Post your modding questions here

[vitalie]

How should I register a node, so that it disappears on digging without appearing in player's inventory and without dropping anything?

[azekill_DIABLO]

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minetest.register_node("fruitgrow:apples", {
   description = "Apples",
   paramtype = "light",
   tiles = {"default_apple.png^default_leaves.png^default_torch_animated.png"},
   drawtype = "allfaces_optional",
   is_ground_content = false,
   groups = {dig_immediate=3, leafdecay=1, leaves=1},
   drop = {
      max_items = 0,
},
})


Here you go !

[vitalie]

azekill_DIABLO, thank you!

I wrote "drops = " instead of "drop = ", and couldn't understand why it doesn't work.

[Soudon]

Ok so I am attempting to make my own mod and it is one that is adding a few more "modern" weapons to the game. This is the error I get

init.lua:4: '<eof>' expected near 'end'

First my init.lua looks like this

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local modpath = minetest.get_modpath(minetest.get_current_modname())

dofile(modpath.."/guns.lua")
end

and I do have a separate lua called guns.lua and it looks like this

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modernguns:register_weapon("modernguns:mp5holo", {
   description = "MP5(ranged damage 3|max ammo 30)",
   inventory_image = "modernguns_mp5holo.png",
   rounds = 10,
   shots = 3,
   spec = {
      range = 285,
      step = 20,
      tool_caps = {full_punch_interval=0.125, damage_groups={fleshy=3}},
      groups = {snappy=3, fleshy=3, oddly_breakable_by_hand=3},
      sound = "modernguns_mp5",
      particle = "modernguns_bullet.png",
   },
})

[pithy]

Remove "end" in the first file.

[Soudon]

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2016-06-02 22:44:55: WARNING[Main]: NodeDefManager: Ignoring CONTENT_IGNORE redefinition
2016-06-02 22:44:55: WARNING[Main]: Undeclared global variable "modernguns" accessed at ...test\bin\..\games\minetest_game\mods\modernguns/guns.lua:1
2016-06-02 22:44:55: ERROR[Main]: ModError: Failed to load and run script from C:\Games\Minetest\bin\..\games\minetest_game\mods\modernguns\init.lua:
2016-06-02 22:44:55: ERROR[Main]: ...test\bin\..\games\minetest_game\mods\modernguns/guns.lua:1: attempt to index global 'modernguns' (a nil value)
2016-06-02 22:44:55: ERROR[Main]: stack traceback:
2016-06-02 22:44:55: ERROR[Main]:    ...test\bin\..\games\minetest_game\mods\modernguns/guns.lua:1: in main chunk
2016-06-02 22:44:55: ERROR[Main]:    [C]: in function 'dofile'
2016-06-02 22:44:56: ERROR[Main]:    ...test\bin\..\games\minetest_game\mods\modernguns\init.lua:3: in main chunk
2016-06-02 22:44:56: ERROR[Main]: Check debug.txt for details.

Throws this now that I removed end,

OK I got it to load into the game now I just need to figure out this "projectile thing"

instead of reinventing the wheel I'm going to use the mod shooter and just revamp it with new weapons

[Izaya]

Topic: Lua 5.1 replacements for bit32?
Reason: Need to extract bits from bytes
I've played with bit32 in lua 5.2 but 5.1 lacks it. What other options do I have in the context of Minetest?

[TumeniNodes]

With the new doors api, is it possible to make doors utilize 2 node spaces..., so doors are place in the center of nodes and then able to occupy a portion of the next node when in the open position?
It took me a few minutes to figure out why, when I changed the doors pos, that it would just swing to the side within the same space (looking extremely odd)

[sofar]

With the new doors api, is it possible to make doors utilize 2 node spaces..., so doors are place in the center of nodes and then able to occupy a portion of the next node when in the open position?
It took me a few minutes to figure out why, when I changed the doors pos, that it would just swing to the side within the same space (looking extremely odd)

No, the doors API only supports the classical door mesh that is 1 node wide/deep, and 2 nodes high.

[amadin]

How change formspec background image and buttons background in inventory_plus (http://github.com/cornernote/minetest-i ... s/init.lua)?

[TumeniNodes]

With the new doors api, is it possible to make doors utilize 2 node spaces..., so doors are place in the center of nodes and then able to occupy a portion of the next node when in the open position?
It took me a few minutes to figure out why, when I changed the doors pos, that it would just swing to the side within the same space (looking extremely odd)

No, the doors API only supports the classical door mesh that is 1 node wide/deep, and 2 nodes high.

Bummer

[TumeniNodes]

How change formspec background image and buttons background in inventory_plus (http://github.com/cornernote/minetest-i ... s/init.lua)?

Hope I am not overstepping by trying to answer this?
Inventory Plus seems to use the default gui images. The background image is simply a tile, which is repeated to cover the area set in the x, and y coords, and the slots is the same.
You may need to figure out the overall "area" of the bg and convert it to px sizes, then create the background image to that size, then replace the default "gui_formbg.png" with your new image.
For the buttons (or slots I presume you mean), simply create a 49px X 49px image to replace the default "gui_hb_bg.png" with.
At least this is what I see from a quick glance
*VERY IMPORTANT! Just remember..., and NEVER forget to back up the original copies before you begin. If anything goes wrong you can use the backups to revert too.
If you need some help with this, I can offer it, simply ask. I have played around with similar aspects in Minetest, it just takes some poking around and no fear in experimenting : )

[oscar14]

Topic: how can i make a node that's only placeable in a tipe of node?

Reason: I want to make a mod of a furnace for alloys that's too hot and can only be placed on stone.

More Info: I am new in modding but I want to learn. Also sorry for my english, is not my native language.

[KCoombes]

you might check the default:furnace code, as I know there's an effect if you use a furnace next to/on ice (not sure if TenPlus1 coded that for Xanadu)

[oscar14]

you might check the default:furnace code, as I know there's an effect if you use a furnace next to/on ice (not sure if TenPlus1 coded that for Xanadu)

Ok thanks, I will check that.

[Byakuren]

Topic: how can i make a node that's only placeable in a tipe of node?

Reason: I want to make a mod of a furnace for alloys that's too hot and can only be placed on stone.

More Info: I am new in modding but I want to learn. Also sorry for my english, is not my native language.

Define the "on_place" field of the node's definition. More specifically, override it so that if the placement is in a good spot, you call minetest.item_place and return its output. Otherwise, return the original itemstack without doing anything. This would look something like:

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minetest.register_node("mymod:my_node", {
  -- Other fields coming before
  on_place = function(itemstack, placer, pointed_thing)
    local undernode = ... -- Get the node under the location the player tried to place
    local is_good = ... -- Check that the node is valid for placing a furnace on.

    if is_good then
      return minetest.item_place(itemstack, placer, pointed_thing)
    else
      return itemstack
    end
  end,
  -- Other fields coming after
})


[oscar14]

Define the "on_place" field of the node's definition. More specifically, override it so that if the placement is in a good spot, you call minetest.item_place and return its output. Otherwise, return the original itemstack without doing anything. This would look something like:

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Code: Select all

minetest.register_node("mymod:my_node", {
  -- Other fields coming before
  on_place = function(itemstack, placer, pointed_thing)
    local undernode = ... -- Get the node under the location the player tried to place
    local is_good = ... -- Check that the node is valid for placing a furnace on.

    if is_good then
      return minetest.item_place(itemstack, placer, pointed_thing)
    else
      return itemstack
    end
  end,
  -- Other fields coming after
})


Thanks!! I was thinking in something like that but didn't know how to do it specifically.

[kaeza]

Topic: Lua 5.1 replacements for bit32?
Reason: Need to extract bits from bytes
I've played with bit32 in lua 5.2 but 5.1 lacks it. What other options do I have in the context of Minetest?

If you know how to set up native libraries (hint: it's not hard, but not trivial either, particularly on Windows; see IRC mod for some tips), you can find a native bit library somewhere by using Google.

If you don't care about/need lightning fast performance, I have some code implementing bitwise operators in pure Lua. </selfpromotion>

EDIT: Also, if running under LuaJIT, you have a bit library at your disposal.

[KCoombes]

can a decoration have a drop, or do I have to use the farming mod to accomplish that?

[orwell]

can a decoration have a drop, or do I have to use the farming mod to accomplish that?

AFAIK, to register a decoration you do:
- register the node for it, where you can insert anything what can be put into any other node definition, like drops
and then
- call register_decoration to make the mapgen place that node at random places in the world.

so it should be no problem to write drop="mydecorations:whatever" into the node definition (register_node)

------------
Question: has anyone here experience with animated models? I need to export a model from blender. What should be exported and what not for it to work in MT, and is there a way to display information about an exported mesh in minetest to see if it worked?
(the best would be if someone experienced could export this model. note, if you just export everything the model does not appear in MT (maybe it's the lamp?))

[pithy]

Is there a way to make minetest.line_of_sight cut corners?

[amadin]

There i can find information about textpos? I need change indent on the edges of sign (left, right, up and down) in this code:

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signs_lib.metal_wall_sign_model = {
   nodebox = {
      type = "fixed",
      fixed = {-0.4375, -0.25, 0.4375, 0.4375, 0.375, 0.5}
   },
   textpos = {
      {delta = {x =  0,     y = 0.07, z =  0.43  }, yaw = 0},
      {delta = {x =  0.43,  y = 0.07, z =  0     }, yaw = math.pi / -2},
      {delta = {x =  0,     y = 0.07, z = -0.43  }, yaw = math.pi},
      {delta = {x = -0.43,  y = 0.07, z =  0     }, yaw = math.pi / 2},
   }
}


[Hybrid Dog]

Is there a way to make minetest.line_of_sight cut corners?

You could use your own line function,
the direction vector is given, sort the coords by its abs size (e.g. {x=9, y=6, z=-7} → "x", "z", "y")
and then loop, the inner loop is of the smaller coords
etc.

[Sobralia]

Considering registering privliges like that:

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minetest.register_privilege("foo", privilege definition)

And using it in chat command ie:

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minetest.register_chatcommand("foo", {
   params = "<bar>",
   description = "Do bar with foo",
   privs = {foo = true},
   func = function( _ , text)
      minetest.chat_send_all(text)
      return true, "foo did bar well"
   end,
})

I'm wondering why we must provide a boolean list to chat command, why not a string list?

[rubenwardy]

It makes things easier when doing this:

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local privs = minetest.get_player_privs("name") -- not sure if right function
if privs.shout then
    -- has shout
else
    -- doesn't have shout
end


Otherwise you'd need to do a linear search, or sort the list and do a binary search.
For example:

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local privs = minetest.get_player_privs("name") -- not sure if right function
for i, priv in pairs(privs) do
    if priv == "shout" then
        -- has shout
        return
    end
end

-- doesn't have shout
return


[Gerald]

I want to execute a function every time a day passes (clock strikes midnight or player sleeps in bed).
Is there a better solution than this:

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function check_day(old_count)
   local new_count = minetest.get_day_count()
   if new_count > old_count then
      execute()
   end
   minetest.after(10, check_day, new_count)
end


[iangp]

I want to execute a function every time a day passes (clock strikes midnight or player sleeps in bed).
Is there a better solution than this:

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function check_day(old_count)
   local new_count = minetest.get_day_count()
   if new_count > old_count then
      execute()
   end
   minetest.after(10, check_day, new_count)
end


Why you don't simple get the time of day instead?
I haven't tested but something like that:

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function check_day()
       if minetest.get_timeofday() == 1 -- 1 is midnight, end of day
            execute() --Do what you whant
       end
       local time_speed = setting_get("time_speed")
       minetest.after(24*60*60*60/time_speed, check_day)
end


[Gerald]

Why you don't simple get the time of day instead?

(timefoday == 1) I do not know if and how long this statement is evaluated to true and it will not work if something manipulates time.

[iangp]

Then your solution is fine enough
I don't like use globalsteps and afters but it's currently the only way...
We haven't yet a event listener or something like that in modding api (and I don't even know how to implement that and how difficult it is, I can't C (lol ok I'll stop))

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minetest.add_listener(<var - to - bind>, <desired - value> ,<callback - function>)
--or even some expression
minetest.add_listener(<boolean function>,<callback function>)


[ynong123]

Topic: How to know that user clicks "Esc" to exit a formspec?
Reason: I want to update my mod "Password Chest".