⚛️┃physics

[dreamy whale]

the ragdoll itself is easy to make

my problem was the animations

[pulsar canopy]

I'm just using controller simple move for movement and controller jump for jumping? You need anything specific?

[timid dove]

The movement code

Just share the whole player movement script

[pulsar canopy]

I'm using Playmaker for programming. Perhaps unreadable to you

[timid dove]

Long story short, the movement is all due to your code. If you don't want to share the code there's little anyone can do to help

[pulsar canopy]

I can share the code, it's not a problem

but can you read playmaker FSMs?

[timid dove]

Why not

[pulsar canopy]

arlgith

one sec

@timid dove There

[pearl ivy]

Just toggle between is kinematic and no kinematic on each joint. When animating set all to kinematic, when not set to false, that’s what works for me

[dreamy whale]

nono, like, i did a ragdolls who respond to animation keeping the physical response to the ambient

[stuck bay]

I want to make a physics vr sandbox game, but dont know how to start, i dont know how to code. any tips?

[wide nebula]

If you don't know how to code, then you need to start your !learn

[flint portal]

:teacher: Unity Learn ↗

Over 750 hours of free live and on-demand learning content for all levels of experience!

[crystal shale]

Hello! My question is about Slopes. : In my race game (in space) i have a road with climbs and slopes. I also created invisible walls along the road to avoid players to fall. My players are using the CharacterController component to run and i set Slope Limit to 60 , but in this case with this limit, players can also climb a wall according the road angle. QUESTION : can i set a different Slope Limit in this component for different object / layers ? Thanks for any help

[civic void]

Hello there. I'm trying to make a game with slowmotion, but the character is not supposed to be affected by slowmo. But if I make timeScale = 0 everything, including character freezes. I feel like I'm beating my head to wall at this point.
I get that FixedUpdate works only if timeScale > 0, but switching to Update didn't help (even though the direction know contiones to be calculated)

Here's my movement code:

private void FlyManagement(float horizontal, float vertical)
{
    //Debug.Log("horizontal: " + horizontal);
    //Debug.Log("vertical: " + vertical);
    Vector3 direction = Rotating(horizontal, vertical);
    Debug.Log("direction: " + direction);
    rb.AddForce(direction * (flySpeed * 10 * (IsSprinting() ? sprintFactor : 1)), ForceMode.Acceleration);
    Debug.Log(direction * (flySpeed * 10 * (IsSprinting() ? sprintFactor : 1)));
    HandleSprint();
}

private Vector3 Rotating(float horizontal, float vertical)
{
    Vector3 forward = arrowCamera.TransformDirection(Vector3.forward);
    // Camera forward Y component is relevant when flying.
    forward = forward.normalized;

    Vector3 right = new Vector3(forward.z, 0, -forward.x);

    // Calculate target direction based on camera forward and direction key.
    Vector3 targetDirection = forward * vertical + right * horizontal;

    // Rotate the player to the correct fly position.
    if ((IsMoving() && targetDirection != Vector3.zero))
    {
        Quaternion targetRotation = Quaternion.LookRotation(targetDirection);

        Quaternion newRotation = Quaternion.Slerp(rb.rotation, targetRotation, turnSmoothing);

        rb.MoveRotation(newRotation);
        SetLastDirection(targetDirection);
    }

    // Return the current fly direction.
    return targetDirection;
}

 private void Update()
 {
     if (InputManager.playerInputActions.Arrow.enabled)
         FlyManagement(Input.GetAxisRaw("Yaw"), Input.GetAxisRaw("Pitch"));
 }

And here's my TimeController:

[SerializeField] Slider slider;
 [SerializeField] TextMeshProUGUI speedText;

 private float fixedTime = 0f;
 private float maxfixedTime = 0f;

 private void Start()
 {
     fixedTime = Time.fixedDeltaTime;
     maxfixedTime = Time.fixedDeltaTime;

     SetSlider();
 }

 private void Update()
 {
     ChangeTimeScale();
 }

 private void SetSlider()
 {
     slider.maxValue = 10f;
     slider.minValue = 0.0f;
     slider.value = 1f;
 }

 public void ChangeTimeScale()
 {
     speedText.text = slider.value.ToString("N2");

     Time.timeScale = slider.value;
     //Time.fixedDeltaTime = Mathf.Clamp(fixedTime * Time.timeScale, 0f, maxfixedTime);
     Time.fixedDeltaTime *= Time.timeScale;
 }```

[lean skiff]

https://forum.unity.com/threads/raycasts-randomly-stop-hitting-rigidbody-for-a-few-seconds-on-android.1527136/

Unity please

Fix this bug

Been working on it for the past like 6 hours

Definitely is a bug with Unity

Been using unity since 2015

[timid dove]

Never heard of such a thing but if you want it fixed you should put together an example scene where it can be reproduced and submit a bug report

[limber narwhal]

My bullets are going thru the target, because they are too fast anyone has a suggestion on how to fix it?

[lean skiff]

i have no idea how to reproduce it

it happens so randomly

[wispy hemlock]

https://docs.unity3d.com/Manual/class-TimeManager.html

[limber narwhal]

ty :)

[timid dove]

It's more likely a bug with your code than with raycast itself

[lean skiff]

i made a test and was able to reproduce it

[woeful pulsar]

Using the 2D physics engine, can I achieve the following behaviour?

I want a rigidbody that responds to joints constraints (so not kinematic), and who's own position is also constrained on an arbitrary finite line.

The problem is that rb2D.MovePosition is performed on step following the call, rather than the same.

So during the last step before rendering, diverse forces are applied to the object in question. I then make an attempt to force the position back to its finite line constraint, with rb.MovePosition, but that will not be applied until the next frame. So the frame is rendered with the rb exceeding its constraint.

Any idea how I can solve this?

[solid spoke]

hey!
i'm just wondering if i'm using the recorder in unity, does it effects physics? the answer i am getting online is no, but i am getting issues with physics on my end. any insight would be great (: thanks

[timid dove]

It doesn't but if your code is framerate dependent it might simply be affecting framerate

[solid spoke]

i'm using it in conjunction with mlagents, but the agents logic is framerate independent, nested in fixed update.

however, when training an agent it does suggest these two options

would there be anyway to figure out if some logic wasnt frame independent, and was causing this?

[lean skiff]

I FINALLY FIGURED IT OUT

after pulling 2 all nighters

and working for so many freaking hours

[stuck bay]

Hey all! Sorry if this doesn't belong here, I just wasn't sure where to put it. So I got a slight problem. When my cube collides with an edge, it goes slightly to the opposite direction of the collision and I just can't seem to fix it

anyone got any tips?

I tried a circle collider, I tried without the edge radius, I tried with default rb2d settings

and since the way the movement works, I need it to be as close as possible to the "walls" so I can do a raycast, and check which side of the square is 'touching' a wall

I could make the raycasts longer, but that just seems like a band-aid solution and there has to be a better one

[solid spoke]

i've narrowed it down to accumulation, the first video is accumulation enabled. the latter is it disbaled. the movement of the character is more stiff in the accumulated ver.

[timid dove]

Not sure what accumulation is

[solid spoke]

its for recording samples of a frame. similar to how blender renders images

you can use it with hdrp and path tracing, something funky must happen with the physics

found this forum post about it, but not much detail on how to fix it

well they do go into it, but.. i cant make heads or tails or it lol

https://forum.unity.com/threads/question-from-the-team-accumulation-motion-blur.1205428/

[pastel sparrow]

Hey everybody, I created a cave 3D in blender and imported it into Unity, I applied "generate colliders" and it works kinda but as soon as I enter the cave the floor is fall through for my character, does anyone know how I can make the floor and inside walls solid ?

[modern sedge]

make sure your normals are the correct way round

[steel sorrel]

how do I query the Physics engine to give me the FIRST element in a given internal voxel WITHOUT checkning all the other objects inside it? 🤔

that specific task I know how to do ... but if I implement it myself, I'd have to implement the resto of the physic system 😂 ... which is beyond me

[vague scroll]

Has anyone tried to perform parabolic motion to 2d objects in a top down view?

I'm doing the transformation I think that are correct, shearing z towards y but still it doesn't yield correct results when throwing at a tilted angle

[dapper arch]

Hi, I want to make a 2D Grappling System, which will let the player to grapple onto an object, and swing around it or pull themself to it. I want to make the swinging system for now. There are many 2D joints, and I'm looking for the one that will work like a rope, letting the player swing around the object. Which joint will work like that?

[rugged swan]

hi, I have an enemy which has a Collider2D and an animation that controlls its up an down movement, in the scene view it looks like the collider just moves with the object as it's supposed to but when playing the game it acts like the collider is everywhere on the trajectory. Does anyone know why that happens and how I could fix it?

[timid dove]

The closest will be a hinge joint. If you want an actual rope you'd make it up of many small segments connected by hinge joints

[dapper arch]

oh hi praetor, thanks for the answer. i was trying the spring joint and it's the best result i've got yet, but i will also try the hinge joint. thanks for help!

[gaunt notch]

Hey guys - pretty straight forward issue:

Collision detection not registering 100% of the time when projectile (and therefore collider) is < 2.5 size. (I'm using OnTriggerEnter)

Current fix is my projectiles are bigger than I'd like. They're just cubes with a box collider for now.

Potentially - Make 'game/environment' bigger so that projectiles look smaller?

Thanks.

Also - the projectile does NOT have a rigid body. Only the object that the projectile collides with has one. That objects rigid body has: Is Kinasthetic = true.
Collision detection modes did not help with detecting my small particles.

[unique cave]

First, dont use trigger functions for fast moving objects because it doenst care about the collision detection mode (use OnCollisionEnter etc. instead once the following steps are done). Second, the projectile should have rigidbody and should be moved via it (not the transform directly) and the collision detection mode should be picked correctly (continuous should work fine) if you want accurate and reliable collision detection. You could also use the Physics methods like linecast or spherecast to trace the projectiles path one step at a time so it leaves no gaps between frames, though i would heavily suggest using rigidbody for the projectile to avoid further complications

[gaunt notch]

Thanks @unique cave this is an awesome response.

I'd definitely like to move away from directly using transform movement for projectiles at some point. But super interesting to know about trigger and collision detection mode!

Okay I'll transition to OnCollisionEnter for sure.

It will eventually have to be networked so I'm not sure about those linecast and spherecast being possible, but rigidbodies definitely are possible with my networking solution.

Living legend mate thanks again!

[zinc dirge]

Hello everyone.. I have a doubt with photon fusion v1 unity.

I have a Gameobject (attached with Rigibody2D, NetworkRigidbody2D, NetworkObject components) which is in the scene.
My player will have to interact with this gameobject and say addforce to it.
initially the rigibody type is kinematic and on the runtime i am trying to set it to dynamic
this change in rb type is working for host but not for the client
I have also manually tried changing the rb type to dynamic on the client side on the runtime
but surprisingly it's getting changed to kinematic immediately and the addforce does not work
But if i change the rb type to dynamic on the host end it is changing

Am i missing something?

[cold rapids]

How can I make a Rigidbody bounce from hitting the wall?

[peak stirrup]

physics material has bounciness stat u can put to colliders

[oak topaz]

Hi I just want to say that my asset on the unity asset store is on sale now (https://assetstore.unity.com/packages/tools/physics/prpc-parkour-rigidbody-player-controller-229619)
and for people that do get it, you can join a giveaway on my dc server for an awesome AI system. (link for dc server on the asset store page)

[alpine delta]

I ran out of ideas

WHY?

[silver moss]

Can try to step up your solver iterations in the physics settings and see if that helps with stability

Ragdolls can take some tweaking to get it right

Enable preprocessing in the joint and Enable adaptive force in physics settings might have an effect too

[glacial swallow]

random shot in the dark question:

when using rigidbody interpolation and simply applying a force via setting velocity direction, if that object is sliding against a wall, interpolation seems to stop working. friction is 0 on the object. any idea what could be causing this behavior?

more info: outputting velocity via debug logs every FixedUpdate() returns the correct velocity. so i know the velocity is correct and friction is not being applied. why is interpolation wrong..?

[timid dove]

applying a force via setting velocity direction

This is a contradiction. Are you applying forces, or setting the velocity? Show your code perhaps (all of it)?

[glacial swallow]

its just setting a velocity every FixedUpdate

rigidbody.velocity = myDesiredMovement

[timid dove]

That will not generally break interpolation. Something else is going on.

[alpine delta]

Tried enabling preprocessing, increasing solver iterations even changing solver, changing tensor interia, changing interpolation, changing collision detection, chaning mass, nothing helps. One time is better and another is even worse. But ragdoll is still weirdly bouncing. Tried also with projection. Nothing helps. That's why I wrote "I ran out of Ideas..."

I even made IEnumerator which waits to all colliders, charactercontroller or animator components are disabled and then enable the ragdoll to be sure nothing is overlapping

[silver moss]

Are any of the rigidbodies children of each other?

[alpine delta]

yeah, that's mixamo rig

[silver moss]

Well they definitely should not be

Put them all under the same parent which does not have a rigidbody

[alpine delta]

it looks like this

red dots are rigidbodies

[silver moss]

Ok and it is wrong. Rigidbodies dont work correctly as children of other rb's.

[alpine delta]

I followed this tutorial and on the video is the same situation but she dosen't have same problem as me

so are you sure that is causing the jittering ?

what about joints?

[silver moss]

Make a script that changes their parent at runtime if you dont want to change it in the editor

[alpine delta]

I will check that in the moment

[alpine delta]

it can't be not parented, I think you are wrong

[silver moss]

Of course it can be not parented. The joint is what keeps the bodies together, not the parent-child relation

You are doing something else wrong

[alpine delta]

OK so tell me why EVERY player model have parented rigidbodies and it works for every other user

[silver moss]

Im telling the way I always did it, and everything on the internet says that rigidbodies dont work with parenting

Not sure how it's okay in the tutorial

You can also try adding a component on each bodypart and have that component Log what it collides with in OnCollisionEnter

To debug if theres some unwanted colliders/collisions

[alpine delta]

so how to assign then this ragdoll to animator? It is not possible.

[silver moss]

You wont be animating the bones directly with an animator

If you want some sort of 'active ragdoll' then the usual way is to use two rigs

[alpine delta]

I need to respawn my player so it must be animated again, while I unparent all rigidbodies it is messed up

and I can't spawn player model again

[silver moss]

Where one is a normally animated rig with normal hierarchy and the other one is the ragdoll that tries to replicate the animated rig's rotations

[alpine delta]

what do you mean by active ragdoll?

[alpine delta]

anyway, while unparented this is still happening

[silver moss]

Did you do this

You are disabling all other colliders on the player, right?

[alpine delta]

yes as I said I even made Enumrator which waits to disable all unecessary colliders

[alpine delta]

I checked, it collides only with each other

problem is gone by tweaking tensorinteria values but I can't still get rid of this werid behaviour when it becomes ragdoll, why the hands are flying up. When I turn to ragdoll on other animation it behaves normally

(timescale 0.01 at start)

[silver moss]

Might be the joint limits in the arms causing them to rise up

[alpine delta]

yes I checked it right now

[odd escarp]

hello
how can i use mesh colliders in terrain details ?
i get the boring message "TerrainCollider: MeshCollider is not supported on terrain at the moment." which, according to forums, is a feature that Unity deny to implement since 2011...
is theres a workaround about that ?

[north linden]

@alpine delta those soft shadows, are those the experimental hdrp capsule shadows or just pcss? i want it

what exactly is your problem? parenting rigid bodies is ok

[alpine delta]

raytraced shadows

[gleaming gorge]

2023 is almost end and mesh collider for terrain details are still not supported? That limitation is like more than 10 years old 😅
well, you can just make them prefab and create a prefab 'painter' to paint them on terrain using editor script, someone has created one iirc, it's on unity wiki or something

[glad musk]

is it possible to create a custom mesh collider? becasue right now when i use the normal mesh collider with convex on my car body and the wheel colliders interact and my car body flys away

[odd escarp]

i see, but i want to take advantage of the automatic GPU instancing used to display theses details :/

[timid dove]

Multiple colliders under the same Rigidbody will never interact with each other

make sure your parent car object has a Rigidbody and there aren't any other Rigidbodies in the car hierarchy

[glad musk]

the main parent?

shoulkd have the rigidbokdy

[timid dove]

yes

[drowsy drift]

Anyone know of a good alternative to RCC for a car controller?

[wraith junco]

You can write your own custom wheel colliders with relative ease

if that's what you're asking.

[hallow igloo]

I want it to rotate like steering wheel but it isn't happening

[glad musk]

Can anyone help me with my suspensions? i dont understand why my car kind of flys half in the air even without the suspensions raycast touching the floor

https://gdl.space/hagapecodo.cs

[topaz acorn]

some website to simulate vectors and its additions/subtractions and others?

[bleak umbra]

https://www.desmos.com/calculator/u8wt5rnw9n

[mossy bone]

I think geogebra

[topaz acorn]

thanks

[carmine basin]

I'm getting some very odd physics material stuff happening

Both my player and the ground have their own material, with the bounciness set to 0 and the bounce combine set to multiply (just to be doubly ultra sure they don't bounce)

NOW
as soon as I spawn in a grenade, which does bounce

Everything bounces

w h y

I'm not touching physical materials in code ANYWHERE

and I've now set the bounciess on grenades to zero, but the player still bounces

grenades fired --- do I bounce?
0                  no
2                  no
4                  no
6                  no
8                  yes??

[timid dove]

Set it to minimum

[carmine basin]

It already was

I found out that the very existence of a third physic material, when there were 8 or more objects with that physic material, caused all other rigidbodies to be bouncy

[potent nova]

im making a slingshot game which has different weapons and I am just wondering what calculation will have to be made to show the varying acceleration dependant on the length that the slingshot is stretched to?

the less it's stretched the less it will accelerate, and the more it's stretched the more it accelerates. Also the bullet needs to act under gravity to create an arch motion

Thanks 🙏

[solemn hedge]

Hi!

I'm trying to get object-holding physics working in a VR game I'm currently developing, but I have some trouble.

I'm using a ConfigurableJoint that holds the object in the target location (where the hand is). Initially this created some problems with unsolvable constraints, such as moving the object into a wall. With high force settings, it causes absolutely horrible jittering, but with low force settings the object doesn't follow the movement of the hand adequately.

That was solved by setting a low default force, but compensating by setting TargetVelocity to the hand movement delta each physics frame - so basically applying the hand-movement as TargetVelocity. Then, when the hand is in a wall, there won't be a huge force acting upon the object and causing jittering.

However, this means that the anchor point for the joint must be very much in line with the transform for the hand, or applying the hand rotation will cause a large amount of drift (which will be slowly compensated for by the low default force - but it doesn't feel good).

Now, the object moves smoothly and doesn't react badly to collisions. But in the case of a gun, I want to apply recoil. Since the rotation axes of the joint must necessarily be in the center of the gun / center of the hand, direct application of rotation via TargetVelocity doesn't work - the gun tilts upwards, sure, but it doesn't look natural since recoil (if rotational) must be applied around the wrist.

I've tried simulating this by applying a small rotation around the x axis and simultaneously moving the gun backwards and upwards, but it's hard to get it to look good.

We need to use physics because recoil is part of the mechanics, not only visually. Check the video below for the previous physics implementation (that we can't use since it had other limitations). https://www.youtube.com/watch?v=Ih76pkc0W_4

Anyone have any suggestions on other methods to try or maybe a solution to this problem?

[old acorn]

I have a weird bug, so my flashlight falls through the terrain at a certain height, or more specifically at a specific speed its falling, any other 3d objects with rigid bodies are fine though,

what could be causing this?

[timid dove]

Turn on continuous collision detection

Also if it's very small and very fast it may tunnel anyway

[old acorn]

Yeah this might have been the issue actually, thank you so much

[carmine basin]

I wish I coud help with the issue you're having but I wanna say this looks so fucking cool

[solemn hedge]

Thanks! Physics is a pain in VR though

[carmine basin]

I'm sure it is, it looks like you're handling this really well

Keep it up <3

[umbral aspen]

Anyone have working car physics property values for Wheel Colliders?

[bleak umbra]

The values in the example code in the docs work

[heady adder]

Hey there, I have a question about raycasting:
So let's say I have this circle character which shoots a red raycast downwards which detects the blue layer. This will return a RaycastHit.distance of 0 as it hits it immediately at it origin point. But is it possible to ignore that and find the distance from the origin of the ray to the edge of the blue box or not, without having to add something else?

[timid dove]

the picture is unclear. Where are the colliders here and what kind of colliders are they? Is this 2D or 3D?

[heady adder]

The blue box is a box collider and it's 2D

[timid dove]

You would need to either use an edge collider instead, or fire a raycast from the outside pointing towards the player

[heady adder]

Hmm okay thanks!

[gray goblet]

I have a problem with my AI movement system. I recently rewrote my movement system to physics based, because when I moved the characters with transform they bugged across obstacles. I solved this issue with physics but when I have a lot of characters instantiated the game instead of lagging, gives higher speed to all characters moving with physics. Does anyone knows how to fix this?

//Update
private void Update()
{
    //Get All Enemies
    List<GameObject> enemies = new List<GameObject>();
    enemies.Clear();
    Component[] humanoids = Humanoids.GetComponentsInChildren<Component>();

    foreach(Component hum in humanoids)
    {
        if (hum.gameObject.CompareTag("Enemy"))
        {
            enemies.Add(hum.gameObject);
        }
    }

    //Get The Closest Enemy
    if (enemies.Count != 0)
    {
        Target = enemies.OrderBy(enemy => Vector3.Distance(transform.position, enemy.transform.position)).FirstOrDefault();
        Vector3 TargetDirection = (Target.transform.position - transform.position).normalized;

        //NewPosition
        Vector3 newPosition = lastPosition;

        //Move Towards Target (Physics)
        newPosition = TargetDirection * Speed * Time.deltaTime * 100f;

        if (Vector3.Distance(transform.position, Target.transform.position) > 1f && Vector3.Distance(transform.position, Target.transform.position) < 30f)
        {
            rb.velocity = new Vector3(newPosition.x, rb.velocity.y, newPosition.z);
        }
        else if (Vector3.Distance(transform.position, Target.transform.position) >= 30f)
        {   
            animator.SetBool("IsMoving", false);
            return;
        }

        //............

        //LastPosition
        lastPosition = newPosition;
    }
    else
    {   
        animator.SetBool("IsMoving", false);
    }
}

[tulip goblet]

equipable.rigidbody.isKinematic = true;
```Hey I've got this error when trying to do this line of code `[Physics.PhysX] RigidBody::setRigidBodyFlag: kinematic bodies with CCD enabled are not supported! CCD will be ignored.` What does CCD mean?

[graceful hazel]

Can someone tell me why the wheel collider is so big and in the wrong rotation ?

@tulip goblet equipable.rigidbody.collisionDetectionMode = CollisionDetectionMode.Discrete;
equipable.rigidbody.isKinematic = true;

CCD stands for Continuous Collision Detection.

It is a feature in physics engines that helps detect collisions between fast-moving objects more accurately.

if u dont need CCD u can disable it

[tulip goblet]

Thanks, I've been caching interpolation state before equipping an item (setting it kinematic) but not collision detection mode. In older versions of Unity (like 2-3 months ago) this error didn't appear, today I've upgraded and it started being an issue. Thank you!

[tulip goblet]

I guess you've tried lowering its radius? And rotating BR game object?

[warm sky]

How would you guys render a person real-time?

To make it as realistic as possible?

Imagine rendering a person so I can touch their head and interact with it

[timid dove]

Isn't that pretty much the culmination of what a game engine is? Rendering things in real time?

If you want realism use HDRP. Here's some demo stuff:
https://github.com/Unity-Technologies/com.unity.demoteam.digital-human

[warm sky]

Thank you very much, I'm total newbie in unity so that's why I asked it in wrong way

[devout token]

Rendering and physics are not really related to each other
If you have more specific questions about rendering it's best to ask in one of the rendering related channels

[grave spindle]

i have a "rope" composed of 5 cylinders (here selected)
when i attach a rigibody at the end (like a player), since the player mass is higher than the rope, the rope "strechs" down
all the cylinders have a rigidbody and is connected with mutliple hinge joint (5 in total)

the issue is that there are some "gaps" appearing between the connected rigidbodies

is there a fix ? maybe allowing the rigidbodies to overlap each other so it can have any angle without reacting ?

[agile bridge]

Why are you using meshes like this for your rope anyway

Use a line renderer or something

Maybe a rigged rope mesh

[grave spindle]

is a line rendered not only for particules ?

[agile bridge]

No?

[cedar sleet]

Hello, I've got some flak shells that I'm trying to make explode when within a sphere proximity of the player. Right now I'm using an oversized sphere collider set to IsTrigger, and that is working, but only when the sphere collides on its very front tip. No matter how large I make the diameter, the sphere will not trigger if its path is above or below the target. I tried using a box collider isntead hoping the sharp edges could help somehow, but no difference. Any ideas?

[weak ingot]

Hello, please advise me on physics for an Android machine or can you give me some advice on how best to write it?

[timid dove]

You don't need to write physics. Unity has a built in physics engine.

[devout token]

Triggers use the lowest accuracy discreet collision detection, meaning it's likely to miss when moving fast
A better option would be to do OverlapSphere or SphereCast checks forward along the projectile's extrapolated position

Another option is potentially to use a rigidbody sphere collider with continuous collision detection, and ContactModifyEvent / ContactModifyEventCCD to get the collision information while ignoring physics forces from it

[cedar sleet]

Hmm interesting. I already have one rigidbody on the bullet (already set to continuous dynamic) and a smaller collider, with OnCollisionEnter logic in the script. This is to handle direct hits. Would I be able to leave that alone and do a second OnCollisionEnter that specifies a different collider?

[agile bridge]

Why would you do all of this... just check if the distance between the gameobject and the player transform is less the x, then run the explode function or whatever you've got going on

[cedar sleet]

To do that I'd need a function for grabbing a reference to a flying unit within a radius yeah? Where would I start with that?

[agile bridge]

Is your player script a singleton?

[cedar sleet]

The flak targets ai vehicles as well

[agile bridge]

Does the flak have a refrance to whatever it is targetting?

Like Any kind of reference?

Pass a refrance to the flak to whatever its target is, then on fixed update check if it is in the distance between the flak and its target is lees then any value you want

[cedar sleet]

The vehicle itself picks and rotates towards a target somewhere buried in asset store code I didn't write. I could have the shell itself find objects by type and use that reference though probably

[agile bridge]

Okay, so in the code that spawns the flak, go to where the flak is instantiated, get the flak component on the flak prefab that youve just spawn, and since you already know what the target is, pass the target to the flak component

[cedar sleet]

I now have a OverlapSphere working on the shell itself. It correctly explodes when within a certain radius. However it only does this for the first shot, after that it stops working. I think it may have something to do with how my timer to arm the proximity detection works, or else have something to do with the fact that I use a pool to spawn the bullets.

public float damageDealt;
public GameObject impactUnit;
public GameObject FlakBlast;

//public SphereCollider flakproximity;

public float flakProxArm;

private float timer;
public float timeRange1;
public float timeRange2;

public float flakRadius;
[SerializeField] private bool IsFlak;
private bool Armed;



private void Start()
{
    Armed = false;
    StartCoroutine("FlakTimer");
    timer = Random.Range(timeRange1, timeRange2);
}

IEnumerator FlakTimer()
{

    if (IsFlak == true)
    {
        

        yield return new WaitForSeconds(flakProxArm);

        Armed = true;
    }
    
    
}

private void CheckForTargets()
{
    if (Armed == true)
    {
        Collider[] colliders = Physics.OverlapSphere(transform.position, flakRadius);
        foreach (Collider c in colliders)
        {

            UnitHealth healthchild = c.gameObject.GetComponentInChildren<UnitHealth>();
            UnitHealth healthparent = c.gameObject.GetComponentInParent<UnitHealth>();

            timer -= Time.deltaTime;

            if (timer <= 0)
            {
                if (healthchild != null && FlakBlast != null)
                {
                    healthchild.AIDamaged(damageDealt);
                    GameObject go1 = Instantiate(FlakBlast, this.transform.position, this.transform.rotation);
                    go1.transform.parent = null;
                    Destroy(this.gameObject);
                }

                if (healthparent != null && FlakBlast != null)
                {
                    healthparent.AIDamaged(damageDealt);
                    GameObject go1 = Instantiate(FlakBlast, this.transform.position, this.transform.rotation);
                    go1.transform.parent = null;
                    Destroy(this.gameObject);
                }
            }
        }
private void FixedUpdate()
{
    if (Armed == true)
    {
        CheckForTargets();
    }
    

}

[cedar sleet]

Ah, so part of it was something dumb. I was calling damage to the health script twice because the flakblast prefab also does damage. So the flak was destroying my health script, then after that the proximity logic wasnt triggering because its gated behind getting the health script component on its target. So now shells reliably explode when within a radius of a unit. Only thing left is to get the timer working so that shells dont explode at the same spot always in front of the unit, sometimes they will explode next to or behind it based on a timer to simulate how real flak explodes at varied points around a plane

[molten topaz]

Suppose the camera frustum is nearby pointing at a rock which has a mesh collider with it , will the cpu calculate physics for it?

[timid dove]

Physics has absolutely nothing to do with the camera

[tough brook]

Hi everyone, I'm making a sport game and my ball is in one place at the start of the game. This happened randomly during development and for some reason it works when i click on it and set excluding layers on the rigidbody to everything, however it simply falls through the floor of my court. How can i fix this?

[timid dove]

Does the floor have a collider?

[tough brook]

nvm i fixed problem

[balmy thicket]

anyone know why ading a rigidbody component to an enemy is making my bullet not detect a collision/

[timid dove]

You need colliders for collision detection

show the inspectors of the two objects you expect to collide

[balmy thicket]

it fixed when iturned the collision mode on the rigid body to dynamic speculative

thank you though

[lilac wedge]

I use 2D physics. I have two objects, a box and a player. Box is a child of the player (so they move together).
The problem is that when a box moves inside a trigger, the Player object (box's parent) also receives a OnTriggerEnter2D callback. I would like to have separate callbacks for when the Player moves inside a trigger and when the box moves inside a trigger (even though they have child-parent relation)
Is there a way to achieve that?

[timid dove]

You would need to give the child its own (kinematic) Rigidbody2D

Rigidbody2D is basically the boundary at which those callbacks are delineated.

[lilac wedge]

ahh, it's yet another "you just have to know" automagical Unity thing, thank you!
It does solve this particular issue but adding rigidbody2D to the box creates some additional weird physics glitches

[timid dove]

another option is to put the main player collider on a separate child object and detect those trigger interactions on a script on that separate child

e.g.

parent object (Rigidbody2D)
  main collider (script A)
  secondary collider (script B)```

[lilac wedge]

or maybe it's going to be fine with two rigidbodies, we'll see!

[lilac wedge]

interesting idea, I'll investigate

[mint turret]

Hi guys so sorry if i am at the wrong place is there a way to configure the cloth component i have on a sphere to make it act more like a dough? right now i am able to interact with the sphere and get like a flimsy sphere that wobbles .

[raw skiff]

From the magical world of dumb questions, how can I prevent two layers from colliding with each other in 2D? I've unticked the interaction in the Project Settings > Physics > Layer Collision Matrix, but my character is still able to stand on top of platforms that should now be non-colliding... (Player / OneWayPlatforms)

[timid dove]

Settings look correct, show the inspectors of the two objects?

[raw skiff]

Wilco.

My theory right now is that it's the Platform Effector 2D on the Tilemap that's causing the problem, but any other ideas would be welcome.

If I set the Collider Mask to 'nothing' or I deselect 'player' I get fairly close-to-expected behavior.

[heady adder]

Hey there, I had a question about the normal of a surface in 2D. I attached an image to explain it better. The black lines are the surfaces. My question is, will the normal of a surface always face up (like the blue lines) or can it also face downwards (like the red lines)?

[timid dove]

It depends what kind of surface we're talking about

Most colliders have an inside and an outside

The normal will face outside

For an edge collider it depends on which direction you're coming from

[heady adder]

Oh it's a box collider for me

[timid dove]

Then you will only ever have a normal in the context of a Raycast or collision coming from outside the surface and that normal will always face outside

Up or down doesn't matter

[heady adder]

Thanks

[dim fulcrum]

I had/have a sliding mechanic implemented and recently realized it's broken, I'm almost sure it has something to do with my object scale. my level is built out of scaled prefabs, before I try random things to fix it, can anyone point me to some explanation of what the problem of scale and unity physics is?

[timid dove]

unity physics (actually PhysX) is designed to work best at "everyday" scales. E.g. between 1cm and 10 meters kind of thing

all the things like contact offsets etc are tuned for that

[dim fulcrum]

I'm going to open my prefabs in blender and scale them in there so they're scale = 1 back in unity. But the annoying part is this used to work, and I'm not sure what changed (maybe I tweaked some charactercontroller settings, maybe it's just that I added more objects to the scene?

[timid dove]

Well what makes you think your issue is scale related?

It's unclear what issue you're even having

[dim fulcrum]

I'm using "mountain" prefabs as my level, I just rotated and scaled a couple of them together and they form my "island". I have some code to make my character slide down slopes depending on the normal of the surface below them, this works on test cubes, and used to work on my level geometry but I just realized that my character no longer slides down slopes.

What makes me think it's scale? I asked chat gpt it gave me a couple options most looked unaplicable but it mentioned scale might be an issue. I changed one of my prefabs scale from (0.5, 1.5, 0.5) to (0.5, 1.25, 0.5) and my character started sliding.

(my island is a prefab that's scaled 5x on all axis and it consists of other prefabs that are each scaled varying amounts on y and xz)

[timid dove]

the scale in the inspector of the objects themselves isn't so much a problem as the actual world size of the objects

[dim fulcrum]

hmm... I think I need to do more debugging, because I can run around my terrain fine it's only the sliding mechanic that's failing so maybe this is a red herring, I mean maybe related to scale.

[dim fulcrum]

🤦‍♂️ yeah it wasn't the scale I fooled myself. Added new terrain layers to implement determining footstep sounds, but didn't add them to ground layers in my character controller...

[bold lava]

I'm trying to make a "van" object where I can place boxes into. The walls and ceiling of the van need to have large box colliders so that if the box is placed into the wall, the shortest path to get out is back into the van. However, sometimes the box gets caught in the seams between 2 box colliders. How would I make it so that all the box colliders merge into one collider?

front view & side view

[timid dove]

sometimes the box gets caught in the seams between 2 box colliders
There shouldn't really be any seams. How are you moving the box?

if the box is placed into the wall,
What exactly do you mean by this

if you're teleporting objects inside colliders, weird stuff is going to happen

make sure you move your objects in physics friendly ways in the first place

[celest meadow]

has anyone here used unity cloth component?

I'm having an issue where the edges of my cape get twisted around each other

[bold lava]

I have an empty socket on my player which the box transform sticks to

When I release the box, I make it kinematic and unparent it from the socket

[timid dove]

sounds like by the time you release it, it's already inside the colliders, which means you weren't moving it in a physics friendly way in the first place

Also once it's kinematic it's not going to move btw

[bold lava]

I set kinematic to false mb

[timid dove]

the fact that it's kinematic to start with then is why you're able to put it inside the walls in the first place

[eternal fulcrum]

how to shorten the stretching distance when using the "Configurable Joint"?

[lilac wedge]

I'm thoroughly confused by a very basic thing in my 2D game. I have a mechanic where I sometimes teleport objects to the exact position where they entered a trigger collider. Importantly, when they get teleported to that position, they don't exit that trigger collider (they don't call the OnTriggerExit2D message), they stay in it.

But I discovered that one of the objects (called Platform) DOES trigger that message when it gets teleported back. The code is exactly the same, but somehow this one object triggers the OnTriggerExit2D message when teleporting when no other object does, and it's a big issue.
Does anyone have any idea where does the difference come from?

On the screenshot I printed that the enter trigger area gives the same position that exit trigger area does. If it's the same position, why does it call the OnTriggerExit2D?

[timid dove]

what exactly are you printing the position of?

[lilac wedge]

position of an object, first inside the OnTriggerEnter2D, then immediately after teleporting to the same position, inside OnTriggerExit2D.
If I do the same experiment with different objects, OnTriggerExit2D doesn't get called (because technically an object should still be inside the trigger collider)

[timid dove]

i'm confused, where is the teleportation happening? What other motion is happening?

Maybe some pictures/screenshots would help?

[west thicket]

Could someone please help me with why my objects that have a Rigidbody glitch? I made this small demo video of the problem:

[cold socket]

Try swapping the mesh collider on the chair for a box collider and see if the same thing happens.

[viral field]

As a test, i am dropping a cube on its corner. changing the Mass in RigidBody does not affect the bounce, or to rest speed as it suggests it should. so far, not finding relevant information

Drag affects it, but not mass

THe Physics Material i added does allow me to change things like Bounciness and Drag also, but still, changing mass has no correlated effect

All physics settings has limited affect.

[timid dove]

Why would mass affect it?

[viral field]

because i did not make a vaccuum?

🙂

[timid dove]

Unity is a vacuum

There is no air resistance unless you program it

[viral field]

Seems that Mass should at least affect Bounce, or stagnation of movement

[timid dove]

Why

[viral field]

Why not?

^ that is what i am trying to get to

[timid dove]

There's no reason it would. All objects fall at the same rate, regardless of mass

[viral field]

in a vacuum yes, but regardless, i would think a 5 pound weight hitting the lawn would react/bounce/stagnate slightly differently than the lid from a can doing the same

[timid dove]

Unity is a vacuum

Objects are not lawns in Unity, they are perfectly rigid bodies

Hence the name Rigidbody

[viral field]

i have loaded in the Unity Physics package, but i have not attempted to 'Use' it yet. also considering Havoc, but that probably costs a fortune. have not looked at pricing/contract yet

[timid dove]

I don't think you will find any different results in any of them

[viral field]

so it is all down to the physics material then?

cause that certainly affects the Bounce, and other things

[timid dove]

Yes

[viral field]

Ok, thanks. i will approach it from that angle

[viral field]

That saved me a load of time. much appreciated

[viral field]

In case it is in need of correction, this is what got me on the path to trying different Mass settings
https://learn.unity.com/tutorial/add-components-to-3d-gameobjects

[west thicket]

Same thing happens

[split solar]

If I have a Unity layer with a bunch of concave mesh colliders on it that are only used for raycasts/other queries, and don't allow that layer to collide with other layers, will this impact performance or will it be negligible?

[timid dove]

The only way to know really is to try it and see. There's way too many variables at play.

[autumn igloo]

Hi there, I'm trying to build a simple 2d box stacking game. In my test, the boxes autospawn and just fall from the top at 0, y, 0. After stacking 10 or so boxes, the tower falls over because the boxes are somehow bouncy. Even when I attach a noBounce material to the ground and the box-prefab it happens. I also played around with mass, friction, interpolation but nothing seems to be working, is this some hidden Unity thing? Any pointers?

[split solar]

Okay well let's say that it ends up being fine.

What happens if I make these colljders follow other game objects in the scene?

Like as the object moves and rotates so does the collider

[timid dove]

Just the nature of the physics simulation. There's inherent instability

[gray goblet]

I have a problem with my physics movement system. My characters are very slow without multipling the movement by 100, and I dont know why. The current system is working in the editor and even in development build, but in build the characters are much slower and jittering. I think it is because the movement system. Does anyone know why the physics not works correctly in the build? Here is the code snippet for the movement>

//Get The Closest Enemy
if (enemies.Count != 0)
{
    Target = GameSystem.GetClosestEnemy(gameObject, enemies);
    Vector3 direction = (Target.transform.position - transform.position).normalized;

    //NewPosition
    Vector3 newPosition = lastPosition;

    //Move Towards Target (Physics)
    newPosition = direction * Speed * Time.deltaTime * 100f;

    if (Vector3.Distance(transform.position, Target.transform.position) > 1f && Vector3.Distance(transform.position, Target.transform.position) < 30f)
    {
        randomMovement = false;
        rb.velocity = new Vector3(newPosition.x, rb.velocity.y, newPosition.z);
    }
    else if (Vector3.Distance(transform.position, Target.transform.position) >= 30f)
    {
        randomMovement = true;
        animator.SetBool("IsMoving", false);
        return;
    }

[timid dove]

you are not supposed to multiply deltaTime into your velocity

remove deltaTime and the 100

also newPosition is a really bad name for that variable since it's not a position at all. It's representing a velocity.

[gray goblet]

Thanks, I think i solved my issue. I didnt use fixedupdate, I removed the the 100 multiplication and I`m multiplying the directions with the speed:

rb.velocity = new Vector3(direction.x * Speed, rb.velocity.y, direction.z * Speed);

May this fix the issue in the build , too

[broken stratus]

Hello, I'm currently in 11th grade and want to work in game development in the future, thing is, I didn't take physics as one of my high school subjects. Are there physics courses online that can help me learn about physics relating to game development?

[inner thistle]

Sure, but I don't think it would be very useful to you unless the goal is to later work in making physics engines

[broken stratus]

I thought physics was a necessity for game development and unis??

[inner thistle]

Most gamedevs working in the industry never have to do anything physics-related. Of those who do, most of them only use the methods defined in the engine they're using. It's certainly not a requirement to get into a university

[broken stratus]

oh, that's really nice to know, thanks!

[timid dove]

I think learning newtonian physics is actually a really good idea and quite necessary for game dev

a lot of people get confused about how the physics engine works and it's ultimately due to not understanding how real life physics works

that being said I have no idea where you'd learn it

[broken stratus]

alright thanks

[lucid hollow]

Hey guys 🙂 I currently have an issue which i don't know how to fix. Maybe someone of you can help me out? 🙂

Quick overview of the Situation:
I have a ball object which gets launched into a direction. I want to show a trajectory line as a preview so the player can aim accurately.
For this i copy my ball object, apply some force and then iterate though a number of points i want to display with my linerenderer. physicsScene.Simulate(Time.fixedDeltaTime).

ghostBall.ApplyKnockback(direction,  force);

for(int i = 0; i < MAX_ITERATIONS; i++)
{
    physicsScene.Simulate(Time.fixedDeltaTime);
    lineRenderer.SetPosition(i, ghostBall.transform.position);
}```

for simplicity lets pretend i do this in update();

also when the ball gets launched i start a coroutine which slowly increases the balls gravity up to a certain point.

```float elapsedTime = 0f;
float lastStep = 0f;
    
while (elapsedTime < increaseDuration)
{
    float step = Mathf.Lerp(0f, gravityIncrease, elapsedTime / increaseDuration);
                
    rigidbody.gravityScale += Mathf.Sign(rigidbody.gravityScale) * (step - lastStep);
                
    lastStep = step;
    elapsedTime += Time.fixedDeltaTime;
    yield return new WaitForFixedUpdate();
}

rigidbody.gravityScale += Mathf.Sign(rigidbody.gravityScale) * gravityIncrease - lastStep;```

My problem is that the simulation and the result when actually launching the ball is different and i don't understand why. Do you have any ideas?

[timid dove]

Well seems obvious - you're not doing the gravity increase thing for your simulation, but you are in the actual game.

it's also unclear how you set up the simulation scene for the trajectory calculation and copied the bodies over etc.

[lucid hollow]

the gravity increase coroutine is applied on the ghostBall when the force is applied.

Creating the scene works like this:

{
    if (SceneManager.GetSceneByName(SIMULATION_SCENE_NAME).IsValid()) return;

    Physics.simulationMode = SimulationMode.FixedUpdate;

    SimulationScene = SceneManager.CreateScene(SIMULATION_SCENE_NAME,  new CreateSceneParameters(LocalPhysicsMode.Physics2D));
    CopySceneAsSimulationScene(ballGame);
}```

for each object i need to copy i use this:
```private GameObject CloneObjectToScene(Transform trans)
{
    GameObject simulationObject = Instantiate(trans.gameObject, trans.position, trans.rotation);
    simulationObject.GetComponentsInChildren<Renderer>().ToList().ForEach(rendererComponent => rendererComponent.enabled = false);
    SceneManager.MoveGameObjectToScene(simulationObject, SimulationScene);
    return simulationObject;
}```

[lucid hollow]

I did some more testing, the Coroutine which increases the gravity is called on the ghostBall, but it doesnt take its steps into consideration. So basically nothing changes while simulating

[timid dove]

The coroutine isn't relevant because it's not going to be running during your while loop you shared above

[lucid hollow]

is there a way to take a coroutine into consideration or do i have to find another way?

[timid dove]

you need to do things like:

while (...) {
  physicsScene.gravity = whatever:
  physicsScene.Simulate(Time.fixeDeltaTime);
}```

make the changes as you simulate

i don't see how a coroutine is relevant or useful here

coroutines are for running things over multiple frames

your goal is to do this whole simulation in a single frame so you can draw it immediately

You will want to modularize your "each frame" stuff into a function such that it can be reused for both the trajectory simulation and the real physics sim

Basically I'd make it a function that takes a PhysicsScene as a parameter and does what it needs to do for a particular frame and reuse that in both places (the coroutine and the trajectory sim loop)

[lucid hollow]

Yea i think thats the best solution. Ill try it out 😉 thank you for taking the time. If i succeed i will provide some info on how i did it

[gaunt glade]

Hey do anyone know how to fix this green plus on my mesh collider

[timid dove]

What do you mean by "green plus"?

[timid dove]

that's because it's a prefab override

It means you added that component to this instance of your prefab in the scene, but the prefab itself (which is in the project folder) does not have that component

You can either Apply the override to the prefab, or revert it to get rid of that

[gaunt glade]

I tried to apply the override but it won't work and how do I revert it

Nvm both won't work

[timid dove]

wdym by "won't work"? What did you do and what happened? How did you try to apply it?

[timid dove]

If everything is greyed out it sounds like the prefab you're trying to modify is an imported mesh from a file. If that's the case you need to be creating your own prefab by unpacking the imported one and then you can modify it freely.

[balmy thicket]

anyone know how to fix this weird collision bug im having with navmesh AI? Im walking into the ai and i just teleport on top of them. Im using a character controller if that helps

[modern sedge]

you could have a high step height or the agents colliders are small (so you can walk over them)

[fossil pilot]

Hey if I have a question about the cloth component can i ask it here ?

[wispy hemlock]

Not sure if I'm in the correct place or not, but would anyone have any idea on how to do 'springy' landing gear for a spaceship? (as in, land, little bounciness and then settle?)

[native kraken]

Hello everyone, we have a building game and I have a problem with creating realistic aerodynamics. I'm struggling a lot with creating realistic lift. My lift force is applied in the direction of airfoil normal. I'm using formula Lift force = 0.5 * air density * velocity ^ 2 * airfoil surface area * lift coefficient at attack angle. Air density is 1.225 and lift coefficient can be seen on the graph below. I'm applying calculated force using ForceMode.Force. However this setup does not give me enough lift to takeoff and turn unless I scale this force in a factor of 10. When I do this, my plane starts acting mostly realistic. I've checked units, surface area, attack angles and mass. So the problem is that I do want to use realistic coefficients without scaling them by mystical factor of 10.

[native kraken]

I've figured it out. Lift coefficients depends heavily on shape of the wing and in my case are not 1.0 max.

[fair iron]

if you want i can send you mine

[native kraken]

Thank you but i dont need it, just had to make more realistic plane with cambered wings simulation

as well as increase lift factor by 1.5

[fair iron]

yes, i have that

[fair iron]

here is what i use for realistic wings

[native kraken]

Oh thank you!

[fair iron]

and here are wing curves i took from ethernet

[fair iron]

looks something like this

to use it, just dump it onto a object, set the wing scale, and it should work

make sure Z is up

no wait, Y is up, sorry, Z and X are allowed movements

[wraith swan]

i have this raycast point value thats supposed to move the character's y position to that value but its not moving... i've been at this for hours and hours and it i cant seem to find the solution... im using rigibody Kinematic and moving it under fixedupdate also the raycast is under fixed update did i set this up wrong or something else im doing wrong entirely

[timid dove]

we;l; first off, having your console in "Collapse" mode isn't helping things

second, without seeing the code or understanding how and where you're trying to move to, it's very hard to help

raycasts don't move anything in and of themselves

[wraith swan]

I use rigidbody.MovePosition, and collapse so i can differentiate the objects that raycast hits.. the one highlighted has the elevation of 1 unit but my rigidbody object just passes thru it

[timid dove]

show the code

also if the object you're raycasting to has an elevation of 1 I wouldn't expect this body to end with an elevation of 1

since it has thickness, both objects have thickness

[wraith swan]

I think im gonna have to solve this on my own... I know raycast hit returns a point and all i need is y position which is the value showing on the debug console

[timid dove]

If you don't want to share your code, yes you will have to solve it on your own.

[inner breach]

Hey all. I have a non-regidbody character controller that I haven't done myself. I have a problem that often it doesn't register when my character drops off a ledge and never detects landing either, meaning my fall damage and other effects doesn't initiate. Anyone has an idea about this. I've heard of this issue before, but haven't found a solution.

[timid dove]

without seeing code who knows

presumably your grounded check is not working

[inner breach]

I should've added that I'm not a coder. This is Game Creator 1 stuff, but support is dwindling. Any idea what scripts I should look it?

[wide nebula]

The one that controls the character, but without any experience on your part, this will require someone to physically get involved.

[sinful cobalt]

Im working on a forklift with moving forks, I added rigid bodies to them and added a fixed joint to keep them together, but now I can't get it move on the Y axis no matter what as seen in the vid. What should I do?

hold on let me convert it so you can see it previewed

[timid dove]

https://docs.unity3d.com/2020.1/Documentation/Manual/class-ArticulationBody.html#:~:text=A prismatic joint is practically,a free or limited translation.

[twin nebula]

I figured this would be the best place to move to as its physics related so

root.AddTorque(Mathf.Clamp(Mathf.DeltaAngle(root.rotation, 90f), -uprightStrengthClamp, uprightStrengthClamp) * Mathf.DeltaAngle(root.rotation, 90f));

I was wondering if any of you may know why this works fine but then at around -45 it'll go really slow?

Sorry it goes to about 47 and then freezes

It increases the rotation by a ridiculous amount I just found out

By like thousands

And that'll be why

Squaring the deltaangle causes really absurd numbers

I've done a bit of a workaround it seems to work fine now

Not code related just angular drag

[sinful cobalt]

Is it possible to fix this from happening?

The goal is to make the fork box collider stop when touching the top box collider and not just go thru a bit and glitch

[timid dove]

Should probably be using ArticulationBody and a Prismatic Joint for this

[sinful cobalt]

Joint for the forks or the cube?

[timid dove]

the cube doesn't need to exist

[sinful cobalt]

its the collider

[timid dove]

the prismatic joint has configurable limits

so you won't need a collider to stop it

[sinful cobalt]

to stop the forks from going past

oh

so i got the artic. body setup on my forks, and I set it to Y drive. im not sure what do from here

it wont..

move

[timid dove]

how are you trying to move it

You should do it via the articulation drive https://docs.unity3d.com/ScriptReference/ArticulationDrive.html

Realistically by setting the y target https://docs.unity3d.com/ScriptReference/ArticulationDrive-target.html

[sinful cobalt]

So this white dashed line that comes when you click "Edit the joint angular limits", how do you edit that

Its just a white line

[frozen sluice]

Can normal raycasts hit / detect DOTS entity?

Or do I have to use the Physics raycast from inside dots to hit other entities?

[hollow echo]

The two physics systems are completely separate

[frozen sluice]

Ok so something like my old shooting designs, I would have to rewrite the player / weapon to utilize dots/ecs and then use physics raycast to do this now?

[fair iron]

before you put an cargo onto a forks, disable box collider, you can use BOOL to toggle box collider and disable/enable depending on situation

[sinful cobalt]

With OnCollisionEnter?

[fair iron]

Ye

Check if the cargo colides

Remove the cargobox collider before you put it on forks

And carry it where ever you need with forklift

If you want to let it go, fist move it away from forklift and reenable box collider or what ever collider you are using

[timid dove]

delete line 74

Well you didn't share your script

so I'm going to just make wild guesses

!code

[flint portal]

Posting code

📃 Large Code Blocks

Use links to services like:
https://gdl.space/, https://paste.ofcode.org/, https://hatebin.com/, https://paste.myst.rs/, https://hastebin.com/

📃 Inline Code

Surround code with three backquotes. Not quotation marks.
To format as C#, add cs to the first line:
```cs
// Your code here
```
Add a comment with a line number if there is an error message.

[stuck bay]

nvm i fix it

[gaunt glade]

Can someone help me out with that green plus ion know what to do and I tried everything

[hollow echo]

https://docs.unity3d.com/Manual/PrefabInstanceOverrides.html

[gaunt glade]

Huh

[gaunt glade]

Yo I still need help

[hollow echo]

Do you need help reading the documentation? It's a prefab instance override.

[gaunt glade]

Then how do I fix cause ion understand at all

[hollow echo]

fix what? It is what it is, if you want to apply it to the prefab, right click and apply it. If you want to remove the component, remove the component

literally nothing is broken

[gaunt glade]

The apply button is gray and won’t work and ion know how to add scripts,mesh colliders and other bs

[hollow echo]

Not sure how it could be grey, can you screenshot it?
Also not sure what you're talking about with the rest of it; you've not provided any information except a vague screenshot photo

[gaunt glade]

Bet hol on

[gaunt glade]

this is what im talking about

[modern sedge]

Could you screenshot the entire inspector for the gameobject

[urban blade]

I have multiple issues and if someone can dm me or call me that would nice. The main thing is that, when I hold down a and d it just kind of goes crazy and when I added and I am completely still the ground buzzes.

[gaunt glade]

Ye hol on

[timid dove]

Like what? Dragging and dropping images around?

[fresh furnace]

yes, dragging, animating..basically want to build the whole thing in unity

[timid dove]

Anything is possible

[stable heath]

Hi guys, have you any ideas for this physics simulation https://youtu.be/4Wl0ksysYKM?si=HdlXLa7Wh0lv2LTb i need a simulation of actual tearing sheet , a bit like ripping paper

Or something like tearable cloth simulation

[hollow echo]

Simulate it offline in a program like Blender and import it as an alembic.
If you need realtime simulation, it'll be nothing like this quality and will likely just require you buy an asset

[stable heath]

yeah i need a realtime one, buy an asset,what asset?

[hollow echo]

I don't know, look for one on the asset store

[stable heath]

I've tried several plugins,all not satisfactory

I also found some on Github ,It's basically a lib for some other platform

[void grotto]

Is there any significant performance hit using a Configurable Joint versus one of the built-in ones like Hinge/Fixed/Spring? If I had two Rigidbodies connected with a Configurable Joint that behaves almost identically to a Spring Joint, would one of them be more performant than the other?

[odd trail]

soo rn im trying to get a perfect bounce using a 2d physic material but i cant get the object to go to the same place it dropped it seems to go higher

[timid dove]

The physics engine is not designed to be perfectly physically accurate. It's designed for approximate accuracy and fast performance

[pure karma]

if you made 2d game that takes place in space how would you want the character to act when it jumps and hits a wall? like in this video. i know its not in unity just asking for opinions

its currently set to fall down once it hits the wall

ithought if it doesnt fall down it would be unplayable

[timid dove]

Depends on the game. Lots of different behaviors would be appropriate for lots of different games

There's definitely no one size fits all solution

[stable heath]

Have anyone any idea for this simulation

[robust fractal]

Hello, can someone explain how to grapple my ragdoll? maybe it's because of mass, but the ragdoll mass is really low.

[unreal bobcat]

So I want to make an ocean along with its physics in unity, but it’s complicated so I’m thinking on making the ocean in blender then using that in unity

But then would it be possible to apply water physics there

[turbid solstice]

this would be very easy in HDRP since it has a built in water system, in the water samples there should be a few scripts related to water physics you could make use of

[unreal bobcat]

Which water samples?

Are you referring to other people scripts?

[turbid solstice]

no

in the package manager, HDRP package there are samples for the water system

[unreal bobcat]

Oh ok I’ll check it out thanks a lot 🙂

[river cloud]

Why does the cube goes inside the car? The car is moving at constant speed

[wide nebula]

How are you applying that speed? Using forces?

[radiant hemlock]

Is there a way to push another object with cloth?

When I look online everything is about cloth colliding with other things but haven't found anything about other things colliding with cloth

[lilac wedge]

I have a simple issue: my object was being blocked by a barrier (as it's supposed to). Now I added a Rigidbody2D to that object, and it no longer is being blocked by the barrier. The collision just doesn't happen. Why? What's wrong?

[timid dove]

Cloth cannot affect any other objects

[timid dove]

How was it moving in the first place if it had no Rigidbody? You should explain more about the situation and how this thing is moving.

[lilac wedge]

sure, this object is being moved because it's a child of the Player object. The Player moves and carries the object (as child) by using rigidbody.MovePosition().
If there is no rigidbody on the object, the box collider barrier correctly pushes away the object (with the player). If there is a rigidbody on the object(dynamic, kinematic or whatever), the box collider doesnt push away the object.

I want to both have a rigidbody on the object (for other reasons, like receiving OnTriggerEnter2D on the object) but also I dont want this to mess up other collisions. I'm confused why adding the rigidbody messes up other collisions.

[timid dove]

The Rigidbody on the parent is enough

You don't need one on the child

Doing that will indeed mess things up

[lilac wedge]

That's why I hate Unity's automagical systems. Because if the rigidbody is only on the parent and not on the object (as you suggest), then the object stops receiving OnTriggerEnter2D which I need for other reasons. It's even worse than that, the Parent receives the calls that the object should receive (when it's the object that touches the trigger and not the parent). Having separate callbacks instead would be useful and sensible.

I understand that the way out of this mess is to always check inside parent which of the gameobjects touched the collider (was it the parent or the child) and work from there - make the parent essentially a manager of the object.

It would be so useful and natural to just subscribe to various calls like OnTriggerEnter2D with chosen objects if I want them. I understand there's no way to do it in Unity.

[timid dove]

The child will also get OnTriggerEnter2D afaik

It works that way for 3D at least

[lilac wedge]

I will test this again

thank you for the suggestion, I will remove the rigidbody from the child and try again

[brisk garnet]

Is there any way to disable PhysicsFixedUpdate?

nvm, turns out there was a single collider in the scene that made it run all the calculations lol

[timid dove]

For future reference yes you can disable the physics simulation via setting https://docs.unity3d.com/ScriptReference/Physics-simulationMode.html to https://docs.unity3d.com/ScriptReference/SimulationMode.Script.html

[brisk garnet]

oo, nice, ty

I should probably set that just in case

[fallen raft]

how would I go about making this effect

[timid dove]

what effect?

gravity?

or drawing the deformed grid?

If it's about drawing the thing, that would be a #archived-shaders question

[dim fulcrum]

I want to use some physics, for decoration basically. I have some targets that can be hit with projectiles and on impact the projectile parents itself to the target and sets iskinematic so it's "stuck" in the target. I added a pair of extra rigid bodies and character joints above my target so it can swing a little bit. This works decently if I bump in to the target with something (or the projectile hits it with it's "blunt" end), but if it gets "stuck" the whole system becomes very unstable and starts to jerk around. My links and target now have mass: 0.4, drag 0.5 and angular drag 0.2 I also tried to limit their motion using the character joint handles but it doesn't seem to stop the jerkiness.

[wraith bison]

hey, so I have a problem with the RigidBody2D physics system when I want to slide right when I hit the ground, the horizontal velocity that I am setting isn't very consistent depending on the angle of which I am hitting. Here I drew a picture to show you what I mean:

[vast abyss]

anybody know how to make it so you can run through this loop like in sonic using a rigidbody movement script?

[timid dove]

The sonic games definitely don't use a "realistic" physics engine like Unity's Rigidbodies.

More likely some kind of custom coded thing with splines.

[vast abyss]

ok good to know

[zenith storm]

i had a thought, if i made a complex model in blender, and want it to use physics to cycle like a bike chain, is that possible to achieve in unity?

[warped slate]

I'm trying to simulate a projectile in my game so I can figure out where it will be in 1 second. I'm planning on doing this using PhysicsScene.Simulate(), but from what I've seen, that jumps the physics forward and keeps them there. Is that the case? If so, is there a way for me to simulate the physics, get the projectile's simulated position and velocity, and then rewind the physics back to where they were?

[fair iron]

you want to predict a target movement to hit it with projectile?

[timid dove]

You need to create a separate physics scene if you want to simulate it with Physics.simulate

Trajectory calculation is in fact the canonical example
https://docs.unity3d.com/Manual/physics-multi-scene.html

[warped slate]

The problem with that is there are walls that can spawn in or get destroyed at runtime, so the scene would need to be constantly updated. Is there any easy way to keep the objects in sync between 2 scenes?

[zealous badge]

Is it possible to use PhysX 5 with Unity?

[elder horizon]

Hello, how do I make one object rotate like the parent object?

[dim fulcrum]

(these are 3 screenshots) 1st: I'm trying to make a target object "dangle" beneath a fixed anchor. My anchor is a rigidbody with iskinetic=true. My target has a configurable joint, with locked position and limited rotation in 2 axis. I set the anchor point to match the kinetic rigidbody. I can edit the limits to something that looks right to me in the editor.

2nd: when I play my target get's offset around the x axis (main axis of the joint).
3rd: It only looks and works how I want if in play mode in the scene view I rotate my connected rigidbody transform to bring the target back to where it was in the editor.

Why is my object rotating it's position, am I missing something to make it start in the same position as in the scene view?

I tried "pre-rotating" my anchor object, and still my object with the join gets rotated and rests on it's x axis limit and I can only correct it by rotaging my anchor object further, I can pre-set my joints angular limits to be "off" visually, but that will make for annoying and error prone setup. I'm sure I'm missing something obvious?

[dim fulcrum]

Can you give more context? Simply by parenting an object it makes it rotate as it were part of the parent object in unity.

[dapper eagle]

Hello, i am trying to look it up but i can't find much info.
Did the settings for a rigidbody to be frozen on certain axis move to a different window?
I wanted to freeze some axis to test some stuff but i can't find the option in the inspector is it only through code now?

[dim fulcrum]

for the record I see them under "Constraints" maybe you just had that collapsed?

[dapper eagle]

Oh yeah no i think i know what happened, i had it in debug mode

[odd trail]

can i ask raycast related questions here?

[quartz vessel]

Does anyone know why my active ragdoll might be imploding like this? I am using Puppetmaster, animation rigging for the legs, and a custom ragdoll

And as shown in the gif, when disabling the active ragdoll the model is represented properly

[timid dove]

Just have your wall spawning/destroying code spawn and destroy the walls in both scenes always.

[compact kite]

Can anyone help me with why only 4 pushable rigid bodys are causing this much lag during testing? Ive changed gravity, drag, mass and the colliders and its still wild.

410 > 18 fps :/

also its not every play, its like super irregular with whether it wants to work or not

[timid dove]

To diagnose any framerate issue you should be using the profiler

my guess would be something editor related.

In fact the Rigidbody inspector window itself was known to cause performance issues in earlier versions of Unity.

[wooden token]

Hello, does anyone know how ragdoll animation works? I've tried ragdoll using joints but the body parts can't be moved manually by transform component on the inspector because (maybe) the joints force/controls them.

[devout token]

They use rigidbodies with joints, so you'd move them using rigidbody class methods rather than transform class methods, just as with all rigidbodies

[wooden token]

so technically ragdoll animation works by giving some forces to rigidbodies?

[devout token]

Yes
If by ragdoll animation you mean ragdolls mixed with animation, or ragdolls that more or less conform to an animated character, you need some extra care

If you overwrite a rigidbody position from script (even when using the rb.Move method) you risk breaking the conservation of energy and may cause unpredictable momentum to be propagated through joints

Force methods are less likely to do that, but you still need to be mindful about how much force you're applying, especially if it has no "physical" source

[wooden token]

what "mixed with animation" means? keyframe? can ragdoll mixed with keyframe animation?

[devout token]

I'd rather ask you what you mean by "ragdoll animation"

Ragdolls by default are not "animated", they're purely physics

But sometimes the goal is to combine the two, such as how games like Gang Beasts do

[wooden token]

I played Fall Guys and noticed that the characters use ragdoll and have animations, but when I tried it in Unity, the body parts couldn't be moved.

[devout token]

Yes, that's indeed what I was talking about

[wooden token]

so its possible to combine keyframe animation and ragdoll physics?

[devout token]

Not directly
You'd want the ragdoll limbs to try to conform to an animated pose using forces

[wooden token]

thanks for the explanation 🙂 it really helped me a lot

[devout token]

These games tend to mix using animations as a reference point for the physical limbs to move towards, but also often avoiding animations entirely when possible
For example so that when grabbing something the character only moves its arm parts towards a point determined by scripts

Animations can be somewhat rigid in this use case, and it'll be difficult for physical limbs to accurately conform to them anyway, at least without glitching
That's why the walking animations in Gang Beasts, Fall Guys and Human Fall Flat have characters with stubby limbs and very loose animations

[dim current]

Hi, the enemy in game is not detecting collision with castle but detecting when a bullet hits it. I checked with physics in game settings tried changing properties on castle but still no detection :(

[timid dove]

What form of "detection" are you expecting

Also it would help if the circle collider inspector was not collapsed

[dim current]

just normal detection when two both collide, just not any physics like pushing happens

[timid dove]

Wdym by detection then exactly

You need to be specific

You mean there's no physical interaction?

Both of your Rigidbodies are kinematic so this would be quite expected

[dim current]

just activating OnCollisionEnter2D function in script

[timid dove]

Not going to happen when they're both kinematic

There's no collision between two kinematic bodies

One of them needs to be dynamic

[dim current]

but i dont want any of them to pushed back if collision happens

[timid dove]

Then why are you trying to use OnCollisionEnter2D?

That implies an action physical collision

Use triggers if you're just looking to detect an overlap

[dim current]

ohhh okok, lemme try that

[dim current]

thankyouuuuu, this worked perfectly

[stuck bay]

anyone knows why this happens to any gameobject when player hold the gameobject and rotate the camera this happens

the gameobject like stretches for some reason

[timid dove]

You have set your object as a child of an object which is not uniformly scaled

That will cause skewing

Make sure any object that has children is uniformly scaled

Preferably 1,1,1 in fact

[stuck bay]

it is 1 1 1

but still do that stretching

[timid dove]

What object is this?

This is the cube. As I said above it's the PARENT of the cube that is the problem

[stuck bay]

it's a cube

[late mica]

I followed this tutorial
https://youtu.be/3avaX00MhYc?si=RYG080owpfooAwsh
and the result was like this...

Anyone who knows how to fix this??

[wide nebula]

Same answer as before, this would require someone doing this tutorial on their own. Perhaps you should try it again.

And don't crosspost in the future

[dim fulcrum]

Using character controller, and I think I picked it up from the starter assets example but on move I add a bit of downward velocity to be able to run down slopes, but even with that my character will occasionally hit a split second of "falltime" when it thinks it's not grounded. This makes jumping when facing downhill feel wonky, because you can do a perfect standing jump, but attempting a running jump will fail depending on the slope / speed. Is this normal? and I just need to tune some constants. (increase the FallTimeout and the amount of negative vertical velocity added?) Or am I doing something wrong?

[near wigeon]

Made a grenade. When you throw it, it can go through the wall or the floor, and I don't need to be a physician to know that's not meant to happen. I don't know why. I'm busy so I'll check on this message later.

[wooden token]

Does anyone know how much angular limit on each body wrist to make better rotation as humanoid body? I see that free limit is horrible and i wanted to make it more "human"
Is this something be done with trial n error or maybe theres document tells the specific value for the angular limit?

I'm using configurable joint

[devout token]

So, what components are responsible for the object's physics and movement?

[near wigeon]

RigidBody and Capsule collider.

[devout token]

And what's moving it?

[near wigeon]

A script called "Grenade Thrower". Want me to send the code?

Could the wall perhaps be a problem?

[devout token]

We have to know how the script is moving the rigidbody to be able to diagnose the issue

[near wigeon]

The entire script?

[devout token]

The relevant parts are the ones that move your grenade object but you can drop the whole thing if you're unsure

[near wigeon]

Alright, I think I can tell what's important. Just a second.

[near wigeon]

 IEnumerator ThrowGrenade()
    {

        animator.SetBool("Throw", true);

        CurrentGrenades--;

        yield return new WaitForSeconds(GrenadeThrowTime);
        
        animator.SetBool("Throw", false);

        if(CurrentGrenades == 0)
        {
            grenadeModel.SetActive(false);
        }

        GameObject grenade = Instantiate(Grenade, cam.transform.position, cam.transform.rotation);

        grenade.GetComponent<Rigidbody>().AddForce(cam.transform.forward * ThrowForce, ForceMode.VelocityChange);
        
    }

The top parts are just ammo and and animation before you throw the grenade. Then it waits for the animation to finish, then it instantiates a new grenade and Adds force to it.

The unseen part of the code contains set variables, input checking and a Method/Function to give ammo.

[devout token]

@near wigeon Nothing weird in the script
Try setting the rigidbody's collision detection mode to some type of continuous

[near wigeon]

That's in the rigidBody component, right?

So I don't have to write it in a script.

Found it.

[near wigeon]

So far it's not glitching through walls, I'll keep testing. Thanks though.

[devout token]

https://docs.unity3d.com/Manual/ContinuousCollisionDetection.html
Here's what CCD does
Discrete detection easily misses small collider contacts, but it was also important to rule out any potential issues in the script

[near wigeon]

Did some testing, not a single time it went through walls. Thanks. I'll read it as-well.

[maiden belfry]

I'm playing around with making destructible objects. Some objects are going to be made of several child pieces. The children should just be colliders that the parent rigidbody uses. When the parent decides it's destroyed, I want all of the children to start behaving like their own independent rigidbodies.

You can't disable a rigidbody component.

Is there a compelling reason to pick one of these two options?

• Make the children kinematic until the parent is destroyed
• Attach the Rigidbody component when the parent is destroyed

In many cases, the children are deactivated entirely until the parent is destroyed, so the question doesn't come up there

[maiden belfry]

It seems like the child rigidbodies wind up "stealing" the colliders

which makes sense

I guess I could just use fixed joints to glue everything together

[timid dove]

Attaching the component is better

1 - it uses less memory overall (none until destruction happens)
2 - Rigidbodies act as graph boundaries for physics objects. When you have kinematic child bodies that means the physics engine sees each one as an independent physics object. This also uses more memory on the C++ side as well as making raycasts awkward and also acting kind of weird physically if they are part of a moving whole.

[maiden belfry]

I'm also a little worried about the overall cost, yeah

i will have to find out about that part!

[hearty plume]

Any idea on how to go about this? Get this error if my prefab has a rigidbody

Invalid AABB aabb
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Unity.Entities.WorldUnmanagedImpl/Unity.Entities.UnmanagedUpdate_00001629$BurstDirectCall:Invoke (void*)
Unity.Entities.WorldUnmanagedImpl:UnmanagedUpdate (void*) (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/WorldUnmanaged.cs:825)
Unity.Entities.WorldUnmanagedImpl:UpdateSystem (Unity.Entities.SystemHandle) (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/WorldUnmanaged.cs:891)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:717)
Unity.Entities.ComponentSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:681)
Unity.Entities.SystemBase:Update () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/SystemBase.cs:418)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:723)
Unity.Entities.ComponentSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:681)
Unity.Entities.SystemBase:Update () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/SystemBase.cs:418)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:723)
Unity.Entities.ComponentSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:687)
Unity.Entities.SystemBase:Update () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/SystemBase.cs:418)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:723)
Unity.Entities.ComponentSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:687)
Unity.NetCode.PredictedFixedStepSimulationSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.netcode@1.2.0-pre.6/Runtime/Snapshot/GhostPredictionSystemGroup.cs:606)
Unity.Entities.SystemBase:Update () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/SystemBase.cs:418)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:723)
Unity.Entities.ComponentSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:687)
Unity.Entities.SystemBase:Update () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/SystemBase.cs:418)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:723)
Unity.Entities.ComponentSystemGroup:OnUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ComponentSystemGroup.cs:687)
Unity.Entities.SystemBase:Update () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/SystemBase.cs:418)
Unity.Entities.ScriptBehaviourUpdateOrder/DummyDelegateWrapper:TriggerUpdate () (at ./Library/PackageCache/com.unity.entities@1.2.0-pre.6/Unity.Entities/ScriptBehaviourUpdateOrder.cs:523)

[hearty plume]

Any idea on how to go about this? Get

[celest wadi]

guys can someone help me?
Where is the rest of information on the Rigidbody? I want to debug it to see where i have problems, but its hidden somewhere, Im reffering to the information about acceleration, push forces, drag.... all the shananagan

[hollow echo]

Window/Analysis/Physics Debugger and select the Rigidbody while the Info tab is open

[celest wadi]

Thanks mate!

[dapper eagle]

Hello, is it possible to perform substepping with forces added every substep?
Basically i would like to keep the timestep at 0.02 but for certain physics with forces i would like to peform substepping for stability. What i would like to do is apply the forces and then have them added and the new velocity of the rigidbody calculated for the next substep is that possible?

[stuck bay]

is there no RaycastHit equivalent to RaycastHit2D.centroid ?

[hollow echo]

There is none, but it's ray.origin + ray.direction * hit.distance

[stuck bay]

caught lacking on my linear combinations

[timid dove]

What i would like to do is apply the forces and then have them added and the new velocity of the rigidbody calculated for the next substep is that possible?
Not without decreasing the timestep.

You could manually call https://docs.unity3d.com/ScriptReference/Physics.Simulate.html with your substep timing and then switch back to autosimulation after

[fading creek]

I'm having troubling figuring this out. So basically, I'm trying to get the ear and the earring to have their own dynamic bones in Unity 2021.3.34, but every time I put the ear name, it goes to the earring no matter what, can someone explain why and how to get it to work properly?

I can also understand if it's just not possible

[fading creek]

I tried to put the dynamic bone on the head bone and exclude what I needed, but I think I'm missing something because they don't wiggle, they just move if the head gets to far (not much, but way noticable)

[fading creek]

YES, I got it, les go

[regal hinge]

This is way too fun

[regal hinge]

force is just impulse with deltaTime factored in

handy thing i found https://discussions.unity.com/t/difference-and-uses-of-rigidbody-force-modes/116629/3

[timid dove]

All forms of AddForce are applied in a single frame

[proud granite]

Hey guys! I'm trying to create a drone by following a tutorial but I can't seem to get even the most basics of physics to work 😄

The Drone has rigid body applied to it, and I use this code to counteract the gravity

rb.AddForce(Vector3.up * (rb.mass * Physics.gravity.magnitude));

In theory it should hover, right? Or am I missing something?

Any help would be greatly appreciated 🙏 I'm completely lost

[timid dove]

This will counteract gravity:

void FixedUpdate () {
  rb.AddForce(-Physics.gravity, ForceMode.Acceletation);
}```

[proud granite]

Actually I just managed to fix it by calling FixedUpdate instead of Update

[timid dove]

Yes that's one mistake

But you should also switch to this simpler more semantically correct version

[proud granite]

Whats the difference between this and my line?

I mean I understand what mine does, how come we don't use a Vector3 here?

[timid dove]

• it's directly using the gravity vector itself rather than taking the magnitude and assuming the direction
• it's using the correct force mode instead of hacking it together by multiplying mass manually

[proud granite]

Oh I see!

[timid dove]

Physics.gravity is a Vector3

We are using a Vector3

[proud granite]

Yep, just realized

Thanks a bunch for helping me!

[knotty stone]

Can you guys perhaps tell me how I prevent slipping of a wheel collider?

I have a bike with 2 wheels (bike is set to 120 mass and each wheel to 20)
Now even when playing with the numbers related to slip... my wheel keeps spinning "free" if I reach a certain "speed" and I cant get past said speed...
Any pointers at where to look for adjustments?

I'd be happy if the wheel would currently just roll and "push" the bike ahead no matter what so I can go from there

[hearty plume]

Quick question on raycast in Unity Physics, if I want to apply changes based on raycast resutls like updating a component, do I have to use
IJobParallelFor in SystemBase and pass nativearrays and component lookup to access the data? I see that IJobForParallel only passes index. I tried doing it on a regular IJobEntity but that didn't work.
Logic seems to work when I do foreach() jobs but was trying to do burstcompile jobs.

[hearty plume]

nvm, after refactoring the code a bit it seems to work. I probably had a bad call or something with string messing my stuff. Remove all strings and now seems to work fine

[gleaming glacier]

So I Have A Game Where You Can Shrink And Grow
You Can Also Spawn Props
If You Are Small And Spawn It It Is Tiny Same For Big
The Issue Comes With Contact Offset
So I Have A Sound Playing When OnCollisionEnter Is Called In The Script
But With Tiny Props The Offset Is Way Too Big
To Fix This I Set The Colliders Contact Offset To The Default Collider Contact Offset Multiplied By It's Size
But That Didn't Fix It And Now I Am Stuck
I Feel Like It Might Have Fixed It A Tiny Bit But The Size Issue Is Still There
When It's Tiny It's Too Big
When It's Big It's Too Small
If Anyone Can Help Me Fix This Please Do It Would Be Greatly Appreciated

[near wigeon]

I don't know how to help but it would be useful for this who do to show your script.

[timid dove]

Is this a poem?

[wraith junco]

@knotty stoneYou'll need to roll custom wheel colliders. The physx ones are un-useable. It's not as difficult as it sounds and I'll give you pointers if you're truly interested.

[vocal steppe]

Does a Rigidbody on a moving GameObject accurately track velocity, if the Rigidbody component is NOT what's moving the object?

[timid dove]

Absolutely not, no

[vocal steppe]

I didn't think it did. Just double-checking something I saw on the forums.

[timid dove]

Rigidbody velocity isn't a calculation of any past motion. It is something that the physics engine will use the next time Physics is simulated.

[tidal isle]

I need a predicted jump behaviour with Rigidbody2D, so I can specify jump height and duration (speed of a jump).

My idea of implementation:
User presses a jump key -> make a check if the player has reached dest position in the FixedUpdate method -> perform linear interpolation of rigibody's position where t (percentage from src dir to dest) depends on fixedDeltaTime.
In the FixedUpdate method:
if(!reachedDestPos) {//perform jump behaviour } else {perform gravity behaviour }

The reachedDestPos variable changes only when the user presses jump and when the transform reaches its destination. It could be related to the t value in Lerp method: bool reachedDestPos = t >= 1;
Do you think this is a good idea? Is it enough performant? Any alternatives?

[timid dove]

Calculate the gravity scale and force required to reach the desired jump height and jump duration before jumping, and simply set that scale and use AddForce once at the start of the jump.

[tidal isle]

You think so? Mass of an object is proportional to its jump force. Does not matter how we change the scale, it will always jump the same height.
Make a mass smaller or jump force bigger -> the object jumps faster and higher.
Maybe I should play with derivatives to achieve a goal.

Another approach is to use one of the easing functions. To simulate gravital jump EaseOutQuart is fine. Then when it reaches a destination -> activate mass;
And now whenever I change a single scale value, it will affect both jump and fall speed without touching a height.

[storm silo]

Hello guys I'm trying to check ground with Physics2D.BoxCast function
I have a LayerMask that I'have already excluded the Player layer.
But appereantly it still colllides with player collider.
How to solve the issue? Here is my code:

private void CheckGround()
{
   
    RaycastHit2D hit = Physics2D.BoxCast(groundCheckOrigin.position, groundCheckOrigin.localScale, 0, Vector2.down, groundCheckLayerMask);
    if (hit.collider != null) 
    {
      
        isOnGround = true;
        Debug.Log("On Ground!"  + " : " + hit.collider.name);

    }
    else
    {
        isOnGround = false;
        Debug.Log("Not On Ground!");

    }
}

[timid dove]

the gravity scale affects the duration of the jump.

There's no way to get a different jump duration with the same jump height without adjusting the gravity scale.

because you mentioned you wished to configure both duration and height.

[narrow galleon]

okay people, I am new at unity I never use it, I need help with a wheel collider that doesnt move when I try

[knotty stone]

Oh I am very much...

[timid dove]

you'd have to show how you tried to move it

also stick to one channel

[narrow galleon]

like this

but when I move it

[timid dove]

first thing's first make sure you're in Pivot mode not Center mode

you can toggle it by pressing Z

[storm silo]

weird , Physics2D.BoxCast does not work with layer masks , I just changed it into OverlapBox and it works now. But it is really weird I don't actually get the difference between two methods. Anyone has idea ?

[narrow galleon]

even in pivot

[bold knoll]

I have ragdoll physics on my player. when the player spawns they will fall thru the floor but if i disable animator and re enable it the player works fine?

anyone know of a fix for that

[analog wasp]

HI y'all, I'm working on a soccer game and could use a hand with the Cloth component. I've got a goal net model ready to go, but setting up the cloth constraints is giving me a tough time — the net just won't stay up. I'm either looking for a fix to my existing setup or someone to set this up from scratch in a fresh project. If anyone here is a skilled with cloth physics and constraints in Unity and is open to a freelance gig, please DM me. Willing to compensate for your time and expertise! Thank you!

[wraith junco]

You'll be creating an imaginary spring with a raycast. If you shoot a raycast downwards 5 meters (the length of your spring), you can see the distance that it hit.
Hooke's law states that a spring's force is proportional to how much it's compressed. If it's compressed 0%, it's exerting 0 force. If it's compressed 100%, it's exerting 100% of it's force.

float springCompression = 1 - (distance.hit / spring.length). This gives you a value between 0 and 1. If the spring is fully compressed, the value is 1. You can then multiply that by a coefficient (arbitrary spring force number of your choice) to add force upwards at the wheel well of your car. Congratulations, you've made a spring.

The wheels are visuals only. There are no colliders on the wheels. Your car is basically just a hover craft.

This is also a perfect spring. The car will bounce up and down and never run out of energy. The last step would be adding a damper based on the spring speed, to slowly suck energy out of the spring. If you get the first step working, I'll show you how to do this.

[knotty stone]

So essentially what you're saying is, don't try and make it "roll" per see... and instead make a "hovercraft" which I can accelerate / decelerate / rotate / ... via applians of force vectors and torque... more work than I wanted, but sure, I can get that set up

Visuals are then just "after effects" as always

And seeing that I try to build a bike, "suspending" the chassy from another "spring" as you say can help me simulate the pivoting of it when turning...

Smart... thank you already a bunch!

How do I stop my construct from "jumping" though? - even if I apply the exact amount of force upwards as is applied down, in unity... the "construct seems to woblle" - normal? Do I have to manually compensate or is there something that can help me make it not wobble 0.001 mm every update

[haughty berry]

Is it normal practice to have individual collider for each tile? In my case player constantly gets slightly pushed away from wall/floor when moving along.

[timid dove]

No. When using Tilemaps it's normal practice to use a TilemapCollider2D.

However you seem to be using 3D physics. So likely you'll need to write a utility to generate a MeshCollider from your tiles.

[haughty berry]

Ok. Thank you.

[tidal isle]

Sprite has a pivot at the bottom, it is used for scale property. How to rotate object not from the pivot but from the center like in the image?

Note that creating another GameObject is not allowed.

[timid dove]

You can change the pivot of your sprite in the sprite editor

otherwise, you need to do both a rotation and a translation if you want that behavior

Or you add some empty parent object to achieve your desired effect

[tidal isle]

Then the sprite will scale from the center.

[timid dove]

Then go with one of the other two options I presented you

Or use https://docs.unity3d.com/ScriptReference/Transform.RotateAround.html

[tidal isle]

I've found RotateAround method

I guess it's also possible with Matrix4x4.

[timid dove]

Just know that RotateAround is a shortcut to the second option I mentioned:

you need to do both a rotation and a translation if you want that behavior

[void rune]

Bruh, I spent like 30 mins making a simple yet accurate mesh for my gun and it doesnt even work. Why did they remove this feature

[wraith junco]

Wobbling sounds strange. Post a video and your code and I'll see whats happening

[wraith junco]

The turning part will happen naturally when we create sideways tire friction. Basically you'll get the sideways velocity at the position of the "wheels" (empty gameobject where your raycast shoots out) (few ways to do this) and simply just multiply it by another coefficient (arbitrary value of your choice). So the more the car is sliding sideways, the more force we add to counter that sideways sliding. To turn the vehicle, all you'll need to do is literally just turn the front "wheels".

After you get the spring working, you'll be about 1/3 done with the whole project. It's really a simple project and a great thing to know how to do.

Also I've never made a bike before. I assume this bike only has 2 wheels. This might be a little more complicated than a 4 wheel car. Basically just getting it to balance properly.

[timid dove]

Because the performance was terrible. Is there a reason you need a concave mesh collider?

Just use a convex collider or build the collider from a couple of primitives

[void rune]

not really I just thought Id use what I had made

[timid dove]

you can use it

check the Convex box on the mesh collider

[void rune]

yea but then the collider becomes super innacurate

[timid dove]

Then, as I said before, build the collider out of a couple of primitive colliders

[void rune]

yup thats what I did

[halcyon oracle]

Hi, so I created a car model in Blender, then imported it to unity. This car has a raycast based suspension, and the boxcollider in the car makes the center of mass not perfectly centered, so the car is moving back a bit. Is it possible to find the „perfect” center of mass so the car won’t move?

[void rune]

I am using the xr interaction toolkit to grab and handle this weapon but sadly it happens to lag behind when I move, smoothing the position does not help and the rigidbody is already interpolating the movement. What causes this problem?

[timid dove]

How are you moving it?

If it's a Rigidbody with interpolation it needs to move in FixedUpdate with MovePosition

You probably also want to make it kinematic while it's being held

[void rune]

nah cuz i want the collisions

but even with a fixed timestep of 0.001 it still stutters a little bit

its ridiculous

meaning that the physics refreshes 1000 times per second and it still stutters

something is wrong

how do games like h3vr, hl alyx and tavr handle collisions but keep their weapons stable

[timid dove]

Again how are you moving it

They move their physics objects properly i.e. with MovePosition in FixedUpdate

If you don't do that, interpolation isn't going to work

[void rune]

Im moving the rigidbody using velocity

[near wigeon]

I'm trying to make a ragdoll for my enemies and two problems came up. First is that the arms colliders are messed up and I don't know how to align them. Then, when the enemy is in ragdoll, he would become invisible when approached.

[timid dove]

Want to show your code?

[verbal geyser]

Hello, I'm creating a 2D game and I have a problem with MovingPlatform.
When Player is entering/leaving the platform (setting/removing parent of player), it's pretty jittery for a part of a second.
Player moving on the platform is smooth. There is only problem with leaving and entering.

Platform has kinematic Rigidbody2D with Continuous collision detection and Interpolate option.
Player has dynamic rb, with interpolation too.

It jitters when I leave it when it's not moving, so I don't think it's a problem with its movement.

[bleak umbra]

You can’t do platforms by parenting

[verbal geyser]

How, then? I tried to do it without parenting before for a very long time, and I couldn't make it work good.

[bleak umbra]

You can check out KCC (free) and see how they do it. It’s not a trivial thing to get right. https://assetstore.unity.com/packages/tools/physics/kinematic-character-controller-99131

[verbal geyser]

Isn't that 3D-only?

[bleak umbra]

basically you detect the platform/collision and add its movement to your character‘s

[bleak umbra]

No

[verbal geyser]

Okay, thanks. I'll try to do it

[bleak umbra]

The idea is the same in 2D

[hazy atlas]

Rigidbody. The player moves toward this slope, and slips through. I want it to stop moving and not slip through

[tidal isle]

Oh my gosh LeanTween eats so much performance. Any alternatives?

[void rune]

Thing is that its not mine, its the xr interaction toolkit

[dim fulcrum]

I havent tried to properly replicate it in a small example project but I wanted to add some decoration, and whenever I try to add a "cloth" component to a syntystudio's prop prefab unity crashes, is there some known issue, like "a cloth component can't work with a mesh collider" or something like that?

[timid dove]

Then why did you say you were moving it with velocity?

What you need to do is move an invisible empty object with the XR toolkit and have the real object follow it in FixedUpdate with Rigidbody.MovePosition

[tidal isle]

So I've made my own MonoBehaviour script. It has serialized field of type AnimationCurve, so I can use any easing functions I want. With the Evaluate method of the AnimationCurve instance it returns float value of the easing function based on animation time. You can call the method in Update or use it as a Coroutine (make sure it returns IEnumerator).

I'm thinking about creating my package for more optimized tweening.

[jagged dust]

So im using a configurable joint to make a wrist hold a sword and the sword move with colliders, the issue im having is that the wrist (the gameobject with the joint) is staying at 0,0,0 and not moving, im trying to move it

the sword is stuck with the wrist aswell

[orchid path]

Hi. I have an issue with child colliders influencing the rigid body just by existing.
This object has many child objects with colliders
Im not sure if thats the rule but the more colliders eg at the front of the object, the heavier that part is (thus influencing rigidbody physics)

I had to disable all colliders to get a more stable behavior and im not sure what can I do because I need colliders too
Some questions:

1. What is the rule? Is it based on amount of colliders or on volume of colliders?
2. Would merging all colliders work?
3. What can I do to balance/stabilize it? I have a rather finetuned script so id like to do it without additional AddForce/Torque's if possible

[timid dove]

What is the rule? Is it based on amount of colliders or on volume of colliders?
Unity assumes all colliders are equally dense and calculates a center of mass from the total volume distribution of the object.
Would merging all colliders work?
It will still do the center of mass calculation
What can I do to balance/stabilize it? I have a rather finetuned script so id like to do it without additional AddForce/Torque's if possible
You can disable the automatic CoM calculation: https://docs.unity3d.com/ScriptReference/Rigidbody-automaticCenterOfMass.html
And you can manually set your own CoM: https://docs.unity3d.com/ScriptReference/Rigidbody-centerOfMass.html

[pure karma]

can man change the dynamic friction of a cube shapes as ground?

[timid dove]

https://docs.unity3d.com/Manual/create-apply-physics-material.html
https://docs.unity3d.com/Manual/class-PhysicMaterial.html

[pure karma]

thank you very much. I read them and now realized you could give it to colliders. So even if it was invisible collider I could do some cool stuff with it. I played with dynamic friction of ball but (as far as I'Ve observerd) nothing changed. So I thought adding it to ground would give desired result

[stone gorge]

So, i have a lot of sprites that must have the same custom physics shape. And must be VERY ACCURATE, almost pixel perfect.
The problem is that every sprite have a different pivot, so i should drag the physics shape manually even with the drag and drop feature... advices?

[gleaming gorge]

is unity cloth physics works best with one sided cloth mesh? using it with two sided (each side has their own vertices set) tends to 'crumple' the cloth

[indigo portal]

I am trying to prevent the upper cylinder from falling over by limiting both the X and Z angles to 60 degrees, but this leads to it falling into these "corners" where both angles reach 60 degrees, which is further away than the intended 60 degrees that can be reached by only one angle. I tried unlocking the Y axis, setting a limit on either the X or Z axis, and locking it on the other, but this leads to it swinging around in weird ways. Is there a way to get this joint, or a different type of joint to rotate only a certain amount of degrees away from the upwards direction?

Apparently I did something weird, I tried again and my original attempt to fix it worked.

Hooray!

[marsh dirge]

Can someone help me with this, I have box colliders on both GameObjects but when I try to walk trough car which shouldnt happen because of colliders, he just walks trough!? Here is picture of paused game where my player is walking and he first interacts with box collider but after second he can just pass trough. Any help?

[pure karma]

whats taking so long for this 90 tons of spaceship to lose its momentum after it hits the barrrikat? I want it to happen instantly (tried many masses for barrikat its currently 90 thousand)

after it hits second one it seems like there is lag

like 150 ms

because it takes that long for its movement to change relative to collision

[timid dove]

is the ship just drifting on its own momentum? Or it's controlled by a script?

anyway the thing would have to be significantly heavier than the ship to cause that - it's oroibably better if the barricade is just kinematic.

[pure karma]

controlled by script

[pure karma]

👍will try when i get home

[pure karma]

didnt solve the issue

What I tried:
setting barriicade mass to various values ranging from 0 to 90000
setting barricade to kinematic
setting spaceship to kinematic
played around with every setting there is on the right sight of the screen (inspector)

this is the only script in the project

for movement control

It kinda works okayish with kinematic unchecked but there is a slight lag

maybe it is not an issue at all. im not very familiar with psyhics engine of unity

[timid dove]

Well yeah then it's your script's fault

[timid dove]

You're not even moving it with the physics engine

This is teleporting the object

[pure karma]

okay then Ill look into it. I thought inspector already held pshyhics components like in gamemaker

[timid dove]

This has nothing to do with the inspector, it's your code

[fathom gale]

hello everyone. i wanted to make landing gears for... em, lander. But spring joint looks a bit too... springy? it bends, bounces after lift-off, rotates and all kinds of things i don't want. I just want it to damper some impact on landing and make gears independent form ship so it looks cooler. Do i need to mess with configurable joint or there's easier way?
(cube is playing gear's role, project is 20 minutes old)

[fathom gale]

i mean, configurable joint looks great on droptests, but flight physics feels really... wrong, especially on torque control

[low imp]

guys, in my project when the cube falls from the platform it falls very slowly even if all rigidbody settings, why? (i'm beginner)

[inner thistle]

You'll have to give more details than that

[low imp]

I'm making some code for ML-Agent and I "PinoBody.velocity = transform.forward * Speed;
" this in the void OnActionRecive

and during the training my cube get out the platform but it doesn't fall

[inner thistle]

well yes, transform.forward doesn't point downwards

[low imp]

How can I modify the code to avoid this problem without changing how it works?

[inner thistle]

You have to keep the downwards velocity:

Vector3 velocity = transform.forward * Speed;
velocity.y = PinoBody.velocity.y;
PinoBody.velocity = velocity;

for example

[low imp]

Are there other methods to that? I would like physics to be applied to the object and not to be an "artificial method"

[inner thistle]

AddForce

[low imp]

Like that?
Vector3 moveDirection = transform.forward * Speed;
PinoBody.AddForce(moveDirection);

I'm still trying to figure out how the parameters work correctly

[inner thistle]

If OnActionReceive is called on every FixedUpdate step, yes

[low imp]

i don't have FixedUpdate or Update

[inner thistle]

How does the physics engine run then?

[low imp]

I did similar to what is in the GitHub examples and tutorials

[inner thistle]

That doesn't tell me anything but as long as you do the AddForce once per physics step then it should be ok

[low imp]

ok thx 🙌

[timid dove]

You don't want to add force here - it's not going to help

this is not right

what nitku shared before is correct

It's not "artificial"

It's allowing the physics engine to work normally on the y velocity, and letting your code determine the x/z velocities

Also if your object is tilted then it won't really work either. transform.forward is a little suspect here

[low imp]

By artificial I meant that I didn't want to say the speed with which the cube must fall, I want it to fall according to the force of gravity and its mass

[timid dove]

yes, Nitku's solution does exactly that

also gravity causes all objects to fall equally, regardless of mass

[low imp]

I realized that using transform.forward and/or .velocity overwrite the gravity

[timid dove]

they do not

if you do what Nitku said

[cedar anvil]

Hi, so I am trying to implement an animation of something like this: https://www.youtube.com/watch?v=LXJUYumwh-k. I am working on the color part when the rotating object comes in contact with the stationary object. I basically implemented a collider for each tooth so to speak and I am not sure how to go about it after taht. Is there a way where you change the color of a gameobject based on the percentage of alignment between the two objects?

[timid dove]

those things you mentioned are just values, they don't "overwrite" or actually do anything on their own

[inner thistle]

velocity.y = PinoBody.velocity.y;

This line specifically says "don't touch the Y velocity, use whatever the velocity already is"

[low imp]

oooh, okok i didn't undertand sorry

[timid dove]

I would not be using physics/colliders for any of this

it's all math

[low imp]

Thx now it definitely works better except that now sometimes instead of falling it freezes in a strange way off the platform without falling for a few seconds (as if it were trying to get back on the platform anyway

[timid dove]

is it rotating as it falls off?

[low imp]

try to rotate and it moves

For example, It's been in that position for almost 3 minutes now

It unblocked for a few minutes and then returned to a similar position for as many minutes

[timid dove]

yeah because as I mentioned way above transform.forward is going to be problematic if it rotates

[low imp]

oh, ok there is a way to fix this?

[cedar anvil]

how do you think i would go about doing it using onTriggerStay if I have a gameobject for the stationary tooth and another gameobject for the rotating tooth?

[timid dove]

I wouldn't use OnTriggerStay at all. I would do all of this with math and probably a shader.

OnTriggerStay doesn't seem to be useful in this situation

[low imp]

Is there any way to make a cube move like transform.translate does using physics?
I don't want to activate the Unity constrains because I want the cube to be able to rotate in all direction (for example by jumping and hitting the edge it would fall while rotating)
I managed to solve many problems with the old code and initially transform.translate was the best alternative I found

[unreal marten]

any idea why hinge joint is bugging?

[timid dove]

give it a velocity in FixedUpdate

[low imp]

I tried it only that it rolls, I would like it to move without rolling

[timid dove]

I want the cube to be able to rotate in all direction

You said this

now you are saying the opposite

which is it?

[low imp]

rotate in Y axes

[timid dove]

then lock the other rotation axes

[unreal marten]

i think it's because of my player controller, what's best solution for player controller with a little bit physics? I have now made it with capsule and MovePosition

I want player to interact with physics but not much, character controller I think can't interact with physics

only gravity

[low imp]

I would like something like this

[timid dove]

that's rolling

maybe what you want is just to reduce friction?

but also this is definitely not using anything like "transform.Translate"

this is all physics

[low imp]

How can i reduce friction during the movementon the platform?

I want it to rotate using physics but the movement on the ground I want to happen without rotation
I know maybe these are noob topics but the physics part I'm still trying to understand how it works

[timid dove]

with a physic material of course

https://docs.unity3d.com/Manual/collider-surfaces.html

[low imp]

Is it enough to create the physical material with friction at 0 and put it in the collision of the cube to make the cube slide even using AddForce?

[timid dove]

note the Friction Combine and Bounce Combine options as well

those will interact with the material of the ground/other surface it's touching

[low imp]

Are they good for interactions with the floor and walls?
Or do I have to change the type?

I wanted to simulate a small bounce with the collision of the cube on the wall (especially in the air)

[timid dove]

there's no global definition for "good" here. It's up to you

[low imp]

I'm trying the new code with frictionless physical material but there are some problems, the cube seems almost anchored to the starting point without being able to move or if you want it moves a little like 0.001 but after a few seconds the movement resets.
Only jumping works correctly

[dense veldt]

Anyone know why my object keeps being "not grounded" going up a slope? But when I stop in movement, it returns to "is grounded" on the slope itself. It only does this going up.

if (rb.velocity.y <= 0)
        {

            Collider[] hitList = Physics.OverlapSphere(feetCol.transform.position, feetCol.radius + 0.3f, collisionLayerMask);

            if (hitList.Length > 0)
            {
                isGrounded = true;
                custGravity.gravityIsOn = false;
                return;
            }
        }

        isGrounded = false;
        custGravity.gravityIsOn = true;

[timid dove]

Your grounded check code only runs when y velocity is negative

Otherwise you're setting is grounded=false

[dense veldt]

Is negative or zero

So ...wait...

so is moving up the slope makes my y velocity...oh

Ah...

I see now lol. You're right. Thats very important

See my logic was that I dont want to always do this check unless Im falling. I assume this would work by default. But seeing as moving the rigidbody automatically creates an upper velocity motion, I need to account for that.

So I guess I just have to eat it happening regardless.

Yep. That worked now.

[stuck bay]

What's funny is you basically just accidentally implemented rampsliding from source games

[dense veldt]

Now I need to find out why this counts as "grounded."

This logic should stop that:

if (feetCol.transform.position.y + feetCol.radius >= hit.transform.position.y)
                        {
                            isGrounded = true;
                            custGravity.gravityIsOn = false;
                        }

This is the character jumping "up" through the platform

Ignore the box collider. It doesnt interact with it

feetCol is the capsule collider around the feet

[dense veldt]

had the +feetcol.radius on the wrong side. I should be checking it on the right.

However, as you can see, this fixes that issue but causes another: now Im never grounding cause Im always less than that condition in any other situation. Going to have to go after that case myself.

[junior thicket]

Im working on precedural animations and the charachter joint doesnt allow for a full 360 degrees rotation(it connects the top collider to the bottom one) and if the top rotates too far none of the two colliders point where they are supposed to point(made using spring joints and i marked the spring anchors in the images), how can i allow for a full 360+ rotation ?

[elder horizon]

Does anyone know why these 2 rigidbodies not collide?

[timid dove]

do they have colliders?

[devout token]

It's best not to needlessly crop screenshots
we can spot way more clues that way

[elder horizon]

Nvm

[atomic garnet]

Does anybody know how to clamp the rotation of a rigidbody? I'm trying to make a car that can move up and down terrain which works but sometimes it flips and I didn't know if there was a good way to clamp that rotation so that the car doesn't flip over.

[haughty hornet]

You can check the checkbox "Freeze Rotation" on your rigid bodies through the editor.

[wicked phoenix]

Hi, is there a way to make Box Colliders more accurate when they're being moved at high speeds? Say you have a box collider on a sword and an animation plays which swings the sword. If the animation is too fast, the box collider will sometimes skip distances and miss the target completely

[junior thicket]

I have two boxes connected using a configurable joint with all axis locked other than the y rotation but for some reason if i add a force to the top cube thats the one with the joint it sometimes moves and gets seperated eventho its positional axis are all locked in the joint

[untold agate]

I was playing rocket league the other day. I started wondering how they calculate the speed of the ball and the direction it will go after hitting. Can smbody help

[junior thicket]

probaply something like this https://en.wikipedia.org/wiki/Elastic_collision#Two-dimensional_collision_with_two_moving_objects

[untold agate]

Thx

[dense veldt]

I would say pause the game, then do a Step to Next Frame (the Next button in the Game window), to make sure you're correct about that. Also make sure your box collider is a child of a model object in the hierarchy. This way it moves with the animation in the scene itself. Though the way traditional development did it was by having different frames activate different colliders like in fighting games. You can have a keyframe set off a function event that can turn off one collider and turn on another.

Remember: if you want to turn off a collider the true way, you use .enabled on the collider NOT the gameobject.

But if it's just movement, with the same size, then just make sure it has a parent to attach to (the sword for instance). Usually does well enough.

[atomic garnet]

I was already aware of that. I was asking if there was a way to clamp the rotation between certain values because I wanted it to still be able to rotate but not the full 360 degrees

[oblique hollow]

i am having huge problems with my game's collision i just couldn't get it right, here the player collides with the walls for a bit and then skips past them, if i wanted them to collide completely i will have to turn down the speed massively which goes against the game's idea of dodging obstacles at a high speed of control,i tried using individual box colliders instead of a mesh collider, i tried making the box colliders thicker, i tried scaling down the objects because i heard unity can't handle collision of large objects properly, i tried moving with rb.MovePosition instead of transform.position, i tried raising the value 'Depenetration velocity' in the physics settings but still after all these changes even though some of them made the collision better, it still doesn't work as intended (to not skip past the walls no matter what) and something that i couldn't get on the recording is that even if it collides with the 4 walls, the corners of the square can still be penetrated if you had the ball going in same corner as well then the ball sort of pushes you out of the cube. any help or direction is greatly appreciated

[scenic thunder]

When my character bumps into a collider, it sinks into the ground. I know it's because of the capsule collider curvature on top of it, but is there a workaround for that ?

[scenic thunder]

I'm really not sure but you could try to set your RigidBody Collision Detection to Continuous

[wispy patrol]

Hey guys, how do I create a mesh collider based on child game objects?

[tired panther]

Does anyone have any idea, why the black squares inside the green square decides to rotate like that?

[unreal marten]

hey, I want to create hinge joint on runtime, I even printed all values to 100% recreate it

void Start() {
    // print all HingeJoint properties
    HingeJoint hinge = GetComponent<HingeJoint>();
    print("HingeJoint: " + hinge);
    print("HingeJoint.anchor: " + hinge.anchor);
    print("HingeJoint.axis: " + hinge.axis);
    print("HingeJoint.connectedBody: " + hinge.connectedBody);
    print("HingeJoint.connectedAnchor: " + hinge.connectedAnchor);
    print("HingeJoint.autoConfigureConnectedAnchor: " + hinge.autoConfigureConnectedAnchor);
    print("HingeJoint.useLimits: " + hinge.useLimits);
    print("HingeJoint.limits: " + hinge.limits);
    print("HingeJoint.useSpring: " + hinge.useSpring);
    print("HingeJoint.spring: " + hinge.spring);
    print("HingeJoint.useMotor: " + hinge.useMotor);
    print("HingeJoint.motor: " + hinge.motor);
}```

```cs
HingeJoint hinge = part.gameObject.AddComponent<HingeJoint>();
hinge.anchor = Vector3.zero;
hinge.axis = Vector3.up;
hinge.connectedBody = gameObject.GetComponent<Rigidbody>();
hinge.connectedAnchor = new Vector3(2.12f, -0.06f, -1.94f);
hinge.autoConfigureConnectedAnchor = true;
hinge.useLimits = true;
JointLimits limits = hinge.limits;
limits.min = part.hidgeJoint.min;
limits.max = part.hidgeJoint.max;
hinge.limits = limits;
hinge.useSpring = false;
hinge.useMotor = false;

https://cdn.discordapp.com/attachments/763495187787677697/1206950800216301578/2024-02-08_18-33-12.mp4?ex=65dddf86&is=65cb6a86&hm=4228f2e7ab2119b39c62fd5de4a8c04d4d04780bb7c1d5124f0eddaf807e3061&
but it doesnt work at all, when hinge joint is added from editor window it works, but from script its buggy a lot

does anyone have any idea why it behaves different when created from script?

or maybe have an idea how can I disable hinge joint and later enable it

[cold socket]

Huh? There’s not nearly enough context…

[unreal marten]

anyone? I really need help with that

can't fix that for 6 days now

[potent nova]

I know what the issue is in the code but I don't know how to fix it due to my lack of physics knowledge

the projection begins at the pulled back position, but I want it to return back to center (like a slingshot) and then project from there

[dapper lichen]

I'm not sure I understand this last sentence, can you please clarify?

[potent nova]

i can draw it

[woeful pulsar]

As long as you can explain the target behaviour clearly

You want the velocity to be defined by the direction and the magnitude of the pull of the slingshot?

[potent nova]

not exactly sure what that means but the projection is not like a regular slingshot

I coded it so it compares the starting position to the original position, and that vector gets multiplied by a variable to provide it's velocity

[woeful pulsar]

Okay, and how does that differ from the behaviour you are trying to achieve?

[potent nova]

it projects the arch from a pulled back state rather than firing through the center of the slingshot and then projecting and releasing it from that point

i sent a video which shows the irregular motion

When i find a way to attach rubber bands it will be more clear

[unreal marten]

you want it to go above the center?

[woeful pulsar]

What you can do is disable gravity until you cross the slingshots origin. Instead of adding force once at time of release, you add force continuously.

The force added should factor the current magnitude of the stretch

[potent nova]

i dont think so? rather through the center

[unreal marten]

you can disable gravity as foo mentioned or just do animation

in Update() every frame interpolate position

and when it's finished apply force

[potent nova]

that wouldn't affect it's motion when the gravity turns on though?

it would travel in a straight line to center then project as usual?

[unreal marten]

yes

[potent nova]

i mean i should try it obv but what could I use to show it's passed the centre

[dapper lichen]

is it correct to say.. the path of the ball should be a straight line between release point and slingshot center point- and AFTER that it should follow a curve?

[woeful pulsar]

@potent nova Well the motion would be altered by gravity as it should in such a game

[potent nova]

pretty much, if that is what is the most realistic projection of a slingshot

[potent nova]

i mean the gravity bit before but borsuk said it wouldn't

[dapper lichen]

it's not the most realistic at all, but it is perhaps more "playable"

[potent nova]

what would be realistic

i just want it like angry birds pretty much

[woeful pulsar]

I don't think you will get a more accurate simulation than by just computing the force to add each frame. You'll need to animate the rope as well and that animation will be affected by the magnitude of the pull, so might as well kill 2 birds in 1 stone

[potent nova]

you mean more accurate than the one suggested?

should i stick to a line renderer or use a stretched square sprite for the rubber bands

[woeful pulsar]

Which one was suggested? Your initial idea to compute velocity based on dir/magnitude once at release time?

If so, then yeah definitely

[dapper lichen]

^right. the sligshot pouch pushes the the ball until it reaches sligshot center. The distance from the center will be proportial to the force it applies (the band is stretched more or less)

[potent nova]

okay cool ill do that then

any pointers on how I can animate the rubber band sprites?

I haven't made any objects which rotate at a pivot point

I know how to make it follow the mouse though

[woeful pulsar]

with blood and sweat

[dapper lichen]

note! it will STILL not pass exactly through the center. You'll have the sligshot band force, AND gravity BOTH acting on the ball.

[potent nova]

i dont understand

if it has no gravity wouldn't it travel straight through the center

[dapper lichen]

yes it would. if you turn gravity on only at the center point, then my warning can be disregarded.

[potent nova]

okay cool but how else were you thinking it would travel for it to not go through the center?

[dapper lichen]

if you left gravity enabled the whole time.. then WHILE the sling is pulling it towards the center, gravity is ALSO pulling it down. so, the NET force (adding both force vectors) would be towards just below the center.

[woeful pulsar]

@potent nova It's kinda hard to tell but watching some angry birds gameplay, it looks like it's just a sprite rotated according to the perpendicular angle of the pull, and stretched according to the magnitude. The tips are hidden behind the slingshot itself and a little pad at the back as to prevent the artifacts near the edges

[potent nova]

how can I anchor one side to the point its being pulled from?

[woeful pulsar]

You don't, you put the spriterenderer object in the center

[potent nova]

ohh okay#

[potent nova]

that causes the sprite to anchor around it?

Thanks for the tip

[woeful pulsar]

Anchor around what? You need the sprite to cover the distance from the max pull position to the slingshot

It just needs to be in the dead center, and scaled according to the length of the pull

[potent nova]

the pivot point of rotation would be the sprite renderer?

[woeful pulsar]

sure, its relative up would be the vector perpendicular to the pull direction

and its relative right would be the (origin - pull position) vector

[potent nova]

what would I search up so i can learn this

[woeful pulsar]

What part is causing confusion? I can try to elaborate.

[potent nova]

everything from this point on

cause i don't know how a sprite would scale from one side up, wouldn't stretching it cause it to stretch in both directions

and im not sure how to set the pivot point

[woeful pulsar]

Yes, it would cause it to stretch in both directions, this is why, by being centered, you would get the desired results

Ah, I see. The sprite importer can manually configure pivots.

[potent nova]

ohh okay

[woeful pulsar]

This is what is causing confusion I assume?

[potent nova]

so that's how unity knows where to pivot rotations?

[woeful pulsar]

I meant the transform of the gameobject when you are manipulating it within the scene

[potent nova]

sorry what did you mean this for

[woeful pulsar]

Okay, so leaving aside the concept of pivots for the sprites. Each object has a transform. That transform can be used to translate, rotate and scale objects in space.

Say you design your rubber band with a spriterenderer. That sprite needs to cover the distance between the position of the tip of the slingshot and the pull position.

This can be achieved by positioning the transform of the spriterenderer in the center of the 2 positions above and scaling the transform so that the sprite fills the entire gap. The transform should also be rotated so that the stretch axis matches the direction of the pull.

Think of your spriterenderer as a billboard and imagine you can squeeze/stretch that billboard, and all that is done by modifying components of the transform component itself

[potent nova]

i understand everything but what do you mean positioning between the gap?

I will have two slingshot bands

which originate behind each prong of the slingshot

[woeful pulsar]

Correct, since the render order matters, 2 are needed.

So for instance, for the one drawn on top, the positions are

• the top of the forward most prong
• the position of the finger/mouse or whatever

If you were to use a linerenderer as you suggested above, those would be the 2 points you'd use for the line drawn on top

[potent nova]

but i mean it would have two band connections to the mouse like a slingshot, so would that require 4? or has there been a misunderstanding

[potent nova]

and im sorry but two what? pivot points?

[woeful pulsar]

You want your slingshot to have the design above?

[potent nova]

it will have to bands

[woeful pulsar]

In the case of angry birds, there is 1 large band. That large band is designed with 2 sprites (from my assumption). One rendered above the bird, one rendered behind.

If you want the design above, you could still get away with having simply 2 sprites and have your actual sprite texture contain both bands, or you could also have 4 sprites. The concept is the same.