Post your modding questions here

[kaeza]

I tried to do something with minetest.register_on_joinplayer:

minetest.register_on_joinplayer(function(player)
print("hello")
minetest.env:place_node(player:getpos(),{name="default:stone"})

end)

is correctly printed "hello",but the node is not placed
What's wrong?

For some reason, there are some things you can't do from this callback (at least when playing singleplayer).
A quick workaround would be:

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Code: Select all

minetest.register_on_joinplayer(function(player)
  print("hello")
  minetest.after(0.1, function()
    minetest.env:place_node(player:getpos(),{name="default:stone"})
  end)
end)


Edit: I think it may be because the player has not "emerged" yet, but not sure. See what happens if you change print("hello") to print(dump(player:getpos()))

[pandaro]

kaeza thanks for your interest, I tried to call "player: GetPos ()" and the output is correct;
I tried, like you said, to call "place_node" after a bit of time but it still does not work.
Does anyone else have any ideas?

[BlockMen]

kaeza thanks for your interest, I tried to call "player: GetPos ()" and the output is correct;
I tried, like you said, to call "place_node" after a bit of time but it still does not work.
Does anyone else have any ideas?

I dont know why, but it works if you use "set_node()" instead of "place_node()"

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Code: Select all

minetest.register_on_joinplayer(function(player)
  print("hello")
  minetest.after(0.1, function()
    minetest.env:set_node(player:getpos(),{name="default:stone"})
  end)
end)


[1244]

Can I transfer metadata between nodes? For example I have got node "a" which have metadata "x" and I have node "b" which have metadata "x". Can I transfer "x" from node "a" to node "b"?

[Nore]

Use that:

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Code: Select all

function copy_meta(pos1,pos2)
    local meta1 = minetest.env:get_meta(pos1)
    local meta = meta:to_table()
    local meta2 = minetest.env:get_meta(pos2)
    meta2:from_table(meta)
end

[Excalibur Zero]

Topic: How to create mob member at block?
Reason: I want to make a mod with a block that can be used to summon an enemy, and once it does so the block destroys its self.
More Info: I've tried to do it, but I couldn't figure it out.

[jojoa1997]

How would I make a tool do two functions using on_place

[Traxie21]

How would I make a tool do two functions using on_place

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Code: Select all

on_place = function(ARGS)
function1()

function2()
end

@ExcaliburZero: I know how, but I'm on a kindle and don't remember exactly.
Also, nice of you to read the first post and use correct formatting :3

[Casimir]

no I mean like only generating one mese block in the entire map

Look at the spawn of Minetest-Black.

That's what I came up with. The chanse to generate the node is very high, so it will be generated at the start of the world (that's what I want in this case).
There is the problem that the node can be removed by cavegen. I might have to use minetest.after, but that seems ugly to me.

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Code: Select all

minetest.register_on_generated(function(minp, maxp, seed)
    local file = io.open(minetest.get_worldpath().."/wcc.txt", "r")
    if file then
        return
    end
    if maxp.y >= 2 and minp.y <= 0 then
    local pr = PseudoRandom(seed+1)
        local x = pr:next(minp.x, maxp.x)
        local z = pr:next(minp.z, maxp.z)
        -- Find ground level (0...15)
        local ground_y = nil
        for y=30,0,-1 do
            if minetest.env:get_node({x=x,y=y,z=z}).name ~= "air"
            and minetest.env:get_node({x=x,y=y,z=z}).name ~= "default:leaves"
            and minetest.env:get_node({x=x,y=y,z=z}).name ~= "default:jungleleaves" then
                ground_y = y
                break
            end
        end
   
        if ground_y then
            local p = {x=x,y=ground_y+1,z=z}
            local nn = minetest.env:get_node(p).name
            local nn_ground = minetest.env:get_node({x=x,y=ground_y,z=z}).name
            -- Check if the node can be replaced
            if minetest.registered_nodes[nn] and
            minetest.registered_nodes[nn].buildable_to and
            minetest.registered_nodes[nn_ground].walkable and
            nn_ground ~= "ignore" then
                minetest.env:set_node(p,{name="wcc:wcc"})
                local file = io.open(minetest.get_worldpath().."/wcc.txt", "w")
                file:write(minetest.pos_to_string(p))
                file:close()
                print("[wcc] !")
            end
        end
    end
end)


[Excalibur Zero]

Topic: How to create mob member at block?
Reason: I want to make a mod with a block that can be used to summon an enemy, and once it does so the block destroys its self.
More Info: I've tried to do it, but I couldn't figure it out.

I figured out how to do something like I wanted, where it creates an item which creates an enemy where it would be placed. I found the code in PilzAdam's mob mod. I'll add it here so that others can find it.

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Code: Select all

minetest.register_craftitem("mobs:rat", {
    description = "Rat",
    inventory_image = "mobs_rat_inventory.png",
   
    on_place = function(itemstack, placer, pointed_thing)
        if pointed_thing.above then
            minetest.env:add_entity(pointed_thing.above, "mobs:rat")
            itemstack:take_item()
        end
        return itemstack
    end,
})


[12Me21]

This seems like a stupid question with an obvious answer, but how do you make it so an abm will happen if a node is next to one type of node AND another type, like having an abm happen when a dirt block is next to a stone block AND a water source?

[ShadowNinja]

This seems like a stupid question with an obvious answer, but how do you make it so an abm will happen if a node is next to one type of node AND another type, like having an abm happen when a dirt block is next to a stone block AND a water source?

Use find_nodes_in_area() and check the result.

[pandaro]

some questions about armor_groups:
as always I have some difficulty ...
I try to fully understand the damage system.

I tried to give a armor_groups like this:

"player: set_armor_groups ({fleshy = 1})"

this does not return any errors, GOOD, but...
if I hit the player with any sword, the player receives no damage: for the sword of wood, stone, iron, diamond. NO damage.
Then try to return the player to a level of 0 armor:

"player: set_armor_groups ({fleshy = 0})"

trying to hit him with a sword sword of wood, stone, iron, diamond get NO damage.
So I try to figure out what the armor level through:

"print (dump (player: get_armor_groups ()))"

But Minetest crashes and returns:
attempt to call method 'get_armor_groups' (a nil value)

The main question is:
how to handle armor_groups?
secondary question:
you can create alternative groups of damage? for example: phisical damage or elemental damage?

Thanks to anyone who can answer me

[deivan]

Is the percentage of the damage received no? Like 0 = 0% and 50 = 50%, correct?

[PilzAdam]

Is the percentage of the damage received no? Like 0 = 0% and 50 = 50%, correct?

Yep.

[1244]

In which way I can get itemstack which player hold in hand?

[PilzAdam]

In which way I can get itemstack which player hold in hand?

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Code: Select all

player:get_wielded_item()

[12Me21]

How do you make it so if there is a certain item in a node's formspec, something will happen?
Example: if you put a music disk in a chest it will play a sound

[kaeza]

How do you make it so if there is a certain item in a node's formspec, something will happen?
Example: if you put a music disk in a chest it will play a sound

One way would be to override the node's on_metadata_inventory_put callback.
See here.

[12Me21]

How do you make it so if there is a certain item in a node's formspec, something will happen?
Example: if you put a music disk in a chest it will play a sound

One way would be to override the node's on_metadata_inventory_put callback.
See here.

So I would do

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player),
if stack == "music:disk" then
minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25})
end

(I've never done anything with formspecs, so this is probably completely wrong)

[PilzAdam]

How do you make it so if there is a certain item in a node's formspec, something will happen?
Example: if you put a music disk in a chest it will play a sound

One way would be to override the node's on_metadata_inventory_put callback.
See here.

So I would do

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player),
if stack == "music:disk" then
minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25})
end

(I've never done anything with formspecs, so this is probably completely wrong)

1.) There is a Lua syntax error
2.) Fix your indentation.
3.) This sound will be played locationless
4.) "stack" is a object of the type ItemStack (see lua-api.txt).

[12Me21]

how about this?

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Code: Select all

    on_metadata_inventory_put = function(pos, node, listname, index, stack, player)
    if inv:contains_item("music:disk") then
        minetest.sound_play("music.ogg", {gain = 0.5, max_hear_distance = 25})
        end
   
    end,

EDIT: I tried it and it still won't work. It says:

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Code: Select all

18:09:37: ERROR[main]: ServerError: LuaError: error: ...netest-0.4.6\bin\..\mods\minetest\music\init.lua:37: attempt to index global 'inv' (a nil value)
18:09:37: ERROR[main]: stack traceback:
18:09:37: ERROR[main]: InventoryMenu: The selected inventory location "nodemeta:-449,3,467" doesn't exist
In trans_func.
Access violation at 5474754F write?=8 address=1416918351
18:09:37: ERROR[main]: Some exception: "Access violation"
In trans_func.
Access violation at 00EB1AF8 write?=8 address=15407864
18:09:37: ERROR[main]: ERROR: An unhandled exception occurred: Access violation

[12Me21]

One way would be to override the node's on_metadata_inventory_put callback.
See here.

So I would do

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player),
if stack == "music:disk" then
minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25})
end

(I've never done anything with formspecs, so this is probably completely wrong)

1.) There is a Lua syntax error
2.) Fix your indentation.
3.) This sound will be played locationless
4.) "stack" is a object of the type ItemStack (see lua-api.txt).

1.) "I've never done anything with formspecs, so this is probably completely wrong"
2.) I'll fix that if the mod ever works
3.) I'll fix that if the mod ever works
4.) ok

[12Me21]

Someone please help!

[deivan]

The moving (or running) light mode have a similar code, I think. Try read the code of this mode.
The mode who make you have light in the same place of you are if you have a torch in your hand.

[12Me21]

Is it possible to make entities partially transparent?

[12Me22]

My partner 12Me21 and I don't know a lot about this type of coding. Can you guide us with more details?
What syntax error, what is the proper indentation?

Thanks,

One way would be to override the node's on_metadata_inventory_put callback.
See here.

So I would do

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

on_metadata_inventory_put = function(pos, listname, index, stack, player),
if stack == "music:disk" then
minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25})
end

(I've never done anything with formspecs, so this is probably completely wrong)

1.) There is a Lua syntax error
2.) Fix your indentation.
3.) This sound will be played locationless
4.) "stack" is a object of the type ItemStack (see lua-api.txt).

[PilzAdam]

My partner 12Me21 and I don't know a lot about this type of coding. Can you guide us with more details?
What syntax error, what is the proper indentation?

Thanks,

So I would do

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player),
if stack == "music:disk" then
minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25})
end

(I've never done anything with formspecs, so this is probably completely wrong)

1.) There is a Lua syntax error
2.) Fix your indentation.
3.) This sound will be played locationless
4.) "stack" is a object of the type ItemStack (see lua-api.txt).

For proper indentation read a tutorial about coding (the language doesnt matter).
There are several syntax errors, here is the fixed code.

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player)
    if stack == "music:disk" then
        minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25})
    end
end,


To play the sound at a position, just specify the pos field in the sound parameter table, like:

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player)
    if stack == "music:disk" then
        minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25, pos=pos})
    end
end,


Note that only mono channel sound files can be played at a position. Also only ogg files are supported.
To get the name of a ItemStack, use get_name():

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Code: Select all

on_metadata_inventory_put = function(pos, listname, index, stack, player)
    if stack:get_name() == "music:disk" then
        minetest.sound_play("song.ogg", {gain = 0.5, max_hear_distance = 25, pos=pos})
    end
end,


[Dan Duncombe]

I would strongly recommend using the free downloadable Notepad++ designed for coding, however if you don't want to do that you can use Window's Wordpad text editor, if you want to save a file as LUA in wordpad, you need to call it (name of file) .lua

question: what program do you recommend to make a mod with?
reason: I wanna try to make mods. :)
more info: i'm using windows 7.

[Calinou]

I would strongly recommend using the free downloadable Notepad++ designed for coding

+1, it's a pretty good editor for Windows, it's also very fast to start.

however if you don't want to do that you can use Window's Wordpad text editor, if you want to save a file as LUA in wordpad, you need to call it (name of file)

Don't do that. No, really, you'll regret it. 8)