Post your modding questions here

[Lejo]

Topic: How to fix #1 bad argument to get_player_by_name (string expected, got userdata)
Reason: I want to make a mod.
More Info:code:

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Code: Select all

minetest.register_tool("blood:victimknife", {
   description = "Victimknife",
   inventory_image = "Victimknife.png",
   on_use = function(player)
         local pname = minetest.get_player_by_name(player)
         pname:set_hp(pname:get_hp()-2)
   end,
})

[Byakuren]

Topic: How to fix #1 bad argument to get_player_by_name (string expected, got userdata)
Reason: I want to make a mod.
More Info:code:

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Code: Select all

minetest.register_tool("blood:victimknife", {
   description = "Victimknife",
   inventory_image = "Victimknife.png",
   on_use = function(player)
         local pname = minetest.get_player_by_name(player)
         pname:set_hp(pname:get_hp()-2)
   end,
})

get_player_by_name takes a string and returns an ObjectRef to the player with that name (or nil if there is no player online with that name). In the on_use callback, player is already an ObjectRef so there is no need to call get_player_by_name on it.

If you would like the player's name, do player:get_player_name() (but it looks like you want the ObjectRef, not the name).

[Lejo]

Topic: How to fix #1 bad argument to get_player_by_name (string expected, got userdata)
Reason: I want to make a mod.
More Info:code:

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Code: Select all

minetest.register_tool("blood:victimknife", {
   description = "Victimknife",
   inventory_image = "Victimknife.png",
   on_use = function(player)
         local pname = minetest.get_player_by_name(player)
         pname:set_hp(pname:get_hp()-2)
   end,
})

get_player_by_name takes a string and returns an ObjectRef to the player with that name (or nil if there is no player online with that name). In the on_use callback, player is already an ObjectRef so there is no need to call get_player_by_name on it.

If you would like the player's name, do player:get_player_name() (but it looks like you want the ObjectRef, not the name).

Ok,
now it looks so:

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Code: Select all

minetest.register_tool("blood:victimknife", {
   description = "Victimknife",
   inventory_image = "Victimknife.png",
   on_use = function(player)
         player:set_hp(player:get_hp()-2)
   end,
})

And I get the Error: attempt to call method 'get_hp' (a nil value)

[D00Med]

maybe try using:
local hp = player:get_hp()
player:set_hp(hp-2)

[mr_dean]

Topic: Game crashing when I run a mod.
Reason: I am trying to modify a mod I made, but now it crashes w/out a error.
Info: So, I made a mod, (random_foods, look it up, WIP mods) I decided to edit it and add some stuff, but now it will not load. the game just stops working, and there's no error message, just a windows message saying that the application has stopped working, and to close it. Here is the code:

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Code: Select all

 minetest.register_craftitem("custom_food:mudsoup", {
   description = "Mud Soup",
   inventory_image = "food_mudsoup_bowl.png",
   on_use = minetest.item_eat(2)
})

minetest.register_craftitem("custom_food:woodbowl", {
   description = "Wood Bowl",
   inventory_image = "food_woodbowl.png"
})

minetest.register_craftitem("custom_food:cake", {
   description = "Cake",
   inventory_image = "food_cake.png",
   on_use = minetest.item_eat(4)
})

minetest.register_craftitem("custom_food:cooked_mushroom", {
   description = "Cooked Mushroom",
   inventory_image = "cooked_mushroom.png",
    on_use = minetest.item_eat(3)
})

--The added item

minetest.register_craftitem("custom_food:mushroom_stew", {
    discription = "Mushroom Stew",
   inventory_image = "mushroom_stew.png",
   on_use = minetest.item_eat(5)
})

minetest.register_craftitem("custom_food:sugar", {
   description = "Sugar",
   inventory_image = "items_sugar.png",
   on_use = minetest.item_eat(0.5)
})

minetest.register_node("custom_food:sugarweed", {
   description = "Sugar Weed",
   tiles = {"sugarweed.png"},
   groups = {choppy=1, oddly_breakable_by_hand=1,  plantlike=1, flamable=5,
   flora=1},
   drawtype = "plantlike",
   walkable = false,
   buildable_to = true,
   sunlight_propagates = true,
   paramtype = "light",
})

minetest.register_abm({
   nodenames = {"default:dirt_with_grass"},
   neighbors = {"default:water_source", "default:water_flowing"},
   interval = 10.0, -- Run every 10 seconds
   chance = 1000, -- Select every 1 in 1000 nodes
   action = function(pos, node, active_object_count, active_object_count_wider)
      minetest.set_node({x = pos.x, y = pos.y + 1, z = pos.z}, {name = "custom_food:sugarweed"})
   end
})

--===================CRAFTING==================--
minetest.register_craft({
   output = "custom_food:woodbowl",
   recipe = {
      {"group:wood", "", "group:wood"},
      {"", "group:wood", ""},
      {"", "", ""}
   }
})
--mud soup:

minetest.register_craft({
   output = "custom_food:mudsoup",
   recipe = {
      {"default:leaves", "default:dirt", "flowers:mushroom_brown"},
      {"", "custom_food:woodbowl", ""},
      {"", "", ""}
   }
})
-- cooked mushroom (red mushrooms only! removes poison efect.)
minetest.register_craft ({
    type = "cooking",
   cooktime = 15,
    output = "custom_food:cooked_mushroom",
   recipe = "flowers:mushroom_red",
})
-- Cakes!
minetest.register_craft({
   output = "custom_food:cake",
   recipe = {
      {"custom_food:cooked_mushroom", "custom_food:sugar", "flowers:mushroom_brown"},
      {"", "farming:bread", ""},
      {"", "", ""}
   }
})
-- Sugar. (replaces my original idea of papyrus in the cake recepie.)
minetest.register_craft ({
    type = "cooking",
   cooktime = 25,
    output = "custom_food:sugar",
   recipe = "custom_food:sugarweed",
})

--The crafting reci for it.

-- Mushroom Stew, still working on bugs.
minetest.register_craft ({
    output = "custom_food:mushroom_stew",
    recepie = {
        {"custom_food:cooked_mushroom", "farming:wheat", "flowers:mushroom_brown"},
      {"", "custom_food:woodbowl", ""},
      {"", "", ""},
   }
})


[Nyarg]

Topic: Game crashing

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Code: Select all

 
...
    discription = "Mushroom Stew",
...
    recepie = {
...


[mr_dean]

Topic: Game crashing

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Code: Select all

 
...
    discription = "Mushroom Stew",
...
    recepie = {
...


Are you saying that this is where my errors are, or just check those?

[Nyarg]

Are you saying that this is where my errors are, or just check those?

First I am checking and found "discription " then I copy code in to MT correct one and anyway get fail without any errors.
Then I take Occam's razor and cut code half by half and finally found block with "recepie". then fix it and obtain profit )

[mr_dean]

Oh, ok I see now, sorry, I just wasn't getting what you were saying, thx!

[DS-minetest]

(It's called recipe and description.)
As much as I know it isn't possible to give 1/4 hearts like you did with sugar.

[BrunoMine]

Is there a way to check if a specific coordinate is curled with a collisionbox?

For example:

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pos1 = {x=0, y=0.0, z=0}
pos2 = {x=0, y=0.1, z=0}
pos3 = {x=0, y=0.2, z=0}
pos4 = {x=0, y=0.3, z=0}
pos5 = {x=0, y=0.4, z=0}


Is it possible to know which of these coordinates collide with the collisionbox at (0, 0, 0)?

[Lejo]

maybe try using:
local hp = player:get_hp()
player:set_hp(hp-2)

I still get the same Error :(

[Nyarg]

I still get the same Error :(

Quick search gives different for on_use = ...

+ Spoiler

[BirgitLachner]

I want to start a Mod called "TeacherTools" that should make it easy for Teachers to handle a group of pupils on a server with some clicks and without the need to enter code.

For that I want to know:
- How can I get a list of all the users that are online?
- An other possibility ... can I read from inside the game the player that have been signed in once and "see" their privs to filter them?
... If you know a mod tnat already does something like that would be nice.

- How do I execute a text commond with a button?

At first I'm sure that I will not be able to have a list of players and for everyone buttons to ban, freeze or whatever I want to do with him. First idea is to have a textfield to enter a name and the buttons behind the textfield to do everything with him.

Thanks for all hints and informations about already existing Mods.

[DS-minetest]

@Lejo:
Jep, the player should be the user in "on_use = func(itemstack, user, pointed_thing)". => It has to be written on 2nd place:

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Code: Select all

    minetest.register_tool("blood:victimknife", {
       description = "Victimknife",
       inventory_image = "Victimknife.png",
       on_use = function(itemstack,player)
             local hp = player:get_hp()
             player:set_hp(hp-2)
       end,
    })


[TumeniNodes]

How can I add particles to a node on punching?
where do I start?

ex: I want to add smoke/dust-like particles to stone_with_coal while being mined... (well, that just gave away the whole surprise :P )

and, do the particles only have a certain behavior (like flowing up) or are they fairly code-able to float down as well and maybe set up a next function which calls in a texture/item which would be a small pile of coal dust? which can then be picked up and used in a recipe

[D00Med]

Use on_destruct or on_dig, and use this for the particles:

minetest.add_particlespawner({
amount = 1,
time = 1,
minpos = {x=0, y=0, z=0},
maxpos = {x=0, y=0, z=0},
minvel = {x=0, y=0, z=0},
maxvel = {x=0, y=0, z=0},
minacc = {x=0, y=0, z=0},
maxacc = {x=0, y=0, z=0},
minexptime = 1,
maxexptime = 1,
minsize = 1,
maxsize = 1,
collisiondetection = false,
vertical = false,
texture = "image.png",
playername = "singleplayer" -- probably best to get rid of this
})

[TumeniNodes]

Use on_destruct or on_dig, and use this for the particles:

minetest.add_particlespawner({
amount = 1,
time = 1,
minpos = {x=0, y=0, z=0},
maxpos = {x=0, y=0, z=0},
minvel = {x=0, y=0, z=0},
maxvel = {x=0, y=0, z=0},
minacc = {x=0, y=0, z=0},
maxacc = {x=0, y=0, z=0},
minexptime = 1,
maxexptime = 1,
minsize = 1,
maxsize = 1,
collisiondetection = false,
vertical = false,
texture = "image.png",
playername = "singleplayer" -- probably best to get rid of this
})

awesome... I'll give it a try. Thanks!

[Lejo]

@DS-minetest Thanks now it works.

[orwell]

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Code: Select all

minetest.add_particlespawner({
   amount = 1,
   time = 1,
   minpos = {x=0, y=0, z=0},
   maxpos = {x=0, y=0, z=0},
   minvel = {x=0, y=0, z=0},
   maxvel = {x=0, y=0, z=0},
   minacc = {x=0, y=0, z=0},
   maxacc = {x=0, y=0, z=0},
   minexptime = 1,
   maxexptime = 1,
   minsize = 1,
   maxsize = 1,
   collisiondetection = false,
   vertical = false,
   texture = "image.png",
})

remember to change the min/max values
each particle spawned will get a random pos/vel/acc from that range
with the setup as above every particle starts at 0,0,0, does not move, has a size of 1 and exists for exactly 1s.

[GreenDimond]

Technic question (which it seem no one wants to answer on the Technic thread):
I need to replace a grinder recipe

[TumeniNodes]

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Code: Select all

minetest.add_particlespawner({
   amount = 1,
   time = 1,
   minpos = {x=0, y=0, z=0},
   maxpos = {x=0, y=0, z=0},
   minvel = {x=0, y=0, z=0},
   maxvel = {x=0, y=0, z=0},
   minacc = {x=0, y=0, z=0},
   maxacc = {x=0, y=0, z=0},
   minexptime = 1,
   maxexptime = 1,
   minsize = 1,
   maxsize = 1,
   collisiondetection = false,
   vertical = false,
   texture = "image.png",
})

remember to change the min/max values
each particle spawned will get a random pos/vel/acc from that range
with the setup as above every particle starts at 0,0,0, does not move, has a size of 1 and exists for exactly 1s.

Thanks orwell.
Yeh, I'm still stuttering with how to use this, I've made several changes..., switched from destruct to dig, etc... and have yet to see a particle.
I'll try to figure it out some more, before I fold and ask here again...

Sometimes I'll be working on some code and end up making changes in another copy, rather than the one I am currently using and go bezerk till I finally realize...... "Ohhhhhhh...... yeh...." "/ :D

[hajo]

I want to start a Mod called "TeacherTools" .. to handle a group of pupils on a server with some clicks ..
- How can I get a list of all the users that are online?

/status ?

- How do I execute a text commond with a button?
Thanks for all hints and informations about already existing Mods.

Have a look at
* morecommands (e.g. /getpos and /sudo)
* sfinv - "Simple Fast Inventory"
* sfinv_buttons - "Simple Fast Inventory Buttons"
* Sfinv Unified Inventory - "Adds unified inventory features to sfinv" as how-to
Also:
* admintoys - /freeze

[Muuus]

Hi there,

I'm new to Minetest and the world of modding, trying to get a grasp over things like formspec, I started creating a mod with a mixer utilitary block, adding new kind of recipes, based on the furnace. I'm basing that on the furnace, so I want a similar GUI, but with a water drop in place of the fire and two slots for src instead of only one. Also, I want to use 'liquid' instead of 'fuel', like putting a water bucket inside the mixer in the 'liquid (ex-'fuel') slot, and then transforming sand and gravel in the src slots into a new block like concrete.

What I'm asking myself, is if it's possible to do that without touching the .cpp files, but only as LUA mod ? I mean, I saw that some of the variable like fuel_totaltime or fuel_time are also used in some .cpp file, so I was wondering if I could do something similar to the furnace_node_timer function for my mixer, without touching the Minetest engine and the .cpp/.h files ?

Sorry if I couldn't make myself clear enough, hope you can help me on that one.

[hajo]

I started creating a mod with a mixer utilitary block,
adding new kind of recipes, based on the furnace. ..
but with a water drop in place of the fire and two slots for src instead of only one. ..
do that .. only as LUA mod ?

Have a look at the mod basic_machines, there is a constructor
that builds all the other machines of that mod.

Also, craftingtable...

[orwell]

Hi there,

I'm new to Minetest and the world of modding, trying to get a grasp over things like formspec, I started creating a mod with a mixer utilitary block, adding new kind of recipes, based on the furnace. I'm basing that on the furnace, so I want a similar GUI, but with a water drop in place of the fire and two slots for src instead of only one. Also, I want to use 'liquid' instead of 'fuel', like putting a water bucket inside the mixer in the 'liquid (ex-'fuel') slot, and then transforming sand and gravel in the src slots into a new block like concrete.

What I'm asking myself, is if it's possible to do that without touching the .cpp files, but only as LUA mod ? I mean, I saw that some of the variable like fuel_totaltime or fuel_time are also used in some .cpp file, so I was wondering if I could do something similar to the furnace_node_timer function for my mixer, without touching the Minetest engine and the .cpp/.h files ?

Sorry if I couldn't make myself clear enough, hope you can help me on that one.

Have a look at /games/minetest_game/default/furnace.lua and try to figure out how it works there, then do your modifications.
I'll explain the concepts of formspecs to you:

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"size[8,8.5]"..
   "list[current_name;src;2.75,0.5;1,1;]"..
   "list[current_name;fuel;2.75,2.5;1,1;]"..
   "image[2.75,1.5;1,1;default_furnace_fire_bg.png]"..
   "image[3.75,1.5;1,1;gui_furnace_arrow_bg.png^[transformR270]"..
   "list[current_name;dst;4.75,0.96;2,2;]"..
   "list[current_player;main;0,4.25;8,1;]"..
   "list[current_player;main;0,5.5;8,3;8]"..
   "listring[current_name;dst]"..
   "listring[current_player;main]"..
   "listring[current_name;src]"..
   "listring[current_player;main]"


This is a typical formspec definition. It's just one long string, the quotes and concat dots (..) are just for better readability, because you can't insert newlines in lua strings*. It defines the entire GUI for an inactive furnace. For example, image[...] draws an image at this screen position and list[...] shows an inventory list (or a single slot).
See the lua_api.txt section "Formspecs" for details on what works how.
'doc/lua_api.txt' will help you in a lot of places.

Furnace 'on_construct' callback:

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on_construct = function(pos)
--get the metadata of the node (a key-value-store and an inventory)
      local meta = minetest.get_meta(pos)
      meta:set_string("formspec", inactive_formspec)
--you can put any data into the metadata, like percentage of items processed. See "NodeMetaRef"
--but the key 'formspec' is reserved for the formspec to be show when the node is right-clicked.
      local inv = meta:get_inventory()
--get the node's inventory and set the sizes of the inventory list. See lua_api.txt section "InvRef"
      inv:set_size('src', 1)
      inv:set_size('fuel', 1)
      inv:set_size('dst', 4)
   end,

On fuel stuff in cpp files: irrelevant. Possibly for compatibility with very old minetest worlds...

* you can by using [[this string
has newlines
in it.]], but this does not look pretty.

[orwell]

On "fuel" in cpp files:
- "fuel_totaltime" is contained in a function called

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static bool content_nodemeta_deserialize_legacy_body(..)

and its only job is to transfer the old meta serialization format into the key-value-store that can be and is accessed from LUA.

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meta->setString("fuel_totaltime", ftos((float)temp/10));

-----
It appears in some places around the "register_craft" API function. The crafting definitions are saved in the engine, also the ones for the furnace. But you just have to save your crafting definitions inside a lua table.
The minetest_game furnace reads the recipe at line 121 of furnace.lua:

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local cooked, aftercooked = minetest.get_craft_result({method = "cooking", width = 1, items = srclist})
   

It handles the rest on the lua side.
So don't worry, everything is achievable without even looking at the cpp code.

[hajo]

I have a small mod that shows the ingame-time in the HUD.
This works fine in singleplayer, but not when playing on a server.

The mod doesn't affect the world on the server, or items, or anything,
so it should be no problem if I run this mod with multiplayer too.

How can I set this mod to load&run every time I enter a game ?

[player_legend]

Is there a best way to control the player's physics in a function? I have an idea to implement Quake like strafe jumping and that requires direct control of the player's movement. I'm just introducing myself to this engine, but from what I've read so far, it seems I could regularly poll the player's inputs and do what modifications to their velocity I need to using my own function. Would this work well or would it cause problems with prediction in the netcode or something.

[Byakuren]

Is there a best way to control the player's physics in a function? I have an idea to implement Quake like strafe jumping and that requires direct control of the player's movement. I'm just introducing myself to this engine, but from what I've read so far, it seems I could regularly poll the player's inputs and do what modifications to their velocity I need to using my own function. Would this work well or would it cause problems with prediction in the netcode or something.

You can't modify a player's velocity, and it would work terribly anyway because there would be no prediction and velocity changes would have the lag of a roundtrip (actually longer because controls are only sent periodically, not on every change).

This might be something doable when client-side scripting comes, because then it will be possible to make an API where you can get the current controls and set velocity with no lag.