Post your modding questions here

[benrob0329]

Thanks all, I'd tell you what in working on but I'm not sure how far I'll get with it.
If I do get something done, I'll be sure to post it though!

[stu]

Not perfect, but MUCH better:

Along with the uv errors already pointed out, It looks to me as though the mesh is non-manifold, that can also cause some pretty strange visual effects in-game.

[bidaian]

Topic: How do I move a node?

After creating tutorial:decowood and reading about growing default:junglegrass I wanted to move decowood with this code. But nothing happens. What do I need to move a node?

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Code: Select all

minetest.register_abm({
        nodenames = {"tutorial:decowood"},
        interval = 10,
        chance = 1,
        action = function(pos)
                pos.y = pos.y + 1
        end,
})


[Foghrye4]

bidaian, "pos" table in function is just a copy of an information about actual node position. Changing it will do nothing. You need to delete node on a old position and add on a new. Check how to do it here: http://dev.minetest.net/Category:Methods

[Hybrid Dog]

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Code: Select all

minetest.register_abm({
        nodenames = {"tutorial:decowood"},
        interval = 10,
        chance = 1,
        action = function(pos, node)
                pos.y = pos.y + 1
                if minetest.get_node(pos).name == "air" then
                       minetest.set_node(pos, node)
                       pos.y = pos.y - 1
                       minetest.remove_node(pos)
                end
        end,
})

[bidaian]

bidaian, "pos" table in function is just a copy of an information about actual node position. Changing it will do nothing. You need to delete node on a old position and add on a new. Check how to do it here: http://dev.minetest.net/Category:Methods

Thanks. I wanted to do something that moved sheep-like and destroying and recreating sounded like a lot of work. But I guess I still have to learn a lot, maybe that's not simply a block. Anyway, it's great, with the decowood example, the wiki, the forum and the source of the other mods, lots of things can be done!

[bidaian]

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Code: Select all

minetest.register_abm({
        nodenames = {"tutorial:decowood"},
        interval = 10,
        chance = 1,
        action = function(pos, node)
                pos.y = pos.y + 1
                if minetest.get_node(pos).name == "air" then
                       minetest.set_node(pos, node)
                       pos.y = pos.y - 1
                       minetest.remove_node(pos)
                end
        end,
})

It does, but in one iteration it goes as high as it can. It was on the ground one second and underneath the branches in the next move. I'll work on it. Thanks also for bringing up the relationship with the environment. I was ready to go through anything that was already there :).

[paramat]

How I can reset player skybox to default server? I want temporally change user skybox and then return to 'normal'.

https://github.com/paramat/moonrealm/blob/master/init.lua#L206

[everamzah]

Is it possible to make modifications to an ItemStack using the on_take callback of a detached inventory?

[Foghrye4]

Is it possible to make modifications to an ItemStack using the on_take callback of a detached inventory?

Yes. Don't forget to call "set_stack("listname", i, stack)" with your modificated stack on receiver inventory.

[Hybrid Dog]

It does, but in one iteration it goes as high as it can. It was on the ground one second and underneath the branches in the next move. I'll work on it. Thanks also for bringing up the relationship with the environment. I was ready to go through anything that was already there :).

the code should actually make it move 1 m ("perform one iteration") every 10 seconds
time(P) = (log(P*chance)/log(1-1/chance)+1)*interval

interval = 10; chance = 1

time(P) = lim(chance → 1, (log(P*chance)/log(1-1/chance)+1)*10)
= lim(h → 0, (log(P*(h+1))/log(1-1/(h+1))+1)*10)
= 1*10 = 10 = interval
Maybe it works if you disable catch_up

[everamzah]

Is it possible to make modifications to an ItemStack using the on_take callback of a detached inventory?

Yes. Don't forget to call "set_stack("listname", i, stack)" with your modificated stack on receiver inventory.

Thanks!! That was the trick, though I needed to use set_stack() in the allow_take callback, and not the on_take one.

[rubenwardy]

It does, but in one iteration it goes as high as it can. It was on the ground one second and underneath the branches in the next move. I'll work on it. Thanks also for bringing up the relationship with the environment. I was ready to go through anything that was already there :).

the code should actually make it move 1 m ("perform one iteration") every 10 seconds
time(P) = (log(P*chance)/log(1-1/chance)+1)*interval

interval = 10; chance = 1

time(P) = lim(chance → 1, (log(P*chance)/log(1-1/chance)+1)*10)
= lim(h → 0, (log(P*(h+1))/log(1-1/(h+1))+1)*10)
= 1*10 = 10 = interval
Maybe it works if you disable catch_up

It's possible that it updates the same node multiple times in one abm run (as it is placed in a new position that may not have been run.)

[AnxiousInfusion]

Hello, I'm trying to get player position to feed into add_item but there is little documentation outside of Rubenwardy's API reference so I'm somewhat stuck.

Is this even close to being correct?

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Code: Select all

minetest.add_item(player:getpos(), "mymod:myitem")

It returns the error: attempt to index global 'player' (a nil value)

[rubenwardy]

Take a look at this chapter: http://rubenwardy.com/minetest_modding_ ... ories.html

You don't store items at a player's position, you store them in a player.

[Hybrid Dog]

AnxiousInfusion, where do you use this code?

[AnxiousInfusion]

Take a look at this chapter: http://rubenwardy.com/minetest_modding_ ... ories.html

You don't store items at a player's position, you store them in a player.

Your guide has been a thoroughly helpful tool but I have not communicated well what I am trying to achieve. I actually want the item to be dropped at the player's position and I have had some success with:

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Code: Select all

player = minetest.env:get_player_by_name("singleplayer")
minetest.add_item(player:getpos(), "mymod:myitem")

The only problem being "singleplayer" limits the mod to offline, solo use. Is there a more generic term I could use to refer to the player?

AnxiousInfusion, where do you use this code?

Please bear with me, I am learning the ropes at Minetest modding.

[Don]

Take a look at this chapter: http://rubenwardy.com/minetest_modding_ ... ories.html

You don't store items at a player's position, you store them in a player.

Your guide has been a thoroughly helpful tool but I have not communicated well what I am trying to achieve. I actually want the item to be dropped at the player's position and I have had some success with:

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Code: Select all

player = minetest.env:get_player_by_name("singleplayer")
minetest.add_item(player:getpos(), "mymod:myitem")

The only problem being "singleplayer" limits the mod to offline, solo use. Is there a more generic term I could use to refer to the player?

env: is depreciated. You should remove it.
Without knowing the rest of the code it is hard to know what you are doing. Is this inside an abm or a certain function in a node? If you could post more code it would be much easier to help you.

[rubenwardy]

Try

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Code: Select all

minetest.add_item(player:getpos(), ItemStack("mymod:myitem"))


mods are only run on the server side, there is no current player

[AnxiousInfusion]

So a while back I decided to work toward the goal of producing a reasonable Star Ships mod. And with Lua being new territory to me, I knew I should start small so I pulled an all nighter and hammered out this rudimentary mod to wrap my head around the basics.

I'm still trying to understand how set_breath() can be used to decrement the bubbles bar, and how to bind a key to execute a function. Does Lua not allow this?

[sofar]

I'm still trying to understand how set_breath() can be used to decrement the bubbles bar, and how to bind a key to execute a function. Does Lua not allow this?

As far as the keybindings, yes, mods can't override key bindings. You can find out if a player has pressed a standard movement key, but that's it.

[Hybrid Dog]

There are the functions minetest.on_key_press and minetest.on_key_release:
http://dev.minetest.net/User:Hybrid_Dog ... _functions

[KCoombes]

Is it possible to add to/create new PlayerArgs via a mod, or will I have to edit the sourcecode?

[AnxiousInfusion]

There are the functions minetest.on_key_press and minetest.on_key_release:
http://dev.minetest.net/User:Hybrid_Dog ... _functions

Hybrid, this is incredible and almost exactly what I had in mind. I hope it is okay if I copy/paste those register_on_key_ functions into my mod.

[Hybrid Dog]

thanks, the code is free to use (WTFPL)

[sofar]

Is it possible to add to/create new PlayerArgs via a mod, or will I have to edit the sourcecode?

We want to add this functionality to core, there are some proposals around to implement this:

https://github.com/minetest/minetest/pull/4139

[AnxiousInfusion]

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Code: Select all

array = { initializingvalue = {0} }
math.randomseed(os.clock()*100000000000)
minetest.register_globalstep(function(dtime)
   for _, user in pairs(minetest.get_connected_players()) do
      item = user:get_player_name()
      array.item = array.item + dtime;

attempt to perform arithmetic on field 'item' (a nil value)

Paradox: I need to increment the "item" value in "array" every global step, but the first time through the loop won't work until "array.item" has a numeric value. If I assign an initial value, it won't increment for every step (this is a timer). What do?

EDIT: So sorry if I'm spamming up this thread... I have solved(?) the issue by using an if statement to test whether the array.item is nil or not and the timer is working now. Of course, if there is still a better way to be doing this please let me know.

[kaeza]

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Code: Select all

array = { initializingvalue = {0} }
math.randomseed(os.clock()*100000000000)
minetest.register_globalstep(function(dtime)
   for _, user in pairs(minetest.get_connected_players()) do
      item = user:get_player_name()
      array.item = array.item + dtime;

attempt to perform arithmetic on field 'item' (a nil value)

Maybe you meant `array[item]`. The two are not the same.

The code `array.item` is equivalent to `array["item"]` (i.e. set an actual field named "item"), while `array[item]` sets the field referred to by the variable `item`, which holds the player name (which in your code is probably what you want).

Edit: Also, remember to declare variables local to the scope on which they are used. `item` is global in your case.

Edit 2: Also, please don't use `math.randomseed`; the engine already does that for you.
Finally, as a minor nitpick, you don't need semicolons at the end of statements :)

[Godo]

Topic: inventory in creative mode
Reason: mismatched items (pop-up names) and icons.
More info: the pop-up names are correct, but the icons sometimes do not match them.

Hi, I hope I'm in the right forum, I have a problem with Minetest version 0.4.13, when playing Minetest game in creative mode the item icons in the inventory do not match the item descriptions (the pop-up names). For example, to select "glass" I have to click on the third icon on the top row of page 3, which shows the image of the furnace. On page 1 of the inventory, the first misplaced icons are the bookshelf and brick block, which seem to occupy each other's place. The next one (bronze ingot) is OK, then the last one (bronze block) shows what looks like a red brick block instead. From page 2 the mixed-up items are more abundant.

I was told in another forum that the order of items in the inventory is determined by the mod, so I can't fix it by hand. So how can I fix that?

[rubenwardy]

Make sure you have the latest version of minetest, 0.4.14.

Does this happen in the normal inventory?
This sounds more like an Engine bug, rather than a mod bug.