⚛️┃physics

[sacred vault]

here is the code of the missile

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Bullet : MonoBehaviour
{
    // Start is called before the first frame update
    public BoxCollider boxCollider;
    public GameObject explosionParticle;


    void update()
    {
        
    }
    private void OnTriggerEnter(Collider other)
    {
        if(!other.CompareTag(tag))
        {
            Debug.Log("collidé");
            Explode();
        }
        
    }

    void Explode()
    {
        GameObject explosion = Instantiate(explosionParticle, gameObject.transform.position, Quaternion.identity);
        explosion.GetComponent<ParticleSystem>().Play();
        Destroy(gameObject);
        Destroy(explosion,2);
        
    }
}

the velocity is set to 100f

here is the missile

here is the collision parameters of the missile

what is wrong with my setup ?

[timid dove]

you probably just have an offset on your particle system prefab AND/OR the missile prefab

make sure your tool handle position is set to pivot in the editor

[sacred vault]

as you can see, 3 stages of the process, the particule system is triggered on the cross, and no, there is no offset in my prefab

when I gently drop the missile on the ground, the particle system is at the right place

[timid dove]

show the missile

[timid dove]

like you showed it here

but

is your tool handle position set to Pivot?

or Center?

Same for your particle system screenshots

Also in the prefab itself, show the inspector of the root object? Is the position there 0, 0, 0? Or something else?

[timid dove]

your inspector is in debug mode btw

[sacred vault]

yes ?

[timid dove]

ok so - you're using a trigger collider

and i assume your missile is moving quite fast?

[sacred vault]

yup

[timid dove]

This could just be some run of the mill tunnelling

[sacred vault]

yup 100f of velocity

[timid dove]

maybe instead of using OnTriggerEnter you use a non-trigger collider and OnCollisionEnter

another alternative is to do your own BoxCasting in FixedUpdate

[sacred vault]

I'm going to try OnCollisionEnter

same issue, it seems like this is the engine being not fast enough

I'm probably going to raycast where the missile is going to land and play the particle system at this raycasted point

[gilded blaze]

at any speeds where the collider moves more than its own size in one frame, you will get tunnelling. You can either use continuous collision detection mode on your rigidbody (can be expensive if there's a lot of them), or you can manually raycast ahead or after your object by script, and find stuff it might have missed along the way

raycasting is probably cheaper if you use scheduled raycasts instead of the normal ones

[sacred vault]

continuous collision doesn't change anything

[gilded blaze]

yeah, I haven't had too much luck with that either in the past

it's supposed to be more or less the same as raycasting behind your object to find collisions you would have missed (IINM), but I've never seen it work very well

in my experience, it's much more reliable to do the raycasting and do your own collision handling from any hits when they happen

[sacred vault]

it's working much better, thanks you guys 😉

[quiet dirge]

I got Dynamic Bones put into this rope on my model, and when I use Play in Unity, it moves as I slightly jiggle my model. When I export and load up the program to see my model move, the rope doesn't move at all.

Anyone have any clue?

[copper inlet]

Is there any way to make DOTS Unity Physics objects to collide with normal colliders? Been trying to figure out a way, but there seems to be none.

[carmine basin]

There is no way. I think Unity confirmed that there is no interaction possible at all between DOTS and regular objects

[copper inlet]

Yeah, figured out, but wanted to be sure. Thanks.

Though it's pretty sad. Would've really liked to use those super performant physics objects with how I'm already familiar with using Unity, aka not dots.

[supple sparrow]

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

[strange lark]

What are some good ways to decollide if an actor is stuck between objects?

Some examples, actor in green

Using only the surface normal will not work in this case, since the actor will be pushed back into the other object

[woeful cave]

uhhhhhhhhhhhh delete the actor

[supple sparrow]

Uhm, aren't they because a huge resolution of vertices ?

All unconstrained, appearing as a big black shape ?

Maybe

so, your skirt could be too much high poly ?

[copper inlet]

The higher poly your mesh is, the more performance it takes, especially with cloth physics.

You don't have to edit it, if you can run it, but if you're facing performance problems you probably should edit it lol

[quiet dirge]

The physics on my accessory doesn't work when I load up my model in VSeeFace, any clue why?

they do work when i test them in Unity with the play scene tho

[wispy patrol]

How do I detect that the car is flipped? Do I check the rotation, and if it's on it's side or back for a certain amount of time, then what should I do?

[carmine basin]

Iirc, VSeeFace requires you to export a VRM file to use it, right? You need to use the VRM Spring bones for things like hair and bouncy bones

[supple sparrow]

Many ways to check if it is flipped. I would have used the Dot product (Vector3.Dot()) between the world up and the transform up. But yes you could check rotation, this could be enough. Or even transform.up.y < 0f might be enough (?). I'll let you try what works best for you.
As for "then what should I do", you're actually asking the same question you quote from our previous conversation, so I guess my answer is the same 😉 But again, that's one naive way of doing it as a first try and see if it works for you, more involved way could include Raycasts and other rules to fulfill, as many as need depending on your game 😛

I'd say yes too much for a cloth component. That's your high quality asset I assume ? I'm not an artist but I would assume that the cloth component would be put on a way simpler mesh (like only a dozen vertices) that drives joints for a skinned mesh renderer, but maybe I'm wrong 🤷‍♂️

My next step - as a non-artist needing to catch up - would be to just watch a youtube tutorial, I'm even ready to bet you can find one with a skirt cloth specifically 🙂

and see which mesh resolution they go for

[noble niche]

can someone tell me how can make collider lower Such as The green line drawn in the picture

[woeful cave]

I imagine you just tweak those offset values?

[jovial wraith]

if you edit the physics shape of your tile sprite (in the sprite editor in the sprite import settings) you can use that for generating the collider, then you'll have full control over exactly how it is shaped

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

[crude grotto]

Do you guys have any advise how I can make the force applied to the arm rotate the body as the force travels along the character joints? I thought this should be happening by default😅

the joints break force is unlimited and at higher forces, the arm will just start to glitch rather than rotating the connected rigidbodies. I suppose in reality until a very high force, the body would rotate. Unless its like a .50 cal to immediately tear off the arm

[quiet dirge]

I was told I need to add colliders in order for my gourd's ropes to actually move in VSeeFace, despite them moving in uNity's play scene. What kind of collider do i add, a Dynamic Bone one? I assume I had it to character model,b ut do i add it to the Root, or the place where my gourd is attached, which is the Spine?

[quiet dirge]

anyone?

[quiet dirge]

bump

[supple sparrow]

Uhmmmm, shot in the dark, but is the rb mass way heavier that the arms ?

[crude grotto]

Yes. The rb is 0.8 while the arm is 0.5

[supple sparrow]

Ok you said yes but it's the opposite, pretty close.

Maybe gravity is too much compared to the force you apply

Try applying greater force on the arm, see what happens ?

[crude grotto]

When I do that, the arms joints will start to glitch (jump around the space randomly) before there’s significant impact on the body

[supple sparrow]

Oh yeah that's what you wrote, I immediately ignored that sentence after reading it xD

[crude grotto]

Do you know if that force-transition to the next joints is done utilizing the colliders?

[supple sparrow]

I never tried multiple joint articulated bodies

maybe apply the force to the closest point of the body, to circumvent this force propagation problem entirely 😛

But anyway at first I'd try to stabilize the simulation at rest. It's falling down to gravity in a strange way.

[supple sparrow]

I'd say no (?), it's done through the joint

[supple sparrow]

actually I remember fiddling around some chain thingy and it worked, so I can tell you it's achievable 🙂

[crude grotto]

Because it stutters?

[supple sparrow]

yeah limbs look good but the body is not fluid

[crude grotto]

That’s just because I used some Unity setting to slow it down so I can see better how the rbs are responding to the force while i was /am trying to find a way to make the body rotate with the force 🙂

[supple sparrow]

Using Configurable Joints ? with pretty much default settings or heavily tweaked ?

And how do you apply the perturbing force

[west whale]

Hello, I started working on a vr project and I want to make fluids interact (for example pouring a liquid in another and make them change color) any ideas how I could achieve that?

[raven leaf]

apparently it cilps through the floor

Idk if i can talk about rigidbodies here but

While i want it to fall i don't want it to clip

[wooden parcel]

i have a really basic question. I have a 2d animation from a spritesheet and i'm trying to make polygon colliders for hitboxes on different frames. I created one polygon collider and it allowed me to edit the frames that it is active in the animation editor, but when I add a second polygon collider they appear to be treated as the same thing? I can't edit just one collider at a time, it selects both, and i can't access just one collider's isenabled property. is this something i'm doing wrong or is unity not able to treat two identical components as different?

[wind meadow]

for physics2D.overlapcollider, is there a way to get the objects themselves that came in contact with the overlapcollider?

similiar to Physics2D.overlapcircle

[timid dove]

That's what it does, gives you the objects that overlap the collider

[wind meadow]

ah ok it's just that on the doc it said it returned an int

so i was worried that it wouldn't give back the results array passed in

[timid dove]

Yes read the docs carefully

[wind meadow]

yeah just being doubly sure

[timid dove]

It tells you how many things it wrote to the array

That's what the int means

[wind meadow]

gotchu

that said i guess we can't pass in a list or some datatype that can take in an arbitrary number

[timid dove]

Read the docs

There's a list version

[wind meadow]

ah then apologies

[clear ermine]

so i'm using wheel colliders (fatal last words) and for some reason when I lift off the accelerator and start coasting, my car appears like it's slamming on the brakes.
i've got it printing the motor and brake torques and they are both 0 while the car is locking its wheels skidding to a stop.
has anyone got an idea of a parameter or setting that could by causing this.
the car i'm using is very small and light if that could be causing it (trying to code a small RC car)

[quiet dirge]

Where would I normally put colliders? Right up against bones, over the top of bones, or what?

[carmine basin]

Could you show us your code for this? that'll help us figure out what's wrong

[fluid galleon]

Hello there. I'm struggling around with a certain problem around 2D physics. I'm trying to make vertical-scrolling shot'em up game where player can move around ship, fire at enemies coming to waves, etc. (something like Hybris, Dove, Tyrian 2000, etc.).

In my implmentation, player and enemy aircraft are rigidbodies (2D) as I want them to have semi-realistic collisions if they happen. There is one thing however I cannot figure out how to do. As aircraft is physics based, I'm struggling to make everything to follow scrolling camera. I cannot simply parent aircraft to camera, because physics wont work properly (tried it - parenting makes no effect). Tried to use FixedJoint2D to glue aircraft to camera, and while they now travel with camera, I cannot move ship at all and it looks like its correct behaviour for the joint.

I cannot simply manipulate transforms (because they are rigidbodies), and I cannot use RigidBody2D::MovePosition as it resets ships velocity for next tick.

Also tried to make ships static and only scroll background in opposite direction (instead of moving camera upwards, background moves downwards), but unfortunately this causes massive fps drop, as my background is tilemap and moving it makes unity to recreate & recalculate all coliders within it (300fps down to ~50-60). I think it could mess with culling as well so I ditched the idea.

Is there any way to connect one rigidbody to camera, yet still allowing them to move relative to camera as normal?

[quiet dirge]

Good luck getting help in here, people don't even help with simple things sometimes lmao

[carmine basin]

If you're using VSeeFace, as I already said, you likely need to use the VRM spring bones. You cannot use Rigidbodies for physics in a VRM file

[carmine basin]

The best thing to do would not be to tell people that they won't get help

[carmine basin]

You put colliders on the gameobject that you want to collide with stuff, as anything else. Again, if its for VSeeFace, you need to use the VRM Spring Bones contained within the UniVRM package.

If you want bones of something to collide with something else, then you attach them to the bones

Attaching the collider to the mesh won't do anything when the mesh is deformed

[carmine basin]

There is most likely some kind of tutorial online for this, or people on the unity forum who have come across this and solved it. you can manipulate rigidbody transforms. At least, in 3d I know you can. What happens when you parent everything to the camera?

[fluid galleon]

Spaceship just stays there, its not dragged upwards with camera

Actually I just checked it and now it does for some reason, I think I probably messed up something with programatic parent assignment

[carmine basin]

hm. If you're resetting the velocity of all the ships and such every frame, you could try adding the camera's velocity on top. Like, at whatever speed you're moving the camera, add that onto the velocity of the ships and stuff

so it'd be something like

ship.velocity = moveVelocity + (Vector2.up * cameraSpeed);

just as a rough thing

[fluid galleon]

I'm not resetting velocity, I'm using physic forces to move ships so I cannot touch .velocity at all unfortunately

[carmine basin]

ahh, I see

[fluid galleon]

However I see now that making ship a child of camera actually makes it travel with camera, I probably messed up somehing earlier on

[carmine basin]

You could've just mucked up parenting somehow

it happens, sometimes we just don't parent something when we think we did

[fluid galleon]

Now I did it simply on scene, by hand and when I was testing I was using transform.SetParent from the code, perhaps thats difference, I'll check it out

Yup it works now, I think I might have overlooked something previous time I tried. Its actually a little bit more complicated, I've used the term "parent to camera" as simplification but in reality I've special object called GameRail that "travels upwards" and Camera is child of that object 🙂 Thanks for help @carmine basin 🙂

[mystic walrus]

i have a issue with my game were the player is only able to walk through the main door that takes you to level 2 while he can still move on the ground and walk just fine

[carmine basin]

Sounds like a layer issue. Alternatively, the door doesn't have colliders on it

Check your collision matrix, see if the layer the door is on collides with the layer your character is on

[mystic walrus]

ok

[stuck bay]

You gotta explain way more than that lmao

[solemn meadow]

https://youtu.be/QFrYmmV45Q0

Hi guys, i am having a problem with this script to predict the movement a celestial body will make based on its starting velocity and distance to the sun. Im running the CalculatePoints function in void FixedUpdate(), and the tmpBodies array is an array of TmpBody classes, which contain a mass, position and velocity. This array is just a copy of the actual celestial bodies in game, and also gets updated constantly in fixedupdate(). As you can see in the video, it doesnt work haha. The sliders are updating the starting velocity of the body, but nothing happens to the path, which should change to go around the sun.

Just taking a look at this would make me so so glad because its for a school project and I dont have much time left

[timid dove]

you're making a new positions array for each body every step? Shouldn't that just happen once per body outside the loop for each step?

also when you share code please follow the guidelines at the bottom of #854851968446365696 . It's very hard for me to copy/paste and/or reference specific parts of your code since it's not text and there's no line numbers.

[solemn meadow]

Dude fucking hell man thank you so much man, bruh I can't believe it was this simple lmao. You just saved my grade man ahhhhhhh

I'll keep the guidelines in mind next time :)

[raven leaf]

So i wanted to make objects that can be pushed by the player ( a capsule) as they walk in the game, i used books (for a specific level test) and they have a rigid body but they are too small the player walks over them

i did then make the collised bigger but now it collides with the other books / ground and looks like if it's floating

am i using the wrong way ?

[solemn meadow]

Is your player collider touching the ground?

[raven leaf]

yes it is

the problem is in the books collider as if they flip to the other side they will look like theye are floating

[timid dove]

Using CharacterController or Rigidbody for the player?

[timid dove]

Fix the colliders so they're flush with the model

[raven leaf]

but if i do , the player just steps over the books

i want the player to move the books when he walks

[timid dove]

Can you answer my first question?

[raven leaf]

Rigidbody

[timid dove]

With what collider?

Can you show the player inspector and the code you use to move it?

[raven leaf]

wait

i used an asset from the unity assets store

[timid dove]

Ok well... Maybe that script has a "step over small obstacles" feature

[raven leaf]

using System.Collections.Generic;
using UnityEngine;

public class FirstPersonMovement : MonoBehaviour
{
    public float speed = 5;

    [Header("Running")]
    public bool canRun = true;
    public bool IsRunning { get; private set; }
    public float runSpeed = 9;
    public KeyCode runningKey = KeyCode.LeftShift;

    Rigidbody _rigidbody;
    /// <summary> Functions to override movement speed. Will use the last added override. </summary>
    public List<System.Func<float>> speedOverrides = new List<System.Func<float>>();



    void Awake()
    {
        // Get the rigidbody on this.
        _rigidbody = GetComponent<Rigidbody>();
    }

    void FixedUpdate()
    {
        // Update IsRunning from input.
        IsRunning = canRun && Input.GetKey(runningKey);

        // Get targetMovingSpeed.
        float targetMovingSpeed = IsRunning ? runSpeed : speed;
        if (speedOverrides.Count > 0)
        {
            targetMovingSpeed = speedOverrides[speedOverrides.Count - 1]();
        }

        // Get targetVelocity from input.
        Vector2 targetVelocity =new Vector2( Input.GetAxis("Horizontal") * targetMovingSpeed, Input.GetAxis("Vertical") * targetMovingSpeed);

        // Apply movement.
        _rigidbody.velocity = transform.rotation * new Vector3(targetVelocity.x, _rigidbody.velocity.y, targetVelocity.y);
    }
}

[mystic walrus]

To go into more depth i made a door to keep my player in the level but said door isnt in a sense physical and gets passed through by my character

[potent notch]

still too vague

[lone quartz]

Is there a way to debug draw an CapsulecastCommand ?

[timid dove]

This package has it built in for CapsuleCast (not capsuleCommand) https://github.com/nomnomab/RaycastVisualization

[lone quartz]

Thank you

[wide pendant]

is it better to use box collider for the head and circle collider for the body and legs? (2d)

[timid dove]

use whatever shape you feel fits your character best

[wide pendant]

in that case

is it bad to have 3 colliders

[timid dove]

no

[unique cave]

Your CPU will most likely explode, be careful with that...

[timid dove]

Yes if you're using a binary computer it can't count to 3, so it will explode on the third one.

[potent notch]

wondering if anyone that has used nvidia flex would mind giving me an example script on how to get triangle meshes working, or something like that? (i know the manual does say how to do it, but i just cannot get it to work properly, sorry lol)

[copper inlet]

Flex working also kind of depends on the Unity version of which you're using. Some newer ones don't support everything.

[potent notch]

ah im not using the flex plugin, im creating a hopefully better version using the dll, clangsharp and a bit of luck

[copper inlet]

And if you're using my Flex rep, some of the things in there might be outdated and won't work with every part of the docs

Ah.

Can't help then, I guess. But I wish you luck lol

[potent notch]

thanks lol

[drifting flare]

Can anybody help me with Physics.Overlap or Physics.ComputePenetration

[bleak umbra]

https://dontasktoask.com/

[hardy gazelle]

As you can see I don't have animations just for this character - just the standard mixamo stuff for testing and i wanted to know if i can seperate the arm colliders to only affect arms and thigh colliders to only affect the bottom of the kimono. Also wanted to ask if there is a way so the sleeves dont roll back and always stay down (second vid)

[high dagger]

I want to connect a clothing model to the skeletal structure of the character in-game. Normally, I make things like sword and hat directly as child object of the relevant bone, but when it comes to clothes, it concerns more than one bone, there is no proper resource on the internet, can you help?

[timid dove]

in those cases the clothing itself is typically also a rigged skinned mesh using the same skeleton as the character model itself

[high dagger]

Thanks, I will try.

[sharp umbra]

I graphed how long a cube took to stop on a flat surface. https://docs.google.com/spreadsheets/d/1s6b4xnqbo-ORcMikkucjH510hzQvtfMaeY4c8wowCAg/edit?usp=sharing

In an ideal world this would look like a perfect staircase where each step is the height of your fixed update interval, but as you can see it's not. I believe this is because physics is on a separate thread and jobs don't get done perfectly in sync.

Moral is the story, is that even in ideal controlled physics situations, your expected result could be a frame off.

[timid dove]

I think this might have more to do with floating point precision issues, such as the fact that your chosen timestep is not perfectly representable in binary

[sly cliff]

Am I going to have to code like a whole physics engine thing if I am aiming to make a vr game like bonelabs/blades and sorcery?

[timid dove]

No, Unity already has a physics engine

[drowsy parcel]

why my car box collider looks like this?

oh wait

im dumb

why when i start the game car falls through that red thing

why when my wheel colliders were so giant

there is 0.011 radius

and its still big

[timid dove]

because your car's scale is (100, 100, 100)

[drowsy parcel]

i have a problem

when i start the game

my back left wheel collider

just

flies away

UpdateWheel(FrontLeft, FrontLeftT);
UpdateWheel(FrontRight, FrontRightT);
UpdateWheel(BackRight, BackRightT);
UpdateWheel(BackLeft, BackLeftT);

i figured out that it does this because of the script

but why

i had this script before

and it worked

[potent notch]

wondering if anyone who has or hasn't used nvidia flex before would mind trying to explain to me how on earth GetContacts() works? In the demo app i managed to find an example of how to use it, but by replicating that as best as i can in c# it doesn't appear to work for some reason https://github.com/NVIDIAGameWorks/FleX/blob/master/demo/scenes/triggervolume.h

oh and this was my c# replication btw: ```cs
for (int i = 0; i < Container.SlotsUsed; i++)
{
int ContactIndex = Container.SBuf.ContactIndices.data[i];
uint Count = Container.SBuf.ContactCounts.data[ContactIndex];

        for (uint c = 0; c < Count; c++)
        {
            Vector4 Velocity = Container.SBuf.ContactVelocities.data[ContactIndex * 6 + c];

            int ContactShapeId = (int)Velocity.w;

            if (ContactShapeId == ShapeIndex)
            {
                Debug.Log("Collision!");
            }
            else
            {
                Debug.Log(ContactShapeId);
            }
        }
    }

[potent notch]

ok turns out i wasnt grabbing the data properly, whoops lol

[drowsy parcel]

Could someone help me with drift physics, just some tips please

[potent notch]

assuming you mean drift as in vehicles (such as cars, and not canoes, although could you drift in a canoe? Sounds fun to try...) this may help https://en.wikipedia.org/wiki/Drifting_(motorsport)#Drift_tuning

[drowsy parcel]

yeah vehicles

[drowsy parcel]

thanks

[broken rover]

Hey there! I'm incredibly new to Unity so I have a very beginner problem that I'm dealing with that I hope you could help me with...

So basically this player capsule that was included in the Third Person Starter Asset Package from Unity won't function properly I think? The collider seems to match with the capsule but for some reason it goes through the platform and interacts with the platform as it's using the top mesh for reference. How do I fix this?

[timid dove]

Why do you have two colliders

[broken rover]

I have no idea. I think it came like this

[timid dove]

I don't think so

[broken rover]

Okay, so how do I remove one of them?

[timid dove]

It works properly out of the box

[timid dove]

I'd recommend just starting fresh

From the asset

Redownload the starter asset

Delete and redownload

[broken rover]

Okay, thank you!

I think I managed to undo my changes without having to reinstall everything! phew

It works now :)

[limpid condor]

Hello, guys! I am experiencing a strange problem, so the problem is that when I play the game the rover's tires fly away. I've added a wheel colliders to all wheels and I've made a rigidbody to the whole model. Please be easy on me 😄 I started 2 days ago

[shrewd umbra]

hey guys, i already sent this message in general but i think this is a more appropriate channel for this, does anyone know a good way of making a suspension system for a dirtbike? im talking about 2d and i have these parts for the bike

the whole bike looks like this

And i wanna make it similar to this game

[unique cave]

Wheel Joint 2D alone could be enough to make the wheel/suspension

[shrewd umbra]

yeah im trying that rn

but i have a problem

[shrewd umbra]

the green is where i have the hinge joint connected from the wheel to the like tube thing so the wheel can actually spin, and the blue is where i have connected the tube thing to the whole bike with a fixed joint

but now the suspension at the front doesnt work

idk how to explain it

i wanna make it so the tube thing is in one place and the bike like goes into it

like in the video

[shrewd umbra]

.

i've got this now

but i need the tube to stay still

dont know how to do that

[unique cave]

Do you use wheel joint for the front wheel?

[shrewd umbra]

no i use a sprint joint

for both

[unique cave]

Why not?

[shrewd umbra]

spring*

[shrewd umbra]

i had problems with the wheel joint

and i find the spring better

i need this tube to stay in rotation with the bike frame but not be attached to it

if you get what i mean

so the front of the bike can actually go down

[unique cave]

I dont

[shrewd umbra]

i dont either tbh

[unique cave]

That ”tube” doesnt affect the game in any way other than the visuals, you could just code it to stay in place

[shrewd umbra]

yeah but there has to be a way to make it stay in one place through the editor

[unique cave]

I dont see why there would need to be a way

Just code it

[shrewd umbra]

i've done this

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Stay : MonoBehaviour
{
    public Transform bike;

    void FixedUpdate()
    {
        gameObject.transform.rotation = bike.rotation;
    }
}

but now it wobbles like a jelly

wait no

it still doesnt work

i had the rotation z freezed

[unique cave]

For example: 1) make the tube origin be at the wheel attatchment point 2) set tubeTransform.position = wheel.position every LateUpdate (so that the wheel side end is on the correct position) 3) set tubeTransform.up = target.position - wheel.position where target is a position on the bike body you want to make the tube face towards (you can make an empty object somewhere here ⬇️ be parent of the bike tar works as the target)

[unique cave]

Is that really using wheel joint?

[shrewd umbra]

spring

joint

for both wheels

[shrewd umbra]

dont look at that

i accidentally freezed the z rotation

thats why

[unique cave]

🤦‍♂️ Man, you have been told multiple times to use the wheel joint, its designed specifically for wheels with suspensions and will make it million times easier to get this working

[shrewd umbra]

with the problem that i have here

it doesnt matter which joint i use

if its spring

or wheel

[unique cave]

But to get the wheels working, you must use wheel joint

[shrewd umbra]

the wheel is working

the suspension

but not the connection

between the tube and bike

[unique cave]

So what it looks now?

[shrewd umbra]

gimme a sec

so the bike_suspension aka the tube is connected to the wheel at the bottom with a hinge joint, i also connected it now to the bike_frame with a fixed joint so that it doesnt have any suspension and now and acts as a part of the frame

it now looks like this

but i need it to look something like this

i dont know what to do lol

[unique cave]

So the problem is?

[shrewd umbra]

i dont know how to make it look something like that

[unique cave]

By using wheel joint?

[shrewd umbra]

alright

fine

lets use a wheel joint

how do i attach it

from the wheel to the frame?

[unique cave]

Yes?

[unique cave]

Does the physics part work now?

[shrewd umbra]

wdym

ye it wobbles like a jelly

but its not supposed to

its supposed to just go down

and up

but it also goes from side to side

[unique cave]

Well, actually now you have two joints on the wheel?

[shrewd umbra]

wdym

the tube is attached to the wheel

so that the wheel can spin

with a hinge joint here

and the wheel is attached to the frame of the bike with a wheel joint

but the tube isnt attached to anything now execpt the wheel

thats why it spins around

[unique cave]

Try not to attatch it to anything. You shouldnt really use joint for the tube

[shrewd umbra]

not even the wheel?

[unique cave]

No, you can code the position to stay correct

[shrewd umbra]

alright

now it just drops out of the map

what next

[unique cave]

Now make sure the wheel joint is working properly

[shrewd umbra]

ill show u

[shrewd umbra]

it doesnt just go up and down

it wobbles to the side as well

[unique cave]

Afaik the wheel joint suspension should only allow movement along the axis defined by the angle parameter

Its really hard to tell from that video. You could make the spring more loose to make it more clear

[shrewd umbra]

alright

i just set the angle

so its like going up the tube

115 degrees

ill send a vid

i made it loose

[unique cave]

Why the backwheel seems to work much better? Does it use wheel joint too?

[shrewd umbra]

spring

[unique cave]

Ah

[shrewd umbra]

but i just changed it to wheel now

its the same

both are wheel

i've just realised something

ill show u

i've had the wheel connected to the frame

instead of having the frame connected to the wheel

so the anchor moved with the wheel

thats why it wobbeled

i'll record a quick vid and show you what it looks like now

i've disabled the back suspension for this clip

to see more clearly

heres the same vid but with more loose front suspension

it works now

but i just need to make the tube stay in place

and not fall of the map

can u help?

[unique cave]

Remove the rigidbody and try these steps <#⚛️┃physics message> (I really gotta go sleep now)

[shrewd umbra]

alright

thank you

i was thinking this

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Suspension : MonoBehaviour
{
    public Transform middleFrontWheel;
    public Transform bikeFrame;

    private void FixedUpdate() 
    {
        gameObject.transform.rotation = bikeFrame.rotation;
        gameObject.transform.position = middleFrontWheel.position;
    }


}

the Transform middleFrontWheel is the middle of the wheel

just an empty game object

and i removed the rigidbody from the tube

[unique cave]

I still really think the wheel joint should be attatched to the wheel and the connected body should be the frame, that starts mattering when you start using the motor to rotate the wheel. Now that I check your hierarchy closer, I think the wheels shouldnt be child of the body because that will mess up with the physics, the frame and the wheels should be independent objects (hope that was it, and now I will go sleep, ill be back tomorrow)

[shrewd umbra]

okay thx

[glacial notch]

I'm newish to Unity, can the built-in physics support acceleration in collision detection calculations accurately?
as opposed to like using simple arithmetic to += or -= the speed, which makes instant changes to speed values that can result in skipping obstacles that would otherwise be hit if the projected player path was calculated including the acceleration throughout the path (as opposed to at the start/end of the calculation)

not sure if that makes sense, lmk if I can clarify

or would achieving the above require editing the physics system or making your own from scratch?

[bleak umbra]

you need to define what qualifies as accurate enough in the your project. No incremental simulation can be perfectly accurate. That said, Unity physics (PhysX) has various collision detection modes that you can play around with to tune accuracy and performance to your needs

[glacial notch]

so the limit would be the forces/accelerations, but I'm trying to get their effect on velocity to be continuous, as opposed to what I've seen as the common approach where per-update accelerations are added/subtracted as opposed to being part of the projected path calculation

so like in the delta between two physics updates, the acceleration/deceleration should not be incremental/discrete, it should be part of the equation, idk if that in math requires like a higher order equation or not but yeah

I'm not sure if built-in Unity physics is capable of this

[bleak umbra]

unity physics will check for collisions between the current and last step

but it will not take acceleration into account, it will just assume a liner path

[glacial notch]

ah and it's impossible to make it a non-linear path?

or like, not practical / Unity's built-in physics doesn't readily support it?

[bleak umbra]

its completey unnecessary for game physics

if you need more accuracy, lower the time step

[glacial notch]

I'm trying to make a competitive very fast-paced 2D game, and I'm trying to implement more accuracy instead of just a linear path in collision detection to account for potential inaccuracies present when between two steps much more significant changes in position can happen

[glacial notch]

so like 120 per second? as an example

[bleak umbra]

whatever fits your definition of accurate enough

[glacial notch]

hmm I see, and this is probably better than changing physics to account for non-linear paths in collision detection?

in terms of performance etc

[bleak umbra]

if you make a competitive game, you should probably not use the default simulated physics

[glacial notch]

how come?

are there some other problems that come with default physics, if I turn up the physics steps per second?

[bleak umbra]

its not really meant to produce accurate gameplay

[glacial notch]

what are some/any of the more significant compromises it makes that may negatively affect competitive games seeking accuracy?

[bleak umbra]

unity physics are inherently non-deterministic

[glacial notch]

hmm I see

are there any popular packages you might happen to know of or anything you suggest for a good replacement, that is deterministic and meant for accurate gameplay? (instead of like writing another physics system from scratch, I assume that's a lot of work) - or any resources that have information on this

[bleak umbra]

its also difficult to tune the game feel when using built in force simulation

you havent explained what your game is

its impossible to make any suggestion

[glacial notch]

2D platformer like brawlhalla/smash bros but bigger maps & more players, very fast-paced, tile-based

[bleak umbra]

also consider that you are likely overdoing it

and actually builtin default physics are plenty accurate for your needs

[glacial notch]

I'm remaking another 2D game that had a very high skill ceiling and was very fast-paced, where many players complained and suffered from shoddy physics etc, so a focal point for me is to make physics here really good if possible - for a reasonable amount of effort

[bleak umbra]

then certainly don't use builtin physics

you can try using havok or making a custom simulation

[glacial notch]

custom simulation meaning like from scratch? (probably not too big of a deal for a 2D platformer)

[bleak umbra]

meaning you simulate exactly for the accuracy you need and specific to your game

[glacial notch]

would havok thus count as a tool that allows for custom simulations, or do custom simulations require you to write your own physics math from scratch for collision detection etc?

[bleak umbra]

you can still use the physics API, but you replace stuff thats too imprecise for your taste with a better solution

[glacial notch]

ah I see

[bleak umbra]

havok is just a different physics engine that unity can use (built-in is PhysX)

[glacial notch]

hmm I think before anything I'll check out havok then

otherwise with the help of the information you've provided so far I think I'll probably be able to find some pointers for learning to make custom simulations, but on the off-chance you wouldn't happen to know of any learning resources that teach or help with that?

[bleak umbra]

generally nobody does custom physics because its just way too hard to do

[glacial notch]

right, makes sense, I was thinking the same, albeit probably not the craziest deal for 2D platformers

[bleak umbra]

in a 2D game like you describe the typical approach is to not use the builtin sim physics and just implement a kinematic controller for all pawns

with custom collision detection and possibly custom de-penetration

[glacial notch]

interesting

[bleak umbra]

this would be the best controller base you can currently find: https://assetstore.unity.com/packages/tools/physics/kinematic-character-controller-99131

and the Entities variation of it https://assetstore.unity.com/packages/tools/physics/rival-dots-character-controller-for-unity-225129

[glacial notch]

I remember someone else mentioning it and I checked some videos out about it, do kinematic controllers necessarily or generally involve more complex non-rectangular hitboxes which interact internally for player characters? like limbs having their own physics instead of just a rectangular hitbox for the whole character

I'm thinking to stick with just a rectangular body & hitbox etc for the player characters as in the original game

[bleak umbra]

you can do whatever you like

[glacial notch]

fair enough

I'll check out more on kinematic controllers as well, and the reasons for their usage

[bleak umbra]

typically you have multiple rect or spherical hitboxes

but that depends on your game design

[glacial notch]

as opposed to a single one for an entire character/entity?

[bleak umbra]

a fighting game typically has a custom box for each attack

[glacial notch]

to match the animations essentially?

[bleak umbra]

typically animations and boxes have little correlation

its more about timing than shape

[glacial notch]

yeah I feared that might've been the case, but nonetheless essentially not just a rectangular hitbox for everything

[bleak umbra]

yes, rectangular box

its much easier to understand for players

[glacial notch]

oh still rectangular? different dimensions for each attack? otherwise, what is exactly a "custom box"

[bleak umbra]

custom dimensions

[glacial notch]

ah alright

I guess boxes inherently are rectangles 😄

fair enough

and... do kinematic controllers involve a different system to PhysX then?

[bleak umbra]

no

[glacial notch]

unrelated?

[bleak umbra]

kinematic just means that you do not use forces

[glacial notch]

hmm, I think I get what you mean

I'll research about kinematic controllers then

[bleak umbra]

built-in forces that is

you can still create your own forces

[glacial notch]

hmm

[bleak umbra]

but you dont use AddForce()

[glacial notch]

so PhysX/built-in physics are less involved, you sub out some components for some extra stuff as part of your kinematic controller code/packages

[bleak umbra]

its all still the same physics engine that is being used for figuring out collisions

you are just not using the builtin simulation

[glacial notch]

does that not suffer from the deterministic/accurate gameplay problems?

[bleak umbra]

well, ofc it does, if you make shitty inaccurate sim, you have the same problem

but you can, in theory, fix all those issues

but you need to understand, you arent doing this to fix the inaccuracy

[glacial notch]

I think I get what you mean, it's more of a step-by-step thing where you just target each individual problem and figure out how to get around it, regardless of how that looks like in terms of using built-in API or adding extra stuff, eventually you'll get something working that is accurate/deterministic enough for a fast-paced game

[bleak umbra]

you are doing this to have more control about the specific things your game needs

[glacial notch]

right right

alright, things make more sense now

[bleak umbra]

game physics will always be inaccurate

[glacial notch]

thanks a lot for all the info! and for bearing with my pedantic questioning, just tryna make sure it all clicks in my brain

[bleak umbra]

determinism doesnt change that

[glacial notch]

I think in theory, thinking about it from a calculus perspective, within certain limits/assumptions you can get effectively perfect physics, much more so than the largely incremental & discrete nature of most game physics. but there are problems of how long that would take to implement and how costly it would be computationally

like you might have to use some cubic or higher-order curve intersection math, differentials and so on, but when a key press is detected within a step, the next step you can then calculate exactly what should've happen in the given time delta

you can even make it efficient by ensuring only some tiles are checked instead of the whole map, as is common for physics engines I imagine

[bleak umbra]

you first need to have a perfect formula that describes your system and that has to take into account the state of all atoms in the universe at each step, which is impossible, so you should just give up on that theoretical idea of accuracy

calculus in itself is terribly inaccurate, its just precise

[glacial notch]

well that's why I say limits/assumptions, in a fast-paced competitive game, it's not reality, you can think of everything being a vacuum or perfect solid, things move with no thrust, they just move, and acceleration can be instantly obtained or lost (i.e. forces) based on key presses

[bleak umbra]

i think you are overthinking all this

[glacial notch]

this is very unrealistic but within these limits it's arguably quite easy to devise a formula that calculates collision detection in a tile-based map etc

[bleak umbra]

you should first prove that there is an actual need to do all this extra work

[glacial notch]

I'm just tryna say it's much simpler, at least what I have in mind, but I guess pumping up the physics steps should be simpler

[glacial notch]

there likely isn't considering the alternatives that you've helped me realize, just wanted to say you could arguably get accurate physics (within limits), but yeah

anywho thanks again!

[dreamy quail]

what do you mean by drives?

ok i got it to work

but it feels....soft

sending vid

been messing around with the settings

it either bounces back and fourth

or feels soft

pls lmk if u find solution

[stuck bay]

how can I make the cube bump into the car like a human

[unique cave]

@dreamy quail id try fixed joint, just an idea. I dont really know if it would actually work

[dreamy quail]

ill try it tomorrow, thanks

[dreamy quail]

https://obsproject.com/

[unique cave]

So the cube should fly away from the car?

In order to achieve that, atleast the car should be moving using a rigifbody. Right after the cube gets hit by the car, you should stop controlling the cube so it can move freely

[dreamy quail]

or, if that doesnt work or interferes with another script, he could release the cube and then add some velocity. that is, assuming he wants the car to stop on impact

[stuck bay]

Ah thanks

:)

[dreamy quail]

👍

also please use obs or game bar

bandicam sucks

[stuck bay]

Yeah I know

my pc is potato

[carmine basin]

You can increase the spring and keep the damper the same, and you can also change the max force. I find that setting the max force to the same number, or a multiple of, of the spring yields good results for vr hands.

[unique cave]

did you try unparenting the wheels and adding the wheel joints to the wheels (and not to the frame)?

[shrewd umbra]

"Bike" is an empty game object

for the back wheel i have to use a spring joint

when i use a wheel joint this happens

look at the green line as the bike rolls

the bike drops down

every 180 rotation

because the green line which is the wheel joint turns with the wheel

[unique cave]

that can't be right, you actually need to add the joints to the frame. I got confused because the tutorial I watched did it the other way around and that seems to be incorrect

[shrewd umbra]

i just sticked with the spring joint

im not gonna use motors anyways

and the way that i have the back wheel set up with the connector there is no way to make it work with the wheel joint

anyway its fine now

im making the movement with rigidbody

and forces

thats what it looks like now

but as you can see the tube is glitching

like it doesnt catch up with the bike

its like teleporting

u know how to fix that?

[dreamy quail]

Oooo, thanks

[carmine basin]

you can also apply drag using the rigidbody settings to help with the oscillation a bit

[dreamy quail]

O ok, thx

[bitter meteor]

I got this quadruped built with articulation bodies. Sometimes the lower legs get stuck in the ground while the rest of the body keeps moving (see the end). What could be the cause of this?

https://gyazo.com/ea71f8f42aceedc16f96d38bce7f967c

The lower legs (including the feet) have collision detection set to continuous

and obviously i never mess with rotation of position manually, its only controlled through xDrive

[carmine basin]

Hm, is that just a plane you're using?

Like, for the ground

[bitter meteor]

Yeah

[bitter meteor]

@carmine basin

[timid dove]

Can you try "continuous dynamic"? I notice your leg movement is largely rotation, I believe continuous dynamic does better with rotational tunneling vs continuous

[bitter meteor]

I've tried it but it still had the same issues

Didnt consider if it was slightly better or not tho

[carmine basin]

alrighty, try using a cube fie the ground instead. Scale it along the x and z axes to make it as big as you need

I find that planes have penetration problems usually

[bitter meteor]

yeah a cube worked way better

thanks @carmine basin

shame though

https://gyazo.com/e9d750dee0a4f554a265d7520a50553c

can i increase the physics steps per second or smth to make the simulation run "smoother"?

still getting a lot of impact forces

[timid dove]

yep - Project Settings -> Time -> Fixed Timestep

if you make that smaller you'll get smaller physics timsteps

[bitter meteor]

Cheers ill try it out

[carmine basin]

Alternatively, if you want to make it bounce less, is there some kind of damping?

[bitter meteor]

@carmine basin you mean on the articulationbody joints?

There is damping but of course i have no idea if my joint parameters are reasonable or not

I barely know what the damping parameter actually does

[carmine basin]

I've never looked at Articulation bodies

can you show me the inspector window for them?

[bitter meteor]

those are not the actual values im using, i am changing them all through code since i got so many joints

@carmine basin

[carmine basin]

Hm, try reducing the x drive stiffness and increasing the angular damping at the top

[bitter meteor]

this is stiffness 3k

problem is that with stiffness too low it will not even attempt to lift itself

[carmine basin]

hm

put the stiffness back to what it was

try changing the angular damping

You could also try reducing the mass too,

[torpid marten]

can someone with a big brain help me out?
I'm looking for a way or formula to apply X force to reach but not surpass a given velocity, my designer brain is can't wrap iteself around it (using rigidbodies)

[timid dove]

Just set the velocity directly

[torpid marten]

that is exactly what I am trying to avoid with this

[timid dove]

why

that's the end effect you want

any math will get you there precisely

[torpid marten]

no, I want it to be able to overshoot the velocity treshold by other forces

[timid dove]

other force applied in the same frame?

or what

[torpid marten]

possibly but others as well

[timid dove]

You need to carefully describe what you want then

[torpid marten]

basically I want an "engine", something that applies force but will eventually stop accellerating at its "limit" (the given velocity), but something like strong wind should still add acceleration to make it go even faster

(sorry for grammar, Im doing my best^^)

a car will reach eventually the max speed limit it can achieve and what im looking for is a way to set this limit as a velocity, without restricting it to that velocity

[timid dove]

Can't you just do something like:

float maxSpeed = whatever;
float currentSPeed = rb.velocity.magnitude;
float diff = maxSpeed - currentSpeed;
diff = diff < 0 ? 0; diff;
float desiredSpeedAddition = Time.fixedDeltaTime * engineAcceleration;
float speedToAdd = Math.Min(diff, desiredSPeedAddition);
rb.AddForce(direction * speedToAdd, ForceMode.VelocityChange);```

basically limiting the velocity change from the engine to the diff between current speed and max speed

[torpid marten]

itll take me some minutes to fully comprehend the code but I think this sounds like the solution Im looking for

my trouble was not understanding the relationship between adding force and the resulting velocity change of that force, making it difficult for me to figure out how to only apply the force needed and not much more

but this seems to be promising seeing that theres an addForce in there^^

[timid dove]

VelocityChange removes all the mystery from that math

you get to ignore everything like mass and time

[torpid marten]

perfect, thank you very much

[potent notch]

trying to create some planetary gravity type stuff with nvidia flex, which means i need someway to += a vector3 that will add force in the direction of the center of the planet, i also have each fluid paritcle's inverse mass stored somewhere incase that helps, and this is all being done in the fixed update, anyone got any ideas?

[potent notch]

managed to get it working using some luck

[remote pewter]

This problem has bugged me, is there a good way to prevent ragdoll limbs from trying to "explode" from each ?
when you turn enemy into ragdoll with a raycast ?
Have to disable animator for this to work. I believe this bug is part of penetration recovery

public void ActivateRagdoll()
    {
        foreach (var collider in colliders)
        {
            collider.isTrigger = false;
        }

        foreach (var rigidBody in rigidbodies)
        {
            rigidBody.useGravity = true;
            rigidBody.isKinematic = false;
        }

        Destroy(this);
    }```
I'll try to make video when I can lol

Sad panda 😦 🐼

[warm moat]

Hello everyone, I am currently doing an entry task for a job and i can't figure out how to solve it. I need to make two objects pull towards the point and when they collide with each other - bounce them away and change the colour of a piece where collision occurred. I found out that to change colour object has to have rigid body component, but if i use RB for every small cube, how do i keep them in place? And if i use RB on parent object to keep them together i cant change colour of small pieces because collisions wont register. Please tell me what would be the correct approach here. Thank you!

[tender gulch]

With composite colliders, one way you could do it is get get the object closest to the collision point.

Otherwise you could try using individual(non composite colliders) with kinematic rbs. In this case I'm not sure if there might be an unexpected behavior. Got to test it.

Lastly, you could try linking dynamic rbs with joints and configuring them to hard lock the rbs to each other.

Id also check if some Collision properties perhaps reference the collider that participated in the collision. ContactPoint sounds promising.
https://docs.unity3d.com/ScriptReference/Collision-contacts.html

[carmine basin]

in the collision parameter of the collision events, I think you can get the collider that the object hit. You can then do collider.gameobject or whatever you're doing

[upbeat birch]

There is no way to manually check a collision between a Convex Mesh Trigger Collider and a Box Trigger Collider, right?
I construct a mesh on the fly to find an arbitrary number of selection boxes within it. Documentation insist that OnTriggerEnter requires not only Mesh Collider to work, but a Rigidbody as well. As the result I need to apply two components to a constructed mesh and wait until the next Fixed Update for OnTriggerEnter to fire properly. On the other hand I don't need to iterate over all selection boxes and check for boundaries.

[void blade]

Hey, I have a problem. As soon as I press play, my rigidbody flies away to one side. But in another scene it works fine. So it must be the scene and not the object. The physics settings are ok and I don't have a wind object. What could be the reason for this?

[timid dove]

could be literally anything

a script doing it

an object pushing it

¯_(ツ)_/¯

with no details how could we know

[void blade]

Ah shit okay. I had hoped that it could be something simple.

[timid dove]

it could be something simple, yes

that doesn't mean mind reading is possible

[void blade]

Do you know some simple errors that can cause this?

[inner thistle]

You're not going to solve the problem with blind guesses

Show the code and the object setup

[timid dove]

yep, as I mentioned before:
#⚛️┃physics message

[stuck bay]

How would one approach cross-sectional collision in a 2d project with 3d mesh colliders, kinda like what Getting Over It has?

(assuming this IS how it works)

[tender gulch]

Physics and graphics are not really related. You can have 2d physics with 3d models and 3d physics with sprites. Just make sure they're on the same z position and just use 2d physics components.

[hearty tulip]

hey team, looking for a bit of help. i want to have a gameobject be connectd to another larger on and have it rotate freely 360degrees, then when i rotate it to the postion i want it to ingame i wanna be able to then make it push from the new direction the game object is facing

kind of like a tank turrent would spin freely

[tender gulch]

Does it have to be done via physics?

[hearty tulip]

yes exactly

id like to do be cause there is two outputs

two outputs operating independently

[tender gulch]

Wdym by outputs?

[hearty tulip]

oh sorry im bad at wording things. so im making a boat simulator with two propellers on the end of it one on each corner and i want them to both spin freely and independent from everything else. but when i push my forward key i want one of the propellers to push in the new direction its facing

im very new to unity so i have prob made a very rookie error, more then happy to share my screen with you to explain it better if youre happy to do so

[tender gulch]

Do they need to be spined by physics? So you actually need them to push the boat? Is it a hyper realistic boat simulator?

[hearty tulip]

i would like it to be a hyper relistic simulator one day. but for now i would like them to just turn without effecting anything

[tender gulch]

Then just turn them via transform or something. Don't add rbs to them

And apply the force to your boat instead of the propellers

[hearty tulip]

ahh okay that makes sense. I just want one force to be applied from one corner of the boat and another force from the other end

if you google ASD tug boat it might make sense what im trying to say

[tender gulch]

There's a method for applying force at certain point in the RB. Check the docs.

[hearty tulip]

okay thank you will do. appricate the help

[tender gulch]

Saved you some googling:
https://docs.unity3d.com/ScriptReference/Rigidbody.AddForceAtPosition.html

[hearty tulip]

thanks a million

[frail lagoon]

In the top left corner, you can see if the player is grounded or not

[cerulean kindle]

I'm currently having a strange issue with opening and closing doors on my map, and it seems to be something to do with the box collider. I have it set up so my cursor highlights when something can be clicked on, so you can get a pretty good idea as to how far I need to go into the 'hinge' in order to be able to open and close the door.

I'm hoping someone might be able to assist me in this. With gizmos on, I do see that the Box Collider that I have on is following the path of the door so I'm not sure what's going on.

[timid dove]

Without more details - seems simply like a case that the door collider is now out of range of whatever raycast you're doing after swinging away.

A typical approach here would probably be to have a secondary trigger collider that doesn't move with the door so you can continue to interact with the space where the door used to be after it swings away

[cerulean kindle]

Will my Raycast pick up on the Trigger Collider if it's not physical?

[timid dove]

See the "queryTriggerInteraction" parameter: https://docs.unity3d.com/ScriptReference/Physics.Raycast.html

[cerulean kindle]

It's nothing fancy re: the raycasting.

    // Update is called once per frame
    void Update()
    {
        RaycastHit hit;
        if(Camera.main)
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if (Physics.Raycast(ray, out hit))
            {
                if (hit.transform != null && hit.distance <= 2.5f)
                {
                    if (hit.transform.tag != "Untagged")
                    {
                        Cursor.SetCursor(activeCursor, new Vector2(0, 0), CursorMode.Auto);
                    }
                    else
                    {
                        Cursor.SetCursor(inactiveCursor, new Vector2(0, 0), CursorMode.Auto);
                    }
                }
                else
                {
                    Cursor.SetCursor(inactiveCursor, new Vector2(0, 0), CursorMode.Auto);
                }
            }
            else
            {
                Cursor.SetCursor(inactiveCursor, new Vector2(0, 0), CursorMode.Auto);
            }
        }
    }

Ah interesting, I always skipped over that parameter.

[timid dove]

TL;DR - by default yes raycasts will hit triggers no problem

you'd have to go out of your way to make that not the case

[cerulean kindle]

Okay perfect, thank you. Let me see how this goes.

Yeah looks like that did the trick. I do find it hard to believe that it's super out of range though, I can reach things further than that when I'm looking straight at them.

It just seems like something to do with the Door Frame blocking interaction.

[timid dove]

you can debug your raycast and see if you're hitting something besides the door

[frigid stirrup]

I have a image of a ground, so I used a UI element to position it somewhere, and I have a 2d sprite (square), is it possible to detect if they collide (ping me if you reply)

[timid dove]

Possible? Sure anything is possible.

Practical? No. UI and world space objects don't even live in the same coordinate system

[dreamy quail]

help with rigid bodies

the first 30 secs are oculus being a jerk so u can skip it

the paddle is a rigid body with a configurable join

[dreamy quail]

tried the whole one object continuous and one object continuous dynamic

no fixes

[dreamy quail]

i fixed it

but if i have a bouncy object

it will bounce off the object rather than forcing it forward

only when going fast

[carmine basin]

@dreamy quail What you want is this - bouncy physic material on the ball. The ball bounces, so that makes sense. Do NOT put your physics timestamp on 0.001

*timestep

Instead, go into the physics tab of project settings

and turn up the velocity solver iteration a little bit

if its 6, put it on 8 or 10

And then

on your paddle

turn on Interpolation

[proud trellis]

Does anyone know, why in additive scenes [mirror multiplayer + server], some boxcast/trigger collisions happen only when there's a camera sitting and viewing it? [Yes, I am calling PhysicsScene.RunSimulation]
For a melee weapon, its a 10% hitrate [getting callbacks] on the server if I don't have a camera overlooking the entire scene. 90%+ if I do have a camera.
The camera is doing basically nothing just overlooks the entire scene on the server, I added it because I noticed a behaviour, where my chances of getting a trigger callback increased drastically if the object I'm hitting was in focus in the scene view.

[dreamy quail]

Thank you so much, what settings should I have for the physic material

[carmine basin]

Take a guess

If you want a bouncy material

[dreamy quail]

where?

this?

[carmine basin]

Yeah, turn those up

Regular iterations to 8 or 10

velocity solver iterations to 2

[dreamy quail]

both the solver and the velocity solver or just the velocity

oh

ok

[carmine basin]

what's your fixed timestep?

[dreamy quail]

i reset it to default

[carmine basin]

alright

[dreamy quail]

0.02

[carmine basin]

okay good

[dreamy quail]

ping pong ball mat

still not bouncy enough

[carmine basin]

Put the bounce combine on maximum

[dreamy quail]

only bounces once

[carmine basin]

That'll make it bouncier

[dreamy quail]

i tried, it bounced returning 100% of its energy each time

it bounced off the edge of the world

[carmine basin]

Then lower bounciness, keep it on maximum

[dreamy quail]

ok

[carmine basin]

it's because you have the bounciness on 1

[dreamy quail]

ok

[carmine basin]

Set it to 0.8 to 0.9

should give you fairly realistic behaviour

[dreamy quail]

i set it to 0.6 and it worked ok

but the paddle still phases through at high speed

[carmine basin]

Is the paddle rigidbody set to interpolate?

[dreamy quail]

a little bit of force gets applied but only a little

[dreamy quail]

ill check

o

i turned it off when debugging yesterday

ill test it in a bit, thanks for the help!

[carmine basin]

no worries :)

[dreamy quail]

:)

[balmy raven]

Hello I’m looking for Free GDD template

[dreamy quail]

@carmine basin your fixes are working great :D

thanks

the driver is still a bit wonky

if you have any settings or suggestions feel free to ping me

have a great day

[carmine basin]

@dreamy quail just in case, make sure that your paddle is NOT kinematic

[dreamy quail]

it is not kinetic

[carmine basin]

good

[fluid python]

I have a rip of a mesh of a chain flail and bones associated with it, I want to simulate the chain. What approach can I use to do this and have it attached to a hand.

kinda got it working with cloth component but it wouldnt track the hand and the meshes ball would detach and fall away

[unique cave]

Id try rigidbody for each bone and joints between them

[near scroll]

Trying to use ConfigurableJoints and running into a quite unexpected problem..

Lets consider the above setup

The heirarchy looks like this

Blue and Red cubes are related.
Red is the child, Blue is the parent

Yellow cube is separate and is only used to push the other cubes around

All the cubes have rigidbodies

The blue and red cubes have Configurable Joints

Both joints are configured to allow Linear movement in the Z Axis

You can see the "Range" of motion depicted in the above picture by a red line

and you can see the anchors of the objects depicted by red spheres at the centers of the object

Here you can see the expected movements

The red cube has a smaller range of motion, and drags the blue cube along when it moves further than the limits of their constraints

The blue cube however, acts as a parent. and instead of Dragging the red cube behind it, it hard attaches and maintains the offset between the two cubes

This works fine when moving the objects through the editor

however, consider if the yellow cube is the one trying to interact with these objects

Here you can see the issue..
The yellow cube ONLY PUSHES the blue cube. The red cube stays in its position until the limits of configurable joints are surpassed and THEN it gets pulled by the blue cube

[near scroll]

How can I retain this interaction in this scenario???

I apologize for hogging the chat, the issue was highly specific and I needed to explain it thoroughly

[lavish forge]

⚠️ ⚠️ ⚠️ INEXPERIENCED QUESTION ALERT⚠️ ⚠️ ⚠️
So, i got a parent object with many child objects
Following issue:
I wanna have the child group work entirely as a fixed joint modifier
and i´ve applied it to all of them
and connected my joint modifiers to the parent´s rigid body
BUT everytime i launch the SIM the child parts explode and dont stay in place connected
Any posssible help is totally welcome
(by exploding i mean they seem to clip into eachother and get launched to the shadow realms around the globe)

[viral beacon]

Does anyone know why a capsule rolling on its side as the result of torque accelerates more slowly when its height is increased

I thought it had something to do with the volume of the collider, but when I added a box inside of the capsule that actually made it move faster

all of the rigidbody properties were kept the same in these tests

I hope to use sphere colliders as wheels in a driving game im working on but want to understand why there are differences in behaviour when height changes. I would prefer not to resize colliders at runtime to avoid akward collisions so I would like to understand how to simulate the effect these variations in height have on the simulation.

I wouldnt even mind that much if it were just a slight change in the rate of acceleration but it is rather tramendous just for slightly greater height values.

[worldly dirge]

im trying out unity's ragdoll system, and i have it so that when the player touches the car, it ragdolls. but the ragdoll goes strait through the car

[lavish forge]

Fixed joints?

[worldly dirge]

? (Sorry i dont have much unity experience)

[lavish forge]

Thought you were using the Fixed joints component to do the ragdoll because i too had a similar issue, but if not, cant really help sorry

[lavish forge]

I dont wanna seem desperate but i truly am completely lost on what solution to apply, ive tried everything i could think of but damn it, not getting it

[merry sleet]

Hello! I might bring forward a rather stupid or perhaps even not adapt for this channel type-of question.
I've been working on a small simulation using ants which move on their own and, so far, everything's working great, all except my collision detection script.
I've tried using various methods already but I fail at getting a reliable working one. I've tried the following:

• Using a single raycast in front of my ant and, if a collision is found, find a point on its reflection and move straight to it. This is the one which worked the most, though I have issues in situations where my ant is avoiding an obstacle (with this method) and happens to be on a plain face - this simply makes my ant stop as the reflection becomes a reflection of itself, and on, and on.
• Using three raycasts as sensors and check which one is closest to the obstacle, then avoid by shifting my direction either left/right. This seemed to work but it has great issues as I cannot get my ants to reliably move so quick that they avoid them in time by simply changing their direction, especially in tight spots, where they simply no clip into walls.
  Does anyone have any other idea to face any of these issue? Sorry for the wall-of-text and weird question. Thank you!
  TL;DR: I need a reliable collision-detection which works fine in even "difficult" scenarios.

This is my code for the first solution; and this is basically the issue

[weird drawing i know]
orange is the supposed path; blue is what actually happens.
The ant usually avoids all kinds of obstacles as whenever it finds one, it keeps avoiding until the way is clear.
But in these cases, it is closer to go towards a direction that never leads to a target, and it simply gets stuck there.
Sorry and thanks again for all this stuff that perhaps is just stoopid.

[bleak umbra]

Your algorithm needs to be iterative, ie give agents a chance to react to small changes of the movements of others in the vicinity in order to produce a crowd behavior without glitches

[lavish forge]

Would you by any chance know a solution for me up there? (beginner)

[bleak umbra]

Agents must maintain a minimum distance and be able to stop movement if no valid options exist for them

[merry sleet]

It currently works like that, it checks every frame. The issue is not collision with other ants (which I'm keeping disabled), it is collision with walls and basic pathfinding.
Thx, btw.

[bleak umbra]

There is no difference between avoiding another ant or a wall

[merry sleet]

I get what you mean; you basically think I should introduce some kind of script that in any-case tries to maintain a distance to, let's say, a wall/entity? If so, would you happen to have any idea on how I could implement that?

[bleak umbra]

yes, first prevent collision by stopping then avoid stopping by steering away early

And you don’t need the reflection, just steer to the side of the agent that the obstacle normal points to until there is no more collision detected

[merry sleet]

Mmh I see, I'll try implementing something like that.
Thank you!

[bleak umbra]

I think your reflection logic introduces too much chaos into the behavior which prevents a plausible swarm behavior

[merry sleet]

I see, figuring out that as well. Though it was the only reliable method I had found for some "basic pathfinding"

[bleak umbra]

it certainly makes some sense

but it has too many edge cases

[merry sleet]

Basic pathfinding being something like this, simply it keeps avoiding until a way is clear.

[bleak umbra]

you should not use pathfinding for avoidance

[merry sleet]

Yeah, definitely agree with this. Tight corners for example as well created many many issues.

[bleak umbra]

it’s too expensive for that

[merry sleet]

I was kinda using it for both, as I needed it for other reasons as well.

i was kinda using it the opposite, using avoidance in order for the ants to find a path to a certain target in the map while moving.

[bleak umbra]

use pathfinding to bias your avoidance&steering such that it returns to the path provided there is no obstacle

[merry sleet]

Uh, alright to be fair I have no clue of what that is but perhaps I mispelled it. I'm not using any kind of built-in pathfinding or something, it was just a way I called "ants finding a way to a target". Like, I'm not using any NavMesh or anything.

[bleak umbra]

it’s normal that steering and avoidance get your agents stuck in complicated situations (with many other agents)

[bleak umbra]

a path is just a computed route to a target around static obstacles. Doesn’t matter how you acquired it

it’s just knowledge on how to go from a to b

you use steering behavior to follow such information

[merry sleet]

Ok, ok I understand it. Yeah.

[bleak umbra]

and avoidance to deal with incidental obstacles

[merry sleet]

I'm trying to use simply steering, like a direction that the ant desires to follow

[bleak umbra]

if you want to use ant colony simulation to find paths that is fine, then you just need a way for the ants to communicate their results (scent trails)

this is actually not an efficient algorithm for pathfinding but can look quite interesting when observed

[merry sleet]

Yeah regarding that, I was going to follow into that as well, but I've been getting a lot of issues with avoidance itself, perhaps even stupid issues.

And yeah, I'm mainly going for it to be interesting, not too much for the performance. Tbf, I like ants.

Alright, thank you a lot for your help! I'll try working with steering and avoiding reflections; and probably improve and a function to properly handle some more precise steering.

[bleak umbra]

Ant colonies are great for solving traveling salesman like problems

[merry sleet]

Aye.

[north condor]

Does anyone know which one is more demanding? Rigidbody + OnTriggerEntry/OnTriggerExit vs. Physics.OverlapBoxNonAlloc on FixedUpdate on a setup like this

I just need to check whether the boxes are inside the virtual shelf

[bleak umbra]

You’ll need to profile that

Physics are black box, assumptions are dangerous

In theory the OnTrigger should be more efficient, but maybe not

[north condor]

Yes, this is my current solution

[bleak umbra]

If your do the overlap test incrementally (not every frame and spread out) it can be much more efficient

[north condor]

Ugh.. I don't think I don't want to implement that

I am trying to get every FPS I can get because of the hardware limitation of the HoloLens 2 device

[bleak umbra]

Profile and see if your current solution is good enough

Colliders that don’t move are basically free

[north condor]

When is OnTriggerStay called though? When they move inside?

[bleak umbra]

on trigger is also just the result of an overlap check

But the check is only triggered if the object has moved since the last update, was enabled or otherwise awoken

[north condor]

Ahh okay. That's gonna be messy since I'm tracking real life objects and they might jiggle a bit

[bleak umbra]

well, off to the profiler then

[north condor]

And that's like 21 boxes

[bleak umbra]

idk what performance a holo2 has but it surely can handle a few primitive overlap checks

[north condor]

This is what I see

[bleak umbra]

Maybe reduce the fixed update rate

[north condor]

Under time right?

[bleak umbra]

maybe, it’s somewhere

if you don’t use physics for much else you can slow it down a bunch

[north condor]

Assuming it's this:

[bleak umbra]

Yes

[north condor]

The only thing it affects is the UI I suppose

it's all collider based

[bleak umbra]

yes

and it makes your framerate unstable

but really, profile before you do any of that

[north condor]

I'm not at the lab but I am trying to figure out what else is affecting my performance. Profiler data is portable right? I don't know how to decipher this

Can't recreate my performance issue at home :(

[lavish forge]

So, i got a parent object with many child objects
Following issue:
I wanna have the child group work entirely as a fixed joint modifier
and i´ve applied it to all of them
and connected my joint modifiers to the parent´s rigid body
BUT everytime i launch the SIM the child parts explode and dont stay in place connected
Any posssible help is totally welcome
(by exploding i mean they seem to clip into eachother and get launched to the shadow realms around the globe)

(Sorry for repost)

[worldly dirge]

does anybody have a suggestion?

[worldly dirge]

nvm fixed it

[hearty tulip]

hey guys im just looking for a bit of help im trying to make an asd tug boat simulator. which in short has two propellers at back of the boat which can rotate 360 degrees independently and push one object ( the tug boat) around on diffrent angles ill attach a link to an old game from 2006 which seems to have done it but its not very realistic. thanks.

https://www.youtube.com/watch?v=VPdwKxnMPH8&ab_channel=ASDTugControl

i really am just trying to work out how to have two forces act on one object

[urban rover]

Hey, when using capsule cast, is it possible to get the mid point of the capsule on collision?

[timid dove]

yep

the RaycastHit has a distance property

you do:

rayOrigin + (rayDirection * hit.distance);```

that'll be your capsule's midpoint where it is when the collision occurs

this is opposed to hit.point which is the point on the capsule surface where the collision occurs

[urban rover]

Yea I thought distance was just the length between capsule origin center and hit.ooint, but it's actually the distance the capsule travelled before colliding huh

That's exactly what I need

[near scroll]

I have an object with configurable joint on it. I have also given it its own Layer to operate on
I've set the flags in project setting to make sure that this layer doesn't collide with ANY other layer
Yet somehow for some inexplicable reason, colliders from other layers still mess this object up

whyyyyy

[dawn plank]

you could use a test script with OnCollisionEnter to see what is collidng with the collider

[merry sleet]

Hello! Sorry for another, yet, probably simple question. I've been working on a steering behaviour system (as suggested yesterday by someone I'm very grateful to for sharing all that knowledge) and it's roughly working for now, at least I'm understanding what is going on, though I face an issue (which I already faced before with another system) which is collisions.
My issue is simply my not understanding on how could I communicate to my agent where to go to avoid the obstacle, and more precisely, how to give it the right direction in which to avoid.
I use a "steering" system for the agent movement in which multiple functions contribute in order to get a final velocity value; my avoidCollision does the same thing, but I'm struggling to get it work.

I hope this drawing kinda transmits the message. Thank you. My issue is basically how should I detect where to go after using a raycast there.
A document I've read used the collision body centre as a reference to avoid, but I do not find it viable as my map is an enormous collision shape.

[tender gulch]

Use the hit point as the reference. And the normal of the hit as the avoidance velocity/force.
There could be a case where the normal is exactly opposite to your current movement, which might cause the agent to just stop or keep on going forwards-backwards. You'll need to tackle that case by giving some bias to the avoidance velocity in this situation.

[merry sleet]

That seems feasible. I'll try that, thank you.
In fact, if I've read this well, I could basically use the normal as an avoidanceDirection and simply add it to my velocity from there. Right, thanks again!

[bleak umbra]

Calculate a dot product between the hit normal and your ant’s transform.right direction, if it is positive, turn left, if negative turn right, when 0 you pick a random direction (since then you’d be heading orthogonally towards a wall)

You can use 1 - the absolute value of the dot to drive turn speed based on the acuity of the angle between the ants movement and the collider surface @merry sleet

[merry sleet]

@tender gulch @bleak umbra Thank you both a lot for the info. I never thought about using dot products, I've read up a bit on them and refreshed them in my mind and definitely seem useful. I'll try today and see what I can manage. Thank you a lot again!

[bleak umbra]

The dot is the most powerful tool in gamedev

[merry sleet]

Thinking about it - using the right direction only wouldn't that give issues, considering other cases like if the ant is going vertically, etc-

Very weird drawing lmao
In this case, for example, if I happen to use the right direction of my velocity, wouldn't it happen to give a wrong result (cos would be higher than 0, giving me a positive, but would have to give a negative in order to turn right)

[tender gulch]

In this case the dot product would be positive, so you'll be turning right

[cerulean kindle]

Are you able to specify physics-zones, so one area of the map has lower gravity than the other?

[merry sleet]

Oh yeah it makes sense. I misunderstood it as inverse and though it had to be negative. I'll definitely try this soon

[tender gulch]

Not by default, but you can implement it.

[cerulean kindle]

Well I was trying to make it so one gameObject had no gravity so when it got force applied to it, it would just float away - but that wouldn't work until I eventually just changed the Physics.gravity value.

[tender gulch]

Not if you apply gravity manually

Gravity is just a constant force applied to rigidbodies

You can do it absolutely the same way as unity physics does.

+make different objects receive different force

[cerulean kindle]

Okay so I'd do something like...

gameObject.getComponent<Rigidbody>().AddConstantForce(new Vector3(0f, 5f, 0f) * 5);
yield return new WaitForSeconds(5f);
gameObject.getComponent<Rigidbody>().AddConstantForce(new Vector3(0f, 0f, 0f));

Or would I need to negate that 5f with -5f ?

[tender gulch]

Yes, except that there's no AddConstantForce method.

[cerulean kindle]

Yeah I just saw that, my bad. I see it's a separate component.

[tender gulch]

Depends on what direction you want the gravity to pull.

[cerulean kindle]

So it'd just be a case on enabling/disabling that component

[tender gulch]

No. I was implying just regular AddForce.

Rigidbody.AddaForce.

[cerulean kindle]

int i = 0;
while(true && i <= 100) {
    yield return new WaitForSeconds(.1f);
    gameObject.getComponent<Rigidbody>().AddForce(new Vector3(0f, 5f, 0f));
    i++;
}

I could do something like that then

[tender gulch]

There's nothing special about gravity. It's just another force applied to a body.

[tender gulch]

You should apply it in fixed update if you want it to be correct.

[cerulean kindle]

Would it even need to be in a coroutine at that point if I used FixedUpdate instead

[tender gulch]

It can't be physically both in a coroutine and a fixed update.

You could make the coroutine yield till fixed update if you really wanted it, but I'd just suggest using the update. There's no benefit in using a coroutine whatsoever.

[cerulean kindle]

public class ItemLevitation : MonoBehaviour
{
    int loopCount = 0;
    Rigidbody rigidBody;
    void Start()
    {
        rigidBody = GetComponent<Rigidbody>();
    }

    void FixedUpdate()
    {
        if(loopCount <= 100)
        {
            loopCount++;
            rigidBody.AddForce(new Vector3(0f, 0.2f, 0f));
        }
    }
}

Basically I can just attach this component to any object, and in a separate controller add and remove this component as needed in a co-routine.

If for whatever reason the separate controller fails to remove the component, at least there's a hard-check in place to make sure items don't float in the sky forever.

[tender gulch]

Didn't you want to have gravity zones initially?

[cerulean kindle]

Yeah I did but ultimately it's an AI that's causing things to 'levitate', but I just target it per-item instead of per-room/zone.

[tender gulch]

Maybe something like this?

//Fixed update
rigidbody.AddForce(CurrentGravityZone.GetGravity());

Then you can set the gravity zones on trigger enter/exit.

Would be easy to resize them in the scene view.

And if there's no gravity zone, apply default gravity.

[cerulean kindle]

That might be a better idea.

Do I need to do anything to make the FixedUpdate() start working once I add it to a gameObject dynamically?

    void LevitateNearbyObjects()
    {
        Collider[] c = Physics.OverlapSphere(transform.position, 3);

        foreach(Collider collider in c)
        {
            // Only levitate things if it has a rigid body.
            if(collider.gameObject.GetComponent<Rigidbody>())
            {
                collider.gameObject.GetComponent<Rigidbody>().isKinematic = false;
                print(collider.gameObject.name + " is marked for levitation");
                ItemLevitation itemLevitation = collider.gameObject.AddComponent<ItemLevitation>();

                StartCoroutine(ResetObject(collider.gameObject, Random.Range(5, 10)));
            }
        }
    }

    IEnumerator ResetObject(GameObject gameObj, float time)
    {
        yield return new WaitForSeconds(time);
        print(gameObj.name + " has stopped levitating");
        Destroy(gameObj.GetComponent<ItemLevitation>());
    }

public class ItemLevitation : MonoBehaviour
{
    int loopCount = 0;
    Rigidbody rigidBody;
    void Start()
    {
        rigidBody = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update()
    {
        if(loopCount <= 100)
        {
            loopCount++;
            rigidBody.AddForce(new Vector3(0f, 1f, 0f));
        }
    }
}

Seems to be firing but nothing is happening. Not sure if I need more force

Tried with Update() and FixedUpdate() hmm.

[tender gulch]

I don't see any of the updates in your code.

Ah, ok. I see it in update at the bottom.

You, should avoid this kind of checks. That's only gonna work for 100 frames. Besides, AddForce need to be applied in the fixed update.

Also, it's probably need to be in acceleration mode, since you want the same force to be applied regardless of object mass.

[lucid obsidian]

I'm a bit stuck on the physics 2D materials

my problem is basically this

The bullet also has a bounciness of 1 since I'm hedging my bets

[tender gulch]

How are you moving it?

[lucid obsidian]

In the void start

//Set initial movement vector
        Motion = transform.TransformDirection(Vector3.right * velocity);
        rb.velocity = Motion;

velocity is a vector 3 assigned by the gun thats basically direction gun is pointing at 25 speed

[tender gulch]

Hmm

What collider does the bullet have?

[lucid obsidian]

weirdly if I tell it to

Destroy(this.gameObject);

on contact with the wall using a private bool and allow it to bounce before the destruction code can trigger

it will bounce perfectly on the times its not destroyed

Bullet is using a circle collider 2d

[tender gulch]

How do you allow it to bounce before destruction?

If it's called on collision it should be destroyed the moment it collided.

[lucid obsidian]

Just making the collission check less accurate by messing with the istrigger variable

[tender gulch]

🤔

[lucid obsidian]

this is my whole update

private void Update()
    {
        //Break if hitting terrain
        if (Collide())
        {
            Instantiate(hitSound, transform.position, transform.rotation);
            Destroy(this.gameObject);
        }

        if (InPlayer())
        {
            col.isTrigger = true;
        }
        else if (Collide())
        {
            col.isTrigger = true;
        }
        else if (Mirror())
        {
            col.isTrigger = false;
        }
        else
        {
            col.isTrigger = true;
        }
    }

collide is a collision check for the black walls

if I remove the bottom thing controlling the trigger and just leave it on, and change the mirror walls to the regular wall materal

its about 33/66 that it bounces perfectly or gets destroyed like it should

[tender gulch]

Is it a trigger initially?

[lucid obsidian]

yes

[tender gulch]

Then how do you expect it to bounce?

Triggers don't collide with things.

[lucid obsidian]

because it stops being a trigger if Mirror() which is a private bool checking if its touching the mirror wall

besides if that were the case it would go right through

[tender gulch]

Well, you can t expect it to start behaving normally if you switch it to a collider in the last moment.

We don't even know what moment that is. It could be before or after the "collision"

[lucid obsidian]

If I change it so that its a trigger when touching the player and not a trigger the rest of the time the issue persists totally unchanged

[tender gulch]

What's the point of having it as a trigger anyway?

[lucid obsidian]

to stop it having physics interactions with the walls meant to destroy it

right now its doing the 1/3 chance of bouncing perfectly off the walls that its meant to be destroyed by

[tender gulch]

Why not destroy it on collision then? What does it matter if it interacts with them or not if it's destroyed?

[lucid obsidian]

because I want some walls to reflect it and some to destroy it

[tender gulch]

You can check that in the on collision method

I don't understand why you're making it more complicated than it has to be..?😅

[lucid obsidian]

It was the simplest solution using the code I've learned so far

still don't understand why it would bounce of one wall and not another

even if I literally copy paste the wall it bounces off

it won't bounce off the copy

and it I remove the code telling it to destroy itself it also won't bounce

[tender gulch]

It's probably a timing thing due to how you're doing it and there are probably many factors affecting it, like position, direction velocity speed, etc...

[lucid obsidian]

so how would I run a collision method for each type of wall?

I gave em each different layer masks which is how I've been differentiating them

[tender gulch]

Just check the colliding object in OnCollisionEnter

[lucid obsidian]

I'll give that a try

[tender gulch]

You can check the collided object layer if you want.

[lucid obsidian]

I don't really see where to define a specific object or layer using oncollisionenter

would it be the second text here? "(Collision2D collision)"

[tender gulch]

Check what properties of Collision2D

[lucid obsidian]

Ok I re-wrote to this

    private void Update()
    {
        if (TouchPlayer())
        {
            col.isTrigger = true;
        }
        else
        {
            col.isTrigger = false;
        }
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag.Equals("Terrain"))
        {
            Instantiate(hitSound, transform.position, transform.rotation);
            Destroy(this.gameObject);
        }
    }

its definetaly a lot cleaner but I'm back to square 1

when hitting the non-killy wall it still won't bounce

what it seems to be doing is losing all X velocity then sliding up or down with whatever Y velocity it had at the time

Ok

it seems to be the platform effector

it makes things only bounce off horizontal surfaces but not walls

Thanks for letting me know theres a collision method

gonna save me a lot of pain down the line

[oak crystal]

So I'm currently having trouble implementing knockback. My goal is to have the player be knocked back in a curve using forces instead of position changes and to have the player still be in control of horizontal movement while being knocked back. I currently have the player being knocked back using MoveTowards desired positions on the curve but doing it this way the player will move through walls and can't move while being knocked back. Any ideas on how to do this?

    {
        knockback_r = StartCoroutine(KnockbackSequence(knockback, knockback_location));
    }

    private int numPoints = 75;
    private Vector3[] positions = new Vector3[75];
    IEnumerator KnockbackSequence(float knockback, Transform knockback_location)
    {
        //calculate p0, p1, and p2

        float horizontal_enemy_distance = knockback_location.position.x - rb.position.x; // horizontal vector distance from player to enemy
        float vertical_enemy_distance = knockback_location.position.y - rb.position.y; // vertical     ^


        Vector3 p0 = rb.transform.position;
        Vector3 p1;
        Vector3 p2;

        p1 = new Vector3(p0.x + ((1) * (-horizontal_enemy_distance / Mathf.Abs(horizontal_enemy_distance))), p0.y + (1) );
        p2 = new Vector3(p0.x + ((2) * (-horizontal_enemy_distance / Mathf.Abs(horizontal_enemy_distance))), p0.y + (1 / 4) ); //dividing horizontal distance by the absolute value of itself gives 1 or -1
        

        for (int i = 1; i < numPoints + 1; i++)
        {
            float t = i / (float)numPoints;

            desired_position = QuadraticBezierPoint(t, p0, p1, p2);

            rb.position = Vector2.MoveTowards(rb.position, desired_position, 1);
            

            yield return new WaitForEndOfFrame();
        }```

here's my current knockback code

[near scroll]

Man I so so so wish Unity had better documentation for ArticulationBodies and Configurable Joints

I mean.. What the hell am i supposed to infer from this. This is the sort of answer I'd write in a test if I didn't know how to explain what was asked

"where do you live"
"Beside my neighbour"
"where does your neighbour live"
"Beside me"

if someone could please explain the difference >.< I tried getting a feel for it by adjusting the values, though i'm not sure I understand

[quartz wyvern]

for the life of me i can't figure out why my raycast wont hit my gameobjects

i debugged the ray it hits it perfectly, they are on a layer that my layer mask is selected to

but still it wont detect a hit

if i remove the layer mask it hits everything

but i just want it to only hit these items on a specific layer and it will not work

[bleak umbra]

Show the code of the raycast

[quartz wyvern]

        ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        if (Physics.Raycast(ray, out RaycastHit h, _layerMask))
            Debug.Log(h.transform.name);

debug never happens

[bleak umbra]

show the _layermask field

[quartz wyvern]

and the object im trying to click

if i remove the layer mask it hits them but also everything else

so the layer mask is the problem

proof here

unless unity has some bug i dont know about

[bleak umbra]

looks all good to me

[quartz wyvern]

yeh must be a engine bug then

ill have to report it

[bleak umbra]

Certainly not a bug

you are doing something wrong that’s not yet on your radar

[quartz wyvern]

if i select Everything for the layer mask it selects the blue crystal

but if i specifically set it to the layer that the blue crystal is on

it wont ever hit

[bleak umbra]

I believe you

[quartz wyvern]

let me try a different collider to capsule

ok its a bug its fixed

and now i know for sure its a bug

if you use user layer 3

it don't work

but any other user layer it works

🤔

now its hitting everything with a custom layer

let me restart unity its bugging

[bleak umbra]

Could you add a float.maxValue to your raycast as distance?

I think you are using the layer mask as distance

and never actually specify a mask

[quartz wyvern]

omg you're right

i just checked

didn't realise LayerMask has implicit conversion to float

thats annoying as hell

thing is i dont want to set a distance

[bleak umbra]

The problem really is that all the parameters have default values and you never notice that you omit the layer argument

[quartz wyvern]

yeh its taking the layer mask as a float

so its assuming its distance

and taking the wrong overload