Post your modding questions here

[Krock]

If I try to use that it crashes with attempt to index global 'player' (a nil value) for the line containing player:hud_change().

Complete code:

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Code: Select all

minetest.register_on_joinplayer(function(player)
    -- Delay a bit.
    minetest.after(1, function()
        hud_id = player:hud_add({
                ....
        })
    end)


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<snip>
07:46:25: ERROR[main]: ServerError: /home/dirk/.minetest/mods/lp/init.lua:16: attempt to index global 'player' (a nil value)
<snip>

You need the player in your function!

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Code: Select all

    minetest.after(1, function(player)
        hud_id = player:hud_add({
                ....
        })
    end, player)

[Linuxdirk]

You need the player in your function!

hud_add works as expected. Adding player at the location you implied does not change anything in functionality. It still crashes with same error message.

Can you alter and re-post my complete code to make 100 percent clear what change at what location you’re talking about?

[Krock]

You need the player in your function!

hud_add works as expected. Adding player at the location you implied does not change anything in functionality. It still crashes with same error message.

Well, you have to do the same with the function "changeText()":

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function changeText(player)
    player:hud_change(hud_id, 'text', 'Changed text')
    minetest.after(5, changeText, player)
end

-- This line is not valid because there is no player available in the current context
minetest.after(5, changeText, player)


[Linuxdirk]

Well, you have to do the same with the function "changeText()"

Please re-post my code with your proposed changes. I added player in all locations you implied (but never clearly stated). Still crashes after 5 seconds.

[Topywo]

It lets me in game now, but the gui does not pop up. I guess my ultimate question would be how I would get that to show up?

I created a folder aoe. Created a depends.txt with default in it and created an init.lua with your code in it:



Did you place a new townblock to try out your last changes? Old(er) blocks with formspecs keep their older code. To see changes in the code you made, you must place a new formspec block and open it.

[Krock]

Please re-post my code with your proposed changes.

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Code: Select all

minetest.register_on_joinplayer(function(player)
    -- Delay a bit.
    minetest.after(1, function(player)
        local hud_id = player:hud_add({
            hud_elem_type = 'text',
            position = {x=1, y=0},
            alignment = {x=-1, y=1},
            text = 'First text',
            number = 0xFFFFFF,
            offset = {x=-4, y=4}
        }, player)
        minetest.after(5, changeText, player, hud_id)
    end)
end)

function changeText(player, hud_id)
    player:hud_change(hud_id, 'text', 'Changed text')
    minetest.after(5, changeText, player, hud_id)
end

I hope it's correct now.

[Linuxdirk]

I hope it's correct now.

No, now it instantly crashes instead of after 5 seconds.

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10:32:47: ACTION[ServerThread]: singleplayer leaves game. List of players:
10:32:47: ERROR[main]: ServerError: /home/dirk/.minetest/mods/lp/init.lua:4: attempt to index local 'player' (a nil value)
10:32:47: ERROR[main]: stack traceback:
10:32:47: ERROR[main]:    /home/dirk/.minetest/mods/lp/init.lua:4: in function 'func'
10:32:47: ERROR[main]:    /usr/share/minetest/builtin/game/misc.lua:17: in function '?'
10:32:47: ERROR[main]:    /usr/share/minetest/builtin/game/register.lua:348: in function </usr/share/minetest/builtin/game/register.lua:336>

[Krock]

I hope it's correct now.

No, now it instantly crashes instead of after 5 seconds.

<snip>

Haha. Coded way too fast and added the ', player' to the wrong function.
If you would look at it, you can find this error self:

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            offset = {x=-4, y=4}
        }) -- Remove ', player'
        minetest.after(5, changeText, player, hud_id)
    end, player) -- Add ', player'
end)

[Linuxdirk]

If you would look at it, you can find this error self:

I did and added player as described before. Weird … But finally it works! Thanks for your support! :)

[Nathan.S]

I'm probably missing something obvious, but I'm trying to make a function for a lighter. I have two objects that can be lit, and both of them should result in different fires. I'm running a random number generator and if I get the right number then I want to start the node on fire, actually just call a swap_node. I can't seem to get it to work though. I've tried googleing, but I'm not really sure what to look for. I've tried replacing the and with if and elseif but it makes no difference.

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function burn(pointed_thing) --kindling doesn't always start from the first spark
   ignite_chance = math.random(10)
   if ignite_chance == 1
      and string.find(minetest.get_node(pointed_thing.under).name, 'more_fire:kindling')
      then
         minetest.env:swap_node(pointed_thing.under, {name = 'more_fire:campfire'})
      and string.find(minetest.get_node(pointed_thing.under).name, 'more_fire:kindling_contained')
      then
         minetest.env:swap_node(pointed_thing.under, {name = 'more_fire:contained_fire'})
   else --do nothing
   end
end


never mind I figured it out with help from the flint and steel part of homedecor.

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function burn(pointed_thing) --kindling doesn't always start from the first spark
   ignite_chance = math.random(10)
   if ignite_chance == 1
      and string.find(minetest.get_node(pointed_thing.under).name, 'more_fire:kindling_contained')
      then
         minetest.env:swap_node(pointed_thing.under, {name = 'more_fire:contained_fire'})
   elseif ignite_chance == 1
      and string.find(minetest.get_node(pointed_thing.under).name, 'more_fire:kindling')
      then
         minetest.env:swap_node(pointed_thing.under, {name = 'more_fire:campfire'})

   else --do nothing
   end
end


[kaeza]

By the way, please don't use `minetest.env:xxx(yyy)` as it is deprecated and may be removed in the future. Use `minetest.xxx(yyy)` instead.

[Nathan.S]

By the way, please don't use `minetest.env:xxx(yyy)` as it is deprecated and may be removed in the future. Use `minetest.xxx(yyy)` instead.

Good to know, I'll change that in my code ASAP.

[Hybrid Dog]

By the way, please don't use `minetest.env:xxx(yyy)` as it is deprecated and may be removed in the future. Use `minetest.xxx(yyy)` instead.

Can I use core.xxx(yyy), too?

[4aiman]

I believe you can't.

[kaeza]

Can I use core.xxx(yyy), too?

The `core` namespace is internal/private to the engine. It was never made "public", so no. (I don't know the reason for using that namespace internally and not `minetest` directly)

[Hybrid Dog]

I thought that there it's made public and minetest = core but core wasn't defined in the file
https://github.com/minetest/minetest/co ... 1a8eaa4241

[philipbenr]

How would .mts schematics be placed randomly? With perlin noise or some other way? I have some schematics I want to be placed randomly throughout the world on grass.

[Krock]

How would .mts schematics be placed randomly? With perlin noise or some other way? I have some schematics I want to be placed randomly throughout the world on grass.

You can use Perlin Noise and only check every Xth node if there should be a house or not. Otherwise..well, you'll see what happens.

The 2nd way is to use math.random(), but buildings could collide there aswell.

[philipbenr]

How would .mts schematics be placed randomly? With perlin noise or some other way? I have some schematics I want to be placed randomly throughout the world on grass.

You can use Perlin Noise and only check every Xth node if there should be a house or not. Otherwise..well, you'll see what happens.

The 2nd way is to use math.random(), but buildings could collide there aswell.

I think I will use math.random, because I am placing trees, not houses.

[Sokomine]

i'm struggling with minetest map gen. I would love it if some one could help me with making land flatter. I've seen it totally flat,but i don't like that. so if you could help me with this,i would be so grateful. Thanks!

Best talk to Krock. He's using mapgen parameters on his server which create a relatively (but not absolutely) flat map.

How would .mts schematics be placed randomly? With perlin noise or some other way? I have some schematics I want to be placed randomly throughout the world on grass.

If you're using mapgen v7, you can let the mapgen do most of the work. If you're placing the schematics manually, try to use pseudorandom or something else that's reproducable in order to avoid situations where parts of your map are created using diffrent parameters.

[philipbenr]

I suppose I will have to write my own v7 magpen. I was hoping I didn't have to, but oh well. If it is easy to do the schematic placing, then why the heck not?

Edit: Got any good references other than paramat's magpens / Yappy?

[Sokomine]

I suppose I will have to write my own v7 magpen. I was hoping I didn't have to, but oh well. If it is easy to do the schematic placing, then why the heck not?

Take a look at the earlier versions of Ethereal (less complex than later versions). The mod uses mapgen v7, and all the structures (trees, vulcanoes, mushrooms, ...) are schematics which are placed automaticly depending on the biome.

[Amaz]

I suppose I will have to write my own v7 magpen. I was hoping I didn't have to, but oh well. If it is easy to do the schematic placing, then why the heck not?

Edit: Got any good references other than paramat's magpens / Yappy?

Here is some example code (With comments) that places schematics in mapgens 7 and 5: https://gist.github.com/Amaz1/54ad76374316e98660fa
Here is some code (Again, with comments) that defines biomes for mgv5&7: https://gist.github.com/Amaz1/eee1efcbf6c483d0e03f

And then there are the dev wiki pages for biomes and decorations: http://dev.minetest.net/minetest.register_biome & http://dev.minetest.net/minetest.register_decoration

Hope this helps!

[philipbenr]

Thanks Sokomine and Amaz. This probably will get things off the ground.

[Hybrid Dog]

Are the .mts and .we schematics the same?

[philipbenr]

Apparently, no. You can convert them yes, but they are not the same.

[Krock]

Best talk to Krock. He's using mapgen parameters on his server which create a relatively (but not absolutely) flat map.

Bad idea. Changing the mapgen params wrongly can cause huge oceans and almost no space for building.
For this I made the yappy mapgen, it creates much flat area and also some hills as a variety.

[Nathan.S]

I know I can do something like this with node_boxes

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node_box = {
      type = "wallmounted",
      wall_top    = {-0.0625, -0.0625, -0.0625, 0.0625, 0.5   , 0.0625},
      wall_bottom = {-0.0625, -0.5   , -0.0625, 0.0625, 0.0625, 0.0625},
      wall_side   = {-0.5   , -0.5   , -0.0625, -0.375, 0.0625, 0.0625},
   },

I want to do the same with meshes, I believe that RBA added support a while back. https://github.com/minetest/minetest/commit/dd4c21c1808acedfbcf8402c09ce9129b6ac31c7 but I can't find any documentation on it. I've tried just replacing the tables of numbers to the names of the meshes, and the game will run and I can place the torches, but nothing shows, save for the illumination.

[Krock]

<snip> I believe that RBA added support a while back. <snip> but I can't find any documentation on it. <snip>

Here you can find a simple use of meshnodes:
https://github.com/RealBadAngel/meshnod ... r/init.lua

[Nathan.S]

<snip> I believe that RBA added support a while back. <snip> but I can't find any documentation on it. <snip>

Here you can find a simple use of meshnodes:
https://github.com/RealBadAngel/meshnod ... r/init.lua

Thanks, but I've already got that part figured out, it's the figuring out how to have two different models, or three, for the same node and the engine will place either the top, bottom, or side that's tripping me up.