Post your modding questions here

[jojoa1997]

Most elementary way I can think of: ...

lol you lost me even more

[Chinchow]

Is it possible to restrict an object so it can only be crafted by a certain surface for example

{}{}{} {}

thats the area but as you can see you could craft with the normal craft is there a way to stop that?

[Esteban]

Before you contributed 3d models to Simple Mobs, it made use of 2D Mobs. The repo's here. Take a look at the earlier revisions with the 2D mobs; I don't think there are too many limitations.

EDIT:
You might also want to look at how the torch animation is done. If you can unite the two techniques, the world'll be a better place.

Thanks for the repo, but is there some guide or advanced information about mobs? I would like to understand rather than copying code.

[hoodedice]

Any way of getting the HUD covered by a huge semi-transparent image? If yes, how do I go about achieving it?

[Casimir]

Here an example Kochcurve.

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Code: Select all

tree={
    axiom="A-T-TA-T-TA",
    rules_a="A+TA-T-TA+TA",
    trunk="default:tree",
    leaves="default:leaves",
    angle=60,
    iterations=2,
    random_level=0,
    trunk_type="single",
    thin_branches=true,
    fruit_chance=10,
    fruit="default:apple"
    }

minetest.register_craftitem("tree:spawner", {
    description = "Treespawner",
    inventory_image = "default_stick.png",
    on_use = function(itemstack, user, pointed_thing)
        local pos = pointed_thing.under
        minetest.spawn_tree(pos,tree)
        print("[tree] New tree at "..pos.x..", "..pos.y..", "..pos.z.."")
    end
})


Normally you would write the axiom as "F--F--F" and the rule as "F+F--F+F" but we have to use ABCD for the rules and write "-T" instead of "-". Because the -+*/^& don't include the step forward here. For the step forward you have the options GFfTR as written in the API.

[jin_xi]

i made "proper" lsystems in lua



its penrose tiling , sierpinski triangle and hilbert curve, code below

[spoiler]

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Code: Select all

hilbert = {
   angle = 90,
   iterations = 6,
   axiom = "X",
   constants = "XY",
   rules = {
      X="-YFF+XFFX+FFY-",
      Y="+XFF-YFFY-FFX+"
   },
   materials = { "wool:cyan" }
}

sierp = {
   angle = 120,
   iterations = 6,
   axiom = "f-g-g",
   rules = {
      f = "f-g+f+g-f",
      g = "gg"
   },
   materials = {"wool:red"}
}

penrose = {
   angle = 36,
   iterations = 5,
   constants="6789",
   axiom="[7]++[7]++[7]++[7]++[7]",
   rules={
      ["6"]="81++91----71[-81----61]++",
      ["7"]="+81--91[---61--71]+",
      ["8"]="-61++71[+++81++91]-",
      ["9"]="--81++++61[+91++++71]--71",
      ["1"]="",
   },
   scale=12,
   materials = {"wool:yellow"}
}

lsystem = {}
local matrix = {}

local x = { x=1, y=0, z=0 }
local y = { x=0, y=1, z=0 }
local z = { x=0, y=0, z=1 }

local round = function(n)
   return math.floor(n+0.5)
end

function lsystem.lproc(def)
   local axiom = def.axiom--""
   local tmp = ""

   for i=1, def.iterations do
      if i==1 then
     axiom = def.axiom
      else
     axiom = tmp
      end
      tmp = ""
      for c in axiom:gmatch(".") do
     local rule = def.rules[c] or c
     tmp = tmp..rule
      end
   end
   return tmp
end

lsystem.spawn = function (pos, def)   
   local min = { x = pos.x, y = pos.y, z = pos.z }
   local max = { x = pos.x, y = pos.y, z = pos.z }
   
   local nodes = {}
   local materials = {}
   for _, mat in pairs(def.materials) do
      table.insert( materials, minetest.get_content_id(mat) )
   end
   
   local tmp = matrix.new()
   local rot = matrix.orient(tmp, math.pi/2, z )
   local pos = vector.new(pos)
   local mat = 1
   local stk = {}
   
   local axiom = lsystem.lproc(def)
   print(axiom)
   local axpos = 1
   for c in axiom:gmatch"." do
      if c == "[" then
     table.insert(stk, { rot=rot, pos=pos } )
      elseif c == "]" then
     local s = table.remove(stk)
     rot = s.rot
     pos = s.pos
      elseif c == "+" then
     tmp = matrix.id()
     tmp = matrix.orient(tmp, def.angle*math.pi/180, y)
     rot = matrix.mul(tmp, rot)
      elseif c == "-" then
     tmp = matrix.id()
     tmp = matrix.orient(tmp, -def.angle*math.pi/180, y)
     rot = matrix.mul(tmp, rot)
      elseif c == "&" then
     tmp = matrix.id()
     tmp = matrix.orient(tmp, def.angle*math.pi/180, z)
     rot = matrix.mul(tmp, rot)
      elseif c == "^" then
     tmp = matrix.id()
     tmp = matrix.orient(tmp, -def.angle*math.pi/180, z)
     rot = matrix.mul(tmp, rot)
      elseif c == "/" then
     tmp = matrix.id()
     tmp = matrix.orient(tmp, def.angle*math.pi/180, x)
     rot = matrix.mul(tmp, rot)
      elseif c == "*" then
     tmp = matrix.id()
     tmp = matrix.orient(tmp, -def.angle*math.pi/180, x)
     rot = matrix.mul(tmp, rot)
      elseif c == "C" then
     mat = tonumber(axiom:sub(axpos+1, axpos+1))
      elseif not string.match(def.constants or "", c) then
     for i=1, def.scale or 1 do
     if pos.x < min.x then min.x = pos.x end
     if pos.y < min.y then min.y = pos.y end
     if pos.z < min.z then min.z = pos.z end
     if pos.x > max.x then max.x = pos.x end
     if pos.y > max.y then max.y = pos.y end
     if pos.z > max.z then max.z = pos.z end
     local rpos = { x=round(pos.x), y=round(pos.y), z=round(pos.z)}
     table.insert(nodes, { pos=rpos, mat=materials[mat] } )
     pos = pos + matrix.transpose(rot, x)
     end
      end
      axpos = axpos+1
   end
   
   local vm = VoxelManip()
   min, max = vm:read_from_map(min, max)
   local area = VoxelArea:new{ MinEdge = min, MaxEdge = max }
   local data = vm:get_data()

   for _, node in pairs(nodes) do
      local index = area:indexp(node.pos)
      data[index] = node.mat
   end
   
   vm:set_data(data)
   vm:write_to_map()
   vm:update_map()
   print(string.format("placed %i nodes", #nodes))
end

minetest.register_tool("lsystem:ltool", {
   description = "lsystem spawner",
   inventory_image = "default_stick.png",
   on_use = function(itemstack, user, pointed_thing)
      local t1 = os.clock()
      local pos = pointed_thing.above
      if not pos then return end
      lsystem.spawn(pos, penrose)
      local time = (os.clock() - t1) * 1000
      print(string.format("elapsed time: %.2fms", time))
   end
})

matrix.new = function()
   local m = {}
   for i = 1,4 do m[i] = {}
   for j = 1,4 do m[i][j] = 0
   end
   end
   return m
end

matrix.id = function()
   local m = {}
   for i = 1, 4 do m[i] = {}
   for j = 1, 4 do
      if i == j then
     m[i][j] = 1
      else
     m[i][j] = 0
      end
   end
   end
   return m
end

matrix.mul = function(m1, m2)
   local m = {}
   for i = 1, 4 do m[i] = {}
   for j = 1, 4 do
      local num = 0
      for n = 1, 4 do
     num = num + m1[i][n] * m2[n][j]
      end
      m[i][j] = num
   end
   end
   return m
end

matrix.orient = function(m, angle, axis)
   local c = math.cos(angle)
   local s = math.sin(angle)
   local t = 1.0 - c
   
   local tx  = t * axis.x
   local ty  = t * axis.y
   local tz  = t * axis.z
   local sx  = s * axis.x
   local sy  = s * axis.y
   local sz  = s * axis.z
   
   m[1][1] = tx * axis.x + c
   m[1][2] = tx * axis.y + sz
   m[1][3] = tx * axis.z - sy
   
   m[2][1] = ty * axis.x - sz
   m[2][2] = ty * axis.y + c
   m[2][3] = ty * axis.z + sx
   
   m[3][1] = tz * axis.x + sy
   m[3][2] = tz * axis.y - sx
   m[3][3] = tz * axis.z + c
   return m
end

matrix.transpose = function (m, v)
   local x = m[1][1] * v.x + m[2][1] * v.y + m[3][1] * v.z + m[4][1]
   local y = m[1][2] * v.x + m[2][2] * v.y + m[3][2] * v.z + m[4][2]
   local z = m[1][3] * v.x + m[2][3] * v.y + m[3][3] * v.z + m[4][3]
   return vector.new(x,y,z)
end



[/spoiler]

[Casimir]

Looks great. Code?

[Aqua]

Is it possible to restrict an object so it can only be crafted by a certain surface for example

{}{}{} {}

thats the area but as you can see you could craft with the normal craft is there a way to stop that?

Umm. Can you explain clearer?

[ElectricSolstice]

Is there a more efficient way of removing a bunch of nodes other than calling remove_node on each of their positions? Turtles seem to only want to replace air.

EDIT: Haven't tried it yet, but maybe it's the VoxelManip I'm wanting to use?

Second EDIT: Well, VoxelManip works. Not sure of the difference yet, but it does work as an alternative, so will leave it with it.

[Chinchow]

Is it possible to restrict an object so it can only be crafted by a certain surface for example

{}{}{} {}

thats the area but as you can see you could craft with the normal craft is there a way to stop that?

Umm. Can you explain clearer?

Imagine the area I just showed
[] [] [] []
is the crafting area made with a special block
NNow objects crafted with this could also be made with the normal craft area
II would like to restrict certain objects so they can only be crafted with this.

[LionsDen]

Is it possible to restrict an object so it can only be crafted by a certain surface for example

{}{}{} {}

thats the area but as you can see you could craft with the normal craft is there a way to stop that?

Umm. Can you explain clearer?

Imagine the area I just showed
[] [] [] []
is the crafting area made with a special block
NNow objects crafted with this could also be made with the normal craft area
II would like to restrict certain objects so they can only be crafted with this.

I haven't done this myself, but if you look at the technic mod, specifically the alloy furnace it might give some insight into doing what you want.

[jojoa1997]

How would I get the group of a node and change it via minetest.registered_tool()

[Chinchow]

As you can see this code is merely the farming growth abm changed a little however when I run the mod it is because of the end portion it won't run. Does anyone know why?

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Code: Select all

minetest.register_abm({
    nodenames = {"group:plant_wheat"},
    neighbors = {"group:soil"},
    interval = 90,
    chance = 2,
    action = function(pos, node)
        -- return if already full grown
        if minetest.get_item_group(node.name, "plant_wheat") == 8 then
            return
        end


[aleksix]

As you can see this code is merely the farming growth abm changed a little however when I run the mod it is because of the end portion it won't run. Does anyone know why?

You forgot the last "end" for "function".
Here:

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Code: Select all

minetest.register_abm({
    nodenames = {"group:plant_wheat"},
    neighbors = {"group:soil"},
    interval = 90,
    chance = 2,
    action = function(pos, node)
        -- return if already full grown
        if minetest.get_item_group(node.name, "plant_wheat") == 8 then
            return
        end
    end


[Gronx]

A couple of questions if I may. I'm going to have a go at generating small settlements and villages but I'd like to start with the best tools for the job.

1: What are the pros and cons of the schematic api and the world edit mod? Is there an appreciable speed difference?

2: Does anyone know of a mod which uses the schematic api. It's a lot easier to do if you have a working example.

[aleksix]

Is it possible to generate nodes on the fly?

[ElectricSolstice]

What dimensions are the chunks in minetest? (length, width, and height)

[Nore]

Is it possible to generate nodes on the fly?

Yes, but they won't be visible on the client until it is disconnected and connected again (on a server)

What dimensions are the chunks in minetest? (length, width, and height)

There are the blocks, which are 16x16x16 nodes, and the chunks (used for mapgen), which are 5x5x5 blocks.

[ElectricSolstice]

Is it possible to generate nodes on the fly?

Yes, but they won't be visible on the client until it is disconnected and connected again (on a server)

What dimensions are the chunks in minetest? (length, width, and height)

There are the blocks, which are 16x16x16 nodes, and the chunks (used for mapgen), which are 5x5x5 blocks.

Thanks ^_^ I guess what I'm really wanting to know is how far away from yourself would the blocks start unloading. Would be useful information for figuring out how to deal with connected cables when part of the connection isn't loaded.

[aleksix]

Is it possible to generate nodes on the fly?

Yes, but they won't be visible on the client until it is disconnected and connected again (on a server)

Actually,it looks like it's crashing server(singleplayer emulates server,right? 4.7.7-stable) but whatever .Too bad I didn't know that before trying to do my 3d printer.

[fairiestoy]

Hey guys,

i totally stuck on this problem and finally decided to ask here in the forum. Its about this: I wanted to create a furnace which is not working with ABMs too make sure that server lags are causing to much of time loss as well as having a furnace which is capable of working even when the chunk is not loaded. But for some reason, i get the same annoying error over and over again.

This line is the one which bothers me with the error that temp_stack is a nil value after trying to access fuel.item. I know that this should be nil but only if the method call minetest.get_craft_result() fails. And thats the tricky part: I don't get why it is failing.

Would be nice if someone could point me to my mistake -_-

Greetings

[derpswa99]

how do you use the range for tools thing

[Evergreen]

how do you use the range for tools thing

Just put this into the tool definition. (replace 10 with whatever range you want)

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Code: Select all

range = 10,

[derpswa99]

how do you use the range for tools thing

Just put this into the tool definition. (replace 10 with whatever range you want)

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Code: Select all

range = 10,

Sorry, but can I get an example

[derpswa99]

how do you use the range for tools thing

Just put this into the tool definition. (replace 10 with whatever range you want)

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Code: Select all

range = 10,

Sorry, but can I get an example

[Evergreen]

how do you use the range for tools thing

Just put this into the tool definition. (replace 10 with whatever range you want)

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Code: Select all

range = 10,

Sorry, but can I get an example

Fine, if you say so. (You should know what things to replace in this code)

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Code: Select all

minetest.register_tool("default:pick_stone", {
    description = "Stone Pickaxe",
    inventory_image = "default_tool_stonepick.png",
    range = 3,
    tool_capabilities = {
        full_punch_interval = 1.3,
        max_drop_level=0,
        groupcaps={
            cracky = {times={[2]=2.0, [3]=1.20}, uses=20, maxlevel=1},
        },
        damage_groups = {fleshy=3},
    },
})


[derpswa99]

It doesnt work is there an error in my code becuse it's not working
here's the code, please post any problem you see

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Code: Select all

minetest.register_tool("meteor:meteor_laser", {
    description = "Meteor Laser Gun",
    inventory_image = "meteor_tool_laser.png",
    range = 15,
    tool_capabilities = {
        full_punch_interval = 0.1,
        max_drop_level=1,
        groupcaps={
            cracky = {times={[1]=0.03, [2]=0.02, [3]=0.01}, uses=1000, maxlevel=1},
        },
        damage_groups = {fleshy=10},
    },
})

Unfortanely there is no error showing in the debug.txt but it just does not work, sorry, but i cant do anything about. I want to fix this this as fast as possible so I can release this mod but I cant

[Evergreen]

It doesnt work is there an error in my code becuse it's not working
here's the code, please post any problem you see


minetest.register_tool("meteor:meteor_laser", {
description = "Meteor Laser Gun",
inventory_image = "meteor_tool_laser.png",
range = 15,
tool_capabilities = {
full_punch_interval = 0.1,
max_drop_level=1,
groupcaps={
cracky = {times={[1]=0.03, [2]=0.02, [3]=0.01}, uses=1000, maxlevel=1},
},
damage_groups = {fleshy=10},
},
})

*sigh* Please post the full error from debug.txt. Also, please use the "code" tags instead of plain text.

[Chinchow]

I've encountered a new error, if I put this:

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Code: Select all

for c=1,2,3,4,5,6,7,8 do

I get "do expected near ,"

If I put this:

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Code: Select all

for c=1,8 do

I get "attempt to concatenate global 'c' a nil value"
Any fixes?

[general3214]

how do you use the range for tools thing

Just put this into the tool definition. (replace 10 with whatever range you want)

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Code: Select all

range = 10,

Do you know the normal value for the range?