Post your modding questions here

[Casimir]

Then I don't think it is possible, you probably have to use on_use.

Does anybody know why this returns "0" ? I'm calling it five seconds after the game started.
local number = table.maxn(minetest.registered_items)

[Krock]

local number = table.maxn(minetest.registered_items)

And

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local number = #minetest.registered_items

?

[Casimir]

Zero

This works:

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   local number = 0
   for name, item in pairs(minetest.registered_items) do
      number = number + 1
   end


[philipbenr]

Quick Question:
(probably been asked before, but I can't seem to find it)

When crafting an item, how can I get an item as an output and then have another item be put back into my inventory? I wish to craft milk in drinking glasses that uses a bucketful of milk from kpgmobs and vessels. I want the output to be 5 glasses of milk, and I also want to have the bucket be returned to a slot in my inventory. How to do so?

[Krock]

<snip>

Do you mean replacements?

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minetest.register_craft( {
   type = "shapeless",
        output = "homedecor:terracotta_base 8",
        recipe = {
      "default:dirt",
      "default:clay_lump",
      "bucket:bucket_water"
        },
   replacements = { {"bucket:bucket_water", "bucket:bucket_empty"}, },
})

Random from homedecor.
It will return you 8 terracotta base and an empty bucket.

[philipbenr]

I believe so. Thank you, Krock.

[lag01]

Hello,
i want to write lua code to punish players who hit another players at spawn.
How can i detect when that happens?

Or maybe there already is mod for that?

[Sokomine]

When crafting an item, how can I get an item as an output and then have another item be put back into my inventory? I wish to craft milk in drinking glasses that uses a bucketful of milk from kpgmobs and vessels.

There's a receipe (afaik in the food mod?) that uses two buckets of milk for one cheese - without returning any buckets. I'm not sure if two items may be returned simultaneously. Perhaps in such cases a special "machine" might be best. I didn't get around to give the barrels from my cottages mod any functionality yet.

[Topywo]

When crafting an item, how can I get an item as an output and then have another item be put back into my inventory? I wish to craft milk in drinking glasses that uses a bucketful of milk from kpgmobs and vessels.

There's a receipe (afaik in the food mod?) that uses two buckets of milk for one cheese - without returning any buckets. I'm not sure if two items may be returned simultaneously. Perhaps in such cases a special "machine" might be best. I didn't get around to give the barrels from my cottages mod any functionality yet.

replacements = { { "bucket:bucket_water", "bucket:bucket_empty"}, { "charcoal:charcoal", "default:torch 4"}}


This seems to work, giving you the standard output, an empty bucket and 4 torches (tested with charcoal mod). I thought I tried something similar a year ago without any luck, so maybe it's a new feature, idk.


Edit: The replacements are placed in the crafting grid. This means that as long as you can craft, the replacements are not placed in the crafting grid, because the crafting materials are in there. So not very suitable for 'mass' crafting production. It would have been nicer if the replacements would be placed directly in your inventory.

[leeminer]

I'm getting the hang of modding minetest now. I'm curious about the limits of the modding api. Can someone give me a rough idea of what is possible with the minetest api? What can and cannot be done.

[lag01]

I'm getting the hang of modding minetest now. I'm curious about the limits of the modding api. Can someone give me a rough idea of what is possible with the minetest api? What can and cannot be done.

For now, i noticed two wierd limitations:
you can use your function on chat message event, but cannot change or cancel message itself.
no api to call your code, when player is hit or killed by other player. workaround i used in my mod, was to use minetest.register_on_dieplayer + minetest.get_objects_inside_radius

You probably already had seen http://dev.minetest.net/Category:Methods, http://dev.minetest.net/Player etc. Also more insane way: http://dev.minetest.net/Global_tables

[leeminer]

Been banging my head for some time so here goes.

How can you access the player object in singleplayer and modify it? I am trying to modify the player object to decrease gravity or increase jump height but I get an error when I insert my code.

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player:set_physics_override({gravity=3.0})

I also tried

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user:set_physics_override({gravity=3.0})

I found info here, http://dev.minetest.net/Player, however once again I think I am missing something horribly simple and obvious. Any help would be appreciated. I want my character to jump a round like superman ;)

[lag01]

Been banging my head for some time so here goes.

How can you access the player object in singleplayer and modify it? I am trying to modify the player object to decrease gravity or increase jump height but I get an error when I insert my 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

player:set_physics_override({gravity=3.0})

I also tried

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

user:set_physics_override({gravity=3.0})

I found info here, http://dev.minetest.net/Player, however once again I think I am missing something horribly simple and obvious. Any help would be appreciated. I want my character to jump a round like superman ;)

If you want do this to all players in game, i believe you can do this just by minetest.conf

Else, you must call your code somewhere, where "player" is set, for example inside http://dev.minetest.net/minetest.register_on_joinplayer

[leeminer]

Getting closer to changing the speed, gravity and jump of the player. Sooo close...
Can someone tell me why this code doesn't work? It throws a lua init error when launching the world with my mod enabled.

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local player = minetest.get_player_by_name("singleplayer")
player:set_physics_override({gravity=3.0,jump=3.0,speed=3.0})

I also tried the example at this page with no luck...

http://dev.minetest.net/minetest.get_player_by_name

So close I can taste it!

[lag01]

Getting closer to changing the speed, gravity and jump of the player. Sooo close...
Can someone tell me why this code doesn't work? It throws a lua init error when launching the world with my mod enabled.

may-be you are calling your code at wrong place or in wrong time. for example right in mod body, while player "singleplayer" not exists yet.
try something like this:

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minetest.register_on_joinplayer(function(player)
   player:set_physics_override({gravity=3.0,jump=3.0,speed=3.0})
end)


[4aiman]

You can use minetest.get_connected_players() also

[leeminer]

Getting a player object has failed me so far. Even with suggestions. I resorted to modifying the main config file and adjusting gravity jump etc there.

However I was wondering if there is a way to debug a script. Does anyone know how? I need more useful errors than the standard can't load the lua file.

[paramat]

leeminer, see https://forum.minetest.net/viewtopic.php?f=11&t=7224 for manual change of physics by chat command, or https://forum.minetest.net/viewtopic.php?f=11&t=6329 for automatic change of physics depending on location.

[prestidigitator]

Getting a player object has failed me so far. Even with suggestions. I resorted to modifying the main config file and adjusting gravity jump etc there.

However I was wondering if there is a way to debug a script. Does anyone know how? I need more useful errors than the standard can't load the lua file.

There is no built-in debugging mechanism. You can use the print() function to send information to Minetest's standard output (or error—not sure which), which is generally visible when you start Minetest from a command line. The minetest.debug() and minetest.log() functions do similar things. I also created a LuaCmd mod which allows you to run snippets of Lua code from Minetest's chat console and is intended to help with some debugging tasks (such as calling global functions and examining global variables). If you use that mod, give this command a try:

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/lua me:set_physics_override({ gravity=3, jump=3, speed=3 })


That works because the LuaCmd mod does the player lookup for you and provides the special variable "me" that refers to the player object of the player currently issuing the command.

EDIT: Oh, by the way, setting both gravity and jump to 3 might be a bit cross-purpose, as one allows you a stronger initial jump, while the other causes gravity to pull stronger. You might try one or the other, or setting gravity to a fractional value (e.g. 0.333). By increasing both you may have little or no impact on the player's jump height, though falling off a cliff could be different.

[davidthecreator]

hi im new at this but im kinda trying to make mods and finaly im succeeded so i would like to know how to make them downloadable to others

[Chinchow]

I am very new to entities, and I would like to know this: How are setacceleration, setvelocity, etc used? I've tried to call them, but I can't figure out how.

[Topywo]

hi im new at this but im kinda trying to make mods and finaly im succeeded so i would like to know how to make them downloadable to others

You could search for an upload site that let's you upload mods and screenshots. Look at the links in mod releases to get an overview of the most common.

I use dropbox, it suites me best at this moment. GitHub is also a possibility, but that may take more time to get accustomed to. Or Bitbucket.

[LionsDen]

davidthecreator you can always use the forum attachment function if you mod isn't huge. If you look below where you type a reply or a topic, there is an options tab and an upload attachment tab. Just click the upload attachment tab and then browse to the file you want to upload. Once selected, just click the add the file button and your file will be uploaded to the forum, you can even give it a comment if you want to.

[fireuser]

I love with the idea of mobs, so I am trying to make some. I made models in blender, but I don't know how to use them in to the mod. I think you should use .x files ,but blender would not let me export the models as .x files.

[Evergreen]

I love with the idea of mobs, so I am trying to make some. I made models in blender, but I don't know how to use them in to the mod. I think you should use .x files ,but blender would not let me export the models as .x files.

Export them as .b3d instead. I made a tutorial here: viewtopic.php?p=151207#p151207

[drkwv]

I tried to create a first-person-shooter weapon mod https://github.com/yetanotherusernamebe ... omsdayarms using a code of cannons mod, but ran into an issue with the entities: I can shoot through walls when facing it close enough. The reason for this is the initial velocity: bullet spawns inside of a wall, gets velocity and thus not collide with it. When I set velocity to 0, bullet collides successfully. Is there an easy way to workaround this problem? Or maybe I should not use entities for bullets at all?

[Evergreen]

I tried to create a first-person-shooter weapon mod https://github.com/yetanotherusernamebe ... omsdayarms using a code of cannons mod, but ran into an issue with the entities: I can shoot through walls when facing it close enough. The reason for this is the initial velocity: bullet spawns inside of a wall, gets velocity and thus not collide with it. When I set velocity to 0, bullet collides successfully. Is there an easy way to workaround this problem? Or maybe I should not use entities for bullets at all?

If you want the bullets to be visual, nothing else would really work (even entities are a bit iffy for something moving that fast). Most gun mods I have seen don't use visuals for the bullet, and just use math for figuring that out.

[drkwv]

Most gun mods I have seen don't use visuals for the bullet, and just use math for figuring that out.

Honestly, I'd like to have some visuals. Like the old Ace of Spades had.

[stu]

Quick one, is it safe to use alpha channel for HUD images?
(by that I am referring to partial transparency)

[HeroOfTheWinds]

Quick one, is it safe to use alpha channel for HUD images?
(by that I am referring to partial transparency)

Yup! :) Just take a look at Big Freaking Dig, the tool hotbar uses a semi-transparent overlay for the selected tool, if I remember correctly.