Post your modding questions here

[Nyarg]

I need help.

I create simple entity.
Now I need add to instance some metadata. How I may to do it ?
Next line I need read metadata. How I may to do it ?

like at concept

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Code: Select all

minetest.register_on_punchnode
  minetest.add_entity(proto)   --- instance 1 of proto
  minetest.add_entity(proto)   --- instance 2
  ??? add some meta into instance 1
  ??? add some different meta into instance 2
  ??? read added meta from instance 1
end


[Napiophelios]

it just didn't seem to work with minetest.add_node
works fine with minetest.place_node

add_node ignores any placement defaults, so you have to do

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Code: Select all

minetest.add_node(pos, {name = "plant:name", param2 = 1})

instead.

Thank You :)

[DS-minetest]

@Nyarg:

• give the entities names:
  
  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

      minetest.register_on_punchnode
      a = minetest.add_entity(proto)   --- instance 1 of proto
      b = minetest.add_entity(proto)   --- instance 2
      ??? add some meta into a
      ??? add some different meta into b
      ??? read added meta from a
    end


  
  
• as much as i know you cant save metadata in entities but you could save something in staticdata

[orwell]

I need help.

I create simple entity.
Now I need add to instance some metadata. How I may to do it ?
Next line I need read metadata. How I may to do it ?

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

minetest.register_on_punchnode
  minetest.add_entity(proto)   --- instance 1 of proto
  minetest.add_entity(proto)   --- instance 2
  ??? add some meta into instance 1
  ??? add some different meta into instance 2
  ??? read added meta from instance 1
end


add_entity() returns an ObjectRef

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local object=minetest.add_entity(pos, name)

You can get it's luaentity (the lua table that is "self" in entity functions)

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local luaentity=object:get_luaentity()

now you can write stuff into it.

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luaentity.foo="bar"
print(luaentity.bababap)

[DS-minetest]

is there a way to give two or more different textures to an entities with mesh at once, some sides the one texture, some the other one?

yes, as long as the model has the proper 2 materials defined. Use `textures = { texture1, texture2},` (off the top of my head)

That is correct

I would guess most models used in Minetest (think mobs) only contain one material though. A work around could be to overlay another texture to add something. For example if you wanted to give Sam a black eye, you would assign character.png^black_eye.png

The black eye texture would be exactly the same size as character.png. It would be transparent with a black eye drawn where Sams eye would be.

thanks for the answers but im a bit confused in materials

[D00Med]

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Code: Select all

local minp = {x=pos.x-5, y=pos.y, z=pos.z-5}
local maxp = {x=pos.x+5, y=pos.y, z=pos.z+5}
local doors = minetest.find_nodes_in_area(minp, maxp, "group:door")
for i = 1, #doors do
   local dpos = {x=doors[i].x, y=doors[i].y, z=doors[i].z}
   local door = doors.get(dpos)
   door:toggle(player)
end


Why does this keep crashing the game? I get this error: "attempt to call field 'get' (a nil value)"
It doesn't happen when there is no door in the area. I did get it to work after using only one position.

[Nyarg]

error: "attempt to call field 'get' (a nil value)"

??? doors:get(dpos) VS doors.get(dpos) VS doors.get[dpos]

[D00Med]

doors:get(dpos) won't work, it isn't a real method.
doors.get[dpos] I don't know, I'm pretty sure square brackets can't be used for that sort of thing.
The code, by the way, was mostly copied from xdecor, and it worked fine for that.

[sofar]

Why does this keep crashing the game? I get this error: "attempt to call field 'get' (a nil value)"

Did you forget to add `doors` to `depends.txt` ?

[TumeniNodes]

Why does this keep crashing the game? I get this error: "attempt to call field 'get' (a nil value)"

Did you forget to add `doors` to `depends.txt` ?

ehem... speaking of doors. Would anyone be able to give the nodebox/selection box coords to set doors to the center of blocks, and when open they come a bit into the next node space?
I realize not many like the idea but I would like it for personal use and I do not know how to use the / positions I'm to used to 0.5 type positions.
I already tried it a few times and cannot get it to work, I think mainly due to the hidden part for the hinges.
I also realize some may feel this will break things but I will take full blame on myself if it does :P

[sofar]

ehem... speaking of doors. Would anyone be able to give the nodebox/selection box coords to set doors to the center of blocks, and when open they come a bit into the next node space?
I realize not many like the idea but I would like it for personal use and I do not know how to use the / positions I'm to used to 0.5 type positions.
I already tried it a few times and cannot get it to work, I think mainly due to the hidden part for the hinges.
I also realize some may feel this will break things but I will take full blame on myself if it does :P

it's entirely possible - this is how the fence gate works. But yes, the top door part is an issue, you'll have to make a top door half to create the proper collision box.

[TumeniNodes]

ehem... speaking of doors. Would anyone be able to give the nodebox/selection box coords to set doors to the center of blocks, and when open they come a bit into the next node space?
I realize not many like the idea but I would like it for personal use and I do not know how to use the / positions I'm to used to 0.5 type positions.
I already tried it a few times and cannot get it to work, I think mainly due to the hidden part for the hinges.
I also realize some may feel this will break things but I will take full blame on myself if it does :P

it's entirely possible - this is how the fence gate works. But yes, the top door part is an issue, you'll have to make a top door half to create the proper collision box.

Thank you sofar, I'll give it a try again.

[D00Med]

Did you forget to add `doors` to `depends.txt` ?

Nope, it's there.

[DS-minetest]

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

local minp = {x=pos.x-5, y=pos.y, z=pos.z-5}
local maxp = {x=pos.x+5, y=pos.y, z=pos.z+5}
local doors = minetest.find_nodes_in_area(minp, maxp, "group:door")
for i = 1, #doors do
   local dpos = {x=doors[i].x, y=doors[i].y, z=doors[i].z}
   local door = doors.get(dpos)
   door:toggle(player)
end


Why does this keep crashing the game? I get this error: "attempt to call field 'get' (a nil value)"
It doesn't happen when there is no door in the area. I did get it to work after using only one position.

maybe you should name the table not doors, like 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

local minp = {x=pos.x-5, y=pos.y, z=pos.z-5}
local maxp = {x=pos.x+5, y=pos.y, z=pos.z+5}
local doorss = minetest.find_nodes_in_area(minp, maxp, "group:door")
for i = 1, #doorss do
   local dpos = {x=doorss[i].x, y=doorss[i].y, z=doorss[i].z}
   local door = doors.get(dpos)
   door:toggle(player)
end


[Hybrid Dog]

Alternatively you could use following:
local door = _G.doors.get(dpos)

[JackWilliam]

Topic: How to add texture
Reason: I have an error
More Info(optional): hello everyone . I followed the tutorial but I don't understand. I call the image tutorial_decowood end the code is that :

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Code: Select all

minetest.register_node("tutorial:decowood", {
   tile_images = {"tutorial_decowood.png"},
   groups={level=1},
})

and the error is :

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ERROR[main]: generateImage(): could not load image "tutorial_decowood.png" while building texture
ERROR[main]:  generateImage(): Creating a dummy image for "tutorial_decowood.png"

Can anyone help me?

[sofar]

maybe you should name the table not doors

ahh yeah, I didn't spot that error. You just overwrote the `doors` global this way.

This kind of programming stuff can be found by luacheck. I strongly recommend you start learning how to use it - it really helps you find bugs early.

[D00Med]

Oh ok, thankyou

[DS-minetest]

@JackWilliam:
as you can see in lua_api.txt line 3713:

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tiles = {tile definition 1, def2, def3, def4, def5, def6}, --[[
^ Textures of node; +Y, -Y, +X, -X, +Z, -Z (old field name: tile_images)
^ List can be shortened to needed length ]]

=> its called "tiles", not "tile_images"

[JackWilliam]

thanks DS-minetest, I have modified the code, but the error is still there.
the node in game is like this:

error.PNG (757.56 KiB) Viewed 7190 times

and the color change when I restart minetest or when I try to mine the node.

[Krock]

and the color change when I restart minetest or when I try to mine the node.

This error happens when the texture could not be found.
Check or create a texture at the location mods/tutorial/textures/tutorial_decowood.png. Make sure it's exactly that path, otherwise Minetest will not be able to find the texture.

[Tmanyo]

Is there a way to tie detached inventories into meta data?

[JackWilliam]

This error happens when the texture could not be found.
Check or create a texture at the location mods/tutorial/textures/tutorial_decowood.png. Make sure it's exactly that path, otherwise Minetest will not be able to find the texture.

Yes I know but the path is correct. Can be the editor?? I use Geany.

[Napiophelios]

try making a folder in the texture pack directory and place the image there too.
then select your new "texture pack" when you start the game.

Almost every time I get this error it's because I mispelt something somewhere.

[Nyarg]

as much as i know you cant save metadata in entities but you could save something in staticdata

It's looks like metadata ~= staticdata ?

... ObjectRef
... get it's luaentity (the lua table that is "self" ...)
... write stuff into it.

Thank you all now it works )
But little question still yet. What exactly data of entity will be saved in world file when server shutdown ?
Is wiki have somewhere the explanation what data structures will be save ?

Some mods and get_staticdata() seems like only scripter need carry about save and init each entity with unique data.

[DS-minetest]

to save data from the entity for the next load you use the get_staticdata function
return <what you need (only strings, to make tables to strings use minetest.de-/serialize, note: this doesnt work with userdata)>
then write into the on_activate(self, staticdata, dtime_s)
and use staticdata as the returned string

[ManElevation]

can some one write a block lua script. just a plain block
with a {"front.png"} a {"side.png"} and a {"top.png"} {"back.png"}

a full one pleas

[Napiophelios]

can some one write a block lua script. just a plain block
with a {"front.png"} a {"side.png"} and a {"top.png"} {"back.png"}
a full one pleas

test_node.zip

basic block nodes

(124.31 KiB) Downloaded 181 times

basic_blocks.png (174.38 KiB) Viewed 7190 times

[GreenDimond]

For my Sandplus Mod, I would like to add an ability to have a recipe canceled and replaced with a grinder recipe if the technic mod is enabled. I know I would have to use something along the lines of "if minetest.get_modpath("technic") then...", and somewhere in there the technic grinding recipe (table.insert(recipes, {"modname:node1", "modname:node2"})), but I don't know how to do this. Help?
EDIT: I think I got it :P

[BrunoMine]

Is there a way to track the status of a player?

For example, if the player is in a car, bed, boat, helicoter and others.

Is there a unified way of checking this sort of thing?
I'd like to know how to control these things to prevent a player from being able to make and control multiple cars simultaneously, or even crash the server.