⚛️┃physics

[drifting sleet]

so i'm trying to say that you're not necessarily doing anything wrong, you can probably set up the car. the issue is "tech art", you can't just take a vehicle model and rig it up. the geometry has to work a certain way, and you have to figure out how to clean it up

[hollow apex]

i took the car out of asset from the asset browser of unity, i would assume the geometry should be game ready

[drifting sleet]

oh well

[hollow apex]

okay so everytime i use that model for the car body with no collisions it does that, its bugged ill try something else

i fixed it i think

[dapper wigeon]

I'm not that familiar with IK, but isn't it in itself kind of a physics cheat? I mean IK moves parts directly without the use of force?

[hushed salmon]

this is oddly satisfying

[unique cave]

Have you constrained the movement on X axis?

[hushed salmon]

nope

its litteraly just a because its a perfect angle

[dapper wigeon]

Hell no xD

[hushed salmon]

Hell yess...

[unique cave]

Then its really satisfying indeed

[dapper wigeon]

High friction? O_o

[shell geyser]

hello i don't know where to ask this question but how can i build a cube with probuilder ? the black menu wasn't here before there was a build button

like this

[craggy siren]

Hi, my chains always stretch. How can I fix it? (I use obi rope package).

[frigid pier]

@vague sentinel Don't cross-post, don't tag random people not in conversation with you.

[vague sentinel]

sorry

[modern seal]

hello, i have been struggling with this for ages and have found no solution online. I have a script that detects collisions and performs a function on this pink rubber bouncy physic material 2d. the player has continuous collision detection on, yet the collision is never detected when the rubber has bounciness. when i put the bounciness to zero, the collision is always detected. please help!

[errant gazelle]

Probably he has 2 replicas of the mech thing, one that does the IK and the other that is physics based, and with some configurable joints he adds forces to try to replicate the IK version current bones rotation

[modern seal]

does anyone know a solution for this

[rigid grotto]

a'ight peeps

I need a genius to help me please. I've been stuck on this mf problem forever
https://gyazo.com/c3dbc5017cbccc772415716880d3e406

been stuck on it for 12 days and nobody responds when I type it out so here's a gif

needs a solution

I've posted this in every relevant channel and nobody responds so i'm aboutta start getting medieval

[timid dove]

You should explain the problem otherwise nobody knows what you're asking for help with

[rigid grotto]

it's pretty obvious just by watching the gif

but explaining hasn't yielded any results

days later still no replies to the explanations

but essentially the IK targets for the arms are children of the gun

you move the IK targets directly, the arms move

you move the gun

the arms don't move

[timid dove]

It's obvious only if you're intimately familiar with your project

I just see someone moving an object up and down

Anyway this isn't a physics issue it's #🏃┃animation

[rigid grotto]

bro i done posted this everywhere

not a single soul can give me an answer

[rigid grotto]

and i've asked in several servers

[timid dove]

that doesnt change the rules

[rigid grotto]

i'll post where i have to get a solution 😂 tbh i'm getting tired of no one being able to help

if I get kicked from the server it's not like i'm getting help here anyway

maybe posting it in different channels, someone with the experience required will be able to help

it's partially related to physics because it handles IK which is in part physics and mathematics, as well as animation since IK is used for animating optimally, as well as programming because there are programmatical solutions too that I don't know

so I posted it in all three places

[modern seal]

i think this is a physics problem but cant find any solution

[wind meadow]

so for my 2D game, I want it to have an object be launched at an arc and have it land at a spot. I thought initially to have the two rigid bodies (with green being parented to red) launch at different forces with the green object being launched upwards only while the red object will have a force launched towards the spot.

But I realize that once the two rigid bodies are active, they do their own thing. What's a good way to execute this idea?

[errant gazelle]

Hi guys! I am making a car game (the car physics is inspired by this video: https://www.youtube.com/watch?v=LG1CtlFRmpU), and to move the car I apply a force with a forward direction to the car (which has a rigidbody with mass 1000) with Rigidbody.AddForce(force);.

Now the problem is the acceleration.. Because it's way too high, it goes from 0 to 100km/h in less than a second and it's not what I want in my game, but if I lower the amount of force, it also reduces drastically the max speed it can reach.. so how do I reduce the acceleration of the car without reducing its max speed?

And it also slows down way too fast (and I'm not applying any brake)

The deceleration is probably due to the drag.. but if I lower the drag, the car also starts to fluctuate much more

[uneven pine]

both objects need to land at the same place?

[wind meadow]

so kinda

so basically an object will be moving

and the child will move concurrently with it

once the object stops moving i want the other object to "land" on the end of the arc

actually yeah it's exactly that

[uneven pine]

with cars you have air drag and friction which makes the car not accelerate to infinity

read the paper from marco monster on wheel and car physics

[uneven pine]

why do they need to be parented?

[wind meadow]

it's more so they already were parented since other functions will need it.

[uneven pine]

(just the most basic forces in play)

[wind meadow]

so far for what i got @uneven pine when i did a jump function which did what i described. I had a transform position change per frame for movement on the parent but the child object can go up and down via rigidbody

[blazing cape]

ok, so I've been at this for a few hours and Im completely confused,.
I'm doing simple car movement and the wheels keep disconnecting from where they're supposed to be.
I've followed different tutorials on how wheelcolliders should work and scripted but I still have this reoccurring issue.
What would be the best fix for this? thank you

[uneven pine]

it might be because the wheel collider is inside the box collider but not sure

[blazing cape]

thats what I thought too, but it seems to have enough space for the wheel collider not to cause that to happen

[uneven pine]

I do not know why or what you really want tbh. its very weird. But you want one object to go on a straight line and one not so the one that is not you can just do with add force and the child which should go in a straight line you can just subtract its y positions or set the constraint that it can't move up and down

on the rb

[wind meadow]

yeah that might be what i'll have to do.

it's strange i know but it's because i'm trying to mimick a character being blown away

since when a person is launched it would be an arc and they'll eventually land till the friction slows down their sliding

[steep charm]

Does anybody know how to, not necessarily fix, but refine this phenomenon using the CharacterController? In game it make it looks strange. Would it come down to just blending the playermodel and hitbox to make it less noticeable?

Any help is appreciated

[uneven pine]

no idea what the problem is

[steep charm]

Oh no worries! I actually got the problem solved in another chatroom

[grim marten]

Hi! I'm pretty new to unity, and I'm trying to learn rigidbody/colliders.

I'm trying to get an imported 3rd party model to not fall through a floor, but it only seems to collide with a cube which has the same properties. Thanks in advance if anyone sees this!

[timid dove]

your collider is very thin

it will tunnel very easily

first off - try setting collision detection to continuous

[grim marten]

It worked- thank you so much! What's the difference between continuous and discrete Collision detection?

[timid dove]

This will explain everything:
https://gamedev.stackexchange.com/a/192403

[grim marten]

Thanks so much! ❤️

[iron lava]

Can someone please help me with the unity wheel collider?

I swear, it's working against me

No matter what I do, it either jitters, or shakes, or something!!

[iron lava]

Here's the stuff

I changed so much with it, but nothing works

[lofty tree]

Heya Physics readers!

Does anyone know of a Physics based editor placement tool similar to this that is free ? https://youtu.be/DQhxHJeCF4w

[stuck bay]

when adding an upwards force to an object with a rigidbody, instead of propelling it upwards properly, it pretty much just teleports it up, and then falls very very slowly

any idea why this might be?

this is the setup\btw I had to set the jump force that high so I could get the height I was looking for

[forest lance]

Maybe because your jump strength is 1000000

[stuck bay]

It happens with all values

It's just set to that so I can see it easily

[uneven pine]

does it with the move script deactivated the problem still ocour?

if not show us the code for the move script

[timid dove]

Sounds like your movement code is improperly setting the y velocity to 0 each frame

[stuck bay]

Also thought about it.. I'll check it out, thanks

[stuck bay]

I actually set the y velocity to 0

I changed it to just be the y velocity of the rigidbody but

(it's just 1 btw)

I think it has to do with this line cs UnityEngine.Vector3 move = new UnityEngine.Vector3(inputVector.x, rb.velocity.y, inputVector.y);
and this line cs rb.AddForce(move * Time.deltaTime * MoveSpeed * 10000); (specifically the multiplication part)

I made it multiply everything by 10000 so values like 1 would make a big difference

[stuck bay]

this is what happens after the jump btw

I'm tweaking things but no luck

if anyone knows what this is pls let me know

[timid dove]

You'd have to show your code and also your inspector

[stuck bay]

This is the entire code and the inspector

public class Move : MonoBehaviour
{
[SerializeField] private GameObject Visual;
private Animator animator;
private Rigidbody rb;
[SerializeField] private float MoveSpeed;
[SerializeField] private float jumpStrength;
 
 

 void Start()
 {
   rb = GetComponent<Rigidbody>();
   animator = Visual.GetComponent<Animator>();
 }
 
 
 void Update()
{
    UnityEngine.Vector2 inputVector = new UnityEngine.Vector2(0, 0); 
    
    if(Input.GetKey(KeyCode.W))
     {
       inputVector.y = +1;
       animator.SetBool("Walk", true);
     }

    if(Input.GetKey(KeyCode.A))
    {
      inputVector.x = -1;
      animator.SetBool("Walk", true);
    }

    if(Input.GetKey(KeyCode.S))
    {
      inputVector.y = -1;
      animator.SetBool("Walk", true);

    }

    if(Input.GetKey(KeyCode.D))
    {
      inputVector.x = +1;
      animator.SetBool("Walk", true);
    }

    
   if(true)
   {
     if(Input.GetKeyDown(KeyCode.Space))
    {
      rb.AddForce(UnityEngine.Vector3.up * jumpStrength, ForceMode.Impulse);
    }
   } 
    


    
    if(rb.velocity == new UnityEngine.Vector3(0, 0, 0))
    {
      animator.SetBool("Walk", false);
    }




    inputVector = inputVector.normalized;
    UnityEngine.Vector3 move = new UnityEngine.Vector3(inputVector.x, rb.velocity.y, inputVector.y);
    
    float rotateSpeed = 10f;
    rb.AddForce(move * Time.deltaTime * MoveSpeed * 5000);
    gameObject.transform.forward = UnityEngine.Vector3.Slerp(transform.forward, move, Time.deltaTime * rotateSpeed);
    rb.velocity = new UnityEngine.Vector3(0, 0, 0);
   
 }
}

the model is parented as just a visual so it shouldn't affect the logic

since it has no collision or anything

[timid dove]

Look at the last line of your code

[stuck bay]

wait

I don't even remember why that's there lmao

[timid dove]

^

[stuck bay]

yeah I noticed

I guess the flying off to infinity must've been the script setting the velocity while clearing it at the same time somehow\

this is probably why I did that

I'll try clearing everything but y

still flies off

and flips over

also are these speeds normal

it only goes crazy on the y axis so it has to have something to do with that

[timid dove]

this looks fine now

the tipping over you can fix by constraining the rotation

[stuck bay]

All axes are already constrained

And it shouldn't be so slippery

[timid dove]

UnityEngine.Vector3 move = new UnityEngine.Vector3(inputVector.x, rb.velocity.y, inputVector.y);
gameObject.transform.forward = UnityEngine.Vector3.Slerp(transform.forward, move, Time.deltaTime * rotateSpeed);

this is why it's tipping over

you're making it face the direction it's moving

including the vertical velocity

you should do:

if (inputVector != 0) {
  gameObject.transform.forward = UnityEngine.Vector3.Slerp(transform.forward, inputVector, Time.deltaTime * rotateSpeed);
}``` instead

also this:
rb.AddForce(move * Time.deltaTime * MoveSpeed * 5000); is wrong for two reasons:

• AddForce should never go in Update, it should go in FixedUpdate
• You should never multiply deltaTime into the AddForce call

[stuck bay]

Btw you can't do != With a vector and a number

[timid dove]

sorry:

if (inputVector.sqrMagnitude > 0) {
  gameObject.transform.forward = UnityEngine.Vector3.Slerp(transform.forward, inputVector, Time.deltaTime * rotateSpeed);
}```

i didn't get much sleep last night

[stuck bay]

Dw

Uh it says fixed update isn't called

[timid dove]

what says that

[stuck bay]

oh nvm it said that

it doesn't anymore

the console

it's even wonkier now

[timid dove]

show your code

[stuck bay]

   if(true)
   {
     if(Input.GetKeyDown(KeyCode.Space))
    {
      rb.AddForce(UnityEngine.Vector3.up * jumpStrength, ForceMode.Impulse);
    }
   } 
    


    
    if(rb.velocity == new UnityEngine.Vector3(0, 0, 0))
    {
      animator.SetBool("Walk", false);
    }




    inputVector = inputVector.normalized;
    UnityEngine.Vector3 move = new UnityEngine.Vector3(inputVector.x, rb.velocity.y, inputVector.y);
    
    float rotateSpeed = 10f;
    if(inputVector != new UnityEngine.Vector2(0, 0))
     {
       gameObject.transform.forward = UnityEngine.Vector3.Slerp(transform.forward, inputVector, Time.deltaTime * rotateSpeed);
     }

    rb.velocity = new Vector3(0, rb.velocity.y, 0);
 
  void FixedUpdate() 
  {
    rb.AddForce(move * moveSpeed * 5000);
  }
 
 }
}```

[timid dove]

you put FixedUpdate inside Update

don't do that

[stuck bay]

wait

o h I didn't notice

[timid dove]

also your AddForce should not be including the current y velocity of the object in the force you're adding...

[stuck bay]

wait

[timid dove]

also you'll need to make that variable into a member variable if you want to read it across different methods

[stuck bay]

oh I just missed the entire point of move

I forgot it adds 0 and doesn't set it to 0

Ok the jump works but I can't move and I still flip over

and fixed update seems to just not run

flipping over and everything is fixed

I just can't move now

ok clearly fixed update isn't running for some reason

but why

had to put it in regular update

but thanks anyways

[errant gazelle]

How does rigidbody.AddForce(force, ForceMode.Force) work under the hood? What's the formula used by the ForceMode.Force? Because I am trying to recreate it in unity ECS and I have seen on the Unity docs that the formula is mass*distance/time^2 but what is distance and where is the force vector?

I think that with distance they mean force, but I am not sure

[timid dove]

"distance" is not involved at all

the formula is:

Vector3 velocityChange = (force * Time.fixedDeltaTime) / rb.mass;```

not sure what distance would mean in this context, doesn't make sense

[errant gazelle]

Ok, in fact that formula seemed really weird (even the division by the square of time)

Thanks 😄

[timid dove]

I think you're looking at a gravitational force formula or something?

[errant gazelle]

I am making a car game and I am trying to add an acceleration to the car when the player presses W

But it should take in account the mass of the car

so yeah, that's the formula

Mmh.. and if I want to replicate AddForceAtPosition?

Because I think I should add a torque and lower the amount of velocity change to replicate that function, but I don't know the exact formula

[timid dove]

From the implementations I've seen the velocity change is the same but the torque is also added

I'm not sure how physically correct that is

but I think that's how it works normally

[errant gazelle]

Ah ok thanks.. now I just need to find out how the torque is applied

[timid dove]

i mean it's a similar formula

just replace mass with inertia tensor

[errant gazelle]

mmh.. it's the first time I hear about inertia tensor, hope it's easy to retrieve 😆

[fiery ruin]

Hi everyone
I want to add a force through parent prospective

// This script attach to child object
If(tr)
rb.addforce(vector3.forward)

This move through child transform protective.
How can I add force in child object through parent transform?

Anyone please

[timid dove]

Rigidbody AddForce always adds forces in world space.

Convert any force vector you have to world space, then apply the force

[fiery ruin]

How?
Can you explain me please

[timid dove]

Use Transform.TransformDirection to convert vectors from local space to world space if needed

[uneven pine]

transform.TransformVector

[timid dove]

That one's affected by scale which is probably not desired

[uneven pine]

I know which makes it desired

[gaunt walrus]

So my character controller just randomly moves up and down small amounts when colliding with other stuff, is there a way to lock movement along the y axis

[bleak umbra]

FixedUpdate() => rigidbody.velocity = new Vector3(rigidbody.velocity.x, lockMe, rigidbody.velocity.z);

[uneven pine]

I would not use unitys default character controller because it only really works properly under perfect condisions

[timid dove]

well in general if your objects are moving too fast and your colliders are too thin, you may encounter tunneling.

Another thing that might be biting you is if you are moving some objects in Update, the collider positions won't actually update until the next physics update (which happens right after FixedUpdate)

I don't know the specifics of what you're doing enough to say what your issue is but it might involve one or both of these issues.

[timid dove]

FixedUpdate will do that

FixedUpdate is guaranteed to run between every physics simulation frame

as long as your ray is at least as long as your object will move in one physics frame (velocity.magnitude * Time.fixedDeltaTime) then you won't miss anything

[timid dove]

i'm not sure I understand what's happening here. So this is like, you just move your mouse and if you touch an obstacle you lose? It looks like you're only doing a raycast from your screen to where the mouse is

I'd expect that you'd want to do a raycast from the previous mouse world position to the new mouse world position

and if you detect a hit there, then you've hit an obstacle

that would prevent the player from simply moving the mouse very quickly across obstaces

[glossy barn]

Hello, does anyone know how to fix this please ? I can't find any tutorial for this (I'm new to Unity)

Player goes through the wall and then slowly goes on top of it

[glossy barn]

I haven't used any code for it, I only used Colliders

[timid dove]

I mean

the fact your character is moving means you wrote code

or at least

copied it

anyway it looks like your character is not moving in a physics-friendly way

you'll need to change that

[glossy barn]

I meant for the gravity, I used InputSystem for the player and a bit of script

[timid dove]

move either with a Rigidbody or a CharacterController to get collisions etc. to work properly

[glossy barn]

ok I'll try this out, thanks

[autumn jetty]

Trying to setup to make a joystick. When dealing with configurable joint, it seems to not rotate around anchor point? What am I missing here?
I freezed the rigidbody position instead of only the joint 🙃

[deft orbit]

I have a large GameObject with 20-something mesh colliders attached, and it eats performance for breakfast (4 of these objects result in roughly 75 fps of lag) and it also produces the weirdest bug I've ever seen.

What can I do to resolve this? Will it help if I put the colliders on child objects?

[timid dove]

simplify your collider(s) situation

lower detail meshes and/or replace the mesh colliders with primitives

[deft orbit]

Is there nothing else I can do? The mesh I'm trying to create colliders for can't really be simplified, and unless I've been severely misinformed there's no other way to do this since it's a concave mesh

[timid dove]

concave mesh colliders can be replaced by multiple primitives

for example a concave mesh collider for a room would be 6 box colliders representing hte floor, ceiling, and 4 walls

[deft orbit]

I'm well aware of that, but I can't simplify any further
My object is a 1:1-scale Star Destroyer, which has both non-trivial surface details and shapes that can't really be replicated with primitives

[uneven pine]

you can also split up the model into multiple peaces so you can use primitive colliders instead

[uneven pine]

maybe you could also make it that not all colliders are active but only the once near the player

but there is no magical button that will fix all your problems

[deft orbit]

No, I can't unfortunately. The shapes that comprise a Star Destroyer make approximation on the desired scale practically impossible.
For example, just take the basic wedge shape. You can't reach a good approximation on the scale I'm looking for without using mesh colliders.

Interestingly, it seems the problem isn't actually the colliders. After some trial and error I disabled all the colliders, and my performance barely recovered and the bug is still there. Which means I get to go on a bughunt again.

[upbeat dirge]

hi guys, is there any guide to setup mass in your project?
Example I have a crate I have to set mass to 300, so it feel like a crate.
If its mass is 1, when character just touch it a little it fly away, feel no heavy at all.
But then, when it mass is at 300, I have to apply 3000 force on an attack to really push it.
That's all fine until I have my auto setup ragdoll, which all rigidbodies all has mass range from 1-3.
And you guess that, when the ragdoll hit with 3000 force, it flies like a rocket 😂

the limbs can't have too much mass like 100, when I set it like that they will behave weird.
So my final decision is to have limbs have a component with float forceMult to make the 3000 force become 3.
Is there more elegant way to overcome this dilemma?

[timid dove]

If you want realism, apply realistics masses and forces

a crate of that size might weight somewhere between 3-50 kg depending on what's inside it

as for the forces, make sure you're using the correct ForceMode

If you are doing an attack that force should generally be an Impulse force

if you're applying 3000 force you are likely using the wrong ForceMode

[upbeat dirge]

hi bro thanks for rep
I don't want realism, just want it feel right.
And when my character just move against the crate and it move too much then it surely not right.

and I just checked the force, is Impulse.

wait let me record when it is mass 1

it fly like cardboard box

what mass should I apply?

[upbeat dirge]

Decided to make crates mass at 100
force 200 (which sends human ragdoll flying at good speed)
crates has component receivedForceMult = 4
so crates will receive that force at 800 to move reasonably.

[timid dove]

Depends how fast and small the things interacting with it will be

[upbeat dirge]

dont go with such low width, 0.5 is ok, if it stick out too much you use offset to move it back, but dont go low width, objects will fly through at high speed

[wooden plaza]

why is my player phasing through the elevator like that when it falls? You can see in the first clip how it glitches and phases through and in the second clip the elevator falling down normally. I would like to have it so the player enters the elevator and it falls with the player still in the elevator... how can I make this happen?

[timid dove]

WHy does your character have both CharacterController and Rigidbody?

those are two competing movement strategies

they are not going to play nicely together

and it will not interact nicely with the environment (as you are seeing)

[inner birch]

Hi all, do you know other system to simulate submerged ship like: https://assetstore.unity.com/packages/tools/physics/dynamic-water-physics-2-147990
I don't know of other systems to manage the interaction of the vessel with various water systems and the related physics. I am wrong? Especially with regards to submarines.

[wooden plaza]

Thanks for the response, I will change this and report back.

[crude trellis]

noob question. how do i create my 3d models solid in unity? (if i play in fps, the player wont go through the mesh).

tried adding component rigid body but it does nothing

also checked the kinematic

[autumn jetty]

    private void RotateToTarget(Vector3 targetForward)
    {
        var targetRotation = Quaternion.LookRotation(targetForward, Vector3.up);
        var rotationDelta = targetRotation * Quaternion.Inverse(transform.rotation);
        rotationDelta.ToAngleAxis(out var angleDelta, out var axis);

        var angularSpeed = (Mathf.Deg2Rad * angleDelta) / Time.fixedDeltaTime;
        rigidbody.angularVelocity = angularSpeed * axis;
    }

Why does this code not result in an instant turn to the target rotation, but does it over multiple frames?

[timid dove]

You converted it to radians

angular velocity uses degrees

[autumn jetty]

Says radians? https://docs.unity3d.com/ScriptReference/Rigidbody-angularVelocity.html

[timid dove]

Anyway why not just use MoveRotation?

[timid dove]

Hmmm so it does 🤔

[timid dove]

How many frames are we talking

Could it just be interpolation in action?

[autumn jetty]

Like a second

[autumn jetty]

This does the job, but now I'm more intrigued of why the other doesn't.

[wooden plaza]

@timid dove Removed the rigidbody component from my player and still getting this...

[timid dove]

What is supposed to be happening

a normal smooth elevator?

[wooden plaza]

The player stays in the elevator lol

Noooo

[timid dove]

Or are you trying to do some kind of crashing elevator thing

[wooden plaza]

the elevator is meant to fall

[wooden plaza]

yes

[timid dove]

well it looks like you're kinda... teleporting the elevator

[wooden plaza]

nope

[timid dove]

inthe first frame of the failure

[wooden plaza]

it falls

using gravity

i will show you

[timid dove]

the thing is CharacterController is not amazing when it comes to physics realism

it only moves when you call Move

so if your elevator starts falling it's easy for it to get janky

Probably better off with a Rigidbody character

[wooden plaza]

the player is obviously meant to be in the elevator when it falls and they should stay in it not phase out of it

what if i disable the character controller when i enter the elevator and enable rigidbody?

@timid dove

[wooden plaza]

fixed

[hardy moth]

Hello everyone !
I have a question about colliders, is it the correct channel ?

[uneven pine]

sure

[hardy moth]

I ended up asking in #archived-code-general but do not have an answer yet

(it's the last message there, it's pretty quiet right now)

[autumn jetty]

In case you're interested, I looked at it today again. And there's a rigidbody.maxAngularVelocity which limited how fast it could rotate.

[timid dove]

ah yes, forgot about this

[light hound]

Not sure if this goes here, or in #🏃┃animation . But, I took this model into blender, and added bones all along the cable and the phone receiver. How can I make it to where if I pick up the phone reciever, and drop it, that gravity pulls the cord tight?

[calm raft]

so.. the docs say

Notes: SphereCast will not detect colliders for which the sphere overlaps the collider

yet, my tests all say it will detect colliders it overlaps (from the starting point of the ray) - what's going on here? Is the manual wrong?

[versed lodge]

Anyone know why this jittery movement along a spline might be happening, in this clip? maybe gravity and a model with poor import scaling?

[rich totem]

hi, first time doing a first person shooter. Got stuck in this bug. When itry to jump on something my character will start to move away without touching anything

[woeful pulsar]

People who have spent time developing physic based ropes compatible with unity's physics, what approach yielded the best results?

[bold python]

Hi, my Rigidbody Player is sliding slowly down slopes, the terrain already has a physics material with high friction and the rigidbody has some drag too but the player is still sliding. Is there a way to have the player be completely still?

[timid dove]

Buying Obi Rope

[woeful pulsar]

@timid dove Thanks -- yeah it's a strong solution. I was hoping for a workaround because I'm a bit annoyed about the obi aspect of having to put their custom components on most of the stuff that'll interract with obi

[silent mural]

looks like it might not have any friction so it slides forever, like on ice?

[silent mural]

are you teleporting it in Update() maybe?

[whole mesa]

There are some Problems with the Raycast, it is flickering rapidly sometimes, or a little. Anyone knows a fix for the Raycast? It is sometimes changing to Ground, even the player is looking at the item

    {
        if (Physics.Raycast(transform.position, transform.forward, out var hit, Mathf.Infinity, mask))
        {
            obj = hit.collider.gameObject;

            if(obj.tag == "Item")
            {
                tsf.localScale = new Vector3((float)1.7917, (float)1.017622, (float)0.002059521);
                tsf.localPosition = obg.localPosition + new Vector3(0, (float)0.5, 0);

                tablet.transform.rotation = Quaternion.LookRotation(Camera.main.transform.forward, Camera.main.transform.up);

            }
            else if(obj.tag != "Item")
            {
                tsf.localScale = new Vector3(0,0,0);
            }
        }
    }```

The flickering is not always happening. The FixedUpdate made it less but not gone

[timid dove]

What object is this script attached to

[whole mesa]

Main Camera

[timid dove]

And the player moves how? Rigidbody?

Your player may simply be moving very slowly and therefore the Raycast position is changing constantly

If you're near the edge of an object this could mean hitting/missing it

Likewise you seem to have some kind of idle/breathing animation on the player too? That could also be shifting the camera slightly

[whole mesa]

This is the Simple Movement script:

        move_Direction = transform.TransformDirection(move_Direction);
        move_Direction *= speed * Time.deltaTime;

        character_Controller.Move(move_Direction);```
The player has an attached Rigidbody, but the rotations are freezed, so it doesn't fall down.

[timid dove]

you should absolutely not be using CharacterController and Rigidbody at the same time.

[whole mesa]

I tried out to play in the Build version, there it only flicks when the player is moving that is true

[timid dove]

that could definitely lead to weirdness like you're seeing

[whole mesa]

That is on a different camera and object the animation

[whole mesa]

ngl, but that is the case

now it doesn't flick at all

thanks for the solution

[frigid pier]

@wispy zinc #854851968446365696 how to ask questions.

[shut coral]

I'm creating a Breakout game. I have a ball with a Rigidbody 2D with a "Bouncy" Physics Material 2D (Friction 0, Bounciness 1). My paddle has a Rigidbody2D with no physics material. Input applies a force on the paddle rigidbody. The paddle's position is frozen in the Y axis and the rotation frozen in the Z axis. For some reason, my ball loses velocity on contact with the paddle. I have tried applying the Bouncy material to the paddle with no effect. Any idea why?

[shut coral]

This hacky bit fixed it:

private void FixedUpdate()
{
    rigidbody.velocity = rigidbody.velocity.normalized * speed;
}

[supple hill]

Hi guys, having a problem getting my car after turn to return to its original facing direction. Im making a game where you are on a highway and only turning left and right. What i want to achieve is when i stop pressing left or right, vehicle would return to facing forward. Any ideas how to do that? im using wheel colliders to turn, not rotation.

[storm shuttle]

{

    public Quaternion leftRotation = Quaternion.LookRotation(0,-45,0);
    public Quaternion forwardRotation = Quaternion.LookRotation(0,0,0);
    public Quaternion rightRotation = Quaternion.LookRotation(0,45,0);
   
    private void Update()
    {
        switch(transform.rotation)
        {
            case forwardRotation:
                if(Input.GetKey(KeyCode.L))
                {
                    transform.rotation = leftRotation;
                }
                if(Input.GetKey(KeyCode.R))
                {
                    transform.rotation = rightRotation;
                }
                
                break;
            case leftRotation:
                if(Input.GetKey(KeyCode.F))
                {
                    transform.rotation = forwardRotation;
                }
            
                break;
            case CarStates.RIGHT:
              
                if(Input.GetKey(KeyCode.F))
                {
                    transform.rotation = forwardRotation;

;
                }
                break;

        }
    }
}``` Try using FSMs?

[supple hill]

i got around my problem by using addForce which works pretty well

but thank you, ill try your version as well

[rapid trellis]

For some reason I'm having weird collisions happen between my player and the ground where it will randomly have a collision detection facing the left normal and will quickly go away if i press left for a bit and then right to advance past it

[clear wraith]

Hi! im having a weird glitch with my rigidBody 2d and edge collider
does anyone know why?
(sorry for the noise)

jesus that noise is way louder than i thought sorry haha

[tropic trench]

What are you recording with?

[timid dove]

Use PolygonCollider2D not edge collider for that

[clear wraith]

gotcha thanks!

[clear wraith]

nvdia shadow play

[tropic trench]

Maybe try obs or find a setting in shadowplay to disable sound

[bold python]

is there a way to affect a rigidbody with forces but not affect a child of that rigidbody with its own rigidbody with those forces?

[timid dove]

Dynamic Rigidbodies that are children of other objects generally don't respect the Transform hierarchy

they'll just move according to physics

but - it's kind of discouraged to have parent/child relationships between dynamic bodies in general

[bold python]

Alright, thanks for the answer, I think I can find another way to make my game work

[carmine fjord]

Hi, I'm making a simple golf game in Unity 3D and my ball does not bounce off walls correctly. My walls are made from prefabs (I'm using the gameobject brush with a tileset) with box colliders. Half the time I have my ball go towards a wall it doesn't bounce correctly, half the time it bounces back at where it came (while shooting it at a 45deg angle and a top wall) the other half it bounces correctly. Btw I'm using a physics material to get the ball to bounce. Any help?

[unique cave]

Most likely the ball is hitting the box collider at the edge and hitting the side of the block thats in reality inside the wall. Using mesh collider would be better idea than multiple box colliders. This is well know bug thats pretty hard to solve

[carmine fjord]

Thank you for responding, but since I’m placing each prefab with a tile map how can I turn it all into one mesh?

[uneven pine]

https://docs.unity3d.com/ScriptReference/Mesh.CombineMeshes.html

[uneven pine]

this should help

[unique cave]

eh... I'm not that sure it will, if you don't remove the faces inside the walls, it may not help at all

[uneven pine]

oh yeah right...

[fiery ruin]

Hi everybody
How can I use rigid body forces with animation?
when I am use Addforce and in next line I am true the animation..
The problem is the when animation start they skip the force

[timid dove]

Follow the cardinal rule of animator:

• don't animate the root object position
• animate child object positions

In short

• put the character model/sprite/etc on a child object and animate that
• The root object should have the Rigidbody and move

[fiery ruin]

Thankx

[solid spoke]

Hello! I'm not sure if this is the correct thread to ask this in but I am struggling to figure out what constraints I should use on my rig (Inverse Kinematics)

So, what I have now is an armature with the root bone in the middle, and spreading out to 8 other bones which contain the simple humanoid structure. What I want is, based on the rotation of the root bone, I want the humanoids height to change [ex. Crouch down when the root bone is titled towards them etc.. ]. I was able to achieve this in blender using basic IK but I can't seem to achieve this is Unity.

So, what would be the best way to approach this problem? Using multiple rig components with multiple constraints? Joints?

Any help would be appreciated, and sorry if I have posted this in the wrong thread! Thank you.

This is ideally what I want to achieve in Unity: https://www.youtube.com/watch?v=mFVb64OS9jE&ab_channel=Earthpix

[timid dove]

I would have each humanoid rooted at the ground and the point they are touching on the disc would be the IK target/effector or whatnot

then you just move/rotate the disc as you please and the humanoids will follow

This is kind of an #🏃┃animation thing not physics thou

[solid spoke]

thanks for the feedback

sorry about that

[solid spoke]

what IK would I use?

[carmine fjord]

Any luck figuring something out?

[barren charm]

Is this a good place to ask a difficult game dev Math question?

[tiny fog]

worth a shot

[barren charm]

So its kinda complicated, but bare with me. I'm making a VR game were the player can move this object by moving their hand. Target objects will accelerate towards the velocity of the players hand.

Example: With a object starting at 0mph and the player's hand moving at 5mph the object will accelerate from 0mph to 5mph at a rate of 1mph^2

Simple enough right? But I have a problem. I want the acceleration to be faster the closer the two speeds are.

So for Example: With a object starting at 0mph and the player's hand moving at 2.5mph the object will accelerate from 0mph to 2.5mph at a rate of 2mph^2 instead of 1mph^2, since the velocities are closer.

My problem is anyway I can Think of doing this would make the acceleration be effected by frame rate. A higher frame rate would cause acceleration would accelerate faster. Like calculating 10% interest yearly vs 5% interest biannually. Does anyone know a way I can do this without locking the calculation to the frame rate?

[tiny fog]

I'd probably start with graphing the kind of curve I wanted and scaling the acceleration by t where t is the normalized linear interpolated distance between start and end position

and if you want a curve with a difference shape, you just make it parametric in t and scale by that

[barren charm]

I have get what your saying. But I'm not sure how to use it to solve my problem 😭

This is the type of sudo code/equation I was thinking

HandV = Hand Velocity
ObjV = The velocity of the object being accelerated
T = Time
A = acceleration
AScale = Constant representing the scale of the acceleration
NewV = The new Velocity of the accelerating object

//the bigger the difference in handV and ObjV the less the acceleration
A = AScale /Clamp(abs(HandV-ObjV), 1, 10)
NewV = T*A + ObjV

But if for 8 seconds, at a scale of 4, while you move you hand at 10 velocity, and the object starts at rest. You get a new velocity of 3.2

But the problem is if you double the frame rate, so you do the equation twice with 4 seconds each you get a new Velocity of 1.6 then a new velocity of 3.5. Since 1.6 is closer to 10, so it accelerates more the second time.

[barren charm]

I'm kind of tempted to just force it to update in consistent .01 second intervals

[timid dove]

This is exactly what FixedUpdate is for

This is the problem FixedUpdate solves

[timid dove]

Yes, by putting it in FixedUpdate 😜

[barren charm]

Oh I thought fixed update just happened more often, didn't know it had a set tickrate

[timid dove]

It's called fixed for a reason

By default it actually happens less often than a typical framerate

Fixed time default is 50 times per second and typical framerate targets are 60+ fps

[barren charm]

Yeah now that you say that it makes a lot of since 😅

[karmic magnet]

Quick question about creating a new scene for a physics simulation - objects in a simulation scene don't interact with objects in the 'real' scene do they?

also - if I set the active scene to my physics scene, then instantiate an object but parent it to an object in my 'live' scene, does that pull that instantiation back into my live scene?

[timid dove]

• Separate physics scenes are separate. Objects in one physics scene cannot interact with objects in another
• Instantiate always creates an object in the Active scene, however setting an object as a child of an object moves the child into the scene of the new parent.

[karmic magnet]

Word. Was having an issue where I was spawing my objects (dice) into the new scene but getting non-deterministic results. Eventually I figured out the dice were being spawned into the same point and bumping into each other, changing their results.

[tired dagger]

Hello
i dont know if this is the correct place to ask but i will ask it anyways
i am having a weird glitch where the player is moving very slow towards the ground

i have gravity set to 1 which should work normally but he moves very slow

my other projects work fine with 1 gravity just not this one

[timid dove]

it's because of your movement script(s)

[tired dagger]

i have a simple movement script with rigid body velocity

so what i do is i check keycode and set vector2 direction and then in a fixedupdate i set the player velocity

and multiply is by a fixed movespeed

https://pastebin.com/QdQhhAdh

[timid dove]

yes exactly

this is why you fall so slowly

You are setting y velocity to 0 each fixedupdate

[tired dagger]

oh i see

what can i do then

[timid dove]

moveDirection = Vector2.right;
oveDirection = Vector2.zero;

y value of these is 0

[timid dove]

preserve the y velocity

[tired dagger]

okay i see let me try it out

okay i have a small fix for it
I made the else vector2.down but thats not a permanent fix so can you tell me where i can start so i can do it on my own

it feels weird

or should i just use AddForce ?

[timid dove]

you're overcomplicating it

moveDirection = new Vector2(1, Player.velocity.y);``` for example

this sets the x velocity to 1 while preserving the existing y velocity

[tired dagger]

oh

i see now

so i can just change the xvalue of it because that is i need mostly

thanks that makes more sense now

[barren charm]

If I have a Rigidbody on a object and a collider on its child object, can it be hit by raycasts?

[unique cave]

Raycast detects colliders, nothing to do with rigidbodies, so yes

[barren charm]

Augh I can't for the life of me figure out why my raycast can hit everything expect the thing I want it to hit

I've got this pause menu that pop's up. The resume button's box has a collider. and this is my raycast code
`RaycastHit hit;
Ray ray = new Ray(transform.position, transform.forward);
if (Physics.Raycast(ray.origin, ray.direction, out hit, 100))
{

        Scr_UIButton newHit = hit.transform.gameObject.GetComponent<Scr_UIButton>();

        targetUIButton = null;

        if (newHit != null)
        {
            //DEBUGGING
            Debug.Log("Pause Raycast Hit!!!");

            targetUIButton = newHit;
            targetUIButton.Highlight();
        }
        else
        {
            //DEBUGGING
            Debug.Log("Hit But not a button: " + hit.transform.gameObject);
        }

    }
    else
    {
        targetUIButton = null;
    }`

I can get every thing in this since to get hit by the raycast, in the debug log, expect the resume button 😭

[barren charm]

nvm it might be working?

Okay weight the problem is weirder than I thought. When I pause the timescale is set to 0, and the menu is activated and moved in front of the player.
The problem is the collider seems to be in the last place the pause menu was and not in the current place the pause menu is?

I solved it out I had to call Physics.SyncTransforms() once after pausing the game

[foggy condor]

what y'all think the realistic gravity value is in physics gravity

the default is -9.81

[barren charm]

-9.81 realistic if you have your assets set so 1 unity unit is equal to 1 meter

[foggy condor]

how do I do that?

[keen harness]

set the gravity to that number

[barren charm]

Its kind a something you have to manually do by eye. The way I do that is I put a default cube in my seen. Default cubes are 1 unity by 1 unity. I drag it next to things and see if they are the right size.
For example: If I have a person in my scene, and wanted to make sure they were the right size I would, Make cube. Then would give the cube 1.77 scaling so the cube should be 1.77 meters tall.(the average adult is 1.77 meters tall) I would then move next the person in my scene to see if they are about the same height

TLDR: if your person is the size of Godzilla its gonna look like they are falling very slowly because cause their so big -9.81 doesn't seem like much.

[foggy condor]

so if an object is falling slowly it should be smaller?

[barren charm]

yeah, if you want to keep gravity realistic

Maybe a simpler way of putting it is. You're gonna want to make a meter that's 1 unit tall, then start measuring things to make sure they're a realistic size

at least for important things like player characters

[foggy condor]

what is 1 unit

do you mean the y scale 1?

[barren charm]

It depends on the model. When the default cubes 1 unit tall so at a scale of 1 they are 1 meter tall. But other model might be taller or shorter.

[foggy condor]

what unit is the capsule default size

it's probably 2 isn't it?

so for realistic gravity fall I need 1 unit character size?

[barren charm]

yeah i think so

its somewhere between 1 and 2. Like an adult would be 1.7, a child might be 1, and tall adult could be 2

[foggy condor]

or as you said 1.77

ok

yeah it's the same thing

even if I made it smaller

probably the best way to do this is just increase the gravity it self in the settings

[keen harness]

So i'm trying to do blended ragdolls, but for some reason they always fall straight down no matter what

https://pastebin.com/wdTzxxxH

basically blended ragdolls are when the animation ends it becomes a ragdoll

anyone know how to make it so the ragdoll continues the direction it was launched during the animation?

[boreal stirrup]

Hey guys, i might just be really stupid, but fixed joints bend for no reason
tried a few common solutions i found online like adding multiple joints to the same connection, but even with 30-50 joints it still bends, even tried enabling self collision so the colliders will prevent the blending, but it still bends

Is there a way to fix this, or is this just how fixed joints work?

[viral ginkgo]

what do you want to do with this?

there isn't a good solution to prevent this bend if you use any sort of joints

and if you don't want it to bend, maybe you don't want to use joints

[boreal stirrup]

yeah, i just found out from a friend that objects parented under an object with a rigidbody also count into the physics (idk how i never found this out myself before), didn't implement it yet but it should all be sorted
thanks for trying to help out

[viral ginkgo]

I see, I was going to suggest that if you said you didn't like it bendy

[viral ginkgo]

You probably have a Vector3 for the direction you want ragdoll to go
That could maybe be the impact force of the projectile that killed the player
Or the players last movement direction or its velocity

You can just apply something like an explosion force to the ragdoll limbs using that
Or set all the limbs velocities to that

After disabling the animator and putting your character into ragdoll mode however you're doing it

[chrome cradle]

Hey,

Why does this code not make a ballistic curve?

private Vector3 Plot(Vector3 lastPosition, float delta)
{
  velocity.x -= exitVelocity * drag * delta;
  velocity.y += -gravity * delta;
  velocity.z -= exitVelocity * drag * delta;
            
  velocity.x = Mathf.Clamp(velocity.x, 0, exitVelocity);
  velocity.y = Mathf.Clamp(velocity.y, -54, exitVelocity);
  velocity.z = Mathf.Clamp(velocity.z, 0, exitVelocity);
            
  Vector3 newPosition = lastPosition + velocity;
  return newPosition;
}

private List<Vector3> Simulate(float seconds)
{
  // Simulates a ballistic curve in a given time
  List<Vector3> plotPoints = new List<Vector3>();
  float t = 0;
            
  Vector3 newPosition = origin;
  plotPoints.Add(newPosition);
            
  while (t < seconds)
  {
    newPosition = Plot(newPosition, 1);
    plotPoints.Add(newPosition);
    t += 1;
  }

  return plotPoints;
}

private void Draw()
{
  velocity = Vector3.one * exitVelocity;
  direction = transform.forward;
  origin = transform.position;

  List<Vector3> plotPoints = Simulate(100);
  Drawing.Singleton.Plot(origin, plotPoints)
}

velocity = 345, 345, 345
drag = 0.05

[silent mural]

are you aware that you have sideeffects changing the Vector3 velocity in the Plot() Method? is that indended?

dont do it incrementally with sideeffects. make a parameterized curve:
a formula for x, for y and for z that depend on t.
then calculate the point for t.

s_x(t) = startPos.x + exitVel.x * t  //linear velocity
s_y(t) = startPos.y + gravity * t*t * 0.5 //acceleartion downwards
s_z(t) = startPos.z + exitVel.z * t //linear vel

you can also do it with vectors:
Vector pos_t = startPos + exitVel * t + 0.5*gravity * t*t
where gravity = (0,-9.81,0)

if you want drag to reduce the velocity, you can calculate exitVel for t too

[deep parrot]

Hello!
so ive got a problem with a rigidbody and how it is continuously bumping and skipping across the surface (video attached)
i feel like the problem has to do with the track mesh being an array of cubes onto a curve (you might be able to see on the video) because every time the player trips, its on one of the edges but i would prefer to keep that if possible because i dont want to end having a large mesh just for the track
i have also tested with a capsule collider and same thing happens
rigidbody and collider settings at the end as well
thanks for any help!

[misty wyvern]

Hey, I'm working on a game with big physics simulations, and I just found out about Physics scenes, and I was wondering: are they multithreaded or they all being run on the main thread?

I haven't found anything mentioning that in docs

[raven leaf]

whats wrong with wheel colliders

every month i give up because of this problem

Am i doing stuff wrong

[bleak umbra]

Your scale on the wheel is 100, set it to 1, fix the other values on the collider accordingly

[errant moss]

Can someone help me understand what AddForce does?
In the case of force mode, how is the duration the force is applied over determined? I don't see an AddForce overload with a time parameter
In the case of impulse mode, what does applying a force instantly mean? If I have a 1kg object and I apply 1 (unit of?) force instantly, what will be the resulting speed of the object?

[hollow timber]

so im not that good with physics but the the main difference between Force and Impulse is that:

Force moves the object like it wants to move by itself (like a human walking. We have mass so we cant instantly start walking so it takes some time and force to speed up. This means that some of the force will be used over time to accelerate the object and how much depends on mass)

Impulse moves the object like it got hit by a hammer (like a tennis ball being hit by a racket. You cant really have the ball slowly accelerate because then it will clip into the racket so it "inherits" the velocity)

But again this is kind of head cannon to me so take it with a huge grain of salt

[errant moss]

hey thanks for the reply, but I did end up figuring it out

the documentation for rigidbody (not rigidbody2d) explains the different modes correctly

for force mode, the engine accelerates the object as if applying the force over a time equal to fixedDeltaTime

and for impulse it accelerates it as if applying the force over 1 sec

[hollow timber]

damn

didnt know that

[stuck bay]

How to do smoke physics? Basically a collider that spread like smoke, then when it hit something damage it?

[neat hinge]

Why wont my generated mesh collider show up unless I check Convex?

[uneven pine]

because it just doesn't

thats not a bug

[gaunt walrus]

Kinda late but figured it out, apparently not having the rigidbody at (0,0,0) does this

[unique cave]

Does it matter? It not showing in inspector does not mean its not working

[unique cave]

Theres no such feature on unity/physx. You could make sphere collider or use Physics.CheckSphere and expand the radius every frame

[neat hinge]

I figured that out eventually. The issue is with rigidbodied

How can I simulate a ball over a complex mesh then?

[unique cave]

What you mean by that?

[neat hinge]

I have a model I made using blender

It’s a ball tilt game

So the model represents the level, it has pits, walls and such

I thought I could just set the mesh to collide

But apparently not

And of course a convex mesh would make any pit not work

[unique cave]

As I said, even though non convex mesh colliders are not visible in the inspector, they work just fine so what is the problem?

[neat hinge]

The ball just falls through it 😂

[unique cave]

Is the object having the mesh collider set to non kinematic?

[neat hinge]

The rigidbody? Yes, the is kinematic is unchecked

[neat hinge]

Should this be checked? Even when the convex works (kinda) when it isn’t?

[unique cave]

In case you want the object to be dynamic, non convex mesh colliders will not work. You should use compound collider instead

[neat hinge]

The level is non dynamic

[unique cave]

Why it has rigidbody then?

[neat hinge]

So that the ball collides with it?

[unique cave]

Collider does that, rigidbody is useless for static objects

[safe flare]

How would I be able to get collider to be affected by rigid bodies but also have a hole in it? Apparently I'm not supposed to use multiple of the same type of collider on a single game object, so I can't just add 4 mesh colliders that are convex around the hole.

[unique cave]

You can add those colliders to the child objects of the rogodbody

[safe flare]

so i need to create 3 child objects just to hold the colliders?

will that still call OnCollisionEnter in the parent?

[unique cave]

@safe flare yes and yes

[uneven pine]

If you want to use a non convex mesh collider you need a rigidbody for it

[unique cave]

you absolutely don't

[uneven pine]

pretty sure you do

I can test it out later, but pretty sure

[unique cave]

I'm 100% sure you don't. even the default unity plane has mesh collider (which is non convex) and no rigidbody, still other objects can collider with it without any problems (just tested to make sure)

[uneven pine]

I'll test it

[topaz dock]

I don't know what I did that now my character goes through all the objects that he finds and falls to infinity, and before he did collide

[digital flax]

Hey guys i got this weird bug no idea how it works I'm pressing the same button's every time i just change speed from 60 to 400 and it suddenly works

[timid dove]

are we supposed to know what's going on in this video?

[digital flax]

sorry i could have asked better i was moving left and right anyway i fixed it

[fierce depot]

Hello, Just a quick question, Is it possible to Add Box Colliders To a cloth component, because i can only see Capsule and Sphere
Thanks ^^

[timid dove]

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

Additionally, you can only use three types of colliders with cloth: a sphere, a capsule, and conical capsule colliders, constructed using two sphere colliders. These restrictions all exist to help boost performance.

[fierce depot]

ok ok thanks

[civic tiger]

Is there a way to get a child Prefab to stay in the same position of a parent bone in an armature?

[civic tiger]

For example, I've created a boss enemy that has a prefab called 'Pinchers' on his body bone

[timid dove]

child objects always follow parent objects

[calm badger]

Hello there.
I have a movement system for my player, some collisions and rigid bodies as well. The problem is seen in the video. Sometimes, the player just doesn't collide with the border (FitToThis game object). Any posible solution?

rb of the player

fit to this (border) components

[timid dove]

How are you actually moving the player

[willow fog]

Can we have two colliders of same type on single dynamic rigidbody Object?

Example: 2D character has two capsule colliders of different height 1) Stand 2) Crouch

[timid dove]

sure why not

might be simpler to just change the height/position of a single collider though

[willow fog]

Centre remains same, that's the issue to move the size=1 slider I need to also change the y offset along with

[timid dove]

you can change both things

they are both propertes on the capsule collider

[willow fog]

yea right, is there any possibility, that while suddenly moving offset it can pass through or stuck in ground collider??

[timid dove]

yes, you need to make sure you don't move the collider inside of things

when shrinking it (crouching), it should be fine as long as the new smaller one is completely inside where the bigger one was

for uncrouching, it's common to do a CapsuleCast to make sure you have enough clearance to "stand up" again

[willow fog]

If the offset is completely inside the limits of bigger one, can there be any chance of accidently moving it inside any other collider?

[timid dove]

Of course not

assuming the bigger one is not already overlapping anything

[willow fog]

Yea thanks, still I don't wanna take risk

I think first turn on crouch collider and then turn off standing one and vice versa\

[timid dove]

how does that change anything

you still have the same risks

[willow fog]

I read on many places that don't use same type of multiple colliders on one game object, that;s why I was curious why so

[timid dove]

unless you do capsulecasting for standing up

[willow fog]

Yea agree, that's I am already doing, I was more concerned on crouching part

[willow fog]

In Unity, colliders are immutable behind the scene, so whichever approach you follow in both case colliders are recreated

[calm badger]

with a swipe movement system I found online. I don't think thats the problem actually

[timid dove]

Not really what I'm asking

More like

Are you moving in a physics aware way

Or just teleporting via the transform

And it's almost definitely related

[night flame]

my trajectory works with a circlecast sent over a linerenderer, but, as you can see from the video, the trajectory stops where it shouldnt, since when you throw the ball, the ball goes through. I know this depends on the radius of the circlecast, and i've been tweaking numbers for hours trying to get to a point where it's perfect, but in some places it's too small and in some places it's too big. Is it because i'm using a circlecast? should i use another type of cast? I thought that since the object i'm shooting is a ball, a circlecast would fit more properly. please help im going crazy

[frigid pier]

Are you using continuous collision detection?

Or you handling collision detection manually?

Then you need to account for frames that go through the geometry yourself

In any case you need to describe in detail your setup to get an idea about what's going on.

[night flame]

in the ball? or in the trajectory?

this is the code for the trajectory,

 void EnableLaser()
    {
        // Create the layer mask
        LayerMask mask = (1 << wallLayer) | (1 << groundLayer);
        var mousePos = (Vector2)cam.ScreenToWorldPoint(Input.mousePosition);
        Vector2 sparaPosition = transform.position;
        Laser.enabled = true;
        Vector2 _velocity = -transform.up * power;
        Vector2[] trajectory = Plot(palla, FirePoint.position, _velocity, 200);
        Laser.positionCount = trajectory.Length;
        Vector2 spherecenter;
        Vector3[] positions = new Vector3[trajectory.Length];
        RaycastHit2D hit;
        Laser.transform.position = trajectory[0];
        StartVFX.SetActive(true);
        StartVFX.transform.position = (Vector2)FirePoint.position;
        StartVFX.transform.rotation = FirePoint.rotation;
        positions[0] = trajectory[0];
        EndVFX.SetActive(false);

        if (Laser.positionCount >= 198)
        {
            EndPointer.transform.position = trajectory[trajectory.Length - 1];
            EndPointer.transform.up = -(trajectory[trajectory.Length - 1] - trajectory[trajectory.Length - 2]);
            EndPointer.SetActive(true);
        }
        for (int i = 0; i < trajectory.Length - 1; i++)
        {
            Vector2 posA = trajectory[i]; // Current point
            Vector2 posB = trajectory[i + 1]; // Next point
            spherecenter = posA;
            hit = Physics2D.CircleCast((Vector2)posA, circlesize, (posB - posA).normalized, 0.01f, mask); ;
            positions[i + 1] = trajectory[i + 1];

            if (hit.collider != null)
            {

                EndPointer.SetActive(false);
                Laser.positionCount = i + 1;
                EndVFX.transform.position = posB;
                EndVFX.SetActive(true);

                break;
            }
        }
        Laser.SetPositions(positions);

    }

[frigid pier]

If it's just about testing collision corridor before launch, use gizmos to visualize the problem at every step.

[night flame]

do you think circlecast is suitable for this? or should i use a boxcast?

[frigid pier]

You are bending your trajectory, are you probing every position correctly when it's bent?

https://docs.unity3d.com/ScriptReference/Gizmos.html

Visualize and check

[night flame]

i tried using gizmos but i can't figure out how

like

i have a lot of function private vars and idk how to bring them to the ongizmodraw

[frigid pier]

You need this one, https://docs.unity3d.com/ScriptReference/Gizmos.DrawWireSphere.html there's usage example

Draw gizmo for every position you probe. Will become obvious where you don't check

[night flame]

how do i feed posA and circlesize to drawWireSphere?

[frigid pier]

You can make helper methods as well to pass the data

or use class variables for it

Have an array of items to display. Every time you do a cast add a gizmo to display

[night flame]

okay i wrote the code with no errors but nothing is happening

i simply added this to the code

void OnDrawGizmosSelected()
    {
        // Display the explosion radius when selected
        Gizmos.color = Color.white;
        Gizmos.DrawWireSphere(posA, circlesize);
    }

[frigid pier]

Are you using just one circle cast on the end of the line?

[night flame]

in the enableLaser function yea, i'm using only a circlecast that gets repeated * linepoint

having a way to visualize it wouldn't be bad ngl

[frigid pier]

Well your single circle cast is crawling unconnected to the trajectory, you can navigate it inside even probably

You need to cast on entire length of your line

[night flame]

hm?

[frigid pier]

like beads following a thread

to make sure the line never crosses colliders

[night flame]

i feel like this is written by chatgpt

[night flame]

i mean, it works for 99% of the times, but when it gets to the fine details it's a little bit off, but i think it is only because the size of the circlecast is not the same as the size of the ball

[frigid pier]

@stuck bay Please read #📖┃code-of-conduct about giving ChatGPT answers

@night flame Left is what you have I think, on the right is what you need

Cast every step, every length of a radius should be fine

• Ask or answer questions using unverified AI-generated responses.

If you verified it, then you should understand the answer digest it and write it yourself.

[night flame]

i have a circlecast for each point in trajectory.length, so i have like 200 circlecasts in that line

[frigid pier]

I'm not digging through AI gibberish

[frigid pier]

Then add each of them to an array and visualize in the gizmo

You'll see what's happening

[night flame]

Anyways, i found a fix for it! it was indeed just a problem of measures, and i didn't think about the simplest solution of all of them. I visualized a gizmo of circleSize and put my ball prefab next to it and changed circleSize till the sizes were equals and it works

flawlessly

[frigid pier]

Not discussing this. If you want to give an unswer - look it up, understand it and write it yourself don't dump AI answers in the server.

@stuck bay If you continue spamming on this topic I;m going to just mute you.

!mute 992439362560196700 Ignoring warnings.

[flint portal]

Evan.#5196 was muted

[wide nebula]

He has spamming down to a timed science, apparently.

[night flame]

can you help me with this?

i'd like to check a few things

and visualizing would help

[frigid pier]

Already explained how though.
Add every cast data into a collection. Modify OnGizmos to loop every frame that collection and display each of the casts as gizmo

[night flame]

mhh

i have some problems on the how to do that

xd

[frigid pier]

You want https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnDrawGizmos.html instead as well

So it will run constantly

[night flame]

i tried passing posA as a public variable and it's just 0 all the time

[frigid pier]

Did you manage to draw even one?

create a class list field
private List<(Vector3, float)> myGizmos = new();

Every time you cast circles myGizmos .Clear(); clear the list and refill it with circle data

[night flame]

yea

atm it's like this

[frigid pier]

Then OnDrawGizmos() loop the collection.

[night flame]

this is w only one

[night flame]

how do i fill it with circle data?

[frigid pier]

OnDrawGizmos() {
  if(myGizmos.Count == 0) return;
  Foreach (var tupleWithData in myGizmos){
  ///use data from tuple to draw all gizmos
  }
}

[night flame]

i'm sorry im being so needy btw, i'm kinda lost rn

[frigid pier]

You drawing the last one, put all of them into a collection and draw all of them

[night flame]

okay, but how can i add each circle data in mygizmos?

void EnableLaser()
    {
        int wallLayer = LayerMask.NameToLayer("Wall");
        int groundLayer = LayerMask.NameToLayer("ground");

        // Create the layer mask
        LayerMask mask = (1 << wallLayer) | (1 << groundLayer);
        var mousePos = (Vector2)cam.ScreenToWorldPoint(Input.mousePosition);
        Vector2 sparaPosition = transform.position;
        Laser.enabled = true;
        Vector2 _velocity = -transform.up * power;
        Vector2[] trajectory = Plot(palla, FirePoint.position, _velocity, 200);
        Laser.positionCount = trajectory.Length;
        Vector2 spherecenter;
        Vector3[] positions = new Vector3[trajectory.Length];
        RaycastHit2D hit;
        Laser.transform.position = trajectory[0];
        StartVFX.SetActive(true);
        StartVFX.transform.position = (Vector2)FirePoint.position;
        StartVFX.transform.rotation = FirePoint.rotation;
        positions[0] = trajectory[0];
        EndVFX.SetActive(false);

        if (Laser.positionCount >= 198)
        {
            EndPointer.transform.position = trajectory[trajectory.Length - 1];
            EndPointer.transform.up = -(trajectory[trajectory.Length - 1] - trajectory[trajectory.Length - 2]);
            EndPointer.SetActive(true);
        }
**        for (int i = 0; i < trajectory.Length - 1; i++)
        {
            posA = trajectory[i]; // Current point
            Vector2 posB = trajectory[i + 1]; // Next point
            spherecenter = posA;
            hit = Physics2D.CircleCast((Vector2)posA, circlesize, (posB - posA).normalized, 0.01f, mask);
            myGizmos.Add(hit);
            positions[i + 1] = trajectory[i + 1];
```**
im guessing somewhere here in the last for loop?

[frigid pier]

Clear the list in the beginning, then every time you cast add cast data to element

This is how you add data to tuple element of List<(Vector3, float)> myGizmos = new();
myGizmos.Add((new Vector3(0,0,0), 0f));

[night flame]

and from where do i extract this data?

i'm not following you, i'm sorry

[frigid pier]

then

OnDrawGizmos() {
  if(myGizmos.Count == 0) return;
   foreach (var myTuple in myGizmos) {
    Gizmos.DrawWireSphere(myTuple.Item1, myTuple.Item2);             
  }
}```

https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnDrawGizmos.html has example

It's a Unity method that if exist it will run it constantly

[night flame]

no yea i got it, i just don't get what i should put instead of myGizmos.Add((new Vector3(0,0,0), 0f));

[frigid pier]

Your hit position and radius of sphere

not hit, cast position

The data you use here
Physics2D.CircleCast((Vector2)posA, circlesize, (posB - posA).normalized, 0.01f, mask);

item1 is origin point of the cast

[night flame]

oh okay

i'm getting something!

but this doesn't look wrong, i think?

i still don't get why im getting wrong collisions then

[frigid pier]

Oh wait, that's a cast version as well. I was thinking of overlap circle.

So your actual cast looks like a 2d capsule

You might want to add start and end point

[night flame]

wdym?

[frigid pier]

CircleCast projects circle forward. Area hit looks like a capsule projected from start to end point

Harder to display, but you need both points to see where it goes

[night flame]

so this is not accurate?

[frigid pier]

Looks like it yes. If you added just beginning point of the cast you display only those

[night flame]

so it is accurate

[frigid pier]

last cast on the end point might project much further when it's not hitting anything

Your sampling is too dense though for your purpose. You can get away with a lot fewer.

[night flame]

so i got what my problem is

but i don't know why is that

the gizmos overlaps with the dots but it doesn't change the trajectory

[frigid pier]

You might want to use draw line to display reflected trajectory you trying to achieve

[night flame]

this causes the ball to collide

why doesn't the trajectory just stop there then?

[frigid pier]

It looks like you might not be actually checking when any of them hitting, maybe chacking only if the last one hitting.

Check logic

Pretty much this happening <#⚛️┃physics message>

you just discarding collisions from earlier ones

[night flame]

well the logic seems fine to me

        Vector2[] trajectory = Plot(palla, FirePoint.position, _velocity, 200);
        Laser.positionCount = trajectory.Length;
        Vector2 spherecenter;
        Vector3[] positions = new Vector3[trajectory.Length];
        RaycastHit2D hit;
        Laser.transform.position = trajectory[0];
        StartVFX.SetActive(true);
        StartVFX.transform.position = (Vector2)FirePoint.position;
        StartVFX.transform.rotation = FirePoint.rotation;
        positions[0] = trajectory[0];
        EndVFX.SetActive(false);
        for (int i = 0; i < trajectory.Length - 1; i++)
        {
            posA = trajectory[i]; // Current point
            Vector2 posB = trajectory[i + 1]; // Next point
            spherecenter = posA;
            hit = Physics2D.CircleCast((Vector2)posA, circlesize, (posB - posA).normalized, 0.01f, mask);
            myGizmos.Add((posA, circlesize));
            positions[i + 1] = trajectory[i + 1];

            if (hit.collider != null)
            {

                EndPointer.SetActive(false);
                Laser.positionCount = i + 1;
                EndVFX.transform.position = posB;
                EndVFX.SetActive(true);

                break;
            }
        }
        Laser.SetPositions(positions);

    }

[frigid pier]

It's probably in your breaking logic. You need to make sure that everything was reset

[night flame]

you mean when i deactivate the trajectory?

[frigid pier]

When you hit something and it's not the last element you are not breaking and resetting properly

[night flame]

can you help me? i got some help with this code and i can't navigate through it much

[night flame]

got it, so what should i do?

[frigid pier]

Use debug messages to output when collision happens and it's not the last element

Are you clearing gizmos list?

[night flame]

at the start of enablelaser, yea

i'll send you the whole script for clearance

[frigid pier]

!code

[flint portal]

Posting code

📃 Large Code Blocks
Large code blocks should be posted as links to services like:
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📃 Inline Code
Surround code with three backquotes. Not quotation marks.
To get C# formatting the first line should only contain cs or csharp.
Add a comment with a line number if there is an error message.
```cs
// Your code here
```
Do not share screenshots of code unless requested.

[night flame]

https://codeshare.io/eV6yqJ

or that xd

[frigid pier]

Simplify to 3 casts to not flood debug log, put debug messages on each collision and output their order and pos. If you see that another cast being made after previous hit look up why it's not stopping.

[night flame]

how do i reduce the casts without reducing the line points?

[frigid pier]

By reducing the line points

[night flame]

but then the line gets really short

[frigid pier]

How are you bending the line?

Are you just rotating each point?

[night flame]

have a look at the last function

of the script

[frigid pier]

So you have steps there, reduce steps

you'll get fewer samples

each circle cast should cast toward the next point

not just random small length

So they will form chain

[night flame]

changing the steps here: cs Vector2[] trajectory = Plot(palla, FirePoint.position, _velocity, 10);
doesn't just give fewer samples, but it will make the line shorter

cause steps size makes the trajectory[] size smaller and from there derives the whole line

[frigid pier]

That's not a great implementation. You should look into how to plot a trajectory that you can sample any point on it. But fine. Leave as is and make sure to debug this:

put debug messages on each collision and output their order and pos. If you see that another cast being made after previous hit look up why it's not stopping.

[night flame]

yea i should probably make all of this better, it gave me such an headache when i did it

i'm so down that i still have problems w it

i thought i was done

[night flame]

the collider seems like it's working fine..it's just not that accurate, i dont know why. it overlaps a bit before working

and that kinda breaks it for me

[frigid pier]

You were not registering collisions at all when they were overlapping

[night flame]

yea, the borders don't give collisions

i dont know why

[frigid pier]

Are you sure it's not just incorrect radius on your objects?

Look at their colliders, it looks it's just smaller than the image

[night flame]

you mean the placed ones?

thatd be hilarious ngl

but if that was the point, it wouldnt be a problem for the ball i throw

[frigid pier]

not if ball collider larger

[night flame]

okay the objects collider were indeed wrong, the placed ones

the ball's one is not, tho

[frigid pier]

2d physics has larger default contact offset. Especially noticeable with smaller objects

[night flame]

huh?

[frigid pier]

If you see during collision space between colliders, reduce contact distance in physics 2d settings

[night flame]

you mean the default contact offset?

that is set at 0.01?

[frigid pier]

yes

[night flame]

the min value i can set is 0.0001

i dont think thatd be noticeable

i'll try

[night flame]

still, maybe even worse, could it be the ball at this point? not being in the right pos?

@frigid pier i think the major problem is that it's not accurate

the trajectory, itself, it's not accurate

i tried with a video editing tool to look closely

frame per frame

On the left there is the trajectory i used to shoot, on the left where the ball lands, it's clearly offset

[frigid pier]

Display colliders when testing on the scene and look closer

select object to see their collider gizmos

[night flame]

i'll inspect better again with premiere and this

[stuck bay]

I want to ad a collider to a tree, but mesh collider isn't helping...

[frigid pier]

you don't need a convex collider on non dynamic physics objects

can get away with just a capsule as well

[night flame]

@frigid pier i got a better overview, i'm sending the video

[stuck bay]

I want the player to be able to climb them though...

not sure how I would go about this

[night flame]

how big is this tree gonna be?

[frigid pier]

If you have a lot of them put a capsule on every branch

[stuck bay]

about 60 feet...

or 18 meters tall

[night flame]

then i'd make every branch with different colliders

one won't ever do the trick

[frigid pier]

You have all the tools you need. Fix colliders, match raycast radius to the ball

[night flame]

but everything is already done tho

i don't get it.

[stuck bay]

so are you saying use box colliders?

can you add more than 1 to an object?

[frigid pier]

Capsule is more efficient than the box

you probably would want tree trunk to be round as well

[night flame]

got any other idea? it's clearly not that

the raycast radius and the ball's one are the exact same

[stuck bay]

could this work?

[night flame]

@frigid pier i got why i have the problem, can you help me fix it?

the ball goes out of the trajectory over time, i'm guessing there is some calculation problems xd

[unique cave]

Yes, but you cannot orient them separately, therefore making child objects that has one collider each would be better idea (and use capsule, not box, as been mentioned they are faster and fits the tree shape better)

[unique cave]

Why not, if the tree doesnt need to be moved by physics, non convex is fine 😅

[silver moss]

Did he say it's dynamic though? If no, the concave mesh collider is fine

[unique cave]

@silver moss He didnt, I missunderstood what they said earlier, sorry for the confusion

[unique cave]

So yeah... but is the tree now made of multiple meshes and colliders? Single mesh with mesh collider in it should work assuming its set to non convex

[timid dove]

Code is obviously needed

[stuck bay]

yeah I got it to work. I'm so smart

[hexed violet]

Hello

I have a math question, hope some one could help

I have this piece of code:

float targetThrust = 0;
    if (moveForward)
        targetThrust = maxThrust;
    currentThrust = Mathf.Lerp(currentThrust, targetThrust, currentThrust * 0.00035f + 0.0005f);
    rb.AddRelativeForce(new Vector3(0, 0, currentThrust), ForceMode.Acceleration);

What am doing here is to decrease acceleration over time

What I want to do are these 2 things:

1. Control how quick or slow the ship accelerates
2. Since maxThrust defines the max speed the ship will reach, I want to some how make it that by accelerating, the ship will reach it's max speed in the same time no matter if the max thrust is 50 or 1000

Can some on help with this please

[night flame]

@frigid pier hey man, i'm sorry if this bothers you, but u were the person with the most knowledge on the physics system of unity i've talked to in the past days. I'd be happy if you could look at my setup of the trajectory system we were thinkering the other day, since i swapped from a math solution to a whole physics simulation and i'm still kind of far from the accuracy i'd want, probably for inexperience

[frigid pier]

You have everything you need. Examine colliders, adjust your cast to match the radius.

[night flame]

hey

as i said, i am not using that math anymore

i'm trying to achieve a better result with a physics simulation

it's just weirdly..off

[frigid pier]

And don't ping me. Post your question, if someone can answer they will.

[night flame]

yea, i figured it would bother you, i'm sorry, i just wanted your answer in particular

i've been asking the whole day, and a lot of people answered actually, but no one could've helped me in this

[night flame]

well anyways, if you feel like and whenever ur free, i posted a complete picture of my problem on stackoverflow, i'd be happy if you checked it out https://stackoverflow.com/questions/75632675/problems-calculating-velocity-of-physics-simulation-in-unity

[flint portal]

You can format your multiline code block with C# highlighting! Just add cs to the start of it. Highlighting example below!

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{
    public void PetCat ()
    {
        Debug.Log ("Petting Cat.")
    }
}

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[dark ravine]

How can I fix this rigidbody stacking issue?

[fierce depot]

Hello,
I currently want to freeze positions and rotations on a lot of rigidbody of my scene but, when i do it the game becomes extrelemy laggy (when i check the profiler it says that it is because of the physics so i suppose that freezing positions and rotation is not good for performances). Is there anyway to make it less laggy / optimise it ?

[oblique parrot]

Hello!
I'm trying to make a game about fishing, so I'd like to have a fishing line you can reel out/in and move side to side. If anybody can recc some good resources/tutorials, or knows about any existing Unity components that'd make my life easier, I'd be very grateful. Thank you!

[stuck bay]

how can I remove a sphere collider from a sphere?

[timid dove]

Same way you remove any component. Just remove it in the inspector

[stuck bay]

not sure how I can do that...

[night flame]

uhm

[night flame]

you click on the sphere collider and press Del on your keyboard or right click > remove component

[stuck bay]

yeah I'm just dumb

thanks

[night flame]

I made a trajectory using Physics2D.simulate, everything works fine except id want the trajectory to stop after x collision and i can't manage to understand how
anyone got clues on how to achieve this?

public void SimulateTrajectory(Ball ballPrefab, Vector2 pos, Vector2 velocity)
    {
        var ghostObj = ghostObj2; //Ball instantiation

        ghostObj.GetComponent<BallCollision>().enabled = false;
        ghostObj.GetComponentInChildren<SpriteRenderer>().enabled = false; //taking away properties from the replicated obj
        ghostObj.AddComponent<prova>();
        SceneManager.MoveGameObjectToScene(ghostObj.gameObject, _simulationScene); //moving the replicated obj in another scene
        ghostObj.transform.position = pos; // resetting the replicated obj's position
        ghostObj.GetComponent<Rigidbody2D>().velocity = Vector2.zero; // resetting the replicated obj's velocity
        ghostObj.GetComponent<Rigidbody2D>().angularVelocity = 0;// resetting the replicated obj's angVelocity

        ghostObj.Init(velocity, true); //shooting the ghostObj
        _line.positionCount = maxLinePoints;

        for (var i = 0; i < maxLinePoints; i++)
        {
            if (prova.Instance.collisionNumber == 1)
            {
                _line.positionCount = i - 1 ; //here i tried to break the line on collision but it's really choppy
                break;
            }
            else _line.positionCount = maxLinePoints;

            if (!isPaused)
            {
                _physicsScene.Simulate(Time.fixedDeltaTime);
                _line.SetPosition(i, ghostObj.transform.position);
                

            }
            else {
                _line.enabled = false;
            }
        }
    }

[ashen vault]

im working on 2d hobby project and im quite new to unity. i guess i have a problem with colliders. Sometimes my gameobjects stucks and i can't click on them. can someone help me?

[unique cave]

Provide more information, screen recording would be helpful

[ashen vault]

@unique cave can i screen share with you?

[unique cave]

Just capture a screen recording and post it here so anyone can help

[ashen vault]

okay

as you can see i could move the object at first but later it jammed i don't know what to do?

[next rune]

hello i have been trying to make a car without using the wheel colliders , but havet been able to get the correct drag/power ratio. if i set the drag and power and the power curve to get the top speed i want for te 1. gear the car cant accselerate in the 2. gear does anybody how a tutorial/guide for that (i am not using wheel colliders)

[unique cave]

doesn't seem collider issue, it seems for me more like your code is just not working properly

[ashen vault]

there were no slots in the scene and dragging objects script was working

[unique cave]

it's clearly not working anymore

[ashen vault]

since gameobject collides with the slot every time can it be the problem?

[unique cave]

Well, I have no clue how everything is set up so cant be more of a help

[ashen vault]

thanks bro

[median frost]

Is there a way to disable gravity in Unity Physics (DOTS)?

[desert salmon]

how do i fix my bullet going really off course (green is the raycast representing the path its supposed to travel, yellow is the trial of the bullet representing its course)

this is the code

//set position and rotation
        transform.position = bulletHole.transform.position;
        transform.LookAt(predictor.transform.position, transform.up);

        
        //create raycast to player predictor
        RaycastHit hitInfo;

        if (Physics.Raycast(bulletHole.transform.position
            , transform.forward
            , out hitInfo
            , 999
            , enemyAIScript.playerLayerMask))
        {
            //raycast hit
            //make bullet face raycast hitpoint
            Debug.Log("racycast hit");
            transform.rotation = Quaternion.LookRotation(hitInfo.point - transform.position, Vector3.up);
        }
        else
        {
            Debug.Log("no hit");
        }

        Debug.DrawRay(bulletHole.transform.position, transform.forward * 55, Color.green, enemyAIScript.enemyBulletDuration);

        //apply velocity to bullet
        rb.AddForce(transform.forward * enemyAIScript.enemyBulletSpeed, ForceMode.VelocityChange);
        hasShot = true;

its under OnEnable in the bullet script

usually its fine but when i move far from the enemy and move around this occurs

[flat pewter]

I'm making a VR game using FinalIK, and also own Puppetmaster. I'm trying to create a setup where I can play animations, but prevent the hands and feet from entering colliders.

On the surface, this seems like a simple enough problem. FinalIK even provides a Penetration Avoidance example. But this example code, while working well specifically for characters that are standing up and walking past walls, falls apart when I want to have a character fall over and writhe on the ground (no ragdoll here), lean over on a table, or sit and swing their legs (which should collide with the surface they're sitting on when they swing back).

The Penetration Avoidance example uses spherecasts from the hands and feet to the center of mass. This works well for standing, but when laying down as seen above, the feet will contact the ground and stop for a moment, but then continue through, because I believe it is casting the spheres from the animated position of the limbs and not from the last IK position that had remained above ground.

I'm thinking maybe I need to use a SphereCast to sweep the hand and feet sphere colliders through space from the last IK'd position to the animated position, though I'm not sure about how to go about doing that within the framework of the PenetrationAvoidance script.

Barring that, I may need to use Puppetmaster even if I don't want full physical simulation of ragdolls.

But full physical simulation isn't gonna move the feet back up out of the ground if they start in the ground because I slid the avatar down so that their hands are in contact with a lower table but I still want their feet planted on the floor. Nor will it automatically move a foot out of a rock if the sitting animation starts with the foot on the backswing. Though I suppose in that case if the collider's trying to actively move out of the rock, it will be successful.

Any ideas?

[vast mulch]

hey, i have 2 rigidbodies in my scene, my player and a ship. the ship has a controller which uses rigidbody forces. the problem im running into is my player's collider can hit the ship, and send it flying. is there a way i can make certain objects not affect a rigidbody?

[timid dove]

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

[vast mulch]

hi, the problem with this is that while this fixes the issue i pass through the object since there is no collision. i want a kinematic like interaction without making my rigidbody kinematic

[errant moss]

given two objects, is there a fast way to check if there's an ongoing collision between the two? as in, some way to tell if OnCollisionStay will be called for their collision on the physics update

[timid dove]

sounds like a problem for the asset store package I've been working on 😅

https://www.youtube.com/watch?v=Ft-VN2o-aq0

[hexed violet]

Hi there

I got a question

Is it possible to change the velocity of a rigid body, lets say the vector is (0, 0, 1) and it's magnitude is 10, which means it goes forward on z axis, but then I want to make a smooth transition simulating a portal, and lets say that the entry portal is oriented as (0, 0, 1), same as where the object is moving, but the exit portal is rotated 90º CW meaning that when the object exits the portal to make the illusion, I have to transform the velocity vector which will now be (1, 0, 0) with the same magnitude (10)

Am I right with this procedure, or I am completely wrong?

I want to keep the momentum of velocity, but I want to change the direction instantly

[timid dove]

you basically can just do this:

Vector3 inDir = -inPortal.transform.forward;
Vector3 outDir = outPortal.transform.forward;

Quaternion rotDif = Quaternion.FromToRotation(inDir, outDir);
rb.velocity = rotDif * rb.velocity;```

you might have to play slightly with how inDir and outDir are defined depending on how your portals are set up and oriented

[hexed violet]

Ok, I see, so it´s possible

thanks

[timid dove]

of course it's possible

everything is possible

[hexed violet]

Hey, I want to ask some advice

So let's say I am applying force (acceleration mode) to an object in a straight line along it's forward axis (z)

Then I apply torque to rotate the object left (y)

as I apply torque using add relative torque the object direction starts to change, but as the drag force is really small, it feels like the object slides a lot

So what can I do to change direction of movement faster?

It's really hard to explain

If I stop applying force, I want the velocity to change direction based on where the object is heading at a cost of loss of speed

Like a plane that goes really fast and uses the wings to change direction but losing it's speed

I think I have to research plane physics

[errant moss]

have you tried rotating its velocity towards its new forward vector after applying the torque?

[hexed violet]

En I am first applying force then torque in that order

[hexed violet]

Like this @errant moss ?

[errant moss]

I think so

[hexed violet]

I am not really good at physics

[errant moss]

if I understand correctly what is happening is that you're rotating the object and want it to maintain some of its velocity before the rotation towards its new orientation

[hexed violet]

Quite the oppsite

I want to substract part of that velocity based on the new rotation

Lets say I accelerate the object in the air on a straight line, then I stop acceleration and the drag force will make the object lose velocity over time, now if I rotate the object aplying torque, this won't affect the velocity

This behaviour can be seen on a ball, if you throw it in the air, as it spins, it won't really chamge the velocity that much because of it's shape

Now, if a plane flies on a straight line and suddenly stops to throttle, it will start to decelerate, but it will keep going forward, until it pitches, rolls or yaws, which will result in velocity change, changing the heading direction and a notible decrease in speed

[hexed violet]

This is what I want to achieve

Some how change the velocity and the magnitude of that velocity by just rotating the obiect

[errant moss]

it does sound to me like rotating the object velocity towards its forward would get you halfway there

then you could scale it down by some amount based on how much the object rotated

[hexed violet]

Hmmm sound like it

And use a varible to contol how much influence the rotation has over the velocity

I've read that it's not the best practice to mess up with velocy directly

I have to play around with it a bit, thanks for the advice @errant moss

[errant moss]

it can cause problems if you have multiple things modifying it and overriding each other

multiple functions applying forces result in the sum of the forces, while multiple functions modifying velocity will just override each other and only the last one will have any effect

[hexed violet]

Yep

[vast mulch]

Haha, no way what a coincidence, when is it coming out?

[stark pendant]

Hey 👋
I'm trying to apply simple IK algorithms I implemented earlier on ur3 using articulation bodies.
But having troubles with angles constraints and giving ik links a single angle to rotate around ( to suit the xdrive of articulation Body)
Anyone could send me an article/tutorial that discusses the implementation?

[fresh patrol]

Hi everyone. How can i display an edge collider on game screen?

[unique cave]

Use line renderer

[fresh patrol]

oh sry i already solved this. I just had to turn on the gizmos on the game screen

[unique cave]

Be aware that gizmos will not be visible on builds

So if you want it to be visible in the final game, you have to use something other like line renderer

[fresh patrol]

thx for the info. It works better for me if they don't render in the build

[timid dove]

Once I sort out my custom inspector issues and put together some decent showcase videos 😅

[vast mulch]

lol, what about pricing?

[timid dove]

Undecided. What would you pay for such a thing?

[vast mulch]

depending on the functionality, between 15 to 30 bucks

but it completely is up to you, if you think its something thats worth a high price and the work you put into it makes it makes you feel the same. go for a higher price.

either way really cool seeing people adding to the original physics system and making it better

[timid dove]

The asset is going to have several features, the selective kinematics thing is just one of them. But I know that customers will probably only want the asset for one or two features, so I plan to price it as though it basically only has one feature.

15-30 is about the range I was thinking about so glad to hear I'm not totally off base there.

[vast mulch]

good to hear, can't wait. if you have one, can you send ur asset creator page?

[timid dove]

I will as soon as it's up 😉

[hexed violet]

Dang it I ma struggling a bit here, need some help

I need help with a vector problem

So, I know the velocity vector from rigidbody.velocity and I also know the forward vector of my ship, so when I turn the ship left or right I want to apply some force to the rigid body multiplied by some influence value to align the velocity vector to the ship forward vector

and make the velocity vector decrease depending on the angle between both vectors

does it makes sense?

The ship that travels at x speed, I want it to change direction and lose speed by just turning left or right

[vast mulch]

hey, another pretty niche question, is there any way i can use getpointvelocity with a kinematic rigidbody. if not, is there an alternative for the same function? thanks :))

[timid dove]

Kinematic Rigidbodies don't move with velocity so no

You'd have to do the math yourself

[errant moss]

hey, did you figure this out?

[hexed violet]

No

Not yet

[errant moss]

do you want some help?

[hexed violet]

Yep

I can share my code

[errant moss]

sure

[errant moss]

ok, I was going to suggest you to multiply your forward vector by the velocity magnitude to get your new velocity

but that wouldn't work having strafe there

[hexed violet]

Yep

[errant moss]

I can't figure out what function you could use to set the rate of rotation of velocity there

maybe something with the cos of the angle between the velocity and the forward

have you tried anything like that?

https://docs.unity3d.com/ScriptReference/Vector3.RotateTowards.html

using this function and pretty much the example there

you would rotate your velocity as current and your forward as target

and the singleStep would have to be something in function of the angle between the two, so that it is 0 when both are perpendicular and increasing as the directions of forward and velocity get closer

am I making sense?

[hexed violet]

Yes

thanks

I am going to try that aproach

[vast mulch]

I see, thanks

[mighty bobcat]

Hello, Is there anyway to improve the Hit box around a player when using a Character Controller or should i switch to a ridge body for this?

[timid dove]

CC can only be a vertical capsule

[mighty bobcat]

is CC the correct thing to use or should i be using ridge body?

[forest lance]

personally I think rigidbodies are better since they use physics

[mighty bobcat]

Ill go read the docs ty sir

[timid dove]

Every game is different

[wispy pewter]

is the default physics engine deterministic now or not ? Conflicting information online

[unique cave]

Not really

[timid dove]

Deterministic on the same hardware

[vast mulch]

hey, i have a question, does anyone have a good rigidbody carrier system. by rigidbody carrier i mean a system where an object, for example a ship can carry a rigidbody or a player (in this case) that is inside said ship without parenting?

[stuck bay]

I've never done that, but I think you could make a script, for example:

if (player.inship == true)
{
//move the ship with player code
}

[wind meadow]

how does compound colliders work? Is it the parent and all the children of the parent with their colliders are treated as one big collider?

[timid dove]

not really treated as one big collider but all colliders are treated as the overall shape of the Rigidbody

[wind meadow]

oh ok so that influences the rigidbody

[timid dove]

Yes the colliders define the shape of the Rigidbody.

[wind meadow]

ok cause I'm trying to get Square gameobject to be able to call ontriggerenter2D using the boxcollider of Circle gameobject set to trigger

so was unsure if the player colliding with the circle gameobject would allow for the square ontriggerenter2D to activate

[timid dove]

If Square has a Rigidbody2D, and Circle has a COllider2D (set to trigger), and there are NO other Rigidbody2Ds in the hierarchy, then it can work.

[wind meadow]

ah the only other rigidbody between the two is LightSlime

[timid dove]

that's a problem

why do you have two RBs

anyway that will prevent the OnTriggerEnter2D message from bubbling up to the top

[wind meadow]

basically pseudo 3D for my 2D beat em up. I have a base rigid body responsible for the knockback (Square) to push back the entire enemy and then the rigidbody for the model itself (Lightslime) for when you launch the character

[slate verge]

Hmm my character seems to be stuck in the jumping animation. i don't think the ground layers are colliding properly. any ideas?

[arctic marsh]

your character seem to be stuck in midair so they would never collide? Are you sure your collider is jumping with the character or just the animation is setting him up

[peak panther]

If I have a Kinematic Rigidbody2D whose velocity I am setting, is there a way to accurately predict its position each frame? I want to make an indicator for the travel path for this object that perfectly shows its position each frame.

Is this possible or is there some natural inaccuracies with Rigidbodies even if they're kinematic?

Cause I can't seem to get it perfect.

But idk if that's just me goofing math or Unity physics stuff.

Probably me but you know... gotta make sure 😛

[arctic marsh]

So you move your rigidbody yyourself with setting velocity, right? So you already know at what vector and speed your rigidbody is moving, dont you?

[peak panther]

yep

I'm already doing a sorta "micro simulation" of the forces and velocities involved to try to predict the position.

It's just not matching the actual position perfetly.

[arctic marsh]

than it might be your math at some point. Cause if you set the velocity yourself, there is nothing unity could predict for you, as you already setting the rules

so, you could show your code here to talk about it. Also found this https://answers.unity.com/questions/898742/predict-next-rigidbody-position-based-on-velocity.html

[fallen thicket]

Hey, I have a problem with carrying a rigidbody object. When I make it follow a set point in front of the player, it jitters. Also, I want it to interact with walls, but at the moment when pushed slowly into a wall it goes through it.

I’ve tried three different ways of moving the object:
transform.position = holdArea.position
rb.MovePosition(holdArea.position)
rb.position = holdArea.position

where holdArea is the point in front of the player that is a child of the camera so moves with it.

I’ve also tried each of these in FixedUpdate, Update, and LateUpdate, and with all interpolation options on the rigidbody.

The best option for reducing jitter has been using transform.position in LateUpdate, but this makes the collisions even worse. All the other options have no noticeable differences between them.

Any thoughts on how I could fix this? Thanks

Video of problem:
https://v.redd.it/link/11pu5ab/asset/vkijawfxbena1/HLSPlaylist.m3u8?a=1681296809,NDg4N2ViZGFhMzZlOTE1ZTgzZGI0OTdkZTRmOWU1YjRjNzZhYmRkYzY0Njc4Mzk1Y2FmMmRjMWRlZjMzM2VkZQ%3D%3D&v=1&f=sd&utm_source=share&utm_medium=ios_app&utm_name=iossmf&utm_term=link

Script attached to object:
https://gist.github.com/TheCardyMan/4ed74bc00520eea01301c141469ab69d

[arctic marsh]

setting the position will ignore physics. Setting the object to be child of something will probably also move the object with some form of position and ignore physics. Especially if you add some position handling to the child too, that is causing your jitter

[fallen thicket]

the object isn’t a child of anything that’s moving. I think the problem is that the rigidbody is being moved every fixedupdate, but the holdArea is moving every Update. But I have to use FixedUpdate for the collisions to work properly

the jitter and collision problems happen even if I use MovePosition in FixedUpdate

[arctic marsh]

Ah okay, misread your child text then, its the holdArea that is part of the camera. So, you move your rigidbody towards the position of the holdarea, yes?

[fallen thicket]

yes

[arctic marsh]

And moveposition is jittering for you?

Your rigidbody is kinematic, right?

[fallen thicket]

hmmm not sure actually

i don’t have it open right now. i’ll go check

[torpid sinew]

Hey, how can I make the Physics more realistic? My current jump feels like the Character is floating to me...

[fallen thicket]

no it wasn’t, but when I make it kinematic it stops moving all together because gravity and my Move() method can’t affect it. I’ve managed to improve it a little bit by making it use transform.position in Update when not colliding and MovePosition in FixedUpdate when colliding, but there’s still a bit of jitter. I’ve fixed the collision problem by changing OnCollisionEnter to OnCollisionStay.

[arctic marsh]

if you use moveposition but also use gravity, I expect it to jitter at some point

[fallen thicket]

I turn gravity off when it gets picked up. I’ve reduced the jitter even more by changing Update to LateUpdate.

[arctic marsh]

that all sounds a bit hacky tbh. will you use the full physics system or just collision with walls and what not?

[fallen thicket]

what do you mean?

[arctic marsh]

I was just thinking if you could just use raycasting or spherecasting to simulate avoiding a wall with your object instead of trying to hack it into the physics system itself

[fallen thicket]

i’ll probably just keep it as it is. it seems to work fine

would there be any advantage to doing it like that?

[arctic marsh]

You could just use transform.position and have smoother and precise moving to a specific point but of course would have to simulate your physics needs yourself

imagine those weapons on modern games that avoid walls if you get close, thats not physics based but just checking distance to the wall most of the time

[fallen thicket]

🤔 you know i haven’t been able to find a tutorial that mentions my problem but it might be that weapon clipping is the same problem, and there’s a bunch of tutorials on that, so i’ll check it out. thanks 🙂

[arctic marsh]

the clipping is usually solved by rendering the weapon above the wall, you want to add avoid mesh or something to not run into camera tutorials 😉

[fallen thicket]

ah right thanks

[torpid sinew]

I think this conversation is over now? Can someone help me with this?

(I just need a general Direction to go in :D)

[arctic marsh]

Maybe show how you let your character jump? Also think about using mass correctly to be more "realistic"

[nimble coral]

anyone know how to program a mechanical belt system that transfers complete torque but doesnt break for reasons stated in image

[arctic marsh]

you can always try to use unitys mesh collider and see how fast physics can catch up but I guess, it might still break at some point if you dont give it some fallback calculation to not slip through other gears.

[slate verge]

fair lol, I'm not sure how to check if the collider is jumping too

[arctic marsh]

Select your collider in scene view while jumping and see where it is

[nimble coral]

its 2d animation game

[arctic marsh]

there are polygon2d colliders too, not sure how performant they are in this case

[slate verge]

weird. so I'm using the third person character controller from the starter assets and there isn't a collider rigged up to a character in the sample scene, and yet the character works fine in that scene?

[arctic marsh]

Oh now I got your chain belt thing! I thought its about a chain of gears, my bad

[nimble coral]

is there a better channel to ask

like scripting

[arctic marsh]

Phew, good question. as long as you do not script it, no, but if you try to script it and have some code, you can go to coding for sure

[nimble coral]

the coding is what im trying to figure out

[wary ferry]

I'm trying to make a rug that moves around when a player walks on top of it. The rug is covering up a hatch, and the player has to step on the rug so that it uncovers the hatch. Is this possible using physics, or is this something I should do with animation?

[hexed violet]

I have figured out some stuff, but I need some help here please

    private void CalculateThrustForce()
    {
        float thrust = Input.GetAxis("Thrust");

        thrustAcceleration += (Time.fixedDeltaTime * thrust);
        thrustAcceleration = Mathf.Clamp(thrustAcceleration, -1f, 1f);

        float thrustAmount = Mathf.Lerp(0, maxThrust, Mathf.Abs(thrustAcceleration) / thrustTime);
        rb.AddRelativeForce(new Vector3(0, 0, thrustAmount) * thrustMultiplier, ForceMode.Acceleration);
    }

I need "maxThrust" to be 0 when "thrust" is 0

[timid dove]

seems unlikely you would ever want to change maxThrust

[hexed violet]

Yeah, I think so

Can you give me an advice please

This line here is to reach max speed in the time I set, for example in 3 seconds in this case

[timid dove]

not without you explaining what you're trying to do and what's going wrong

[hexed violet]

float thrustAmount = Mathf.Lerp(0, maxThrust, Mathf.Abs(thrustAcceleration) / thrustTime);

Ok

let me explain to you

[timid dove]

If I understand what you want I would do it this way:

float currentThrust;
float acceleration = 1f/3f;

private void CalculateThrustForce()
{
    float thrustInput = Input.GetAxisRaw("Thrust");
    float targetThrust = thrustInput * maxThrust;
    currentThrust = Mathf.MoveTowards(currentThrust, targetThrust, Time.deltaTime * acceleration);
    rb.AddRelativeForce(new Vector3(0, 0, currentThrust), ForceMode.Acceleration);
}```

btw you should only do this AddForce in FixedUpdate

[hexed violet]

1. I have a ship that sticks to a track, I want to accelerate and decelerate
2. I want to simulate the acceleration in such way like you press a pedal so the ship acceleration will increase gradually
3. As you stop pressing the pedal the ship acceleration will decrease gradually, but it will still accelerate a bit after that
4. I want to use the same acceleration variable for break / reverse

[hexed violet]

Let me try

[timid dove]

3. As you stop pressing the pedal the ship acceleration will decrease gradually, but it will still accelerate a bit after that
   Are you sure you're not confusing the terms "velocity/speed" and "acceleration" here?

[hexed violet]

probably

[timid dove]

acceleration is how fast your speed is changing