png"},
    groups = {cracky = 1},
    on_punch = function(pos,node,player,pointed_thing)
      tank = minetest.get_node({pos.x, pos.y-1, pos.z})
      engine = minetest.get_node({pos.x, pos.y-2, pos.z})
      pad = minetest.get_node({pos.x, pos.y-3, pos.z})
      if tank == "rocket:tank" and engine == "rocket:engine" and pad == "rocket:pad" then
        --player:get_pos(p)
        --player:set_pos({p.x, 25000, p.z})
        --player:set_physics_override(1, 1, 0.17)
        --player:set_sky({0, 0, 0}, "skybox"})
        --minetest.remove_node({pos.x, pos.y-1, pos.z})
        --minetest.remove_node({pos.x, pos.y-2, pos.z})
        --minetest.remove_node(pos)
        minetest.chat_send_all("Hello World!")
      end
    end
})

when you punch the command pod, nothing happens(other than it starts digging)

[ozkur]

This code works, kinda - the 'dst' is 3x3, while the code reads only the first slot - how can I make it read all the slots?

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Code: Select all

      if inv:is_empty("src") then
         minetest.chat_send_player(name,"It is empty!")
      elseif not inv:is_empty("dst") then
         minetest.chat_send_player(name,"It is full!")
      end


as long as it's not empty (so could be half full, or just have one item,) it would say "full"

not empty is'nt always full

[zorman2000]

Hello,

I'm new to Minetest modding (and Lua as well). I'm trying to make some kind of coin pay system. I want to subtract items from an item stack when a payment is done, however I'm unable to do so. This is my code:

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Code: Select all

local stack = clicker:get_wielded_item()
-- Other stuff
   if stack then
      if tonumber(stack_amount) >= tonumber(coin_amount) and stack_name == coin_item_name then
          local payed_stack = stack:take_item(coin_amount)
          clicker:set_wielded_item(stack)
          -- Other stuff
      end


I have tried doing stack:replace(), stack:set_count() and others without success... any ideas? I have printed the contents of the stack and they are modified correctly, but it doesn't replaces the user item...

Thanks,
zorman2000

[ozkur]

Hello,

I'm new to Minetest modding (and Lua as well). I'm trying to make some kind of coin pay system. I want to subtract items from an item stack when a payment is done, however I'm unable to do so. This is my code:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

local stack = clicker:get_wielded_item()
-- Other stuff
   if stack then
      if tonumber(stack_amount) >= tonumber(coin_amount) and stack_name == coin_item_name then
          local payed_stack = stack:take_item(coin_amount)
          clicker:set_wielded_item(stack)
          -- Other stuff
      end


I have tried doing stack:replace(), stack:set_count() and others without success... any ideas? I have printed the contents of the stack and they are modified correctly, but it doesn't replaces the user item...

Thanks,
zorman2000

are both variables actually named tonumber?

[zorman2000]

are both variables actually named tonumber?

No, that is just to ensure that I'm comparing int to int. The "if" condition is not the problem, it enters the If and if I print the contents of "stack" and "payed_stack" they are correct. The problem is that I'm unable to replace the player's current stack with the edited "stack".

[Nicotine]

lol nvm, I got it. In my personal defense - I haven't slept last night and it's nearly 1AM already. This post can be deleted.

Topic: Why can't I save data from my table?
Reason: It is my deepest desire to create a modification for this fine game.
More Info: My code's here: http://pastebin.com/LXZULM99
I know the code sucks, I'm a newcomer to lua. P:
The mod saves fine when there's just one player in the table, but any more and it throws a temper tantrum in the terminal.

Saving data...
Saving data for player Nicotine...
Saving data...
Saving data for player
...
2016-08-03 23:49:52: ERROR[main]: UNRECOVERABLE error occurred. Stopping server. Please fix the following error:
2016-08-03 23:49:52: ERROR[main]: Runtime error from mod 'invplus_test' in callback environment_Step(): /home/oem/.minetest/mods/invplus_test/init.lua:101: attempt to concatenate field 'exp' (a nil value)
2016-08-03 23:49:52: ERROR[main]: stack traceback:
2016-08-03 23:49:52: ERROR[main]: /home/oem/.minetest/mods/invplus_test/init.lua:101: in function </home/oem/.minetest/mods/invplus_test/init.lua:90>
2016-08-03 23:49:52: ERROR[main]: /usr/share/games/minetest/builtin/game/register.lua:355: in function </usr/share/games/minetest/builtin/game/register.lua:335>

In thread 7fdd9c31e780:
/build/minetest-6sh_iU/minetest-0.4.13+repack/src/server.cpp:511: void Server::step(float): A fatal error occurred: Runtime error from mod 'invplus_test' in callback environment_Step(): /home/oem/.minetest/mods/invplus_test/init.lua:101: attempt to concatenate field 'exp' (a nil value)
stack traceback:
/home/oem/.minetest/mods/invplus_test/init.lua:101: in function </home/oem/.minetest/mods/invplus_test/init.lua:90>
/usr/share/games/minetest/builtin/game/register.lua:355: in function </usr/share/games/minetest/builtin/game/register.lua:335>
Debug stacks:
DEBUG STACK FOR THREAD 7fdd62ffd700:
#0 virtual void* EmergeThread::Thread()
#1 virtual MapBlock* ServerMap::emergeBlock(v3s16, bool): p=(-12,2,-8), create_blank=0
#2 MapBlock* ServerMap::loadBlock(v3s16)
#3 void ServerMap::loadBlock(std::__cxx11::string*, v3s16, MapSector*, bool)
DEBUG STACK FOR THREAD 7fdd63fff700:
#0 virtual void* UpdateThread::Thread()
DEBUG STACK FOR THREAD 7fdd790fa700:
#0 virtual void* UpdateThread::Thread()
DEBUG STACK FOR THREAD 7fdd7bffe700:
#0 virtual void* ServerThread::Thread()
#1 void Server::AsyncRunStep(bool)
(Leftover data: #2 virtual void ServerEnvironment::step(float))
(Leftover data: #3 void RemoteClient::GetNextBlocks(ServerEnvironment*, EmergeManager*, float, std::vector<PrioritySortedBlockTransfer>&))
(Leftover data: #4 void Server::UpdateCrafting(Player*))
(Leftover data: #5 bool getCraftingResult(Inventory*, ItemStack&, std::vector<ItemStack>&, bool, IGameDef*))
DEBUG STACK FOR THREAD 7fdd9c31e780:
#0 int main(int, char**)
#1 void Server::step(float)
(Leftover data: #2 virtual void ClientEnvironment::step(float))
(Leftover data: #3 void Client::Receive())
(Leftover data: #4 void Client::ProcessData(NetworkPacket*))
(Leftover data: #5 void MeshUpdateQueue::addBlock(v3s16, MeshMakeData*, bool, bool))
Przerwane (zrzut pamięci)

[paramat]

ozkur

Topic: Can you build high enough to have your blocks not cast shadows??
Reason: I want to make another dimesion(and possibly more than just one). I'm hoping to stack one on top the other, but i don't know how high or even if i can do so.

I added a bool to luavoxelmanip exactly for this use https://github.com/minetest/minetest/blob/master/doc/lua_api.txt#L3176
if you are generating realms you will already be using the luavoxelmanip.
Set the bool to false in a single layer of mapchunks that is a little way below the base of an upper realm.

Yes you can stack lua mapgen realms all the way to y = 31000.

For footprints see my 'trail' mod or my 'moonrealm' mod.

[Hybrid Dog]

What is the meaning of the day night table for set_lighting?

[ozkur]

ozkur

Topic: Can you build high enough to have your blocks not cast shadows??
Reason: I want to make another dimesion(and possibly more than just one). I'm hoping to stack one on top the other, but i don't know how high or even if i can do so.

I added a bool to luavoxelmanip exactly for this use https://github.com/minetest/minetest/blob/master/doc/lua_api.txt#L3176
if you are generating realms you will already be using the luavoxelmanip.
Set the bool to false in a single layer of mapchunks that is a little way below the base of an upper realm.

Yes you can stack lua mapgen realms all the way to y = 31000.

For footprints see my 'trail' mod or my 'moonrealm' mod.

thanks!