Unity3D Physics - Rigidbodies, Colliders, Triggers 

I just wanted to say "Thanks a lot, Jason". I have been doing Unity game development as professional game developer for 5 years now and your videos even about the basic stuff still help me improve a lot. Please, keep up the good work.

Even though I've been using Unity for 2 years now, this helps me improve alot

i love how after you explain stuff 100 people already tried to explain me, i get it. all these people are too stuck in their current knowledge about the engine and scripting. while you can easly re-live your newbie days and explain if you are explaining it to passed you. and thats a skill to admire. well done sir

"We should be able to watch. Our ball. Fall." "Let's hit play" *Ball falls* *Blep* ._. *Thunderous applause*

thanks for this: I was going nuts tilting planes and not having objects fall off them and couldn't figure out what was going on. This video was really helpful and helped me understand Unity physics - my game might even work now :)

Even though I've been using Unity for a full week this has still helped me tremendously :D But seriously, it's videos like this that make all the difference, thank you!

Knew about most of those, but it's nice having a video explaining all the stuff, good job.

I know the basics of these but there were still quite a good things that I got from this. And that about swapping OnCollisionEnter with OnTriggerEnter, oh man, been there done that several times even in my limited experience with Unity. Good to know it keeps happening.

I literally am doing a lab due Monday on this subject as i got your notification. This helps alot!

Great video, very thorough. 26:55 In my limited experience I've found Force amounts are in the 100s, Rotation are in the 10s, and Movement are in the 1s. I was using the same value for rotation and movement speeds and spent hours trying to figure out why my thing wasn't rotating properly ... its was, just not very fast at all. Once I bumped that up it worked fine.

Very simple helpful and straight to the point. Thanks! This is a good introduction to all the physics stuff I plan on learning.

Nice video again Jason. I like that you have a good mix of beginner all the way through to advanced videos (something for everyone).

Thank you for the tutorial, this really got me. keep making other tutorials to help those who are still beginners and need knowledge in using unity like me XD

Finally, now I understood what was the problem in my game

Liked keyboard shortcut, then you started showing off Rider IDE Shortcuts. Lovely. As always, thanks for sharing the insights and things we might find useful :)

Thank you so much!! I have been struggling with this things since i got into Unity, you really helped me a lot

Excellent tutorial sir.. I am following all your videos. Thank you very much.

Excellent very Helpful. Life would be a lot simpler without any Physics

Loved the CTRL+SHIFT+F Shortcut for moving to Camera position shortcut, thanks. I'm here to learn more about using Physics and worried about physics and performance if I'm doing things wrong. Love your content. Hoping to delve more deeply into the massive world of "Destruction". Starting with C# Algorithms looping through mesh verts... Slooooow. Maybe through Voxels and on to Geometry Shaders.

AMAZING

All we want to say is "Thank you, Jason." as this is an alternative to the source engine in our eyes.

"Share the video, it helps more than anything else you can do" Wow... you really motivate people to do nothing else

I think something important to note that changed in 2019.3 due to an NVIDIA PhysX update is that trigger vs trigger colliders do not throw trigger callbacks to each other anymore. Other than that, great tutorial :) good job!

even though i just downloaded Unity, this tutorial helped bunches!

Nice tutorial about basics of physics system

Very well explained. Thanks!

I often see questions from people about why their characters are jittering when on the ground, or why triggers do not register when objects pass through, and I usually find in their code that they are moving the objects or characters with Transform.Translate which effectively bypasses the physics system with teleportation. They often think that as long as they do these types of movements in FixedUpdate, then it should not be an issue. Too often I see coders spending lots of time trying to recreate systems that the engine already does very well. The gravity system is a large source of confusion for newer coders, in this regard.

you brought me back to the counter strike days when you said "God Mode" lol, classic

France this video is awesome.

Thank You!

I've learned alot from this video! Thanks!

Thank you for showing us things that work, a refreshing change. Good job Jason, Merry Xmas and a Happy 2021 🎅🎄🌟✨🔔⛄️👏👏👏

Thank you

Really nice video! Congrats!

I just started unity and it is very confusing for me, but this video help with these stuff,Thanks

Thanks for the good explanation. It helps a lot. 잘 보고 가용~~~ ㅎㅎㅎ

Thank you very much for your efforts and awesome tutorial.

Very helpful, thanks!

So good

Thanks for another great video! You are the man!

super helpful thanks a lot

Hi Jason, Could you please make a video on PhysX limitations and best practices to avoid strange physics behaviour in Unity? I'm especially interested in the effects of the PhysX limitations on Unity joints. There is a lot of issues related to joints acting strange due to PhysX not being able to handle heavy objects with children connected using joints. Best regards

Thank you sir

great vid, thanks

Thanks!!!

Thank your very much for your Tutorial.

thank u

subscribed

Good video.

Thx duude

thanks for this video it is really awesome

16:35 Trigger vs Collisions

I see Jesse Schell's book of lenses in background :)

You are awesome

Hi Jason, massive thank you for these kind of videos, they are a massive help when getting my head around the engine. It's actually reminded me of a question that's been bugging me for a while. I'm trying to create a 2.5D type platformer but having a real problem getting my head around locking the movement to only two axis with the correct kind of physics to allow proper collisions with platforms etc. Can you suggest any good resources? (also, I agree with the comment about your shirt and your chair. You look like a floating head!).

Grate video. What abort a video like this but for animations :)

So the Rigidbody tells the object how to move, and the collider defines the physical boundary of the object

Hi Jason. Thanks for all the videos you brought to the game developer community. Really really helpful. May I ask you to consider to create a video/series on anti-cheating. In particular I have an interest in creating a puzzle game with a back-end service. All my user data and achievements I would like to have in the back end. So I would like to know what techniques high level are available to me to ensure that the user has actually completed the level. What I am thinking is some business logic, which checks the sequence, timing of the requests hitting the back end service, but really would like some advise from the professional with experience. Manny thanks.

I'm trying to make good rigidbody movement ...... for me the best is with rb.velosity ..... but you are professional so if you think something about rigidbody movement 😉 🤔

In the tile script. Where did you bind the A & D key in the script for the floor? BTW, great tutorial. 👍

great video man ! did some one told you that you look like dan harmon?

Nice!! I will try today... Jason, can you some day create a tutor using MULTIPLES BALLS COLLISIONS in Unity? i search about on RU-vid but no find nothing about... Thanks!!

Is there tutorial on how to push objects around the scene with players rigid body. Also need one to interact with virtual computer (switch from player camera to static on screen and back). TY

Hey there, how would you face the following problem : You have a sphere which represent a tennis ball You want the physic of the ball to be pretty realistic without having to implement complex laws of physics.

Why did super collider go on + off recently?

Many thx for this tutorial, Jason. I am very new, and this helped me a lot. I mean, a lot. That being said, I was trying to use this ChangeColorOnCollision script to have a surface (the same cube you used in the examples) change color when Ellen contacted it (ran it into it, or jumped on it). The player "Ellen" I refer to is the character in the Unity 3D game kit. And it does not work. I tried adding a rigidbody to Ellen (had to make her kinematic/else fall through floor) and a mesh collider, but still no avail. Also, I'm not sure if this is part of an update, from 2019.3 to 2019.3.6, which I am using, or maybe you forgot, but I had to change the "layer" of the gameObjects to "collider" for any of it to work. or, Did I miss something there? If you have time, could you please explain to me how to make the character cause this changeColor via collision? Many thx, Wannabee Dev 101

Great tutorial. I've seen in fighting games, shooters and other competitive games that you can apply collision shapes to each individual limb of a character and have each of them react differently depending on where it's hit (the most obvious example being headshots). Is there a way to parent collision shapes like cubes and capsules to a specific bone on the character's rig or is it more complicated than that? I know having too many collision checks and triggers could drastically slow down the game if I overdo it, but, you know, in case the need arises...

Make a video about full Android fps/tps multiplayer game

What code editor is being used? Love the tutorial!

if unity is the force, you are a luke skywalker. Thanks

So I set it up exactly as you did but my mesh fell through the floor :/ idk why

My man writing codes on light theme

Dots physics too?

Jason! Why'd u use Awake() instead of Start()?? Is it better?

Jason, is it okay to use a CharacterController instead of a Rigidbody in big game projects?

how do you add angular gravity for wall running

why does my player with a rigid body slightly clip through the ground when it lands

Does this apply to vr? I keep falling through floor

I don't understand why the balls jump higher and higher with a bounciness of 1 and no friction when the bounce combine is on maximum and bounciness drops quickly when bounce combine is on average. I just want an eternally bouncy ball, not one that bounces out of control. What do I need to do?

So, get component is an expensive call? Whenever i make projectiles i get a reference to other. GetComponent() and subtract the damage from other.Status.health and destroy my projectile, is there a better way to go about this? Sure for a bullet hell shooter it would be better to let the enemies check if they've been hit, but this approach seems awkward for games where the player only occasionally shoots an arrow.

is there a plugin for VS editor which shows inline parameter hints as Rider do?

how do I have a collider on an object that isnt a cube, sphere, cylinder, etc. (I'm using a chair) and I know I could just make the collider a cube for the chair, but how do I get an exact collider for the object?

Hi! Someone help me please! How can I determine the coordinates of the vertices of the Box Collider? If the object's rotation is not (0, 0, 0), then collider.bounds doesn't help.

Does this man ever smile

On my player, I have a character Controller, animator, and player script and on the obstacle, I have a box collider and the script. When my player tries to jump close to the obstacle and hit the box collider, the player files of the game in the y-direction. When the player jumps from afar from the obstacle then nothing abnormal happens. Do you know what can be the reason for this? I am using on triggerEnter.

Hey JAson - Great content - each and every time.. keep on doin what youre doing... but one odd request - Please *wear a shirt different colour from the chair* - I cant un-see your flying head !

huh, attaching a rigid body doesn't appear to provide any sort of gravity for me, no matter the type of object I create. You don't appear to have any script attached to your sphere. Maybe they updated this? Not that it's any problem to write gravity code, but I did spend some time trying to recreate exactly what you did and could not.

Bro.i want to create roulette wheel and ball.but when roulette object rotate ball go out.what to do?

I got a rigidbody here for ya har har har

if I want everything to fall faster, is increasing the gravity value the right thing to do? Seems very weird, but I find the default fall speed to be very slow for my game. (drag already set to 0)

:c i'm not getting a red line when i attach the debug to the Sphere

Hey. I am making top down shooter for mobile and i have problem with making projectiles. I tryed using rigidbody continuous dynamic collision detection but this didn't detect hits when bullet goes faster. Also tryed raycasting between last and current position for detecting collisions but this method is really performance heavy. So can you help me with dome ideas ? How can i make mobile friendly accurate bullets.? Thanks.

I find Unity very inconsistent and difficult to understand. If I create the ground as a plane which comes with a mesh collider attached. The ball falls straight through the floor. If I create the ground as a cube which comes with a box collider the ball will stop falling when it hits the cube. Why does the mesh collider not stop the ball falling? I have to manually add a box collider to the plane to get the ball to stop falling. I also swapped the ball for a tall rectangle. The rectangle fell straight down and then bounced perfectly straight back up. This looked totally unatural. In real life the tall rectangle would fall over. So I guess I have to use a script to make the bounce more random and natural

It's videos like these that makes me want to give up before I start! (As a newbie)I typed all the code as per the video and in the very first piece of code I get 2 errors! I don't understand them and cannot fix them. Below is my code and the error reported on the console. (Remember I am a beginner and this video is aimed at beginners....right? using System.Collections; using System.Collections.Generic; using UnityEngine; public class ChangeColorOnCollision : MonoBehaviour { private void OnCollisionEnter(Collision collision) { Color randomlySelectedColor = GetRandomColor(); GetComponent().material.color = randomlySelectedColor; } private void GetRandomColor() { return new Color( r: UnityEngine.Random.Range(0f, 1f), g: UnityEngine.Random.Range(0f, 1f), b: UnityEngine.Random.Range(0f, 1f)); } } ChangeColorOnCollision.cs(16,9): error CS0127: Since 'ChangeColorOnCollision.GetRandomColor()' returns void, a return keyword must not be followed by an object expression Will you tell me what is wrong please??

I struggle to make friction based movement, like in real life.

26:25

How do we define collisions and kinematic motion and physic-materials in Unity ECS? Or do we have to have a hybrid system where some of the game physics uses old MonoBehaviours?

I still remember trying to explain to someone why making the jump of a character physics based was better then 4 hours of coding it in., lol. why reinvent the wheel.

привет *привет* -привет- _привет_

drunken wizard.