Post your modding questions here

[pandaro]

how to manipulate images through lua?

[prestidigitator]

Actual manipulation of images may not be possible. For example, I don't think you can get a pixel array and set pixels or draw arbitrary shapes. However, in places you are asked for a texture name, you may be able to do some simple manipulations using a custom Minetest texture specification language in place of a simple filename.

[1244]

In which way I can add meta float from node to formspec this node? Example:

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Code: Select all

x_formspec =
"invsize[8,9;]"..
"label[1,3;Variable_from_node]"

minetest.register_node("X:x", {
local Variable_from_node = 10
})


In which way I can do this?

[kaeza]

In which way I can add meta float from node to formspec this node? Example:

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Code: Select all

x_formspec =
"invsize[8,9;]"..
"label[1,3;Variable_from_node]"

minetest.register_node("X:x", {
local Variable_from_node = 10
})


In which way I can do this?

I think you can do something like this:

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Code: Select all

"label[1,3;$(Variable_from_node)]"


Also, the 'local' inside the table is wrong; remove it.

[10twenty4]

I'm trying to remove whatever you're holding onto when you punch a node. I'm not seeing any change occur, however. Should I be using something besides take_item()?

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Code: Select all

on_punch = function(pos, node, puncher)
            wield = puncher:get_wielded_item()
            print(wield: get_count())
            wield:take_item()
            print(wield: get_count())
            end


edit: scratch that, I fixed it by adding puncher: set_wielded_item(wield)

[prestidigitator]

Calling "take_item()" will change the local ItemStack you have in your function there, but the API actually passes ItemStacks around by value (copies) rather than by reference. So you have to tell the API to do something with the modified ItemStack. For example, you could pass it back to ObjectRef:set_wielded_item(...).

[10twenty4]

I'm trying to create a menu when you right click a node. I believe I'm doing this correctly (adding a formspec to the metadata), but nothing happens. I've tried copying the line from the furnace code and other examples, but that doesn't work either. I'm assuming I'm missing something, but I don't know what.

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Code: Select all

on_construct= function(pos)
        local meta = minetest.env:get_meta(pos)
        meta:set_string("formspec",
                "size[8,9]"..
        "list[current_name;fuel;2,3;1,1;]"..
        "list[current_player;main;0,5;8,4]"
        )
        meta:set_string("infotext", "Campfire")
        local inv = meta:get_inventory()
        inv:set_size("fuel",1)

    end,

[Evergreen]

I'm trying to create a menu when you right click a node. I believe I'm doing this correctly (adding a formspec to the metadata), but nothing happens. I've tried copying the line from the furnace code and other examples, but that doesn't work either. I'm assuming I'm missing something, but I don't know what.

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Code: Select all

on_construct= function(pos)
        local meta = minetest.env:get_meta(pos)
        meta:set_string("formspec",
                "size[8,9]"..
        "list[current_name;fuel;2,3;1,1;]"..
        "list[current_player;main;0,5;8,4]"
        )
        meta:set_string("infotext", "Campfire")
        local inv = meta:get_inventory()
        inv:set_size("fuel",1)

    end,

Exactly what I was going to ask.

[10twenty4]

This time, I'm trying to have a craftitem decrement by one when used on a node.

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Code: Select all

on_use = function(itemstack, user, pointed_thing)
            if pointed_thing.type == "node" then
                itemstack: take_item()
                user:set_wielded_item(itemstack)
            end
        end
    })

I've done a bit of testing, and it appears that while user's wielded item is decremented, user is a different object from the player, so the player's inventory is unaffected. Can you recommend a way around that?

edit: nvrmind, I just released I can use return itemstack

[prestidigitator]

If the formspec is badly formed, nothing happens. Silent failure. And unfortunately the documentation for formspecs is a little inconsistent and wrong. I believe you'll need a semicolon at the name of the player's list, just like the node inventory's list.

[pandaro]

There is already a way to check for a collision between two objects?

[Sokomine]

Ask sapier. AFAIK he was working on something like that or at least knows where to look. Perhaps a patch is even linked in the mobf-thread. The mobf mobs do at least detect collusion with ground/nodes even without that patch.

[pandaro]

thanks for now!

[Likwid H-Craft]

I am try make a info box show a node/item/block in a menu so how do I make it work plus I like it have text here code.


[lua]
minetest.register_node("ibox:info_box", {
description = "Info Box",
tiles = {"ibox_info_box.png"},
is_ground_content = true,
groups = {cracky=3,fleshy=2},
drop = 'default:bookshelf 7', 'default:mese_crystal_fragment 2',
on_construct = function(pos)
--local n = minetest.env:get_node(pos)
local meta = minetest.env:get_meta(pos)
meta:set_string("formspec", "field[text;;${text}]")
meta:set_string("infotext", "\"\"")
end,
on_receive_fields = function(pos, formname, fields, sender)
--print("Sign at "..minetest.pos_to_string(pos).." got "..dump(fields))
local meta = minetest.env:get_meta(pos)
fields.text = fields.text or ""
print((sender:get_player_name() or "").. wrote \""..fields.text..
"\" to sign at "..minetest.pos_to_string(pos))
meta:set_string("text", fields.text)
meta:set_string("infotext", '"'..fields.text..'"')
end,
})
[/lua]

I edit made the color text so make it just like, as if it the real deal :) and you don't know how long it took me, to edit the text have the right color...

Oh and, How I make the block drop 2 thing not one.

[bentleysb]

I am trying to make it so when a block is placed then 2 other blocks are placed to the right and left of that block (resulting in a 3 x 1 panel) here is what I have so far:

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Code: Select all

local on_place_trans = function(pos, node, placer)
        if node.name == 'mod:panel_center'then
        fdir = minetest.dir_to_facedir(placer:get_look_dir())
        minetest.env:add_node({x=pos.x+1, y=pos.y, z=pos.z}, { name = "mod:panel_right", paramtype2='none', param2=fdir})
        nodeupdate(pos)
        minetest.env:add_node({x=pos.x-1, y=pos.y, z=pos.z}, { name = "mode:panel_left", paramtype2='none', param2=fdir})
        nodeupdate(pos)
        end
        end

minetest.register_on_placenode(on_place_trans)

what happens currently is that the 2 nodes place to the x+1 and x-1. What i want to do, but don't know how, is to code it so that if placer:dir = front then it will use the x+1 and x-1, if the placer:dir = right then it will use the z-1 and z+1. If someone could tell me how to code something like that, that would be great.

[prestidigitator]

I am trying to make it so when a block is placed then 2 other blocks are placed to the right and left of that block....

Just test whether the absolute value of the look direction's x or z coordinate is smaller, and modify that direction. Something like:

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Code: Select all

local lookDir = placer:get_look_dir()
local pos1, pos2
if math.abs(lookDir.x) < math.abs(lookDir.z) then
   pos1 = { x = pos.x-1, y = pos.y, z = pos.z }
   pos2 = { x = pos.x+1, y = pos.y, z = pos.z }
else
   pos1 = { x = pos.x, y = pos.y, z = pos.z-1 }
   pos2 = { x = pos.x, y = pos.y, z = pos.z+1 }
end


[Casimir]

I tried to make a register_on_item_eat function, but failed. Nothing happens.

in item.lua

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Code: Select all

function minetest.register_on_item_eat(hp_change, replace_with_item)
    print("[register_on_item_eat] 2")
    return function(itemstack, user, pointed_thing)  -- closure
        if itemstack:take_item() ~= nil then
            user:set_hp(user:get_hp() + hp_change)
            itemstack:add_item(replace_with_item) -- note: replace_with_item is optional
        end
        return itemstack
    end
end

function minetest.item_eat(hp_change, replace_with_item)
    print("[register_on_item_eat] 1")
    -- Run script hook
    local _, callback
    for _, callback in ipairs(minetest.registered_on_item_eat) do
        -- Copy hp_change and replace_with_item because callback can modify them
        local hp_change_copy = {x=pos.x, y=pos.y, z=pos.z}
        local replace_copy = hp_change
        callback(hp_change_copy, return_copy)
    end
end

in misc_register.lua

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Code: Select all

minetest.registered_on_item_eat, minetest.register_on_item_eat = make_registration()

[jojoa1997]

I think you either have to change player.lua or some code that is in C++

[prestidigitator]

I tried to make a register_on_item_eat function, but failed. Nothing happens.

Here is why. minetest.item_eat(...) is called by mods when they are registering items. This is before the game is really started, and players do not have the chance yet to interact. At that time your list of callbacks is probably going to be empty or uninteresting (depending on what mods have been loaded in what order), so calling them probably isn't going to do much. Also, the way the mods use minetest.item_eat(...), they expect it to return a function to assign to the item's on_use() callback. Your minetest.item_eat(...) returns nothing (nil). So when the player takes an item and left-clicks with it to use it, the game will see the item's on_use as nil, meaning there is no callback.

Your other function...I think maybe you meant to call minetest.register_on_item_eat(...) rather than define it? Not sure.

(And no, this doesn't need to be done in C++. It is very possible to do it in Lua.)

[Likwid H-Craft]

Is there a way make a node, to be set on fire forever like MC Nether block?

[Zsoltisawesome]

Is there way to make a node edible?

[Likwid H-Craft]

Is there way to make a node edible?

Yes

[Zsoltisawesome]

Is there way to make a node edible?

Yes

How? I Really Need To KNOW!

[Likwid H-Craft]

Add this:
on_use = minetest.item_eat(#),
#: Any number.

[ch98]

Copy of my forcefield mod help topic:


I am going to make a forcefield mod where undigable block (forcefield block) is placed around about 6 blocks from forcefield generator block when it has coal in it and takes a coal away every 10 times forcefield block is hit, every 10 seconds, or if any block is missing, and destroys all forcefield block when there is no more coal. I am stuck on part detecting if coal is in the forcefield generator and there will be way more help needed afterwards.

init.lua:

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Code: Select all

minetest.register_node("forcefield:forcefield", {
    tiles = {"forcefield_forcefield.png"},
    drawtype = glasslike,
    sunlight_propagates = true,
    walkable = true,
    diggable = false,
    on_punch = function(pos, node, puncher)
        pos = position
        a = "a" + "1"
    end,
})




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



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},
    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 = 1.0,
    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 fuel = inv:get_list("coal")
            if fuel == "default:coal_lump" then
            srcstack = inv:get_stack("coal", 1)
                    srcstack:take_item("default:coal_lump")
                    inv:set_stack("coal", 1, srcstack)
                else
                    print("there was no coal")
        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'},
    }
})



[prestidigitator]

Copy of my forcefield mod help topic:
...
I am stuck on part detecting if coal is in the forcefield generator....

Non-copy of answer: http://forum.minetest.net/viewtopic.php?pid=81855#p81855

;-)

[pandaro]

how to handle collisions between objects?

[1244]

Why this function isn't working?

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Code: Select all

function register_element (name1,image,description1)
minetest.register_alias("chemistry:..name1..","..name1..")

minetest.register_craftitem("chemistry:..name1..", {   
description = "..description1..",
inventory_image = "..image.."
})
end


[deivan]

I think ".." don't be a valid part of a name.

[kaeza]

Why this function isn't working?

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Code: Select all

function register_element (name1,image,description1)
minetest.register_alias("chemistry:..name1..","..name1..")

minetest.register_craftitem("chemistry:..name1..", {   
description = "..description1..",
inventory_image = "..image.."
})
end


Maybe this is what you meant:

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Code: Select all

function register_element (name1,image,description1)
minetest.register_alias(name1,"chemistry:"..name1)

minetest.register_craftitem("chemistry:"..name1, {   
description = description1,
inventory_image = image
})
end