Post your modding questions here

[stu]

I can happily transfer items to and from the chest , even though I expect the return 0 to cause a denial. The chats aren't printed when de-commented either.

If you make changes to a node's formspec after placement then those changes will not take effect until you re-place the node causing on_construct to be re-called. Could that be the problem?

[taikedz]

stu - whilst that was a relevant remakr, it did not resolve the prolem

orwell, I adjusted your code to match what I have, and after digging/replacing the blocks I have.... no chest inventory. Blank space above my player inventory...

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Code: Select all

minetest.register_node("interchest:wormhole_chest", {
        description = "Wormhole Chest",                 
        paramtype2 = "facedir",
        groups = {oddly_breakable_by_hand=2,choppy=3},
        after_place_node = function(pos,player,itemstack,pointedthing)
                local meta = minetest.get_meta(pos)
                local pname = player:get_player_name()
                meta:set_string("formspec",
                                "size[8,9]"..
                                "list[detached;interchest_"..pname..";0,0;8,4;]"..
                                "list[current_player;main;0,5;8,4;]" ..
                                "listring[detached;interchest_"..pname.."]" ..
                                "listring[current_player;main]")
                meta:set_string("infotext", "Wormhole Chest")
        end,
})

minetest.register_on_joinplayer(function(player)
        local pname = player:get_player_name()
        minetest.create_detached_inventory("interchest_"..pname, {
                allow_put=function (inv, listname, index, stack, player) return 0 end,
                allow_take=function (inv, listname, index, stack, player) return 0 end,
        })
end)



[hajo]

Some mods have a file mod.conf, but I found no documentation about that file and its usage.

Can someone explain, or give a pointer to more info ?

[kaeza]

Some mods have a file mod.conf, but I found no documentation about that file and its usage.

Can someone explain, or give a pointer to more info ?

It's a text file containing mod metadata.

At the moment, only the `name` field is used. The engine uses this as the mod's "internal" name. If this is not present, the engine uses the directory name.

Simply create such a file with:

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Code: Select all

name = my_mod_name


See also: This topic, original proposal, issue #2201.

[amadin]

deleted. understood by himself

[orwell]

stu - whilst that was a relevant remakr, it did not resolve the prolem

orwell, I adjusted your code to match what I have, and after digging/replacing the blocks I have.... no chest inventory. Blank space above my player inventory...

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_node("interchest:wormhole_chest", {
        description = "Wormhole Chest",                 
        paramtype2 = "facedir",
        groups = {oddly_breakable_by_hand=2,choppy=3},
        after_place_node = function(pos,player,itemstack,pointedthing)
                local meta = minetest.get_meta(pos)
                local pname = player:get_player_name()
                meta:set_string("formspec",
                                "size[8,9]"..
                                "list[detached;interchest_"..pname..";0,0;8,4;]"..
                                "list[current_player;main;0,5;8,4;]" ..
                                "listring[detached;interchest_"..pname.."]" ..
                                "listring[current_player;main]")
                meta:set_string("infotext", "Wormhole Chest")
        end,
})

minetest.register_on_joinplayer(function(player)
        local pname = player:get_player_name()
        minetest.create_detached_inventory("interchest_"..pname, {
                allow_put=function (inv, listname, index, stack, player) return 0 end,
                allow_take=function (inv, listname, index, stack, player) return 0 end,
        })
end)



Please look anywhere how detached inventories work. It seems like the detached inventory has size 0. You need to set it somehow. I don't even know if my definition is right. This was just the approach, no working code.

[taikedz]

Please look anywhere how detached inventories work. It seems like the detached inventory has size 0. You need to set it somehow. I don't even know if my definition is right. This was just the approach, no working code.

Yes I've been reading up too, no hint so far as to what is going wrong. I'll keep hunting then. THanks again!

[Me Me and Me]

I need the item-string of air to make an "abm" for a mod. Is it one of these?:
"default:air"?
"air:air"?
"air"?

[taikedz]

Air is simply "air"

You might also find this quickly useful http://wiki.minetest.net/Itemstrings

[nomohakon]

Is there a mod that has mobs that take items from marked chest and deliver them to diferently marked chest? Or mobs that follow player and collect dropped items and deliver them to marked chest? Is it even possible?

[azekill_DIABLO]

yeah, the "living hand" from living tools go and takes back items.

[orwell]

@core devs:
What is better for performance/memory?
- 1 detached inventory that contains 200 lists, or
- 100 detached inventories that each contain 2 lists, or
- 200 detached inventories that each contain 1 list
I would prefer the first one, but don't know how lists are handled.

[rubenwardy]

Lists are stored in an array by their inventory. This means that a linear search needs to be done each time you do something to a list, so O(n). Detached inventories are stored in a hash map, so finding an inventory uses a hash lookup - the performance of this is variable (it depends on how good the hash algorithm is, and how well the items are partitioned) but generally a good one doesn't take more than 7 look ups [citation needed]

So #3 may be faster than #1 due to a lookup rather than a linear search, however I'd go with #1 over #3 as it's nicer conceptually, and the slow down probably isn't noticible, and also uses less objects. This needs testing though, all this is from me reading the code. There may be non-obvious factors, I didn't look into how it's transferred to Lua.
Feel free to correct me - this is not an area I've worked with yet.

A question though is why you need 200 inventory lists. That's crazy.

[orwell]

Worst-case scenario: 200 box wagons in one map.

[cx384]

How can I check where are mapblock and mapchunk borders?
Every 16 nodes and 5 mapblock, but where is the first mapblock?
From x=0 y=0 z=0 to x=15 y=15 z=15?

[Chiu ChunLing]

Somewhat related question, how do I get mapchunks that are already generated? Or is there a better way to use voxelmanip on existing map chunks that have already been generated (for the purpose of updating an existing world to a mod I created)?

[DS-minetest]

let me show you this:

made with gimp

Edit: where "Chunkboarder" is written is the mapblockboarder

[orwell]

I could swear it was documented somewhere...

[cx384]

How to set a group for an item that was already registered?

[Chiu ChunLing]

Oh, I know this one. http://dev.minetest.net/minetest.override_item

Still looking for any info on how to get mapchunks that are already generated to run a voxelmanip on them.

[orwell]

How to set a group for an item that was already registered?

This should also work, since you probably don't want to override the whole 'groups' table:

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Code: Select all

minetest.registered_nodes["mod:node"].groups.yourgroupname=value


afaik, override_item internally does the same

[Chiu ChunLing]

That should work, but I had trouble with it.

[Byakuren]

How to set a group for an item that was already registered?

This should also work, since you probably don't want to override the whole 'groups' table:

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Code: Select all

minetest.registered_nodes["mod:node"].groups.yourgroupname=value


afaik, override_item internally does the same

What happens if the item definition has no groups table? Does register_item create a default one?

[kaeza]

What happens if the item definition has no groups table? Does register_item create a default one?

Thanks to metatables, it inherits from a "base" definition.

Note that since Lua tables are references (i.e. they are not copied), orwell's code may cause unintended effects if the node does not define groups itself (it's unlikely, but possible nonetheless), as you would be modifying the default definition groups in-place.

The correct approach is to create a copy of the `groups` table, modify the copy, then assign it to the node:

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Code: Select all

local def = minetest.registered_nodes["some:name"]
local groups = table.copy(def.groups)
groups.my_group = 123
minetest.override_item("some:name", { groups=groups })


The same should be made for anything that is a table.

[Chiu ChunLing]

Ah, that's a good point.

[Chiu ChunLing]

How can I check where are mapblock and mapchunk borders?
Every 16 nodes and 5 mapblock, but where is the first mapblock?
From x=0 y=0 z=0 to x=15 y=15 z=15?

In trying to resolve my own issue I've gotten a more precise answer to your question, I think. If you take a position and put it through the following formula you get the minp and maxp of the generated mapchunk containing that position.

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pos = {x=1,y=1,z=1}--or whatever position you put in
pos.x,pos.y,pos.z = 80*math.floor((p.x+32)/80)-32,80*math.floor((p.y+32)/80)-32,80*math.floor((p.z+32)/80)-32
minp = pos --this works out to {x=-32,y=-32,z=-32} for the given position pos
maxp = {y=p.y+79,x=p.x+79,z=p.z+79}--this works out to {x=47,y=47,z=47}

This implies that the center mapblock of nodes starts at {x=0,y=0,z=0} and goes to {x=15,y=15,z=15}. I inferred this by adding

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minetest.chat_send_all(minetest.serialize(minp))
minetest.chat_send_all(minetest.serialize(maxp))

to my on_generated function to get feedback on where and when that was being called.

Hopefully I'll be able to use that to make a chatcommand that invokes my on_generated function on existing mapchunks I want to convert.

[cx384]

Thank you all.

[GreenDimond]

How do I apply textures to an OBJ model?

[DS-minetest]

How do I apply textures to an OBJ model?

with an uv map in the model?!

[GreenDimond]

How do I apply textures to an OBJ model?

with an uv map in the model?!

Ehm....wha?