Post your modding questions here

[rubenwardy]

Meta entries have no type, everything is saved as string. So set_int(1) is the same as set_string("1")

And get_int does tonumber(get_string(k))

[pithy]

What in the world are "special_tiles" in the node def?

[KCoombes]

What in the world are "special_tiles" in the node def?

http://dev.minetest.net/minetest.register_node

special_tiles — Specifies certain textures used in things like texture animations. (like flowing liquids)

[KCoombes]

I'm having a hard time with writing an on_punch function - can someone look this over and tell me where I goofed?

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

on_punch = function(pos, node, puncher)
      local name = puncher:get_player_name()
      local inv = meta:get_inventory()
      if inv:is_empty("src") then
         minetest.chat_send_player(name,"It is empty!")
         return true
      elseif not inv:is_empty("dst") then
         minetest.chat_send_player(name,"It is full!")
         return true
      end
      return true
end

Both 'src' and 'dst' are 3x3 in the formspec, and this is just a pre-usage check of the item - but I can't get this part to work properly. Any help would be appreciated!

[everamzah]

local inv = meta:get_inventory()

What meta are you getting? Try get_inventory(pos).

[KCoombes]

Tried that - nope, still won't talk to me. Tried this change to 'return', based on the (working) can_dig function:

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

   on_construct = function(pos)
      local meta = minetest.env:get_meta(pos)
      meta:set_string("formspec",formspec)
      meta:set_string("infotext", "It!")
      local inv = meta:get_inventory()
      inv:set_size("src", 9)
      inv:set_size("dst", 9)
   end,
   can_dig = function(pos,player)
      local meta = minetest.env:get_meta(pos);
      local inv = meta:get_inventory()
      if not inv:is_empty("src") then
         return false
      elseif not inv:is_empty("dst") then
         return false
      end
      return true
   end,
})

[ABJ]

Hi, I want to ask a bunch of questions, but I don't want to interrupt the current discussion. Sorry if this looks like spam. I will post more when this problem is laid to rest.

[pithy]

What in the world are "special_tiles" in the node def?

http://dev.minetest.net/minetest.register_node

special_tiles — Specifies certain textures used in things like texture animations. (like flowing liquids)

all that link says about special_tiles is "This text needs further expansion"

[ABJ]

That is one of the most annoying things in a wiki. Just as you think you're finally gonna figure out what this awesome function does, BAM! Stub.
I really wish and hope that somebody who is knowledgeable in this field and has the explaining skills of rubenwardy would expand all those incomplete wiki pages (and ruben's book btw).

[everamzah]

minetest.env is deprecated
on_construct is not where to do node metadata manipulation, only to initialize. Use on_place or after_place_node instead.

[KCoombes]

minetest.env is deprecated --changed to minetest.
on_construct is not where to do node metadata manipulation, only to initialize. Use on_place or after_place_node instead.

--changed to on_place

This is now working - thanks for your help!

[TumeniNodes]

After exporting an obj from NBE, you should take it to a UV wrapping program such as Blender. If you don't need to UV wrap it, just export it as a node box

I just created a 3x5 node..., ummm,node using NBE, and it works just fine without even using the .obj models anywhere... just the dimensions which NBE produced.
The only issue I am having at the moment, is figuring out why I fall through it when I walk over it... yet I cannot pass through it if it is placed upright, or from the sides either upright or laying down?
Other than that issue, everything else works fine, just a simple 16x16px texture repeats on it well.

I wonder if I add the .obj models if that will solve my falling through problem when walking over the large node?

[pithy]

After exporting an obj from NBE, you should take it to a UV wrapping program such as Blender. If you don't need to UV wrap it, just export it as a node box

I just created a 3x5 node..., ummm,node using NBE, and it works just fine without even using the .obj models anywhere... just the dimensions which NBE produced.
The only issue I am having at the moment, is figuring out why I fall through it when I walk over it... yet I cannot pass through it if it is placed upright, or from the sides either upright or laying down?
Other than that issue, everything else works fine, just a simple 16x16px texture repeats on it well.

I wonder if I add the .obj models if that will solve my falling through problem when walking over the large node?

A .obj does not have a collision_box.

[rubenwardy]

After exporting an obj from NBE, you should take it to a UV wrapping program such as Blender. If you don't need to UV wrap it, just export it as a node box

I just created a 3x5 node..., ummm,node using NBE, and it works just fine without even using the .obj models anywhere... just the dimensions which NBE produced.
The only issue I am having at the moment, is figuring out why I fall through it when I walk over it... yet I cannot pass through it if it is placed upright, or from the sides either upright or laying down?
Other than that issue, everything else works fine, just a simple 16x16px texture repeats on it well.

I wonder if I add the .obj models if that will solve my falling through problem when walking over the large node?

By dimension it produced, do you mean the node box export? You don't have to copy the co-ords manually, you could use file > export > standalone lua file

[TumeniNodes]

By dimension it produced, do you mean the node box export? You don't have to copy the co-ords manually, you could use file > export > standalone lua file

Exactically... :D
Yes, I already use that feature but, since I am throwing it into a mod with a few other items..., what I normally do is this:
export standalone Lua, then export ,obj, and then save project as...
I then copy the node dimensions into my init.lua code.
Just recently with this mod..., I import the .obj into Blender, fix the normals (if needed), set textures if required, etc., export the new.obj, and save as a .blend and put them both into the models folder, whether needed or not..., so that they are available as part of the source, for others to tinker with, if they desire, in the future. (it seems like a good idea to me that this should be normal practice)

The only issue I have had with NBE (which is a minor issue) is when opening a past .nbe file..., the nodes are offset and when you click to drag they jump. I have been able to manage the problem, myself but... sometimes it can be an annoyance.

[TumeniNodes]

What in the world are "special_tiles" in the node def?

http://dev.minetest.net/minetest.register_node

special_tiles — Specifies certain textures used in things like texture animations. (like flowing liquids)

all that link says about special_tiles is "This text needs further expansion"

They also often have a comment, mentioning "mostly unused" :P

[TumeniNodes]

A .obj does not have a collision_box.

right so... is it possible to then activate the .obj "drawtype = mesh
and then, set the entire object dimensions as "collision_box"
and then set the selection_box dimension in a small convenient location on the object?
Would that work so I can finally walk across this danged thing without falling through it?

[KCoombes]

A .obj does not have a collision_box.

right so... is it possible to then activate the .obj "drawtype = mesh
and then, set the entire object dimensions as "collision_box"
and then set the selection_box dimension in a small convenient location on the object?
Would that work so I can finally walk across this danged thing without falling through it?

Yes, as long as you set walkable = true in the node definition

[ozkur]

Topic: Can you build high enough to have your blocks not cast shadows??
Reason: I want to make another dimesion(and possibly more than just one). I'm hoping to stack one on top the other, but i don't know how high or even if i can do so.

[Krock]

Topic: Can you build high enough to have your blocks not cast shadows??

You must teleport yourself about 1000 nodes up or down and build there (try using WorldEdit, it really helps). This distance is to make sure that the mapblocks in between are not generated/loaded so the light can not be updated there.

[ozkur]

Topic: Can you build high enough to have your blocks not cast shadows??

You must teleport yourself about 1000 nodes up or down and build there (try using WorldEdit, it really helps). This distance is to make sure that the mapblocks in between are not generated/loaded so the light can not be updated there.

Thanks!

[KCoombes]

InvRef question:

remove_item("listname", stack)
take as many items as specified from the list, returns the items that were actually removed (as an ItemStack)

Ok, so this means 'take as many (items = stack) as specified from the (list = listname) - what is the 'as specified' part?
and what exactly does 'returns the items that were actually removed' mean? Gives the items back? Seems counter to the process of removing the item in the first place!

[Krock]

Iwhat exactly does 'returns the items that were actually removed' mean? Gives the items back?

It removes the specified stack from a collection of stacks (= list)

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 stack = "default:stick 3"
-- OR: stack = ItemStack("default:stick 3")

-- Try to remove the items specified in "stack" from the list "main"
local removed_items = inv:remove_item("main", stack)
if removed_items:get_count() < stack:get_count() then
   -- Failed to remove all items: Removed only "removed_items:get_count()" of them
end


[Byakuren]

InvRef question:

remove_item("listname", stack)
take as many items as specified from the list, returns the items that were actually removed (as an ItemStack)

Ok, so this means 'take as many (items = stack) as specified from the (list = listname) - what is the 'as specified' part?
and what exactly does 'returns the items that were actually removed' mean? Gives the items back? Seems counter to the process of removing the item in the first place!

The method returns an ItemStack of the things that were removed. Not returning to the inventory, returning as in calling the method evaluates to the ItemStack.

[ozkur]

is there a way to make it so that if you step on something it replaces it self with a different block?
i want to make it so that you can step on a block, and it will have foot prints

[KCoombes]

This code works, kinda - the 'dst' is 3x3, while the code reads only the first slot - how can I make it read all the slots?

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

      if inv:is_empty("src") then
         minetest.chat_send_player(name,"It is empty!")
      elseif not inv:is_empty("dst") then
         minetest.chat_send_player(name,"It is full!")
      end


[everamzah]

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

for _, v in pairs(inv:get_list("src")) do
  print(v)
end


That might not actually work, I'm terrible with for loops.

Myself, I'm trying to throw a ball. I'm cheating a bit because I haven't looked anything up yet, but if anyone wants to clue me in on how to adjust velocity/acceleration to mimic a small heavy object, please do!

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 def = {
   name = "grenade:explosion",
   description = "Grenade Explosion (you hacker you!)",
   radius = 3,
   tiles = {
      side = "default_dirt.png",
      top = "default_dirt.png",
      bottom = "default_dirt.png",
      burning = "default_dirt.png"
   },
}

tnt.register_tnt(def)



minetest.register_craftitem("grenade:grenade", {
   description = "Grenade",
   inventory_image = "default_coal_lump.png",
   on_use = function(itemstack, user, pointed_thing)
      local v = user:get_look_dir()
      local pos = user:getpos()
      pos.y = pos.y + 1.2

      local obj = minetest.add_entity(pos, "grenade:grenade")
      obj:setvelocity({x = v.x * 4, y = v.y * 2 + 4, z = v.z * 4})
      obj:setacceleration({x = v.x / 4, y = v.y / 2 - 4, z = v.z / 4})

      itemstack:take_item()
      return itemstack
   end,
})

minetest.register_entity("grenade:grenade", {
   physical = true,
   collide_with_objects = true,
   weight = 5,
   textures = {"default_coal_lump.png"},
   on_activate = function(self, staticdata)
      self.timer = 0
   end,
   on_step = function(self, dtime)
      local acc = self.object:getacceleration()
      self.object:setacceleration({x = acc.x * 2 / 4, y = acc.y, z = acc.z * 2 / 4})

      self.timer = self.timer + dtime
      if self.timer > 4 then
         tnt.boom(self.object:getpos(), def)
      end
   end,
})


https://github.com/everamzah/grenade

[Hasan]

Hello, is it possible to get the node direction as a number, example: the node direction at the point (0,0,0) is (-270)
is it possible to get this?

[Byakuren]

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

for _, v in pairs(inv:get_list("src")) do
  print(v)
end


That might not actually work, I'm terrible with for loops.

Myself, I'm trying to throw a ball. I'm cheating a bit because I haven't looked anything up yet, but if anyone wants to clue me in on how to adjust velocity/acceleration to mimic a small heavy object, please do!

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 def = {
   name = "grenade:explosion",
   description = "Grenade Explosion (you hacker you!)",
   radius = 3,
   tiles = {
      side = "default_dirt.png",
      top = "default_dirt.png",
      bottom = "default_dirt.png",
      burning = "default_dirt.png"
   },
}

tnt.register_tnt(def)



minetest.register_craftitem("grenade:grenade", {
   description = "Grenade",
   inventory_image = "default_coal_lump.png",
   on_use = function(itemstack, user, pointed_thing)
      local v = user:get_look_dir()
      local pos = user:getpos()
      pos.y = pos.y + 1.2

      local obj = minetest.add_entity(pos, "grenade:grenade")
      obj:setvelocity({x = v.x * 4, y = v.y * 2 + 4, z = v.z * 4})
      obj:setacceleration({x = v.x / 4, y = v.y / 2 - 4, z = v.z / 4})

      itemstack:take_item()
      return itemstack
   end,
})

minetest.register_entity("grenade:grenade", {
   physical = true,
   collide_with_objects = true,
   weight = 5,
   textures = {"default_coal_lump.png"},
   on_activate = function(self, staticdata)
      self.timer = 0
   end,
   on_step = function(self, dtime)
      local acc = self.object:getacceleration()
      self.object:setacceleration({x = acc.x * 2 / 4, y = acc.y, z = acc.z * 2 / 4})

      self.timer = self.timer + dtime
      if self.timer > 4 then
         tnt.boom(self.object:getpos(), def)
      end
   end,
})


https://github.com/everamzah/grenade

For a heavy object, air resistance won't matter much so you can use a flat acceleration (9.8 m/s^s or whatever) and get a good approximation.

[Hybrid Dog]

l constantly get this error message: WARNING[Server]: Deprecated call to "get_entity_name
l don't know why there's just one quote in the message…
How can l get the entity name without using get_entity_name?