⚛️┃physics

[timid dove]

Both objects seem to be below the cube based on y position though

I meant that the ground can either have no Rigidbody or a kinematic Rigidbody and it won't fall

[stuck bay]

my rigidbody settings are the default ones I never changed them

[stuck bay]

i moved the cube a little bit below my objects and when i hit play now their both frozen in the air

[timid dove]

Show them

And show where these objects actually are

And the hierarchy

It's hard to help when I can't really see anything

[stuck bay]

when i hit play now

they both go up in the air for like a second then freeze in the air

[timid dove]

Where's the collider gizmos??

See how the colliders are in the floor?

[stuck bay]

what is that

[stuck bay]

and their above the floor

[timid dove]

That green box is your collider @stuck bay

Your mesh is offset from the object's actual location

The collider is inside the floor

Hence popping up in the air

You need to actually pay attention to the positions of the mesh and the colliders etc

You'll also generally want to use the Move tool

So you can see your object's pivot

[stuck bay]

my car is over the road now

and its still floating

and when i put it below or right above the floor it falls through or floats

im not sure where i should put it

is using the box colider even the right thing

to add car physics & to stop them from falling through the floor

[stuck bay]

i only had a rigidbody at first and i added a box colider because i thought it would to that

[shell dove]

Hello, i want my player not walking around on ice so I made an phsyicsmaterial, and changed everthing to 0 to make it everthing from ice but when i assign it to the floor, the player is still walking around like it would be ice, do someone know how to solve this issue, and sorry if it is a bad question. Thanks!

[stuck bay]

nvm after looking online I added my box colider around my car and that fixed it

[timid dove]

0 means no friction

No friction is like ice

If you want friction don't make it 0

(there's friction by default btw)

[stone pond]

how do I stop the rigidbody collision between the prefabs?

I don't want them to hit one another

[torpid bolt]

Hey yall, i got a weird question, my player character functions like this hitbox wise, they have a circle hitbox on the bottom that is half their size and a square hitbox on top for their torso, when crouching, the top one disables and the crouch anim starts, but this causes a problem, whenever the player jumps onto a corner of a surface, because its a circle hitbox, they can walk up the corner instead of just falling off, if i turn off the slippery physics for the circle collider, they just get stuck, any ideas on how to fix this?

they also slide off if they stand still on the edge

[timid dove]

layer based collisions
or
Physics.IgnoreCollision between their specific colliders

[timid dove]

use a box instead of a circle?

[torpid bolt]

I guess i should try that, im using this project to learn unity and followed brackeys tutorial and he provided a script for it that im not 100% fluent with yet, but ill try

[river hazel]

Hello, might be a basic question, but I was wondering why I keep falling off the terrain edges? Thanks!

[shy walrus]

Anyone know why my particles with world collission seem to fall through the floor planes after colliding with them?

they clearly do collide, but fail to stay sitting on them. It's as if they have an inbuilt mechanism to only collide with each plane once, then disregard it

[rotund lagoon]

I want to do a Physics2D.CircleCastAll across a tilemap collider... but for some reason I'm only getting the first hit, not all the tiles which were hit. How can I detect all tiles that have been hit by the raycast/

[open widget]

Colliders question:

I want to instantiate multiple gameobjects in one location

Problem: due to them having colliders, upon spawning, they instantly exert force on each other causing them to "explode" from each other

Is there a way similar to rigid velocity limit to prevent this, and make them move away in a slower and smoother manner?

[muted field]

I hope this is the right channel, I'm having trouble adding a mesh collider to a cylinder.

• I create a Cylinder
• Remove Capsule Collider
• Add Mesh Collider, it autoselects Cylinder as Mesh
• Add Rigidbody
• It falls through the floor

Any ideas?

Ah, setting convex seems to solve it? Hm

[quartz wyvern]

Trying to set vertices in my 2D Polygon collider but i get this error:

Failed setting path. Index is out of bounds.
UnityEngine.PolygonCollider2D:SetPath (int,UnityEngine.Vector2[])

for this second line:

        _polygon2D.SetPath(0, _verts.ToArray());
        _polygon2D.SetPath(1, _holes.ToArray()); // here

any one know why that is ?

do i have to set how many paths before hand ?

[timid dove]

You need to set https://docs.unity3d.com/ScriptReference/PolygonCollider2D-pathCount.html first

[quartz wyvern]

ah thank you @timid dove don't suppose you know if unity has their source code available for how they triangulate the polygons?

[ionic knot]

whenever I move the PlaneWithHole slightly, its Mesh Collider will collide with the Cylinder correct
but If move it after the Cylinder has fallen half way through the plane, it will just ignore the upper half collider and went through it

and it's the same in multiple game engines, so I assume there is something I'm missing here

[zealous phoenix]

Anybody know what's going on? I'm using the Character Controller and no scripts introducing motion to the player.

The only script I have is to make the player move around. If I have gravity disabled on the character's rigid body like I want, it just continues to go up.

[timid dove]

You should not have a Rigidbody and a CharacterController on the same object

Unless the Rigidbody is marked as Kinematic

[toxic raptor]

hi im making brick breacker but my ball is sticking the wall . How can i solve this issue ?

[carmine basin]

I have a very odd use case that I pretty much need - The concept is a simultaneous turn-based ragdoll fighter, where you control the joints of your character to fight.
While the players are planning their turns, I need to somehow freeze the rigidbodies of the characters, but still display a ghost/silhouette, showing the outcome of the move.
Would it be possible to do the following at the end of a turn?

• Store the orientation, velocity and angular velocity of the rigidbody
• Make them kinematic
  then
• make them move again
• Restore the orientation, velocity and angular velocity

The intention is that the player will get X seconds to make their turn and confirm, and when the turn begins, the velocities and orientation will be restored so that the movements will still be as normal

[carmine basin]

never mind, i have sorted it :D

I did exactly that, and It works pretty well

[wind meadow]

not sure if it goes here but for coroutines. Is it possible for a coroutine function to have a waitforseconds and waituntil albeit separated by say an if/else block?

[unique cave]

that doesn't sound like it has anything to do with physics. ask on one of those scripting channels

[wind meadow]

yeah i was figured

[zealous phoenix]

Yeah, I realized that might have been the problem. Thanks for clarifying.

[remote dirge]

why.
The player has a bean collider and a Rigibody attached. The Rigibody is moved via modifying its velocity in FixedUpdate(). The collider has continuous collision detection.
The body decides to go to space when going over a step like shown in the gif.
why.
More information: the y changes exponentially after that. I'm assuming the velocity keeps being set to a higher number because the physics solver still thinks we are no that step?
Edit: forgot a question mark

also I don't know why doesn't the gif show the entire thing, but considering the FPS, it can't. Just imagine the blue dude is gone

[timid dove]

could be an issue in your code

but yeah the video doesn't show much

can you show the code?

[remote dirge]

  Vector3 movementVector = new Vector3(moveInput.x, rb.velocity.y, moveInput.y);
  rb.MovePosition(transform.position + movementVector);

[timid dove]

I thought you said you were moving via "modifying its velocity in FixedUpdate()"

[remote dirge]

yea I changed it rn and my brain didn't register it

[timid dove]

anyway this:
new Vector3(moveInput.x, rb.velocity.y, moveInput.y); is not generally correct.

[remote dirge]

but moveposition seems to work

[timid dove]

If this is in FixedUpdate I'd at very least expect:
new Vector3(moveInput.x, rb.velocity.y * Time.fixedDeltaTime, moveInput.y);

[remote dirge]

rb.velocity = movementVector * movementSpeed; this is the old way

[timid dove]

uhh yeah that'd do it too because that's multiplying the existing y velocity by whatever your movement speed is each frame

which will send you rocketing into the sky

since rb.velocity.y is a component of movementVector

[remote dirge]

that's extremely incorrect considering that the rb.velocity is being changed by Unity every physics call.

[timid dove]

Well you;'re using MovePosition which completely overwrites / ignores velocity anyway

so you're wrong about that

I wouldn't expect MovePosition to ever be used with rb.velocity anyway

[remote dirge]

the moveInput is corrected with Time.fixedDeltaTime already

[timid dove]

they - shouldn't really mix at all

[timid dove]

Ok but the y component is NOT

that's your problem

and why I suggested what I did

you only corrected the x and z

If you let the physics simulation do its thing - yes the velocity will automatically use fixedDeltaTime.
But you're not doing that - you're using MovePosition

[remote dirge]

the y component IS already being modified by unity
multiplying the Y component like that only makes it go way slower than it should

[remote dirge]

I sent the old way a couple messages ago

rb.velocity = movementVector * movementSpeed; this is how I used to do it

[timid dove]

yeah and again if movementVector includes rb.velocity.y already then it's a problem

say movementSpeed is 5 then you will be multiplying the y velocity by 5 every frame

hence - rocketship

[remote dirge]

fair point

true that

[timid dove]

I think you want this:

rb.velocity = new Vector3(moveInput.x, rb.velocity.y, moveInput.y);``` but you'd have to get rid of the previous deltaTime multiplication into moveInput here

[remote dirge]

it just makes the character fall insanely slow

[timid dove]

it won't affect y velocity at all

[remote dirge]

I'll just stick with move position for now

[timid dove]

sounds like you're later multiplying deltaTime in

basically you're just having issues with your order of operations etc right now

[remote dirge]

no I multiply the input

moveInput = new Vector3(Input.GetAxisRaw("Horizontal"), Input.GetAxisRaw("Vertical")) * movementSpeed * Time.fixedDeltaTime;

oh also I don't know why is there two movementspeeds

oh right I was debugging something

[timid dove]

If you do this:

moveInput = new Vector3(Input.GetAxisRaw("Horizontal"), Input.GetAxisRaw("Vertical")) * movementSpeed;
rb.velocity = new Vector3(moveInput.x, rb.velocity.y, moveInput.y);``` it should work properly

(deleting any other MovePosition lines etc...)

[remote dirge]

yup that works

I have no idea why I had that multiplication there bruh

thanks

[primal remnant]

Bit of a strange issue i'm having. I am I'm calling RaycastAll() toward the ground to check for colliders in a certain Layer. all works fine, except for the colliders that are parented under gameobjects with rigidbodies. they are never found. if i unparent the collider, it will find it just fine. if i delete the rigidbody, it will also start detecting it.

EDIT: seems to be like that on purpose. if i add a rigidbody to the child collider it will now function properly

[timid dove]

Note that RaycastHit has:
.collider .rigidbody and .transform and they all do subtly different things

Pay careful care about which you're using

[golden oriole]

The transparent object has the Physics material seen on the right side attatched to it. But for some reason, it doesn't recognize it at the start (as seen by me throwing something at it with no bounce happening). Only once I edit it, even if I return it to the original value of 0.5 afterwards, it starts working again. Anyone know why that could be?

Notably, it worked fine for the past 2+ weeks since i implemented it, just today It decided to stop working, but I can't figure out what I did to cause an interaction like this. (No physics material, nor their values are changed in code, nor does the transparent object have any type of script attatched)

[dusty trout]

How do you make a custom constraint?

[timid dove]

what kind of constraint are we talking about

[dusty trout]

For instance, a custom Parent constraint

Ones that don't require rigging

I found info on Google about a year ago and was able to make a two-handed constraint, but I can't find anything anymore...

[timid dove]

Unity has a Parent Constraint

that doesn't require rigging

not really a physics related thing though

Are we talking about like.. physics joints? Or what?

[dusty trout]

At the moment I want to make a locked joint with struts. (Unity's are to sporadic...)
But I would also like to know, in General, how to make custom constraints for Any future constraint I would like to make.
Really just looking for Any example of a custom constraint that I can use as an example...

[dusty trout]

Sorry, I didn't see your quick reply till now. I'll try to check back sooner...

[timid dove]

Hav eyou looked into Articulation Bodies and Articulation Joints?

[dusty trout]

Yes, I spent hours on it and came to the conclusion that this would not work either.
But even so, I would really like to know how to make Any Custom constraint.

Is it possible?

[timid dove]

If you're talking about custom joints, I don't think so

At least not within their framework of Joints. You can of course write a script that manipulates Rigidbodies however you please

[dusty trout]

It turns out that the custom two-handed constraint that I had made a year ago was an extension of the Animation Rigging package:
https://www.youtube.com/watch?v=xwwK0lAlSyY

[dusty trout]

Ok, thanks for you feedback

[quartz wyvern]

if an RB is kinematic can i update it via transform.position or do i have to use rb.position ?

for things like triggers to still work accurately

[last geode]

anybody know why the left model works and the right model doesn't?

[restive maple]

how do I get my character's arm to flop backwards while they run

like a physics based flop

[frigid spindle]

why does my ragdoll do that

[restive sinew]

I have been working on creating a Car Racing game, and despite watching several videos, I find this problem to be persistent: The car's wheels (driven by corresponding wheel collider game objects, fall through the surface of the ground object when the Play button is pressed..

[tacit laurel]

can one scene have multiple physics "worlds"? i need to timescale 0 the game while in the creature editor

looks like it's per scene

[fallow wyvern]

I just converted my player to Is Trigger and now it is sinking through the floor. I do need it enabled because I'm checking if it's colliding from another object

How can i get it to stop sinking through the floor

oh i see, is trigger stops the collision mechanic and just makes it an object you can pass through

[last geode]

if it helps im using this tutorial: https://www.youtube.com/watch?v=iiNt4Z_0lU8&t=6s&ab_channel=HappyChuckProgramming

[gleaming gorge]

Any idea on how to make a charactercontroller 'fat' but without making them able to climb obstacles?

[neat heart]

How do I go about having per-voxel collision detection with my obj files exported from MagicaVoxel?

[unique cave]

PhysX is not voxel physics engine. You can obviously add as many box colliders to the objects as you want to but it may not end up being as performant as you want, especially with large maps with lots of details

[timid dove]

Increase radius and decrease step height

[neat heart]

I got my player controller here, which is supposed to check when the player is standing on the ground/on a solid surface: https://paste.helpch.at/poyojasija.csharp

For some reason though, IsOnGround() always returns true no matter what

[timid dove]

you should check what object your raycast is hitting

[neat heart]

I'm not sure how i'd do that

Also, sidenote: OnDrawGizmos doesnt seem to be working, not sure if I am doing something wrong with that

hmm for some reason it's always null

Though the player definitely has an object under him

[timid dove]

Using hte raycast results of course. You'll have to switch to an override that includes a RaycastHit

[neat heart]

Idk what is wrong with my Unity though

[timid dove]

wdym

[neat heart]

Debug.DrawRay(raycastOrigin, transform.forward * stepCheckDistance, Color.red); is not showing anything, shouldnt that draw a ray

[timid dove]

do you have gizmos enabled?

[neat heart]

Ah

I'm not sure if I do

Ahhhh

Got it

[gleaming gorge]

I did, I have set the step height to 0 and it still can climb
this image may help describing the problem.
I think due to the collision normal having value > 0 in the left image, the character controller still have possibility to move up with enough force.
Sure I can make the obstacle higher but it feels like more of a hack and might cause random problem again in the future

[unique prism]

Can anyone help me figure out why my ball is losing velocity when it hits my paddle?

private void OnCollisionEnter2D(Collision2D collision)
    {
        Ball ball = collision.gameObject.GetComponent<Ball>();

        if (ball != null)
        {
            Vector3 paddlePosition = this.transform.position;
            Vector2 contactPoint = collision.GetContact(0).point;

            float offset = paddlePosition.x - contactPoint.x;
            float width = collision.otherCollider.bounds.size.x / 2;

            float currentAngle = Vector2.SignedAngle(Vector2.up, ball.rigidbody.velocity);
            float bounceAngle = (offset / width) * this.maxBounceAngle;
            float newAngle = Mathf.Clamp(bounceAngle, -this.maxBounceAngle, this.maxBounceAngle);

            Quaternion rotation = Quaternion.AngleAxis(newAngle, Vector3.forward);
            ball.rigidbody.velocity = rotation * Vector2.up * ball.rigidbody.velocity.magnitude;

        }
    }

this is what gets called when it collides

[gleaming gorge]

ball.rigidbody.velocity = rotation * Vector2.up * ball.rigidbody.velocity.magnitude;
When you multiply something with vector2.up, it will lose the horizontal speed since vector2.up.x == 0, so try to remove the vector2.up

[unique prism]

It needs to be a vector though since it's a quaternion, and multiplying by (0,1) just makes it travel up. I thought multiplying it by the magnitude would account for the horizontal velocity?

Since the magnitude is the speed its traveling in any direction

Could you show me what you had in mind?

[timid dove]

It's losing energy because that's what happens when things collide in the physics simulation

if you want to keep a constant velocity - do that

ball.rigidbody.velocity = rotation * Vector2.up * ballSpeed;

[gleaming gorge]

Ah right, I always mixed up between vector3.forward and vector2.up 😅
Maybe you should try to log if your ball.rigidbody.velocity after collision is the same as ball.rigidbody.velocity before collision
Btw is that rigidbody is Rigidbody2D?

[unique prism]

Yes it's 2D

[unique prism]

is ballSpeed an actual thing I can call? I thought I was already doing this by multiplying by ball.rigidbody.velocity.magnitude

[timid dove]

It is if you make such a variable

it was an example

I thought I was already doing this by multiplying by ball.rigidbody.velocity.magnitude
As mentioned already, the ball is going to lose energy from the impact.

Using the ball's existing velocity doesn't help you at all since that magnitude is going to decrease naturally from the collision

[unique prism]

Ah alright

thank you!

[tawdry heath]

do collider-related questions go here?

[tawdry heath]

I have this Table with a Drawer, and inside the drawer I have a flashlight. How can I make the flashlight move with the drawer moving?

[wide nebula]

Making it a child of the drawer would be the easiest.

[lost radish]

Im trying to make a rope by connecting joints together however I cant get it to not be squiggly! Any idea what may cause this?

[lost radish]

For some reason reassigning connectedBody every fixedupdate fixed the issue

    private void FixedUpdate()
    {
        Rigidbody cRb;
        for (int i = allHingeJoints.Count - 1; i >= 0; i -= 1)
        {
            cRb = allHingeJoints[i].connectedBody;
            allHingeJoints[i].connectedBody = null;
            allHingeJoints[i].connectedBody = cRb;
        }
    }```

[umbral flare]

Is anyone else having issues with unity editors crashing when entering play mode with a ragdoll in the scene?

[neat heart]

I've got this method here to handle the player movement: https://paste.helpch.at/obibojuzej.java

For some reason though, while everything works fine, the game does not seem to detect when the player is jumping. I tried using GetKeyDown(Space) instead but that did not work either.

[fresh patrol]

Hello, how can i prevent two sprites with rb2d's and collider 2d's from going through eachother? Some of the cubes in the picture fall right through into cube below them sometimes. Reducing the y gravity in the project settings is not an option for me and it causes another problem. Any idea how can i fix this issue?

[timid dove]

best to share the whole script because it's unclear for example where this code is called from.

anyway - you already have logs - so use them and figure out which code is and isn't running

that will help you track down the issue

[unique cave]

Id definitely not rely on physics on that type grid based game. Increasing physics iterations and making fixed timestep smaller would probably help on that but as I said, using physics doesnt sound ideal solution

[fresh patrol]

You're right physics is too unstable to handle some functions which requires precision. However i'll try to fix the issue by tweaking the physics settings for now bcs i feel like trying to move the tiles with code will take a lot of time and i might get stuck somewhere considering my skill level on coding

[fresh patrol]

by physics iterations you mean position iterations? It's on 1000 right now. These are my physics 2d settings currently:

[unique cave]

I assumed that would help, yeah. 1000 is quite high number already😅. Fixed Timestep on Time settings is something that would help more but will obviously be quite expensive

[fresh patrol]

Fixed Timestep is set on default(0.02) To what value should i set it to, like 0.01?

[unique cave]

Id try 0.01

[fresh patrol]

it didn't do it. I did this by watching a tutorial. It works almost perfect in the tutorial. I think it's possible but it requires a lot of tweaking and i need to find a sweet spot in the settings

[fresh patrol]

i reduced gravity to -10, some cubes still go into eachother, so i think gravity is not the source of the problem here

[clear pewter]

Hi guys,i am creating a game for VR,i am having an huge problem with the colliders,in my game i have a controller that has to hit a disk and during the hitting it is like the controller "enter" inside the disk and it is not good at all.

Is there a way to solve this problem?

[velvet fog]

how accurate is Unity physics to real world? are there any tests/comparisons?

[hollow echo]

It's PhysX, and the answer is: it's extremely approximate

[timid dove]

Not that accurate. It's a simulation designed for computational efficiency and decent results

[velvet fog]

what do you mean its physx?

[hollow echo]

🗃️ Documentation

Physics manual
Unity Physics (ECS) • Havok Physics (ECS)

📚 Resources

Collision action matrix

Github examples

• Physics 2D examples

Youtube

• Overview of Havok Physics

🤔 Troubleshooting

• Debugging physics messages

[velvet fog]

oh really? default unity physics engine is just physx? didn't know about it. thanks

does it mean than Unity will run better with nvidia gpu? or is physics simulation entirely upon cpu?

[timid dove]

The physics engine runs on the cpu

[novel furnace]

Does anyone know if it's possible for the Twist Limit Spring on a character joint to only make the high twist limit springy? I never want to go below the low twist limit, but I do want the high limit to be slightly flexible and springy

[strong leaf]

hello, why this doesn't work? C# isGrounded = Physics.BoxCast(m_groundOffset, m_boxCastSize / 2, -jumpAxis, layerMask: m_groundLayer);

Error CS1501 No overload for method 'BoxCast' takes 4 argument; but boxcast has one declaration like this: public static bool BoxCast(Vector3 center, Vector3 halfExtents, Vector3 direction, Quaternion orientation = Quaternion.identity, float maxDistance = Mathf.Infinity, int layerMask = DefaultRaycastLayers, QueryTriggerInteraction queryTriggerInteraction = QueryTriggerInteraction.UseGlobal);

so it should work by specifying the named parameter, right? I'm confused what is going on

[timid dove]

Check the docs and make sure you're using a version of the function that actually exists:
https://docs.unity3d.com/ScriptReference/Physics.BoxCast.html

Are m_groundOffset and jumpAxis both Vector3s?

[strong leaf]

yes

if I specify the default for these it works: isGrounded = Physics.BoxCast(m_groundOffset, m_boxCastSize / 2, -jumpAxis, Quaternion.identity, Mathf.Infinity, m_groundLayer,QueryTriggerInteraction.UseGlobal);

weird

[timid dove]

which version of unity are you on?

[strong leaf]

2022.2

[timid dove]

Oh wait I know the problem - Unity doesn't use C# default arguments the normal way sometimes. Because they want to inject non-constant values they use this cute attribute technique:
https://github.com/Unity-Technologies/UnityCsReference/blob/4b436cf82aaff7a0719e373ee8af4f4625f05638/Modules/Physics/ScriptBindings/Dynamics.bindings.cs#L924

The result is what you tried to do with named parameters won't work

[strong leaf]

oooow, damn, thanks for the explanation! had no idea about this

[unique snow]

I am programing a 3D game and there is the player and the box, but if they collide and the player walks the player pushes the box like its nothing. I tried to increase the mass of the box didnt work. Pin me if u can help!

[strong leaf]

are you using forces or velocities?

[unique snow]

Velo

[strong leaf]

if you are changing the player's speed by velocity it won't take mass and any physics interaction in consideration, only collisions

[unique snow]

Hmm

[strong leaf]

https://forum.unity.com/threads/rigidbody-velocity-or-moveposition-or-addforce.810846/ "I wouldn't modify velocity directly. Doing that simply overrides the velocity calculation that comes from the physics solver, which may cause side effects."

if you want to keep using velocities you should do raycasts and basically simulate those interactions yourself or keep using forces

[timid dove]

you would have to be moving your player via forces

If you just say "set my velocity to 5" it will do so, without regard to the physics of the situation

[strong leaf]

is there any alternative to Physics.OverlapBox() that doesn't return the colliders hit? I'm interested in a boxcast behaviour, but to be able to detect when collider intersects at start

[timid dove]

CheckBox

note that neither of those give you a "cast", they're just queries on a specific box-shaped space in the scene.

[strong leaf]

yep, it's what I meant by that, and exactly what I need, thank you!

[strong leaf]

I am trying to make an object follow relative world position of the cursor: ```
transform.position = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Vector3.Distance(transform.position, Camera.main.transform.position)));

the problem is every tick the object gets further and further away and I don't understand why; both the cursor and the camera remain the same position

[strong leaf]

nvm, I fixed this, I should have cached the initial position of the object

[tawny birch]

dunno if this belongs in here but it fits the best. Does someone know if theres a way to rotate a box collider?

[timid dove]

rotate the object it is attached to.

[strong leaf]

    protected override void Start()
    {
        base.Start();
        m_currLane = m_startLane;
        if (m_discreteLanes != null)
        {
            Debug.Log(m_discreteLanes.LanePositions[m_currLane - 1]);
            transform.position = m_discreteLanes.LanePositions[m_currLane - 1];
            Debug.Log(transform.position);
        }
    }```

I have this code and the player should be positioned in the lane transform position, but the position stays the same

the debug log prints the new position, so somewhere in the way something changes it's position to the one set in the inspector

any was how to debug this? fixedupdate and update are empty

[timid dove]

Does your object have a CharacterController and/or Animator?

[strong leaf]

animator yes, but root motion is off

[timid dove]

(p.s. why - 1?

[timid dove]

That's exactly the problem then

disable the animator to test

[strong leaf]

disabled it, no effect

[strong leaf]

I use 1-n indexing in inspector

[strong leaf]

I still couln't solve this, really weird

nvm, damn that was tricky; I was modifying the transforms position instead of rigidbody

how can I position a rigidbody that is not kinematic by modifying the transform?

[timid dove]

You generally shouldn't

Maybe use MovePosition in FixedUpdate?

[quartz wyvern]

any one know a easy way to keep 3D physics objects with rigidbodies to remain inside the unity' navmesh surface

i need objects to avoid accidently getting in to an area the player cannot reach to pick them up

[fresh moon]

This seems to be for vr right ? you can respawn them at the initial location if they are out of reach.

[quartz wyvern]

No

Player can throw objects but the items need to be reachable to pickup by the navmesh agent @fresh moon

So can't have them end up outside the player nav area

[fresh moon]

Are there many such objects ?

[quartz wyvern]

Like 100 or so

[fresh moon]

you have two options, First : you need to have some script running in each object that detects that itself is not on the navmesh. Second : you need to have some outside script that knows the boundary and keep track of objects.
easy one to implement would be the First one but It will be computationally heavy

[rich totem]

hello, i am amking a gokart game. I want to ask about suspension. on which things i should focus on. I am kinda new to wheel colliders and stuff. Right now i have a functioning gocard but its a little jiggely

[twin nebula]

Just realised there's a physics channel so I'll ask here instead because I am not learning Newton's second law of motion just for this

How would I calculate what torque is needed for something to reach a position? Or how could I just generally make a ball roll to reach another target?

[timid dove]

That question doesn't specify enough information.

any torque will be enough to reach a desired rotation.

The question is how fast do you want to reach it and over what time period will you be applying the torque. Also do you want it to stop spinning at the end because that'd be another torque.

[twin nebula]

I want to reach a position rather than a rotation. I want the ball to roll to a GameObject

I don't know how to calculate the torque to get it to roll in the direction of an object

[timid dove]

I mean, similar answer

Any torque will get you rolling

And any rolling speed will get you anywhere - barring friction

It just depends how fast you want to get there

[twin nebula]

No but like what is the math behind it

Like targetPosition - currentPosition doesn't work

[timid dove]

As I've been saying you haven't fully specified the question yet. There's no math until you rigorously describe exactly what it is you want.

[twin nebula]

I don't get what I'm meant to describe. I want to make a ball roll to a position using AddTorque

(That's not being passive aggressive by the way)

[sleek grail]

I used wheel colliders for my car, and for some reason when I press play it turns into a crab. What did I do wrong?

[timid dove]

your model is sideways

export/import it properly so that the z axis (blue arrow) is forward

[sleek grail]

yeah that was the issue thankfully, didnt realise export rotation mattered lol

[ancient kite]

Hi, this is my own first project, I added colliders both sides of the way to prevent the cube (player) to fall off, but when I jump and stick to either "wall" mid-air, it slides off, vibrate for a moment on the corner and onGround remains false even it touch the ground, hence it doesn't jump again

[coral mango]

So I know you can enable kinematic/kinematic contacts, but is there a way to enable collisions between a kinematic rigidbody and a charactercontroller?

[timid dove]

Hard to help without seeing any code or what components are on the object(s)

[ancient kite]

nothing fancy, just a rigidbody and a collider

I changed transform by keys to AddForce for moving left and right but as you see, when I keep pressing the A-D button, it sticks to collider instead of sliding down

[timid dove]

Yep pretty standard

It's just due to friction with the wall

In real life if you push an object against a wall it also won't slide down due to friction

Same deal here

[ancient kite]

I thought rigidbody handles that, it has a friction properity of 0.0

[timid dove]

By default it has non zero friction

Unless you applied a custom physics material

[ancient kite]

cube has rigidbody, collider "walls" don't btw

[ancient kite]

oh, thank you, it works just fine now

[toxic coral]

I have a ragdoll and when an object hit the ragdoll I'd like to apply the objects force (velocity) to the ragdoll so it will fly in the proper direction. Currently I am applying the force to all rigidbodies of the ragdoll but it does not seem to affect anything.

Here is my logic:

    public void ActivateRagdoll(Vector3 velocity)
    {
        _animator.enabled = false;
        _colliders.ForEach(col => { col.enabled = true; });
        _rigidBodies.ForEach(rb => { rb.isKinematic = false; });
        _rigidBodies.ForEach(rb => rb.AddForce(velocity));
    }

The ragdoll just falls without any directional force.

[silver moss]

Use ForceMode.Impulse when you use AddForce with one time forces

Or ForceMode.VelocityChange

Or just change the rb.velocity directly

[remote dirge]

is it possible to "rerun" the OnCollisionStay() void?
because it doesn't return all the Collisions (I'm just putting it out here, I hate that design), there are some cases where the game won't register the player as grounded (specifically where there are more Collisions happening, with a wall, another object or literally anything else)

private void OnCollisionStay(Collision collision)
    {
        ContactPoint[] contacts = new ContactPoint[collision.contactCount];   
        int contactCount = collision.GetContacts(contacts);
        for (int i = 0; i < contactCount; i++)
        {
            Vector3 contactNormal = contacts[i].normal;
            if (contactNormal.y < 0.05f && contactNormal.y > -0.05f) //the vector is not pointing up or down
            {
                if (contactNormal.sqrMagnitude > 0.0f) //but it is pointing somewhere else
                {
                    "RerunTheFunction"
                }
            }
            if (contactNormal.y > 0.1f)
                isGrounded = true   */
        }
    }
//sort of minimal code

or is there a way to get multiple Collisions?

[toxic coral]

hm thanks for the hint but none of them worked 😦 ragdoll still falls the same

[silver moss]

No matter how high of a velocity value you use?

[toxic coral]

No sorry the problem is that the direction is always the same. The character always is "punched" backwards. Even tho I attack from the sides etc.

[toxic coral]

Ok one important info might be what velocity I retrieve to add. I use the velocity of the object that is hitting the character by accessing rigidbody.velocity. I then apply that velocity as force to the rigidbodies of the ragdoll of the target. I assume that this is not the way to do it?

[silver moss]

Okay so the forces work but the direction is not what you want

[silver moss]

Are you using OnCollisionEnter? Show the code where you call ActivateRagdoll from

You could use collision.relativeVelocity

The thing is that when OnCollisionEnter is called, the collision has already happened and rigidbody.velocity has already been changed by the physics response

[toxic coral]

        public void OnCollisionEnter(Collision other)
        {
            OnHit(other.collider.gameObject, other.relativeVelocity);
        }


        protected override void OnHit(GameObject hitObject, Vector3 collisionVelocity)
        {
            var ragdoll = hitObject.GetComponentInParent<NPCRagdollManager>();
            if (ragdoll == null) return;
            ragdoll.ActivateRagdoll(collisionVelocity);
        }

    public void ActivateRagdoll()
    {
        _animator.enabled = false;
        _colliders.ForEach(col => { col.enabled = true; });
        _rigidBodies.ForEach(rb => { rb.isKinematic = false; });
    }


    public void ActivateRagdoll(Vector3 velocity)
    {
        ActivateRagdoll();
        _rigidBodies.ForEach(rb => rb.AddForce(velocity, ForceMode.Impulse));
    }

These methods are from three different classes but I pasted them into this snipped for reading convienience

[silver moss]

Everything I see here looks OK 🤔

You could try waiting one frame with a coroutine and then adding the forces

[toxic coral]

yeah I kinda assumed that - maybe it's not ready to add forces to the rigidbodies at that point

[toxic coral]

How can I wait for exactly one frame again? I stumbled over that once

[silver moss]

In this case you probably want to wait for fixed update:
https://docs.unity3d.com/ScriptReference/WaitForFixedUpdate.html

Maybe twice? Not sure

yield return null; would let you wait one frame but I don't think it helps here, but try everything

[toxic coral]

maybe I just check some tutorial on those things. Can't be the first person who wants to do that eh

[silver moss]

Have you used coroutines before?

[toxic coral]

yes

[silver moss]

IEnumerator WaitAndAddForces()
{
  yield return new WaitForFixedUpdate();
  // Add forces here
}```

yield return null; might also work if it is the animator that takes one frame to deactivate

[toxic coral]

no did not help. thanks for the help anyway. will go to sleep now and tomorrow dig into it more 😄

[remote dirge]

don't wanna be annoying, but anyone have any ideas? I didn't find a single good search online

[drowsy drift]

Anyone know how i might get a sheetmetal effect in unity? and what i mean by that is having the object bending and deforming, but not too bendy.

Want to have it that you can push a mesh like this against a wall and it bends and conforms as it is pushed against the wall.

[toxic coral]

Can someone explain to me why the ragdoll is not pushed to the right side by the force of the box that hit it? Yesterday I tried to figure it out but I am still clueless.

[remote dirge]

you'll need something like a cloth solver
and just tweak the parameters so it behaves like a metal sheet

[cerulean kestrel]

Are mesh colliders known for being sometimes inconsistent with some custom meshes in terms of collision detection when using OnCollisionEnter() alongside a Tag to detect if a moving object has hit the mesh collider?

Context: I have made a simple cube-shaped pillar with ramps around it in Blender, but when I import it as .fbx (and set the Generate Colliders boolean to true in the import settings), the boundaries of the pillar's mesh collider are not visible (even though they are supposed to), and the moving objects that are supposed to destroy themselves when hitting the pillar go through the pillar in specifics parts of the model...

I know this could be more of a Blender/3D modelling issue, but I still wanted to ask here just in case.

[dire peak]

Does anyone have any experience using a sprites custom physics shape to make mesh colliders in Unity3D? I am trying to make hit/hurtboxes but since it's 2D sprites in 3D I am struggling.

[neat heart]

https://paste.helpch.at/neyocomexe.csharp

In my custom character controller, for some reason my player when moving towards a 1 voxel high step, they might 'teleport' above it or 'jump' on it automatically.
I have no idea what part of my code causes that.
Also, sometimes, when running towards objects made of several voxels which strange shapes, the player clips through the object.

Like huh

[timid dove]

1. Unity won't render the collider gizmos for concave colliders for whatever reason
2. It is entirely possible for your mesh to have degenerate topology which can lead to unexpected collision behavior.

If you object has a complicated shape, if possible try to use a simpler mesh or several primitive colliders for the collider.

[timid dove]

customphysics shape only works with TIlemap collider2d and polygoncollider2d

it will not do anything with 3D physics

[dire peak]

Thank you for responding. Do you happen to know if it's possible to access the vertices of a custom physics shape using a C# script? In my research I mostly saw that you're right and custom physics shape is meant for 2D colliders but I thought since my game is light on resources I might be able to just generate a mesh and a MeshCollider3D each frame based on the locations of the custom physics shape vertices.

[cerulean kestrel]

alright then, i suppose i have to recreate the staircase pillar i made and try my best to hopefully make it have better topology...

thanks for the info though, i appreciate it!

[timid dove]

https://docs.unity3d.com/ScriptReference/Sprite.GetPhysicsShape.html

[dire peak]

thanks a lot ❤️

[remote dirge]

is it possible to "rerun" the OnCollisionStay() void?
because it doesn't return all the Collisions (I'm just putting it out here, I hate that design), there are some cases where the game won't register the player as grounded (specifically where there are more Collisions happening, with a wall, another object or literally anything else)

private void OnCollisionStay(Collision collision)
    {
        ContactPoint[] contacts = new ContactPoint[collision.contactCount];   
        int contactCount = collision.GetContacts(contacts);
        for (int i = 0; i < contactCount; i++)
        {
            Vector3 contactNormal = contacts[i].normal;
            if (contactNormal.y < 0.05f && contactNormal.y > -0.05f) //the vector is not pointing up or down
            {
                if (contactNormal.sqrMagnitude > 0.0f) //but it is pointing somewhere else
                {
                    "RerunTheFunction"
                }
            }
            if (contactNormal.y > 0.1f)
                isGrounded = true   */
        }
    }
//sort of minimal code

or is there a way to get multiple Collisions?

[neat heart]

Bump, still got no clue what is going on

[neat heart]

Here's a video of what happens

Like huh why does it go up steps like this? I don't have any code that should make this happen

[viral beacon]

do rigidbodies always perform better outside of a transform heirarchy?

[timid dove]

I don't understand what "rerunning" the function would do to help you hear, or why you're using OnCollisionStay in the first place

or what you mean by it "returning" collisions (it doesn't return anything)

If you want to track all of the current ground colliders your player is touching you should use a collection such as a HashSet or a List

e.g.

HashSet<Collider> currentlyTouchingGround = new();

void OnCollisionEnter(Collision c) {
  bool isGround = // all your code to detect if this is a ground collider.

  if (isGround) {
    currentlyTouchingGround.Add(c.collider);
  }

  isGrounded = currentlyTouching.Count > 0;
}

void OnCollisionExit(Collision c) {
  currentlyTouchingGround.Remove(c.collider);
  isGrounded = currentlyTouchingGround.Count > 0;
}```
@remote dirge

[neat heart]

Bump...

[remote dirge]

yea I didn't think about it like that, I don't need OCStay :/

thanks!

[viral beacon]

I have a system where I use empties to group rigidbody systems, is it fine for the transform of these empties to not follow the rigidbodies?

[timid dove]

you'll have to elaborate more on what you mean

[viral beacon]

As it currently stands, I have one object that serves as the parent for multiple rigidbodies, my intent is to not place rigidbodies in a transform heirarchy, so that puts me in a position where these group objects wont follow their children. I would like to know if thats alright or if theres a better alternative.

[timid dove]

I don't really get what you mean by "so that puts me in a position where these group objects wont follow their children"

Objects never follow their children.

The special thing with Rigidbodies is that if they're dynamic, they won't follow their parents

[wraith junco]

Suppose I'm trying to land a rigidbody helicopter on a rigidbody cargo ship. What's the best way of getting the helicopter to stay in sync with the boat?

Joints aren't really good because I need the helicopter to still have it's own freedom of movement.

I was thinking just directly modifying the velocity of the helicopter to make up for the position error every simulation tick, but now we're overriding the helicopter's actual physics movement

[timid dove]

PID controller

[wraith junco]

PIDs relate to control theory right? I feel like that would get pretty complex if we're adding force to mitigate the error.

What about just directly modifying the child's position/rotation based on the movement delta from the parent?

just brainstorming for now.

[wraith junco]

just to clarify: I'm looking to create a parenting effect between two rigidbodies. Not an AI helicopter.

[bleak umbra]

You could have joints that you break based on some logic or disable the force sim based on some logic

[timid dove]

You expressed concern about overriding the physics movement. a PID controller is the right way to do this if you want to use real physics
It's not quite an AI helicopter.

As an analogy, this would be basic dumb cruise control, not a self driving car.

[uncut pollen]

Hi, quick question about making a ragdoll with rigidbodies and configurable joints
I have 2 objects with capsule colliders + rigidbodies I want to connect with a configurable joint, but I'm not sure how to set the point of connection to be the location of another object
I want to connect the top and bottom capsule at the sphere. The sphere doesn't have a rigidbody component. How would I go about setting the point of connection to the sphere?

[timid dove]

you wouldn't. The sphere would basically just be a visual thing.

You'd just connect to the other body at the sphere's local position in that body's coordinate space

(the joint's connected anchor)

[uncut pollen]

Yea thought so but it's a vector3 so I guess I have to make a script for it

Thanks

[mint portal]

In my 2d game, I want to simulate a bullet hitting multiple targets in a row (basically going through them). I've tried taking the targets' Vector2 positions and calculating the angles from the attacker. I then checked Mathf.Abs(Mathf.DeltaAngle(angle1, angle2)) to see if it's small enough to indicate that they are roughly aligned from the attacker's perspective.
This method isn't working, probably because I don't understand how Vector2.Angle or Vector2.SignedAngle calculates it's value.
Is there an easier/better way of doing this?

I found a solution using atan2.

[bleak umbra]

Yes, raycasting

[uncut pollen]

How come there's only a low/high angular X limit for configurable joints but only 1 setting for Y and Z

strange

[narrow osprey]

Hey folks,

TL:DR - "rb.velocity = moveVec" type movement is bad at handling external forces, is there a reliable solution?

I've been using Addforce movement for my characters for a long time. It's very flexible for applying external forces, but terrible for moving platforms. So I'm switching over to a more traditional "rb.velocity = moveVector" type of approach, which solves the moving platforms problem, but is bad with handling external forces (eg explosions, wind-streams, etc) because anytime I set rb.velocity on the character, it cancels out any momentum that those external forces provided.
To give a concrete example, if I walk into a wind-trigger the wind can push me, but as soon as I'm out of the trigger that force from the wind stops instantly (whereas when a character uses Addforce type movement this isn't a problem because the moveVec and external forces all just accumulate

Is there a common solution to this?
(ps my problem is with X/Z external forces, as Y axis isn't a problem)

[bleak umbra]

If you do kinematic movement (write to velocity) you should for the most part disable all forces acting on your character via layers or go full kinematic by turning the rigidbody to kinematic and make your own collision handler or use KCC (asset).

[timid dove]

If you want realistic responses to external forces and also for your thing to attempt to reach some target velocity, your best bet is a PID controller.

[supple vault]

Any way to fix this???
I made locomotion similar to Gorilla Tag and uses Configurable Joints
turning the mass on the physics hands down doesn't do any good bc it makes the hands/arms weak
if ur wondering what i need help with its the hand moving the entire body when moved fast or in general

[late sundial]

does anyone by chance has ever worked with Obi softbody?

We are stumped on how to generate a good blueprint

[fickle cobalt]

is my wheel collider supposed to have a long orange line? because when I run the game, my bus is behaving very weirdly

don't worry about the pink car beside it its just for testing*

nevermind I'm dumb I forgot that was the suspension distance

[narrow osprey]

Thanks for your response! No I do want the forces to act on the character, that's the problem. With AddForce this works really nicely, but then moving platforms are ruined or inaccurate

[narrow osprey]

Oh great, I've never heard of a PID controller. That sounds ideal - thanks!

[peak charm]

hello! i want to understand why i'm still able to run into walls and other vertical surfaces. i'm watching a tutorial and to fix this specific bug they added a platform effector 2d and linked it to the composite collider. i did that, but i'm still able to run into verts. how do i fix this?

[neat heart]

https://paste.helpch.at/belaponecu.csharp

For some reason, when my player is underground like that, it wont move forward but itll only move diagonally.

https://paste.helpch.at/poqejidovu.csharp This is the CalculateInputDirection() method I use in that script above

[tough pasture]

Does anyone know how to make a better water physics... I basically used Shader for this... But it couldn't really look great..

[unique cave]

I dont understand. What you use shader for? What looks bad?

[tough pasture]

I mean the water??

I made use of a particular shader to give the water feeling. I am asking if there's any water simulation that is better than this..

[timid dove]

Are you asking about rendering or something else

if it's a rendering question #archived-shaders is the better place to ask

[tough pasture]

Maybe I should just ask this way:

Has any one worked with water before?? Did it require physic??

[timid dove]

"worked with water" is extremely vague

you have to explain what you're trying to do

[unique cave]

Making the visuals doesnt require any physics (only shader), but when you start making floating objects like boats, you may want to add rigidbody to the boat and add custom forces based on the water height (easiest to calculate by doing the same math you do in vertex shader but in c# side) at different positions of the boat

[queen nebula]

So thats probably very basic to most of you. I have a capsule and simple terrain i sculpt. When i move the capsule fast enough it will fly off the terrain, like a car flying of a ramp. How do i stop that ? Making the capsule move on the terrain without flying off ?

[timid dove]

what do you want to happen if it's going fast and goes over a ramp

[queen nebula]

Ok so basically i have a character as a child to the capsule

And now the character flys off. I want it to simply stick to ground.

I guess i could ray cast and just set its position

@timid dove But i hoped theres something else

[timid dove]

you're wanting to override the natural consequences of the physics engine so yes you'll need to write some code to do that

[queen nebula]

Does other games do that too?

When they have to move over terrain

[timid dove]

There are hundreds of thousands or millions of games

they all do different things

I'm sure some of them do that, yes.

[celest dagger]

Hey all, I am finding that I can push physics/rigidbodies through the floor like this: https://gyazo.com/be3d8d7b3ac7ddc730015d32cdfb4bf2

I cant find a direct reason why, I have solving iterations up and friction up. Does anyone know what causes this?

[wide nebula]

Are you using physics to push the objects, or assigning the position directly?

[celest dagger]

So it seems to work in Vr, I have a script driving the sphere(temporary hand) via velocity to the motion controlled. As long as kinematics is off it works well

[rain tartan]

this happens when i press the restart button i made someone help me and this is my box collider

[obtuse ruin]

Did you check your road collision yet?

You know what to look for considering you fixed your bike collision already in #💻┃code-beginner

[rain tartan]

this is my road collision

i cant see what could be the problem

[obtuse ruin]

Did you save your changes to the bike collision?

[rain tartan]

yh

[inland jetty]

Im attempting to launch my active ragdoll by hitting it with a fast moving wall. The wall has a rigidbody and gets near speed=100. The player mostly is just standing still. Sometimes my character gets caught in the wall and bugs out very very badly. So i set the rigidbody collision detection to continuous dynamic which seems to work but i just had a rare case where the wall skipped over the player.
Is this what interpolate is for, or am i supposed to use continuous speculative?
This bug hasnt happened many times, so its hard for me to test which solution works. Im getting mixed answers from google

[rain tartan]

wdym by save the changes

[obtuse ruin]

Well I see the exact same problem still so I can only assume the changes you made to the bike did not change

Like, it still clips the same amount

Otherwise I'm not sure

[peak charm]

bump

[rustic raptor]

Has anyone got some good resources or can anyone help me understand with unity's configurable joint system? I'm trying to use them to create a physics body for a XR game. I've been following a couple of tutorials on YouTube but I can never get the same result and I honestly don't understand what configurable joints do and the official documents isn't much help

[rain tartan]

anyone know why bike spawns like then when the restart button is pressed in the game over screen?

[timid dove]

nobody knows anything about your game so no

presumably that is how you set your scene up or how your code is placing the bike

[fading wyvern]

just replying to say that i randomly bumped into your answers from 2020 on the unity forums
ty for being giggity goated for the community

[fading wyvern]

ello
so
uh
I have two rigidbodies attached to each other with a fixedjoint2D

and one of them is supposed to move

one of them is supposed to spin

body 1 does move both itself and the other, but body 2 doesn't spin

is there anyway to freeze two objects against a joint but still allow them to rotate around said joint?

[harsh otter]

hi so i added wheel colliders to a car i have an when i press play it bounces really high. i fixed it by putting the mass of the car up and lowering the damper of the wheel colliders but not the car is obviously really slow and doesnt even move unless i set the speed to something like 10000000 and then it just flys off how do i fix this

[raven leaf]

i got a wheel collider that falls through the floor but other ones are perfectly fine, why is that ?

all wheel colliders in the cars maintain the position except for one it falls through the floor

it causes weird behaviors

and the collider is gone spining forever

SOLVED by redoing the same steps and same values...

[lone quartz]

Is there any way to stop "exploding" rigidbodys if they spawn at the same place?

[timid dove]

disable collisions between them somehow (trigger colliders, layer based collisions, Physics.IgnoreCollision, etc)

[untold python]

How can i make 2 way platform in 2D?
This is attached to tile's child gameobject

[timid dove]

what is a "2 way platform"?

Wouldn't that just be a normal object without the platform effector?

[untold python]

so if player is on the platform he must press down arrow so platform collider turns off

same thing when player is under the platform

[brittle stump]

Can someone help me with IK foot placement?

[tight salmon]

hey i wanted to ask a really broad question! does anyone here have experience with the unity havok integration? if so how did you find it? was it a big boon from the default physx backend?

[bleak umbra]

afaik the reason why "nobody" uses havok is because of the expensive license and therefore there is little real experience from which you could get any info here. you can always compare paper specs and see if that makes a difference for you or make your own tests, which would be the only thing you should base a decision on ('cause: havok is expensive).

[tight salmon]

@bleak umbra fair enough and thanks, that's an answer in and of itself 😄

[stuck bay]

Anybody know why my fixed timestep goes back to .02 in play mode no matter what I change it to? With everything in my scene deactivated still does it.

[hard iris]

Hi, got some problem with the tilemap collider 2D.
used a tilemap to make the floor for a 2.5D game i've started to make.
-Grid's Cell swizzle is set to XZY.

is there a way to rotate the tilemap collider to fit the existing tiles?

[spring current]

FOR THE PROS ---> What's the best way to get a nice looking collider on 2d art that has weird shapes/angles

[timid dove]

in the sprite editor you can set up a custom physics shape for any sprite

[spring current]

And then turn that shape into a collider or add a collider and it has the set up shape?

[spring current]

Thank you , I'll read more on this in google search. I appreciate your help

[timid dove]

it will be used if you use that sprite with a PolygonCollider2D or TilemapCollider2D

you can of course also always set up custom collider directly with the PolygonCollider2D

[spring current]

That sounds awesome and easy

[arctic hearth]

I know it's visual scripting but I think this is the colliders and not the scripts

[acoustic pond]

hey, i have beginner to mediocre experience with unity 2d, and i'm just not too sure on how to create a soft body that is an ACTUAL soft body player. the character i was thinking of was sort of like a slime blob thing, but i'm not sure how to give it the physics so that if like half of it was off an edge, it would be drooping off the edge and probably fall off due to gravity and so on so forth.

i have no idea how to go about this and would really appreciate help, straight from scratch

the best term to explain the type of soft body or something that im going for is almost fluid-like, if that helps you visualize it

[bleak umbra]

Something like this? Mostly a particle/point-cloud based simulation of a soft volume (probably held together by some sort of swarm algorithm) and an efficient algorithm for generating/updating a surface for that pint cloud. Neither of those problems are easy/efficient in the generic case you’ll find in published literature and would require a bunch of your own creativity. https://twitter.com/Vuthric/status/1500651043193069573?s=20

Asher Zhu (@Vuthric)

update on my Slime game💚

You call it exploring a dungeon. I call it food delivery.

#UE5 #gamedev #techart #vfx #realtimevfx

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Twitter · Mar 7, 2022, 1:54 AM

[acoustic pond]

exactly like that, but in 2d. i have absolutely zero idea what you just said meaning this is 100% NOT beginner friendly, but maybe it is in 2d?

is there a simpler method or another way in which I could accomplish the same thing in 2d

[bleak umbra]

In 2d it would be easier but still fundamentally the same thing. Maybe you can use trickery I’m not aware of in 2d. My first approach would still be a swarm sim and point cloud meshing algorithm. Maybe read a bit into fluid simulation, crowd/swarm algorithms and point cloud surfaces

[dusky marsh]

Hey folks, what could be the reason behind a Collider Trigger not triggering Enter nor Exit, but triggers stay ?

(even though it stops triggering stay when no longer in radius)

[inland frigate]

need help with physics

[sleek creek]

Anyone have any issues on Instantiated Objects not following the Physics Matrix by layer?

My object when dropped in the scene manually follows the physics matrix fine but when spawned through Instantiate(object) it just straight up collides with every layer and ignores the rules, even though the layer itself does not change.

[timid dove]

Nope there's no issue with this in general. There must be something wrong in how you have set things up

[sleek creek]

Turns out when they are instantiated as children they inherit the physics of the parents!

I have to unparent them.

Ty tho!

[timid dove]

That strongly depends on which components the various objects have

In general colliders only care about their own layers and they belong to the nearest ancestor Rigidbody

[sleek creek]

Yeah, it's on a ragdoll that has rigidbodies on it so it inherited from that.

[acoustic pond]

thank you so much

[inland frigate]

guys
can anybody help there? #1109579439047725096

[foggy condor]

Yo anyone knows on how to use isTrigger with the object still colliding

[foggy condor]

never mind

I don't even need the isTrigger

[tight topaz]

Hi
I'm doing MovePosition() and my object's collision is buggy and goes through the floor. I have the object's Rigidbody set to continuous dynamic. How can I fix this?
objRB.MovePosition(Vector3.SmoothDamp(forceObj.transform.position, camPos + (usedHand.transform.position - camPos).normalized * distanceOfObj, ref forceSpeedVector, forceSpeed));

[daring terrace]

Hi everyone! I think I may have a problem similar to the person above me, but when I try having collision with two connected objects, the connected object always seems to bug out and get excited. Sometimes it’ll just stop moving, or switch to an odd position. I’ve tried different methods of fixing this; however, they all unfortunately produce the same result. My goal is to have a “realistic collision” where the connected object rotates appropriately to the target (on collision). Any help / insight as to why these objects are behaving this way would be greatly appreciated! Thank you! (The video attached showcases what happens on collision when the target object reaches an “undesired” position).

[timid dove]

Without any further details we can only assume you're moving your objects in a way that isn't physics friendly.

To fix it, only move your objects in physics friendly ways. (Adding forces and/or setting the velocity)

[timid dove]

MovePosition ignores colliders. Use velocity or adding forces to move your object

[daring terrace]

Hi! Thank you for the response! In that particular example, I was using a configurable joint (which I thought was physics friendly, but yielded the same results as physics unfriendly ways). I appreciate your suggestion, and I'm going to look into PID controllers for a more realistic grab. Thank you!

[timid dove]

The configurable joint is only one piece of the puzzle though. How are you moving the object the joint is connected to?

Or whatever. The setup is unclear

[daring terrace]

And with that I realize how stupid I was 😭. I'm pretty sure that part of the answer lies within the fact that I was manually changing the transform (manipulating obj in scene mode) for lazy testing purposes, and it might work a little better when I attach it to a purely "physics driven" object in game? Even if not, I now understand that there are a ton of variables that I'm going to have to change. Thank you!

[fringe heron]

Physics.OverlapSphere() is not working... have no idea why this does not work:
This is the code, I check for a sphere and I am getting closer to it. it prints 0 everytime, no colliders found, I do not filter them using layer, everything, houses, objects have collider too but it cannot recognize, why? Can you help please? Bot has this script attached to it and player enters in area

[timid dove]

yes exactly.

[timid dove]

your colliders array is null (you never initialized it)

therefore there is nowhere to put query results

so it returns 0 which is the number of results it wrote to the (nonexistent) array

try adding this:

void Awake() {
  colliders = new Collider[10];
}```

or just initialize it in the field initializer:

Collider[] colliders = new Collider[10];```

Note that the size of the array you create will be the maximum number of results the query will be able to detect. So think about that and size the array accordingly

[fringe heron]

Ok but it does not work even when I try with Alloc Version

This is NonAlloc

Will try that in a moment

[timid dove]

I'm aware, hence my instructions for doign the allocation yourself

if it still isn't working at all - then perhaps the objects you are trying to detect do not have colliders or the position is wrong or something

[fringe heron]

Ok, the thing was with Networking Stuff

NVM, thanks for answer

solved

[tough pelican]

Hi, I have a 3D player with a Rigidbody and Capsule Collider. I have floor collision working properly but I'm struggling to get it working with a cube object. It works properly if I tap the movement key while facing the cube, but if I hold it down then I'll pass through the cube entirely. I'm sure it's an easy fix, but this is all new to me so I'm not sure what to do. I've tried changing the collision detection type of the Rigidbody and the sizes of the colliders, but no luck.

[wide nebula]

What code are you using to move the rigidbody?

[warped slate]

Is there a way I can calculate the top speed the speed variable, the rigidbody mass, and the rigidbody drag? I want to be able to calculate the maximum speed that my player character can go.

[fringe heron]

Hey how can I make ragdoll once and change skin mesh of character from script?

My character hierarchy looks like this:

and it is .glb file

and it is in A pose

[frigid pier]

@clear pewter Don't cross-post

[clear pewter]

ok

[timid dove]

Easier if you just implement the drag yourself

[raw skiff]

I'm having trouble with 2D physics, and I can't seem to get an answer in Beginner. Should I repost my query here?

[raw skiff]

I have a 2D platformer (using OpenGameArt sprites), where the character needs to be able to crouch AND be able to press crouch and jump in order to drop down 'thin' platforms.

I'm using two Tilemaps (Midground and OneWayPlatforms) on two respective different layers (Ground and OneWayPlatforms).

When dropping down, I use Physics2D.IgnoreCollision to temporarily ignore the OneWayPlatforms TilemapCollider2D.

When standing up from a crouch, I BoxCollider2D cast to make sure nothing on layer 'Ground' is above the character's head before the character stands up.

However, when standing back up from a crouch while standing on a OneWayPlatform with a OneWayPlatform above my character's head,
instead of standing up on the lower platform while the upper platform is now at the character's waist (expected behavior), my character is pushed 0.5442 units down until their vertical halfway point (waist) is now level with the lower platform - effectively, they're pushed halfway down through the lower OneWayPlatform.

Can anybody suggest to me why this is happening? https://cdn.discordapp.com/attachments/497874004401586176/1110586519779029002/image.png

https://hatebin.com/dqthvrylfo - Basic V movement (includes 'crouch' code)
https://hatebin.com/gbkfqinmqz - Specific drop-down code

[tough pelican]

sorry for the late reply; here's my current movement class https://gdl.space/cecanacuvu.cs

I messed around with it a little and discovered that the player doesn't phase through the cube when the movement speed is lowered, but changing the Rigidbody collision detection type doesn't resolve it

[fringe valley]

I have this parent scalling shit going on how do i fix it i have tried so many things online cant get it to fix And why is this a thing ?

[wide nebula]

This is the classic issue of moving by modifying the transform directly. You're teleporting it and not using physics at all.

Look up how to move a rigidbody, you'll find info on the AddForce function

[wide nebula]

If the parent is not uniform scale, the children will distort if the parent rotates.

[fringe valley]

how do i stop this

@wide nebulaI have tried separating objects with object with scale 1 1 1 but evertyhing i have tried doesnt work

[wide nebula]

All three of the parents are uniform scale in your screenshot?

[fringe valley]

Sorry but i dont know what u mean

There all children?

[wide nebula]

Your cylinder is a child of three objects, FR, Wheels and Cube.

[fringe valley]

yeah the cube has a scale of 4, .5, 2 that need to be that to be that size

[wide nebula]

Or in other words, those objects are the parent objects of the cylinder, and if those are not uniform scale, it will skew whatever is a child of it.

[fringe valley]

ok cool but i need the scale to be that to make it a long cubiod

and the wheels has a scale of 1 1 1 so that should parent scale of the wheels no ?

[wide nebula]

If that was a true statement, you wouldn't be having the issue.

[fringe valley]

so for me to make that cuboid i would have to go in blender make something like that then import back in unity with a scale of 1 1 1

[wide nebula]

Anyway. Create a new object Car and put your objects under that. The cube would not have any children. Make them siblings instead.

And yes, modeling it properly is also an option

[fringe valley]

ok thanks ill have another go

[toxic coral]

Any idea why the Ragdoll Creator is screwing up the head sphere collider so much? I don't understand why the radius is so super sensitive - mega large at ~0.08

[viral beacon]

if I add colliders to the bones of a prefab, then scale those bones when I instantiate the prefab, will that screw up the physics?

[small thorn]

Anyone know if there's a setting similar to UE's Can Character Step Up?

My character controller keeps climbing everything, even enemies 🤣

[timid dove]

probably due to the scale of your object? It's unclera since we can't see the hierarchy or anything

[fast escarp]

how would i go about making a catapult using mainly joints 3d

[viral beacon]

does unity support mesh colliders made of multiple convex elements?

[timid dove]

it would be a concave collider unless you split it into multiple convex meshes

[viral beacon]

so I would have to write a script that extracts each loose element from the physics mesh and assign it as a separate mesh collider

[timid dove]

maybe? The best approach is very detail-dependent.

[viral beacon]

wha

[tame karma]

Okay Guys, i have a little problem:
I have a player (just the capsule) that runs lets say with a speed of 10 and he can sprint, when he is sprinting it will then run at a speed of lets say 100.
And i have a box to collide with.
Both have a collider and the player has a Rigidbody with Collision Detection Continuos.
I am moving the player in FixedUpdate and am using Rigidbody.MovePosition instead of directly modifying transform.position.
Everything works fine until i sprint at the box, the player will just pass into the box and will start to fly up
I dont know why this happens, could anybody pls help??

And the code looks like this:

[timid dove]

MovePosition is not going to respect collisions

move your object by setting velocity or by adding forces

[tame karma]

@timid dove This works now, thanks.
But now, if i run against a wall and i'm holding W (So i'm still running against the wall) And then i want to like dodge it with A or D keys, it wont move to the sides, probably cause it still detects the collision and resets me to the point i am. This means i wont be able to move while i am running against the wall. This maybe doesn't seem that much of a problem, but its very annoying.

[timid dove]

maybe due to friction with the wall?

also you seem to be multiplying your velocity by deltaTime

which is not correct

don't do that.

velocity is already a "per second" quantity.

[tame karma]

Jup I did that, already wondered why i needed such a high speed, but what can i do about the friction so i am still able to move A and D?

And without Time.deltaTime it moves very inconsistent

[timid dove]

wdym by inconsistent

shouldn't be anything inconsistent about it

It would be more inconsistent with deltaTime

[tame karma]

I would like to upload a video but i cant right?

[timid dove]

why not

[tame karma]

I dont know if u can tell but the movement feels very sticky or like inconsistent

[timid dove]

I don't see anything weird no

the "stickiness" is because you're using GetAxis instead of GetAxisRaw @tame karma

[tame karma]

And its also faster when i hold W and D, it moves twice as fast probably cause it moves forward and right at the same time

It just looks a lot faster then

And with GetAxisRaw there is no like middleway its just -1, 0 or 1 i dont think this is the feeling of stickiness it makes it smoother i think

And the stickiness is if you only move in one direction cause then it seems very slow

[timid dove]

This is a common problem and easily addressed

targetvelo = new Vector3(_rightMovement, 0, _frontMovement);
targetvelo = Vector3.ClampMagnitude(targetvelo, 1);
targetvelo *= SpeedModifiers();
targetvelo.y = _yVelo;
rb.velocity = targetVelo;```

that order is quite important btw and you currently have a bug where you're multiplying the speed in after the y velocity is put in there which will be very strange when you actually start jumping

[tame karma]

So Vector3.ClampMagnitude(targetVelo, 1)?

[timid dove]

sorry yes

[tame karma]

Sorry for wasting your time and i dont know how to thank you but now it works soo goood
TYSM

[celest meadow]

is the rigidbody velocity value at the end of fixedupdate the one that is used in the physics simulation?

because my system uses a velocity cap that is applied at the end of fixed update, but idk if this works or not

[timid dove]

After FixedUpdate forces will be applied then movement will happen

So the velocity will definitely be able to change

[celest meadow]

oh, so when you use addforce in your code it predicts the result to give you a value but then all those physics updates are reapplied in the actual physics simulation?

[timid dove]

There's no prediction. They are applied one time, in the simulation

[celest meadow]

so whenever I have a line with addforce and then a line after saying (if rb.velocity ...), is the velocity not actually updated yet for that code?

(assuming this is all in fixedUpdate())

[timid dove]

Correct

Which is why when I need something like that I do the calculation with velocity myself

Rather than calling AddForce

[celest meadow]

you mean you set the velocity directly?

like if I do, rb.velocity = ..., then that is done, right then and there?

[celest meadow]

OMG THIS METHOD IS LIKE 1000x BETTER, it works perfectly, also, you're explanation makes perfect sense to why this weird thing was happening. Thanks so much!

[tepid carbon]

How can i make the obj + Avatar move to the beginning area when hit the specific collider.

example avatar flying on space ship and exit far away so how can i set space ship back to begining for new user

example picture

[neat forge]

Is there a way to make physics objects not transfer momentum upon impact but still collide? (without increasing mass)

[bleak umbra]

how do you collide without transferring momentum?

[neat forge]

literally just detecting the collision and that's it. I just needed for a very specific usecase and found a solution already

[bleak umbra]

you do that with trigger colliders or kinematic rigidbodies

[neat forge]

Yeah, i used kinematic

i can't really do triggers because my issue was i have a plane with aerodynamics, and a rigidbody bullet

[bleak umbra]

you can always add more triggers 😉

[neat forge]

and my solution was just to save the plane's previous velocity on impact, make the rigidbody kinematic for a singular frame, and then finally just give the rigidbody it's previous velocity

it works! and its not noticeable since it's not the player's vehicle that's being impacted

[bleak umbra]

that's a dirty hack, might be worth solving that with a trigger

[neat forge]

Maybe, but i don't think this solution is gonna cause me problems in the future.

I was thinking of TBH just doing a raycast instead but

[bleak umbra]

maybe its actually not that dirty, idk your game, might actually be a good idea

[neat forge]

It's a, flightcade thing wish sim-ish aspects. I wanted to make the player's bullets as physical as possible

[bleak umbra]

plenty of options if you ever have to revisit it

[neat forge]

Yeah

[bleak umbra]

i'd do my bullets with custom physics and raycasting, but thats just me

especially if you want aerodynamics

[neat forge]

I mean, i only wanted them on the AI (simplified) and on the player. For the bullets I think just a rigidbody bullet from a pool with a random rotation offset when being called works.

[fickle sparrow]

What would you guys use for this game in terms of rigidbody interpolation? continuous with interpolation set to interpolate sometimes produces duplaicate collisions with the oncollisionenter2d method. (ie, enemy forces is reduced by 2 on an enemy death instead of 1)

https://gyazo.com/1fc3defa246453d513e95ba9b131566e.mp4

Seems like "none" might be the best in terms of physics accuracy, but I'm not sure where interpolate / extrapolate differ there

[forest lance]

Pretty sure interpolation only affects visuals, it shouldnt cause duplicate collisions

But I don't think interpolation is necessary here, unless you see noticeable jitters and shakes

[fickle sparrow]

Ill investigate this further then. I was under the impression that the accuracy of the physics interactions changed alongside the rendering. Thanks 🙂

[dreamy whale]

how can i apply force to a specific point on a Rb? in this case i'm trying to lift the rectangle by the left side, but idk how to do it in unity

[unique cave]

Rigidbody.AddForceAtPosition

[dreamy whale]

I ended up finding it before, but ty

and it works(kinda)

now i want to cut it like in the image, where red is the slice and the other 2 colors are the gameObject vertices

but idk how to do it

[strong turret]

Hello, I've a mesh collider on a cylinder and set as trigger. Is there any way that onTriggerEnter only executes when other objects enter from only one of the cylinder's faces.

[timid dove]

Nope

You can track the previous position of the object and check where it was on the frame before it entered to try to infer that information

[strong turret]

Ohh, ok I'll try this.

[magic needle]

When I set my collision to Speculative, OnCollisionEnter gets called before objects have collided. i.e. it will get called and say there was a ground collision a few feet above and before the collision with the ground. Is this an intended behavior??

[smoky monolith]

Putting this here because I honestly don't know where else to ask;
I've been having a problem with rigidbodies and colliders there I'm not exactly sure how to fix. Essentially, I'm building my game in a modular block-based way sort of like minecraft. Each block obviously has it's own box collider. The issue I've been having is, when my player character tries to walk between blocks, he'll often freeze for a second when trying to cross between box colliders. Is there any way to let the character smoothly walk across colliders?

Edit for anybody who has the same problem and comes across this message: Fixed by changing the player collider from a box collider to a sphere collider. I assume a circle collider would fix it in 2D

[vague marsh]

Is it possible to use the "new" Unity.physics without ECS? Especially, spatial queries in Burst jobs?
And if so, is there a sample project of that somewhere?

[bleak umbra]

on the surface you cannot use unity.physics without unity.entities as .physics depends on .entities, so whatever you actually do in the end you need to present the .physics engine its world via .entities, you may choose to then extract that physics world back into GameObject land and not actually make your "game" with entities,

however:

In Unity Physics, core algorithms are deliberately decoupled from jobs and ECS. This is done to encourage their reuse as well as to free you from the underlying framework and stepping strategy.
and:
As an example of this, see the Immediate Mode sample. It steps a physical simulation multiple times in a single frame, independent of the job system or ECS, to show future predictions.
Sample:
https://github.com/Unity-Technologies/EntityComponentSystemSamples/tree/master/PhysicsSamples/Assets/Demos/6. Use Cases/6b. Immediate Mode

[vague marsh]

Thanks, will study that one then.

[rose lion]

Hi Guys

i Hope everyone doing good

i have a problem with RCC Physics

https://www.youtube.com/watch?v=4EZWuxxVGsc&ab_channel=PryszardAndroidiOSGameplays

I am trying to get the spline Guidance for track while keeping Physics intact.

but not able to achieve it.

[rose lion]

RCC mean, Realistic Car Controller

I am using Version 3 of RCC kit

just need Spline Assisted Car Movement on track, nothing else.

[shrewd mortar]

does somebody know why my rigidbody applies torque on axis other than the ones i specified? For the val Input im just using a Vector2 which i control with the left stick. This is my steering method which is supposed to rotate the rb on the relative z axis and the global y axis. but it also rotates my rigidbody on the x axis and i dont know why.

public void Steer(Vector2 val) { rb.AddRelativeTorque(Vector3.right * (val.y * inputMultiplicator) * (steerSensitivity * Time.deltaTime)); rb.AddTorque(Vector3.up * (val.x * inputMultiplicator) * (steerSensitivity * Time.deltaTime)); }

[timid dove]

1. Never use deltaTime with AddForce or AddTorque (and a corollary to this is it should only be happening in FixedUpdate)
2. You're using AddRelativeTorque in one case and normal AddTorque in the other.

[shrewd mortar]

okay why should i never use delta Time? is it because fixed update already takes care of that?

i rewrote it to use relative torque on both but the issue is still there

[timid dove]

In the default force mode, Time.fixedDeltaTime is already factored into the velocity change that AddForce/AddTorque causes

(and since it's using FIxedDeltaTime it's assuming you're calling it in FixedUpdate)

[shrewd mortar]

yep thats correct

but why is my player still rotating that weirdly?

[trail iris]

Hello! Does anyone know why OnCollisionStay points sometimes yield completely incorrect result?

https://cdn.discordapp.com/attachments/497872424281440267/1113137803916746872/image.png

this is the intended behavior

https://cdn.discordapp.com/attachments/497872424281440267/1113138136441171978/image.png

I simply drew red gizmos on all points of collision, and the first one is just... wrong

[timid dove]

because this isn't what oncollisionstay is intended for

it's not intended for overlapping objects. It's for dynamic physical objects touching naturally

[trail iris]

I guess that make sense, but still weird why if it will break iff the boxcollider is larger than 10x in any dimensions

And only at certain angle

So i guess a overlapbox or boxcast is my only option? Or theres something im missing

[timid dove]

It's not really clear what you're trying to accomplish or what any of the objects I'm looking at are, so I'll leave it at the fact that OnCollisionStay isn't going to get you that.

[trail iris]

Basically get results like this @timid dove

When two colliders intersect

[stuck bay]

Does anyone know why my formulas don't produce the same result as RigidBody.AddForceAtPosition? My torque seems to produce way bigger angular velocity compared to the rigidbody's internal code:

private void AddForceAtPosition(Vector3 force, Vector3 position)
        {
            AddForce(force);
            position.y = 0.0f;
            Vector3 centerOfMass = rigidbody.centerOfMass;
            centerOfMass.y = 0.0f;
            Vector3 torque = Vector3.Cross(position - centerOfMass, force);
            AddTorque(torque);
        }

        private void AddTorque(Vector3 torque)
        {
            if(torque.x != 0.0f || torque.z != 0.0f)
            {
                Debug.Log($"Torque not 2D! {torque}");
            }

            Vector3 angularImpulse = torque * Time.fixedDeltaTime;
            Vector3 angularVelocityChange = rigidbody.rotation * Vector3.Scale(VectorUtility.Divide(Vector3.one, rigidbody.inertiaTensorRotation * rigidbody.inertiaTensor), Quaternion.Inverse(rigidbody.rotation) * angularImpulse);
            angularVelocity += angularVelocityChange;
        }```

[solid willow]

Whats the best way to get a pre rendered cloth sim into Unity that will perform well on Quest 2 and doesn't require 3rd party APIs at runtime?

[zenith holly]

hey before I code myself into a corner I could use some advice on how to set up collision in my game. right now I just snap to the surface of a terrain layer and push a rigid body around and call it a day but that's not going to work going forward because slopes. the thing that makes it complicated is I'm doing the link between worlds perspective trick where everything is skewed 45°. I don't know if this should include my colliders or not though.

the picture below shows a "normal" side view then two ways I can handle my colliders in a skewed environment. I'm not sure which option will make more sense in terms of implementing physics and motion and slopes.

if it helps clarify the perspective trick, here's a camera view and side view of the same scene

[zenith holly]

never mind, i learned how to use a skew shader so all the actual geometery is normal lol

[torn dew]

Hey everyone! I'm fairly new to the whole physics and C#.

im having trouble making something move forward when the rigid body rotates down or up.

any input or ideas would be fantastic as ive been stuck on this for about 3 days lol

[timid dove]

You are trying to read components of your quaternion like they're Euler angles.

They're not

Stop doing that 😉

Besides that, quite unclear what you're trying to do.

[torn dew]

thanks! ill do a bit more studying with quaternion then.

essentially when the rb moves down on the x axis, i would like it to move forward on the z. and then the opposite for the else if statement

[timid dove]

when the rb moves down on the x axis
THis is very unclear

are you talking about position or rotation?

[torn dew]

rotation

[timid dove]

Try to be precise with your language, it's hard to explain spatial things in words if you are mixing up terms like that

[timid dove]

If you want to know if it's pointing up or down, use something like:

float angleFromUp = Vector3.Angle(Vector3.up, transform.forward);
bool facingUp = angleFromUp < 90;```

don't try to use euler angles for things, they're hard to work with and not unique

[torn dew]

right on, thanks for the help! time to go read up more on quaternions

[timid dove]

I recommend against it. It's not necessary to understand how quaternions work in order to use quaternions

you also don't need them for this

[torn dew]

what im trying to do is when the player provides input to rotate the object on the x axis (lets say the amount is 10f), the object will also move forward on the z axis

once again sorry if I'm bad at explaining things, i'm still fairly new

[timid dove]

you want a rolling ball

I think it will be a lot easier to "fake it". Do an approach like this:
https://learn.unity.com/project/roll-a-ball

[torn dew]

im trying to add a forward rotation mechanic

[timid dove]

All you need is a force up

from the rotor

the rest will come automatically

That's basically how my drone works:
https://www.youtube.com/watch?v=SIjaJeIvMmk

[zenith holly]

turns out i can't use a skew shader because of fundamental problems with that approach so i'm back to square one on this problem.

i need to set up a movement system that allows traversal of slopes where the maximum allowed angle depends on the orientation of the slope within the world. for example, if it's ascending in the direction of X+ or X- you can go up a 45° angle. but if it's ascending in Z+or Z- that number changes because of the perspective tilt. In Z+ (away from camera) a 45° incline is a "vertical" wall and the max slope should be in the neighborhood of 30° or so. But in Z- (towards camera) a sheer 90° wall is actually traversible - movement should only be blocked by slopes coming backwards at the player. and I don't really know what should happen with like corners, etc, where the direction isn't aligned exactly with an axis. I'm sure someone better at trig than me can figure this out but it's beyond my understanding

[untold python]

my player isn't moving when i use RigidBody2D

    private void FixedUpdate()
    {
        float moveInput = Input.GetAxisRaw("Horizontal");

        _rb.velocity = new Vector2(moveInput * _speed, _rb.velocity.y);


        //_anim.SetFloat("speed", Mathf.Abs(Input.GetAxisRaw("Horizontal")));
    }

Debug logs are working but it isn't moving, also on the picture i turned off script component, but it still doesn't fall

i think i did something wrong in rb

[tender gulch]

Does disabling the animator fix it?

[untold python]

nah

[tender gulch]

Take a screenshot of the whole editor, so that the whole inspector and hierarchy are visible.

[tender gulch]

PlayerMelee is active though.
Also, it would be better if you share the screenshots during play mode.

[untold python]

i have found problem but can't undertand why it's not working, so i have this method in Update(). Game works fine without it

private void JumpHandler()
    {
        if (Input.GetKeyDown(KeyCode.W) && _canJump)
        {
            _rb.velocity = Vector2.up * _jumpForce;
            //_anim.SetBool("isJumping", true);

            StartCoroutine(JumpCooldown());
        }
        if (_isGrounded)
        {
            //_anim.SetBool("isJumping", false);
        }
    }

_canJump is true but why if works if i don't press W

[compact widget]

heya, im learning tilemaps with composite colliders, previously I had seperate gameobjects for every floor and wall. i have a question about rigidbody2d static and dynamic.

I'm running into a problem where my character's Y velocity is never zero when it is on the tilemap floor, which is important for other code I have written. this problem is fixed when i set the tilemap's rigidbody2D to dynamic, but i'm assuming that's bad practice for stationary platforms. I didn't have this problem when I used individual gameobjects set to static. could I have some help?

[timid dove]

I'd probably just fix the code that requires 0 velocity

[cloud nova]

you mean the function activates even if you did not press W?

[compact widget]

will do.
is it a known issue or something? i still don't understand why

[zenith holly]

hey so i have a weird problem that i'm not good enough at math to solve, but I think i have some clues to lead in the right direction.

i need part of my character controller to basically do the following:

if it is, get the normal at the point of collision
calculate if on an incline and how steep based on the normal ("climb angle")
calculate the orientation of the normal in the XZ plane as an angle ("surface orientation")```

it's the last two parts that's tricky for me. first the climb angle - I think this is the angle between the normal and direction of movement? Is that correct? i also need to know if the normal is pointed towards +X, -X, +Z, -Z, or somewhere in between, what I'm calling the surface orientation for lack of a better name. I think the way to get that is by getting the angle between the normal and the +Z axis, is that correct? or is it the angle of the normal *without it's y component* compared to +z?? i'm really bad at spatial math, lol

[winter pulsar]

hello friends, I need some help with Obi rope, I want to implement snake with Obirope which increases and decreases in length, can anyone help me with that? thanks. Reference link: https://youtube.com/shorts/-4e_9SNNvBQ?feature=share

[bitter mirage]

Vector3.Angle(Vector3.up, _yourNormalAngle); This calculates a gradient from a to b

Might help

[bleak umbra]

you don't actually need much math for that

to get the directionless slope from the surface normal you simply do a dot product between the normal and the reference direction via Vector3.Dot(normal, Vector3.up), you can convert the result into angles or use it directly, its going to be a value between -1 and 1 with 1 meaning the normal is parallel to Vector3.up and 0 means its orthogonal to it.

To get a vector in a plane, you project it into that plane via Vector3 projectedDirection = Vector3.ProjectOnPlane(myDirection, planeNormal).normalized, in your case planeNormal is Vector3.up.

[timid dove]

It's just Vector3.Angle if you want the angle

[steel sorrel]

is there a unity physics developer i can ask something incredibly specific?

[bleak umbra]

https://dontasktoask.com/

[unique cave]

You can ask something incredible specific and hope someone experienced enough finds your question

[steel sorrel]

My concern was that I saw no talk about optimizing sleep/awake logic concerning rigidbodies that happen to be moved in Update().

They are re-activated, even if no force was applied to them.

They go to sleep 1 second later, but little shaking/errors add up, and it is just milliseconds of spike that could be entirely avoided.

It's just a bit annoying to have a script that has to manage forcing sleep/awake AND interpolation based on when it's needed.

Just milliseconds of checking wasted, but also costumers don't even care or notice it so ... meh 😕

[timid dove]

Rigidbodies should not be moved in Update 😉

And what kind of movement are you talking about when you say "no force applied"

[steel sorrel]

Teleporting and World_Origin Transformations

But there are loads of stuff that could be changed.

I'd even go as far as to prevent us devs to scale objects 🤡

The very fact that we CAN move rigidbodies in Update tells me they do recognize that some situations ask us to so precisely that.

[tough pelican]

Hi, I have a gun that shoots projectile bullets and I'm trying to implement the ability to kill enemies with it. The bullets have a Rigidbody set to continuous and a Box Collider with isTrigger set to true. The enemy has a standard capsule collider, and the OnTriggerEnter method inside the enemy script destroys the object. Only problem is that collisions only seem to work when you shoot the enemy from specific angles and distances. I'm thinking it's a Rigidbody or collider issue rather than an issue with the scripts, but I can send those if it would help

It seems to work better when you're shooting from further away

[steel sorrel]

either reduce the velocity and call it "style", or change bullets to raycasts and you fake its position along that path

delay the "deal damage" event based on the out Hit.distance gives you

or ... change the collider to continuous dynamic ... should only on the bullet, but in 2021 i sometimes see some colliders going through it, a bit wierd

OnTriggerEnter is a bit buggy from my experience, An OverlapSphere and checking the array never failed me

[onyx hollow]

is there a way to change the velocity of a rigidbody to be going to a position, as in it completely stops once it reaches its location

[tough pelican]

Hmm, yeah maybe I won't use OnTriggerEnter. Thanks for the advice

[steel sorrel]

what I was talking before, for maximum performance you gotta check if your agent ia close to the desided position and manually setting it to sleep 😴

Otherwise you risk keeping it awake with the force you add, then stop appting, it overshoots the target, and gets applied again

You can increase the drag if you want a cheap solution tho

[onyx hollow]

So if it reaches the position i just turn off the velocity?

As in set it to 0?

[steel sorrel]

you can .... you just have to make sure mo other forces that apply to it automatically, and that your desired position is not too close to a wall

setting the velocity to zero i remember caused collisions to jitter.

try AddForce(-rg.velocity, (...)Impulse)

[onyx hollow]

Btw this is 2d not 3d

[peak panther]

If you were making a hitbox system for a bullet hell, aka you're expecting hundreds of (pooled) bullets...
Would you use Triggers to detect collisions.
Or Physics2D.OverlapCollider?

[steel sorrel]

Most people would advise you to use triggers because it makes life easier, and you can even not give a damn about performance as you want to target rich gamers anyway 😦 ... so, if you are not experiencing any performance issues, go forward with triggers.

only thing to note, Overlap[ANY] only works for primitives .... you will have to handle non-convex mesh colliders with an exeption followed by a raycast

If a unity dev is reading this, I'd LOVE to be given some papers or documentation on the physic engine itself ... I fear that Static colliders are making calls and checks even when not needed

[peak panther]

Doesn't Overlap collider use the collider attached to the object?

Which definitely can be more than a primitive.

[steel sorrel]

ah, you probably are in 2D then! Box2D might allow for that, 3d does not

[misty chasm]

Hello, I'm trying to make a 2D car with wheel joints for the wheels, but if I don't freeze the z rotation of the wheels, they just end up getting deformed and scaled weirdly, and obviously if I freeze the z rotation, I can't go forwards. So what do I do?

[bitter mirage]

Have the sprite as a child of an invisible gameobject with the wheel joint and collider

[misty chasm]

what?

[bitter mirage]

A: Has all the physics - rigidbody with frozen Z rotation
B: Contains all the graphics, you can spin it all you want, doesn't even need rigidbody
Image taken from one my projects, imagine Coin is Wheel and it isn't a prefab but rather part of your car

[misty chasm]

Ahh thanks. Much clearer. Will let you know if it works

[bitter mirage]

👍

[misty chasm]

@bitter mirage I forgot, is the anchor of the wheel joint the one that's on the wheel of the one that's on the car?

[bitter mirage]

https://docs.unity3d.com/Manual/class-WheelJoint2D.html
Anchor and ConnectedAnchor in Properties

[misty chasm]

yeah @bitter mirage I'm still having the issue. Here's what my stuff looks like

if you need more let me know :)

[bitter mirage]

How are you rotating your sprite, and what is the issue you are having

[misty chasm]

i'm not rotating my sprite manually, I'm using the motor force thingy on the wheel joint

and what happens is my wheels get all streched

[ashen pier]

with raycasts, is there a way to ignore the collider of a gameobject, but not the collider of its child?

[unique cave]

By assigning different layers to them, should be possible

[bitter mirage]

I would rotate it using animations or something instead, link the animator speed to the car speed

[fringe kayak]

how do i make my tiles on the tilemap have collision?

[timid dove]

add a TilemapCollider2D to the tilemap

[fringe kayak]

thx

[untold python]

hey, why doesn't my player collide with obstacle in game mode and build version, but seems okay when i switch to scene

[timid dove]

Either your game camera is rotated or it's a perspective camera

[summer prawn]

hey is it possible to i have 60k constraint ? what is the meaning of these spikes?

[steel sorrel]

without seeing the above tab AND the hyerarchy below no one can tell

it could even be caused by you leaving the some physics object as selected in the editor ... wierdly enough, that causes performance problems (while using the editor)

[summer prawn]

there is no selected object

[summer prawn]

this is bug

there is no active contrainsts this needs to be fixed

[ashen pier]

when using raycasts, i have it setup so that a raycast will hit a gameobject, but the child colliders and not the parent colliders. however, when i use hit.transform.name, it gives me the name of the parent. is there any way i can get the specific child's name instead of the parent?

[quartz jetty]

hallo, i am working on a sonic game; is there an updated hedge physics project that i can learn how it works? (or anyone help and/or redirect me)

[steel sorrel]

i don't think I can understand what you are trying to do 🤔,

BUT, "anything".name should almost never be used.

[timid dove]

hit.collider.name

[dapper arch]

Hi. I want to make a demanding 2D game in Unity and I want the physics to be "rigid" (no acceleration or deceleration, all movements will be very jerky). Is there an option to disable every acceleration and deceleration in RigidBody2D to harden the physics or is it better to write it in clean code?

[timid dove]

Make your bodies kinematic and set the velocity directly in your code.

[dapper arch]

Thanks

[golden crane]

As Physics's nonalloc method like Raycast/Overlap Sphere and etc need Collider[] to be pass as an argument.
What if I make a global Collider[] in my project and reuse it everywhere instead of local Collider[] for each of the script that need to use the NonAlloc version?
Would there be any downside to this approach?

[timid dove]

I do this all the time, it's a good idea. The only concern is that it will continue to hold onto object references, not allowing them to be garbage collected. Best to clear the array every once in a while, such as when changing scenes

[golden crane]

oh oof. I didn't clear it thanks for suggestion!

[ruby frigate]

I think I need some help (or pointers in the right direction) from someone with more knowledge in mechanics 😉

I have a spaceship, that can rotate around it's axis with _rotationSpeed and move forward with _speed.

The spaceship moves, by setting a waypoint. It then gradually rotates towards that waypoint and moves forward at the same time.

This is all well, and works. But now I need to calculate the distance the spaceship will travel, until it reaches the waypoint.
But since this is a combination of a rotation and a linear movement, I'm at the end of my physics knowledge.

Can someone point me in the right direction?

[timid dove]

The distance is simply Vector3.Distance(startingPosition, endPosition)

the rotation has nothing to do with distance, no?

[ruby frigate]

That's the problem - it does.
Because when the object moves forward and rotates at the same time, the movement is not a straight line (that was what tripped me up).
But I don't know the formulas to calculate such a movement

[timid dove]

well for any given frame the distance actually covered towards the target could be calculated by solving this little right triangle

V is your velocity

T is the amount actually moved towards the destination

the green angle is the angle between your heading and the desired heading

Using Soh Cah Toa we can use Cah.
Cos(angle) = adjacent / hypotenuse
Cos(green angle) = T / V
T = V * cos(green angle)

This could be done iteratively based on the rotational velocity until the green angle reaches 0

at which point the distance left just becomes Vector3.Distance

[ruby frigate]

Ok, so to calculate this in one go probably somehow works with the derivative.

[timid dove]

I'd say the integral actually. The function above computes how far it moves towards the destination in a given frame.
We want to express that as a function over time and then add up the area under that curve (aka the total distance travelled) - hence the integral

[ruby frigate]

@timid dove I can't really find a formula or even an example on how to approach this.
But I found a heuristic that actually works for my problem, so I think I'll use that for now.
Thank's a lot for helping 🙂

[stoic spruce]

i have a dartboard and a dart, the tip of the dart is a box trigger. most times it seems that ontriggerenter fires too slow to be usable when throwing the dart at a imo resonable speed even though i've tried continuous and dynamic detection. changing the sim mode to update didn't help either.
i do have a get tag in the ontriggerenter, would that be possibly slowing it down to cause funky stuff?

it's supposed to turn the rb to isKinemtatic so it stays in place as soon as it hits the dartboard but it either phases through or bounces off before sticking to it

[timid dove]

It has nothing to do with computational speed, it's just tunneling

https://gamedev.stackexchange.com/a/192403

The best solution is don't make the collider a trigger

[gloomy hornet]

Anyone familiar with the Temporal Gauss Seidel PhysX solver type
I'm having a bit of difficulty with jittering joint chains

[low helm]

How can I rotate a Prefab? On Rotation its not working

[timid dove]

what is "On Rotation"? And why would you rotate a prefab

Generally you should leave the prefab's position and rotation at 0

you can position and rotate spawned instances as needed

[low helm]

how?

[timid dove]

By setting them in the instantiate call or by setting them after spawning

through the Transform

[pseudo ether]

I am having issues with Rigidbody2d.Cast - it does not return any Hits, regardless of situation.
I can have the object that is casting (Kinematic Rigidbody2d with polygon collider 2d) inside another Rigidbody (Static with box collider), and it still insists on no collisions.

public static void MoveWithCollision(Vector3 currentPosition, Vector3 targetPosition, float movementSpeed,
        Rigidbody2D physicsComponent)
    {
        var moveVector = (targetPosition - currentPosition).normalized * movementSpeed;
        var distSqr = Vector3.SqrMagnitude(targetPosition - currentPosition);
        if (distSqr <= 1)
        {
            moveVector *= (distSqr);
        }
        physicsComponent.velocity = moveVector;
        
        //var nextFrameMoveVector = moveVector * Time.deltaTime;
        /*ContactFilter2D filter2D = new ContactFilter2D();
        filter2D.SetLayerMask(LayerMask.GetMask("Wall"));*/
        RaycastHit2D[] results = new RaycastHit2D[] { };
        var resultCount = physicsComponent.Cast(moveVector,results,5);
        Debug.Log(resultCount);
        if (resultCount != 0)
        {
            physicsComponent.velocity = new Vector2();
        }
    }```
The Goal is to achieve movement without going into collisions of (in this case) walls.
I have so far tried:
- removing the ContactFilter
- increasing the range to an arbitrary number (5)
- setting both the object and the walls to dynamic Rigidbodies
Am I misunderstanding the use for `Cast`, or is something else not working as intended?

[carmine basin]

I'm racking my brain trying to figure out what the hell is up with the configurable joints

Because I can't figure out what space the target position works in

The position on each axis seems to be inverted for some reason

[timid dove]

It's in the object's local coordinate space

[timid dove]

You gave it a zero element array
There's no room for any results

It returns the number of elements it actually wrote to the array

Which will always be 0 since the array has size zero

results = new RaycastHit2D[10]:

[pseudo ether]

... well that would be it.

[timid dove]

You should do this and also make it a static member variable. The idea here is to always reuse the same array

[pseudo ether]

Ill do that, ty

The documentation even specifically says so - but not if you dont read the not
The results array will not be resized if it doesn't contain enough elements to report all the results.

[timid dove]

Yep. It also wouldn't be possible for the method to resize the array without using a ref parameter

[shrewd sluice]

hi is there a way to stop ghostcollisions on 0 width gaps. I have a few fastmoving objects, which collide with these gaps on every collison mode, and I don't want to change physics engine and/or migrate to dots (I am still not very shure what it is tbh). I am almost finised with my first big learning project with unity and would like to fix these ghost collisons. (unity 3d)
I rely on having a cube collider, since a capsule collider doesn't suit the specific purpose an a cube mesh with rounded corners also doesn't fix the problem

[random sleet]

Hey guys , in 2d when I shot the game object using add.force (the object has 2d collider and rigidbody) to a wall (the wall has 2d colldier also ) both of wall and the game object have a 2d physics material to make the game object bounce , the problem is when I shot the game object to the wall with a less than 90° angle the game object don't reflect with the same angle at the opposite direction, unity ignore the reflection angle if it less than 90 ° , when I shot it with a angle more than 90° it reflect correctly, so what is the solution?

[cloud fossil]

Is there a difference in the physics engine if I say the ball is 1 unit, gravity is 980, vs saying the ball is .01 unit, gravity is 9.8 units?

[timid dove]

Your best bet is to merge the colliders so there's no gap if possible

[timid dove]

Yes.

The masses will be all out of whack and floating point precision with the large numbers will be poor

There will also be rendering issues as the lighting model also uses meters, and the Shadowmap resolution will also be out of whack

[shrewd sluice]

how can I do it on procederal placed planes, is there a method to merge to planes or do I have to create a new mesh with the corner data of the planes?

[timid dove]

If they're all just flat you could just teleport one collider around under the moving object quite easily

Otherwise you're looking at some runtime mesh modification.

[shrewd sluice]

could joints work, I only saw it in the preview when searching for a script, so I am not shure about how they funciton

[eternal flower]

Hey, I am trying to get the twist correction from the animation rigging to work with spine twist. I already have some two bone ik set up for the arms which seems to be working fine. but I just cannot seem to get the spine to work. I set up some twist correction with the default mixamo model too to see if it had anything to do with the model and it worked perfectly after setting it up the exact same way.

https://screenrec.com/share/DfMU8lnWs5

Anyone know why this might be happening. I think it has something to do with the synty models as it only occurs on those. But I can't think of any special reason to this. Any ideas are welcome.

[twin nebula]

Is there a way to stop spring joints from drooping?

I've got a spring joint 2D right now and the more I move the object its attached to / the more I change the frequency the more it droops

[peak panther]

Apparently turning OFF a collider in a trigger will call OnTriggerExit, but turning ON a collider in a trigger will not call OnTriggerEnter
Is that correct?

[timid dove]

I thought it was the opposite.

[sharp dragon]

how i can fix this ?

[weak wolf]

How can I shorten the jump curve of my physics object, while keeping the same jump high?

Gravity Scale could work...

Yes it works

[balmy hedge]

Having some issue with Wheel colliders. Anyone have any suggestions or fixes for this drift?

[marsh prawn]

does anyone know why when i start the game all my parts just fall im following brackeys yt tutorial for the first game but when i try it everything just falls into the void

[forest lance]

probably missing colliders

[harsh relic]

My character keeps falling through the box collider 2d any ideas on why is this happening?

[granite osprey]

does a raycast fully inside a collider hit that collider?

[timid dove]

The documentation addresses this question

[granite osprey]

Yeah, i saw. they say to check use backface on physics settings, but this doesn't solve my problem. still getting no collision

now i'm trying to calculate if it is inside using bounds

[timid dove]

What are you actually trying to do

[granite osprey]

at object spawn i need to know in which area it is

[timid dove]

Depending on the circumstances either use your game's grid coordinate system (if it has one) or use Physics.OverlapXXX

[pseudo ether]

I am slightly confused with Physics2D.ClosestPoint. It seems to not be the closest point at all?

public static void HandleCollision(Rigidbody2D rigidbody2D, Collision2D collision2D)
    {
        collision2D.GetContacts(ContactPoint2Ds);
        //rigidbody2D.ClosestPoint()
        if (collision2D.gameObject.layer == Constants.WallLayer)
        {
            var deepestCollisionPoint = new Vector2();
            float minDist = 0;
            for (int i = 0; i < collision2D.contactCount; i++)
            {
                var entryPoint = collision2D.GetContact(i).point;
                var exitPoint = rigidbody2D.ClosestPoint(entryPoint);
                var sqrMagnitude = (entryPoint - exitPoint).sqrMagnitude;
                if (sqrMagnitude < minDist)
                {
                    deepestCollisionPoint = entryPoint;
                    minDist = sqrMagnitude;
                }   
            }
            TargetPoint = rigidbody2D.ClosestPoint(deepestCollisionPoint);
        }
    }```
The red points here are the points from `collision2D.GetContacts(ContactPoint2Ds);` the blue dot the `TargetPoint`
The Green outlines are the colliders of the ship and the box
The yellow lines are the connections between red and blue. I would expect these to be as short as possible.
My end goal would be to find the shortest way out of a collision.

Additional source of confusion: why are the red dots where they are?
I would expect them either at the vertices of my ships collider, or at the intersections with the box collider. They are neither

[hollow echo]

sqrMagnitude will never be less than minDist because it starts at 0. You should initialise minDist to Mathf.Infinity

so the deepestCollisionPoint would presumably just be (0, 0)

[pseudo ether]

... I failed my rubber duck. Thank you!

[gleaming gorge]

How can I prevent charactercontrollers from being pushed up when they collide or pushing into each other?

[maiden wolf]

so what's unity capable of in terms of real-time fluid physics? i'm thinking of something that can actually be splashed around/redirected and fill cups and stuff

instead of just 2d textures bouncing around

[bleak umbra]

unity does not have any systems that do actual fluid simulation. you'd have to make your own and the capability of those are only limited by your ability and knowledge. Or you could buy a 3rd party asset 😛

[green needle]

so i have rb movement and a physics material on the player and ground with bounce to 0, i still bounce though at high speeds, how do I stop this without just stopping up y velocity, because I still need to be able to jump?

rb.velocity = new Vector3(movDir.x * speed, rb.velocity.y, movDir.y * speed);
is how I move if it helps

[maiden wolf]

any third party assets that use metaballs that work on AMD hardware?

[haughty carbon]

I'm trying to create an active ragdoll. Any feedback?

[deft orbit]

Is there any way to make a rigidbody's motion be relative to another rigidbody? For example, if I have two rigidbodies A and B, and a force is applied to A, it should also be applied to B, but not the other way around.

If there is no force acting on B, its position and rotation relative to A's position and rotation should stay the same

[timid dove]

You could do it with separate physics scenes

The common example of this is like a ship with physics inside the ship

[deft orbit]

yeah, that's precisely what I'm trying to do

I've never heard of physics scenes, can you link some resources?

[cloud fossil]

doing tilt maze thing, trying to work out physics materials. There are so many variables to deal with, Bounce Threshold, ball, wall, and floor "bounciness", average, multiply, maximum. I'm stuck between "ball bounces infinitely off the floor and flies off the board" and "ball won't bounce off the walls at all". Am I asking too much of unity? Are there more things I need to check? Do I need to scale my forces down further?

[viral ginkgo]

@cloud fossil I think playing around with the dampening option on the ball rigidbody may be helpful to you

[gleaming gorge]

try adding physics material with less bounce to the floor

[fading wyvern]

how do you make the start and end points of an edge collider 2d meet?

[maiden wolf]

i'm looking for fluid physics that uses polygonal metaballs that can be splashed around/redirected and fill in stuff like bucket's, is there anything like that for unity that works with AMD hardware?

also since this would be for a game i want to be able to lower it's level of detail the farther i get from it, that can be done with metaballs right?

[timid dove]

Obi Fluid is a good asset that does this

[pulsar canopy]

I'm using a character controller for movement and I have controller jump for jumping. Every now and again, my character will fly up into the air above the camera then come down. I notice it only happens when it's colliding into something while running into it and jumping

how come this happens when I am not using a rigidbody or anything that would direct my character to fly up into the air?

Here is an example

[timid dove]

Seems clear that it's a bug in your code

The CharacterController does exactly what your code tells it to do. Time to start debugging

[maiden wolf]

is there a version that's compatible with HDRP?

[timid dove]

Says no on the asset store

[rare juniper]

How do you add a mesh collider to a humanoid model made up of multiple child gameobjects with skinned mesh renderers?
I want the colliders to be very precise so I'd like to use a mesh collider if possible. I need to be able to detect collision on the human.
Should I add a mesh collider to each body part or combine all of the meshes and then have a mesh collider at the root level?

[timid dove]

mesh colliders on animated rigged models are generally not compuitationally feasible

generally the collider is built up of many primitives

spheres, capsules, and cubes

all attached to the various bones on the model

[rare juniper]

Is that what you would do even for a model controlled by an XR rig?

[timid dove]

Yes

For example:

[rare juniper]

Okay thanks!

[quartz wyvern]

is there any api to know if a collider is entirely inside another and doesn't protrude

triggers alone wont really work but not sure what functions to use to test it

[bleak umbra]

only for individual points, which you can use to make your own custom API based on the shapes of the colliders you are testing against each other

[quartz wyvern]

hm i see

[quartz plinth]

hey, my animator got childs with colliders on them. they are causing the parent rigidbody to move for some reason, anyone know why?
they share the same Layer, and i've made it so it shouldnt interact with itself.

[rose mulch]

On Apple Silicon, are Physics GPU accelerated via Metal or is it all on the CPU?

[timid dove]

All modern CPUs (including the Apple M1/M2) include an integrated GPU. It's also possible for your machine to have a separate dedicated GPU. In either case, GPU code is running on a GPU, not the CPU.

that being said, in Unity Physics are all done on the CPU not the GPU unless you're using a third party library

[wise tinsel]

Is there any way that I can make rigidbody with concave colliders?

like

can havok do it maybe?

[twilit yacht]

use several collider

[wise tinsel]

dang

[twilit yacht]

[stuck bay]

I'm used to normal Physics.Raycast where layermask is used to ignore a layer, but first time using Physics2D.Raycast and learning that layermask works the opposite (for some reason).

Is it possible to selectively ignore a layer with 2d raycasts the same way you would for normal raycasts?

(Also who decided to make them different in the first place??)

[timid dove]

they work exactly the same way

they are not different

not sure where you're getting the impression they are opposite

[stuck bay]

okay i was definitely just confused by the different wording on each respective API page + another mistake that i was making

[lunar tulip]

How do games like universe sandbox 2 calculate orbits with 0 eccentricity? I couldn’t get my head wrapped around that. Is there a general Formular with variable eccentricity?

My goal is to calculate the needed velocity to have an x amount of eccentricity orbit giving the semi major axis of both planets. While the bigger one is stationary, the orbiting planet isn’t. After that, I want to apply the calculated force to the object (rb.addForce(perpendicularangle*neededvelocity, ForceMode.VelocityChange))

[timid dove]

A 0 eccentricity orbit would be a circle, is that what you mean?

[lunar tulip]

Yes

[timid dove]

If you want a perfect elliptical orbit use the parametric equations for an ellipse

It's not immediately clear that applying the physics engine (which is based on discrete time steps) is likely to create a realistic elliptical orbit

Although Sebastian Lague's orbital exploration YouTube video seemed to have decent results with such a system

[lunar tulip]

I have my idea from his channel, I want to pair procedural generated planets and orbit simulations.. I don’t know if calculating positions rather than apply physics is as exciting

[winged herald]

My CompositeCollider2D skips sections of my tilemap, even though these tiles clearly have a collider. It works fine when I remove the CompositeCollider2D, but I need it to reduce lag.
What's wrong with it?
It's very weird.

When I change a tile in the area that is being skipped, it forces the mesh to correctly rebuild

But ONLY in that area

When i manually rebuild it using the API, it does not work

[haughty carbon]

I've also been trying to create a ragdoll active game but I don't know what's best for movement, mapping movements from a Animation or coding leg and hand movements

[tough path]

I'm making a CS:GO-like surf game and I've modeled parts of ramps in Blender and imported them into Unity to be able to make modular maps, like so:

And I snap the objects together with the vertex snap tool when holding V

problem is, whenever the player slides over the seam where the two models are touching, the player jerks, as though it just hit a speed bump

which I find really strange because the objects are 100% flush with each other

Both the straight ramp and curved ramp like you see in the photo have mesh colliders (checking/unchecking convex does nothing)

Any ideas?

[strange zenith]

Sillyish question, but how would I prevent players from being able to jump off of objects they're holding? similar to how in half life you can grab an object, put it underneath you, and spam jump to be able to jump off of it infinitely.
My friend told me to do a grounded check on the objects, but what if multiple objects are stacked ontop of each other? Would I have to make a grounded check script for each physics object?

Adding jumping n gravity and grounded checks rn so any insight/ideas greatly appreciated.

[strange zenith]

also I've seen this problem happen in CSGO surf maps normally

maybe try exporting it as one model in blender and seeing if it works then. It might be the topology of the model maybe or something to do with physics calculations transferring between models

[I'm a newbie tho so maybe dont listen to me lmao]

[tough path]

That's probably it. I just don't want to have to design the maps in Blender but if it comes down to that, so be it

[tough path]

If it's only objects that you're holding, maybe you could assign them to a new layer and just do a check if they're on that layer

Is that what you're going for?

[strange zenith]

ig ye but like the inverse I just want to have both a grounded check for jumping and once I implement the ability to pick up objects, to be able to pick up objects and not use them to fly

that could probably work tho

[tough path]

Right so then just make them not on your ground layer

How are you currently checking if the player is grounded?

[dim fulcrum]

I'm trying to make an "active ragdoll" and have several problems because of my approach. For reasons I want my ragdoll to be constructed from separate objects connected with rigid bodies. This somewhat works, I managed to connect it all up, set the proper anchors primary axis' and range of motions. The ragdoll collapses acceptably, but compared to a "normal" ragdoll created from an animated model "normally" I'm not able to move it around as I'd expect. A normal ragdoll you can move in the scene view "like a rag doll", my ragdoll jolts erratically, and sometimes explodes even though my break forces and break torques are set to infinity. Is there anything I can tweak, or is it just expected behaviour? I'm trying to validate that I didn't mess something up before trying to copy animation movement onto it.

[lost lagoon]

Hey, up until now, I've been moving objects(by directly modifying the Transform) and detecting "collisions" via script (using Physics.OverlapSphere) to detect overlapping objects and apply necessary corrections. Recently, I've been told that this is not a great idea as it causes Unity to (partially or entirely?) recalculate the physics scene due to the lack of a rigidbody on the object. Additionally, there seems to be conflicting information regarding whether it is okay to alter an object(which has a rigidbody) via Transform.position/rotation instead of using Rigidbody.MovePosition / Rotation. If anyone could clarify how I should proceed, I would appreciate it very much.
Note: I have no interest in using Unity's physics simulation (collision system), however I would not mind allow Unity to detect triggers and then implementing my corrections in "OnTriggerEnter" for example if need be.

[dim fulcrum]

I'm almost sure unity won't calculate any physics unless you add a rigid body to your objects. You can add colliders if you want collisions to be detected, but setting "isTrigger" on them will also prevent any collision simulation and simply call your ontrigger code.

[dim fulcrum]

sorry I missed that you have rigid bodies, not sure why you use them since their purpose is to run the simulation?

[weary anvil]

Hi, have some odd behaviour with RB's. I am trying to push a Box collider using another box collider. At angles, this works well, but when the surfaces are flat against each other, there's no force against either objects 🫤

[split dew]

I am using HDRP's water system to create an ocean. I want to create a controllable boat on that ocean. I assume it has to do with with floating phyiscs to react to the simulation of the ocean itself (i guess?), can anyone point me in the right direction of how can such thing work? I have no idea where to begin

[timid dove]

how are you moving the object?

My guess is you're teleporting it, not moving it properly with physics

[onyx olive]

I'm not a master of physics or unity, but you definitely don't want this simulated - make it in code

[split dew]

Got a youtube tutorial of having it use physics for boyancy. It's working nice (apart from the fact that the ocean waves doesn't make things drift away) but its good for now. Only problem is it having conflicts with the movement controls of the ship itself (which also uses physics), just gotta do some polishing i guess

[onyx olive]

oh thats cool

could you link it

also its not the water that makes things drift away, its the wind

epic gif

[split dew]

https://www.youtube.com/watch?v=v7ag-NeSMSQ there you go

[split dew]

aaa yes makes sense

[onyx olive]

sick thanks

[split dew]

my pleasure :)

If you figure out how to make it work fine with a good controller that simulates ship movement, that'd be lit

[onyx olive]

you could maybe add a rigidbody to it and just use forces

having the water affect the speed is a bit beyond that but if ur just looking for controls that could be it

[split dew]

ye im trying to. Tbh im beginner with how physics work so I am using GPT to help with it, but its been causing certain conflicts/issues that just are gone when i disable the boyancy script

I assume its forces opposing each other or sth along those lines

[onyx olive]

how are you adding the forces?

[split dew]

Boyancy or movement? Or both?

[onyx olive]

movement

[split dew]

lemme find the script

private void FixedUpdate()
    {
        float horizontalInput = Input.GetAxis("Horizontal");
        float verticalInput = Input.GetAxis("Vertical");

        // Calculate the movement direction based on input
        Vector3 movement = transform.forward * verticalInput * moveSpeed * Time.deltaTime;
        
        // Apply the movement force to the ship
        rb.AddForce(movement, ForceMode.Impulse);

        // Calculate the rotation based on input
        Quaternion rotation = Quaternion.Euler(0f, horizontalInput * rotationSpeed * Time.deltaTime, 0f);

        // Apply the rotation to the ship
        rb.MoveRotation(rb.rotation * rotation);
    }```

very basic script for forward/backwards movement and rotation to be polished later, but apparently whenever its moving forwards/backwards, (i.e. im holding w or s), it keeps stopping and going, like some kind of stuttering

aand when I disable the boyancy script it works flawlessly

[onyx olive]

thats weird

sry I can't help u much more

[split dew]

its np i'll play around with stuff till I figure out the solution