Post your modding questions here

[prestidigitator]

Mgv6 has lots of offsets, noise often generates patterns that align with (x=0, z=0) or points at noise 'spread' distances from there, so offsets help to break up those alignments. When hmmmm took over mapgen 3 years ago he luckily didn't bother with offsets to keep thing simpler, they are a headache for sure.

Oh. I see what you mean. An offset that's not represented in the noise parameters. Yeah, it'd be nice if noise were more...composable, and could be parameterized more generically. Then USERS of the noise wouldn't have to know or care. But that ship sailed a long time ago....

[Kilarin]

I'm trying to figure out how to define biomes.
I can see that I can control what altitudes a biomes can appear at by changing y_min and y_max.
And that I can set heat_point and humidity_point to set the temperature and moisture requirements of my biome.
But how can I control biome frequency?
Meaning: Do I have to define biomes in such a way that only ONE biome type can match any given combination of altitude, temp, and humidity?
OR, is there a way to say "out of these 3 possible biome matches choose with odds biome1=10% biome2=30% biome3=60% ?

sorry for my ignorance, this is my first time playing with biomes.

<EDIT> And one more question, would there be any possible way for me to control biomes based on the X and Z coords as well? Or will I have to build a complete customized biome system to do that?

[Johnny Joy]

In a mod, how it is possible to look up the replacement pairs in a recipe from an item or item name?

[rubenwardy]

Do you want to get a recipe for an output?

lua_api.html: Item Handling

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Code: Select all

local recipe = minetest.get_craft_recipe("mod:output_item")

if recipe.replacements then
    for i=1, #recipe.replacements do
        print(recipe.replacements[i][0] .. " to " .. recipe.replacements[i][1])
    end
end


[Johnny Joy]

I'm just modifying he default furnace code to handle stackable replacements. Since the c++ code will ignore replacements, unless there is only 1 item left in the fuel inventory(like a lava bucket), then any replacements for items greater than 1 would need to be handled in the lua code, for now. I planed to place the replacement for the consumed fuel into one of the 4 dst slots, assuming one was free. This allows for bottles of fuel to be used and for the bottles to be returned rather than lost.

Thanks.

Do you want to get a recipe for an output?

lua_api.html: Item Handling

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 recipe = minetest.get_craft_recipe("mod:output_item")

if recipe.replacements then
    for i=1, #recipe.replacements do
        print(recipe.replacements[i][0] .. " to " .. recipe.replacements[i][1])
    end
end


[paramat]

> Do I have to define biomes in such a way that only ONE biome type can match any given combination of altitude, temp, and humidity?

Yes.

> would there be any possible way for me to control biomes based on the X and Z coords as well?

No, not in the biome API =)

[BrunoMine]

How to prevent a message from appearing in the global chat
Example of my code:

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Code: Select all

minetest.register_on_chat_message(function(name, message)
   if name == "Admin" then
      minetest.chat_send_player(name, "[ADMIN]" .. name .. ": " .. message)
      return false
   end
end)


out:
<BrunoMine> Hi
[ADMIN]BrunoMine: Hi

If possible tell me how to change the text color

[rubenwardy]

You can't stop the "<brunomine>" bit as that is done on the client. Other players don't see that, though.

[BrunoMine]

You can't stop the "<brunomine>" bit as that is done on the client. Other players don't see that, though.

Understood.

[Johnny Joy]

Sorry, no replacements were returned, but they are clearly defined in the recipe. Minetest version 4.1.12

Recipe

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Code: Select all

minetest.register_craft({
        type = "fuel",
        recipe = "farming:bottle_ethanol",
        burntime = 240,
        replacements = {{ "farming:bottle_ethanol", "vessels:glass_bottle"}}
})


Do you want to get a recipe for an output?

lua_api.html: Item Handling

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 recipe = minetest.get_craft_recipe("mod:output_item")

if recipe.replacements then
    for i=1, #recipe.replacements do
        print(recipe.replacements[i][0] .. " to " .. recipe.replacements[i][1])
    end
end


[Kilarin]

would there be any possible way for me to control biomes based on the X and Z coords as well?

No, not in the biome API =)

I don't suppose there is any chance you could be talked into expanding your biome API to include a biome_function(minp,maxp) that is checked each time the map generator thinks a certain biome would fit, and returns true or false, true means generate the biome and false means look for another fit this time???? :)

With that I could control biomes as I need in the fractured game, and anyone who wanted could easily make some biomes more frequent and others rarer.

Otherwise, I'll need to build my own biome generator. There are examples out there at least. :)

Thanks!

[paramat]

The idea is okay but sorry, we can't do this because it's added complexity (slower mapgen) for essentially one use.
Hmmmm and myself decided that biomes should be located using random noise only, without any N-S, E-W, centre-edge etc. variation (the removed indev mapgen had centre-edge variation).
Luckily lua mod biomes (added to mgv5/v7 stone terrain) are now fairly fast using the luavoxelmanip, a variation of paragenv7 might work for you with extra code to locate biomes as you wish, you can use schematics to place trees very fast instead of my lua tree generation code. Remember to clear MTGame biomes and decorations so you have stone terrain only, paragenv7 code does this already.

[Amaz]

I tried/am trying to get biomes in a certain location for lott, which uses a modified paragenv7...
This code would slot in from line 137 of default paragenv7:

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Code: Select all

local nixz = 1
   for z = z0, z1 do
      for x = x0, x1 do -- for each column do
         local n_temp = nvals_temp[nixz] -- select biome
         local n_humid = nvals_humid[nixz]
         local n_ran = nvals_random[nixz]
         local biome = false
         if minp.x > -700 and minp.x < -500
         and minp.z > 500 and minp.z < 700 then
            biome = 13 -- (Shire)
         elseif minp.x > -1000 and minp.x < 1000
         and minp.z > 700 and minp.z < 1000 then
            biome = 1 -- (Angmar)
         elseif minp.x > -500 and minp.x < -50
         and minp.z > 400 and minp.z < 700 then
            biome = 3 -- (Trollshaws)
         elseif minp.x > -50 and minp.x < 150
         and minp.z > -350 and minp.z < 700 then
            biome = 2 -- (Snowplains)
         elseif minp.x > 200 and minp.x < 300
         and minp.z > -200 and minp.z < -100 then
            biome = 7 -- (Lorien)
         elseif minp.x > 150 and minp.x < 300
         and minp.z > -400 and minp.z < -300 then
            biome = 9 -- (Fangorn)
         elseif minp.x > 350 and minp.x < 450
         and minp.z > -200 and minp.z < 650 then
            biome = 10 -- (Mirkwood)
         elseif minp.x > 750 and minp.x < 1000
         and minp.z > 500 and minp.z < 700 then
            biome = 11 -- (Iron Hills)
         elseif minp.x > 750 and minp.x < 1000
         and minp.z > -800 and minp.z < -500 then
            biome = 8 -- (Mordor)
         elseif minp.x > 500 and minp.x < 750
         and minp.z > -700 and minp.z < -450 then
            biome = 6 -- (Ithilien)
         elseif minp.x > 0 and minp.x < 350
         and minp.z > -600 and minp.z < -400 then
            biome = 12 -- (Rohan)
         elseif minp.x > 350 and minp.x < 500
         and minp.z > -1000 and minp.z < -600 then
            biome = 5 -- (Gondor)
   --      else
   --         biome = 4 -- (Dunlands)
         end

It pretty much just replaces the noise with a set of coords. It would be very easy to use math.random and make the biome borders wonder around a bit. The only problem I can see is that the border runs along chunk lines, and so could look rather ugly... I hope it helps.
Paramat may be able to help more... (Which would be good for both of us!!)

[Kilarin]

The idea is okay but sorry, we can't do this because it's added complexity (slower mapgen) for essentially one use

Understood. thanks for considering it!

Luckily lua mod biomes (added to mgv5/v7 stone terrain) are now fairly fast using the luavoxelmanip

Thats what I'm going to have to figure out how to use. thank you!

I tried/am trying to get biomes in a certain location for lott, which uses a modified paragenv7...
This code would slot in from line 137 of default paragenv7:

Thank you so very much! Every example helps!

I'm sure I'll be back with more questions as soon as I get more time to dig into this. :)

[paramat]

It would be very easy to use math.random and make the biome borders wonder around a bit.

Good idea, you can make the biome borders curvy not by using math.random, but by using a noise 'nvals_border' multiplied by a parameter 'border_amp' which is the rough variation of the border in nodes, so try roughly 64 or whatever and adjust it to taste, you end up with rectangular biomes with curvy edges.
Border noise should have 'spread' values roughly of average biome size, persistence of around 0.5, and only need 2 or 3 octaves, so will be fast.
Best to use 2 border noises, one for each of x and z.

[paramat]

So, just rename the temperature and humidity noise code to borderx and borderz.
Then the optimised code will be to check x and z, not checking minp or maxp:

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Code: Select all

    local nixz = 1
       for z = z0, z1 do
          for x = x0, x1 do -- for each column do
             local biome = false
             local noisy_x = x + nvals_borderx[nixz] * border_amp
             local noisy_z = z + nvals_borderz[nixz] * border_amp
             if noisy_x > -700 and noisy_x < -500
             and noisy_z > 500 and noisy_z < 700 then
                biome = 13 -- (Shire)
             elseif noisy_x > -1000 and noisy_x < 1000
             and noisy_z > 700 and noisy_z < 1000 then
                biome = 1 -- (Angmar) ...............

[Dr. Console]

Topic: How do I use a model created in Blender for a craftitem.
Reason: I wan't to lern how to create mods, an because of this I started to make a simple mod ading some food.
And I want to have a can of Juice in the hand and not a thick version of the inventory icon.
until now i have this code:

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Code: Select all

minetest.register_craftitem("juices:can_applejuice", {
   description = "Can of apple juice",
   inventory_image = "can_applejuice_inv.png",
   visual = "mesh",
   mesh = "appleJuiceCan.3ds",
   textures = {"appleJuiceCan_tex.png"},
   on_use = minetest.item_eat(4, "juices:can_empty")
   })

Hope that someone can help me.

NG
Dr. Console

[rubenwardy]

You should make it as a mesh node, with minetest.register_node.

Here is a video I found after a quick google, haven't watched all of it: https://www.youtube.com/watch?v=KfH8-OJ56ok

[Don]

I am trying to place a schematic as a decoration. When it places the schematic does not replace the existing nodes. Just wondering how to make it work?

Also, can someone give me a little guidance with the parameters?
I am using sidelen = 80, and fill_ratio = 0.0002 but it places too many. If I do fill_ratio = 0.0001 then I can not finnd any.
I am just starting to learn about mapgen stuff and not sure how the parameters work.

[paramat]

You need 0.4.12dev and use 'force placement' in flags:

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Code: Select all

flags = "place_center_x, place_center_z, force_placement",

But also make sure all air nodes in your schematic have probability 0 or are changed to "ignore", otherwise the air nodes will replace the terrain.
My biomesdev mod might help as an example.

[Don]

You need 0.4.12dev and use 'force placement' in flags:

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Code: Select all

flags = "place_center_x, place_center_z, force_placement",

But also make sure all air nodes in your schematic have probability 0 or are changed to "ignore", otherwise the air nodes will replace the terrain.
My biomesdev mod might help as an example.

0.0001 may be too small a number to work, try sidelen = 16 and a larger number. 16 will work with any mapchunk size, not just mapchunks of 5x5x5 mapblocks.

I tried sidelen = 16 and around a thousand numbers. Still can not get it to do what I want. I am just not getting it.
I want a schematic to be placed in the desert. Want it to be one schematic per desert. I know it will not be exact. Some deserts may have none and others have 2 or 3. I just can not get it to do that. Either the schematic is everywhere or does not place.
Is there a link to some info about it. I do not understand the different settings so I am just guessing at what to change.
I checked your biomesdev mod. I see what you have done but do not understand why you used those settings. I searched for info on it but came up empty.

[Dr. Console]

Is there a way to let a recipe randomly generate a defined sideproduct while cooking?
E.g. if sand is in the furnance it generates glas and with a 1/5 chance a copper lump.

At the moment my code looks like this and doesn't run:

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Code: Select all

minetest.register_craft({
   type = 'cooking',
   local rand = math.random([1[, 10]])
   if rand > 5 then
         bla bla bla

NG
Dr. Console

[rubenwardy]

Unfortunately not Dr. Console. The craft system isn't that flexible, you'd have to make your own craft system.

That code is invalid, you can't put statements there, only table entries.

[Dr. Console]

Seems like there will be some things which need further tweaking xD
Well, even if is isn't possible, is there a way to adress the other 3 outputslots of the furnace?
Everytime i insert a table of outputs like

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output = {'default:sand', 'own:ash'}

is get an error that there're not enougth output slots

15:14:01: ERROR[main]: ========== ERROR FROM LUA ===========
15:14:01: ERROR[main]: Failed to load and run script from
15:14:01: ERROR[main]: C:\Program Files\minetest-0.4.12\bin\..\mods\more_ores\init.lua:
15:14:01: ERROR[main]: Crafting definition (cooking) is missing an output
15:14:01: ERROR[main]: stack traceback:
15:14:01: ERROR[main]: [C]: in function 'register_craft'
15:14:01: ERROR[main]: ...ram Files\minetest-0.4.12\bin\..\mods\more_ores\init.lua:33: in main chunk
15:14:01: ERROR[main]: ======= END OF ERROR FROM LUA ========

[minetestcr]

Hello!


I'm trying to define spawnpoint for a server with Traxie21's ServerExtended, but had no luck.
the clients spawn at random locations, and when they exit and come back, they spawn at the last point they were.
Anybody has a clue? or another mod?

I'm using minetest 0.4.12-dev with ServerExtended Unstable (https://forum.minetest.net/viewtopic.php?f=11&t=4716)

thanks!

[stu]

Is there a way to let a recipe randomly generate a defined sideproduct while cooking?
E.g. if sand is in the furnance it generates glas and with a 1/5 chance a copper lump.

You could use minetest.register_on_craft to add the sideproducts directly to the player's inventory.

[paramat]

Don

> 0.0001 may be too small a number to work, try sidelen = 16 and a larger number.

Actually i was wrong there, the fill ratio will be the same with any sidelen and will probably not help your problem.
For a low density decoration you are best leaving sidelen unset, sidelen will then be auto-set to the default of mapchunk size (usually 80x80).
One decoration per desert is probably impossible using the bioome API, as it processes a whole chunk at a time, so will either place an average of 1 per chunk or 0 per chunk. You will need a custom lua on-generated function to do what you want and place a schematic, don't know how though for exactly 1 schematic per desert.

[Don]

Don

> 0.0001 may be too small a number to work, try sidelen = 16 and a larger number.

Actually i was wrong there, the fill ratio will be the same with any sidelen and will probably not help your problem.
For a low density decoration you are best leaving sidelen unset, sidelen will then be auto-set to the default of mapchunk size (usually 80x80).
One decoration per desert is probably impossible using the bioome API, as it processes a whole chunk at a time, so will either place an average of 1 per chunk or 0 per chunk. You will need a custom lua on-generated function to do what you want and place a schematic, don't know how though for exactly 1 schematic per desert.

Ok. Thanks. That makes sense. I will read about on_generate and see if I can make that work.

[Don]

Hello!


I'm trying to define spawnpoint for a server with Traxie21's ServerExtended, but had no luck.
the clients spawn at random locations, and when they exit and come back, they spawn at the last point they were.
Anybody has a clue? or another mod?

I'm using minetest 0.4.12-dev with ServerExtended Unstable (https://forum.minetest.net/viewtopic.php?f=11&t=4716)

thanks!

Just add "static_spawnpoint = 0,0,0" to your mintest.conf

[paramat]

Don,
One way could be to calculate mgv6 biome noise per column (see my landup mod to see how, strip out all the noises except 'biome' noise, which is > 0.4 in deserts and locates them), and if it reaches a high value of roughly 1.2-1.5 then place your decoration somewhere in the mapchunk. This won't gaurantee 1 decoration per desert but it will be 0, 1 or 2 per desert if you carefully adjust the noise threshold.