Post your modding questions here

[rubenwardy]

Evaluate means to find or work out the value of something. So evaluating v is finding out the value of v.

[Hybrid Dog]

v is a table which means it's a reference to it l think
and the value of v is this reference, isn't it?
So if v is written, the reference to the table is searched (evaluation), thus v.name(v,args) causes two evaluations, doesn't it?

[kaeza]

v is a table which means it's a reference to it l think
and the value of v is this reference, isn't it?
so if a field of v gets changed somehow, there's no difference if v was evaluated only once or more times, is it?

Consider this 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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a.b.c.d:func()

The alternative is:

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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a.b.c.d.func(a.b.c.d)

Evaluating a.b.c.d only once gives great savings, but is otherwise equivalent.
Now think about things 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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somefile:read():sub(...)

[Hybrid Dog]

thanks

Now think about things 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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somefile:read():sub(...)

This could do the same

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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local txt = somefile.read(somefile)
txt.sub(txt, ...)

[kaeza]

That is the best way IMHO, but my point is that evaluating some expressions may cause side-effects, so it would cause tons of bugs if evaluated more than once.

[Hybrid Dog]

Obviously the sub of another text works on the text

Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio
> print(("unused text").sub("use this",3))
e this

[TortueGaming]

How do I use tnt.boom from the new TNT API that's coming in 0.4.14?

I want to make a chest that has a tiny tiny chance of exploding when items are moved to and from it, I have the latest build of Minetest and Minetest_game from Git, and I have the position part of "tnt.boom(position, definition)" down, but I don't know how to fill in "definition".

[Krock]

but I don't know how to fill in "definition".

https://github.com/minetest/minetest_ga ... i.txt#L220
It is the same definition like you would use to register a TNT node but you won't need to define the keys "name", "description" and "tiles" for your function call.

[BrunoMine]

I use a method for to search the generated mapblock with jungletree

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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-- small algorithm to detect generation jungles.
minetest.register_on_generated(function(minp, maxp, seed)
   
   -- check height
   if maxp.y < 10 or minp.y > 90 then return end
   
   -- center pos
   local cp = vector.add(minp, 40)
   
   -- load map
   minetest.get_voxel_manip():read_from_map(minp, maxp)
   
   -- search jungle tree
   if minetest.find_node_near(cp, 40, {"default:jungletree"}) == nil then return end
   
   -- More code ...
   
end)


This algorithm seems to work fine, but does not seem to be very efficient for computer processing.
Does anyone have an algorithm that performs the same function?

[MineYoshi]

A simple question, how to make when i eat, by example: "test:test_food" give me a text, heal me and be replaced by another item???

[ErrorNull]

Topic: Immediately halting player's movement

I'm making a mod that needs to freeze a player's movement immediately upon a timer hitting zero. However, I've found that if the player happens do be moving at that moment (up/down/left/right movement key pressed down) and when my timer hits zero.. player:set_physics_override({speed=0}) ...does not register until AFTER the player releases the input... resulting in the player sliding/gliding indefinitely until hitting an obstacle or dropping down a node.

If player was not moving at the time my timer hits, player:set_physics_override({speed=0}) functions as expected and player can longer move.

Is there anything I can do to remedy this? Is there a way to block or ignore player input?

[iangp]

Topic: Immediately halting player's movement

I'm making a mod that needs to freeze a player's movement immediately upon a timer hitting zero. However, I've found that if the player happens do be moving at that moment (up/down/left/right movement key pressed down) and when my timer hits zero.. player:set_physics_override({speed=0}) ...does not register until AFTER the player releases the input... resulting in the player sliding/gliding indefinitely until hitting an obstacle or dropping down a node.

If player was not moving at the time my timer hits, player:set_physics_override({speed=0}) functions as expected and player can longer move.

Is there anything I can do to remedy this? Is there a way to block or ignore player input?

Have you tried treat the player as a entity, SAO object ? (I dunno the right terminology)...
player:setacceleration({x=0, y=0, z=0})
player:setvelocity({x=0, y=0, z=0})

[ErrorNull]

Have you tried treat the player as a entity, SAO object ? (I dunno the right terminology)...
player:setacceleration({x=0, y=0, z=0})
player:setvelocity({x=0, y=0, z=0})

Thanks for the pointers iangp. I tried inserting both into my code, but neither made any effect to the outcome. I'm still still fairly new to modding minetest and this is just my first mod. I'll need to into working with SAO entity objects. How would I treat the player as an SAO entity? The lua_api.txt states that those functions are "LuaEntitySAO-only (no-op for other objects)" .. so not sure if I can work with these?

[kaeza]

It's not possible ATM to modify the player velocity, and the physics override as you say suffer from some misfeatures(though they may actually be useful).

I suggest creating a dummy, invisible entity at the player's position, and attaching the player to it. Look for `set_attach` in the Minetest API.

[KCoombes]

A simple question, how to make when i eat, by example: "test:test_food" give me a text, heal me and be replaced by another item???

I think you want on_use

[iangp]

@ErrorNull and @kaeza XD I have a bad memory...
I have missed that: http://dev.minetest.net/ObjectRef
"Note that all ObjectRefs except player are actually LuaEntitySAO."
I just had misremembered ObjectRef as LuaEntitySAO...

-- thats just pseudo-pseudo-code, read the about the right syntax on api_lua.txt
-- As cabeza said try to make a dummy entity:
minetest.register_entity("dummy" ... blablabla.. invisible textures... little size... not pointable...
-- Now you just call it when the timer hit zero, If i'm not wrong... but, whatever, its computationally acceptable to test it...
dummy = minetest.entity_add( on player position, the "dummy" object...
player:set_attach(dummy, "", {0,0,0}, {0,0,0}) --set_attach(parent, bone, position, rotation)`

[xeranas]

How I can reset player skybox to default server? I want temporally change user skybox and then return to 'normal'.

[Foghrye4]

How I can reset player skybox to default server? I want temporally change user skybox and then return to 'normal'.

save player:get_sky() parameters somewhere, then call them back.

My question.
When i call minetest.sound_stop(whatever) in a middle of a sound i heard a nasty clicks. Calling it exactly on an end of a track is not an option, because it is looped. Is this a bug of OS audio driver or game, or Irrlicht engine? Can i workaround this somehow?

[burli]

I have a question about this thread. Why?

From my experience with forums (I'm hosting my own forum since 16 years) threads like this doesn't make sense.

- Any answer is lost in over 100 of pages.
- No one can find an answer with the search function
- No one can link to an answer if someone asks an already answered question
- Discussions from different questions can be mixed and confuse more then they help.

It would make more sense to make a modding question subforum instead of this monster thread.

Just my two cent

[benrob0329]

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.register_node("usable_decor:cabnet", {
   description = "Wood Cabnet",
   drawtype = "mesh",
   mesh = "usable_decor_cabnet.b3d",
   tiles = {"usable_decore_cabnet.png", "usable_decore_cabnet.png"}
})

Any ideas as to why its black when placed, but not when wielded?

[TenPlus1]

benrob: add: paramtype = "light", to the node definition.

[Amaz]

...
Any ideas as to why its black when placed, but not when wielded?

Try adding paramtype = "light", to the node def.

[benrob0329]

That worked, now I just have to figure out how to import a b3d back into Blender because I forgot to save it as a blend too...

[sofar]

That worked, now I just have to figure out how to import a b3d back into Blender because I forgot to save it as a blend too...

If it's not animated, make it an .obj file instead (waveform object). Those can be directly opened by blender.

[Don]

Set paramtype = "light",

[benrob0329]

That worked, now I just have to figure out how to import a b3d back into Blender because I forgot to save it as a blend too...

If it's not animated, make it an .obj file instead (waveform object). Those can be directly opened by blender.

That helped get rid of some weird UV distortion as well, though now I have weird connected vertices...



EDIT: Never mind, figured it out.

[sofar]

That worked, now I just have to figure out how to import a b3d back into Blender because I forgot to save it as a blend too...

If it's not animated, make it an .obj file instead (waveform object). Those can be directly opened by blender.

That helped get rid of some weird UV distortion as well, though now I have weird connected vertices...

EDIT: Never mind, figured it out.

UV unmapping can be challenging :)

[benrob0329]

Everything should be lining up perfectly:



But its not...

[sofar]

Everything should be lining up perfectly:

But its not...

You've got triangular faces with different sizes, they don't UV unmap the way you think they do.

Split the Stone texture stuff into different faces, so that the stone side is a separate face, and the triangle stuff disappears.

[benrob0329]

Not perfect, but MUCH better: