⚛️┃physics

[unique cave]

Why did you keep it? You dont want framerate dependent movement right?

[rare pike]

Nah, just a nice float value now really.

[unique cave]

I don't think you quite understand. the player movement will look jagged and not consistent with your slide amount on the screen depending on the framerate, that's just terrible game design. It would be so easy to just remove the deltaTime and crank up the speed. Even though the "float value" seems nice right now, it surely will not be on build let alone on different platforms where the framerate can be many times more or less than on the editor, the point of removing the deltaTime is that the game will feel the same no matter how fast the game runs

[brazen pier]

I am running into the issue of when I am applying a rigidbody to my player, and having a wall that has a box collider, the player is just going right through it. Am I missing an option in the rigid body that should be stopping this?

Here is the collider for the wall

[unique cave]

IsKinematic being set to true means the rb will not simulate collisions etc.

[brazen pier]

Yea I know, I tried it set to false as well and same thing happens

[unique cave]

How are you moving the player?

[brazen pier]

MovePosition

[brazen pier]

Ah wait, MovePosition ignores collisions doesn't it

[unique cave]

It kinda does, yes

[brazen pier]

Should I use Player.velocity then?

[unique cave]

Yes

[brazen pier]

Alright thanks :)

[unique cave]

I think on 2d physics, MovePosition respects collisions better

[brazen pier]

Ah, that makes sense why the example worked better in 2D then

I am in a 3D environment

[full perch]

Is physx 5 support going to be added?

[unique cave]

Knowing how unity works generally, probably during next 5 years 😁

[potent notch]

omniverse (which has physx 5) is apparently going to have a unity connector in beta by the end of this year, assuming unity and nvidia keep their promises

[full perch]

thanks

[stuck bay]

anyone familiar with why my player's y velocity would slow down before touching the ground but also before actually contacting with it, doesn't seem like a problem the code itself, the velocity is about -8.8 units/second down at the end of my fixedupdate and with no changes between on the next fixedupdate the velocity is far lower at -2 units/second, and then it ends up being slightly above the ground when instead it should've already touched the ground if the velocity had kept going up till it fully contacted

my friction / drag and gravity is implemented in my own code since i wanted it to be different for the y velocity and xz velocity, so there shouldn't be anything decreasing velocity after fixedupdate normally, and there isn't but it seems to be different when getting close to objects

just wondering if this has to do with some setting i could change or make more precise for my player specifically, I guess I just assumed it would keep going fully until it actually contacted with the object?

[bleak umbra]

From what you‘ve described, it’s probably something in your code or specific setup. Nothing springs to mind as a common issue giving that result. If you want help, you probably have to share the relevant code.

[wintry sonnet]

Hey I was trying to make a shoo script and I followed several tutorials but they all stopped working, when I added the raycast, it either hit the player collider or stopped for no reason after a certain distance, does anyone know why this is

I’m not home rn but I’ll post my code in like 10 min

It’s a short script so it’s easy to fix and modulate

[stuck bay]

i can share the code w you if you want

idk how it'd be my setup but i guess it could be idk

the velocity at the end of my fixedupdate is -8.8 and then by the time it loops back around again its -2 so

its something happening after fixedupdate at least which i dont really have anything that would do that

[timid dove]

Between two FixedUpdates can either be:

• just the physics simulation
  or
• 1 or more entire game frames AND a physics simulation

so it could either be the physics simulation or... literally anything else, including Update etc..

[stuck bay]

dont have much besides the physics at this point but ill look fo sho

[stuck bay]

what should i post?

codewise

actually ill setup a second component and put it in a base project and see if it bugs out in another project first ig

[stuck bay]

https://pastebin.com/620bMa3z

heres the component im using

just goes on a normal boi with a box collider

all of a sudden there's just 0 velocity the next time fixedupdate is called

but the object still hasnt actually collided with the ground apparently

and then it falls for a couple more ticks before actually settling

tried on an empty project and was still the case so idk if theres some setting i can change to make it not do this

[bold thunder]

try using oncollisionenter instead of stay

[stuck bay]

damn if its that im dumb LMAO

probably is

brain error

[stuck bay]

thanks lol im dumb

[bold thunder]

np

[stuck bay]

sometimes brains do not work indeed

[bold thunder]

its k

almost never use oncollisionstay unless its like a scanner kind of concept of something?

[stuck bay]

probably still gonna put it but with the same checks i think

[bold thunder]

o

[stuck bay]

if i spawn my player on the ground without the stay it doesnt get grounded so

probably starts collidied so never enters? idek lmao

[bold thunder]

hm? is there a visual?

[stuck bay]

cant hurt either way i think

[stuck bay]

i just wasn't able to jump and friction wasnt applying as normal i was sliding on the ground so

idk lemme check again w/o it ig

yeah for whatever reason with just oncollisionenter if i spawn on an object i never get grounded so

[bold thunder]

is there a reason u need the ticks?

[stuck bay]

i assume if you're already in contact with something it'll never call oncollisionenter in fixedupdate

ah yeah that code is minimalistic but in my main thing friction & drag dont apply the first tick on the ground

er sorry just friction

brain fart

[bold thunder]

have u check the gameobject collider to see if its correct?

[stuck bay]

it works fine when i use oncollisionstay so

[bold thunder]

o right

[stuck bay]

i just assume its oncollisionenter not calling when the game starts is all

i just moved the calls to another function and called it in enter and stay works fine

[bold thunder]

i mean the forloop wont work in the oncollsionenter

since it only triggers once

[stuck bay]

worked fine

[bold thunder]

huh..

ig u have to w8 for someone. ps cant help

[stuck bay]

pretty sure the function is called for each collision

and the collisions each have seperate contacts so

works fine

[stuck bay]

nothings wrong anymore lel it works fine

[bold thunder]

ohhhh

ps i misread

[old tundra]

Why is my suspension very bouncy? I'm pretty sure its something with my math.

for(int i = 0; i <= raysNumber; i++)
{
    Vector3 rayDirection = Quaternion.AngleAxis(i * (raysMaxAngle / raysNumber), transform.right) * transform.forward;

    if(Physics.Raycast(transform.position + WheelHubPos, rayDirection, out hit1, wheelRadius))
    {
        radiusOffset = Mathf.Max(radiusOffset, wheelRadius - hit1.distance);

        // Suspension ----------------
        lastLength = springLength;
        springLength = hit1.point.z / raysNumber;
        
        springLength = Mathf.Clamp(springLength, minLength, maxLength);
        springVelocity = (lastLength - springLength) / Time.fixedDeltaTime;
        springForce = springStiffness * (restLength - springLength);
        damperForce = damperStiffness * springVelocity;

        suspensionForce = (springForce + damperForce) * transform.up;
        rb.AddForceAtPosition(suspensionForce, hit1.point);
    }

    Debug.DrawRay(transform.position + WheelHubPos, rayDirection * orgRadius, Color.green);
}

[wintry sonnet]

Physics.Raycast hitting playerCollider when angled at anything above 25 on the x, can anyone help

[honest oasis]

https://assetstore.unity.com/packages/tools/animation/dynamic-bone-16743#asset_quality

Is there a way to share this to my friend who's working on the same project as me

I bought it but Idk how to share it to him

[slate sand]

do i need to use a rigidbody on my objects in order to be able to apply colliders physics?

[long fossil]

From how I understand it, if two objects are colliding one needs to have a rigidbody for it to work

[coral mango]

Send him money and have him buy it?

[mighty falcon]

how can i prevent another game object that is running into my player from pushing my player

[mighty falcon]

anyone?

[bleak umbra]

Make either one kinematic or put them on different layers and disable collisions between them

[light cradle]

hey everything works fine, but after build, i have the problem that the enemys just won't move anymore and act like kinematic (they are not i checked) (i use rb.AddRelativeForce at them when attacking them) any ideas? in unity it works

[timid dove]

differences between builds and the editor often come down to one of these:

• framerate-dependent code
• execution-order dependent code (this is where I would look first for your issue)
• platform capability differences
• game resolution-dependent code

You can and should debug your build as normal - by printing logs and/or attaching the debugger

(make a development build for this)

[noble zodiac]

I am getting very desperate here. I have been trying to figure out for so long how to use angular velocity to match rotation with another rotation. I have no idea what to do rn cuz i've tried everything. Closest i have gotten is Z and Y axis working but not X.

I'm starting to feel like its not even possible even though i know it is.

[noble zodiac]

Or alternatively should i try another apporach? The reason i want to use angularVelocity is because I want the movement to be affected by mass of the object being moved.

[haughty fractal]

Hey all

Okay, let's say I'm launching a ball. I want this ball to go in a hoop or large funnel. This is 100% physics based.

I'm using addforce @ the target direction, but this doesn't accomodate obviously for any arch or anything, force is just making the ball sort of fly at the target rather than compensate for the distance and angle.

Is this trigonometry I'm looking for? And if so, what kind of equations? Not looking for code, just the right direction to research since math isn't my best skill (trying to improve)

[timid dove]

You're basically looking for a set of equations called parametric equations for projectile motion.

https://youtu.be/7UT6RuRiOFY

[tawdry finch]

How can I stop it from going up? I checked constraints on the Y axis, but it doesn't seem to work. (ignore the low quality and fps)

[haughty fractal]

Thank you very much

[normal leaf]

Hey, I'm trying to make a realistic blob simulation in unity. I found a method by added a cloth component to a sphere, but it works alright. Is there any presets in the cloth component that would the sphere look like a blob or would generate a sphere using code and altering it vertices be better. Thanks.

[normal leaf]

Do you mean you want the player to fall?

If so, you have to uncheck freeze position on the y in the Rigidbody component.

[tawdry finch]

i want it to not move on the Y axis

[normal leaf]

Oh

So you dont want the player to go up the ramp?

[tawdry finch]

nope

[normal leaf]

Its part of the Character Controller, you could prob make the slope limit 0

[tawdry finch]

hmm i only have a rigid body and box collider on it

[tawdry finch]

Actually, that was another one, but even with the slope 0 it still goes on top of the ramp if it's above the player

or if the object is small

or if that is not possible, then how can I make it move normally up and down on he ramp?

[pliant fern]

I'm still stuck on how I'm meant to do this, I know I probably need to calculate something relative to the sphere's movement to figure out what rotation should be applied to the tube, but I have no idea how to figure out what that would be, I'm trying to make a water slide simulation where the tube moves accurately, and currently its rotation never changes because it's just following a sphere, but I want it to rotate according to the way the slide is as it would in real life

I've tried not using following the sphere but I haven't been able to get the physics right

I haven't been able to find anything helpful so far

this video is what it still looks like with the tube just following the sphere

[upbeat birch]

Is it possible to access vertices of a mesh collider on a static mesh? I'm trying to estimate the slope of a surface without an array of raycasts in a grid pattern.

[stuck bay]

so i have a box collider and a player that is a box collider and when they impact on corners i get a collision normal of (0, 0.46, 0.89), is there any way to make it so i only get normals like (0,1,0) or (1,0,0), etc

not too sure about the inner workings of why that's a thing but i assume it has to do with resolving corner collisions where it could be multiple normals?

would appreciate some insight on it

[upbeat birch]

Is this a normal of a hit point in the world space?

[quaint iris]

Noob question: I have a ball with a rigidbody and a collider, a board with a rigidbody and collider at a slight incline, and two flippers with a script that makes them move in a certain direction. The idea is that when the flippers hit the ball, the ball gets launched back up the board. At the moment the result is that the ball is kind of stuck to the flipper while it moves and then continues when it doesn't. Changing the bounciness values on all three elements doesn't seem to work.

[stuck bay]

not sure why but it fixed when i combined everything into one mesh collider so i guess that works

i have an issue now though where i get stuck against the sides of objects and fall slower even though i have physicsmaterials with 0 friction on everything

[upbeat birch]

It's hard to imagine without the context.

[spice mirage]

does the flipper script update the transform of the flippers, or accelerate them via the rigidbody?

in order for the flippers to accelerate the ball, the flippers need velocity

not just update their angle

so if you have a script that basically just turns their angle. as far as the rigidbody is concerned its as if they are always at 0 velocity, but is incrementially teleporting forward if that makes sense

you have to setup a hinge constraint on the flippers and give a rigidbody impulse when you wanna flip them

[quaint iris]

Thanks for the responses! I had a script that added torque to a rigidbody. But I had a parent gameobject with an rb and a child with an rb and a mesh collider so that it would be turned around a different axis than the center. But it turns out having 2 rigidbodies was creating problems

so I removed the rb on the child and now it's producing the correct behaviour

[reef sierra]

Hey peeps, can't seem to figure this one out assuming its just me not understand correctly, code below
prints RWrist(Collider name) and 2222(Gameojbect name not collidername)
Any idea how I would get the actual collider name for otherCollider, cant find anything online related to this

 private void OnCollisionEnter2D(Collision2D col)
    {
        print(col.collider.name + " And " + col.otherCollider.name);

    }

[timid dove]

components don't have their own names. They use the names of the GameObjects they're attached to

what are you actually wanting it to print?

[reef sierra]

I have 2 stickfigures hitting each other currently, so wanted to get what body part hit what body part to determine damages etc

[timid dove]

and the body parts are modeled how?

I'd recommend the body parts be separate GameObjects if they're not

[reef sierra]

currently like this handsome person

[timid dove]

good

[reef sierra]

I think I see some of the issue, because the parent object has a rigidbody and that i renamed the the game objects names its returning that name

if that makes any sense lol

[timid dove]

not super following, no. col.collider and col.otherCollider should be the two specific colliders involved in the collision. The parent rigidbody would come from col.rigidbody but that shouldn't matter

[reef sierra]

this will prob explain it a little more

[timid dove]

do you have colliders on the root objects?

[reef sierra]

yea which I think might be the issue, technically the root object is the body

[reef sierra]

@timid dove Thanks for your guidance, figured it out, was because the othercollider in this case reports itself which was the collider on the body, needed to move the script for collision detection to the bodypart I wanted the trigger on

[viral beacon]

how do you set the project wide max angular velocity?

I cant find it in the physics project settings and "max rotation speed" doesnt work

no please dont tell me I have to do it per rigidbody

crinnnng

[viral beacon]

Is there a way to exclusively joint constrain a single axis of one rigidbody to another, like if I wanted to make a CV-joint type interaction. I currently have a u-joint like setup where the final body in the chain is joint constrained to the previous body, and this pattern is repeated until the body that has the actual force applied to it, but as angles are introduced the movement begins to get violent and inconsistent.

[timid dove]

it's in project settings under Physics

"Default Max Angular Speed"

[viral beacon]

ah, thanks

[quartz wyvern]

for any given collider on a GO how do you check if it overlaps any other collider in the scene to know if you can place it down

overlap functions only seem to over primitve shapes not things like more complex mesh colliders

[simple hearth]

When I uncheck "Trigger collider" option, the object throws itself with a huge power of rigidbody velocity

how do I prevent this, why does it do that

there is no other collider but a box collider inside the AI object which is the object I am talking about

**fixed

it seems like the Character Controller has a collider itself

and I forgot it there

that was the problem

[timid dove]

Do you really need that level of accuracy for placement? You should be able to get a good estimate with one or a couple of those primitive overlap checks

[timid dove]

1. CC doesn't have a collider it IS a collider
2. You shouldn't mix CC and dynamic Rigidbody

[long fossil]

I want to make it so that the blue ball is moving towards the left and when it hits the green player it pushes it towards the wall and when the player is being crushed inbetween the ball and the wall I want to kill the player,

how would you go about doing this?

I have tried like 4 different methods they work until the player gets pushed into the terrain one way or another

How do I deal with this

[brave latch]

wtf

[onyx timber]

my game randomly started removing my box colliders and rigidbodies any ideas why?

[unique cave]

Its not because of randomness, that much I know

[onyx timber]

well it worked yesterday. today all i did to the objects is added a coroutine into the script. and then i noticed my collision weren't working. so i put the script on a new cube and it works. check scene view when playing and the rigidbody and box colliders are there before pressing play. and dissapear when i press play. so i tried removing the coroutine. but didnt work 😦

oh i also copy and pasted a bunch of them. but i dont see why that would affect it

[unique cave]

Its really hard to help with this little information but im pretty convinced you did change something / dis something in your code that made it work like that, things doesnt happen randomly

[viral ginkgo]

You can get collision points from OnCollisionStay callback

You could kill the player if there are two contacts from left and right at the same time I think

Hmm but might return you just the corners if everything is a cube

I guess best way to do this is to check with ray or boxcasts both sides during OnCollisionStay

[long fossil]

thats what I have been doing

I'll mention you in the other channel where I sent the video

everything would work fine if only the player wont get pushed into the terrain

it somehow makes it past the terrain collider

every method I try thats the thing that ruins it

[viral ginkgo]

@long fossil Haha you really squashed him

Thats nasty

[quartz wyvern]

well i want to be able to check that the object is inside the perimeter which could be a custom defined shape it can't protrude outside of it

[frail kelp]

Can anyone help me get area effector 2d to apply drag? Game is 2D top down, I just want something that when anything moves over it it slows it down (drag) but it doesnt seem to be working

[timid dove]

how are you moving the object(s)?

[frail kelp]

Adding velocity

[timid dove]

how?

Can you show code?

[frail kelp]

its visual script

[timid dove]

If you're setting the velocity directly in your code or something, especially every frame, then the damping isn't going to do anything really

[timid dove]

yeah damping isn't going to affect you then

Honestly I wouldn't futz around with area effectors

[frail kelp]

Really? I tried applying drag to the rigid body itself and it slowed down the movement, so I thought damping would work as well

[timid dove]

depends if you're setting velocity every frame or what

[frail kelp]

Velocity is being set every frame. Why does adding linear drag here work, but adding it with damping doesnt?

[frail kelp]

Whys that?

[timid dove]

would be simpler to just use a trigger collider and have it change the velocity in your code

[frail kelp]

Like change the velocity determination to factor in what its walking over? That sounds like it wouldnt work well if I have multiple things I want affected by the terrain

[timid dove]

why wouldn't it work well with multiple things affected by the terrain?

[frail kelp]

Wouldnt you have to do something like... when you want something to move, you multiply by a speed factor to see how much it moves. So when youre colliding with the slow down effect, you modify that speed factor but also need to revert it when they exit. That seems like ti could get messy

Oh and im not sure if thats easily editable with NavMesh pathfinding speed

[timid dove]

not really you could have something super simple like this:

float normalSpeed = 50;

void FixedUpdate() {
    if (myCollider.OverlapCollider(filter, results)) {
      currentSpeed = results[0].GetComponent<SpecialTerrain>().GetWalkingSpeed();
    }
    else {
      currentSpeed = normalSpeed;
    }
}```

that's pretty simplified but... easy

then you have these colliders around with that SpecialTerrain component on them, which tells you what your speed should be when walking on it

could be a multiplier instead too

up to you

[frail kelp]

hm

[vague mango]

I'm sorry if this is the wrong channel to post this in. I'm new to this discord. I am working on a team and we want to use Dynamic Bone on some of our assets. I've been playing around with it for some time and I can't seem to get the gravity to work on the object. I was wondering if anyone had experience using Dynamic Bone and wouldn't mind me asking you a few questions. Thank you in advance 😄

[iron lava]

rb.AddForce(Vector3.up * (Phys_WaterHeight - transform.position.y) * rb.mass * 40, ForceMode.Force);
rb.AddTorque(((transform.right * -transform.rotation.x) + (transform.forward * -transform.rotation.z)) * rb.mass, ForceMode.Acceleration);

This is the code I made for bouyancy, and it works! but for some reason, if I apply this force in any direction other than 0:

rb.AddTorque(transform.right * -Vehicle_Input.y * 0.25f, ForceMode.Acceleration);

It starts to rotate faster and faster until it rotates to a point roughly north. My mass is 50 and nothing else happens. Any tips?

[upbeat birch]

Um, in what situation a RaycastHit.triangleIndex can be -1 for a MeshCollider hit?

[bleak umbra]

when it didn't hit a mesh collider

since a RaycastHit is a struct, the index will always have a value (0 by default), which makes no sense if the struct represents a non-hit, hence -1 is used to denote an invalid hit or a situation where the concept of a hit triangle is undefined (all colliders that aren't mesh colliders)

[upbeat birch]

But it hit the collider, identified it as a MeshCollider and returned a correct point on the surface. 👀

Seems it has something to do with Convex flag, but I don't know why. I assume that if the engine found a contact point on a MeshCollider and this MeshCollider has a positive triangles count, there is no reason not to have a triangleIndex value.

[timid dove]

Convex colliders don't use the original mesh

They build a new convex mesh and use that

So the triangle mapping to the original mesh will be broken

[upbeat birch]

Huh. Thanks for the clarification! Is the usage Convex option more common compared to a usage of an original/separate mesh?

[timid dove]

you have to use convex if the collider is on a dynamic rigidbody

and convex colliders are somewhat more performant in general

I can't/won't make a judgement on how common one or the other is

they have different uses for different requirements

[upbeat birch]

You mean they are more performant comparing to an original mesh or because the engine constructs them in an optimal way?

[timid dove]

The general algorithm for detecting collisions with a convex mesh is much simpler and faster than for a concave mesh

[upbeat birch]

Oh, Unity does not provide acces to the convex hull that PhyX generates for the collider. Now it makes sense that I got -1 as a triangle index with Convex flag. 💡

[real flame]

I'm new-ish to doing 3d collision, but am helping my kids with something.

Should rigidbody and collider components be added to the game object or the model under it?

[topaz flare]

Doesn't matter (unless you use mesh collider), organisation preference, although if you set the collider on a mesh, you get the benefit of automatic resize according to the mesh dimensions

[real flame]

Yeah we're doing some less simple objects we imported from CAD, and are using convex mesh

[topaz flare]

in that case yeah, put it on the model

Unsure about the rigidbody though, I believe if you put it with the model under the gameobject, the model will move independently from the gameobject

[stuck bay]

can someone please help me fix this my 2d sprite is going trough my floor

[timid dove]

you'd have to explain your setup

[stuck bay]

pretty simpel really

[timid dove]

why do you have a script without a name

also what components does the platform have

and what does your code look like

[stuck bay]

I dont have any scripts?

[unique cave]

Aand why is there rigidbody but no collider?

[stuck bay]

I FORGOT ABOUT THAT

[timid dove]

there's a script under the Rigidbody2D

[stuck bay]

Thx ik kinda new

[timid dove]

and yeh no collider

[timid dove]

yeah delete that

[stuck bay]

thx

it works now

but what does a rigidbody do i tought it did what a box colider does

[timid dove]

Rigidbodies are the basic unit of physically simulated objects. If you want something to move, be affected by gravity and forces and things knocking into it, it needs a Rigidbody.

Colliders define the physical shapes of physics objects, including Rigidbodies. A Rigidbody without a collider has no physical shape or structure.

[stuck bay]

ohhhh

so bascily

colliders are the body

and rigibodes is the logic

[timid dove]

Doesn't feel like a perfect analogy to me, but if that makes it easier for you

[crimson jetty]

Here's a strange question: is there a recommended way to have a character controller push other rigidbodies out of the way when colliding? Right now they're stopping the controller which is not what I want... I'm thinking of adding a second collider with a layer mask but not sure if that would help.. Thanks! I don't need the other rbs to stop the collider, they can just be flung out of the way

[tender gulch]

I think CC has it's own on collision events in which you could apply force to the collided objects.

[timid dove]

https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnControllerColliderHit.html

also "other" rigidbodies doesn't make sense since the CC is not one

You may be better off using something like this:
https://assetstore.unity.com/packages/tools/physics/kinematic-character-controller-99131

[mighty bobcat]

anyone any idea why this raycast wont his this object?

[timid dove]

"this raycast" being?

[mighty bobcat]

i fixed it by making a 3d collider on a 2d object

[timid dove]

Are you sure you didn't just want to do a 2D raycast?

Using a 3D collider means you're basically now dedicated to using the 3D physics engine for your whole game

You sure you want that?

[mighty bobcat]

Yes I realised i was shooting the Ray on the wrong axis 🤣

[upbeat elbow]

hello my humanoid that I have downloaded from mixamo is shown out of its capsule and also just floating in the air... any suggestions?

no scripts or excessive settings were used

[nova tangle]

Hoping someone can help me with spring joints.

I am making something that hangs and uses physics-interactions using a springjoint. My issue is just that even though i am setting the min and max distance, it doesn't help on the fact that the resting length of the springjoint is much larger than i wanted.

Is there no way to set the maximum distance from the connected body?

[timid dove]

First check where the object's pivot is

if the model is detached from the pivot, you need to fix it in 3D modelling software, or find a better download

Highly likely the collider is just offset though

"its capsule" < the capsule is not related to the model in any way

[upbeat elbow]

I assume the pivot should be on the model so its fine

although the model just floats even if there is no floor, walking animation is running on the same axis as the model is placed and the model itself doesnt fall or collide with boxes

also what I noticed is that when I try to record an animation the model returns to its "capsule" in sort of "falling" position (do you mind telling the name of it so I can google about it?)

[rotund lagoon]

What's the best way to check if any part of one object is visible to another object? For example if the object is partially behind something then raycasting might hit the partially blockage

[rotund lagoon]

Currently the best way I can think to do it, is to cast a grid of rays; so for example cast 9 rays at the object. And if any hit the object then we can see it. For more accurate results increase the number of rays in the grid.

[timid dove]

Why assume when you can check?

[timid dove]

Make sure your tool handle position is set to Pivot and not Center

[timid dove]

Basically this, yeah. Though not really a grid. Make some empty child objects on the target object and do a LineCast to each one.

[honest granite]

bending over allows players to look through a wall, any way to fix it? the whole upper part of the player with the gun glitches trough when the player bends over, looks down(using character controller)

[timid dove]

maybe make the CC radius correspondingly larger when bending?

[thin gale]

How costly is colliders?

I know that some colliders are more expensive etc, but say a sphere/capsule

[timid dove]

Depends on the scene, your physics settings, what kinds of physics queries and interactions are happening, the collider shapes themselves, etc...

there's a lot of variables that go into it

your best bet is to profile the game on your target hardware and see how it performs

[thin gale]

okay, for my purpose its just so that my character dont walk through bushes etc

[timid dove]

Don't worry about it

[thin gale]

disabled colliders dont take power i guess?

i could maybe have a collider only on my LOD0

or disable them when not next to em

im on mobile btw, thats why im picky and thinking abt my performance

@timid dove appreciate the input

[timid dove]

Sure but we can't make some blanket statement like "colliders are costly". They are really not. In fact the physics engines are extremely optimized and unless you have thousands of colliders and hundreds of Rigidbodies physics are unlikely to be a performance bottleneck for you

Your best bet is profile your game, see which things are the costliest, and focus your efforts there.

[thin gale]

yeah! alright thx

[sour heath]

Hey guys, how do I make it so that my object doesnt flop around when i move it? The floor is a non convex mesh collider, and the object is a convex mesh collider, with no kinematic because if it is kinematic, then it falls through the floor.

[dry island]

Hello, how can I change the angular X and YZ drive of a configurable joint? When I try changing the position spring it says

Error    CS1612    Cannot modify the return value of 
'ConfigurableJoint.angularXDrive' because it is not a variable

[timid dove]

You have to set the whole struct at once

Same as how transform.position works

[dry island]

Like this?

JointDrive drive = new JointDrive();
drive.positionSpring = 20f;
drive.mode = JointDriveMode.Position;
joint.angularXDrive = drive;
joint.angularYZDrive = drive;

[timid dove]

I'd just copy the existing one from the joint rather than creating a new one

[dry island]

How could I do that? (Sorry I'm a beginner)

[sour heath]

Hey so

when I hold down a key, lets say w to move forward, it doesnt fall, aka gravity does not work when i hold down a key to move my object in unity

how can i solve this?

[gleaming gorge]

Depends on how you move it? If you are setting velocity, then it most likely won't fall since the gravity get overwritten by your velocity

[timid dove]

With the = operator.

[viral beacon]

is there a way to make a rigidbody with a mesh collider always slightly clip through the surface its touching so torque can be applied without interruption?

[timid dove]

can you provide some context?

[viral beacon]

I want to make physically present wheels, and currently my only means of doing that is with a sphere collider. Because I would like to have more accurate collisions I wish to use some kind of cylinder mesh, but a common issue I run into is a dramatic amount of bouncing and skipping as a result of the flat faces, which makes acceleration inconsistent and causes a lot of physics-defying launches.

[timid dove]

Have you looked into WheelColliders at all?

They were designed for realistic wheel physics

[viral beacon]

they only handle collisions at a single point

and a stray gust of wind can send them clipping through the floor

[twin nebula]

Does anyone know how you would connect a rigidbody to another rigidbody but have it sort of not change the rotation of the other one?

Its hard to explain let me give an example

So there's a cube with its rotation locked and a ball underneath it which is attached with a joint

How could I make the joint attach it with position only and not the rotation?

So if the ball spins it will actually spin and not try to rotate the cube with it because they're connected

That's still kind of bad

[timid dove]

use a hingeJoint or other joint that allows for rotation

[twin nebula]

Trying to do it with a Config Joint

Just trying to see how I would do it

[timid dove]

Can you maybe draw a diagram of what you're trying to achieve?

[twin nebula]

I'll try but I'm awful at drawing lol

I want them to move together but not rotate together if you get what I mean

@timid dove

[timid dove]

so wouldn't you just put a hinge joint on the ball - with the axis set to the ball's z axis, and connected to the box?

no spring

no motor

no limits

[twin nebula]

I'll give it a shot

[twin nebula]

Yep that worked. I'm an absolute idiot. Thanks lol

[viral beacon]

is it possible to make a rigidbody send but not recieve forces from the environment?

[viral beacon]

nvm I figured it out

[vague smelt]

if i lower solver frequency on cloth physics will it make it run faster?

are there any other ways of lowering performance cost for cloths

[timid dove]

not so much faster but less frequently...

[turbid geyser]

Quick question:
If I have an immobile trigger that is being passed over by another object because its going too fast, how I can I prevent that?

If it were mobile I'd set its "Collision Detection" to "Continuous" (which my mobile object is set too)--but I'm unsure how to handle this when it is immobile.

[turbid geyser]

In case it matters, this is 2D

[timid dove]

collision detection mode is:

• not going to exist for a static collider anyway (it's part of Rigidbody)
• not really relevant for the object that is not moving
• not really taken into account for triggers.

You can do manual ray/sphere/box/capsulecasting (Or RB.SweepTest) with the moving object to see if you'll intersect it during the next physics update.

[night pecan]

guys

I am doing a hit test and once I hit something I delete the object and continue hit test but I am keep hitting the same object I just deleted

my code is like
AllColliders = HitTestAtPointAndReturnAllColliders(523,23,1);
Delete(AllColliders);
AllColliders = HitTestAtPointAndReturnAllColliders(523,23,1);
//AllColliders is the same as previous colliders that I just deleted

[timid dove]

Well that code is not really decipherable... but I imagine your problem has to do with:

1. Unity's Destroy doesn't actually happen until the end of the frame
2. The physics scene does't actually get updated until the physics simulation step, or a manual call to Physics.SyncTransforms

though you didn't actually explain what the heck HitTest is or how Delete is implemented

[night pecan]

I believe you are right

as I SLOWOOOOOOLY call each individual detect-delete, it doesn't experience the problem I described

I fixed my issue by making sure "end of frame" is reached at least once AND "a physics sim step" is finished between each hittest-and-delete calls

[timid dove]

you can also just immediately disable the colliders

and.or deactivate the objects

then you won't have to wait for the frame to end

[night pecan]

I have failed in doing so

How do I immediately disable the collider AND remove a gameObject from Unity's scope

Making the gameobject that has the colliding collider inactive doesn't seem to get applied immediately even with usage of Physics.SyncTransforms

wait

wait maybe I can fix this wait

wait wait wait!

YES IT DOES WORK

YESSSS

the problem was the human error:
The editor of the code believed that he/she/it wrote Physics.SyncTransforms but
the human being did not write Physics.SyncTransforms at certain sections

[hollow echo]

what do you mean? Also, 'they' is a fine singular pronoun

[night pecan]

I thought I called Physics.Sync

I didn't

I am awkward sometimes

sorry

[stuck bay]

Hello! I believe I talked about physics in the unity general channel which may have been the wrong place to do so, I will post a screenshot here, if someone can look at my issue i'd be glad, I believe it to be a... huge problem honestly

[half creek]

hello! I'm having an issue with inaccurate collisions and it seems like a good place to ask for help. Bullet objects (with a box collider 2d set as triggers) often end up half way in walls while my intention is to make them stop during the very first impact. Collision detection is set to "continuous" and I changed Fixed Timestep stat in project "Time" settings to 0.01. I also use OnTriggerEnter2D as the method to set projectile's speed to 0. Do you maybe know what might be causing this or have some tips to improve the collision quality with relatively low performance impact?

[prime flower]

whats your physics timestep set at?

[timid dove]

This is how triggers work. They don't do the kind of interframe collision checking as non triggers. They just check for overlap each frame

You could do BoxCasting in FixedUpdate if you want to improve it.

Or - when you get the OnTriggerEnter2D, maybe check the previous frame's position, do a boxcast from there, and reposition yourself right outside the wall?

[half creek]

isn't it Fixed Timestep (at least that is what google told me)? If yes then it's set to 0.01

[half creek]

alright, thanks for explaining! I will try out your ideas and see how it goes

[prime flower]

That’s kinda low imo

[half creek]

yeah, I changed it for testing purposes, probably will change it back to 0.02 (default value) or even higher if it won't affect the gameplay too much

[prime flower]

sorry i misread and thought you had it set to 0.1

I usually go with something that 60hz fits into

30/60/120hz physics

[noble zodiac]

How good of an idea would mesh colliders on ragdolls be? Assuming its possible.

[timid dove]

It's not a good idea nor really possible

You'd have to update the mesh every frame to match the pose, which is prohibitively expensive

It'd also be a concave mesh which has lots of physics limitations

[noble zodiac]

I was looking at games like blade and sorcery and boneworks having no idea how the colliders on all the bodies work. I mean, it cant just be a normal ragdoll since you can stab any part of the mesh having 0 gaps

[noble zodiac]

I recon I'll be fine with updating the mesh. I could have it use basic colliders like capsules and boxes while precise colliders are not needed. Also I should probably have a lower poly version of the body in same pose as the high poly to use for precise colliders. Dunno I'll test some stuff.

[deep rain]

@noble zodiac they are basically just tons of hitboxes consisting of spheres and capsules, and sometimes boxes

the gaps you have in traditional ragdolls are really veeery small and if for some reason you would need more accurate ones then having a set of non-selfcolliding spheres for joints would probably work

[timid dove]

not only would that work but it'd make it a lot easier to do things like detect when a particular joint was hit and detach limbs etc..

Using a MeshCollider good luck determining what part of the body has been hit by anything. You'd have to do something like take the textureCoord of the hit and have some kind of UV mapping to body parts somewhere.

[rancid tiger]

Hey guys

trying to figure out why this collider i put on the face isn't moving with the face
just kinda stays there
or like what I need to do to get a collider that moves with the model lol

it is for a VRM model

[timid dove]

you need to attach colliders to the bone transforms in the hierarchy.

[rancid tiger]

so perhaps I should just make an object within the bone structure, I'll try to do that

and then apply that VRM sping bone collider group script to it

oh i think I can add that script directly to the bone

beautiful, thanks, that worked

[ocean palm]

hey guys i downloaded this asset pack (https://www.kenney.nl/assets/marble-kit), import into my project, grab one of the corner track pieces, add mesh collider + make concave, add rigidbody, but then when i add my ball, even though it collides with the piece, the piece just acts like a big block? like the ball doesn't roll down the track in the middle, just seems to coast on top of it instead? (also not sure where else to post this question, sorry please let me know if not appropriate for this area)

[timid dove]

sounds like you marked the collider as convex

which is the opposite of concave

[ocean palm]

right but if i don't do that, it just doesn't collide at all? the ball passes straight through?

[timid dove]

remove the Rigidbody from the track piece. Make sure it has a MeshCollider not marked convex.

make sure the ball has Rigidbody that is not kinematic, and a SphereCollider. For good measure use continuous collision detection on the ball's RB

[ocean palm]

omg thank you that works lol! i thought you needed a rigidbody to have any kind of collision at all for some reason but now i think i get what's going on - the collider is the actual collider (duh), and the rigidbody just grants physics properties

[timid dove]

Colliders provide collision - Rigidbody provides velocity/forces/mass/torque etc. Yeah you got it

[zenith fox]

why does unity think the small collider under the player is touching the planet

i have a variable that tracks the amount of collisions and in this moment (i paused the game) it is at 1

also it only considers objects tagged as "Ground"

[timid dove]

You should print the name of the object it's touching, just to make extra sure it's the ground

[zenith fox]

it is printing "Planet"

which is indeed the planet

[timid dove]

how zoomed in are we here? What's the approximate distance in units between the player's feet and the planet

also what kind of collider is the planet made of

[zenith fox]

let me see

3~ units

[zenith fox]

circle collider

[paper basalt]

Why is the bullet spawner pivoting around and not just moving with the parent?

[timid dove]

it is moving with the parent

you jsut have tool rotation set to global

no?

nvm it's on local

it'd be due to your script then

[paper basalt]

ah ok thanks

[rancid tiger]

nice name : )

[paper basalt]

Thanks

[nocturne schooner]

hi i hope this is the right channel!
i'm having an issue with springbones, they don't move with the rest of the object when in play mode, and i'm getting these error messages (not sure what they mean as i'm not unity-literate)

[torpid basin]

Hey guys, I'm working on implementing my own simple physics engine.
I'm currently using casts (ray, box, sphere etc) to determine collisions.
This works when a moving object colliders with a stationary object. However when two moving objects attempt to occupy the same empty space, they end up inside each other, since their respective cast told them the space was empty.

My question is: How do physics engines normally handle this? And would anyone have any ideas on how I could attempt to handle it?

[timid dove]

They rely on depenetrating objects that ended up inside one another

In fact when you use Unity's built in physics, if you use Discrete collision detection, it doesn't do any pre-emptive raycasting at all

it's all just depenetration

[torpid basin]

Very interesting. Does anything penetrate for 1 frame before being depend in the following frame?
Or is it all calculated in a single frame such that no pen ever visibly occurs?

[timid dove]

If you're using the physics engine properly then you should never see penetration visibly

If you do something like moving objects outside of the physics engine (e.g. moving Transforms directly), you will see them penetrate until the physics engine gets around to simulating, at which time they'll depenetrate

[torpid basin]

Fantastic, thank you very much for this

I will attempt to implement a similar system(:

[timid dove]

This may be helpful https://docs.nvidia.com/gameworks/content/gameworkslibrary/physx/guide/Manual/GeometryQueries.html#penetration-depth

note that PhysX is also open source so if you dig around you can find the source code for how it does this stuff too

My point is a similar function may be useful for you to create 😛

[torpid basin]

I see; an excellent resource! Thank you:D

[stuck bay]

hmmm, currently if my ragdolls fall from a big height they go all jellified for a few moments before settling when they hit the ground, anyone know how to counter that? is it the velocity doing it and I should clamp it?

[gusty cave]

does anyone know why my raycast's do not register a hit with a non-convex mesh collider

[warm basin]

can anyone help me with my wall and player bounce off each other and not standing still while moving horizontally across the wall

[torpid basin]

@warm basin Maybe, I've had similar problems. Care to elaborate?

Hey guys.
Currently getting enormous results for direction and distance outs when using Physics.ComputePenetration
Anyone have any thoughts on this?

[bleak umbra]

Are they negative? Are your objects large? Are you viewing them in scientific notation?

[torpid basin]

sometimes, no and no.
Thank you for the response! But I think I discovered the problem was that sometimes the objects weren't actually overlapping

@timid dove Thank you for the information about Depenetration! I've just successfully implemented it into my physics system(:

[noble zodiac]

Is there a way to have Rigidbody use collider from child? Or at all a way to specify a collider that Rigidbody should use?

[bleak umbra]

it will use all of them unless you exclude their interaction via layers & the physics matrix

[noble zodiac]

It appears so. I just had some other stuffed messed up so thats why it didnt work

[drowsy copper]

how do i make a rigidbody 2d work with a tilemap collider?

[timid dove]

"work with" in what way?

If you want the player to collide with other colliders you give it a collider of its own

[drowsy copper]

my tilemap has a tilemap collider 2d and my player has a rigid body 2d

theres also a composite collider 2d in the tilemap

my player just falls through the ground

[timid dove]

As I said

the player needs a collider if you want it to collide with stuff

[drowsy copper]

what kind of collider

[timid dove]

any 2d collider you want

[drowsy copper]

i tried a box collider but it didnt work

[timid dove]

did you try a BoxCollider2D?

[drowsy copper]

yeah

[timid dove]

you did something wrong

try it again

Also show the inspectors of both objects you expect to collide

[urban geyser]

I have a quick question, let say I have a cube collider with another object, a terrain, but half of the cube is touching the terrain, how can I know how much of it is colliding?

[timid dove]

and make sure you're not moving your character in a non-physics friendly way

[timid dove]

there's no built in way

[drowsy copper]

this is the tile map

this is the player

[urban geyser]

Okay well thanks anyway

[timid dove]

looks fine although it's odd that your player has a Tilemap

[drowsy copper]

oh wait

i dont remember adding that

[timid dove]

turn on gizmos and make sure the colliders are actually in the right places

[urban geyser]

Okay well I got an idea I will put 2 colliders on my track and if both are colliding its maximum grip if not its half

[drowsy copper]

the colliders look right

how do i turn on gizmos

[timid dove]

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

[drowsy copper]

i fixed it

thanks for the help

[warm basin]

@torpid basin I think I figured it out you have to use velocity instead of simple horazontal, and vertical

[urban geyser]

I have my collider attached to an object that has a rigidbody parent but the collider doesnt detect collisions

[timid dove]

what exact behavior are you looking for when you say "detect collisions"?

[vagrant pecan]

Hey so I'm using a Point Effector 2D to attract my player to a specific rigidbody, but for some reason, it only brings the player to the same vertical height as the point it's supposed to be attracted towards, and barely moves it at all horizontally. I was wondering if anybody knows why it does this, or how to fix it.

[timid dove]

does your player have code setting its velocity every frame or something

[vagrant pecan]

oh

thanks i completely forgot to check if that was the cause

[white portal]

is there a way to stop my character from getting caught on the vertices of polygonal colliders?

[timid dove]

use composite collider

or wait are you asking about the.. cloudy part?

What do you want to happen there?

[white portal]

on the character or the cloudy bit

[timid dove]

on the environment

[white portal]

so the cloud has an ovular collider

and my character gets caught when walking over

i want him to be able to smoothly walk over it

[valid warren]

I used a 2d PolyGram collider to draw around the edge of a GO but I wanted it to block the character from going outside the GO rather than the inside

[timid dove]

use an EdgeCollider2D instead

[valid warren]

Thank you!

[graceful cove]

Do you want him to walk without touching it? If so, you need to look over the project settings and disable the collision

[terse chasm]

Hey, so I've more or less exhausted the obvious routes to take when looking up tutorials/docs on how I can exactly accomplish this, but I've been trying to figure out how to do something like this https://streamable.com/anpn0

(Sorry if its the wrong channel for this btw)

What I want is something just like this, where a Z axis is simulated convincingly enough in a 3/4 top down view. If anyone has any pointers to where I could learn more or what I could research that would steer me in the right direction that would be greatly appreciated.

What's important is the jumping and wall collisions btw, I've already gotten the gist of walking on a 2d space like this.

[timid dove]

One way is to simply use 3D physics and 2D art

[white portal]

I want him to walk on the curved collider without getting stuck

About 10% of the time he'll get stuck on the vertices of a triangle. It looks like the collider is made of triangles

[graceful cove]

You can use a capsule collider instead of a box collider.

That's what most people do usually.

[white portal]

On my character?

[graceful cove]

Yep

Or you can draw a collider with polygon collider that looks like that :

The most important part is the bottom.

[white portal]

okie dokie. i'll give the capsule a shot firstand see what happens. thanks!

[terse chasm]

I think a solution Ive found from looking at threads of other people having this problem, I think simulation a Z axis in an integer attached to the player that dictates whether certain walls are colidable and what floors can be stood on

[strong hedge]

https://streamable.com/923suo

https://streamable.com/vn7loi

😂

[light cradle]

hey i am working on a 2D top down game and i want to do Rigidbody2D.AddForce but my player then flies infinitely, how do i solve this (gravity in a top down game?)

[timid dove]

it will keep accelerating as long as you keep adding force

[light cradle]

i only add force once but there is no gravity to stop it? i think that's the problem idk

[timid dove]

Do you know basic physics

[light cradle]

yes. and this sentence doesnt help anyone

[timid dove]

Well if you know basic physics it's not a mystery why applying a force to something makes it move forever, barring other outside forces.

[light cradle]

ik? thats what i mean

[rancid tiger]

hey guys!

how would you go about fixing this issue, I'm stumped, my brain is fried trying to think of a solution

I don't want her arms to pop out of the red drape there

[unique cave]

It seems those "sticks" (green ones) are not connected together in any apparent way. You could add some joints there (blue ones)

[rancid tiger]

Of seriously? I can add joints like that?

can they stretch though?

I'll give it a try I suppose, I can do this in blender?

[rancid tiger]

thank you for the idea, i kept thinking of doing something sideways like that but, I didn't think it would be possible, if you're saying it is I'll take a 2nd look at it... I wonder how I could make "joints".

I'm going to bed but if you've got any other hints for me please let me know, going to be working on this all day tomorrow probably

[peak cloak]

how can I make a wire thing that goes from one white circle to the other

found how

[light gust]

How do i stop a caracter from beeing able to push an enemy in 2d uniy? @ me if u can help please

[unique cave]

No you cant. How did you make the cloth? Is that unitys default cloth component? I thought you did use joints already to make the cloth

[rancid tiger]

It's VRM Spring Bones, not cloth component.

how can I make joints in Unity? I suppose I'll google that

[trail iris]

Hey everyone, does anyone know why physicsene.simulate on a 2D physics scene will not simulate 2d physics in that scene but instead will simulate 3D physics in all other scenes?

[timid dove]

https://docs.unity3d.com/2020.1/Documentation/ScriptReference/PhysicsScene2D.Simulate.html

There's a 2D version

[trail iris]

Yeah thats what i did, I made a physics scene of type 2D and i ran simulate on that

[timid dove]

It should only simulate the one you call simulate on

Maybe show your code?

[trail iris]

But its simulating everything besides that scene

Sure one sec

[trail iris]

Scene newScene = SceneManager.CreateScene("physicsScene", new CreateSceneParameters(LocalPhysicsMode.Physics2D));
PhysicsScene physicsScene = newScene.GetPhysicsScene();

//add some stuff to it
physicsScene.Simulate(1f);

and i simulate the physics scene in a corutine of yield real time

what it does now is it simulate all the 3d stuff in my main scene, and does nothing to whatever I add to it

[timid dove]

https://docs.unity3d.com/ScriptReference/PhysicsSceneExtensions2D.GetPhysicsScene2D.html

You need to get the 2D physics scene

Right now you're getting the "global" 3D pysics scene because that scene doesn't have its own 3D physics scene and you're asking for its 3D physics scene

Should've been a big tipoff that you have a PhysicsScene not a PhysicsScene2D

[trail iris]

Oh yikes that might be the reason

Let me try it out

Was mindbogged by the behavior

But i did a scene validation of type 2d and it says its valid

Weird

[timid dove]

wdym

yeah the scene is valid

ofc it is

you just made it

[trail iris]

omg it's moving, finally

[trail iris]

thanks man! Was stuck on it for forever

[noble zodiac]

Would mesh collider be better in terms of performance in this situation or would primitives still win? Lets imagine that we have mesh collider with n amount of faces and something else with the same n amount of box colliders. The position for each face will update every frame and the position of each box will update every frame. Both have rigidbody on them, so mesh collider will be set to also convex. This is probably a very weird question.

[slim olive]

I'm using a character controller and it won't collide with other object when calling charactercontroller.move

but I want to recieve oncolliderenter() callbacks

what's the alternate solution?

nvm I was supposed to use oncontrollercolliderhit()

[valid warren]

Can anyone explain why the boatObj behaves in this way? as it nears 180 in either direction it slows until it stops at 180

[timid dove]

Presumably due to your code

[valid warren]

            if (drivingBoat)
            {
                playerObj.GetComponent<wasdMovemnt>().enabled = false;
                Vector3 pos = boatObj.GetComponent<Transform>().position;
                playerLock.enabled = true;
                if (Input.GetKey(KeyCode.W))
                {
                    pos.y += movementSpeed;
                }
                if (Input.GetKey(KeyCode.S))
                {
                    pos.y -= movementSpeed;
                }
                if (Input.GetKey(KeyCode.A))
                {
                    rotation.z += rotationSpeed;
                }
                if (Input.GetKey(KeyCode.D))
                {
                    rotation.z -= rotationSpeed;
                }
                boatObj.GetComponent<Transform>().position = pos;
                boatObj.GetComponent<Transform>().rotation = rotation;
            }

this is the code controlling the boat

[viral ginkgo]

@valid warren dont use rotation.z

Use transform.Rotate or something

[rustic parrot]

Hello, is there a way for a GameObject with a collider and without a rigidbody to get blocked by another GameObject who this one have a collider and a rigidbody ?

I'm instantiating a lot of gameobject with only a collider so i would like to dodge the rigidbody component since it's heavy on performance, thanks

[bleak umbra]

you can only simulate collision responses (forces caused by a collision) if you add a rigidbody to the objects you wish to be so affected. You can ofc detect the collision and do the handling of any response to it in custom code, without a rigidbody, which could make sense if your custom handling is significantly less complex or substantially different from the default handling.

[rustic parrot]

I see Aniki thanks for the information, guess i should code it then because when i put rigidbody on the hundred of prefabs i'm instanciating it goes from 60fps to 30fps

[bleak umbra]

it will go down even more if you custom-code it unless you have a good reason to believe why your custom solution will be faster

the best strategy to improve physics performance is to avoid unnecessary collisions (by setting up physics layers)

[rustic parrot]

Well i don't know what to do a ctually

[rustic parrot]

seems like something i can do

If you want to visualize : https://www.youtube.com/watch?v=qZk7fAq8TuA

i just want for the enemy sprite to detect walls when the 3D environment and props will be there, for the moment they just have a sphere collider

[raw lance]

Added a skinned mesh renderer model to my player character, and a mesh collider to the parent object, but now the player object falls through the world. Am I missing a component?

[unique cave]

Do you get errors? You cant use non convex mesh colliders with dynamic rigidbody. Dynamically changing the shape of a mesh collider is not gonna work, using compound colliders is the industry standard for character colliders

[timid dove]

yeah the collider would need to be conve which probably defeats the purpose. What AleksiH said is the way

besides even if a concave MeshCollider worked at all you still wouldn't be able to deform it with the animations of the character

[raw lance]

Ah so use multiple different shaped colliders

[timid dove]

Most of the time you build an animated character's collider out of primitives. Capsules, spheres, boxes.

Convex mesh colliders are allowed too but are not as performant.

[terse chasm]

Am I massively overthinking things. As part of a character animation, a child element of the parent Player does an animation and I want that child rigidbody to transform up by a certain measured amount. Everywhere I look it seems you have to work with a Vector2 and do some multiplications. Is there a way to just say something like "position.y += 20" in simpler terms

[wide nebula]

No, you cannot modify a single axis of the transform of an object.

[terse chasm]

https://www.youtube.com/watch?v=GtX1p4cwYOc knowing that, and after watching this, I think I get a better idea of how things work. Say I wanted to make a sliding block that the player can push. Instead of having the block slide X amount, it would transform towards a sibling point object. Does that sound right?

[wide nebula]

I'm not going to watch that. If you want to push something without using physics, you can just move it in the direction the player is moving.

[terse chasm]

I wasn't begging you to watch it but thanks otherwise

[cedar jay]

are colliders a part of the physics? I suppose 😅 so here's a question:
is it okay if I setup a custom collider this way? (better to say multiply colliders, because there are 20 convex parts)
should I also somehow disable the usage of the colliders for lod1-4?

[timid dove]

What are we looking at exactly? Which objects have collider(s) on them?

I would say for an LODGroup, that physics should not generally be part of that, just Renderers. The colliders should be on a separate object which doesn't change. It kinda seems like you've done that here but hard to tell

[cedar jay]

This is a rock prefab with 4 lods and a mesh collider, which consists of 20 convex parts
I just didn't know how to parent (?) the imported colliders to the main rock prefab 🤔 couldn't find much info on internet either and figured out this way, but wasn't sure

[timid dove]

right click the BIG_desert_rock_08_colliders thing here and go to Prefab -> Unpack Completely

Then you can freely move its child objects around as you wish

does that help?

[cedar jay]

Wait wait wait, I think I didn't ask the question in a right way

The prefab (rock + its lods) was created/packed in unity.
I imported the colliders as a separate mesh.
I added the colliders prefab to the rock prefab.
Applied mesh collider to the imported collider meshes.

Is this way of setting up a custom collision correct?

Since I cannot apply a mesh collider to the rock mesh itself due to its complex shape with multiple concavities

[timid dove]

Yeah nothing wrong with that

sorry wasn't sure what you were asking

[cedar jay]

My bad 😅 should have written step by step at the first time
Thank you for your help!

[umbral galleon]

Pls i need a vehicle drifting controller for my car model in unity

[wide nebula]

This isn't the place to ask for free handouts. Do some research, make an effort, and ask questions here.

[narrow sigil]

how to make seesaw like platform?

[timid dove]

hinge joint

[narrow sigil]

i tried, but not updating collision position

[narrow sigil]

got somthing working, ty

[prime flower]

any physics experts here?

I'm wondering if there's a way to stop a ball from bouncing as it rolls over the segment where 2 physics meshes join

I have a Unity Terrain Collider that I'm trying to "stitch" a separate physics mesh to

I know it's a common problem

Oh wow it was just the Default Contact Offset...

[verbal aurora]

Hi guys.
I'm trying to create a VR drums simulation game in Unity.
I set up rigidbody and colliders on both hands (stick models) and drum parts, I managed to get a sound upon hitting, although there is no "physical" collision between those two, it behaves like sticks would have no physical models, just like a ghost it just goes through the drum.
I'd love to enhance it with the physical "touch" and some vibrations upon hitting, is there any solution to this? I would be really thankful for help, because I'm struggling to get this work for a few days, I watched a lot of tutorials, did everything step by step but I just can't make it work.
I experimented with a lot of setups - changed colliders, rigidbodies, gravity or kinetic. What could I be doing wrong?

[loud drift]

please, help! any idea if it is possible to combine multiple PhysicsScene into a single one?

[rich totem]

how can i do a simple ragdoll for this creatue

i guess it has something to do with character joints

i cant do a humanoid ragdoll , cuz there are legs missing pelvis...

[timid dove]

Look into Articulation Bodies / articulations instead IMO:
https://docs.unity3d.com/Manual/physics-articulations.html

[lofty coral]

I have an Ai thats patrolling around a surface. I want it to be able to see things with an RayCast but the raycast is wider than just a dot in the middle. I want the ray to be like a horizontal line so that the Ai can see further to the sides than just the middle. any ideas how i could make this happen?

[timid dove]

use a BoxCast

or SphereCast

Or CapsuleCast 😉

[pure mist]

Is this room only for Legacy physics or do you guys deal with DOTS physics as well?

[narrow sigil]

for the config Joints, how do i slow the return position so i can continue to run up the ramp quickly? so it returns slowly so i got time https://gyazo.com/6685f68d5d7f266f4a18801f8c3ce70b

[unique cave]

Increasing the mass should do the trick

[narrow sigil]

If I increase mass, the platform won't rotate all the way

[unique cave]

Make the spring weaker then

You can also use the motor via c# script to have more control over it but id not if controlling the spring and mass (of the player/platform) is enough

[lean hamlet]

I am studying a little bit of constrains.
I have an object B paired to object A
If object A moves position, object B moves with it, however i don’t want to rotate object B if object A rotates.
How do I set up this?

[jolly vigil]

This is really basic shit, I'm new. But, I'm trying to make a basic 3d game. I have the terrain, got the camera movement, character movement. All works fine, but if my character hits the ground too fast it will simply just fall through the floor. How do I fix this?

[unique cave]

How are you moving the character? If using rigidbody, change the collision detection mode to continuous

[gritty isle]

i want an object to bounce of walls only if is impacting at high speed, i have tried like this and by checking the speed on the collision but on both ways the velocity go to zero before bouncing of the wall so it doesnt works, how can i capture the speed before the impact without doing it resource heavy? i have some ideas but i think they might be to heavy

[narrow sigil]

i see so many spring options, which ones? they wont go negative?

[timid dove]

OnCollisionEnter gives you a Collision struct which has a relativeVelocity property which tells you how fast the two objects were going relative to each other. You can use that.
https://docs.unity3d.com/ScriptReference/Collision-relativeVelocity.html

[unique cave]

the Spring under the spring category. actually Id probably increase the damper and not touch the mass. so Spring, Damper and rb.mass are the options you can play with, maybe also rb.angularDrag

[dire ingot]

how to make rigibody2D move at a speed without physical randomization?

[timid dove]

wdym by "physical randomization"?

[dire ingot]

I need to calculate the distance of client movement on the server so I need it to be accurate

[timid dove]

If you want it to move at some specific velocity, just set its velocity to the velocity you want

[timid dove]

again wdym by "physical randomization"?

[wet fulcrum]

Hello, I have an issue that I've been trying to solve for 20+ hours in my android 2d game, is a small jitter every 2-3 seconds, if the camera is static the player jitters and if the camera is moving then the jitter is evident on the background. I'm using physics 2d and cinemachine. Rigidbody interpolation is on. And I've tried a simple script that adds force to an object in one direction and it's movement is not smooth also

Is it a setting I just have to turn off? I even asked a tarotist and she said it was bad luck and to give up

Should I?

[timid dove]

Show:

• your player movement code
• your camera follow script and/or cinemachine brain settings

[wet fulcrum]

I'm new to Unity, but I did try my best

Is not letting me upload text files

[timid dove]

#854851968446365696 for how to share code here (check the bottom)

[wet fulcrum]

So I'm going to delete things but that's the whole thing if you need it

oh ok

https://gdl.space/halayufafa.cs Class it inherits from

https://gdl.space/ofonavades.cs

actual class

Main class short https://gdl.space/opanuyugup.cs

[timid dove]

And... the camera code?

[wet fulcrum]

cinemachine brain pic

[timid dove]

oh right

what happens if you set update method to "Late Update"?

(and you did say your Rigidbody2D has interpolation enabled right?)

[wet fulcrum]

yes

I already tried that but I can do it again

I'm not that new, I have a few months

same issue with late update

btw issue on;y in my phone

phones

poco x3 nft and pixel 6

and maybe others

But I've only tested it on those

not on pc build

https://gdl.space/ulopuhawig.cs CharacterController class

Where you get the input change SimpleInput to Input and JumpButton.button.value to Input.getKeyDown any key

then delete the JumpButton.button.value = false just down those if statements

If you don't have any issues its fine, to test it on mobile you'll have to add a mobile input I use Simple Input.

Btw I doubt it has to do with the movement script or Cinemachine, a simple project with 2d shape adding it force had the same issue

[dire ingot]

how to keep speed on collision with collision2d. I don't want the speed to be reduced by friction with the wall

[slim olive]

use a kinematic rigidbody

[timid dove]

If you want to remove friction, use custom physics materials

[dire oasis]

hello, i am trying to make a gameobject that spawns into the scene but a certain distance above the ground so it looks like its floating, the current way is to make a box collider that goes past the object's bottom visual boundary so it is colliding with the floor making it appear to be floating. but i do not want the object to collide with the rest of the scene and be moved by other gameobjects such as the player. is there any way of doing a non colliding floating object?

[unique cave]

What? Why are you using physics if you dont want any collisions?

[timid dove]

Does it need to be physically simulated at all?

[austere coyote]

can somebody explain how i would make a simple ragdoll for my character?
i would use the ragdoll wizard but i need a full body for that
my character comes in two parts
i swear no tutorials online explain this process, only showing how to use the wizard

[timid dove]

Ragdolls are just:
Attach colliders and Rigidbodies to each bone in a skinned mesh, and attach the bones to each other with joints

This is of course quite tedious to do manually

Hence the wizard

[austere coyote]

alright

[austere coyote]

i wish i could use it lol

[austere coyote]

how do the joints work?

[timid dove]

Wdym?

Kind of a big question lol
https://docs.unity3d.com/Manual/Joints.html

[austere coyote]

well, just how do i connect them ig

[austere coyote]

ah yeah forgot there's unity docs on everything

so i want configurable joints?

[austere coyote]

oh i found how

or not

the bodies don't connect

[dire oasis]

because the ground height may vary, and i want to spawn in the game object and it falls down but still looks like its floating

i need it to be a certain length above ground

[unique cave]

Use raycast

[dire oasis]

ok, will try

[austere coyote]

i don't think my joints connected properly

all look like they are though when i look at them in the inspector window

[night current]

It just looks like one of the rotations is wrong

[austere coyote]

managed to fix it
the anchor for the knee rotation was off up in the hip for some reason

works fine-ish now

[pastel belfry]

Hey! Is there still a way to set skin width on a mesh collider in Unity 2020 and up?

[timid dove]

MeshCollider doesn't have skin width, no.

[pastel belfry]

they used to 😦

[timid dove]

Not afaik. Are you thinking of CharacterController?

[pastel belfry]

No

https://docs.unity3d.com/ScriptReference/MeshCollider-skinWidth.html

look

it's deprecated

obsolete

kaput

they killed it 4 years ago

but why

[terse chasm]

turns out you can

[timid dove]

you're writing the whole vector at once, which is the only way to do it.

[static cargo]

I feel like I am missing some basic understanding about RigidBody's here. In this clip, all objects are Dynamic and all have their Gravity Scale set to 0.

The moving objects have their position frozen and are being moved by a transform.RotateAround() method, their Mass is auto defined.

The object that I move in the gif does not have its position frozen, and has no other components other than Circle Collider 2D and the RigidBody.

My expectation is that the object I move should "rebound" when it collides with one of the moving objects. But it remains static, the velocity of the moving object is not applied.

Any words of wisdom as to why this might be the case?

[bleak umbra]

check drag, relative mass and physics material settings

[static cargo]

No luck with those settings unfortunately. I suspect transform.RotateAround may be the culprit, I believe it ignores Unity's physics system. Now trying to find an alternative way to emulate this orbiting behaviour on the moving objects

[static cargo]

Confirmed that transform.RotateAround was the issue by replacing it with a method that uses AddForce().

        Vector2 originToObject = transform.position - Origin.position;
        Vector2 tangentVector = Vector2.Perpendicular(originToObject);
        _rigidBody.AddForce(tangentVector * Speed);

Whilst I now get the colliding behaviour I'm after, there's much less control with regards to the "orbiting" behaviour. Ideally orbiting objects can never have their path altered by a collision, but still impart the appropriate forces on objects that are in its path. I'm a little lost as to what approach I could take in that regard 😓

[bleak umbra]

you can make the orbiting things kinematic and use rigidbody.MovePosition() / Rotation() which should make sure that collisions are correctly simulated and forces act correctly on other colliders. Alternatively you can use ForceMode.VelocityChange to retain control while using AddForce on active (non kinematic) rb.

[static cargo]

Excellent, thanks for these suggestions! I'll give the MovePosition a shot!

[stuck bay]

does unity's physics use rolling friction for spheres

[unique cave]

Nope

[prime flower]

@static cargo if you move a physics object by calling transform you are ignoring physics

sorry i was out of date

[late sable]

Hey yall, I'm working on a 2d project where a player should be able to move around and collide with objects on a spaceship that is experiencing linear and angular acceleration. Obviously I can't just parent the rigidbodies, and using a kinematic rigidbody for the player doesn't work since collisions won't register. Anyone have any advice? I've tried using GetPointVelocity to translate the player appropriately, but the player slides out of sync with the position of the ship at high speeds. Thanks!

[timid dove]

The canonical way to do this would be to use multi-scene physics

Wait unless you want the spaceship physics to actually affect the players?

If you want the spaceship motion to affect the players, then just giving everything colliders and dynamic Rigidbody2Ds will work fine

If you want the players to ignore the motion of the spaceship and remain "parented" to it while still having their own internal physics within the ship, then you do multiscene physics

[fringe laurel]

anyeone know how to properly reset an ArticulationBody? I got the root to reset properly but all the children are just wack.

[fringe laurel]

after a lot of testing in 2022.2f1 and 2020.3.36f1 i'm concluding there's a glitch with the Avatar Definition and reseting articulation body. I compared a working prefab to a new prefab and the new prefab fails to reset properly while the old prefab still works across both unity versions. the only way to get the new prefab to work was to change the new prefab's avartar definition to the old prefab's avatar definition.

[latent mist]

is it possible to execute joint physics in editor mode?

[late sable]

Interesting, thanks for the tip. My goal is to have a ship that can move around in space. If the ship is moving at 300 m/s, the player standing on it should move at the same speed, and likewise for rotational movement. The player should also be able to walk around locally on the ship.

With multi scene physics, I suppose I could have the ship exterior, which is moving in space, in the main scene, and the ship interior containing the player in a local scene. My only question is how do I make the ship interior move with the ship exterior? If I make the ship interior a child of the ship exterior, will the rigidbodies in the ship interior move relative to the ship exterior?

[timid dove]

If you do multiscene the Rigidbodies will be in completely separate simulations and won't interact with each other at all.

the general idea is that you use proxy objects to draw the interior objects inside the ship.

while they are being physically simulated off camera in the second scene

let's say your ship is box shaped. Imagine a simple unity game happening inside a non-moving box

the player can jump around freely etc and it's all fine.

That's what happens in the "interior" scene.

[late sable]

I see what you mean, so I can simulate the interior somewhere else and I can just copy the positions to "proxy" objects that are parented to the ship where the player will see. I'll try that, thanks.

[fringe laurel]

solved it! https://forum.unity.com/threads/mixamo-imported-fbx-has-broken-0-rotation-pose-marthon-envs-broken-character.1377030/

it had nothing to do with physics :V

[static cargo]

Is anyone aware of a minimalist(ish) rigidbody2D controller on the asset store or elsewhere? Most of the rigidbody controllers I come across on the asset store are quite feature rich. Thinking more in terms of a controller a bit like the ones in the game ROUNDS, works well with other rigidbody interactions, basic movement like jump, crouch, slope handling etc.

[bleak umbra]

a "rigidbody controller" is not a thing. do you mean a kinematic controller? if you need an actually simple one of either kind (force sim based or kinematic) you can easily DIY one or use the built-in one, if not (i.e you need actual control) there is really no shortcut and you need to deal with the complexity.

[static cargo]

Thanks, I meant the force sim kind. The only shortcut I'm looking for is to not run into pain points later down the road with my own implementation, my needs are fairly straight forward, so I'm hoping to learn from an example in parallel to building out more of the other games systems. I managed to find this one in the meantime that looks like it'll scratch the itch for now https://assetstore.unity.com/packages/tools/physics/physics-based-character-controller-203438

[pure mist]

I am creating joints based on world position of objects. But it seems that just getting the local space from the world objects isn't enough because the joints have their own orientation on axis, from what I understand, Y is up, X is forward, and Z is right. What formula/utility can I use to convert the orientations properly between two world-space objects?

[twin nebula]

How can I make these rigidbodies affect the cube? They're following a target via changing the velocity and are connected to the body using these settings

[timid dove]

Looks like the RB they're connected to is "Body" and not the root Player object?

Can you at least show the Rigidbody settings on "Body"?

oh also you have all the "motion" things set to "Free"

which means they're not going to affect anything basically

[twin nebula]

Ah crap right

Yeah hold on

[jovial depot]

Hello! I'm working with wheel colliders and I'm trying to create a car inspired by an F1 car. So, using a mass of 700kg on my rigidbody, my car is shaking too much. But using like 2000kg, the car is ok. using 2000kg could solve my problem, but I want to use 700kg like the real life car. Any ideas? Thanks 🙂

[twin nebula]

If I set the position and stuff to limited how would I let them freely extend and move but also affect the body at the same time then?

[timid dove]

you... wouldn't really? What are you trying to achieve here?

And why did you choose joints to achieve it

[timid dove]

play with the suspension settings maybe? IDK, you'd have to identify the source of the shaking

[jovial depot]

yeah, I guess that's the only solution xD

[twin nebula]

Okay so I'm trying to make physics based movement not to dissimilar to Gorilla Tag but sort of with a twist and.. actual physics instead of whatever Gorilla Tag does

Where you can sort of push off of the ground to move along

[timid dove]

Not familiar with that game unfortunately

[twin nebula]

Ah right that's fair

[timid dove]

Is it kinda like... Getting Over It?

[twin nebula]

In a way yeah

Basics are you have no legs so you push off of stuff to move along. It's in VR

[timid dove]

im gonna be real with you

if it's in VR

attaching an actual dynamic Rigidbody to the player camera rig or whatever it's called

is a recipe for vomit

Unless you can do it in a very limited/controlled way

though I guess I've played grapple games in vr that weren't that bad

I think basically the idea would be... as long as you're "holding" something, the RB should be kinematic and entirely controlled by the hands, and once you release you can go dynamic until you hit the ground or hold something again?

Or do you want something different from that

I imagine for example you want to be able to jump by pushing off the ground?

[twin nebula]

Yeah

I know it'd be sick but its mainly for me and a group of friends. Sorry I'm doing something while trying to speak at the same time lol. Do you get what I'm trying to achieve though? I can toss the old trailer here so you can see an example of the movement

[unique cave]

Have you taken the spoilers into account? They add downforce to the car according to the speed so you could imagine as if it increases the mass as the speed increases. Could that be it?

[stuck bay]

so cloth component doesnt provide back force. any way to block colliders from passing through?

[slim olive]

if I have a ragdoll and I want the velocity to be spread evenly on all rigidbodies, do I have to use the code in here?
https://docs.unity3d.com/2021.3/Documentation/ScriptReference/Joint-massScale.html

if so where should I place the component on?

on the joints like, upper arms and upper legs?

i need to do this because I'm using a trajectory prediction system and all the connected rigidbodies are messing with the calculations

so the trajectory path doesn't match with the phsyics

or, would I be able to somehow get the velocities of all rigidbodies and do something to even them all out?

[timid dove]

I would just calculate the weighted average momentum of all the rigidbodies

that will give you the velocity of the thing as a whole

[slim olive]

so, just add up all the velocities and divide them by the amount of rigidbodies?

[timid dove]

no

weighted

by mass

[slim olive]

is that a property

[timid dove]

add up (rb.mass * rb.velocity) for each body

and divide by the total mass

[slim olive]

ok thank you I'll try it out

[slim olive]

hm not getting good results

i mustve messed up

here's what I put

void GetRigidbodyAverageVelocity(Rigidbody[] rbs)
    {
        float TotalMass = 0;
        Vector3 WeightedVel = Vector3.zero;
        foreach (Rigidbody rigidbody in rbs)
        {
            TotalMass += rigidbody.mass;
            WeightedVel += rigidbody.mass * rigidbody.velocity;
        }
        Vector3 TotalVelocity = WeightedVel / TotalMass;
        print("total velocity is " + TotalVelocity);
        Vector3[] points = Trajectory.UpdateTraj(TotalVelocity, TotalMass/rbs.Length, transform.position);
        lr.positionCount = points.Length;
        print("points from trajectory is " + points.Length);
        print("start trajectory is " + points[0]);
        print("end trajectory is " + points[points.Length - 1]);
        lr.SetPositions(points);

    }

the trajectory predict script:

 public static Vector3[] UpdateTraj(Vector3 forcevector, float Mass, Vector3 StartPos)
    {
        List<Vector3> points = new List<Vector3>();
        Vector3 velocity = (forcevector / Mass) * Time.fixedDeltaTime;
        //float flightdur = (2 * velocity.y) / Physics.gravity.y;
        float flightdur = -10;
        float stepTime = flightdur / LineSegmentCount;

        for (int i = 0; i < LineSegmentCount; i++)
        {
            float steptimepassed = stepTime * i;
            Vector3 MoveVector = new Vector3(
                velocity.x * steptimepassed,
                velocity.y * steptimepassed - .5f * Physics.gravity.y * steptimepassed * steptimepassed,
                velocity.z * steptimepassed
                );
            points.Add(-MoveVector + StartPos);
        }
        //give line renderer array length
        //set line renderer positions

        return points.ToArray();
    }

how I add velocity to rigidbodies:

 foreach (Rigidbody ragdollBone in rigidbodies)
        {
            if(ragdollBone.CompareTag("Player"))
            {
                print("found a player tag, continuing");
                continue;
            }
            print("detatching rigidbody " + ragdollBone + " with " + Velocity + " velocity");
            ragdollBone.isKinematic = false;
            ragdollBone.AddForce(Velocity * FlyMultiplier, ForceMode.VelocityChange);
        }```

I'm adding force of about 10 to world left on all rigidbodies

and I get total velocity is (-9.33, 1.02, 0.00) which seems right but the ragdoll flies much farther than that

I think I'm going to have an invisible rigidbody that my ragdoll root is attatched to and have that be what has force added

[blissful flume]

Hi, I'm trying to replicate the claw machine in unity, including the "wiggle" of the claw when it's moving, could anybody help me set that up?

[robust maple]

• I'm straight away idiot in physics, so my question is going to extremely simple. I have 0 friction body sliding on another 0 friction body. How do i set the drag value so that the sliding body stops exactly after X seconds given that its velocity is exactly Y value? And also does this drag value take effect if i apply a force every new physics step?

[timid dove]

Don't use drag. Add a force in FixedUpdate with ForceMode.Aceleration. if you want it to stop after X seconds, and starting velocity is Y, then the force amount should be:
f = Y / X;

[robust maple]

• I control my character with forces, and whenever i walk on a slope, my character launches itself into the stratosphere. I don't see any reason why it would. Bounciness on both colliders is 0, friction is 0 as well. What could be the cause? Is it because my force is pointed inside the slope?

[unique pewter]

Hey, how can i make this vr component not move away from the white bar on top of it?

Currently it can move away from it like this

but I want it to not do that, like this:

[raven leaf]

How to stop the player (a capsule) from walking on a sphere that has a rigidbody ?

[timid dove]

Can you elaborate? Stop them from walking how? What should happen if the player walks on/near it?

[raven leaf]

push it instead of walking over it

[timid dove]

Is your player using a Rigidbody or a CharacterController?

[raven leaf]

A rigidBody

[velvet tusk]

hello, I am trying to make a "realistic" enough rope, where I can manipulate/drag around physics objects

I am doing this in VR, I tried doing the hinge joint rope, but when I attach the rope to the controller anchor the rope doesn't really gain any momentum, it for sure reacts but not in the way I would like it to

I've looked into other rope solutions but they seem to suffer from the same problem

I want to basically remake the blades of chaos from god of war

be able to swing them around in a convincing manner

[timid dove]

Hinge joints work but your problem is you're not moving the anchor in a physics friendly way

You need to basically make a kinematic proxy Rigidbody which follows your anchor using MovePosition and MoveRotation

Make that the root of the chain

[velvet tusk]

so I basically unparent the rope from the controller

connect the rope base's rigidbody to the controller using a script that moves it using MovePosition and MoveRotation?

[shell night]

or just attach it to the controller using a spring with high strength and dampening

[velvet tusk]

that could work

let me try PreatorBlue's suggestion first, then yours, and I'll report back shortly

PreatorBlue's idea work to an extent, the movement of the rope sections feel a bit slow, might be just a matter of adjusting weights

will try using a spring joint

the spring definitely improves the weighti-ness

just gonna combine the both

see what I come up with

it loves to freak out to infinity tho

it still loves freaking out

yeah it still doesn't work properly

[velvet turret]

Good morning. So, this bit of code, if I understand it, says to cast a ray from a position downward and ignore whatever is on _layerMask, correct?
Physics.Raycast(_spawnPosition, Vector3.down, out _hit, Mathf.Infinity, _layerMask)
And this:
int _layerMask = 1 << 3;
says put whatever is on layer 3 into the _layerMask, correct? So that when it casts a ray, and the ray hits the terrain which is on layer 3, it should ignore that collision.

[timid dove]

The layers in the mask are the only layers the Raycast will hit

So it will ignore everything except layer 3

[velvet turret]

OK. Man, I'm struggling with this. Casting a ray either with the mask or without reports a hit, but I know there's nothing but terrain at that location.

[timid dove]

Why don't you just print out whatever it's hitting

Also yeah that would make sense

It's hitting the terrain as expected

Why wouldn't it?

[velvet turret]

And if I remove the _layerMask, it's going to report ANYTHING it hits, correct?

Debug...yep. Thanks, PraetorBlue. I'll work it.

[timid dove]

Whatever layermask you use, it will hit only objects on those layers contained in the mask. The default mask (if you don't include one) includes all layers except the IgnoreRaycast layer

[velvet turret]

Thanks for the help.

[restive wraith]

I'm trying to make a platformer game where you can move around using a stick. The script kinda works but when you look around the stick tends to get stuck in things. Any idea how to fix it?

[timid dove]

You're teleporting the stick rotation via the Transform

you have to move physics objects via their Rigidbodies

or you get weirdness

[restive wraith]

do you have any idea how to do it?

cuz im stuck basically

i want to rotate the stick towards the direction the camera is looking

[timid dove]

Yep, move the Rigidbody via its methods.

MoveRotation and/or AddTorque and/or setting angularVelocity

[restive wraith]

i tried angular velocity but it doesnt really work

so ill check the other

[wind nebula]

am wanting to make and use a lot of scenes with unique physics. Is there any overhead to running dozens of these at the same time other than their physics simulations?

[timid dove]

Just the memory and simulation requirements of all the scenes

[high scarab]

Guys who is proficient with Wheel collider and car physics here?

If someone can help me understand problems

[timid dove]

https://dontasktoask.com/

[gentle wedge]

So im on the newer side of unity and was wondering how to make a vehicle move with mecanum wheels on, I found a video on how to make a basic vehicle move, should I try that and go from there?

[wind nebula]

Is it possible to have uniquely different gravities in subsequently loaded/created PhysicsScene2D scenes? I had presumed this would be possible, but can't find any way to set unique gravity properties in subsequent Scenes

[manic otter]

can you tell me how can i stop jittering for 4 boxes they are connected each other via fixed joint

[manic otter]

any help?

[velvet tusk]

yeah joints are apparently a pain

what are you trying to achieve with said joints?

[manic otter]

Rocket

[velvet tusk]

rocket?

why does a rocket need a joint?

[steady pawn]

bendy rocket

[vernal owl]

for the epic thrust vectoring animations of course

any rocket game without that effect would be kinda cringe

[manic otter]

can you help me?

this is rocket

can you tell me how can i stop jittering for 4 boxes they are connected each other via fixed joint

[shell night]

i dont see any boxes in that image

[manic otter]

stages

[shell night]

and why are they connecte with a joint?

[manic otter]

first stage second stage and connectors are boxes

[shell night]

but why would you use a joint to connect them? just because they're attached in the real world, doesn't mean you need to attach them with a joint

[manic otter]

okey and how can i attach each other?

[shell night]

make an empty object and parent all of the sections to that one. then put the rigid body on the empty object

[manic otter]

you are right

thank you man

[tulip sparrow]

how would i make an object in unity3d have no sliding

[tulip sparrow]

so when i move it

it speeds up instantly

and deecelerates instantly

[inner thistle]

Make it kinematic and use MovePosition to move it

[timid dove]

First figure out the source of your current sliding

Is it just due to physics? Is it due to the inherent acceleration on input.GetAxis?

[hardy herald]

if anyone has experience which car physics asset is best for semi arcade style drifting game?

i found edy`s vehicle physics and NWH that stands out from the others but they are both paid so i thought id ask

[round scroll]

Got a problem with Unity 2D physics, I got a bullet prefab sprite, and in it's code, it's set to ignore collision with object from bullet layer, yet they collide always

I tried ignoring layer, tag... Everything

I need collision for detecting collision with enemies

But I don't want bullets to collide

Any idea why they collide?

[unique cave]

How are you ignoring the layers in the code?

[round scroll]

Something down the line of Physicas ignore collision with Layer Bullet, wait I'll search the code

GameObject[] otherBullets = GameObject.FindGameObjectsWithTag("Bullet");

    // Ignore collision between this bullet and all other bullets
    foreach (GameObject otherBullet in otherBullets)
    {
        Physics2D.IgnoreCollision(collider, otherBullet.GetComponent<Collider2D>());
    }
}

This is somewhat of a fragment to ignore

First taking the layer

Using FindGaneObject

And then ignore it

Worked before

Just no on the damn bullets

[unique cave]

Why are you not directly using the layer collision matrix?

[unique cave]

In case you want to use this approach, you have to make sure this requirement is taken into account:

You can only apply the ignore collision to Colliders in active game objects. When deactivating the Collider the IgnoreCollision state will be lost and you have to call Physics2D.IgnoreCollision again

[round scroll]

But it's ignoring only collision with objects from the Bullet layer

I'm not deactivating the collider, I'm just ignoring collision with objects from the same layer, and at the end, that shouldn't be the problem since they still collide with each other

[unique cave]

But are the bullets already active at the time of that call?

[unique cave]

But again, why not just use the layer collision matrix?

[round scroll]

How can I use it?

[round scroll]

Yes

[unique cave]

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

Make sure to use the collision matrix from Physics2D and not Physics, thats meant for 3d physics

Physics2D.IgnoreLayerCollision should work too, I think that just changes the matrix under the hood

[round scroll]

Thanks

[round scroll]

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

public class Bullet : MonoBehaviour
{
    public string tagToCheck = "Enemy";

    void Start()
    {
        // Ignore collisions between the sprite and objects in Layer 2
        Physics2D.IgnoreLayerCollision(gameObject.layer, LayerMask.NameToLayer("Layer 2"));
        // Ignore collisions between the sprite and objects in Layer 1
        Physics2D.IgnoreLayerCollision(gameObject.layer, LayerMask.NameToLayer("Layer 1"));

        // Get the colliders for the Player and Enemy GameObjects
        Collider2D BulletCollider = GameObject.FindWithTag("Bullet").GetComponent<Collider2D>();
        Collider2D GermanBulletCollider = GameObject.FindWithTag("Bullet German").GetComponent<Collider2D>();

        // Ignore collision between the Player and Enemy colliders
        Physics2D.IgnoreCollision(BulletCollider, GermanBulletCollider);


    }




    void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag == tagToCheck)
        {
            Destroy(gameObject);
        }
    }
}

thats the code, I messed up something while sending the code and sended the wrong one

@unique cave

if you are occupied, then sorry for the ping

[lavish latch]

Hi, Is possible to implement "Bullet physics engine " into unity? And if it is how would I go about it?

[timid dove]

Sure, there's an asset for it: https://assetstore.unity.com/packages/tools/physics/bullet-physics-for-unity-62991

[lavish latch]

Oh, thats actually convenient. Thank you

[torpid basin]

Heyo. I'm trying terrains for the first time.
My player keeps randomly, consistently falling through the terrain.
The players RigidBody moves exclusively using MovePosition and MoveRotation inside of fixed update.
I've tried it with the player having both a box and capsule collider.
Any thoughts? I imagine there's some simple solution I'm unaware of as it's my first time using terrain.

[timid dove]

MovePosition doesn't respect collisions

Try using velocity

[torpid basin]

Oh wow, alright thanks, will do(:

[thorny tree]

good morning everyone. i have a problem with some Doors in my simulation. Basically I set them based on these settings: The door is formed by Door plus Handle. The Door has a Collider (Box), a Rigidbody and a Hinge Joint. In turn the Handle has a Collider Box, a Rigidbody, the XR Grab Interactable and finally the Fixed Joint.

Some ports with these settings work correctly. Others, however, tend to move all the time, either from the start of the simulation or as I interact with them.

What do you think it could be? Thank u.

[vital thunder]

Can anyone help me with active ragdolls or more specifically configurable joints?
https://www.reddit.com/r/Unity3D/comments/101jfgn/trying_to_create_active_ragdoll_controller_the/

[red oriole]

how to make correctly particles collide "jump" on plane, but not when they are not on the plane anymore? i tried enabling collision on the particle system and selecting the plane, but the particles continue "jumping" even when they are not on the plane anymore

[velvet tusk]

I asume this is a problem with the way the particle system is set up

check with #✨┃vfx-and-particles

[thorny tree]

Is there really no one who can help me? 😅

[iron lava]

if (!Physics.Raycast(transform.position, new Vector3(0, NPC_direction + (dir * 45)), dist))

This isn't working, and is instead raycasting UP wards, when it should raycast in front of the NPC (NPC_Direction is rotation.y, and dir is the direction your trying to rotate in)

Anyone know why this isn't working?

[timid dove]

rotation.y ? What do you mean by that? An euler angle? PArt of a quaternion? Neither of those would be appropriate here

If you just want the NPC's forward direction, you should use npc.transform.forward

[iron lava]

Yeah, but I also want to rotate the raycast by 45, 90, or 135 degrees. This is for a pathfinding algorithm

[iron lava]

And yes, euler angles

[timid dove]

yeah that's not appropriate at all here. This is a direction vector

[timid dove]

then rotate it. To rotate a vctor you can multiply by a quaternion.
e.g. rotated 45 degrees on the y axis:

Vector3 forward = transform.forward;
Vector3 rotated45 = Quaternion.Euler(0, 45, 0) * forward;```

[iron lava]

Oh my god, ugh...

I'm sleepy, and also it worked with other vectors as well...

Like when shooting

[timid dove]

doubt it

except by accident

or you did something different

if you add the vector (0, 45, 0) to a vector, you're adding a straight up vector to it

euler angle vectors and direction vectors have completely different meanings

[iron lava]

Right