Post your modding questions here

[pandaro]

I need to execute a function when I put an item in the first row of the inventory of the player. Inventory of reference should be current_player, main. So I should redefine the function on_put () for inventory, "current_player"

is this possible?

You might look into the "flashlight" node/tool of the technic mod:
https://github.com/minetest-technic/tec ... hlight.lua

I do not think that's what I try. I have to run a function when a player put an item in the first row of the inventory. I do not want to use a "globalstep" because it is computationally exaggerated.


Then I still try to change "on_put" of the inventory of the player.
I discovered that through minetest.get_inventory ("player", "name_of_the_player")I can get a reference.
At this point can i change "on_put" for this player? or even for all players?

[MrElmux]

How do i register an inventory for an Entity (To access it via get_inventory)

[yaman]

Is it possible to spawn an ore in the air because wherein = "default:air", doesn't seem to work

[kaeza]

Is it possible to spawn an ore in the air because wherein = "default:air", doesn't seem to work

The node name for air is "air", not "default:air". See if that works.

[yaman]

Is it possible to spawn an ore in the air because wherein = "default:air", doesn't seem to work

The node name for air is "air", not "default:air". See if that works.

It worked, thanks. Another question: is it possible to spawn something that isn't random, like a house or somethin, and how?

[yaman]

How do you make something that can't be placed on the ground, like a lump? I need it to make something for my mod.

[Krock]

How do you make something that can't be placed on the ground, like a lump? I need it to make something for my mod.

Code: Select all

minetest.register_craftitem("default:coal_lump", {
    description = "Coal Lump",
    inventory_image = "default_coal_lump.png",
})

Those things are called items.
EDIT: mo-hahah I was first!

[Casimir]

minetest.register_craftitem(name, item definition)
The item definition is almost the same. You can read more in the lua_api.txt
edit: Krock was faster

[yaman]

inventory_image = "default_coal_lump.png",

minetest.register_craftitem(name, item definition)
The item definition is almost the same. You can read more in the lua_api.txt
edit: Krock was faster

Thanks, to both of you

[Krock]

Topic: Converting virtual money into... virtual money
Reason: I try but I've no itea how to make something like a "exchange rate"
More info: Well, I've a mod which gives money as items, but there are also other currencies like "money", those use non-touchable-money.

I planned to make something like an change block for the money mod any my mod-with-item-currency but I've no idea how I should make the formula for the exchange rate.

This is advanced but I'd be very thankful about that help.

[Krock]

Okay, an easier question now:

When I've a configuration file in the worldpath, how can I set a variable in it with LUA?

[Pitriss]

Okay, an easier question now:

When I've a configuration file in the worldpath, how can I set a variable in it with LUA?

Variable: https://github.com/minetest/minetest/bl ... .txt#L1869

Data structures are easier.. you just put them into table and serialize them by minetest.serialize and write them into file.

[fairiestoy]

Okay, an easier question now:

When I've a configuration file in the worldpath, how can I set a variable in it with LUA?

you could use os.execute for a compiled c program which can do this

Settings: An interface to read config files in the format of minetest.conf
- Can be created via Settings(filename)
methods:
- get(key) -> value
- get_bool(key) -> boolean
- set(key, value)
- remove(key) -> success
- get_names() -> {key1,...}
- write() -> success
^ write changes to file
- to_table() -> {[key1]=value1,...}

^^^^^^^ ??

Topic: Converting virtual money into... virtual money
Reason: I try but I've no itea how to make something like a "exchange rate"
More info: Well, I've a mod which gives money as items, but there are also other currencies like "money", those use non-touchable-money.

I planned to make something like an change block for the money mod any my mod-with-item-currency but I've no idea how I should make the formula for the exchange rate.

This is advanced but I'd be very thankful about that help.

Why not making it configurable? Choose an initial exchange rate but refer to your code in order to make it changeable by the admin ( which would fit your needs about the configuration file ). Maybe with a extra option to add changes within this rate by time or by conversion amount ( the landrush way ).

Edit:
Hell, Pitriss x) Same thoughts it seems

[prestidigitator]

I do not think that's what I try. I have to run a function when a player put an item in the first row of the inventory. I do not want to use a "globalstep" because it is computationally exaggerated.

What I do is use the global step or (probably better) repeated uses of minetest.after. With the global step, do something like this to avoid large amounts of redundant computation:

Code: Select all

local DURATION = 1.0;
local timer = 0.0;

minetest.register_globalstep(
   function(dtime)
      timer = timer + dtime;
      if timer < DURATION then return end
      timer = timer - DURATION;

      -- Your logic
   end);

With the other solution, it'll look something more like:

Code: Select all

local DURATION = 1.0;

local function myFunction()
   minetest.after(DURATION, myFunction);

   -- Your logic
end

-- Boostrap it
minetest.after(DURATION, myFunction);

Then I still try to change "on_put" of the inventory of the player.
I discovered that through minetest.get_inventory ("player", "name_of_the_player")I can get a reference.
At this point can i change "on_put" for this player? or even for all players?

Unfortunately you can't do this with a player's (normal) inventory; only a node and a detached inventory. I've proposed unifying the inventory callback API in the past, but I guess it's not on the priority list of any approved developer.

[pandaro]

many thanks prestidigitator will evaluate your suggestions

[prestidigitator]

How do i register an inventory for an Entity (To access it via get_inventory)

Entities do not have inventory. You can essentially create one by keeping a table of ItemStack objects in the entity object itself. You could even create a "class" that gives such a virtual inventory the same API as a full standard inventory.

Another option would be to create a unique name for each entity instance and use it to create a detached inventory associated with the entity. In this case you'd want to be really careful about "memory leaks" though. I haven't played with using metatables on entities, but theoretically you could use this to install a Lua finalizer to take care of cleanup.

Either way you'd want to also manage entity static data carefully if persisting the inventory contents is important. The engine is only going to persist node and player inventory data for you, so if you want other kinds of inventory you are pretty much on your own.

[wcwyes]

how would I add an extra function to a special pick axe? like if I mine something from pos then do function?

[philipbenr]

When using after_place_node, can I determine the direction in which a certain node is placed? (ex, facedir)

Not like this:





But like so:

[prestidigitator]

When using after_place_node, can I determine the direction in which a certain node is placed? (ex, facedir

I believe the node's 'param2' value determines the direction it faces, but it may depend on the node's drawtype and other considerations. I believe 'param2' is set automatically for nodes a player places directly from inventory (for some types of node?), but you will probably have to set it explicitly if adding the node from Lua code.

[prestidigitator]

how would I add an extra function to a special pick axe? like if I mine something from pos then do function?

Oddly, there's not a lot of customization you can do for the behavior from the tool's end. You can either completely override what it does by adding an on_use() callback (same for tools as for nodes), or you're pretty much stuck with what it does using the default Minetest behavior. [EDIT: I stand corrected. See Nore's post below. Excellent!] You can set parameters for the latter to customize the damage it does, how quickly it digs various types of block, what materials it can affect, etc., but you can't just do arbitrary things. If you make your own on_use() method, you'll have to figure out every detail of what happens when you left-click with it; the default behavior for digging and damage and all of that does not take effect, instead being replaced with whatever your callback does.

From the receiving end—meaning a node or entity on which a tool is being used—you have a few more options. So if there's some special entity/mob/node (but not player) you want the tool to affect in a particular way, there are a number of options to play with. For example, there are the on_punch(), on_dig(), can_dig(), after_dig_node(), and on_rightclick() callbacks on nodes and the punch() and right_click() callbacks on entites. From most of these you either get the wielded item as a parameter or get a reference to the player doing the digging/clicking and can use the player API to test things like what tool they are wielding.

It may be possible to re-create enough of the default behavior of digging/hitting if you dig around in the built-in Lua code a bit to figure out what everything is doing, but you'll have to be pretty careful to do it in a way that will work nicely with other mods (because of the way they assume it is all going to work).

[Nore]

how would I add an extra function to a special pick axe? like if I mine something from pos then do function?

Oddly, there's not a lot of customization you can do for the behavior from the tool's end. You can either completely override what it does by adding an on_use() callback (same for tools as for nodes), or you're pretty much stuck with what it does using the default Minetest behavior.

Wrong: there is the after_use callback in the API now: https://github.com/minetest/minetest/bl ... .txt#L2106

[Krock]

Thanks for all helpers with that saving question.
I used the "io.open("file", "w")" function for now but other timer, it will be better using another way

[wcwyes]

sweet thnx

how would I add an extra function to a special pick axe? like if I mine something from pos then do function?

Oddly, there's not a lot of customization you can do for the behavior from the tool's end. You can either completely override what it does by adding an on_use() callback (same for tools as for nodes), or you're pretty much stuck with what it does using the default Minetest behavior.

Wrong: there is the after_use callback in the API now:

Code: Select all

https://github.com/minetest/minetest/blob/master/doc/lua_api.txt#L2106

[philipbenr]

When using after_place_node, can I determine the direction in which a certain node is placed? (ex, facedir

I believe the node's 'param2' value determines the direction it faces, but it may depend on the node's drawtype and other considerations. I believe 'param2' is set automatically for nodes a player places directly from inventory (for some types of node?), but you will probably have to set it explicitly if adding the node from Lua code.

That's not quite what I meant. I know how to do so, but I need to be able to set the facing position inside the callback after_place_node.

[shaheerziya]

how to make a mod?