LUA code questions

[Comp52]

This thread is for asking anything you need to ask about writing the code for a mod in Lua. Feel free to post your questions and answer other people's questions.

Here are my questions:

1:what is "full_punch_interval" and what does it do?
2:what is "max_drop_level" and what does it do?
3:what do "uses" and "max level" do?
4:there is no question number four, but everyone asks 3 questions so I wanted a fourth. :)

[PilzAdam]

1:what is "full_punch_interval" and what does it do?

When you hit a object the item has a "cooldown" time. After 1/2 of the "cooldown" it do 1/2 damage (1/3 time = 1/3 damage...). full_punch_interval is the "cooldown" or "reload" time. After this time the tool does max damage.

2:what is "max_drop_level" and what does it do?

It has no effect in the engine but other mods can use it to check what the digged node should drop.

3:what do "uses" and "max level" do?

Uses is the number of nodes the tool can dig in this group.
Every node can define a level in the groups field. If the level is equal to max_level in tooldef then the digging times and uses are equal to the params in the groupcaps field.
If the level of the node is above max_level the tool cant dig the node.
If the level is below max_level the tool is faster and has more uses.
Read this for more information about that: https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt#L549

4:there is no question number four, but everyone asks 3 questions so I wanted a fourth. :)

42

[Comp52]

That definitely helps a lot; thanks, PilzAdam!

Another question; is there a way to find out the level of a node(like the level of dirt, tree, stone, etc)? is there a list of that somewhere?

[PilzAdam]

That definitely helps a lot; thanks, PilzAdam!

Another question; is there a way to find out the level of a node(like the level of dirt, tree, stone, etc)? is there a list of that somewhere?

You can get the definition table of a node via minetest.registered_nodes[nodename].
Example:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

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minetest.registered_nodes["default:dirt"].groups.level

Better way to get 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.get_item_group("default:dirt", "level")

[Comp52]

um, that's not really what I meant. What I meant was, is there some sort of "cheat sheet" that lists all the info on the different nodes?

[cornernote]

Comp52, the Minetest guide (aka GameWiki) does that:
http://guide.minetest.net/minetest/items.php

[Comp52]

thanks, this helps some. Unfortunately, it doesn't list all the info(e.g. doesn't list whether most of the items are cracky, crumbly or snappy, which is what I'm looking for). Thanks for the help, tho.

[PilzAdam]

You can look into the code of the default mod: https://github.com/celeron55/minetest_game/blob/master/mods/default/init.lua

[wcwyes]

how do i get a tool to place a node then disappear?

[wcwyes]

I'm thinking something along the lines of

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_use = minetest.env:set_node(special:myblock})
            end
self.object:remove()
                        end

[Mossmanikin]

how do i get a tool to place a node then disappear?

I'd do it 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.

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on_place = function(itemstack, placer, pointed_thing)
    local pt = pointed_thing
    minetest.set_node({x=pt.under.x, y=pt.under.y+1, z=pt.under.z}, {name="special:myblock"})
    itemstack:take_item()
    return itemstack
end,


[Chinchow]

42

That's no answer!
But then again he didn't know what his question was.

[philipbenr]

4:there is no question number four, but everyone asks 3 questions so I wanted a fourth. :)

42

hahahahahahaha lol :) love it and the book it came from.

[wcwyes]

how do i get a tool to place a node then disappear?

I'd do it 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

on_place = function(itemstack, placer, pointed_thing)
    local pt = pointed_thing
    minetest.set_node({x=pt.under.x, y=pt.under.y+1, z=pt.under.z}, {name="special:myblock"})
    itemstack:take_item()
    return itemstack
end,


thanks

[wcwyes]

is there a way I can hide my node from the recipe guide in unified inventory?

[jojoa1997]

How would I make one item be replace with another item via commands.

[LionsDen]

is there a way I can hide my node from the recipe guide in unified inventory?

Yes, just add not_in_creative_inventory=1 to the groups part of your node definition.

[wcwyes]

is there a way to convey(or apply) my nodes facedir function to the tool?

[LionsDen]

When the tool is used, I think that below will work. If not exactly then something close. I haven't tested this code but I did adapt it from some code that I wrote that did something a little different. Because I haven't tested it, you might want to.
This goes into the node definition code.

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_use = function(itemstack, user, pointed_thing)
          --   pointed_thing.under is the object itself, can be nil.
          --   pointed_thing.above is the object above the pointed thing, can be nil.
          --   pointed_thing.type is nil if nothing is there, node if it is a node and
          --        object if it is an object.
          if pointed_thing.under then
               local dir = pointed_thing.under.param2
               --   Whatever you want to happen here.
          end
     end,


[wcwyes]

not exactly sure of the argument that facedir is doing in paramtype2 to be able to fill in the blanks
sorry I'm kind of new at lua

When the tool is used, I think that below will work. If not exactly then something close. I haven't tested this code but I did adapt it from some code that I wrote that did something a little different. Because I haven't tested it, you might want to.
This goes into the node definition code.

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_use = function(itemstack, user, pointed_thing)
          --   pointed_thing.under is the object itself, can be nil.
          --   pointed_thing.above is the object above the pointed thing, can be nil.
          --   pointed_thing.type is nil if nothing is there, node if it is a node and
          --        object if it is an object.
          if pointed_thing.under then
               local dir = pointed_thing.under.param2
               --   Whatever you want to happen here.
          end
     end,


[LionsDen]

not exactly sure of the argument that facedir is doing in paramtype2 to be able to fill in the blanks
sorry I'm kind of new at lua

The param2 is the node's facedir. So whatever you want to do with it is what you must do. Since I have no idea what you meant by applying it to the tool I can't really help any further than that.

[wcwyes]

in my earlier posts I've been working on a tool/node an object that is is a tool and a node at the same time. I place the tool it turns into a node. I mine the node and it drops the tool. I tried applying param2=facedir to the tool so when I use onplace it faces me but that didn't work.

not exactly sure of the argument that facedir is doing in paramtype2 to be able to fill in the blanks
sorry I'm kind of new at lua

The param2 is the node's facedir. So whatever you want to do with it is what you must do. Since I have no idea what you meant by applying it to the tool I can't really help any further than that.

[LionsDen]

Did you make sure that you used a node type that uses the param2 as a facedir? If you look at the docs, it shouldn't be too hard to figure out what ones you can use.

[wcwyes]

Yes my node does use facedir and it works on the node, I just need it to work when the tool places the node
I'm sure I could figure it out if I looked at the screwdriver mod but when I downloaded it and installed it I got an eof error.
I would rather be looking at working files.
....docs???

Did you make sure that you used a node type that uses the param2 as a facedir? If you look at the docs, it shouldn't be too hard to figure out what ones you can use.

[LionsDen]

Yes my node does use facedir and it works on the node, I just need it to work when the tool places the node
I'm sure I could figure it out if I looked at the screwdriver mod but when I downloaded it and installed it I got an eof error.
I would rather be looking at working files.
....docs???

Here are a few webpages that can help you with modding minetest.


https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt

http://dev.minetest.net/Main_Page

http://sfan5.duckdns.org/minetest-modding-tutorial/html/englishEN.html


There are many more from not very useful to little tidbits of information.

Also, the screwdriver is now a part of the minetest_game. Just go into the games directory and then the minetest_games directory then the mods directory and finally the screwdriver directory. There is the init.lua for the screwdriver. Technic has a screwdriver as well but it is a sonic screwdriver. Hope these help you out with your modding.

[PilzAdam]

https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt

This link is outdated, use https://github.com/minetest/minetest/blob/master/doc/lua_api.txt.

[wcwyes]

https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt

This link is outdated, use https://github.com/minetest/minetest/blob/master/doc/lua_api.txt.

this was quite useful in where I'm trying to go with this mod but doesn't seem to help with the specific question I asked.

[LionsDen]

this was quite useful in where I'm trying to go with this mod but doesn't seem to help with the specific question I asked.

Did you see where I mentioned that the screwdriver mod was a part of the minetest_game now. And also the part where I mentioned that Technic has a Sonic Screwdriver in it. Since I don't know where you want to go with this mod that is all the help I can give because you mentioned that you wanted to look at the code for the screwdriver.

[wcwyes]

this was quite useful in where I'm trying to go with this mod but doesn't seem to help with the specific question I asked.

Did you see where I mentioned that the screwdriver mod was a part of the minetest_game now. And also the part where I mentioned that Technic has a Sonic Screwdriver in it. Since I don't know where you want to go with this mod that is all the help I can give because you mentioned that you wanted to look at the code for the screwdriver.

I've been looking at the screwdriver for it's rotating function ability I want to emulate it with different functions. It's a little harder than expected but I'm slowly progressing.

[LionsDen]

this was quite useful in where I'm trying to go with this mod but doesn't seem to help with the specific question I asked.

Did you see where I mentioned that the screwdriver mod was a part of the minetest_game now. And also the part where I mentioned that Technic has a Sonic Screwdriver in it. Since I don't know where you want to go with this mod that is all the help I can give because you mentioned that you wanted to look at the code for the screwdriver.

I've been looking at the screwdriver for it's rotating function ability I want to emulate it with different functions. It's a little harder than expected but I'm slowly progressing.

Well good luck to you. The indev version can use the old way of facedir but has a newer way as well. If you add ,true after the argument in facedir it will return the new style values. You should be able to find mention of this elsewhere using google.