Fabric Modding Tutorial - Minecraft 1.20: Advanced Item | #6

Summary

This Minecraft modding tutorial introduces how to create a custom advanced item, specifically a metal detector. The item is coded with its own class, allowing unique functionalities such as checking for valuable blocks below the clicked block and notifying the player with coordinates. The tutorial covers item class creation, method overriding, and integrating the item into the game, including durability and damage handling. The metal detector item showcases the potential of modding to enhance gameplay with interactive, functional items.

Takeaways

• 🛠️ The tutorial focuses on adding a custom advanced item to Minecraft, specifically a 'metal detector' item that can detect valuable blocks like iron or diamond ore.
• 📦 The item is created within its own package for organizational purposes, following the convention of naming custom items with 'item' at the end.
• 🔧 The 'metal detector' item extends the base item class from the Minecraft modding API, allowing for the addition of custom functionality.
• 📝 The 'useOnBlock' method is overridden to implement the item's special behavior, which involves checking for valuable blocks below the clicked position.
• 🗄️ The script checks if the server is running the code (not the client) using 'context.getWorld().isClient' with a negation to ensure server-side execution.
• 🔍 A for loop is utilized to iterate through blocks below the clicked position, checking each block's state to determine if it's a valuable block.
• 💎 The 'isValuableBlock' method is a custom method that determines whether a block is considered valuable, such as iron or diamond ore.
• 📢 When a valuable block is found, the item outputs the block's coordinates to the player, and the item is damaged to simulate use.
• 🔨 The item has a durability limit set through 'fabric item settings', which determines how many times it can be used before breaking.
• 📝 The tutorial concludes with the item being registered within the mod and tested in-game, demonstrating its functionality and durability.

Q & A

What is the main focus of the tutorial described in the transcript?

The main focus of the tutorial is to add a custom advanced item, specifically a metal detector, to Minecraft using modding.

What does the term 'advanced item' refer to in the context of Minecraft modding?

In the context of Minecraft modding, an 'advanced item' refers to an item that has its own item class, allowing for the implementation of custom functionality beyond the standard capabilities of basic items.

Why is it recommended to end the name of custom items with 'Item' in Minecraft modding?

It is recommended to end the name of custom items with 'Item' to clearly indicate that the class is an item class, which helps with organization and understanding within the codebase.

What method is used to define the behavior when the custom item is used on a block?

The 'useOnBlock' method is used to define the behavior when the custom item is used on a block in Minecraft modding.

How does the metal detector item determine if a block is valuable?

The metal detector item determines if a block is valuable by checking if the block state is of iron ore or diamond ore using a custom method called 'isValuableBlock'.

What is the purpose of the 'foundBlock' variable in the metal detector item's functionality?

The 'foundBlock' variable is used to track whether a valuable block has been found during the search process. It is set to true when a valuable block is detected.

Why is it important to check if the code is running on the server and not the client in the metal detector item's functionality?

It is important to check if the code is running on the server and not the client to ensure that the block checking and item damaging logic only occurs on the server, preventing potential client-side exploits or inconsistencies.

How does the tutorial handle the durability of the metal detector item in Minecraft?

The tutorial handles the durability of the metal detector item by damaging it by one each time it is used to find a valuable block, with a maximum durability set to 64, after which the item will break.

What is the role of the 'use' method in the context of the custom metal detector item?

The 'use' method in the context of the custom metal detector item is called when the player uses the item without targeting a block, but in this tutorial, the focus is on the 'useOnBlock' method for the item's functionality.

How is the metal detector item registered within the modding framework as described in the transcript?

The metal detector item is registered within the modding framework by creating a new instance of the item class in the 'ModItems' class and setting its properties, such as max damage, and then adding it to the item group.

Outlines

00:00

🛠️ Crafting a Custom Advanced Item in Minecraft

The script begins with an introduction to adding a custom advanced item to Minecraft, specifically a 'metal detector' item. The tutorial covers the process of creating a new item class within the Minecraft modding framework. The item class is named 'metalDetectorItem' and extends the base item class from the Minecraft codebase. The script emphasizes the importance of overriding methods such as 'useOnBlock' to add functionality, allowing the item to interact with the game world. The 'useOnBlock' method is particularly highlighted, where the item checks for valuable blocks below the clicked block and outputs their coordinates if found. The script also touches on the necessity of server-side execution, using '!context.getWorld().isClient' to ensure actions are performed on the server. The process of creating helper methods like 'isValuableBlock' and 'outputValuableCoordinates' is outlined, along with the item's durability and damage mechanics.

05:01

🔍 Implementing and Testing the Metal Detector in Minecraft

The second paragraph delves into the implementation and testing of the custom 'metalDetectorItem' within the Minecraft game. It describes the process of registering the item within the mod's item group and setting its properties, such as maximum durability. The tutorial demonstrates how to add the item to the game's item group and configure its settings, including the texture and model. The script includes a practical demonstration within the game, where the metal detector is used to find valuable ores like iron and diamond. The item's functionality is showcased as it outputs the coordinates of found ores to the player's chat. The tutorial concludes with the item's durability decreasing with each use, eventually breaking after a set number of uses, showcasing the item's lifecycle within the game.

Keywords

💡Minecraft modding

Minecraft modding refers to the process of modifying or enhancing the game Minecraft by adding new features, items, or behaviors that are not part of the original game. In the context of the video, modding is the main theme, as the tutorial focuses on adding a custom advanced item to Minecraft, showcasing how modders can extend the game's functionality.

💡Custom Advanced Item

A custom advanced item in Minecraft modding is a non-standard item that has its own unique class, allowing for specialized behaviors and interactions within the game. The video tutorial is centered around creating such an item, specifically a 'metal detector,' which demonstrates the concept by adding new capabilities to the game.

💡Item Class

In object-oriented programming, particularly within the context of Minecraft modding, an 'item class' is a blueprint for creating items with specific properties and behaviors. The video script describes creating an 'item class' for the metal detector, which extends the base item class to include custom functionality.

💡Use on Block Method

The 'use on block method' is a programming method in Minecraft modding that defines what happens when a player uses an item on a block. In the script, this method is overridden in the custom item class to make the metal detector check for valuable blocks below the clicked position.

💡ActionResult.Success

In Minecraft modding, 'ActionResult.Success' is a return value that indicates an action was successful. The video mentions returning this value to provide a swinging animation when the metal detector item is used on a block, enhancing the player's interaction feedback.

💡Server-Side Code

Server-side code refers to programming that runs on the server in a multiplayer game environment. The script includes a check for server-side execution to ensure that the metal detector's functionality, which involves checking blocks and sending messages, only occurs on the server and not on the client.

💡For Loop

A 'for loop' is a control flow statement that allows code to be executed repeatedly based on a condition. In the video, a for loop is used to iterate through blocks below the clicked position to search for valuable blocks, demonstrating a common programming structure in game logic.

💡Is Valuable Block Method

The 'is valuable block method' is a custom method created in the script to determine if a block is considered valuable, such as iron or diamond ore. This method is crucial for the metal detector's functionality, as it defines the conditions for when the item activates.

💡Output Valuable Coordinates

In the context of the video, 'output valuable coordinates' refers to the action of displaying the location of a valuable block found by the metal detector in the game's chat. This feature provides feedback to the player about the item's interaction with the game world.

💡Durability

Durability in Minecraft refers to the amount of use an item can withstand before breaking. The video script includes code to damage the metal detector item each time it's used, reducing its durability until it breaks, simulating real-world tool wear and adding a layer of strategy to the item's use.

💡Mod Items Class

The 'mod items class' is a central class in Minecraft modding where new items are registered and configured. The script describes registering the metal detector item within this class, which is essential for making the custom item available in the game.

Highlights

Introduction to adding a custom advanced item to Minecraft modding.

Explanation of what constitutes an advanced item in Minecraft modding.

Creating a new Java class for the custom item named 'metal detector item'.

The importance of naming conventions for custom item classes.

Extending the item class from net.minecraft.item.

Adding custom functionality to the item class through methods like 'useOnBlock'.

Overriding the 'useOnBlock' method to implement custom behavior.

Using 'ActionResult' to handle the item's interaction with blocks.

Checking server-side execution with 'context.getWorld().isClient'.

Iterating through blocks to find valuable ones using a for loop.

Creating a custom method 'isValuableBlock' to determine valuable blocks.

Outputting the coordinates of valuable blocks to the player.

Damaging the item after each use to simulate durability.

Registering the custom item in the 'ModItems' class.

Setting the maximum durability of the metal detector item.

Adding the custom item to the item group for in-game access.

Translation and item model JSON file setup for the custom item.

In-game demonstration of the metal detector item's functionality.

Conclusion and预告 of the next tutorial focusing on advanced blocks.

Transcripts

let's get to the cool stuff and add a

custom Advanced item to Minecraft

Minecraft modding courses with close to

100 topics ranging from Custom tools and

armor to custom block entities all the

way to custom mobs Linked In the

description below oh right we finished

that back and tell her once more in this

tutorial we're going to be adding a

custom Advanced item to our mod right

here and what I mean by an advanced item

that is an item that has its own item

class allowing us to do oh all sorts of

crazy things let me tell you and for

this in the item package we're going to

right click new a package and we'll call

this the custom this is done for

organizational purposes only so you

don't necessarily have to do this inside

of this though we'll make a new Java

class I'm going to call this the metal

detector item now this convention to end

the name of custom items with item over

here highly recommended to always do

this so you know that this is an item

class and this will extend the item

class right here from net micro item

we'll hover over this and create

Constructor matching super and with this

a because some item class is born

however it has literally zero custom

functionality and that's what we're here

for to take a look at what kind of

functionality you can add to this you

get middle Mouse button click on the

item class and you can take a look at

all of the crazy methods that are

available here and there are a lot of

things as you can clearly see now for us

what's interesting here is going to be

the use on block method right here this

one port when an item is used on a block

something else that might be interesting

is the use method as you can see this

one is basically called when the player

uses the item so that just means that

you're not looking at a block and you're

just right clicking this item and the

way to use them is to go into your

custom item class and to override those

methods so for example the use on block

method here is another example they use

on entity method which of course

logically would be called when you right

click with this particular item on an

entity and see in this case it refers to

any type of mobile basically but in our

case we want to use the use on block

method and we want to return the

actionresult.success over here so we

also get this like this swinging

animation when we actually right click

on the Block and what is our metal

detector item going to do well what

we're going to do is when you right

click a block it's going to double check

all of the blocks that are below that

block and as soon as it finds a valuable

block whatever whatever we're defining

it to be so for example an iron ore

block or a diamond ore block then it's

going to Output that we found that block

with the particular coordinates to start

we want to first of all say if

context.getworld.is client and then

there we go making a new statement and

now here very important we want to add

an exclamation mark here at the front

meaning that we're now on the server and

not the client this exclamation mark

does a lot of heavy lifting because it

negates the is client over here

basically making it so that we're only

inside of this if statement if we're on

the server and then we want to get some

variables so the first one is the blog

post that's just going to be the

position clicked over here and that's

going to equal to

context.getblog pass

we then want to say player entity

and that's going to be the player

getting this from context.getplayer

we also want a Boolean variable that's

going to be called the found block

that's going to be equal to false here

in this case and then we wanted to go

through a for Loop now this for Loop

looks like this basically we're going to

start with zero we're going to start at

the position that we've just clicked

we're going to go through all the way

until zero basically so we're sort of

subtracting from the Y level that we

have until we reach 0 and then we're

going to continue for 64 more blocks

because of course we now have the lowest

y level is now minus 64. then we're

going to get a block state that is the

block state that we're well basically

sort of currently evaluating that is

going to be done with being with doing

context dot get World dot get Block

State and then passing in the position

clicked dot down going down by I

basically as we're going through this

for Loop right I is going to increase so

we're going to go down one block at a

time and then evaluating that how are we

evaluating that we're going to say if is

valuable block and I'm passing in the

state right here then we want to do

something

now the first thing is wait it's

valuable Brock doesn't even exist

exactly that is a custom method that we

have to create ourselves so we're going

to hover over this and create that

method inside of our item class and we

want to return something and that is a

Boolean so let's just say we want to

check that the state is of

I want to say this is of the iron

underscore or or we can also say this is

status is of blocks dot diamond ore

there you go so if we right click on a

block and any block below that is an

iron ore block or a diamond ore block

then the is valuable block method is

true therefore we will now be inside of

this if statement and we can then output

valuable coordinates and what we need

for this well we need the coordinates to

Output so that would be position clicked

dot down and then passing in the I here

in the down we want to Output this for

the player so we should pass in the

player and we also want to pass in the

state but you know what we can actually

do the get Block over here because we

want to basically also say hey this is

the block that was basically found in

this position we will also do found

block is equal to true and then we will

also break out of the for Loop because

once we found one valuable I actually

want to be done with this there we go

and we can now create the output

valuable coordinates method as well

we're just going to change the name of

this to block pause that's a little bit

nicer and I'm going to copy over the

contents of this but they are pretty

straightforward you can see we're just

sending a message to the player that

just means that we're outputting

something into the chat basically and

we're going to do this as a literal text

over here we're just going to say found

and then this is going to well I'll show

you the name of the block that we found

at the position XYZ just written nicely

and then the overlay false just means

that it's not shown sort of in the

middle but it actually as a normal chat

message and then the question is well if

we are done over here with the for Loop

and we have not found a block where we

of course also want to do something and

we want to output something else and

that is going to be player.send message

and what we can do is we can just say

text Dot literal and we're just going to

say no valuables found awesome and the

last thing we want to do is we also want

to hurt this particular item so that

basically means that we're going to

damage this it's going to have a

durability of I mean whatever we choose

and it's going to take away one of those

durabilities when we right click so

we're going to say context dot get stack

dot damage we're going to damage it by

the amount of one we're going to say

context.getplayer and then we start

typing in player and you can see it's it

suggests us the consumer of player

entity we just hit tab to autocomplete

and we say player entity that send tool

break status and then passing in

playerentity dot get active hat and then

we'll make sure that the item inside of

our hand is also damaged and will break

accordingly once the max damage amount

is basically reached however right now

this particular metal detector class is

not used and you can see this because

this is gray and this is gray so the

name of the classes Ray as well as the

Constructor so let's go into the mod

items class and let's actually register

this so first I will just duplicate the

raw Ruby over here and I'm going to make

a metal underscore detector and of

course not forgetting to change the name

metal detector and you might be like oh

then we're already through but no wait a

second look at this again this is not

being used because what we need to do in

the mod items class this is extremely

important under the new item we now want

to create a new metal detector item

right here and you can confirm that

you've used this when the class name

trims right and the Constructor name

turns yellow you can also middle Mouse

button click on the Constructor and it

should take you to the mod items class

again absolutely spectacular I'm just

going to make another brake line over

here that it's a little bit easier to

read and then under the fabric item

settings we're also going to add the max

damage right here and that's going to be

let's say something like 64. so with

this metal detector item we can click 64

times and then it's going to be

destroyed as every right click we're

going to damage it by one now as for all

of the other items of course we still

need to add it to the item group that is

going to be very straightforward just

duplicating the entries that add over

here and then making this the metal

detector similarly adding the

translation should at this point be no

issue at all anymore same with the item

model Json file and let's copy over the

texture over here as well this is of

course going to be available to you for

download but those are all the steps

that we need for the custom Advanced

item here the metal detector so let's

jump into the game and see working all

right furnace is back in Minecraft and

let's just try and find some valuables

so you can see we find oh there we go I

actually already found some iron ore

over here here there we go that is at

minus 128 33 and minus 13 I mean of

course continue to well basically try to

find something diamond ore might be a

little bit harder to get to pull because

well I mean that's just it's going to be

rarer right so obviously it's going to

be not showing up as often and if we

just continue to right click with this

particular item and at some point you

can see the durability is going down and

it's going down and it's going down

until well the inevitable happens the

island breaks

so that is a custom Advanced item right

as always of course the code is going to

be available to you in the description

below in the GitHub repository but

that's gonna be it for this tutorial

right here next time we'll continue with

an advanced block right here hope to see

you there so yeah