Unity C# Coding Practices #1, Destroy a cube into pieces

In this video we will destroy cube into pieces and give it an explosion effect. We will use OnTriggerEnter, CreatePrimitive and AddExplosionForce.
Download Script:
drive.google.c...

[@learngamecreating1308]

Don't forget to open SUBTITLES for details. Leave a commend for your questions. Experts will help you. Let's learn together, help each other.

[@natalieweishuhn521]

#youreWelcome using System.Collections; using System.Collections.Generic; using UnityEngine; public class Explosion : MonoBehaviour { public float cubeSize = 0.2f; public int cubesInRow = 5; float cubesPivotDistance; Vector3 cubesPivot; public float explosionForce = 50f; public float explosionRadius = 4f; public float explosionUpward = 0.4f; // Use this for initialization void Start() { //calculate pivot distance cubesPivotDistance = cubeSize * cubesInRow / 2; //use this value to create pivot vector) cubesPivot = new Vector3(cubesPivotDistance, cubesPivotDistance, cubesPivotDistance); } // Update is called once per frame void Update() { } private void OnTriggerEnter(Collider other) { if (other.gameObject.name == "Floor") { explode(); } } public void explode() { //make object disappear gameObject.SetActive(false); //loop 3 times to create 5x5x5 pieces in x,y,z coordinates for (int x = 0; x < cubesInRow; x++) { for (int y = 0; y < cubesInRow; y++) { for (int z = 0; z < cubesInRow; z++) { createPiece(x, y, z); } } } //get explosion position Vector3 explosionPos = transform.position; //get colliders in that position and radius Collider[] colliders = Physics.OverlapSphere(explosionPos, explosionRadius); //add explosion force to all colliders in that overlap sphere foreach (Collider hit in colliders) { //get rigidbody from collider object Rigidbody rb = hit.GetComponent(); if (rb != null) { //add explosion force to this body with given parameters rb.AddExplosionForce(explosionForce, transform.position, explosionRadius, explosionUpward); } } } void createPiece(int x, int y, int z) { //create piece GameObject piece; piece = GameObject.CreatePrimitive(PrimitiveType.Cube); //set piece position and scale piece.transform.position = transform.position + new Vector3(cubeSize * x, cubeSize * y, cubeSize * z) - cubesPivot; piece.transform.localScale = new Vector3(cubeSize, cubeSize, cubeSize); //add rigidbody and set mass piece.AddComponent(); piece.GetComponent().mass = cubeSize; } }

[@stodgystarch4798]

I don't know if this is already somewhere in the comments, but something this explosion script does is overpopulate the scene with new cubes, so here is a quick fix for it :) in the createPiece function, at the very bottom, insert this little bit of code for an automatic deletion of the pieces so you don't encounter lag : Destroy(piece, UnityEngine.Random.Range(0.5f, 5f)); What this does; it grabs every new piece you just created, destroys is in a randomized way, clearing your now *very* populated hierarchy in a way that all the tiny cubes don't go away at once, making it look a bit more natural. Hope that helps :D

[@learngamecreating1308]

Yes, there is a comment like that but random idea was awesome. well done my friend and thank you for sharing

[@erjuanjojj]

only one video?? this is one of the best tutorial formats I've ever seen, direct and detailed, please do more :(

[@kagigreenscreen]

oh this is very very nice coding thank you for this many thanks and thanks for the download script etc makes old slow unity learner very happy :)

[@youssefabdulaziz2133]

that's amazing,keep going,pal👍👍

[@CustomClass5]

This was an excellent tutorial.

[@mohsinnaseer4127]

explosionPos, explosionUpward, explosionRadius is not defined in video

[@matanyamin1]

Fantastic video! Very clear and straight forward. Thanks.

[@GameDevNerd]

Clever little bit of code!

[@tonysang3660]

exactly what i'm looking for thank you so much!

[@oscarkiloproductions5860]

Hello! I was just wandering if sometime you could create a tutorial on how to make a grenade that when it explodes, it leaves a crater. It would be great for my new game!

[@casper2277]

Thanks! The tutorial was easy to follow and the explosion looks amazing👍🏻

[@anix7533]

Can you help me ? Unity says that there is a compiling error with the script but VS code doesn't find any problem

[@Zarakikov]

Very nice, thank you!

[@brunosallesdev]

Great technique!

[@d-bi5960]

Thank you for a very good script))

[@acanaldelbuencontenido]

Amazing video, thanks.

[@rahulkukreti6491]

Excellent, Thanks alot :)

[@xilongzhang6856]

Could anyone tell me how to define explosionRadius, explosionForce and explosionUpward? 😭 I don’t know what are they, and they are not defined...

[@xilongzhang6856]

ohh for anyone that is wondering. I found it in the file linked in description. He skipped a few code in the video but you can find it when you download the code x

[@itamarashofiniaw.a.6394]

@@xilongzhang6856 Thanks a lot!

[@Alex-tn7pv]

Great stuff!!!!

[@mohamedahmedahmedfathi9382]

This is an amazing script thank you very much

[@batuhanartan]

Great Tutorial .. .thank you very much :)

[@melom.]

What about the cutted objects (explosion radius, explosion force and explosion Upward?)

[@Daviality]

Very goods script! I modified it so I can use this on thin cards

[@ЕвгенийШиряев-г5х]

Thanks a lot, very helpful

[@ManaBlend]

Thank you! So much verygood script🎁

[@Aliozka]

Hey great tutorial thanks.. How do you change the colour of the cubes after the blast.. Thank you..

[@learngamecreating1308]

This is the most asked question :) read comments

[@Aliozka]

@@learngamecreating1308 i manage to do it 👍😅

[@learngamecreating1308]

@@Aliozka Perfect, sorry for late answer

[@Aliozka]

@@learngamecreating1308 no worries mate👍ones again great tutorial thank you 👌🏼👏

[@Adul1k]

@@Aliozka how did you do it please :-)

[@tim6873]

Amazing work! Can even work with "Bullets" !! thank you! Make more videos please and thank you

[@deadly_artist]

thank u u broke my unity

[@learngamecreating1308]

Did you fix your unity? can we help you?

[@deadly_artist]

I did, always breaks whenever I run that program though

[@veggiearchon5778]

thank you man it worked perfectly :D

[@jontyblair8034]

Very nice thanks man👌

[@learngamecreating1308]

Follow for more, new tutorials coming

[@omercenikli2654]

Thank you for video. Nice job

[@wariskbr]

Very Helpful, Appreciate it

[@anix7533]

Thank you so much for this video!

[@L33T_Taco]

Thanks for the tutorial @LearnGameCreating quick question thought what can i do to the code to make the cube explode outward in a specific direction? like say if i applied this to a moving object, which i have done successfully, how would i make the explosion throw the smaller cubes forward in the direction its going.

[@learngamecreating1308]

use smaller mass, and let engine do it for you

[@TheShiftingSounds]

How come anyone dislike! Amazing work a d thanks. Will work on this tomorrow.

[@learngamecreating1308]

thank you

[@funkupgamer5364]

Awesome...!!

[@vilanstrikegaming5114]

Does it work for spheres

[@rinodipaola761]

Congratulations! Thank you

[@starchaser28]

This is awesome! Is there a way to define another model that results from the explosion rather than smaller cubes? Like butterflies. :)

[@learngamecreating1308]

Yes, you can do it, //add prefab variable top of script public GameObject piecePrefab; //old code (create cubes) piece = GameObject.CreatePrimitive(PrimitiveType.Cube); //new code (create any object) piece = Instantiate(piecePrefab, new Vector3(0, 0, 0), Quaternion.identity); //you can set position when you create or, after create like we did in script //don't forget to drag&drop your butterfly prefab to scripts "piecePrefab" variable in editor. good luck 🤞

[@stevendeprez5392]

came for the tutorial stayed for the music

[@learngamecreating1308]

Perfect :)

[@XONRk]

I was looking for this for a million years Just kidding 😁

[@umeshy]

Good tutorial! thanks

[@atakanbacak8281]

for everyone public float explosionForce = 50f; public float explosionRadius = 4f; public float explosionUpward = 0.4f;

[@chris.s.m.r4989]

you are mi savior

[@loganjones7872]

Friend, great video. However, can you help me understand why you must subtract pivot distance and what is it exactly.

[@learngamecreating1308]

Because main cubes pivot is center of object, if we create pieces over this pivot point (we adding positions to object position (center point)) so pieces was moving side, if you check there in video again, you will notice, that's why we calculate half of the cube, and subtract that position from pieces, then new created cubes same position as old destroyed cube. I hope it's clear now, good luck, best wishes

[@urospocek4668]

You didn’t set explosion Force, Radius and Upward but you have use them!?? How to define them to work?????????????

[@茨城童子-n1i]

Look at 4:48. explosion Force, Radius and Upward are public variable

[@dimitrioskoulialis6117]

Thanks for the tutorial really helpful! What is the name of the song in the background?

[@learngamecreating1308]

Nice to see it helps you, music : Exotics - Kevin MacLeod

[@MadhanLeMan]

Thanks!. And can we add a custom GameObject instead of using cubes. I tried adding a public GameObject piece and it didn't work any ideas??

[@learngamecreating1308]

Yes, you can do it, //remove this line piece = GameObject.CreatePrimitive(PrimitiveType.Cube); //with this piece = Instantiate(piecePrefab); //so we will Instantiate a custom prefab, not Cube primitive. //And declare a prefab variable at the beginning of the script public GameObject piecePrefab; //then drag&drop your prefab in this variable in the editor

[@bulletsponge6920]

How could I adjust the code to have the size adjust to the cube size? For example I have three cubes with different x,y, and z, lengths, but when hit, it all makes the same explosion. I like the sizes of the pieces themselves, I just want the pieces to fill the bigger or wider or taller cubes

[@learngamecreating1308]

I'm gonna make another video about random explosion effect

[@djukicdev]

Thanks dude.

[@learngamecreating1308]

Follow for more, new tutorials coming

[@unamattina6023]

where did explosionRadius came from?

[@xilongzhang6856]

I want to ask this as well. Where do we get that

[@learngamecreating1308]

I Forgot to put it in the video, check scipt, it's just a variable, public float explosionForce = 50f; public float explosionRadius = 4f; public float explosionUpward = 0.4f;

[@frkngz]

teşşekkürler çok hoş olmuş.

[@StackBrains]

DESTROY CUBE INTO PIECES, THIS IS MY LAST RESPAAAWN

[@TruuAmbition]

Anyone have tips on how to create the pieces from a pool of objects as to make the script more performant ?

[@PixelTB]

I need help, so I have a cube that is a player and it has movement scripts and all that stuff, and there are obstacles and I want when I hit an obstacle my player cube to explode

[@learngamecreating1308]

You can trigger an explosion when the collision occurs. Put this script to your player object, and check when to explode OnTriggerEnter function, as we did in example (we checked if it is the floor)

[@iskandermx]

Hi! Good work, how can change explotion no only color, texture too. Second question, i make a car and wanna exploition when car touch, how can make this? Best Regards.

[@learngamecreating1308]

//declare texture variable public Texture m_MainTexture; //put these lines to createPiece function material = piece.GetComponent().material; material.SetTexture("_MainTex", m_MainTexture);

[@jroy7408]

Great tuto, thanks! I was wondering whether someone knew how to give pieces the same colour as the main cube??

[@learngamecreating1308]

you can set cubes material color with this lines. //put these lines to createPiece function material = piece.GetComponent().material; material.color=Color.red; //Color.red or you can send a value as parameter, same as main cube's material.color

[@anix7533]

Hey Unity says I should fix some compile errors and that I cant use it bcs of this , but in VS there dont seem to be any errors

[@MrsAgathe]

Hello, I want my object to explode when I Press "E" for example, instead of Colliding with another object. Can you help me?

[@AlexJDev]

In the update function, call a getkey function and have explode() in that

[@aborayan5268]

awesome thank you

[@damirshabayev344]

cool tutorial works too

[@anix7533]

Really? Can you help me , Unity says that there is a compile error while there isn't any ( I even tried copy pasting his code and changing the name of the things that needed to be changed )

[@linkspecialproximity]

In my project i'm using OnCollisionEnter instead of OnTriggerEnter. I'm new to this stuff and i'm having a hard time figuring out how i am going to explode my cube when i come in contact with an obstacle. i am doing the same as this Pixel guy: "I need help, so I have a cube that is a player and it has movement scripts and all that stuff, and there are obstacles and I want when I hit an obstacle my player cube to explode". There's a player movement and collision script. when i just change "floor" into "Obstacle" it does not work and when i make the obstacles triggers they just fall through the floor haha. Any ideas?

[@saif_khan_gamers]

Change the tag of the object tht is colliding!

[@aleprivi4575]

Thank you very much for helping! but I have a problem can you help me? how do I change the color of the cubes that are generated? and how do I get rid of them after some time

[@learngamecreating1308]

Please read other comments, you will find the answer, thank you

[@sisitech]

I dont know if im gonna get any answer on this 3 years after the upload but I cna always try I used this on a prefab but it doesnt look good if a brown crate explodes into white cubes so is it possible to let it create/clone a prefab instead of a cube //create piece GameObject piece; piece = GameObject.CreatePrimitive(PrimitiveType.Cube);

[@jung-zen]

Here's a comment left by LearnGameCreating (The creator of this video) replying to somebody with a similar issue: Yes, you can do it, //add prefab variable top of script public GameObject piecePrefab; //old code (create cubes) piece = GameObject.CreatePrimitive(PrimitiveType.Cube); //new code (create any object) piece = Instantiate(piecePrefab, new Vector3(0, 0, 0), Quaternion.identity); //you can set position when you create or, after create like we did in script //don't forget to drag&drop your butterfly prefab to scripts "piecePrefab" variable in editor. good luck 🤞

[@jung-zen]

I'm literally trying this right now, if you could let me know how you get on it would be much appreciated!:) Currently have an issue where the prefabs fall through the floor despite having set the colliders etc...

[@sisitech]

@@jung-zen I think I know why it goes trough I just had the same object but then I used the Prefab from my asset folder instead of from my hierarchy and now it works, only problem I have now is that it explodes very un realistic, It explodes and stays in a cube of small cubes

[@jung-zen]

@@sisitech Thanks for the reply, I’ll take a look at this ASAP and get back to you. Mine also faces the same issue

[@jung-zen]

@@sisitech Try bumping up the explosion force, by that I mean try 3000 or higher.

[@coolride1401]

can you make a video of cutting objects?

[@learngamecreating1308]

For sure

[@refikugur212]

How can i explode like 10 1 1 cube rectangle one, where collision happens? like from corner

[@Minebender9]

Hey, just wondering how to make the pieces have no gravity, and also make the color orange, (none of the comments worked for me). Someone PLS help. Thanks!

[@thefunny_69]

Minebender9 watch a youtuber named brackeys and look at his how to make a game tutorial and it will teach you everything you need to know

[@headshotgamer7422]

It works m, thanks

[@arnaudb4357]

when i use this script all obects in my scene fly in the air thats fun haha i dont understand why but now i seriously need it triggered on explosions is it an easy thing to do? (sorry french guy speaking english)

[@learngamecreating1308]

Your english flows :) But i can't understand "triggered on explosions" You can trigger it when ever you want, i used trigger collision, you can explode it from your code when ever you want

[@arnaudb4357]

@@learngamecreating1308 I would like to trigger the explosion of gameobjects that are props or walls with a shock wave or a blast. I tried to give the particles several physical properties but the only way it works is with the contact between polygons. I would blowup a max of objects on my map now hahaha ^^ I adapted my script with the different names of particles that I use in my scene but without result :( (im a beginner in C# i use C usually so its hard to adapt even if its similar in lot of ways)

[@learngamecreating1308]

@@arnaudb4357 Ok, you want to filter rigidbodies in AddExplosionForce, cause your all objects explode. Vector3 explosionPos = transform.position; Collider[] colliders = Physics.OverlapSphere(explosionPos, explosionRadius); foreach (Collider hit in colliders) { //check colliders gameobject layer or tag //ofcourse don't forget to set your walls or props tags to 'walls' or whatever you want if (hit.gameObject.tag=="walls") { Rigidbody body = hit.GetComponent(); if (body!=null) { body.AddExplosionForce(explosionForce, explosionPos, explosionRadius, explosionUpward); } } }

[@arnaudb4357]

@@learngamecreating1308 You are very helpful! Merci beaucoup! Im gonna try to understand C# better but i may will be back with more questions hehh Usually i make destroyable objects in blender but it's a long process to make them usable and not too greedy on the performance.

[@learngamecreating1308]

@@arnaudb4357 Your welcome my friend, i will make more videos, follow

[@xinyueyang1962]

BGM is outstanding

[@Thesupperals]

This is not the best practice. Sure, diagnosing so that code is functioning correctly is a good practice but what you are doing can be achieved with a coroutine, using addressables, not getting components, not adding a rigidbody and not using physics at all. You should think about using a particle system that utilizes an animation trim sheet while things are in air. As soon as they collide and die, you can instantiate an object in place of the dead particle and if you must- add a mesh collider to that instantiated object. On top of all that, the last thing to do is add another coroutine to destroy the object if it commonly occurs. This is best practice. Heck, don't get me started on Enums, Dictionaries, object pooling, Data Abstraction and Scriptable Objects.

[@ecel_style]

I think you should make educational videos too :)

[@gustavjakobsen4160]

Is there a way to have the cubes destroy themselves after they hit the ground?

[@learngamecreating1308]

If you want to check collision with floor it would be more complicated, but an easy way i can suggest you to use Destroy command. //just put this line to end of createPiece function Destroy(piece, 3); //3 means after 3 seconds, remove object from scene. You can tweak it as you wish :)

[@luiscarloscajas4823]

cool ass video bro

[@zaraali2169]

works! thx!

[@breakfastboi3344]

When ur hp is at 0

[@teetehi]

Can this code be used on any object for example a tree if I click it it exploded if I make the correct modification to the code and if so can you tell me what to change?

[@learngamecreating1308]

A lot of questions about that, i will post a new tutorial about custom object exploding. But if i should answer, Yes, you can do it, You need small stick mesh objects. //add prefab variable top of script public GameObject piecePrefab; //old code (create cubes) piece = GameObject.CreatePrimitive(PrimitiveType.Cube); //new code (create any object) piece = Instantiate(piecePrefab, new Vector3(0, 0, 0), Quaternion.identity); //you can set position when you create or, after create like we did in script //don't forget to drag&drop your stick prefab to scripts "piecePrefab" variable in editor. good luck 🤞

[@upperarmhumor]

I used this technique as a crash effect in a test game I made connect.unity.com/mg/other/block-juke

[@skodaskoda6633]

how to choose color for explosion objects?

[@learngamecreating1308]

You can set color in createPiece() function, add this line; piece.GetComponent().material.color = new Color(255,0,0); //RGB red

[@skodaskoda6633]

Thank you Bro!!!

[@kristianulrych6094]

Is there a way how to make each different part of exploded cube colored?

[@dubdub9747]

Yes, when creating the cubes, you can access the Renderer for that cube and assign a material. Now you've just got to create the materials you want to use. There are a few ways of doing it, but I'd suggest creating a 'System.Random' object (which will generate random numbers, part of .NET library). You then create a new material, and set the color of the material to a new 'Color' object. In the constructor, generate three values between 0-1 for the new color. Ends up looking something like this: piece.GetComponent().material.color = new Color((float)rand.NextDouble(), (float)rand.NextDouble(), (float)rand.NextDouble()); Note: When creating the 'System.Random' object, make sure it's not inside the 'CreatePiece' method, it should be at the top of your script as a private variable, you can initialise it there as well.

[@elnurdamirov556]

Hello bro.How can i change tag of the created pieces through script

[@learngamecreating1308]

Declare the tag in the tag manager, then //put this in createPiece function piece.tag = "TagName";

[@aryan.puthran]

How do you make it so when you hit a trigger further away, you can see the cube fall and break?

[@blastback27]

one intuitive way is that you can make a sphere and put it part of the "exploding object" so a child of it and make that sphere as large as the range of where you want the trigger to start, uncheck the sphere meshes (so you cant see it) and make that sphere's collider a trigger and now do the same thing that he did, is just that within the code of the sphere make a trigger code like we see at the earlier part of the video when it says "onTriggerEnter" make that function for the sphere and make another script for the object that is exploding as he did, all you need to say in the code for the sphere is that when it is triggered, then call the function in the "exploding-object" code that is separate, to do so you just type FindObjectOfType()." the methods name"(); and this will activate the function within the code of the "exploding-object" code. not in quotation ofc. And if you wanna know what function he called check the same part and try to figure the rest out, which should be self-explanatory.

[@blastback27]

Or use if (Physics.CheckSphere(transform.position, sphereRaduis, LayerID)) when it returns true then it will run the code you put in, which is the same one as the onTriggerEnter stuff..

[@aryan.puthran]

Ok! Thank you!

[@equinox1346]

How can i change the colors of the pieces?

[@aborayan5268]

How to destroy after a period?

[@samduartec]

@Amine Kh that doesnt work because the object with the script is no longer active

[@alphaspace1100]

thx

[@bittublastgamer202]

can you help my bosx is not exploding

[@atakanbacak8281]

you forgot public float explosionForce = 50f; public float explosionRadius = 4f; public float explosionUpward = 0.4f;

[@mrcryptographic4803]

how can i have the piece destroyed after a certain time in this script?

[@thewildreamer]

you can use Invoke("functionname",time by f); for example : Invoke("explosion",2f);

[@mrcryptographic4803]

@@thewildreamer i mean how can i destroy the piece after a time and not how can i spawn the explosion after a time. or did I not understand something?

[@The_Mavrik]

Классный урок. Но почему у тебя всего 1 видео на канале???

[@learngamecreating1308]

Thank you, new content will be coming soon.

[@Adul1k]

how do I change material of those small cubes ?

[@dubdub9747]

Get the 'Renderer' component for the cube, then select the material propery, and assign it to the desired material (for example, if you want it to be the same as the original cube, you want (gameObject.getComponent().material)

[@aniketmeghani1627]

i learn about make game how can i start???

[@learngamecreating1308]

You started already, keep going!

[@adamhilali806]

why it doesn't work it really help me sure but it didn't work

[@mateus10pras14]

My Unity crashed at 02:22 and my computer is a i5 8400 + rtx 2070 super + 16 gb ram

[@kumelogames]

how do you change color

[@learngamecreating1308]

//put these lines to createPiece function material = piece.GetComponent().material; material.color=Color.red;

[@djukicdev]

​@skipsbiceps assign public Material red; , then just use it wherever you need as piece.GetComponent().material = red; Dont forget to link mat in inspector tho

[@Adul1k]

How can I destroy those cubes after like 2 seconds ?

[@MamMam-zo1sm]

Destroy(Gameobject , time);

[@LEARN-UNITY3D]

Wow its working ! But i want to k ow how to destroy these cube pieces bcos it makes pollution in my game! Please if u can solve this

[@manuelabarcacrespo8298]

Destroy(cube, time);

[@mohsinnaseer4127]

oh i copied from drive script by the way thanks for the video

[@factsspace8326]

You can slow down your speed and explain the code to us it would be so nice

[@learngamecreating1308]

thank you for your feedback. i explain everything in subtitles. Did you try it? I hope you like it.

[@bonniedunlap2399]

Bonnie Dunlap

[@hanssarpei8687]

How can I destroy this pieces?

[@larcondos909]

In the section of code at the end of "createPiece", you can add another script that destroys those pieces after some condition (Say, 2 seconds, or on touch)

[@learngamecreating1308]

as Larcondos mention above; //just put this line to end of createPiece function Destroy(piece, 3); //3 means after 3 seconds, remove object from scene.

[@afkfish4368]

it is not working like the code it say that i need to fix it

[@KamikazeSensei]

try changing the name for your script to "Explosion"

[@oppenheimeroficial]

Same... function turns red... feels like he's just making the functions up

[@아이디없음-t1b]

Script is not working