⚛️┃physics

[timid dove]

decreasing acceleration implies that you are still increasing speed, just with a slower increase.

unless/until the acceleration becomes 0 or negative

[hexed violet]

Question

Does GetRawAxis return -1, 0 and 1?

only

Hm.... the ship won't move, I am trying to figure out what's missing

Ah, I see

[tropic trench]

Ok im gonna ask again, because I really want this to work. Is there any reason a raycast would work differently on windows VS. linux? I have a system that im trying to make to pick up items in my game, for some reason, when I make a raycast at the exact same position (as in "Ray Created: Origin: (401.40, 3.38, 420.94), Dir: (-0.15, -0.37, 0.92)"), it works on two different windows machines, and my editor, but not on linux. any reason why? btw my ray IS still hitting stuff, just not what i expect. if i cast the same ray beforehand without filtering, it hits stuff, just never hitting the item that im trying to grab... maybe there is a way to render a ray in the game? that would be useful for debugging this lol
Here's the code

public void Pickup_Pressed(InputAction.CallbackContext ctx)
{
    Debug.Log($"Pickup Press: {ctx.performed}");
    if (!ctx.performed)
        return;

    RaycastHit hit;
    Ray ray = main_camera.ScreenPointToRay(Mouse.current.position.ReadValue());

    Debug.Log($"Ray Created: {ray.GetPoint(0f)}, {ray}");

    Physics.SyncTransforms();
    if (Physics.Raycast(ray, out hit))
    {
        Debug.Log($"[Test] Ray Hit An Object: {hit.transform.gameObject.name}");
    }

    Physics.SyncTransforms();
    if (Physics.Raycast(ray, out hit, inventory_grab_range, mask)) // Do a Raycast with only layer 8 (Items)
    {
        Debug.Log($"Ray Hit An Object: {hit.transform.gameObject.name}");
        Transform hit_transform = hit.transform;
        GrabItem(hit_transform.gameObject);
    }

    Debug.Log("Cast Attempts Done.");
}

the first print always runs, and the second one, and the third one, but not the fourth

[hexed violet]

thank you very much @timid dove

Taht scipt you shared helped me a lot

[ebon scaffold]

https://www.youtube.com/watch?v=lRv7HPWlV7c

So I've been playing around with Unity Marbles but

why are they so slippery?

its like their rotation velocity is clamped, so when I go super fast, the marbles still rotate slow is what I mean

even tho I got no angular drag

[timid dove]

There is indeed a setting in physics settings for max angular velocity

[ebon scaffold]

OOOOH

Thanks

[tropic trench]

bump because it feels like questions dont get read if they arent at the bottom of the channel

[mortal galleon]

So I have an airship that I am using physics to move (so that I can have a little more of a floaty feeling). What is the best practice for handling the fact that I can't have a mesh collider w/ a rigidbody and Kinematics ?
Should I do it using a second physics scene .. do all the forces over there then translate position movements to the first scene? Or should I go with a compound mesh?

[arctic marsh]

you could just add a linerenderer and update its postion or make a debug build and call debug.drawray or drawline

[mental tusk]

hey, not sure if you found solution at this moment, but if you're looking for simple yet effective solution you can use joints with locked rotation or link both wheels with 2 or more joints like train wheels are.

Hi, quick question. I would require few physical scenes both 2d and 3d at the same time to function independently. From what i've seen havok does fantastically with lots of objects at 3d scenes, but build-in 2d unity physics handles 2d better.
Can i use both Havok and Unity 2D physics at the same time without creating weird workarounds?

[arctic marsh]

From the docs it sounds like you have to use either or

[mental tusk]

That would agree with my findings. Is there at least any good documentation for havok, I'm having problems finding one based on unity integration

[arctic marsh]

do you search for anything special or just the general doc page?

[mental tusk]

Something containing explanation of compoments, script references etc. Like Unity docs about build in physics

[arctic marsh]

it somehow is based on the unity physics system, so maybe you find some answers there that go beyond the basic setup of havok?

[mental tusk]

I suppose as of now it's unfortunately limited to user made tutorials and resources with text based, and unity ECS/Havok sample project.
Thanks for help.

[tropic trench]

alright thank tou i will try that

[tropic trench]

ok yeah

can confirm, rays are messed up on linux

i think its an input issue

but im not sure how

@timid dove do you know about input settings i could change since you were helping with this before

at least i think you were the one who suggested setting the mouse inputs to the input system rather than the manager

ok based on some further debugging

it looks like the mouse is not being locked

moving to #🖱️┃input-system ig?

[pine tinsel]

I'm attempting to make an active ragdoll, and I believe I have all the joints in the right place, however whenever I press play, the ragdoll, with a box collider, still falls through the floor. Any ideas why?

[timid dove]

None of your ragdoll limbs have colliders

[pine tinsel]

Figured that might be an issue; I’ll just take a simple model and do that. Doing this seems like it’d be a headache for my first game

[lofty vale]

Basic question about colliders. I have a relatively simple object I made in blender with armature animations, and I added a mesh collider to the object hoping I could stand on it. I can, but the collider doesn't move with the animation. How do I make the collider move with the object?

[timid dove]

You don't.

You make up a collider from primitive colliders on the various bones of the armature.

It's too cost prohibitive to fully animate a Mesh Collider

[lofty vale]

Oh, well that's interesting

[pine tinsel]

Hey, so say I have five different humanoid models, but they’re all the same shape, is there a way to transfer the configurable joints from one model to another? Or do I have to sit there and do the exactly same joints for each model?

[storm shore]

Can you duplicate your object hierarchy and then just change the mesh or meshes?

I have a question regarding how to influence the direction of a rigidbody's velocity based on its orientation. I'm trying to make a physics based skateboard and I'm trying to avoid wheel colliders. Right now I have a rigidbody for the board and a rigidbody for the trucks. They are connected through a hinge joint so it angles itself like a real skateboard. I am using sphere colliders for the wheels with a low friction physics material. The problem is this makes the board slide around any direction whereas I'd like it to orient its velocity based on where the trucks are pointing.

A cube is sitting on the board making it tilt so the trucks are turned slightly. The white lines are the forward vectors of the board and trucks respectively.

I guess what I'm looking for is a way to have directional friction? Like little to no friction for the direction the trucks are pointing but high friction for sideways movement.

[tawdry rampart]

So if I understand correctly, the wheels are sliding instead of rolling atm?

[storm shore]

Right, they're just sphere colliders with a physics material with low friction values.

[tawdry rampart]

Sphere colliders are fine here, but you need them to roll, not slide to have direction. I also don't think you need low friction here.

Maybe something like this, see how it rolls based on the direction it's facing not straight down the slope

Even though it's using sphere colliders for wheels

[storm shore]

I see. How is the rotation locked to a particular axis? I don't see how that's being done on the articulation body

[tawdry rampart]

By the Revolute joints of the Articulations (on the "wheel" GameObjects)

Tho you can do the same with Rigidbodies + Hinge Joints, it's just faster to author Articulations for me personally 😄

You can click the "Edit Joints" button in the Inspector to see the axis that the body is going to rotate around

[storm shore]

I think I understand. I'll give artuclations a shot.

[nocturne goblet]

How can I make it such that a navmeshAgent does not attempt to avoid other navMeshAgents (meaning collision avoidance is none) but still have them collide with the other agents such that they cant move thru eachother?

Thes objects have a rigidbody on them, but must be set to kinematic, so I dont believe I can just put a capsule collider on them to collide with

I just dont understand why the whole obsactle avoidance section of the agent is throw out when set to none. The priority value is extremly useful, but I cant have the agents avoid eachother because when two agents have eachother as a destination, they start to turn a little and it looks very strange. I also prefer agents to get stuck behind other agnets as a mechanic

All I want is the ability to turn off obstacle avoidance while maintaining 'matter' and priority

[midnight elk]

Ive got an object with a cloth simulation (think a sheet of paper) when i shoot it holes are instantiated onto the surface. The issue is when i then move the cloth the holes remain where they were instantiated. How can i like attatch them to the cloth?

[unique cave]

This is something that came to my mind: when instantiating the holes, use Cloth.vertices to get the cloth vertices -> find 3 of the closest vertices from the hole -> use barycentric coordinates to find the masses for the 3 points -> use those 3 points and the masses to calculate the position whenever you want. This wont work on every case but depending on the usecase, could work very nicely

[midnight elk]

at the moment im trying to use a hinge joint for it instead, i want the piece of paper to swing when the object it is attatched to moves, and i want the holes to stay on it.

At first this seems to be working. If i manually rotate it it swings and the holes remain attatched as seen in the image i attatched. However when moving the thing its attatched to nothing changes, its like the paper has no gravity and isnt effected by drag

[timid dove]

Unity doesn't have a realistic air resistance model

You're not going to get the effect naturally

You'll have to either add your own drag forces or do some faking

[midnight elk]

what do you reckon would be the easiest way of faking it?

[ruby perch]

hey, i am trying to implement client side prediction with rigidbodies in my game, I need to spawn each player on their own physics scene so i can simulate their movement s individually with Physics.Simulate() how would i go about doing that, and is it necessary

[steady shadow]

my car keeps spinning out when I go to fast

https://pastebin.com/4VVZeRx4

[steady shadow]

@frosty dust I kind of need you again if that’s okay

I’ve tried the drift power at multiple things and i can’t get this to work

[astral coyote]

Hello, can someone help me out with the simulation of a black hole?
i have written a shader code to represent the black hole effect.

float4 frag(vertexOutput input) : COLOR
           {
               //Set up particle
               float3 initpos = CartesianToSpherical(_WorldSpaceCameraPos);
               float3 rayDirection = normalize(input.worldPos - _WorldSpaceCameraPos); 
               float3 initvel = toSphericalVel(_WorldSpaceCameraPos, rayDirection);    

               LightParticle particle;

               particle.position = float4(0, initpos.x, initpos.y, initpos.z);
               particle.velocity = float4(1, initvel.x, initvel.y, initvel.z); 
               //particle integration  
               float s_R = _SchwarzschildRadius; //2 * G * M / (c * c);
               int numIterations = 0; 
               float stepSize = _StepSize; 
               int maxIterations = _MaxIterations; 
               while (numIterations < maxIterations)  
               { 
                   // Runge-Kutta 4th order
                   float4 v1 = computeDerivatives(particle.position, particle.velocity,s_R);
                   float4 v2 = computeDerivatives(particle.position + 0.5 * stepSize * v1, particle.velocity, s_R);
                   float4 v3 = computeDerivatives(particle.position + 0.5 * stepSize * v2, particle.velocity, s_R);
                   float4 v4 = computeDerivatives(particle.position + stepSize * v3, particle.velocity, s_R);
                   particle.position = particle.position + stepSize * (v1 / 6 + v2 / 3 + v3 / 3 + v4 / 6);
                   if (particle.position.y < s_R*1.1)
                       return float4 (0, 0, 0, 1);
                   ++numIterations;
               }
               float3 endpos = (particle.position.yzw);
               float3 endvel = (particle.velocity.yzw);
               float3 end_vel_cart = toCartesianVel(endpos, endvel);
              return texCUBE(_Cube, end_vel_cart); 
           }

the problem that i have is, when i zoom in i can see the distortion of the light but i never the the event horizon like in the last picture, do someone know what i did wrong?

[foggy current]

Hey ! Anyone here capable to help me make my car (tractor) stay in once piece and not "melt" into the ground please ?

[swift whale]

ok so I have a parent object with a mesh collider, rigid body, and a hinge joint (the black cylinder) and a child object with colliders (the orange handles). the child object moves with the parent when editing but in game when the parent object is moved with physics the child stays still, anyone know why it does this or to how to fix?

nvm they were set to static, I am an idiot

[tropic trench]

My item keeps clipping through the terrain, should I set the item to use a more expensive collision detection or what

I am also using a network rigidbody if that matters!

[toxic coral]

How can I disable physical "pushing" when having two colliders? I created a new Capsule Collider to act as a "Scanner" for detecting objects. However when I run towards an NPC the NPC gets pushed away from that "Scanner Collider". How can I still listen on collision events but not physically affect gameobjects with that "Scanner Collider" I made?

[formal chasm]

Good Morning! I was wondering if anyone has any experience with Configurable Joints? I'm trying to connect two objects with a gap between them. I've set up a simple test. The problem that I'm having is the objects zoom to one another as if the connectedAnchor and Anchor should be at the same point, has anyone experienced this before? If I run this code, they'll immediately snap to one another

[carmine basin]

I want to create something that inherits from PhysicMaterials with extra properties; how would I do this?

Rather, i've tried making my script inherit from PhysicMaterial, and adding in the "CreateAssetMenu" stuff

but to no avail

[foggy current]

Hey there ! Could someone help me for something ? I want to make a race game prototype in 3D but I'm a beginner and I cannot understand how to make the Wheel Collider work properly... can anyone help me please ?

[random cypress]

I'm very new to making a game in Unity as I'm going to make a prototype for 2 Touhou Project fangames which is 1st that is a open-world sandbox game and 2nd a racing/driving game with realistic physics and graphics.

Of course I'm basically making a prototype in Unity which is basically where it's one character (Reimu Hakurei or any other Touhou character) and there is only 1 car and it's set in a map where it's taken place in a map where there's stuff like ramps for stunts and even crash testing stuff too.

Now the reason why I'm here is that I'm trying to make my very first game as I said and I want to see how I make Reimu or the other Touhous get in the car and how to make it visible so I can see Reimu in the car.

The main thing here is that the physics for the car which means like driving around as well as having crash physics (soft body or mesh deform) and of course having the car parts break off like bumpers wheels etc.

Since this is like a small prototype, I could expect people to make mods for it if they like such as adding new vehicles, new characters and tracks and even improving up the graphics/physics and stuff.

Of course the Touhou driving game prototype demo is gonna be in Unity but if someone gets inspired by it or whatever means they could put it into Unreal engine if they like, Same for the Touhou open-world sandbox game as well.

Remember, This is like a small prototype/demo that I'm making and anyone or whoever could improve it like make mods or whatever they want to do with it like improving physics/graphics and more as it starts off small and will get bigger and better in the future.

The idea of a Touhou Project open-world sandbox game inspired by Grand Theft Auto and even a driving/racing game where Touhous drive vehicles like cars/boats/bikes/planes and helicopters and many more vehicle types with realistic physics and graphics would some like an amazing Touhou fangame for Touhou fans like me.

[polar wolf]

Anyone understand why my player's Rigidbody.velocity.magnitude is so messed up when standing on a simple box collider?
It's the player vel variable under the Player Anim Controller script
https://imgur.com/i8qAOp4

I need to be able to stop the player from changing their state if they're moving but I can't really do that if whatever is going on here is happening

[remote pewter]

post code

[polar wolf]

https://hastebin.com/share/dujaduqopa.csharp

The anim controller is just doing Rigidbody.velocity.magnitude so I sent my player controller

it's a little bit of a mess atm because I'm in the middle of transitioning into having player states so sorry to your eyeballs

The rotation on the prefab/colliders is completely flat too so I'm just at a loss

[remote pewter]

what about the script you're looking at

the one with PlayerVel

[polar wolf]

It shouldn't be doin anything but one moment

https://hastebin.com/share/rayadiloxi.csharp

[remote pewter]

are those values matching that of the rigidbody if you look at its inspector values/velocity

[polar wolf]

Yup

Let me see if it's an issue with my movement script

I'ma just disable it while on the prefab

huh yeah it's something with the movement controller

[remote pewter]

yeah my guess it's that Lerp

[polar wolf]

Ah that'd track

Let me give it a try

[remote pewter]

also check IsGrounded when you're on that platform too

[polar wolf]

Yeah is grounded works no problem

[remote pewter]

then yeah it seems to me the lerp isn't lerping correct

[polar wolf]

So bad news is that it isn't the lerp

[remote pewter]

you tested ?

[polar wolf]

yup

I'm now even more confused

[remote pewter]

how did you verify it's not

[polar wolf]

I commented out the lerping and replaced it https://hastebin.com/share/suzivoroqi.csharp

[remote pewter]

what's PMoveUpdate

how are you calling it

[polar wolf]

It's being called by my player manager on fixed updated https://hastebin.com/share/oboqukepan.csharp

It's just a glorified FixedUpdate so I can reuse my input manager

[remote pewter]

does it only happens when you go on that collider ?

also cs // 0 = Moving, 1 = Fishing public int playerStatus = 0; should be an enum :p

[polar wolf]

I'll be 100% I have zero clue what an enum is but I'll do it after we figure out the mystery of this

I'm not a good programmer lmao

[remote pewter]

think of it like ints that you can use label instead

[polar wolf]

Interesting

I wish I knew that

and yeah it seems to only be with the prefab bridge

Which confuses me

[remote pewter]

public enum States { Moving, Fishing}

[polar wolf]

100% gonna swap to that then

[remote pewter]

are you looking for any special Tags / Layers ? I'm not seeing much here

[polar wolf]

Nope it's on the default layer so I'm pretty confused what could be doing it.
This is what the colliders are like

Yeah I just disabled all of them but what you're standing on just in case and it's still there... I'm so confused

[remote pewter]

is it only the bridge? have you tried other colliders ?

or new 3d cube object

plane

[polar wolf]

A brand new cube works perfectly fine

[remote pewter]

hmm something is up with the bridge then ? weird

[polar wolf]

Maybe it's because it has an lod group? Even though it doesn't have a mesh collider one

sec

Nope...

Like maybe I'm missing something?
But it's just a mesh with some box colliders over it

Oh never mind I guess somehow the one time I tested the box collider it was 0. But it's doing it on cubes no

now*

Wait... It's doing it on scaled box colliders?

[remote pewter]

wdym scaled box colliders

[polar wolf]

One sec

[remote pewter]

also you could also just set the velocity to 0 when you stop using Inputs no

[polar wolf]

So if the box colliders size is changed in anyway it happens... https://imgur.com/wbPZoXk

[remote pewter]

maybe inputVec or one of those aren't letting it go back down to 0

[polar wolf]

Hmmm

That isn't it hrmmmm

I'm running out of ideas on what could be it

[remote pewter]

maybe the collision is adding extra forces somehow

[polar wolf]

That could be my only guess

but like why

[remote pewter]

I mean physics works like that

nothing comes to a complete stop

usual residual forces remain in some way shape or form

I would say to try first my earlier take

[polar wolf]

I guess.. I think that's scientific notion for really dang small so I can just have a temp work around where if it's < than like 0.01 or something

[remote pewter]

just explicitly set the velocity to 0 when you let go of keys and certain conditions are met

I think the reason why rigidbody based controllers are iffy is they are hard to get precise control over

[polar wolf]

Yeah that work around works. I can't say I'm the biggest fan of it but it does work

Well thanks for the help

[remote pewter]

srry wish I could help out more

[polar wolf]

And thanks for letting me know about enums, the name always spooked me

It's probably a unity thing so a bit out of your control

[remote pewter]

limited knowledge on rigdbody based controllers & only know basic physics 😇

[polar wolf]

At least I was able to find a solution so that's all that really matters

[solid spoke]

Why is the collider for my capsule expanding when i'm trying to use it as a Configurable Joint?

I think it might have something to do with the configuration of the Anchor(s)

[pulsar canopy]

My child (dynamite) doesn't move with parent object (left hand) when being thrown

https://streamable.com/if4jr6

you can see it floats right before it gets thrown

why?

[solid spoke]

It seems the solution is I didn't have the parents scale uniform, as well as its child objects. If anyone is wondering!

[onyx lion]

Hi guys, my character controller is able to clip in corners, any tip?

[tropic trench]

How are hitboxes looking? Can you send a video?

@onyx lion whoops meant to ping

[carmine basin]

I'm trying to get the physic material of a collider and compare it to one in a scriptable object

and its always returning a null ref

my code is as follows;

  hit.Collider.attachedRigidbody.AddExplosionForce((bulletDamage / (hit.Distance / maxRange)) * bulletForce, hit.Point, 0.1f, 0.2f);
  var impactEffect = ImpactScriptableObject.impacts.Find(x => x.physicMaterial== hit.Collider.sharedMaterial);

and impacts is a static list of custom class Impacts

[timid dove]

NREs are always the same

• Identify which reference is null and why

• Fix it

You have a lot of dereferencing happening on that line - split the line up and/or log all the possibilities

[carmine basin]

I fixed it, I am now checking the hit physics material, and using the name

[timid dove]

ImpactScriptableObject.impacts
hit.Collider
hit.Collider.attachedRigidbody
Any of these could be null

[true zenith]

Hi! I am making a game where you often have to connect the cables, and I am wondering about a way to make a wire simulation. After watching some tutorials, I made a objects connected with joints, and simple mesh generator, but it behaves buggy and freaks out often. Can you please give me some advice on the configuration of Configurable Joint (that's what I used) or maybe there is a different better approach to simulating cables in Unity?

[timid dove]

depends on what kind of simulation you want/need

does it need to be a fully physical simulation?

Just a grpahical one?

If you just want it to look nice you can use Verlet Integration. If you want actual physics simulation you can use either joint chains or if you want to get fancy there's https://assetstore.unity.com/packages/tools/physics/obi-rope-55579

[true zenith]

Well it needs to behave like a rope for some time, for example I connect it to one point, then it follows me (if possible it gets more joints) and after I connect the other end it should fall to a floor like a wire, and then maybe I can stop simulating it and just use mesh. Graphical mesh satisfies me enough, even with not so regular joints it looks ok for my purposes

[true zenith]

Yeah, looks fancy, but costs more than my monthly earnings xd

[true zenith]

Talking about physics, it does not need to pull, it just should hang between two static points

[carmine basin]

You could most likely code it, in that case

maybe use a line renderer

and then you can code the sagging/hanging

[onyx lion]

okay give me a sec

well, its just a capsule collider

[tropic trench]

ok can you send a video of the problem?

[true zenith]

Well, seems like I've found a reasonable working solution, I just used hinge joints, and also used more joints (here are 200, but I will try to minimise the number)

[onyx lion]

yup

[tropic trench]

is there a hitbox on this

the room

[onyx lion]

Yes

Its not only the room, is with every corner :(

[grand raptor]

hey y'all, I'm really new to the programming and rigging side of things, and could really use some help with a problem I've encountered during a project. I hope this is the right channel for this lol.
Basically, I have this little goblin dude whose robe is supposed to have some cardboard cutouts pinned to it. The hat and sleeves are controlled with dynamic bones, but the bottom uses cloth physics. Ideally, I want to be able to "pin" the cardboard pieces in place on the robe as it moves around, but I can't figure out how to do that. I don't think vertex groups transfer from blender to unity, and I'm not sure how else to attach them in a way where they maintain their rigidity and proper position.
I'm having a few other problems with this right now, but this is definitely the most pressing haha

[gentle marten]

Hello guys , i have 3D model of an area and i want to make flood simulation on it with C# and m new to this ..so any help ?

[timid dove]

Sounds like some university research level stuff. Unity doesn't have any kind of built in fluid simulation.

You'll have to make it yourself from scratch, find a library that does it, or buy an asset that does fluid sim.

[gentle marten]

i can work that with C#?

i mean coding

[timid dove]

Sure... you could do it in C#, you could do it with a native plugin, you could do it however you want.

[gentle marten]

can u help me with tutorials or videos

i am just new to this

and i dont know how

[timid dove]

You are at the start of a very long journey

a fluid simulation is a pretty advanced topic

if you are just barely a beginner at programming, it could take you years to get to the level where you could do a realtime fluid simulation.

If you'd rather skip that, there's always assets https://assetstore.unity.com/packages/tools/physics/obi-fluid-63067

[gentle marten]

look i dont need to have advanced skills at doing physics simulations ..i have a 3D model and i want to make flood on it ..it doesnt have to be like tough work ...i just need some guidness ..if someone like work on somethin like this ..

[inner thistle]

Fluid simulation is one of the more difficult things you could pick. It's not going to be simple no matter how hard you wish it would be.

[warm plank]

Hi guys, I'm trying to create an artificial gravity scenario like in space engineers, and I'm having trouble with keeping the velocity of the player consistent with the spaceship when the ship collides. I have the rotation and velocity of the player locked with the orientation of the spaceship, but when the ship collides the player gets the ships 'attempted' velocity applied rather than its actual velocity, so for example when a ship collides head on with a wall, the player will slide forward within the ship as if there is no collision. How can I fix this?

https://hastebin.com/share/fupicutino.csharp

[gentle marten]

No solution for even making simple thing ??

[timid dove]

Fluid simulation is simply not simple

unless you want to dumb it down to something like Minecraft water

[craggy mulch]

I'm having a weird issue with physics2d.overlap. I'm 99% sure my coordinates and layermasks are correct. This is the code:

        bool IsBlockedAtPosition(Vector2 position){
            Vector2 half = new Vector2(-.45f, .45f); // TODO: Move this somewhere globalish
            var transformedPosition1 = _machineRoot.TransformPoint(position - half);
            var transformedPosition2 = _machineRoot.TransformPoint(position + half);

            ContactFilter2D filter2D = new ContactFilter2D();
            filter2D.layerMask = _blockedLayerMask;
            List<Collider2D> hit = new();
            var collidersAtPosition = Physics2D.OverlapArea(
                transformedPosition1, 
                transformedPosition2,
                filter2D,
                hit
            );

            var c2 = Physics2D.OverlapBox(
                _machineRoot.TransformPoint(position),
                _machineRoot.transform.localScale * .9f,
                0,
                _blockedLayerMask
            );

            Debug.Log("Is Blocked Check - pos: " + position + ", p1: " + transformedPosition1 + ", p2: " + transformedPosition2);
            Debug.Log(hit.Count);
            Debug.Log(collidersAtPosition);
            Debug.Log(c2);

            if(collidersAtPosition > 0){
                return true;
            }

            return false;
        }

What's extra weird, is if I move the target collider from being a child of _machineRoot, to a child of the scene root, without changing the position/scale/rotation at all, the overlap suddenly works

One of those works, the other does not!!!

There are no rigidbodies or colliders on any of the parents, so I don't think it's a composite collider thing

[gentle marten]

its okay ..how can i do somethin even similar to that

[timid dove]

similar to what

minecraft?

[timid dove]

I'm having a weird issue with physics2d.overlap.
Are you going to share what the issue is?

also I have no idea what I'm looking at in those screenshots

no context for your game

[craggy mulch]

ah, fair, the overlap doesn't find anything

[timid dove]

and what are you expecting it to find?

And which overlap do you mean?

you're doing at least two of them

[craggy mulch]

basically I have a polygon collider at a given location, and I'm trying to OverlapArea/Box, and it returns nothing, even though I'm sure the position/scale and layermasks are correct

[timid dove]

how did the collider etc get there?

did it move this frame?

Also this contact filter is almost definitely wrong:

            ContactFilter2D filter2D = new ContactFilter2D();
            filter2D.layerMask = _blockedLayerMask;```

[craggy mulch]

it didn't move that frame, it's attached to an object that is instantiated on scene load

well

[timid dove]

You should use filter2D.SetLayerMask(_blockedLayerMask);

[craggy mulch]

when I put the object at the root of the scene (while the game is playing) it works

[timid dove]

otherwise it will ignore the mask

[craggy mulch]

ok, I'll try that, sec

[timid dove]

unless you also do filter2D.useLayerMask = true;

but - if you use SetLayerMask it will also set that

[timid dove]

ok so I'd say your object is probably not where you think it is

or doesn't have the collider(s) you think it has

or it moved that frame and physics colliders don't update usually until the physics simulation phase

[craggy mulch]

the 2 screenshots show the object in the same place, with the same collider, in one screenshot it works, the other it does not

so I'm very confident that the object and colliders are correct

[timid dove]

I don't see anything in the screenshot demonstrating a collider

nor do I know which object we're talking about

nor can I verify that any of these positiions etc. are correct

from the information you've shared at least

[craggy mulch]

in both screenshots, the object on the right with the transform gizmos. So, identical positions. You're right I have the collider gizmo disabled, but I can promise you that in the 2 shots, the colliders are identical. All I've done is drag the object from one objects root to the scene root (which you can see in the hierarchy view on the left of both screenshots)

[timid dove]

and how do we know that _machineRoot and position and _blockedLayerMask are the same

[craggy mulch]

here's the collider when it does work (at root of scene):

here's the collider when it doesn't work (object is child of machineroot):

the same exact function with the same exact args are called each time (so position is identical, I'm even logging this to be sure)

here's the layermask of that object in the screenshots that I want to overlap:

[timid dove]

That's a layer. How is the mask defined?

[craggy mulch]

here's what is set in the script

[timid dove]

where is this happening?

[craggy mulch]

I'm not sure what you mean

[timid dove]

where are you calling IsBlockedAtPosition

[craggy mulch]

well, it's a bit hard to isolate that in any meaningful way to share with you, but I'm not sure that it should matter too much, since it's called from the same place and with the same args in both contexts (where it works and where it doesn't), but

        private void DoFormation(ConveyorAgent agent, Barcode barcodeOutValue)
        {
            Vector2 pos = agent.transform.localPosition;

            agent.PathPoints.Clear();
            agent.PathPoints.Add(agent.transform.localPosition);

            for(var i = 0; i<barcodeOutValue.VectorsTruncated.Count; i++){
                Vector2 vector = barcodeOutValue.VectorsTruncated[i];
                var newPos = pos + vector;

                if(IsBlockedAtPosition(newPos)){
                    Debug.Log("Blocked at position: " + newPos);
                    continue;
                }
                
                pos = newPos;
                agent.PathPoints.Add(pos);
            }
            agent.BuildFormStrip();
        }

[timid dove]

I guess what I was trying to ultimately get at is some context about when this thing is called compared to when the object is created / positioned

[timid dove]

<@&502884371011731486> spam

[rapid canopy]

Hello guys,

I am currently trying to handle this kid of issue with physics, where an object (blue) is moving on the ground (green left) and get stopped by an other ground (green right) object on the same level.
When using a mesh collider (i.e. creating a plane with a Physics Shape whose Shape Type is set to mesh) my (blue) object still stop around the intersection 2 triangles.
Is it supposed to be the normal behavior ? I would have expected the decollision to happen on the whole mesh level, not on a per triangle level.

[craggy mulch]

Yeah, that makes sense. Not sure how to be more illustrative about that, other than to say that everything is stationary, and was instantiated on scene load.

The only difference between the one that works and the one that doesn't is that in the one that works, the collider I'm trying to overlap is in the scene root, rather than being a child of machineRoot

[warm plank]

Is anyone able to take a look at this?

[hollow wind]

Hi! I've been dealing with a very annoying issue for the past year. I'm making a VR physics game, and when the FPS is a rock solid 72 or 90 (depending on the screen refresh rate), the physics are fluid and without stuttering. But the moment the FPS drops to 71/89 FPS, objects suddenly become stuttery (even with interpolation ON), and collisions have completely results and objects fly away at 3x the speed. I've set the Timestep to be 1/refresh rate. And the worst part is that I've implemented Entities Physics to my project with the hopes of this not happening anymore but unfortunately it has the same problem! Any help would be greatly appreciated.

Also in Unity DOTS Physics Package for some reason changing the collision solver count to some other value than 4 does absolutely nothing. And when Debug.Logging the value it display a 0, which makes no sense.

(Note it displays a 0 inside the headset which runs on Android, in the Editor it says 4).

[hollow wind]

Isn't this what should actually happen?

In real life when a ship collides with something people and objects fall down

Because the speed they have keeps affecting them

[uneven pine]

well is there friction? if not then sliding is whats supposed to happen

[vital jolt]

working on my first "game" why does my cube go flying : (

if I enable kinematic it just passes through the walls : (

[arctic marsh]

How do you move your kinematic rigidbody?

@vital jolt

[hollow wind]

Always move rigidbodies with rigidbodyComponent.MovePosition(Vector3 targetPosition)

This way it will collide with walls because it will move the object taking physics into account

If you do tranform.Translate() instead it will ignore physics and thus ignore walls

[deft grail]

kinematic rigidbodies completely ignore collisions, because when you set a rigidbody to kinematic, you're telling the physics engine "I'm handling all of the collisions myself"

so kinematic rigidbodies will call the physics callback functions like OnTriggerEnter and OnCollisionEnter, but won't do anything unless you explicitly tell it to

hence, passing through walls

[vital jolt]

@arctic marsh you mean how is my script set up? I'm using vector 2 transform.translate"horizontal"//"vertical"

[deft grail]

how does energy transfer work for box2d dynamic rigidbodies? if two bodies collide do dynamic collisions just take the mass and angle into account for calculating trajectory? how much does the overlap impulse affect the determinism of the collision?

essentially I'm trying to predict how two rigidbodies will collide so I can know quickly going into the future if I need a rigidbody to be kinematic, or I can just leave it dynamic because it'll do what I want

[bleak umbra]

i have a mesh collider and a terrain collider that are flush with each other, still when i roll a ball over the edge between them the physics engine makes the ball jump, is there any way fix this with physics settings/collider shape? i'd like to avoid writing a custom controller for the ball as that would complicate things a lot since i'd like to actually keep those little jumps in places where there is a tiny edge. All colliders have physics materials with zero friction and combine to minimum.

an ortho view of the situation showing the mesh collider

[timid dove]

That's a pretty esoteric question, but Box2D is open source so you could go digging for it

[bleak umbra]

was looking for an easier fix 😄

[deft grail]

he wasn't even replying to you? lol

[bleak umbra]

phew, hope restored

[arctic marsh]

If you translate the transform directly, it avoids collision detection, you have to move the rigidbody or set the velocity

[arctic marsh]

Does this happen to other objects too, lets say move a simple cube with a box collider over it?

[warm plank]

No, I don't want the player to have inertia, I want all their physics to be calculated relative to the ship

[warm plank]

It's supposed to stay locked relative to the ship. My goal was to have all the players physics calculations relative to the ship, so when the ship isn't moving then neither is the player

at the moment I have their up direction locked to the ships up direction, and their velocity is calculated relative to that, but there's obviously some things left over I've missed

[uneven pine]

How does that make sense

[warm plank]

Which part are you confused about?

[uneven pine]

the fact that having the player locked, is not very physics based

[warm plank]

well it's just the up direction so that I can calculate gravity relative to the ship rather than world space

I want all their physics to be relative to the ship, so if the ship isn't moving they shouldn't be moving within it, which is the bug I'm trying to fix

[uneven pine]

I still don't understand are you trying to have physically accurate model, or some physics that don't make sense but feel good

[warm plank]

the latter

it's artificial gravity like my post said

[uneven pine]

since when is a computer simulation not artificial lol

[warm plank]

like artificial gravity in sci-fi

[bleak umbra]

yes

[arctic marsh]

I guess your mesh collider is not clean enough then at some point. Not sure about the values on the mesh collider, but is there something like contact offset

[rapid canopy]

I have the exact same need. If you find a solution, let me know, I will too

[bleak umbra]

the mesh collider vertices are exactly at the position that a raycast to the terrain collider returns

thats what a cube does (the blue gizmos are the contact points), green gizmos are the average of all the contact points

[arctic marsh]

There has to be something. if you remove your meshcollider and use a simple plane collision, it should not happen, right?

[bleak umbra]

same result with a plane

[arctic marsh]

Well, then you have another issue here. How are you moving the object?

[bleak umbra]

i'm not moving it, the rigidbody moves it

based on what this z-fighting tells me, the terrain and plane meshes are perfectly aligned

[arctic marsh]

the rigidbody moves it? but how, this looks flat, so where does teh velocity come from?

[arctic marsh]

Ahhh, got it, okay

So you have a plane and on that plane a mesh collider and between those two, it gets this little bump

[arctic marsh]

this might help you , there is a script down below. Seems like a global physics calculation issue and the OP made some script to avoid it. https://forum.unity.com/threads/rolling-ball-bouncing-issues-preventing-upgrade-past-2018-2.1054418/

But for the sake of levelcreation, you might just stitch together the mesh at some point and create one meshcollider for the level or at least continuous parts

[bleak umbra]

it even messes up "rolling" over the terrain with no mesh collider in the vicinity (happens rarely)

[arctic marsh]

hm, what is your rigidbody set to with interpolation?

[bleak umbra]

interpolation settings dont make a difference, tried all combinations

anyway, i'm going with a custom sim, rigidbody sim seems to be way too much hassle

[arctic marsh]

All sims run the same afaik

under the hood they check against faces and vertices

[bleak umbra]

makes sense

thanks for that link, interesting conversation that

[arctic marsh]

So the grid pattern I see on the last screenshot is a terrain component in unity, right?

[bleak umbra]

the ramp is a mesh, the ground is a unity terrain (height cleared to world 0)

[arctic marsh]

Something is weird here... I just tested the same setup on my side, nothing jumping or anything

[bleak umbra]

might be a GC spike that messes up the sim

[arctic marsh]

Oh well, that can very likely be, maybe going out of game view and back to it, alt tabbing, or what not.

[warm plank]

Is there any way of making a rigidbody only apply forces to certain other rigidbodies?

[timid dove]

layer based collisions

[warm plank]

Do you have a tutorial or docs? I couldn't find anything on this

[timid dove]

first google result https://docs.unity3d.com/Manual/LayerBasedCollision.html

[warm plank]

wont that stop them actually colliding? All I want is to stop the forces

[timid dove]

what's the difference?

forces are what makes them collide

[warm plank]

I mean more stop them from pushing each other about

[timid dove]

again what's the difference

can you actually explain what the behaviour you want is?

[warm plank]

they stop each other from moving but don't actually move each other when they collide

[timid dove]

That's kind of a weird and imprecise behavior

stop moving?

So maybe just set velocity to 0 in OnCollisionEnter?

[warm plank]

Right I'll try that

I might just make the mass for one a lot larger I guess that'd be the most physically accurate

[safe flare]

are physics materials broken in 2021.3.11? This still slides like ice.

[timid dove]

is there code involved?

[safe flare]

yes. I use apply force onto the object to move it. That's it though.

[timid dove]

is the ball rolling?

[safe flare]

yes

[timid dove]

well

that's why

high friction on a rolling ball just means... it grips well to roll

it's not actually SLIDING

sliding is where friction matters

[safe flare]

I see

[timid dove]

if you want rolling resistance

try angular drag

or make your own custom with AddTorque

[safe flare]

i see

cus angular drag would always affect it, even while in air, right?

i guess that's fine

[timid dove]

yes it would

[safe flare]

thank you

very misleading picture for the physics material ngl

[timid dove]

hah

didn't think of that

[halcyon walrus]

Hello,
I have an enemy with 3 colliders on it. I don't want any of these colliders to collide with eachother on the instance of the object they exist on.
However, I do want these colliders to be able to collide with other instances of the same object.

Basically, I want the enemies to collide with eachother, but not with themselves.

Can I do this with layers, or do I need to do something else? It seems like using layers they either collide with themselves and eachother, or none of them collide

[timid dove]

As long as the enemy parent object has a RIgidbody, none of its child colliders will interact with each other

(unless the children have their own Rigidbodies)

[halcyon walrus]

Oh I see, let me check

[timid dove]

if the children need to have their own Rigidbodies you can use https://docs.unity3d.com/ScriptReference/Physics.IgnoreCollision.html to have each pair of colliders in the object ignore eeach other

[timber pelican]

in general, is it ok to have a child rigidbody under a parent rigidbody?

[arctic marsh]

not a good idea in general, if you want both to be affected by physics. If its just for collision and kinematic, it might work, but usually child object colliders are taken into account of the root rigidbody I think

[timid dove]

It's ok as long as you thoroughly understand all of the consequences and caveats of doing it.

It's "ok" in the sense that nobody is going to stop you and your game isn't going to crash.

[tawdry rampart]

As others said, it's ok but the main thing to understand here is that Rigidbodies do not really follow the concept of a hierarchy. Their movement is not going to be constrained based on their position in your Scene Hierarchy. If you want the child Rigidbody to move together with the parent, you should use Joints (e.g. a Fixed Joint to simulate a hierarchical parenting).

[quaint charm]

I have a cloth swinging here and 4 objects which are children of the cloth. How can i make them follow the cloths movement? I thought just making them children of it would make them yknow stick to the cloth but that didnt work

[tacit laurel]

how do you pin one hinge joint from a chain in place ?

when i set up a configurable joint in free mode it'll stay in place but others don't stick to it anymore

in locked mode the translation changes, just the rotation is locked

[tacit laurel]

kinematic rb on pinned joint results in erratic motion for the rest of the chain

[naive panther]

I have a problem where everytime I run my game the cube starts to rotate (a.k.a the player) and its not supposed to, even when I press freeze rotation z it still rotates and either makes the game impossible or far too easy

can anyone help?

[unique cave]

Sounds like you are rotating the cube either via script or animation, objects doesnt rotate without a reason

[onyx lion]

Hi guys, i have a little problem, is there a way to "force" not clipping into corners? Its because i use runtime imported models so they just have mesh colliders and i cant controll that, i dont know if i expressed well

[naive panther]

Its bouncing on the ground. It's supposed to bounce when it hits an object

I accidetnly changed the mesh to a sphere once and then i changed it back and now Im having these problems

[unique cave]

Really hard to guess with this little information given. Even screen recording of that effect would be helpful. Also how you move the object, how the collider is currently positioned etc,

[naive panther]

sadly I can't upload large screen recording files

[unique cave]

Why?

[naive panther]

discord doesn't let me send files bigger than 8mb

would a call work better?

Ah yes of course it randomly fixesd itself

is there a thanks system on this server?

[tropic trench]

try streamable

very simple uploads

and a large limit on files

[quaint charm]

has anyone got any ideas on this?

or even alternate ways of getting the same effect that arent cloth, such as hinge joints or somth

[stuck bay]

hey does anybody know how I can make a ragdoll balence

[silver moss]

Do you have an example of a game that has the kind of ragdoll balancing you want

[stuck bay]

like gang beasts or human fall flat

[silver moss]

Look into ConfigurableJoints.
They can balance your character rotationally and positionally. Its tricky though

Other joints can work too but CJ has all the features exposed

[dark moss]

I just noticed my ground check is a few physics frames late in detecting the player rigidbody stopping colliding with an object, and that onCollisionExit is being called like two or three physics steps late. (Tested with a slow timescale and no rigidbody interpolation to count frames) This is causing some issues for me, as I want to snap to the ground if I hit a small bump or something, and that relies on me knowing exactly when I stop being grounded. Any ideas as for how I could solve this?

[worldly plume]

So, I am trying to add ragdoll physics to my rigged character, and I seem to have added it correctly. (or so I think) but when I go into play mode. My character starts having an what can only be described as an exercism and starts spazzing uncontrollably

I've made sure that all the colliders aren't overlapping. And I saw something about enabling projections, and I tried that, but that didn't work either.

[timid dove]

you won't know it's happened until after it happened, that's the nature of OnCollisionExit

[steel raven]

So whenever i use rigidbody.addforce impulse it behaves differently depending on where I am on the map. This force is for jumping and in some places the jump is higher than other places. This began happening when I updated to 2022.2.11. There are no colliders in the way or anything an it is just a simple addforce function. All of the physics materials on the ground are the same so i dont think that could be the issue.

[timid dove]

Sounds like a bug in your code.

e.g. perhaps the code is framerate dependent or something of that nature

[tawdry rampart]

Parenting is not going to work here, the simulation only updates the Cloth's vertices, not the Transform. You could write a script that updates the "attached" object's positions based on the simulated vertices of the Cloth. If you want to attach other dynamic physics objects, you could make a kinematic Rigidbody that follows a vertex and attach something dynamic to it via Joints

[tawdry rampart]

The collision exits when the distance between the 2 Colliders is greater than the sum of their contactOffsets (see Collider.contactOffset). So you can still be in a Collision while having a positive distance between them.
If you want to know as early as possible that the bodies stopped touching, you could subscribe to the OnCollisionStay and check what is the minimum separation of the Collision's ContactPoints. That would be only one frame late, because the separation values will be from the start of the simulation step (before the objects get depenetrated from each other). Or you could perform an Overlap query in the OnCollisionStay to check if they are still overlapping after the depenetration if you really need to know as soon as possible.

[quaint charm]

i tried the kinematic rigidbody thing and i couldnt get it to work. i want the object to swing when it moves (its like a paper target) while the holes remain attatched to it (like its been shot) what do you suppose is the simplest way of doing this?

[tawdry rampart]

So the holes are just decals?

[quaint charm]

theyre objects with a material

so yea kinda, tried decals that would make the surface they contact transparent, but couldnt find anyone whod done it for hdrp

[tawdry rampart]

Right, so now it sounds like more of a job for a custom shader as opposed to physics. To render some holes around points that were hit

[quaint charm]

would decals stick to a cloth sim?

[tawdry rampart]

I... Don't know 😄 I haven't done anything graphics related in a long while. Looking at the HDRP docs the Decal feature seems pretty fancy and it looks like it can project the decal onto a deformed surface. Tho I imagine you'll still have to calculate the position and rotation for the decal mesh

So I imagine you know where you hit the cloth. You then find the closest vertex, write down it's index. The position of that vertex is the position for your decal. Then you take some nearby vertices to figure out which way should the hole face?

[dark moss]

Thanks, that's exactly what I was looking for!

[agile marsh]

Is there a way how to fix that football rod so it moves and spins only in single direction.https://imgur.com/a/OjdjIrk
tried with constraints, joints... but didn't have any luck. Bit better looked when I changed velocity and angular velocity to zero for y and z, but still isn't it.

[tawdry rampart]

Looks like a job for a Hinge Joint. Just set joint Axis to be along the length of the stick

[agile marsh]

thanks, i am trying something it looks better. I am bit confused as i tried once that joint but it spun weirdly (because i see that i forgot to move anchor point to centre of mass)

now it is only spinning, but cannot be moved

[tawdry rampart]

Ogh, right, the table football sticks can be moved back and forth 😅 . In that case you need a Configurable Joint

[agile marsh]

I'll look into it 🙂

it works, thanks 😃

[steel raven]

The addforce is called once

[steel raven]

Seems like it fixes when i adjust contact offset. Not a perfect solution because i dont want too low offset

[timid dove]

Once per what

[steel raven]

once, a singular time

[timid dove]

you sure about that?

[worldly plume]

Are mesh colliders inherently worse for performance? Is there any benefit from using a lower poly mesh as a mesh collider instead of just using a mesh collider on a high poly mesh?

[timid dove]

1. Worse for performance compared with what?
2. Yes

[unique cave]

On most cases the difference is not very noticeable due to broad phase checks eliminating most of the further calculations. If none of the collision pairs gets to the narrow phase check, theres no difference between collider types

[deep parrot]

does anyone know how to fix collision bouncing on an edge? My rigidbody bounces up when it hits an edge in the mesh. I have tried capsule colliders, contact offset (it worked a bit but not reliable enough), changing the solver iterations nothing works. Anyone know a solution?

[arctic marsh]

Try to avoid colliders laying edge to edge

[deep parrot]

well im using a model i made in blender ill send a screenshot of the edges. Its one model and one mesh collider:

there is pretty much no where to bounce but it is

ive also tried making my player collider a capsule: But it still bounces

[rapid mortar]

I'm making a small 3D game where you more or less play as a Chain-Chomp from mario - controlling the ball on one end, chain connecting the ball to a static point. I'm using cylinders and Character Joints to make the chain, since hinges only work in one axis, but in testing, the chain will often pull apart (not breaking, just stretching) and flying all over the place. What settings can I adjust in the Character Joint component to make sure the individual links never separate from each other like that?
the chain links are set to not collide with each other, and also do not collide with the ball

[marble reef]

Hi guys I just wanted to know I am creating a VR game in Which there will be Physics Interaction too .. so I have created the basic physics of Player using the Video "Valem Tutorials" have created for the Physics Interaction. I just wanted help with I want the grabbing of the object to be more precise like sticking it to the hand, and also wanted to use Distance Grabbing for the Object .. Can anyone help me ? what to do ahead ?

https://www.youtube.com/watch?v=D9qQb3EvU8c&ab_channel=ValemTutorials

[quaint charm]

is it possible to anchor just a section of a rigidbody? in my situation i want to keep the top anchored in 1 location

i would use a hinge joint however these arent effected by drag, unless there is some way to do that

[timid dove]

joints are the way to do it yes. I don't really understand what your comment about drag means

Drag is a property of the Rigidbody, not the joint.

[quaint charm]

lemme try and explain that a bit better

[quaint charm]

the green line here is a target, im trying to make it so that when it moves in the direction of the red arrow it swings. The blue dots on it are objects which i need to stay stuck to it whilst it moves

[timid dove]

seems like a typical chain of Rigidbodies connected by hinge joints

[quaint charm]

can you explain sort of what id have to do for this? I figured it would be something like that but have no idea how to actually make it and ive never used hinge joints before

[timid dove]

Just make a bunch of Rigidbody2Ds in a line

connect each one to the next via HingeJoint2D

[spring sable]

can I parent a rigidbody to an object without a rigidbody expect parent/child behavior?

would a fixed joint work in this situation?

[spring sable]

right now I have to disable interpolation for some reason when my player is on a moving platform

and I was wondering why I have to do that

if i leave interpolation on it feels like the player is moving through honey

my player is a dynamic rigidbody, moved by adding forces

my platforms are just colliders without rigidbody

[spring sable]

i tried using a kinematic rigidbody platform and a fixed joint, but it dosent work, because I want the player to be able to move around while on the platform.

[spring sable]

why is this?

ik it has to do with lateUpdate being used if a rigidbody is interpolated

but it makes no sense

if I could keep my moving platforms working, but remove the part where I have to disable interpolation I would be golden

[silver moss]

How is your character currently sticking to the platform? Custom code?

[silver moss]

That doesnt really work, you would need a joint or make it follow the platform with a script

Also is it 3D or 2D?

[rapid mortar]

still working on this, going slow
Given that I want the rope/chain to extend and retract dynamically, and manipulate and be manipulated by physics objects, are Cylinders + Character Joints a good way to simulate this?
I've seen some things about Line Renderers, ObiRope, and some stuff about Verlet, but I'm still not entirely sure which is better suited to my needs.

[spring sable]

I’m childing my player to the platform

2D

[rotund lagoon]

I having a problem when I load a scene. On initial load am I instantiating a grid of about 3000 colliders. I then want to immediately run a sphere cast on these. The problem is that for some reason i have to wait a long time after the instantiate before the spherecast will register a hit (100 frames wait = no hit, but 200 frames wait I get hits??)....I'm assuming that Unity physics is for some reason taking to a while to rebuild the collisions in the background.
How can I either:

1. Manually trigger a rebuild immediately after i'm done the instantiating
   or
2. Wait until the rebuild is completed (instead of just arbitrary number of frames)

[rotund lagoon]

Ok, i found that after instantiating the objects, for some reason, I need to set the collider component on each object to enable=false; then immediately enable=true then the colliders will be available immediately...what's up with that?

[timid dove]

Physics.SyncTransforms();``` is what you want

otherwise the physics world won't be updated until the next physics simulation step

[spring sable]

i forgot to note that interpolation is on, the moving platform still works

but the player can barely move and jump

like its moving through honey

I'm not the only one who has come across this (dare i say) bug

https://answers.unity.com/questions/1457983/why-is-this-happening-gif-attached.html

https://answers.unity.com/questions/1295955/character-on-a-moving-platform-slows-down.html

(my exact problem) https://answers.unity.com/questions/1598976/rigidbody-player-moves-slower-on-moving-platform.html

https://answers.unity.com/questions/1161557/character-on-moving-platform-with-interpolation.html

everyone says to just turn interpolation off when on a moving platform, but that's kind of a sucky solution.

[hasty plinth]

Wassup

My physics is actin up

i need some help

When I add force to a rigidbody like this, it not only adds force but also makes it slide across the ground

but in the second screenshot, it doesnt slide

[uneven pine]

well on the second screenshot you have drag which makes the player or whatever stop

[uneven pine]

without drag or friction its always going to slide because there is nothing to reduce the objects velocity

[hasty plinth]

When I add force through script, right before the line where I add force, I set the drag to 0 and then it gradually lerps back to 4 in about 3 seconds

I want it to slide more

but it doesnt

[uneven pine]

whatever you are doing thats a terrible solution

[hasty plinth]

How do I make it better lmao

Im bad at this

[inner thistle]

Why don't you just set the drag to a value that makes it slide the amount you want

[hasty plinth]

How do I get sliding this smooth ;-;

Now, the moments where it seems to clip to the right are where I add force through script

[hasty plinth]

I just set drag to 0 and the problem seems go persist

[hasty plinth]

Plzz suggest me a new one

[inner thistle]

well you have to remove the code that messes it up of course

[hasty plinth]

This

I disabled player movement scripts and it works perfectly fine 😭

But where in those 2000 lines of code is the line that fricks up my force

💀💀

[hasty plinth]

uhh hey

so

[timid dove]

It sounds to me that you just don't understand how physics works TBH

Objects have momentum

[hasty plinth]

I guess you should check your hearing

[spring sable]

Bruh all you have to do is add a force proportional to your target velocity

And adjust the proportion factor to get scale

[spring sable]

2000 lines of code does not mean the code is good

Kind of the opposite

[spring sable]

This way it smoothly accelerated to your target velocity

No lerp needed

[coarse cove]

Hi, can someone help me with a potentially really simple problem ? ( I can't find the solution online though... ) Started learning unity making a 2d platformer game, and have been playing with the physics. For some reason I can't get surface effector 2D to push my character horizontally, it only works vertically even if I rotate the object and whatnot. Is there something basic I'm missing to control the direction of the force ? All I can change right now is up or down. ( I've seen tutorials on youtube where they use this but it works horizontally .... )

[quaint charm]

Tysm this was it
Had to adapt a bit for my project but this pointed me enough in the right direction!

[hearty owl]

I have a game with a car. I want the car to pause when I am in the pause menu. I found this thread where this guys suggested to set StepPhysicsWorld.Enabled to false. https://forum.unity.com/threads/pausing-physics-simulation.991616/#post-6439715 So I installed the Unity Physics package which in turns also install a bunch of dependencies like Burst, Collections, Entities, Jobs... I then added Physics and Entities to my definition file. And imported using Unity.Physics.Systems; in my script. And in the update loop I tried to set

  StepPhysicsWorld.Enabled = false;
} else {
  StepPhysicsWorld.Enabled = true;
}

But I am getting an error An object reference is required for the non-static field, method, or property 'ComponentSystemBase.Enabled'

[timid dove]

The usual approach is simply:

Time.timeScale = 0;```

Oh this is ECS just noticed

[hearty owl]

what value should I set it to resume?

[timid dove]

1

IDK if time scale is used in ECS or not

[hearty owl]

IDK what's ECS tho, I just installed that package based on what i google.

[timid dove]

You're definitely barking up the wrong tree then

[timid dove]

This is the way to pause the game

[timid dove]

You don't need any of these packages etc.

you've somehow stumbled across some posts for ECS physics which is completely unrelated to normal Unity Rigidbody physics.

[hearty owl]

Ahh no wonder it was so confusing.

Btw is it better to set timeScale if update or fixedupdate?

[timid dove]

Presumably you're pausing the game in response to user input

input should always be read in Update

Note that FixedUpdate will stop running while time scale is 0

Update will always run as normal - once per frame.

[hazy canyon]

can anyone explain why i just fly through the terrain?

[sterile thicket]

does the terrain have a collider?

[hazy canyon]

yea it has the normal terrain collider on it

[sterile thicket]

is the collider set as a trigger?

[hazy canyon]

nope

[sterile thicket]

hmm, I'm sorry I don't know why its doing that.

[hazy canyon]

hahah all good

[tropic trench]

@hazy canyon player has a collider? Continous dynamic collisions on player collider?

[hazy canyon]

player has a box collider.

[lime dawn]

I am trying to make a car controller for unity a realistic one or something like my summer car, I want it to be a manual car, I want it to have a clutch and the wheels and engine rpm to match but with gears and gear ratio in mind while clutch is not pressed I have been trying to ages can someone please help.

[safe juniper]

ive implemented the marching cubes algorithm for creating a destructible planet, the mesh creation/rendering is fine
but unity wont let rigidbodies have a concave mesh, is there some way around this?

[onyx lion]

hi guys, id like to know how to addd rigidbody force depending on the position of the bullet that hitted the player (the bullet hits player and moves his rigidbody back)

[timid dove]

AddForceAtPosition

[chrome cradle]

How to do a suspension system for a car using Unity's builtin components?

I'm using spring joint, but the tire seems to be disconnected from the attached rigidbody and thus is getting dragged by the vehicle.

I want the suspension to act like a shock absorber. So it smoothens out any bumps and potholes and doesn't just move with the terrain.

[shell night]

well if you'd attach a wheel to a spring in the real world, you'd get pretty much the same effect

[chrome cradle]

The problem seems to be that it is not getting attached properly

[shell night]

if its dragged behind the car, its attached properly to the spring

[chrome cradle]

Okay, how can I make it so that it doesn't get dragged?

[summer solar]

Does anyone know why the ball glitches through the blocks? It has a RigidBody Component and the Vector3 is inverted with *= -1 on the Z-Axis upon OnTriggerEnter().
The Collider Size of the Ball is standard and the collider size of the blocks is slightly extended so it overs the tiny empty spaces too.
https://i.imgur.com/mT5ZVJc.gif

[timid dove]

Because you're trying to do physics with trigger colliders for some reason?

[summer solar]

this is for a university project and we aren't allowed to use the physics engine. How else would I do this using only script-controlled objects?

[timid dove]

If you're using OnTriggerEnter you're already using the physics engine

If you're using colliders you're already using the physics engine

If you're using Rigidbody you're using the physics engine

[polar hawk]

my 2d rigid body physics arent working

my character has a dynamic rigid body and a collision box and the object its hitting also has a collision box and rigibody yet nothing happens when they hit each other

both are dynamic

[quartz sundial]

Make sure that both Collider aren't set to Is Trigger and don't move it with Transform if that doesn't help make sure that the layers of the Objects can Collide with each other.

[old eagle]

Can someone explain why this situation fires OnCollisionEnter event?

The image is from top view. Left box has Rigidbody attached, isKinematic is set to True and it's moving where the arrow shows (-Vector3.forward direction). The right box has Rigidbody attached, isKinematic is false and Rigidbody is sleeping. The imaged attached is when OnCollisionEnter is fired. Left box has a collider of size (0.7; 0.7; 0.7), right box (1; 1; 1). Physics Manager setting Default Contact Offset is 0.01. Collision detection is set to: Continuous Dynamic.

[polar hawk]

Can one of them be set to trigger?

[buoyant aurora]

Hey yall, got a small sliding issue here. Whenever the game is running, this tank keeps sliding to one of its sides. Dont matter if its a slope or not. What could be causing this?

[magic briar]

How do I add a collider to my tilemap. It's my first time working on them and I have no idea what I am doing. I want the player (which right now is a capsule) to be able to walk on the tile map. I would like it more if you dm me but is it fine if we do it here. I don't really mind.

[rare dove]

You can just google it, there's plenty of tutorials for that

[subtle hamlet]

can anyone say why this thing happens when i'm in play mode?

[quartz sundial]

No, Is Trigger disable Collision

[novel mortar]

Hi! I have some troubles with the chopping mechanic... As you can see I can't stay too close to the tree and chop it unless I am looking at it's top. Also you can see if I am at a certain distance from it I can finally chop it... So I have a script on the tree along with 2 box colliders and 1 sphere collider, and the axe got just a script and an animator. What could cause the problem? (Tell me if you would like to see the code)

[timid dove]

best to use MP4 for videos on discord:

• Many peoples' computers cannot play mkv files
• Discord cannot embed it

[novel mortar]

I got it, i'll repost it as a MP4

[turbid geyser]

How would I calculate the impulse force value required to move a given distance over a given time; given mass, drag, and no gravity?

[timid dove]

"reach a distance" doesn't really narrow down the requirements. any amount of force, with the object starting at rest, will have the object reach a particular distance

it's a question of how long will it take to reach that distance

[turbid geyser]

I suppose I mean to stop at a given distance. With drag, its not assumed it will reach a given distance--right?

[timid dove]

It'd be easier if you used a custom drag implementation

[turbid geyser]

But I will add given a particular time as well.

[timid dove]

since Unity's drag is not open source

[fluid galleon]

Making a bullet physics simulator.

My calculated y drop values are slightly different to the real world values. It doesn't matter so much early on, however once the distance travelled gets larger, the values get further and further away.

For example, drop at 200m is -23.2cm or -0.232cm. I get 28.39188 cm or -0.2839188m.
At 1000m, the drop is -4004.6cm or -40.046m. I get -1512.729cm or -15.12729m.

Values are for .308 lapua, taken from JBM ballistics website using it's simple trajectory calculator.

Anybody know what I'm doing wrong?

https://paste.ofcode.org/BqddspcGib9WQLBeZWrTZV

Please ping me if you reply.

Simulation uses these equations taken from wikipedia for Newton's drag.
https://en.wikipedia.org/wiki/Projectile_motion#Trajectory_of_a_projectile_with_Newton_drag

[forest lance]

Could be because of floating point precision. Consider using decimal type instead of float if you really need these numbers to be as accurate as possible

Though I would try using double first and see if it is precise enough

[timid dove]

No comment on the math etc but yield return new WaitForSeconds(0.001f); is not going to work well for you

[fluid galleon]

I was thinking something felt weird about that, could you explain more?

[timid dove]

If your code depends on that wait time being accurate it's not going to work

yield return null will wait one frame

WaitForSeconds with a tiny number is just going to wait for one frame usually

Which is likely to be a lot longer than 1 ms

It should be called "wait for the next frame after this amount of time has elapsed"

[fluid galleon]

that makes sense. Isn't that just update?

[timid dove]

If you want to tie it to the physics simulation time step you can also use yield return new WaitForFixedUpdate

[fluid galleon]

Thank you

[fluid galleon]

Will do thank you, although I did try it before and it threw up some errors so i just backtracked instead of attempting to fix them.

[fluid galleon]

there is a problem in that vector3 doesnt accept doubles 😦

[novel mortar]

Here it is with an MP4 file as suggested

[frozen socket]

I am trapped in quaternion hell

I have tried to achieve this system with some hacked together code and it kind of barely works, does anyone here know of a good way to clamp just the rotation on the x axis according to a maximum and minimum angle?

[obtuse abyss]

Hey everyone, I'm new.

I'm working on a simple top-down 2D game, and trying to impliment some physics-based nunchucks. Seems pretty simple. Everything is under a child object. The handle has a rigidbody with a fixed joint 2D to keep it in place. Two chain links each using hinge joints, and the striking end also with a hinge joint and a collider.

However, the hinge joints uuhhhhhh are extremely broken. The base drifts with changes to directional input. And the pieces just chaotically fly off with a mind of their own.

It seems to work if you stay still, but breaks very quickly under actual play conditions. Any tips for how to stablize this and make it more predictable?

heirarchy

how it's set up

At play, the right one immediately jumps right

Video of how quickly everything flies apart

[buoyant aurora]

My rigidbodies with spring joints keep sliding without any forces, what could be causing it?

[granite wave]

How are you moving the character? What is your script like?

How are your joints set up?

[slender jacinth]

my npc is going underground in second frame, can someone help me fix this pls

[coral mango]

That doesn't look like a physics problem. It looks like the pivot point of your sprite is different between the two frames.

[slender jacinth]

oh

thanks 😅

[scenic thunder]

How can I simulate air physics (or at least an simplified version of air that works well ) ?

[buoyant aurora]

Well its a tank, with a rigidbody. The treads have 9 spring joints each, with the tank parented.

No forces are being applied. It starts sliding as soon as it touches the ground.

[fleet blade]

So I've been trying to use cloth physics, and the mesh is tearing here

(I hope this is the right channel for this)

Can anyone tell me how to fix this?

[runic talon]

I have the following code where I'm checking the bounds of a gameObject before and after modifying its vertices, but for some reason the MeshCollider.bounds are not getting updated after the mesh is updated

// Get the mesh from the MeshFilter on the target gameObject
Mesh targetMesh = targetPbMesh.gameObject.GetComponent<MeshFilter>().sharedMesh;
// Get the MeshCollider from the same gameObject and set the sharedMesh for it
MeshCollider targetMeshCollider = targetPbMesh.gameObject.AddComponent<MeshCollider>();
targetMeshCollider.sharedMesh = targetMesh;


// Check what the bounds are before we modify the vertices
Bounds boundsBefore = targetMeshCollider.bounds;

// Translate the vertices in a way that should modify the bounds
targetMesh.vertices = targetMesh.vertices.Select(TransformVertex).ToArray();

// Check what the bounds are after we modify the vertices
Bounds boundsAfter = targetMeshCollider.bounds;

// boundsBefore == boundsAfter ???

// I have also tried these before getting the boundsAfter, with no luck:
// targetMesh.RecalculateBounds();
// Physics.SyncTransforms();

Does anyone know how I can force a recalculation of the MeshCollider's Bounds after modifying the mesh's vertices?

[bleak umbra]

set the sharedMesh to null, then assign a new mesh

[runic talon]

At what point in the code should I set the sharedMesh to null and to the new mesh? Do I have to create a new Mesh instance or can I reuse the one I modified the vertices on?

Also thank you for the response 🙂

[bleak umbra]

you can reuse the old one

its just the only way i know of how to trigger the cooking at runtime

you aren't supposed to actually do this btw, its very bad for performance, so don#t do it every frame, it forces the physics engine to do a lot more than just make a collider mesh

[runic talon]

This is actually happening during Edit mode, not at runtime at all

At what point in the code should I set the sharedMesh to null and to the new mesh?
Still not sure about this 🤔

[bleak umbra]

whenever you like

If prior to setting sharedMesh any of the vertices, indices or triangles of the mesh have been changed then the shapes of the MeshCollider will be rebuilt.

you just have to set it to null first if its the same mesh, else it wont trigger

(this is all undocumented afaik, and the implementation is not public)

[runic talon]

Thanks! It wasn't working at first but it was due to my own issue, just got it working!

[timid dove]

<@&502884371011731486>

[potent ice]

Are you still looking for an answer to this? if so dm me

[shell dove]

I wan this box too have triggers so it can interacte with the car but when I turn the rigidbody on the cubes just falls right trough the mesh of the road and when I turn the trigger checkbox off it works perfect. Do anyone know how to solve this problem?

[potent ice]

Rigidbody is used to apply physics to an object this means gravity will affect it. That is why the object falls. If you apply a box collider with the Trigger checkbox not ticked (default option) it will be a collider meaning that it checks for collision and the physics engine acts accordingly (the car will bump it and it wont fall through the floor) checking the Trigger checkbox makes this a trigger box these do NOT collide with anything it only checks if another trigger/collider is touching or intersecting it. These can be used for stuff like checkpoints or finish lines where you want to check if the Player reached the trigger but you also want to let him walk inside the trigger

[shell dove]

But the road have a collison and the car can drive on it perfectly and the box too, but when i turn on the trigger then it's falls trough the road. when I not have the trigger checkbox on the box do not fall trough the road and everthing works fine

[potent ice]

This is how colliders and triggers work. When you want to have collisions between 2 objects you have to have at least 1 Box Collider with the Trigger checkbox turned off. Otherwise the Collider is not a collider but a trigger. I would suggest this video that explains it
https://www.youtube.com/watch?v=S0MXZ6AXzTE

[shell dove]

Thanks🖐️

[sour pivot]

Hi, I'm looking for any advice or suggestions to maximize performance for a somewhat niche use of Unity's physics engine.

I've been working on a VR music making environment consisting of "notes" (just a collider which is a trigger) which can be played with "mallets" (kinematic RB, non-trigger) or "sport balls" (non-kinematic RB, non-trigger) .

Since music events happen at a much higher framerate than 90, much of the interaction happens in FixedUpdate and I've dialed FixedTimestep down to .005 which seems to make the feel of hitting a note with a mallet more responsive.

Another thing happening in FixedUpdate is the processing of MIDI beatclock. This is a simple MIDI message that is received 24 times per quarter note, actual time subject to the BPM set in a DAW. I'm using these clock ticks to Rigidbody.MoveRotation of "geared" wheels which have child mallets, resulting in a clockwork musicbox style sequencer of sorts. Each wheel subscribes to an Action<int> OnMidiClockTick which is invoked in FixedUpdate where a buffer of received MIDI messages is processed.

Here's a demo video for context https://www.youtube.com/live/K_uy4AHiHgc?feature=share&t=1630

[sterile thicket]

Why do my enemies move forever and dont stop until they hit a collider, and how can i fix this?
Here is the rigidbody inspector for the enemy:

Also this is a 2D game

wait nvm, i just added linear drag and it fixed it

[timid dove]

Look up Newton's first law of motion 😉

[sterile thicket]

lol

[sour pivot]

What's your expectation? Linear Drag would add friction if that's what you're looking for.

[sterile thicket]

yeah, thats what i needed

[pine blaze]

is it possible to edit the extent of a 2D circle collider instead of just its radius?

[timid dove]

The only "extents" a circle has is the radius

[pine blaze]

In the editor it has an extent section, but the editor locks it. Didn't know if there was a way to unlock it.

The bounds I meant

mb

[timid dove]

That's the bounds

You can't edit it no

Only through changing the radius

It's just the AABB circumscribing the Collider

https://developer.mozilla.org/en-US/docs/Games/Techniques/3D_collision_detection

https://developer.mozilla.org/en-US/docs/Games/Techniques/3D_collision_detection/rotating_knot.gif

[pine blaze]

Got it. I want a capsule collider but not sure how to do what I want to with the capsule collider. What would be the equivalent of the radius in a capsule collider? Just the bounds?

[timid dove]

Not sure I understand the question

Capsule colliders also have a radius BTW

What are you trying to do

[pine blaze]

So in code I get the radius of the circle collider by referencing _circleCollider.radius. What would the equivalent be for the capsule collider?

[timid dove]

The same thing

Just with a CapsuleCollider2D variable

[timid dove]

^

[pine blaze]

Weird. it returns an error for me when I try to reference the radius of a capsule collider.

[timid dove]

What error

Show your code and the error

Oh sorry apparently the 2D one works differently

https://docs.unity3d.com/ScriptReference/CapsuleCollider2D-size.html

But again can I ask exactly what you're trying to accomplish

You want the "radius" of the Collider but for what purpose

[pine blaze]

Applying a force, Vector3.up times - capsuleCollider.radius times the transform.localscale.y of the object its attached to. so in code...

[timid dove]

Why 🤔

[pine blaze]

ModelContainer.gameObject.MMGetComponentNoAlloc<MMFollowTarget>().Offset += Vector3.up * -_circleCollider.radius * this.transform.localScale.y;

Except I want to use a capsule instead of a circle collider

To apply a jump force

[timid dove]

That doesn't look like applying a force 🤔

Anyway I've shared the relevant property

[pine blaze]

the size, I see. Thank you 👍

[bold yew]

Hello. I'm working on a game with a really simple block based vehicle building system. Wedges, corner wedges, inverse corner wedges, and cubes are available so far. Is there a good way to combine the individual colliders of these blocks into largerconvex shapes to help optimize physics performance?

[timid dove]

in 2D yes

[bold yew]

Well that's unfortunate :]

[vale monolith]

Hey everyone, did anyone tried to work with cloth more in detail.
Simply what i want to do, that the cloth will not let you get through, but instead rather will fall over.
Anyone did something like this ?

Here as you can see cloht physics behave perfect:

But when you try to go up with your object the cloth will start to "scater" and object is getthing through.

Instead of rather flipping over to the other half of the cloth.
Any suggestions how to achieve such behaviour of cloth ?

[night remnant]

I'm using a rigidbody for a movement controller and calling a rb.MovePosition() in a FixedUpdate(). I'm having an issue where when the player controller continually tries to move against a wall, it will climb up over the wall basically and I don't want it gaining any height by spamming movement into the wall.

Are there settings I should be adjusting to make sure this doesn't happen?

[gaunt walrus]

Using UnityChan's spring bone script for a character model and it gets this really bad jitter when moving, is there a better alternative or any fixes?

[still crown]

so one of my game objects suddenly refused to move at all, it used to work fine but now it's not affected by gravity at all and it won't follow the player as intended so idk what's wrong

it's really weird it used to work fine before

[timid dove]

Presumably you've made some change to code or something.

Or the object or scene configuration

had to say without further details

[terse topaz]

Hey so quick question. I'm trying to do some compensating for changing the gravity scale during a jump for hang time, and the transition might happen between frames, so I'm trying to figure out how to account for that. It shouldn't be too difficult, but things just aren't adding up. So I decided to do a simple experiment and try to predict the next height and vertical velocity given a current vertical velocity and gravity. Weirdly though, it predicts the next velocity no problem, but not the height. I'm guessing it has something to do with the math I'm doing, and was hoping someone could take a look

here's the debug output for current and predicted velocity and height (spat out every FixedUpdate where the player has a positive vertical velocity)

and here's the code

[timid dove]

It's just:

Vector3 nextVelocity = body.velocity + Physics.gravity * Time.fixedDeltaTime;
Vector3 nextPosition = body.position + nextVelocity * Time.fixedDeltaTime;```

[terse topaz]

I'll try tweaking it to that and see if that illuminates anything for me

[timid dove]

The whole 1/2 gravity * time^2 thing is an idealized formula for real life gravity.
We're in a computer simulation using fixed timestep discrete simulation.

it's not quite the same.

[terse topaz]

I see, so the physics engine is not calculating next position based on acceleration, but rather calculating the next velocity, and how far it would have moved at that new velocity?

(using acceleration to determine the next velocity, though, of course)

[timid dove]

yep it's just something like:

• apply gravity to all object velocities
• apply all added forces to object velocities
• resolve collisions
• move every object according to its velocity

[terse topaz]

I wish to scream ʘ⁠‿⁠ʘ

but I get it. Harder to figure things out like that

thanks for the help!

and for posterity, just confirmed it

wait a minute. That means I can't predict what jump velocity is needed to reach a certain height, no?

(unless I step it out)

[unkempt dirge]

i would use rigidbody 2d and just add to rigidbody.velocity
i would also calculate friction in the player script. To do this I literally just check if the player is trying to move at all in if he’s not, divide the speed by a number that will get you a sliding effect as long as the / number is something small
@stuck bay

[shut coral]

I have this barrel and I'm looking for a cylindrical collider. I do not want the barrel to roll like a sphere but when I use a capsule collider that's what it does. I want a flat base on the bottom and top.

[uneven pine]

there is no cylinder collider in unity, so you either need your own custom collision method, or you can simply frezze the rotation on the capsule collider. Or you can have a mesh in the form of a cylinder, disable the mesh renderer put a convex mesh collider on and then set the barrel as a child of the object

[unique cave]

No need for parenting, you can select any mesh you wish for the mesh collider, it doesnt need to be the one from mesh filter

[timid dove]

A convex mesh collider with the existing barrel mesh is probably the simplest approach here

[shut coral]

I'll do this one, thank you. I don't want to freeze the rotation with a capsule collider because I want it to be able to roll.

[nimble coral]

anyone know how 2 fix

[long nimbus]

Greetings

I am new to unity and trying to set up a 2D game in top-down view

The problem I have is with my colliders

Specifically 2D box....

It has zero height when the object is aligned to XY with Z up axis, and is aligned to XY axis when the object is at XZ with Y alignment

Photos follows

In the top, the object is aligned to XY with Y up, while the second picture shows the object aligned to XZ with Y up

And in first case the 2D collider cannot be resized, while in the second it is aligned to the wrong XY axis

[wide nebula]

2D only exists on the x/y. If you want z, use a 3D collider.

[long nimbus]

I do not want to use Z

I just want the collider to be the full size of the map board

In the first case it cant be resized to the full map and in second it can be resized but in wrong axis

no matter what size I input in the inspector module or try to drag the green boxes, it wont be resized in the first base

And in second, as I said, it can be resized, but the map is now in wrong axis

I can take a video

[wide nebula]

Sure

[long nimbus]

Either way

Should I use XY or XZ for 2D game?

Top-Down

Cause the 2D editor button puts me to iso/ortho view to XY with Z up

this I mean

so I thought it should be XY with Z up towards the cam

[inner thistle]

If you want to use physics then it has to be XY

[long nimbus]

well I use the colliders only to detect mouse clicks and whatnot

but yes

thanks you for elaboration

[inner thistle]

and even if you don't use physics then XY is infinitely more convenient because things like Vector2 are XY

[long nimbus]

indeed

I heard Vector3 up in unity is Y tho

so I wondered if it should be XZ with Y up

Anyway....somehow I inputed extremely large number and it works now

[inner thistle]

In 3d, yes. You have 2d.

[long nimbus]

Yeah ik

I just use vector3 s so I can layer stuff on top of each other

it worked at 7 million size

😄

am I doing something wrong?

[wide nebula]

Did you import that mesh?

[long nimbus]

nope

[wide nebula]

Is it a child of another object?

[long nimbus]

nope

it is the unity plane obj mesh

at the top of hierarchy

[wide nebula]

Show your whole editor

It's pretty massive looking, just based on how far into the screen canvas it sits. Drop in a default cube and see how the size differs.

[long nimbus]

kk

[long nimbus]

Yeah I know its massive, thats why I am seeking help

something seems off to me

😄

And thank you very much for looking into it

[wide nebula]

Can you put the cube in?

[long nimbus]

replace the plane with a cube or 3D cube collider?

[wide nebula]

Just drop a cube in to verify this is very big. Just curious.

[long nimbus]

ah

[wide nebula]

Huh

[long nimbus]

I know right

Something is weird

[wide nebula]

Can you reduce the y-offset to 0?

[long nimbus]

sure

nothing changed seemingly

I also set X offset to 0

cause why not

[wide nebula]

Oh, reduce the 7 million to something like 10, too.

[long nimbus]

yep

we re back to noodle

aka what it used to be when I came with the problem 😄

[wide nebula]

Well, I have no idea. Use a 3D collider I guess?

If you use the 2D collider on the test cube earlier, is it the same issue?

[long nimbus]

yeah, 3D box collider works just fine, but there is one issue related to it

yeah, 2D collider works weirdly on everything

it works fine only if I have the obj aligned to XZ

[long nimbus]

I wanted to discuss a second issue in this server related to this, and that is ScreenToWorldPoint conversion which is seemingly always off for me

thats why I wanted to use 2D collider since I thought the 3D might be messing that up

[wide nebula]

Oh, you had it at 90 rotation before, I see now.

[long nimbus]

but I will bring that up in #💻┃code-beginner channel

[wide nebula]

Make an empty object, no rotation, child the rotated plane to it and put the collider on the root.

[long nimbus]

Oooh

so thats the issue

it must be 0 0 0

Thanks very much

[wide nebula]

Yep, you were rotating something that exists conceptually in only the x,y world into the 3rd dimension. Hence the line, it just essentially shrinks.

[long nimbus]

all right

to the second issue! 😄

[terse topaz]

Does anybody have a good way to calculate the gravity and vertical velocity necessary to reach a given height with a given end velocity in a specific amount of time?

I know the regular kinematic formulas don't apply because of how Unity manages the physics and I have a suspicion that this would've been covered by something in highschool math, but I'm drawing a blank

[twin nebula]

Can anyone tell me why when using config joints I lock Angular Y rotation but if the joints move around enough they still rotate on the Y axis?

[elfin flax]

Hey Does Havok Physics works with Netcode for Entities?

[hexed swan]

I have an issue occurring in my game and I can't seem to solve it.
I have a box collider set to "is trigger". Then I have a player with a rigidbody with continuous collision detection. The player also has a box collider. When the player is moving around inside the collider everything is fine. But if I stand still for a few seconds Unity keeps detecting that I'm constantly exiting and entering the collider, even though I'm staying inside it. Anyone knows what could be causing this?

I've tried moving around the box collider of the dog and changing the collision detection mode but nothing seems to be working. I am also calling rigidbody.WakeUp() inside Update

[timid dove]

If you set sleepThreshold on the rb to 0, it will never sleep

and you won't have to do the WakeUp thing

[hexed swan]

I did this and the rb never goes to sleep but it still keeps detecting the enter/exit

sometimes it's not an issue but sometimes it keeps detecting every single frame and slows down the game

[timid dove]

you'd have to show your setuop

unless the objects are moving it shouldn't happen

[hexed swan]

okay I'll send it to you tonight, as I have to go now

(it's 6pm where I live)

[rugged galleon]

How do you do hurt boxes in topdown games, where the collider is different from the hurtbox? Currently I have a collider at the base of my character and trigger for the hurtbox, plus a trigger on the bullets. Problem is the bullets collides/enters both of them, which results in double damage.

[timid dove]

use layer based collisions

the bullet's layer should not interact with the character's base collider layer

[rugged galleon]

yeahh, how did I not think of that earlier

[blissful lotus]

hey have you guys noticed that if gravity is on for a rigibody and add forces to that body it doesn't calculate the iteraction properly?

[sullen current]

I've got a situation where I'm using Physics.Ignore collision on 2 colliders, but the strange thing is even though these colliders don't physically bump eachother they still seem to call on collision events on the scritps that are on them. Is that how it's supposed to work? If so is there a way to also stop these collision events from being called between those 2 objects?

Follow up question I want an object to not have it's velocity effected only when it collides with a particular type of object while it's in a particular state.

What I've been doing is storing the velocity from fixed update and applying it after the collision on collision enter and stay, but this doesn't seem to give me the desired effect, It's velocity is still modified by the collision in some instances. (it sort of works most of the time)

[bleak umbra]

Maybe you could be looking into putting objects on different layers and set up collisions between those layers

[bleak umbra]

This is also what physics.ignore is for. You would maybe detect an upcoming collision with a larger trigger collider or raycast and then call .ignore() if the collision should be ignored

[sullen current]

So physics.ignore is supposed to ignore all collision events too then? I noticed it called collision exit if it was touching the object you used it on.

[bleak umbra]

Bit fuzzy on the details but you may have to use it before the collision occurs or disable the colliders before calling it to prevent the callbacks from happening

[sullen current]

That makes a lot of sense. Thanks for your help. That does help clarify some things. The situation I'm in is very particular since the rest of the project is very locked down at this point.

[uneven pine]

you should be able to do it with kinematic equations and simply calculating hoe much force you need to apply to reach there

[terse topaz]

No dice. Unity looks at the velocity you were going for the previous frame, cuts it depending on the applied forces (like gravity), then moves you at that speed for the fixed delta time. So it doesn't quite work out the same

[terse topaz]

So far I've figured out that if I use the normal kinematic functions to figure out what the gravity and starting velocity would normally be, but then add half of how much velocity would be lost by the first frame to the normal velocity, then it tells me what the initial velocity should actually be

Only catch is that the ending velocity is not what you might expect, and I don't actually have a proof that this is how the math would work out. I just did it by hand a few times with different scenarios and it seems to work

[timid dove]

No, I haven't noticed that.

I don't think it's true.

[blissful lotus]

I had to restart Unity
For the physics intersections to work properly

[ruby spade]

Should an axe with a collider, attached to the hand bone of a RB character controller detect collisions with a Treed model that has a collider on it. Both colliders DO NOT have is trigger checked. All objects are on on the same layer.

[silver moss]

The OnCollisionEnter message will be sent to the object that has the rigidbody, not necessarily the one that has the collider

So in this case it would be sent to the character and not the axe

Also if the axe (or the hand holding it) is animated with traditional animations it will likely not register collisions properly

[ruby spade]

thank you, I am having an abnormally hard time with collisions in this project. I will look into it further.

[silver moss]

If the problems persist, walk through this, it's pretty handy:
https://unity.huh.how/programming/physics-messages

[ruby spade]

That’s damn handy. Thank you.

[haughty wave]

hello i am trying to shoot raycast out of a car gameobject can anyone direct me to some code or somehow explain how to shoot them out(im new to raycasts) Ping if you can help

[timid dove]

Google Unity Raycast and look at examples

[sour fjord]

https://media.discordapp.net/attachments/412218424471584769/1096693431797043210/image.png The problem that I'm trying to solve is physics based, but the thing I'm stuck on now I've managed to abstract into this pure math problem. Given the coordinates of A, B, C, and D, and that AB and AE are the same length (and of course, that, as in the image, E lies on CD), how should I go about finding the coordinates of E? If there's a better channel for this, I'll be happy to post it there instead 🙂

[steep widget]

I have a scenario where I have a tilemap with some roads for example, and over these there can be things like trees that you can interact with. The problem is that the colliders for the roads mess up my mouse interactions with the trigger colliders on my trees, meaning that only some parts of the trees detects my mouse.. If I remove the roads everything works fine. What is the correct way of solving issues like this?

[bright sluice]

hi, how can I prevent my player from losing momentum when he is attached to a distance joint ?

[timid dove]

a joint won't inherently make you lose momentum. Likely your code is doing this.

[bright sluice]

this is the only script that changes values of my distance joint 2D :

void Update()
    {
        if (Input.GetMouseButtonDown(0) && checker == true)
        {
            RaycastHit2D hit = Physics2D.Raycast(GameManager.instance.cam.ScreenToWorldPoint(Input.mousePosition), Vector2.zero, Mathf.Infinity, layerMask);
            
            if(hit.collider != null)
            {
                Vector2 mousePosScreenToWorld = hit.point;
                rope = gameObject.AddComponent<DistanceJoint2D>();
                
                rope.enableCollision = true;
                rope.connectedAnchor = mousePosScreenToWorld;
                lr.enabled = true;

                checker = false;

                lr.SetPosition(1, mousePosScreenToWorld);
            }
        }
        else if (Input.GetMouseButtonUp(0))
        {
            DestroyImmediate(rope);

            lr.enabled = false;

            checker = true;
        }

        if(lr.enabled == true)
        {
            lr.SetPosition(0, gunTip.position);
        }
  }```

[timid dove]

ok and what about scripts that affect your Rigidbody?

[bright sluice]

I have my player movement script : https://pastebin.com/MB8ZTGpp

[timid dove]

rb.velocity = new Vector2(horizontal * speed, rb.velocity.y);```

You're doing that every frame

The rope isn't going to freely be able to swing you when you're tightly controlling the horizontal velocity like that

If you want to leave this all unchanged I suggest going into a different mode when swinging on the rope where you control things solely through forces

[bright sluice]

what should I do then ? and if "horizontal" is at 0, the horizontal velocity will be 0

[timid dove]

I just told you

And yes that's exactly the problem

[bright sluice]

ok I understand

thanks I'll try to fix that

[modest cape]

could someone please help me with this issue, both oracles have a collider and they also both have the same ontrigger script. however 1 works and 1 does not.

i kept the record resolution down so i could save some space to show

[dreamy hollow]

Hey, i make a hobby project like a reaaaly simplifed Kerbal Space Program... Very Simplified.

For my Rocket Physic, the Rocket has an Rigidbody.
I like to "implement" the function that, the player can enter the ship and thats the problem.
When im using a mesh collider with convex, than i cant enter the ship because the complete hull is a collision.
without convex i cant use the rigidbody, because i dont want to active kinematic, because eeehm, i need physics. xD

Maybe, anyone has an Idea?

[primal crow]

Personally, I would split the hull into several box colliders for the walls, and other primitives to replicate the rest as close as I can, which would also likely improve performance as well

[rotund lagoon]

I don't understand the purpose of the static rigidbody. For example if I setup a floor with 2d colider and 2d static rigidbody, I can then have a dynamic 2d rigidbody fall onto it and stop....however if i remove the 2d static rigidbody, so that the floor has only a 2d colider it still works fine...so what's the point of the static rigidbody?

[uneven pine]

yeah check when the player shoot then enable the colliders

[chrome cradle]

Hello,

I have a vehicle with a bunch of colliders inside of it and it seems like they are being used for rigidbody physics calculations seen as Physics.SyncColliderTransforms is taking a lot of time.

Is there a way to keep colliders parented to a rigidbody but without making them a part of the calculations?

[timid dove]

Counter question - what would be the point of colliders that are not part of the physics calculations?

[chrome cradle]

It's core to the gameplay of my game. You are supposed to shoot modules in vehicles and disabling them will cause different effects to happen in the vehicles.

Here's a hitbox model of a BMP 2.

Blue effects gunnery, Red effects mobility, Orange is fueltanks, Yellow is ammunition, Cyan effects communications, Purple is external armour.

[verbal monolith]

I have this problem that the pickup able objects can phase through walls, Is there any fix for that?

[tropic trench]

how are you moving the object

[verbal monolith]

here is the script. Sorry if it is a bit messy, didnt get to clean it up yet

[timid dove]

move the object via RB velocity instead of however you're doing it now.

[terse topaz]

I just realized that floating point math is gonna screw me over trying to figure out physics calculations. Is there any way to compensate for this? Or do I just have to take the hit and rely on rough approximations?

[timid dove]

Depends what you're trying to do

[terse topaz]

I'm trying to predict what gravity and vertical velocity are needed to play nice with Unity's logic so that the object reaches a specific height within a specific amount of time

I've got the math worked out, but then there's this

[timid dove]

plugging in magic numbers isn't really useful

unity's physics is going to be calculated with the same 32 bit floating point math that your prediction code will run with

so while floating point precision error is annoying - it shouldn't cause any drift from the math your own code can do

[terse topaz]

that's what I'm kinda hoping for

like it'll cancel itself out

but it doesn't seem to be playing out that way

I'll try a few more things and see what happens

[timid dove]

• your math could be wrong
• you could be operating with assumptions like "no drag" which might not be true about your Rigidbodies
• your code could have a bug

[terse topaz]

right, I'm doing small scale tests just in the c# interpreter to see how the math would theoretically play out

so far I've got the following formulas figured out:

D = Vi * N + A ((N^2 + N)/2)

D = Vf * N - A ((N^2 - N)/2)

N being the number of frames, and units being measured per frame rather than per second

Also, to calculate a peak of a jump, I gotta do:

D = (-A/2) * N - A ((N^2 - N)/2)

it uses the second formula but Vf = -A/2 (because if the velocity were to reach zero, it would be at the same height for two frames, and this offsets that so it's only at the peak for one frame).

Then just scaling up the velocity by multiplying by 1f/Time.fixedDeltaTime, and acceleration by 1f/Time.fixedDeltaTime^2

Ok, it seems to be working, but it's just not perfect

I don't think I'm gonna be able to get it perfect though, and it's literally like 0.00001 units of distance off so not the end of the world

[terse ginkgo]

You can use joints instead

They are made for this lol

Assuming your character is a rigidbody at least

[feral shell]

how can i configure the box collider of a bomb, to allow going out of it but not in
in other words, player will not be pushed away when he throws a bomb, but when he is outside the collider, he cant go back in
i thought of using four 2D colliders for each wall, so the back face would allow passing trough, but that cant be rotated

[terse topaz]

The character is not attached to anything and it's for their jumping physics, so I'm not sure a joint would work here

[terse topaz]

Looks like your solution might need some code. I found this which seems to be what you're looking for:

https://docs.unity3d.com/ScriptReference/Physics.IgnoreCollision.html

[stuck bay]

bomb bots arena straight copy

[feral shell]

never heard of that, just trying to learn unity by making retro games

[feral shell]

thanks!

[timid dove]

you mean... bomberman?

[stuck bay]

no

https://store.steampowered.com/app/754050/Bomb_Bots_Arena/

Steam

Bomb Bots Arena

Bomb Bots Arena is the ultimate multiplayer bomb brawler experience!Bomb Bots Arena is a bombastic online multiplayer brawler (B.O.M.B) that lets players compete against frenemies and online players around the globe.‍Players get to customize their very own Bomb Bot and send it into battles in order to level up and unlock new abilities. Punch you...

▶ Play video

[timid dove]

Seems like a Bomberman clone

[gritty tree]

i have a player and the movement system and everything is fine but the problem happens when the player collides with the wall. the player starts jittering and going into and out of the wall super rapidly instead of coming to a stop. it starts shaking the camera and everything.

the player movement uses transform.forward to move

[timid dove]

Sounds typical of moving your Rigidbody via its Transform rather than by using the Rigidbody methods

the player movement uses transform.forward to move
That's just a direction vector and not a movement strategy

[gritty tree]

yes i thought that was the issue i just wanted to confirm. i have already started changing the movement script

[inner niche]

is there any way to do physics faster without changing mass or gravity ? like run at a 2x clock ?

[timid dove]

Time.timeScale = 2

[inner niche]

nice that works like a charm, can you run different scenes at different timescales or is that to much to ask ? 😄

[timid dove]

Sure just set the timescale to whatever you need in a script on each scene

[tulip furnace]

Hello all

I have a scene where I would like to make the 'level' eventually into a physical product

the marble like physics that i am trying to replicate and the surfaces that it contains is only 0.4 x 0.4 unit scale (400mm), See a 1m cube next to it for reference

once I get down to that level, it is super hard to navigate the scene. It is recommended to keep everything at real world scale so that physics works correctly. Has anyone tried to do something similar, and am I taking the right approach?

[rotund lagoon]

How can I make my 2d physics bounce angles just mirror across the collision normal? The debug lines on my image are the calculated lines with each bounced mirrored...but the physics engine differs from this slightly. I've been trying to tune the Physics material of the bouncing object but I just can't get it to match with the lines; there appears to be a degree of randomness.

[winged dew]

I don't know about other mechanics in your game, but is using the physics engine even necessary? Couldn't you just script the movement so that when it hits walls it will reflect it's velocity over the wall normal

[kind grove]

I have a little game going. I have a gun and when I shoot my enemy they get knocked back the velocity doesnt reset so they keep on getting shoved back until they hit a wall

I want it reset though, is there a way to fix this without having to make a script specifically for making it act normal

[timid dove]

Normally you'd have friction with the ground

I'd guess you've disabled that with a physics material

[pine blaze]

In 2D, is there a chance that a trigger collider could end up being completely ignored if a rigidbody moves fast enough through it, and/or if said collider is also very thin? I'm trying to implement a goomba stomp mechanic. If the player is falling at a slower speed, the trigger collider seems to work properly and destroy the enemy when it's landed on, but whenever the player falls at a fairly fast speed downward, sometimes the player dies when landing on the enemy, and I can't find any other reason that it wouldn't be working properly at higher speeds.

[timid dove]

yes

[pine blaze]

Is there anyway to remedy this other than making the collider larger or changing the gravity so the rigidbody doesn't fall as fast??

[timid dove]

You can do your own manual Box/Calpsule/Circle casting

or switch to non-trigger colliders and continuous collision detection

[stuck bay]

i have the box colider

and rigidbody component added to my cube and game object

but their not falling down on to the cube

[timid dove]

screenshots

[stuck bay]

i meant to say that

the floor is now falling with my objects

[timid dove]

you gave the floor a dynamic (non-kinematic) Rigidbody then

generally you don't want that

[stuck bay]

ah ok

what component should I use instead?

i tried to click on is kinematic for my ground

but that made 1 of my objects freeze in the air and the 2nd one fall through the floor

but my floor doenst fall though now

[timid dove]

The ground doesn't need a Rigidbody at all, or it can just be kinematic

[timid dove]

#⚛️┃physics message

[untold trench]

So I have this issue where doorways and things with ceilings prevent the player from entering and collision only works if I sprint and jump into the collision, which will allow the player to pass through. Is there anything off the bat I should check? I've already tried all different skin widths on my character controller, changed step offset and slope limit as well, no luck.

[zealous phoenix]

The image of the colliders doesn't show much more than yellow spaghetti, just saying.

[errant gazelle]

How would you go about making an active ragdoll hold a weapon and attack with it? Should I give the weapon a fixed joint and attach it to the ragdoll's hand and then for the animation?

[stuck bay]

@timid dovewdym just a kinematic?

1 of my objects freeze in the air and the 2nd one fall through the floor
but my floor doenst fall though now

[timid dove]

You've hidden the Rigidbody settings so I can't see