Post your modding questions here

[Byakuren]

I would like to know on how should I start modding the game since I am a newbie. Also I have read a few tutorials on the game but I am still not clear.

I would also like to know on how some of the modders on this forum got started.

If you have enough programming experience in Lua or a similar language, you can come up with a mod idea that interests you and write it while referencing lua_api.txt.

[darkflamez]

Thank you guys for your suggestions.

I will look in to all of them :)

[KCoombes]

While playing around with the default:furnace code, I have discovered a curious fact - no type of 'processing' node - eg. furnace, workbench, claycrafter - can have more than 1 input (source) item. Is this a limitation of the engine, or was the code deliberately restricted for some reason?

[red-001]

While playing around with the default:furnace code, I have discovered a curious fact - no type of 'processing' node - eg. furnace, workbench, claycrafter - can have more than 1 input (source) item. Is this a limitation of the engine, or was the code deliberately restricted for some reason?

Then lua code was just written that way.

[darkflamez]

I would like to know on ... with a mod idea that interests you and write it while referencing lua_api.txt.

Where is the lua_api.txt

[KCoombes]

I would like to know on ... with a mod idea that interests you and write it while referencing lua_api.txt.

Where is the lua_api.txt

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

[darkflamez]

Thanks KCoombes

[Hybrid Dog]

l tried to make the furnace work when it's unloaded, can you tell me if l did mistakes?
https://github.com/HybridDog/minetest_g ... urnace.lua

[KCoombes]

This code (from the Lua Modding API Reference) does not function correctly. Any ideas?

drop = {
max_items = 1, -- Maximum number of items to drop.
items = { -- Choose max_items randomly from this list.
{
items = {"foo:bar", "baz:frob"}, -- Choose one item randomly from this list.
rarity = 1, -- Probability of getting is 1 / rarity.
},
},
},
As written, the node is dropping 1 of each item in the list, not 1 random item in the list.

[pithy]

Is there a way to have world specific textures?

[Don]

This code (from the Lua Modding API Reference) does not function correctly. Any ideas?

drop = {
max_items = 1, -- Maximum number of items to drop.
items = { -- Choose max_items randomly from this list.
{
items = {"foo:bar", "baz:frob"}, -- Choose one item randomly from this list.
rarity = 1, -- Probability of getting is 1 / rarity.
},
},
},
As written, the node is dropping 1 of each item in the list, not 1 random item in the list.

I could be wrong but I think your rarity needs to be higher.
Here is an example from one of my mods.
https://github.com/DonBatman/mytreasure ... nd.lua#L27

[KCoombes]

-snip-

I could be wrong but I think your rarity needs to be higher.
Here is an example from one of my mods.
https://github.com/DonBatman/mytreasure ... nd.lua#L27

Your example was exactly what I needed to see! The node is now dropping correctly, except.. (you saw that coming, right?) I have 6 possible items, so I set rarity = 6 (rarity being 1/rarity value) to ensure 1 of the 6 will drop every time - except out of 10 trials, I ended with only 8 drops - have you encountered this? Max_items = 1, for this.

[Don]

Your example was exactly what I needed to see! The node is now dropping correctly, except.. (you saw that coming, right?) I have 6 possible items, so I set rarity = 6 (rarity being 1/rarity value) to ensure 1 of the 6 will drop every time - except out of 10 trials, I ended with only 8 drops - have you encountered this? Max_items = 1, for this.

I never noticed it happen. Doesn't mean that it hasn't happened though. If it keeps happening then it might be something you should put in the bug forum.

[Nightmare_LP]

How do I make a biome?
I have tried many ways I found on the Internet bur nothing seems to work. Can anyone help me? And sorry if this has been asked before but I need help.

[Hybrid Dog]

drop = {
max_items = 1,
items = {
{
items = {"default:diamond"},
rarity = 2,
},
{
items = {"default:mese_crystal"},
rarity = 2,
},
}
}

l think this code does this:

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

if math.random(2) == 1 then
return "default:diamond"
end
if math.random(2) == 1 then
return "default:mese_crystal"
end


But you want to make it do this:

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

if math.random(2) == 1 then
return "default:diamond"
else
return "default:mese_crystal"
end


l think if you keep the simple code, the behaviour is similar to the abm behaviour

so instead of this:

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

drop = {
   max_items = 1,
   items = {
      {
         items = {"default:diamond"},
         rarity = 3,
      },
      {
         items = {"default:mese_crystal"},
         rarity = 3,
      },
      {
         items = {"default:mese"},
         rarity = 3,
      },
   }
}

try this

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

drop = {
   max_items = 1,
   items = {
      {
         items = {
            {
               items = {"default:mese"},
               rarity = 2,
            },
            {
               items = {"default:diamond"},
               rarity = 1,
            },
         },
         rarity = 3/2,
      },
      {
         items = {"default:mese_crystal"},
         rarity = 1,
      },
   }
}

and so on

note that l don't know if it works

[KCoombes]

How do I make a biome?
I have tried many ways I found on the Internet bur nothing seems to work. Can anyone help me? And sorry if this has been asked before but I need help.

Look at the mapgen.lua file in the default minetest_game mods/default folder for example of the vanilla game's biome structure. Duplicate that code, changing what you want. Save as "mapgen.lua" in a folder "myworld" (that's the name of your mod, btw) then start a new world and enable your mod.

[TumeniNodes]

How do I make a biome?
I have tried many ways I found on the Internet bur nothing seems to work. Can anyone help me? And sorry if this has been asked before but I need help.

Look at the mapgen.lua file in the default minetest_game mods/default folder for example of the vanilla game's biome structure. Duplicate that code, changing what you want. Save as "mapgen.lua" in a folder "myworld" (that's the name of your mod, btw) then start a new world and enable your mod.

Yes, definitely DO NOT ever forget to save a backup copy of the original. That is the most important step. : )
Also, make a backup of your changed file because, if an update comes from Minetest..., it will overwrite your custom work. ; )

[KCoombes]

Ok, new problem (I solved the previous problem of non-loading biomes):

All nodes registered
All biomes registered
All decorations registered
Start new map... biomes generate properly, decorations generate properly.... and the default flowers generate as well (debug shows that default:flowers.lua loads after my file)...

How to stop the default flowers from generating in this particular world (short of removing the file, as it's used by other mods in use on other worlds)?

[222]

I was hoping to write recipes for TumeniNodes' angledstairs mod; I was wondering if there was an easier way to write it without listing every single variant.

I saw how 'stairs' has one recipe with 'subname' and "recipeitem" but I don't understand how it works.

[KCoombes]

Continuation of my previous question:

[img]

screenshot_20160630_115625.png

[/img]

The lighter colored dirt/grass block is my own texture, aliased to replace default textures (which doesn't work as intended), and every node used in my custom biomes uses the custom texture correctly, but the default biomes continue to use the default textures.

Obviously I'm not registering the alias in the correct place, but I can't see to work out where/how to fix this. And yes, I continue to get this error in debug.txt: 2016-06-30 11:52:52: WARNING[Main]: Not registering alias, item with same name is already defined: default:dirt -> custom:dirt

[Nightmare_LP]

Look at the mapgen.lua file in the default minetest_game mods/default folder for example of the vanilla game's biome structure. Duplicate that code, changing what you want. Save as "mapgen.lua" in a folder "myworld" (that's the name of your mod, btw) then start a new world and enable your mod.

Thank you for the advice. But where is this myworld folder suppose to be? I don't know.

[KCoombes]

Look at the mapgen.lua file in the default minetest_game mods/default folder for example of the vanilla game's biome structure. Duplicate that code, changing what you want. Save as "mapgen.lua" in a folder "myworld" (that's the name of your mod, btw) then start a new world and enable your mod.

Thank you for the advice. But where is this myworld folder suppose to be? I don't know.

Create a folder called "myworld" in your mods folder.

[isaiah658]

Topic: Allow breaking a node by hand but only give drops if broken by proper tool?

Edit: Solved. A tool can apparently be defined in the drop of a node. You then just need to make sure the hand is able to break that node.

[KCoombes]

Solved, thanks.

[DoyleChris]

Trying to create a recipe to make a modified battery from technic.

the original recipe is this.

minetest.register_craft({
output = 'technic:battery',
recipe = {
{'group:wood', 'default:copper_ingot', 'group:wood'},
{'group:wood', 'moreores:tin_ingot', 'group:wood'},
{'group:wood', 'default:copper_ingot', 'group:wood'},
}
})

I would like to make 9 batteryies by changing the recipe to this

minetest.register_craft({
output = 'technic:battery 9',
recipe = {
{'group:wood 9', 'default:copperblock', 'group:wood 9'},
{'group:wood 9', 'moreores:tin_block', 'group:wood 9'},
{'group:wood 9', 'default:copperblock', 'group:wood 9'},
}
})

But whn i add the 9's to the recipe it dosent work.

[burli]

How can I calculate yaw from a vector?

[Naj]

But whn i add the 9's to the recipe it dosent work.

Because receipes do not use quantity. When a reciepe needs two or more items, they appear separately in the receipe, never stacked.

[burli]

How can I calculate yaw from a vector?

I guess atan2(x,z). Is that right?

[isaiah658]

Topic: Is it possible to change the font color in a textarea in a formspec?
Reason: I'm trying to change how the default formspec looks for a book and I wanted the font color to be something other than white to make it easier to read.

[teh_newbz]

Why is player:getpos() returning nil? Whenever I try to use player:getpos() the game crashes with `attempt to call getpos a nil value`

The code

minetest.register_craftitem("magic_mod:summon_monster_stone", {
description = "Summon a stone monster",
inventory_image = "magic_mod_summon_sword.png",
on_use = function(player)
local p = player:getpos()
minetest.spawn_tree(p, treedef)
end})


If I move local `p = player:getpos()` outside of the function I get `attempt to index global player (a nil value)