⚛️┃physics

[lapis plaza]

also that VertExmotion isn't real physics softbody sim but depending on your needs for this, it may work just fine for you

[marble blade]

They don't, and they are in a layer that is not self-colliding

[cobalt pilot]

when using obi rope, it just falls through all colliders

how do I add a rope collider?

[tiny osprey]

thx

[gleaming gorge]

I'm not sure with what you mean with not self-colliding layer, are each of them in separate layer?

btw here's my quick attempt

[weary moon]

Hi

im experiencing some weird behaviour with collision.getcontacts

as you can see, when my collider is resting on the ground, the contact points are detected on the ground as expected

but when its pushing up against a wall, but also resting on the ground, only the wall's contact points are being detected

(as shown by the yellow spheres gizmos)

the specific issue im having with this is that im checking the contact points to see if the player is on the ground based on the contactpoint's normal vector, but when its against the wall, it's giving false negatives

[timid dove]

I would expect there to be multiple collisions

which collision are you reading the contacts from?

Seems like you're reading the contacts from the wall collision

[weary moon]

this is a new concept to me

[timid dove]

Each OnCollisionXXX callback will run once for each individual collision

[weary moon]

i thought there was only 1 collision per frame? or

[timid dove]

no, there can be any number

[weary moon]

ohhhh

oh okay thats very useful information actually thank you

ill see if this can help me fix my issue

[timid dove]

I'd guess you're just drawing whichever happens to be the last collision processed on a given physics frame

and that's happening to be the one with the wall

[weary moon]

you were right! i cleared my list of contactpoints in Update instead of OnCollisionEnter and it worked thank you

[marble blade]

The collision matrix is set so that objects of this layer won't test collisions with other objects of this layer.

Thank you for your test. The bug only appears on constraint, not gravity. You can get more details about the issu on the forum thred here: https://forum.unity.com/threads/the-simplest-chain-of-configurablejoints-is-deformed-in-a-strange-manner.1179289/#post-7553968

Can you remove gravity, add a drive to your joints and push the chain with an object?

[gleaming gorge]

Ah IC... I forgot that we can do that
btw, I made some changes to the joints based on your screenshot in the forum, it 'bends' nicely but it's not as stiff as the one in the gif

[marble blade]

I've tried with multiple stiffnesses and the issue was almost always present. Can you please share the unitypackage of your test project?

[gleaming gorge]

Sure, here it is, I think I can make it 'stiffer' by scaling everything down

[marble blade]

I will inspect that. I would not be surprised that the issue only appears at certain scales. my capsules are only 0.03 world unit long and the mass is 0.3 par segment. if you are working with a 10x scale, it may be very different for the physic engine precision

[gleaming gorge]

Yep, that could be the problem, at default capsule size, the issue might be there as well, but it's less noticeable

[marble blade]

anyway thank you very much for your time

[gleaming gorge]

no problem 🙂

[tiny osprey]

I have a game where the player controls a flying rigidbody... When it flies without hitting anything it does fine - however when it bumps into a collider, it often starts to handle in a very weird way, almost like some inertia has been applied to it that I can't overcome with the controls. Has anyone else had something like this?

[timid dove]

Sounds like your script is fighting against the Rigidbody and probably teleporting it around instead of controlling it through forces

[tiny osprey]

You are right, the Rigidbody uses AddForce to go up and down... but pitch yaw and roll and controlled by modifying transform.rotate according to inputs

[pallid saffron]

Could someone help my with this? My bike is kinda ... weird

Here would be the program, which controlls the bike, if you need it

[timid dove]

You'd have to explain what your desired behavior is

[pallid saffron]

Bike-Behavour. That the wheels dont slip on the ground so much and that the bike doesnt jump like a kangaroo

[timid dove]

real bike dynamics are pretty complicated. THere's a whole dynamic with leaning and conservation of momentum and gyroscopic effects. Your current code doesn't account for or simulate any of that

[pallid saffron]

I'm pretty sure the leaning part is in the code

But that's a point for later. My biggest problem is, that the wheel completely slips and when I try to change that by changing the stiffness of the wheel collider, the bike starts to jump like crazy

[cobalt pilot]

anyone have any way I could add a rope that doesnt eat half my fps

cuz obi rope does

it's purely visual

[twin storm]

You could try a line render with physics. Here's a video I found: https://www.youtube.com/watch?v=ej5mt4v9UKs

[cobalt pilot]

Oh okay thanks

[lapis plaza]

@cobalt pilotobi publisher also has Filo which is supposedly cheaper to compute but I don't have any first hand experience on it

[stuck bay]

https://streamable.com/ngf4cq

I'm having trouble with my hinge joints

why are they doing that?

[cobalt pilot]

Isnt that just for cables?

Not normal ropes

[lapis plaza]

totally depends on what you need this for, but yeah, it's more closed loop simulation

are you having perf issues with obi on editor only or in build? I found some of their things kinda sluggish in editor while using Burst despite disabling all the safety checks, actual build ran fast

[cobalt pilot]

In esitor

But it just doesny build

And gets a ton of errors

Whne I try to build with obi rope

[lapis plaza]

ah, well that's problematic then

you can also use Obi with their native solder instead of the burst one, see if it works any better for you

for build issues and such, probably better contact the publisher directly for it (unless you are using unsupported editor version for it, like latest betas etc)

[stuck bay]

https://gyazo.com/bf2b2c8a082eb85c0854cf1e20155cac

here is a photo of the hinge join t

[cobalt pilot]

@lapis plaza isnt there a plugin or something that just takes a bunch of rigisobdys with distance joints and draw a rope between them?

[lapis plaza]

probably, it's not horribly difficult to make yourself either

[cobalt pilot]

True

[lapis plaza]

also expect a lot of fancy glitches with anything rigidbody based 🙂

RB's like to explode when clipped

[cobalt pilot]

Lol

[pliant fern]

I'm trying to make this torus go down this curved ramp, but it keeps getting stuck at this part. What can I do to fix this?

I used a sphere collider to try to counter-act it, and that works, but the torus spins now which I don't want. How would I keep it rolling without spinning?

[golden cloak]

change the ramp, lower the friction, or speed of the torus?

[gaunt sinew]

Just freezing the z rotation in the rigidbody should work I think.

[pliant fern]

i tried that but it was being weird for the second half of the ramp

it wasnt rotated the right way for the second half

[twin oriole]

Hey can someone help me out on this?, the character (the capsule) keeps falling of the ground when i press play

i searched for a while and i cant find a reason on why it keeps falling off

[golden cloak]

i think you need to press "is trigger"

[gaunt sinew]

Check to make sure neither is set to trigger and then check the collision layers.

[gaunt sinew]

That is the opposite of what they want. Toggling Is Trigger will make it a trigger causing it not to have collisions.

[twin oriole]

yeah its not set to trigger and the collision layer (ground) is actually being detected

[gaunt sinew]

What layer is the player on?

Are you making sure that those layers collide?

[twin oriole]

oh i didn't check that

[golden cloak]

ah fair enough, haven't done anything with unity for so long and trying to get back into it

[twin oriole]

nope it doesnt work 😦

[golden cloak]

with falling off do you mean, fall through the platform, or do you mean that it falls over and doesn't stay upright?

[twin oriole]

no it falls through the platform

[golden cloak]

you made a custom layer "ground" ?

can you switch that back to default and check what happens?

[twin oriole]

ok

nope its still falling

[golden cloak]

what layer is the player in? in " player" ?

[twin oriole]

its like the physics in untiy didnt work

no its in default

[golden cloak]

hmm

does the player have a rigidbody?

[twin oriole]

yeah

[golden cloak]

weird, I made a cube, gave capsule a rigidbody, and it falls against the cube and stops

[twin oriole]

so wierd

im gonna try opening it in another project just in case

[golden cloak]

did you give player, orientation or head, the rigidbody

[twin oriole]

the player (the capsule itself)

[golden cloak]

I mean that should work then haha

[twin oriole]

yeah brb im gonna try that rn

[golden cloak]

did it work?

[twin oriole]

srry yeah it did

i figured it out just now

i accidentaly removed the capsule collider from the capsule

[golden cloak]

lol

well good that you found it!

[twin oriole]

so it would like react to the physics of the project but no interactions at all

ty

[golden cloak]

no problem, usually its something simple

[main socket]

Hey can anyone help me with this? I'm using a CharacterController on a simple capsule and I'm seeing some weirdness with the Step Offset.

I have Step Offset set to 0.5 - so the capsule should not mount anything higher than this value.

I've set up a box which is scaleY = 1, and the player cannot mount it (expected).

But if I walk at this box at an angle, the player seems to be able to mount it:

This is the capsule's CharacterController settings:

[timid dove]

Can you show your code?

[viral wharf]

can some body help me with the physics of the tile collider, it seem very rough when a rigid body slide on it. I try to slide on it and sometimes it just rotate while sliding(z rotation on) or immediately stop (z rotation off)

https://drive.google.com/file/d/1P6mIusMUwUD9Zr7m2H6tGojPbD5ABguA/view?usp=sharing

[pliant fern]

I've figured out how to get it to roll down well, but now the torus won't change to be facing in the right direction while going down the slope since it won't rotate at all. How can I make it so that the torus rotates correctly with the ramp without rolling with the sphere?

[digital mesa]

Has anyone encountered a GameObject having gravity when giving it a CharacterController when it has no RigidBody? I imported the "Unity Starter Assets" to use the character model and animations. In fact the only part of that package I did import was the Starter Assets/ThirdPersonController/Character folder. I'm using my own code for the actual controller, but I've attached a CharacterController to the prefab in my scene and everything is working as expected with one small oddity: The character has gravity. If I disable the CharacterController component on the character in the scene view then there's no gravity, but otherwise there is.

There is no RigidBody on the object (I know it conflicts with the CharacterController). I don't even have a gravity value set. I'm just doing horizontal movement and noted the model fell down when I stepped off the block I was using for ground. Any thoughts on what's causing this?

One more thing I just noticed . . . if I disable the Animator it also stops the automatic falling / gravity.

[digital mesa]

Yeah, looks like it's tied to the "Root Motion" of the animator . . . but the idle pose doesn't have any motion of its own. Any reason why it's getting gravity?

Okay, I think I figured it out. I went into the animations themselves and disabled "Root Transform Position (Y) => Bake Into Pose" and it seems to be working.

[pliant fern]

To elaborate on what I'm trying to do, I'm trying to make it so that the torus is rotated in the same direction the sphere is moving.

[main socket]

and on update:

[manic harbor]

if i have a raycast related question, do i ask it here or?

[shell adder]

yeah you can

other code channels work as well

[manic harbor]

Well this is my issue then. I'm not really that experienced with raycast but my plan is to make the ray do something if there is nothing between the red and the blue and do something else if it collides with something that is in between the two

but as you can see, it's green no matter what

[shell adder]

does the shelf thing have a collider?

[manic harbor]

you mean the red one? if so, yes

[shell adder]

i mean what's in between the two

the grey thing

[manic harbor]

oh just a basic wall

[shell adder]

does it have a collider?

[manic harbor]

yes

[shell adder]

is the collider set to trigger

[manic harbor]

nope

[shell adder]

can you show your raycast code

and what you're using to draw the raycast

[manic harbor]

        RaycastHit hit;

        
        if (Physics.Raycast(transform.position, player.transform.position, out hit, Mathf.Infinity))
        {
            Debug.DrawLine(transform.position, player.transform.position, Color.red);
        }
        else
        {
            Debug.DrawLine(transform.position, player.transform.position, Color.green);
        }

sometimes it works tho

but i think the code is whack tho

[shell adder]

second argument for raycast is a direction, you've given it a position

while for the draw line it is two positions

if you want to get the direction between the two, do player.transform.position-transform.position

[manic harbor]

the thing is that i want the ray to follow the player

[shell adder]

if you want to see the actual ray you can do DrawRay

[shell adder]

you're calling this on the blue object?

and player is red?

or other way round

[manic harbor]

other way around

the red is creating the ray

because i want it to check if the player if behind an object or not

[shell adder]

Vector3 direction = player.transform.position - transform.position;

that should be the second argument

and do Debug.DrawRay instead of draw line with the same arguments to actually see where it's going

[manic harbor]

seems like your way works

now it's detecting that it hits everything

[shell adder]

that's because the max distance is infinity, and there is no layer mask

to get the distance between the player and the transform
Vector3.distance(player.transform.position, transform.position)

and if you only want walls to be detected, make a wall layer, set only walls to that layer, and then make a serialized LayerMask variable so that you can assign it in the inspector and pass it into the raycast

[manic harbor]

oh so the distance should be maxdistance, got it

but for the direction though?

[shell adder]

the direction is
(player.transform.position - transform.position).normalized

normalized since the distance shouldn't matter only the direction

you can check with debug.drawray

[manic harbor]

so direction is (player.transform.position - transform.position).normalized
and maxDistance is Vector3 direction = player.transform.position - transform.position ?

if i understood you correctly

[shell adder]

use Vector3.distance(transform.position, player.transform.position)

that returns a float for the distance

[manic harbor]

i did that

but it doesn't render it

[shell adder]

can you show your code?

[manic harbor]

        RaycastHit hit;
        float maxDis = Vector3.Distance(transform.position, player.transform.position);
        
        if (Physics.Raycast(transform.position, (player.transform.position - transform.position).normalized, out hit, maxDis))
        {
            Debug.DrawRay(transform.position, (player.transform.position - transform.position).normalized, Color.red);
        }
        else
        {
            Debug.DrawRay(transform.position, (player.transform.position - transform.position).normalized, Color.green);
        }

sorry if im misunderstanding btw

[shell adder]

for drawray the second argument needs to be direction * length

btw you should store (player.transform.position - transform.position).normalized in a vector 3

less repeating

[manic harbor]

got you, now it's rendering

[shell adder]

cool

[manic harbor]

i guess it's the layermask thing that is the issue then

[shell adder]

it's now detecting the player most likely

[shell adder]

yep

make a layermask for the wall

you can check what it's hitting by logging hit.collider.name

[manic harbor]

surprisingly i don't need it, only had to assign the wall to the layermask and it works

[shell adder]

nice

[manic harbor]

left = not hitting a wall
right = hitting a wall

thank you so much honestly

[shell adder]

np

[pliant fern]

I'm not entirely sure how to make it so that a torus goes down a slope rotating while parented to a sphere without rolling. I've looked everywhere to try and find a solution but I haven't been able to

[pliant fern]

Essentially when ball is rolling down a slope, the whole torus should be flat on the slope. Currently, part of the torus is sticking out because it doesn't rotate at all, because I can't figure out a way to get it to rotate without rolling with the ball, which I don't want.

[weak hull]

Hi All , I am making a small game where you need to try and juggle the ball in the air. I have a rigidbody component attached to the ball (with a bounce physics material) and a collider on the paw. However, the ball does not want to bounce up when I hit it with the paw. I also tried adding some rb.AddForce scripts to add force on collision. The addforce usually works well when the paw is stationary, but never works when moving. Any thoughts for a better direction I could take?
https://media.giphy.com/media/fNvZYLancszaD0hlXS/giphy.gif

[shell adder]

how are you moving the paw?

[weak hull]

I am using the new input system and the paw is using the location of the last position of the click to move there, and then back down to the bottom

[shell adder]

can you show the script?

[weak hull]

Below is what is being called to move the paw.

    public void Move(Vector2 screenPosition, float time) {
        Vector3 screenCoordinates = new Vector3(screenPosition.x, screenPosition.y, cameraMain.nearClipPlane);
        Vector3 worldCoordinates = cameraMain.ScreenToWorldPoint(screenCoordinates);
        worldCoordinates.z = 0;

        // float step = speed * Time.deltaTime;
        transform.position = worldCoordinates;
        hasClicked = true;
    }

[shell adder]

yeah so that may be a source of the issue

you're moving something that should be physics related by setting transform.position

that'll mean that the rigidbody is just teleporting around, meaning that it won't detect collisions properly, which is probably why there's the lack of bounciness

you'll want to use something like addForce on the paw's rigidbody

[weak hull]

My bad, I should have clarified. The movement script is associated with an empty object with the renderer turned off and I have a follow script attached to the paw so that it wouldn't just teleport around. Below is the script on the paw and above is the script on the empty object

    void Update() {
        float step = speed * Time.deltaTime;
        transform.position = Vector3.MoveTowards(transform.position, target.position, step);

        Vector2 targetRotation = Vector3.Lerp(transform.up * -1f, (center.position - transform.position), step);
        transform.up = targetRotation * -1f;
        
    }

[shell adder]

so you're also doing this in Update, you'll want to do it in FixedUpdate so that it's in time with the physics system

[weak hull]

Ahhh good thinking! 🤦‍♂️ Don't know why I missed that. Let me try that out

[shell adder]

also, https://docs.unity3d.com/ScriptReference/Rigidbody.MovePosition.html would be better than setting transform.position

[weak hull]

Thanks @shell adder your suggestions worked. Appreciate all the help! 🍻

[pliant fern]

I still have no idea how I'm meant to fix this. I know I'll probably have to grab the velocity and then rotate the torus based on that somehow, but I'm not sure exactly how.

[timid dove]

Can you show a diagram or something of what you're trying to achieve? I read your description and I['m just confused

[bold zodiac]

Hey, i'm new to C# and Unity, can anyone tell me why my square is clipping through corners?

It only clips at corners, when it is touching both walls at once

I can provide more info if needed

[shell adder]

can you show your movement code?

[stuck bay]

Okay so I know how to detect this cube hitting my platform and playing a sound

but i wanna play another sound when the other edge hits down too... do you guys understand?

[soft shard]

if I want to have a trigger with compound colliders should I put a kinematic rigidbody on the parent? are there any performance implications?

[stuck bay]

example

like it should play a sound when it hits (1st image) , then it falls further onto the other corner (2nd image) and should play a sound too(maybe quieter), and then in 3rd too

[desert wave]

https://forum.unity.com/threads/open-source-physsound-physics-audio-system.334297/

try looking at this package

[stuck bay]

oh thanks i couldnt find or actually didnt know what to search for

[chilly remnant]

Just put triggers on the corners to play sounds where the sound would be relative to velocity.

ie the impact made

[stuck bay]

Oh hmm

that could work

I didn't think of it

[chilly remnant]

If all four corners hit at the same time, you'll get some strange but expected noise.

[stuck bay]

I can put these 8 children as box colliders right and the parent will get the OnTriggerEnter in the script I assume

[chilly remnant]

Else if the surface isn't flat and the body hits (ie collision but no triggers) play a sound as well; for edge cases.

[stuck bay]

oh lol ..

i mean its alright i just play one in OnCollisionEnter as well 😂

[chilly remnant]

That would make corners play two sounds each

Where we needed the corner triggers because one corner may have been touching when the other just fell and needs sound to be played.

So corners play sound on trigger and body plays if-and-only-if corners aren't touching.

[stuck bay]

hmm it seems much better now

Yea but if all land at same time its like boom loud sound

[chilly remnant]

And that's too be expected 😛

[stuck bay]

yea

but its a bit too loud hmm

i'll try changing volume

[chilly remnant]

Else play if only not already playing or with some delayed cd etc.

[stuck bay]

oh yeah that would be possible too or like max 2 or 3

yeah cd seems good since idk if i can check how many playing active

Oh and i didnt add it yet, that it plays volume relative to velocity

[chilly remnant]

velocity magnitude would be the energy the object has

Divided by maximum expected speed would be the ratio the audio should be playing at

[stuck bay]

yeah but how do i uhhh

oh its like jumping tho addforce stuff and torque

i think "clamp" ?

but like i have to normalize or whatever idk

[chilly remnant]

Not sure, you'll have to design (think/thinker) this part.

Where constraints are what you desire.

[stuck bay]

i should maybe try and set a max speed based on gameplay

just look whats max mostly

Cooldown of 0.05f seems ok rn

actually.. 🤔 since its based on fixed delta time i guess it wouldnt make sense to go lower than that

float volume = Mathf.Clamp( myrb.velocity.magnitude / 4.0f, 0.5f, 1.0f); // 4 magic number as MAX SPEED!```

so i got this now

seems to work ok-ish

[hollow topaz]

Does anyone Know how to stop a character from unflipping? When a character does a full flip it needs to unflip its self, if it doesnt for a full flip it uprights itself correctly.

This is my code for keeping it upright

[stuck bay]

@hollow topaz idk where but you probably need to modulo it with 360 somewhere?

[hollow topaz]

@stuck bay right but it I debug what angles its at, it never goes above 360, as if unity calculates it

but ill try

[hollow topaz]

@stuck bay Thank you, I managed to find a solution

[humble imp]

anyone know how to set up a spring joint that does not lose energy?

[stuck bay]

Hi I’m trying to make my furniture movable by the player and I’m not sure how to do so.

[subtle axle]

Why do you want this?

[humble imp]

to have a bopping effect that just keeps going

up down up down

[timid dove]

PhysX (unity's physics engine) is optimized for performance, not realism. You won't be able to get things like perfectly elastic collisions or pefect energy conservation

You might be better off coding the motion yourself if you need that

You might be able to just use the Sine function if you want something that infinitely bounces up and down like that

[sour lake]

How would I go about making a camera only collide able with objects that have a certain tag? I have the system all set up, but if you scroll too far on the mouse wheel it phases through the ground. Is this the right place to ask such a question?

[timid dove]

You can really only filter collisions by layers, not tags

also are you using Cinemachine for this?

[sour lake]

No. There are no addons

I would need to code it from scratch then?

[timid dove]

pretty much

[sour lake]

ok thank you

[timid dove]

depends what you mean by the camera colliding with stuff

you have a camera follow script I assume?

And you want the camera to not go through walls etc I imagine?

[sour lake]

It is rts inspired, the camera is entirely independent. Think of Men of War.

[timid dove]

never played it

[sour lake]

Any rts could fit this analogy

[timid dove]

If the camera moves independently and you just want it not to go through solid objects, I recommend using a CharacterController on it, and move it via the Move() function on the CharacterController

you'll get collisions for free that way

I have a top down factory builder game I'm working on and use that technique. It's a free flying overhead camera, works great

[sour lake]

oh that's nice. is it a sims type of builder?

[timid dove]

THink like Factorio/Satisfactory/Dyson Sphere Project

[sour lake]

Ah, nice. Well ill go see what I can do with this character controller method. appreciate the help.

[humble imp]

?? realism im not looking for realism

just asking if its possible or not. you could just say no. or do anyone have a good youtube video explanation on the properties of the spring joint? can't seem to find one. To be fair, a spring that bounces forever is not even real so....

[subtle axle]

I think you probably want something more like Mathf.PingPong
https://docs.unity3d.com/ScriptReference/Mathf.PingPong.html

This will return an oscillating value for controlled up/down movements

[desert wave]

https://images-ext-2.discordapp.net/external/ZBIqytMBfIfAfjqAyA8QIOl93lBlSkDZD9ViSyaXwcs/%3Fauto%3Dwebp%26s%3Da099f2d59cc70e1768805322713431ceee697ee6/https/preview.redd.it/6y8myu3ruxo71.png?width=498&height=473
can any mod pin this image?

[shadow seal]

brilliant graphic

[supple sparrow]

isn't it the same thing as the manual description ?

[desert wave]

summarized in one, with good UI

[supple sparrow]

fair enough

[hushed shard]

in unity hey guys how can i add acceleration to my player what is the math for acceleration?
how would i code it?

[jovial wraith]

endVelocity = startVelocity + acceleration * deltaTime is the math for acceleration

[hushed shard]

what does acceleration equal tho

[jovial wraith]

whatever you want it to

[hushed shard]

oh i did all of this code... was this all unecessary cs if (Input.GetKey(KeyCode.D) || Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.S)) { //divide the amount of speed you want by the amount of time you want to reach max velocity speed += 8 * Time.deltaTime; } else { speed -= 0.2f; } if (speed > max_vel) { speed = max_vel; } if (speed < min_vel) { speed = min_vel; }

[jovial wraith]

this matches what I wrote just fine. In your case, acceleration is 8 m/s^2. You also have drag in there (0.2) and you've clamped the velocity between some min and max. All of that is fine.

[shrewd ibex]

guys, how can I make a ball react to physics and get pushed away fast when the player pushes it. Because right now when my player tries to push a ball they do move but really slow.

[hushed shard]

kk cool.

[jovial wraith]

decrease the mass of the rigidbody

[hushed shard]

i still dont completely understand time.deltatime

[jovial wraith]

Time.deltaTime is the amount of time that has passed since the last frame

[hushed shard]

oh... rlly?

so when i multiply that value by time.deltatime what does it do?

[shrewd ibex]

can something bad happen if I make it very small? because right now the ball mass is 0.001 and my player's mass is 1

[jovial wraith]

Think of it this way: after 1 second, your speed will have changed by 8 units.

[hushed shard]

yeah

also couldnt i just use mathf.clamp for the min and max value...

[jovial wraith]

multiplying by Time.deltaTime is like adding "per second" to the units of the thing you're doing

[hushed shard]

oh ok that makes sense

[jovial wraith]

yes, that would work too

[hushed shard]

oh ok ty

[jovial wraith]

try it out, see if you run into problems

[shrewd ibex]

it still get's pushed slow

these are the component of my ball

[desert wave]

well the thing is

the force is very weak

try using mass independent methods

[shrewd ibex]

Which other method would you recommend?

[desert wave]

well how are you doing it rn?

[shrewd ibex]

I’m moving my player on the x axis with mobile swipe moment and the fastest I swipe it’s supposed to push the ball further

[desert wave]

do you do AddForce(swipelenght)? @shrewd ibex

[desert wave]

try using acceleration here

[midnight glade]

I'm currently using different layers to sort out different elevations in my 2d game (elevation in my case could be different floors of a building but still remaining at the same translation, hence the use of layers).

Each Elevation use 3 layers each (view, player, collision).
Since I don't want the elevations to affect each other, I'm basically using the Physics2D.IgnoreLayerCollision between all the layers between all elevations. I was wondering if there's a "cleaner" way to do this, or if this is basically how it should be done:

        //Ignoring collision between elevations (no clue if theres a better way to do this lmao)
        for(int i = 0; i < elevations.Count-1; i++)
        {
            for(int j = i+1; j < elevations.Count; j++)
            {
                //Ignore elevation i player layer to all of elevation j layers
                Physics2D.IgnoreLayerCollision(elevations[i].playerLayer, elevations[j].playerLayer);

                Physics2D.IgnoreLayerCollision(elevations[i].playerLayer, elevations[j].viewLayer);

                Physics2D.IgnoreLayerCollision(elevations[i].playerLayer, elevations[j].collisionLayer);

                //Ignore elevation i view layer to all of elevation j layers
                Physics2D.IgnoreLayerCollision(elevations[i].viewLayer, elevations[j].playerLayer);

                Physics2D.IgnoreLayerCollision(elevations[i].viewLayer, elevations[j].viewLayer);

                Physics2D.IgnoreLayerCollision(elevations[i].viewLayer, elevations[j].collisionLayer);

                //Ignore elevation i collision layer to all of elevation j layers
                Physics2D.IgnoreLayerCollision(elevations[i].collisionLayer, elevations[j].playerLayer);

                Physics2D.IgnoreLayerCollision(elevations[i].collisionLayer, elevations[j].viewLayer);

                Physics2D.IgnoreLayerCollision(elevations[i].collisionLayer, elevations[j].collisionLayer);
            }
        }
    }```

At least it takes less space now, but it's a lot of IgnoreLayerCollision usages lmao

        //Ignoring collision between elevations (no clue if theres a better way to do this lmao)
        for(int i = 0; i < elevations.Count-1; i++)
        {
            for(int j = i+1; j < elevations.Count; j++)
            {
                for(int k = 0; k < elevations[i].layers.Length; k++)
                {
                    for(int l = 0; l < elevations[j].layers.Length; l++)
                    {
                        Physics2D.IgnoreLayerCollision(elevations[i].layers[k], elevations[j].layers[l]);
                    }

                }
            }
        }```

[jovial wraith]

Are you aware of the layer collision matrix in project settings? If you want these layers to never interact with each other, that's the way to do it

[midnight glade]

Do they include custom layers I manage through code too?

[jovial wraith]

yep, go check it out. https://docs.unity3d.com/Manual/LayerBasedCollision.html

[midnight glade]

Because I'm basically adding 18 more layers, so isn't clicking through all those boxes pretty much the same thing as Im doing with those 4 loops

[jovial wraith]

yes, it is. Is your complaint that you have to specify which layers collide with each other? you're going to have to do that somewhere

[midnight glade]

Thought maybe there is a method for the other way around

Like whenever a layer is created it is not interacting with the other layers

and that I could enable it for a specific layer

[jovial wraith]

nope, layers default to colliding with everything. If you want different behavior you have to specify it either like you're doing in your loops or in the project settings

[midnight glade]

Fair enough, thanks

[stuck bay]

is there some way to prevent the capsule from going in the other gameobject after giving it rigid body?

[desert wave]

well

if both have their respective colliders

and the capsule has a rigidbody

they shouldnt overlap

[stuck bay]

colliders?

[desert wave]

yes

the collider component

[stuck bay]

oh, what does the component do?

[desert wave]

it makes it register

collisions

similar to how a normal object

it has physical collisions

[stuck bay]

is it this @desert wave

[desert wave]

yes

[stuck bay]

well both of them have it, how could I adjust it to not let the capsule go in the other gameobject?

[desert wave]

repeating myself

they both need colliders

and one needs a rigidbody

if you have that they shouldn't go through each other

[stuck bay]

well the ground(grey platform) has a box collider & the capsule has a box collider + a rigid body and it is still going in

[desert wave]

change the capsule collider

from a box collider

to a capsule collider

[stuck bay]

Thank you it worked

[desert wave]

this channel is cold

[hollow topaz]

if my fixedupdate is running at 100fps (0.01) and vsync is enabled does that mean fixedupdate is actually capped at 60fps?

[hollow echo]

No, fixed update will run at the rate it's configured to. It will run multiple times a frame if it needs to

[hollow topaz]

ok, but how do I get around movement jitter?

[hollow echo]

Interpolate your physics bodies if required

https://www.kinematicsoup.com/news/2016/8/9/rrypp5tkubynjwxhxjzd42s3o034o8 goes over one solution if you're not happy with the interpolation settings on rigidbody

[hollow topaz]

thank you

[signal basin]

I'm having a hell of a time trying to smoothly follow a fast moving (~350 units/sec) physics object with a camera. The two normal approaches don't work for me, namely:
A) Move the camera in FixedUpdate. This results in the camera always being one physics tick behind the object, in addition to however behind it would be with the smooth/damping follow. This is because the Unity execution order will execute the camera follow script, find the target position based on the current object's position, but then the physics tick happens after FixedUpdate and before the frame is rendered (moving the object). So the camera is always one physics tick behind.
B) Move the camera in LateUpdate with the object's Rigidbody sent to Interpolate. This generally works well, but using the normal Vector3.SmoothDamp(current, target...) approach for a smooth follow starts causing jitter when I have a low smoothTime like .05 or so. Since the object is moving so fast, I need to use a small smoothTime or the camera lags too far behind. It seems to work fine for larger values though

Has anyone ran into/found a solution to these problems? I could try to dramatically increase the physics tick rate, which would mitigate the problem in A but I'd like to solve it (didn't have luck in #archived-code-advanced , moving it to here)

[desert wave]

Well have you tried Lerp?

Or why not use cinemachine

[signal basin]

I have similar results (jitter) with Lerp vs SmoothDamp for B. I could switch to Cinemachine but I'm not convinced there won't be the same problems. Using it in fixed update mode will still have the same issue with A, but maybe the way it moves the camera vs SmoothDamp will have less jitter?

[nocturne fern]

I'm confused...I'm writing a custom movement controller using a character controller.move function.

I've done this before in Unreal Engine. I was having really weird behavior where I would hold "W" to move my character forward and the character would move at a velocity of ~0.005m/s (basically not moving). After a COMPLETELY random amount of time between 1-20 seconds it would suddenly start working normally and the character would start accelerating towards max speed relatively quickly. If I let go of W and let my deceleration code make him stop and then try to go again, it would take a random amount of time before he actually started visibly moving.

What's weird is I just moved the code from Update() to FixedUpdate() and all of the sudden it works. Nothing I've read about FixedUpdate vs Update would suggest that this would happen.

I probably just dont understand FixedUpdate(). There's a lot of bad information like that FixedUpdate is somehow frame rate independent which...no loop is frame rate independent, that's impossible...

[undone harbor]

Hello guys! Does anyone know why collision detection between trigger colliders still occur, even though i have set collider layers not to collide in the Physics settings?

Oh, i forgot to mention that i switch layers of an object at runtime and i expect it to stop colliding with another one. Basically i have unchecked a layer collision with itself and switch from default layer to that

Should i manually update something in this case?

[undone harbor]

You can totally ignore that pointless riddle guys. That was an unnecessary suffering for me and i brought that to you. Soooo....sorry? I have just forgotten that i have that god forsaken collider on the child object and it just kept bothering me. Late night dev 😄

[desert wave]

its not impossible, but rather complex

every machine can run code
you can do certain things in certain time
and if one fails, you can do difference of times between them

or unity just calculates the fixed update and then runs it when neccesary

idk

[nocturne fern]

I just mean that when you check if its time to run a piece of code there's no guarantee that that time has not already elapsed

Like if it comes in at t=1.001s and its supposed to fire at t=1.000 its already too late

[desert wave]

unity most likely did something to prevent that

i think you can see unity's code and find how they do it

or google your question

[frigid pier]

You can find FixedUpdate in Unity manual, it explains in detail how it functions

[nocturne fern]

@desert wave I mean if you just check the time between fixedupdates it is not constantly 0.02. It just checks to see if 0.02s have elapsed and then it runs but that doesnt mean it runs at exactly 0.02

[frigid pier]

Which is also explained

You can select and right click it right here and search, it will take you there.

[nocturne fern]

Yea i've read through the docs. I still don't understand why I'm getting this behavior of my character stalling

[frigid pier]

Use FixedUpdate when using Rigidbody. Set a force to a Rigidbody and it applies each fixed frame. FixedUpdate occurs at a measured time step that typically does not coincide with MonoBehaviour.Update.

If you mix control of physics in Update, you'll get erratic behaviour.

Also should use Ridigbody methods and not properties to set physics objects

[nocturne fern]

@frigid pier I'm not using a rigidbody I'm using a character controller

[frigid pier]

What are you moving in and out of fixed update then? Controller has own methods.

[nocturne fern]

Controller only has methods to essentially teleport the object and handle collision if it were to run into something during the teleport. You have to write your acceleration/deceleration/movement code

[frigid pier]

You problem was with the camera shaking?

wrong post...

You need to take into account Input manager as well

[nocturne fern]

That's one of my common problems.

My current weird issue is the movement only goes at a velocity of ~0.05 until a random moment between 1-20 seconds where it suddenly starts working and accelerating like normal.

Camera shaking is always a concern with Unity character controllers because the character controller is supposed to be in fixed update but the camera updates need to be on Update(). This discrepency causes artifacts because the object is moving on different frames than the camera is rotating :S

[frigid pier]

Some keys have latency built-in

You can remove that

[nocturne fern]

I'm thinking in Unity the y rotation of the camera may need to be disassociated with the y rotation of the character. So the character operates on a delay simply matching the camera rotation every fixed update but the camera rotates in Update() seprately.

Other than that, I haven't found a way to remove camera artifacts or stutter

[frigid pier]

Here's a good guide for stutter https://www.unity3dtips.com/unity-fix-movement-stutter/

[nocturne fern]

Yea I've never actually used lerping. It's unnecessary in Unreal Engine but may be necessary in Unity because of the whole FixedUpdate() thing (unreal engine doesnt have this at all)

I'd like to avoid it because it seems like it bandaids the problem (makes it unnoticeable) rather than actually avoiding the problem but...

That page is pretty much just saying make everything scale with deltaTime. That doesn't address the camera - you don't even want to use deltaTime on the camera because you don't care how long its been since the last frame, only how much your mouse has moved since the last frame.

[frigid pier]

Just explains possible problems with it and usage not related to your case.

What you want to have is to move camera in LateUpdate, after everything has moved, then you won't see jittering. Also interpolation for physics enabled bodies

You should also run the build itself. In some cases running in the editor it always jitters (but not in the build)

[nocturne fern]

This is the problem I'm referring to with regards to camera stutter.

https://streamable.com/75x7vv

You can see there's no jitter when I just move the character or just move the camera but when I move both at the same time I get bouncyness

It almost looks like the cylinder is vibrating

[frigid pier]

@nocturne fern Yes, the camera move not in sync, read this ^^

[nocturne fern]

I'll try.

[frigid pier]

Don't forget moving camera in LateUpdate

[nocturne fern]

This is the build. Still seems very stuttery. Camera movement is in LateUpdate() https://streamable.com/lytjwx

This is the code. It's a pretty basic acceleration code https://codeshare.io/X8WOKo

The only way I've been able to not have camera stutter in Unity is to have the camera and character code both in Update() but now I'm having issues with the physics code if its not in fixedupdate

[frigid pier]

Examples say to move character controller in Update

keep camera in late

No idea how Character controller behaves with physics, never used it, and I assume it's not its purpose. If you want physics interaction create physics driven controller, it's not that hard, and with interpolation it won't jitter.

[nocturne fern]

Yea see that's what I was thinking - I don't know why the character controller would need to be in fixedupdate since if you multiply by time.deltaTime it's frame rate independent anyways

But I'm having a really weird issue where my member variable seems to get reset to 0,0,0 between updates. Update() doesn't try to run multithreaded does it?

Essentiallly I have

velocity2D = new Vector2(m_Velocity.x, m_Velocity.y)

[complicated code that increments velocity2D based on acceleration/deceleration/inputs]

m_Velocity = new Vector3(velocity2D.x, m_Velocity.y, velocity2D.y)

If I throw a debug log in there, I can see that the value I'm incrementing 2D by is ~0.02 (changes slightly depending on deltaTime). velocity2D ends up being EXACTLY EQUAL to the increment because it's also thinking m_Velocity is 0,0,0. So m_Velocity gets set to velocity2D which is now whatever the increment was (~0.02).

NEXT FRAME, it runs and velocity2D pulls from m_Velocity and it pulls in 0,0,0 again...even though it should have changed in the last frame???

I get the same behavior with three lines of code in update.... (excluding debug.log)

        Debug.Log(m_Velocity.x);

        velocity2D += new Vector2(.02f, 0f);

        m_Velocity = new Vector3(velocity2D.x, 0f, velocity2D.y);```

(Object NEVER moves.  But if I set 0.02 to a higher value like 1.00 it moves).

[stuck bay]

the default fps character (both) have stuttering when you walk and turn its very visible

im talking about standard asset , the ones you import as asset "Characters"

[nocturne fern]

Ah! I figured out the issue. It's actually this part of the code that I wasnt looking at

        Vector3 oldPos = transform.position;
        m_CharacterController.Move(delta);

        // Collision may cause disparities with our desired movement... Update velocity to reflect actual movement.
        m_Velocity = (transform.position - oldPos) / Time.deltaTime;```

This is kind of a problem though... fixing the velocity after a .Move is kind of necessary... but it seems the floating point precision is not so great...

But ignoring that yes - this does resolve the stutter if the character is updated in Update and the Camera is updated in LateUpdate

It seems like you should only actually use fixedupdate for objects that are responding to Unity's built in physics engine. Character controllers may use it's collision system but they don't move with the physics system

I'm actually curious whether or not you can even get a smooth rigidbody if you run it in fixedupdate. Normally you wouldnt want to use a rigidbody in a FPP and in TPP it wouldn't be as noticible if things werent perfectly smooth

Does .Move() perhaps have a minimum threshold where its like "Nah I'm not gonna move b/c that's too small a distance"?

AAAAAAAAND.....

Here's the culprit of the last 3 hours of my life.

The Unity docs actually say this value should be set to a value of '0'.... DESPITE THIS, it defaults to 0.001. Thanks Unity :S

[stuck bay]

https://streamable.com/ngf4cq

can I get some help on this

How could I make the tires not hang?

here are the settings for the joint

s*

[nocturne fern]

My camera almost feels too smooth. I don't feel like I can make snappy mouse flicks. My code is very simple. In update:

        Transform camTransform = transform.GetChild(1);

        transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles + new Vector3(0f, m_InLookVector.x * m_RotationScale, 0f));
        camTransform.localRotation = Quaternion.Euler(camTransform.localRotation.eulerAngles + new Vector3(-1 * m_InLookVector.y * m_RotationScale, 0f, 0f));```

In another script that handles reading input

```    public void OnLook(InputAction.CallbackContext context)
    {
        m_HumanoidMovementHandler.SetInLookVector(context.ReadValue<Vector2>());
    }```

[hushed shard]

I have a question. How can I increase my acceleration so my rate increases 3 per second until it reaches 20

I know the clamp thing

It’s just increasing by seconds

[nocturne fern]

Actually on this, it only happens in the editor, not the build. Not sure why the editor would make things feel smooth, maybe its just the renderer updating slower or something and not actually the camera. In the build, its as snappy as CS/Valorant/whatever

[nocturne fern]

What are we talking about? Increase the acceleration of what?

[hushed shard]

I have a speed acceleration variable and I set my speed equal to that

I’m trying to program the acceleration variable

[nocturne fern]

Also are you really wanting to increase the RATE of the acceleration? Or just increase the acceleration (which would increase the rate of the velocity)

[hushed shard]

Increase the rate

I think

I just want the acceleration variable to go from 1 to 10 in 3 seconds

[nocturne fern]

So in calculus terms velocity is the position dT. Acceleartion is the velocity dT. The rate of acceleration would be the acceleration dT.

[hushed shard]

Mhm

[nocturne fern]

So again I'm not sure whether you're talking about a rigid body, a character controller, or what but increasing the acceleration from 1 to 10 in 3 seconds is just like increasing the velocity from 1 to 10 in 3 seconds but with a different variable.

[hushed shard]

Yeah that’s what I’m doing

I have a character controller

I’m just trying to get an acceleration thing

I want my player to a. Flermet

*accelerate

[nocturne fern]

Well with a standard character controller that uses acceleration, the value of the acceleration does not change. The acceleration value changes the velocity depending on the time passed since the last change (but the VALUE of the acceleration value is a constant)

I'm not sure if you're just trying to do that or something different

If you just want a standard character controller movement, I can share my code of one I made. It's fairly complicated if you've never done it before. I made it like 3-4 times across a few different engines from scratch before I actually understood how it works completely. Essentially all you have to do is change the value of m_InMoveVector (which is the direction of the input) and then play with the public variables at the top to adjust the 'feel'. The way I have it, the player will reach max speed in 1 second (acceleration is 6m/s^2 and max speed is 6m/s), decelerate 4x faster, and change directions 4x faster. ProcessInput() is my acceleration/deceleration code.

https://codeshare.io/yoPJdl

Turn boost is the most confusing thing. You can comment it out to see what happens if you don't have it though - it essentially allows your input to adjust your direction more than it adjusts the magnitude of your velocity.

        float cosTheta = Mathf.Cos(gameObject.transform.rotation.eulerAngles.y * Mathf.Deg2Rad);
        float sinTheta = Mathf.Sin(gameObject.transform.rotation.eulerAngles.y * Mathf.Deg2Rad);

        Vector2 adjustedInMoveVector = new Vector2(
            m_InMoveVector.x * cosTheta + m_InMoveVector.y * sinTheta,
            -1f * m_InMoveVector.x * sinTheta + m_InMoveVector.y * cosTheta
            );```

Is some complex math where you rotate the coordinate axis to basically make the input vector relative to the direction the character is facing.  It's not part of the acceleration/deceleration code

[hushed shard]

Ok. Yeah idk how to do that since I haven’t taken physics. I just want my player to accelerate when moving to a certain speed

Idk how it works tho

[nocturne fern]

Sadly it's extremely complicated.

You can of course just set the velocity to either 0 or Movement Speed and ignore acceleration. Plenty of games throughout history have used this (It's referred to as Doom Controls). Otherwise, I would try to find a character controller that looks like you can drop it in your project. Unless you want to sit down and learn the math and physics behind it (which honestly requires a calculus level understanding of physics). The code I provided you does not even address gravity yet so its not complete.

And to replicate true gravity, I actually have used Differential Equations because true air resistance makes things really complciated, although most people cheat since most games don't need realistic air resistance.

The code for just the acceleration/deceleration is this. I do not believe it could be written in a simpler form. All this does is apply acceleration or deceleration depending on what's needed to variable called velocity2D

        if (velocity2D.magnitude > adjustedInMoveVector.magnitude * m_MovementSpeed * 1.01f)
        {
            //If our deceleration is greater than our remaining velocity, this means  we should set velocity to 0,0 to avoid overshooting
            if ((velocity2D.normalized * m_InputDeceleration * Time.deltaTime).magnitude > velocity2D.magnitude)
                velocity2D = Vector2.zero;
            else
                velocity2D = velocity2D - velocity2D.normalized * m_InputDeceleration * Time.deltaTime;
        }
        else
        {
            float timeScale = Mathf.Clamp(Time.deltaTime * m_InputTurningBoost, 0f, 1f);
            //Apply change to direction based only on turning boost
            velocity2D = velocity2D + (adjustedInMoveVector.normalized * velocity2D.magnitude - velocity2D) * timeScale;


            velocity2D = velocity2D + adjustedInMoveVector * Time.deltaTime * m_InputAcceleration;
            velocity2D = velocity2D.normalized * Mathf.Clamp(velocity2D.magnitude, 0f, m_MovementSpeed); 
            Debug.Log(velocity2D.x + " " + Time.deltaTime * m_InputAcceleration * adjustedInMoveVector.x + " " + m_Velocity.x);

        }```

[hushed shard]

Is this bad acceleration

Adding a value by a certain value times deltatime until it reaches a max velocity then I clamp it

Is that a bad way of implementing acceleration

I just want my player to simply accelerate

[nocturne fern]

The code I most recently posted is the bare minimum just accelerate/decelerate. (no gravity implementation, the character floats in the air).

You need to code acceleration and deceleration, and branches to determine whether we should be acceleration or decelerating. Once you have that, you'll have an interesting problem where your character slides around the floor like he's on ice. To address that, you need to add something called a turn boost.

If all you do is increment your member variable (velocity) by a constant (InputAcceleration) times time.deltaTime... Yes this will cause your character to smoothly accelerate towards that speed. He won't be able to slow down or change directions though. Also when you clamp you need to essentially get the .magnitude of the vector and clamp that and then multiply it by the .normalized. You can't just clamp the vector directly.

IE to clamp velocity2D = velocity2D.normalized * Mathf.Clamp(velocity2D.magnitude, 0f, m_MovementSpeed);

Since you said you haven't taken physics...just some general math knowledge...

A vector is a magnitude AND a direction. 2,2 is a diagonal line from the origin up and to the right to a point (2,2)
The magnitude (size) of the vector is sqrt(2^2 + 2^2) = 2.828
The normal is essentially a vector with a magnitude of exactly 1 that indicates the direction. In this case it would be (0.707, 0.707) because those numbers squared times each other square rooted equals 1

Thus, a vector can be found my multiplying the magnitude, 2.828, TIMES the normal which is (0.707, 0.707) which equals (2,2) since .707 x 2.828 = 2.

[granite vapor]

How should mesh collision be setup for players using rigidbodies? To be specific, i'd like to know if my method is acceptable, that is, to use a box collider for player collision and a mesh collider for everything else (throwable objects, bullets, ecc...) This would mean two extra layers, one for normal collision and one for player collision

[shadow seal]

in theory that works

but I really don't think that colliders on bullets are necessary

I dont know the performance cost of using mesh colliders extensively

[shell adder]

are you going to have the mesh collider on the player or on everything other than the player

performance wise using too many mesh colliders is not the best

[granite vapor]

It seems I was misunderstood, let me make an example, let's say I have a giant boulder, or a table, or anything really. A box collider would be enough for player collision, but if i have a throwable object like a ball i'd also like for it to correctly collide with the rock or boulder or whatever mesh it is. This is not about object colliding with a humanoid form.

[granite vapor]

Pinging you too so you can see what i replied.

[shell adder]

i don't know if having two colliders is going to be better than having just one

if you can, minimise mesh colliders and try to use combined primitives instead

if you put an rb on a parent object, all colliders on all children of that parent act as one composite collider

although if you disable layers for certain detection between the mesh and player then that could save performance (?) not sure

[granite vapor]

I see, so for example using a bunch of primitives is going to be always better than a single mesh collider? I think i can live with that, just going to be more annoying to setup

[shell adder]

yeah most of the time

depends on how many faces on the mesh and the number of primitives used

[shell adder]

if it gets too annoying and you haven't actually noticed any performance issues, then it may not be worth it

prioritise getting it to work over performance

[granite vapor]

Yeah I will, thanks, I come from years of modding a FPS game where everything is basically a mesh collider for everything but the player and i've been spoiled

[slate lily]

how can I run update and make it occur at the same time as fixed updated cause fixed update sometimes doesn't get called at its suppose time

anyone have a suggestion?

[waxen edge]

What do you mean by FixedUpdate not being called at the supposed time?

You can change the interval in which FixedUpdate is called in the Project Settings, maybe that can help, I doubt that you actually want Update to be called at the same time as FixedUpdate, what's your problem with it?

[verbal karma]

that's the way it's supposed to be, why do you want fixed update to be called at the same time as update?

[timid dove]

Update gets called once per frame. You can't change that and if you did change it it would break everything.

[slate lily]

k then how can I improve fixed update without consuming performance

[inner thistle]

Sounds like an XY Problem extraordinaire

What's the issue you're having that you're trying to solve?

[timid dove]

"improve" it how?

[slate lily]

That's why iam askin

[timid dove]

What are you actually having trouble with

Reading input?

[slate lily]

no performance when I made fixed update timestep to 0.0025

Works as I want but the performance is bad

[timid dove]

What is "how you want"?

[slate lily]

no jitter and check almost all time for the steps

[timid dove]

To fix jitter you enable interpolation on your rigidbodies

Not sure what "check all the time for the steps" means

[slate lily]

It's custom character I use rigidbody only for collision detection

checking for steps or bumps on the ground

[timid dove]

You can use things like capsulecast or spherecast instead to check for obstacles continuously along the path your object moves

[slate lily]

I do that but sometimes it doesn't detect that why I made fixed update to 0.0025 and now it works but the performance is bad

[merry spruce]

hi! what do i do when my character and enemy falls down on my platform?

[shell adder]

is the issue that you don't want them to fall down from the platform?

[merry spruce]

No. The issue is that i want them to step on the platform but tehy keep falling

[shell adder]

that's.. what i meant

[shell adder]

do you have a collider on the platform and characters

and do they have rigidbodies

[shell adder]

none of those are a collider

you'll need a collider2d

[merry spruce]

Thank you

[fringe leaf]

I don't know where to ask this, but I believe this might be the right place for it? I've implemented a floating origin system to allow me to increase the scale of my game, but I of course still see the warning I attached below for all the objects that are offset by more than ~12km from origin. This is safe to ignore right? As long as I'm not getting the warning "Invalid world AABB, Object is too far away from origin", I'd imagine there's no issue, as the objects are far enough away that they won't interfere with gameplay. Thought I would double check, as I'm unsure if this is an acceptable way of handling these floating point precision problems I'm having.

[sonic orchid]

im having some trouble with physics

so i have some gameobjects with cube colliders and rigidbodies

when i put some more they start moving and eventually collapse

is there some way to prevent this?

[fringe leaf]

You can just set them to be kinematic if you need them to be rigidbodies

[sonic orchid]

i want them to move

like fall and stuff

but when i put them like that

they start pushing each other

like sliding

and then collapse

[shell adder]

maybe increase the friction on their material?

or decrease the gravity

[sonic orchid]

its already like 100000

the friction

i changed the gravity too and it does the same

[sonic orchid]

it seems like they do that when i put something with the same mass or more on top of it

but when i put something with lower mass on top of something with higher mass it doesn't

[shell adder]

if you're in 2d you can reduce the gravity scale

[sonic orchid]

im using 3D colliders and rigidbodies in 2D camera

with locked z axis

[shell adder]

is there a reason to or

[sonic orchid]

i don't know why i did that but now there is alot of stuff and they have the 3D rigidbody

[shell adder]

oh

well changing to 2d is just changing the components to their 2d equivalents

[sonic orchid]

some of them have colliders based on the Z axis

so i need to fix it in 3D

[shell adder]

if that's too much then you can disable gravity, and change the decrease in velocity.y in script to be smaller the higher up the box is

[sonic orchid]

i though of a same idea but changing the mass based on how high is it, would that work?

ill try it

[shell adder]

gravity is the same for all objects regardless of mass?

unless gravity works differently in unity but i don't know

[sonic orchid]

yeah but the objects stops slidding on each other when i put something with lower mass on top of something with higher mass

so i though it might work

[shell adder]

that's because higher mass means more force is required from other objects to move them

not to do with gravity

[nocturne fern]

.08 is the default skin width for a character controller but being .08 off the ground is fairly noticible. Is there anything wrong with using a lower value like 0.01 or are you supposed to just make the capsule smaller than the mesh so that the capsule is raised .08m but the mesh is leveled with the ground?

[sonic orchid]

i chose to make the game 2D as i fixed the issue that required 3D to work, but now for some reasons 2 objects with 2D rigidbodies won't follow its parent

do you know whats causing this?

this is the object

i moved the parent and its not following it

[shell adder]

is the child dynamic?

[sonic orchid]

yeah

[shell adder]

dynamic rb's don't follow their parent

it'll have to be kinematic

[sonic orchid]

ohh

it works now but i want it to also rotate, it doesn't while kinematic

ill add a script that resets its local position

thanks for the help

[frosty flint]

I'm trying to add cloth physics to a character's clothes. but this happens..

[trail leaf]

So I've set up active ragdoll animations on one of my scenes to follow particular animations.
Is it possible to have half of the avatar be active ragdoll and the other half to be running off the animations?

For example, I want the animations to drive the movement of the character via the legs using an animator controller, but I want the upper half of the body to do active ragdoll animations.

I've already tried using avatar masks to only apply the animations to the lower half of the avatar, but that just leaves the upper half not responding to changes to the angular drive of the configurable joints

wasnt sure which chat to post this in tbh

[sonic orchid]

i need help with 2D colliders

so i have this rocket

when it hit something from the right or left side it explodes

but when it hits something from the other object's bottom side it doesn't

what causes this?

im using 2D colliders and 2D rigidbodies

[shell adder]

how many colliders do you have on the object

[sonic orchid]

on the rocket there is many on the top (to match the pixels) but the trigger ones that causes it to explode is only 1

if the top of the rocket hit on any other side other than the bottom the trigger would count

[shell adder]

'other than the bottom' of what

[sonic orchid]

like there is 4 sides of an object, it would count it as trigger if it hit lets say the right, left or top side of the wall but if it touchs the bottom side of the wall the trigger won't count

when i disabled gravity on the rocket it exploded on bottom

it does that when gravity enabled (on the rigidbody)

ill use it without gravity for now, sorry for the question

[shell adder]

are the child rigidbodies on the bottom?

[sonic orchid]

it has a box collider 2D

[shell adder]

i don't understand sorry

[desert wave]

Do you need triggers or can you use raycast?

[sonic orchid]

i fixed it by disabling gravity

im guessing it was gravity related (the gravity was 50 to make objects fall faster)

[pine narwhal]

How can I make all Children of a prefab in Unity have the same pivot point as the Parent?

[pine narwhal]

Nevermind I just added new pivot points Based on the Parent

[lethal wyvern]

Can Someone please help me with this raycast thing here ... i have used all three updates and tha raycast is still not stable

[dreamy pollen]

I have no idea if this is the correct place for this. Would it be more performant for this shape to be composed of many convex colliders, or the one concave one that Pro Builder generates?

Or perhaps a bunch rotated box colliders? That sounds hellish. Not sure why you can't rotate box colliders without putting them on a bunch of game objects...

[timid dove]

probably the single concave one, assuming it's a static object

[dreamy pollen]

yeah concave

[ancient coral]

I currently experience an issue with my custom 3d Objects clipping through other objects.
I'm not sure what's causing it since I think the colliders are set correctly.

this is what it looks like

it only clips the wall, but can't go through it entirely

[shell adder]

do you have code for movement?

and what modes are the rigidbodies in

[ancient coral]

yes I have code for the movement

[shell adder]

can you show that

[ancient coral]

there are no rigidbodys because they break the movement

[ancient coral]

in a minute

[shell adder]

so how are you detecting collision then?

[ancient coral]

only colliders

[shell adder]

without rigidbodies, unless you have code to detect and stop collision, then collisions won't work

[ancient coral]

the code for the movement if interested

[shell adder]

#854851968446365696 for how to post code

[ancient coral]

they work that's not the issue

[ancient coral]

sry

[ancient coral]

just not completely

[ancient coral]

https://gdl.space/sabeneremi.cs

is this better?

[shell adder]

oh you're using character controller

i've never used that before sorry

[ancient coral]

no worries

I'm also quite new to unity

[shell adder]

one of the other code channels could help since this isn't necessarily physics

[ancient coral]

kk

thx for your help

[trail leaf]

Im having a bit of trouble getting a ragdoll with configurable joints to face the direction I want.

Its currently set up for each of its body parts to have its target rotation set to that of the local rotation of that body part on an animated model.

I want the ragdoll as a whole to face towards the player.
Updating the parent object of the ragdoll does not affect the rotations of the ragdoll.

So Im thinking I need to multiply the current target rotation of the root object of the ragdoll by some rotation around the global y axis to make it face the player while also mostly preserving local rotations

However I am not good with quaternions

Am I on the right track or is there some easier way to do this

[trail leaf]

got it after writing it out haha

[timid dove]

your problem is that CharacterController only considers itself for collision detection when moving

When I say "itself" - CharacterController is a capsule-shaped collider

No other colliders on the character will be considered

[elder dune]

Hello ! I'm trying to make a laser sight with a line renderer and raycast but here is what i got
so i tryed with 2 raycast
1 : from the camera to the center of the screen and get the hit.point.
2 : from an empty Go on the player to the hit.point
But the second step dont work at all and the hit goes hell
then i set the line renderer point

Then with the second raycast :

The goal is to make the laser stop if it hit an object and not go through

[desert wave]

ok so

use a [Serialazable] Layermask

and set it in the inspector

then do a raycast that uses that layermask

then set the linerenderer.Setposition(1, raycast.point)

now beware of where to shoot your raycast

from the player object forward direction, or the camera center

[timid dove]

Can you elaborate on "But the second step dont work at all and the hit goes hell"

[polar estuary]

How would i make puppetmaster follow my character faster? my character moves pretty darn fast so once i run and stop suddenly the character goes flinging but it doesnt come back. Any way to fix this? Im not very sure how to explain this very well.

[sinful oyster]

Hello guy's 👋.

I don't know why my cloth system is not working!?

It's in play mode.

And it's the values.

[tender gulch]

Did you paint the rigid/simulated areas?

[elder dune]

Excuse me @desert wave but i think i didn't understand your explanation but nevertheless, i fixed my problem 😬
So i used 2 differents raycast
1 from the camera pos to the center of the screen ( screen one ) and i also use this one for shooting ( currently )
Then a second from a GO ( "the gun" ) to the RIGHT DIRECTION. And this where i failed.
Because my second raycast had for direction the hit.point from the first raycast ( 2nd screen ). But then i realiszed my mistake ^^'
So now the second raycast come from the startPos to the v3 hit.point - startPos.position in order to get the direction
And it work. So it was all of my bad and i tough the Physics.Raycast(startPos, Direction, ...) where Direction mean the endPos
Now i would like to see if its to possible to hit the SkinnedMeshRenderer and not colliders ( from the ragdoll )
Thank you anyway for you time

[sinful oyster]

Yeah I did.

[bleak robin]

Hi everyone! I am currently working on creating a rope sytem in Unity using Verlet integration. Getting the rope simulation was simple enough, I am however having a harder time making these ropes interact with rigid bodies (to make a pendulum with a weight on one end for example).

I had some success applying spring forces to bodies that are bound to the rope, which work fine for an elastic rope, but not as an actual rope.

Has anyone had any experience with this? What was your approach to make a rope that can interact with Unity's physics engine?

BTW I'd be more than happy to setup a github repo if anyone wants to contribute or simply use what I already have

[jovial wraith]

I know this is not a particularly helpful answer, but Sebastian Lague recently used Verlet intergration in a video and literally says in his video "getting this to interact with anything other than the floor is too much of a headache, so I'm not going to do it." https://www.youtube.com/watch?v=PGk0rnyTa1U

[bleak robin]

At least I know I'm not missing some obvious solution! But getting an elastic rope to work with unity rigid bodies wasn't that hard, I was hoping that it would be the same for a regular rope

[tight bone]

just a simple question but is there a way to make like a swimming script without having to use a rigidbody component

[bleak umbra]

You mean without simulated physics (forces & collision handling)?

[tight bone]

yeah cause im trying to have the feeling like you in water but without the rigidbody component cause when i add it on the player it make the character act different

[bleak umbra]

you can set it to kinematic, then you can do all the movement with custom code

[tight bone]

do u understand coding?

like could i send you what i have and you could maybe help me add to it to get what im trying to do

[bleak umbra]

without code you are stuck with the builtin buoyancy component and store assets

[bleak umbra]

won’t code for free

[tight bone]

im just trying to get help i just have a few ideas on what to change but not sure if im on right track

[bleak umbra]

but you can get help for learning how to code in #💻┃code-beginner

[bleak umbra]

If you post what you have here, together with a specific question you will get help

[bleak umbra]

#854851968446365696

[tight bone]

sorry i know it was too long

[bleak umbra]

don’t post files if at all possible

[tight bone]

but if i was to change the value of the gravity do you think it would give the feel of being in water

it was a msg that went to files

[bleak umbra]

It’s inconvenient for people who want to help

In that readme is a guide how to post code/formatted text

[tight bone]

https://pastebin.com/hMAwtfW6 if i put there so could read would this help

[bleak umbra]

There is no(minimal) gravity in/under water. Or rather Buoyancy is inverted gravity while underwater

[tight bone]

so lowering it would give the effect of water then right?

[bleak umbra]

partially

for a submarine, yes

For a swimmer/boat, no

[tight bone]

but wouldnt a swimmer float for a little then slowly sink if they stop swimming

[bleak umbra]

floating (as in swimming) needs gravity+buoyancy to work together based on some input

upAcceleration = gravity + gravity * buoyancy * -1 * isInWater01

[young coral]

Is there a way I can make a donut shaped collider in 3d? every collider, including using mesh colliders, seem to miss the center piece

[lapis plaza]

if it's a static mesh, you can just use mesh collider

otherwise, you'd typically use compound collider (combine multiple colliders in circle shape to get that result) if you really need the center have hole in the collision

@young coral ^

[young coral]

thanks 0lento, editing the mesh on the fly so the embedded colliders doesn't work unfortunately, running into issues oblong shapes or shapes with holes

i'll figure something out, makes sense it's not a built in thing, appreciate the feedback

[honest granite]

im shooting a rigidbody bullet into an enemy with rigidbody, when the bullet hits the enemy starts spining, how to fix it?

[timid dove]

I guess you could constrain the rotation of the enemy's rigidbody

but that's just how physics works

You could also make your bullets use trigger colliders so there's no physical collision

[honest granite]

hm

ok

tnx

ill try it out

[hushed shard]

Does anyone know the simplest way to make a trajectory line

[swift raft]

I need to make a physics engine with voxel blocks

Like all sharp edges

The players collider has to be a 0.6 x 1.8 x 0.6 cube

And I have no idea how to do this

[swift raft]

Anyone have any ideas?

[viral ginkgo]

@swift raft Its tough subject

I think the toughest part is rendering the voxels

Generating the geometry I mean (In a way that it doesn't burn your cpu/gpu)

If you can have that going, then it's cylinder-cast against mesh
(I get it that you don't wanna use default physics)

[swift raft]

What do you mean by that? If you mean the actual rendering, that can be done by script-generated meshes, which I’ve already done, if you’re talking about physics geometry, idk

[viral ginkgo]

@swift raft Everytime you break a block, you redraw some part of the mesh

That's a cost

You need to have the chunking going on no matter how big is your world

I wasn't talking about gpu stuff I mean
You just gotta simplify the mesh as much as possible

Minecraft uses some algorithm called greedy meshing

You could also just draw quad by quad and not draw the quads that are obscured by neighboring voxels

[vagrant comet]

how can I alternate between multiple PolygonCollider2D shapes for a single GameObject?

this gameobject changes its sprite to become a new enemy but the polygon collider 2d needs to take that sprite's shape

preferably a shape that I edited already to have more accurate collision

[shell adder]

you can have prefabs with polygon colliders on, which you can edit before hand
then create fields of type PolygonCollider2D and assign each prefab to a field
you can then call GetPath on the prefab collider, and use that array for SetPath on the GameObject's polygon collider

[swift raft]

I know that, the world is split up into 16x8x16 meshes so it won’t make pretty much any lag when breaking a block, and I don’t draw obscured sides

[vagrant comet]

how do I quickly delete a point on a polygon collider 2d?

[weak peak]

Does physics engine behaves differently when the game object dimensions are small ?
i.e collision acts weirdly or objects stuck into another object....!?

[swift raft]

Yes, because of floating point number precision errors

[zenith remnant]

does anyone know how to properly use Hinge Joint in order to replicate a swingset? I cant for the life of me understand it
my goal is to have the swings just slowly moving about (as if the wind is blowing on it)

[timid dove]

apply an intermittent force to the swing in your code, as if the wind is blowing

the swinging will happen automatically assuming the hinge joint is set up properly

[shell adder]

you can have a collider at that offset, and oncollision events you can call whatever you'd like on the original collider

whether that be syncing the velocity or triggering an event

yeah basically

you can duplicate the original

have a prefab that you instantiate

is the dummy going to be visible

well i'm not sure there's going to be another way

to detect collisions you'll need a collider

you can relay the animation calls to the dummy's animator, and same goes for any other thing like being destroyed

if you have multiple dummies then you can use events and have the dummies add listeners to the main object's event

[timid dove]

you can put colliders wherever you want. They don't have to match up with the visible portion of your object.

[civic field]

Someone knows how to do an infinitely swinging pendulum that always keeps its trajectory

my best guess rn is to find the correct amount of force to get it to where I want and then reset velocity and do the inverse of that

[regal pecan]

If i were to make a vr game, that has space physics, as in you float and move my grabbing and flying, how could i make space stuff?

[civic field]

wdym by space stuff ? if you mean low gravity just change that in rigidbodies

[regal pecan]

Well i have never made a game before, 1000% noob here

[civic field]

then the best advice i have is to start smaller

aim for something achievable by a beginner then go from there

[regal pecan]

any ideas?

[civic field]

Simple platformers, simple shooter etc..

it's really up to you what you want to make

[regal pecan]

i see.

[civic field]

there are tutorials on how to make anything online

[regal pecan]

okay then

c ya i guess

[civic field]

good luck man, the beginning is the toughest part

[regal pecan]

i cant even download it

on a 2 terabyte storage

[shrewd ibex]

Hi guys, I'm making a 3D mobile game where I will have around 300 balls per level with a sphere collider and a rigidbody for them to react when the player runs into them. Do you think that having 300 objects with collisions and rigidbody's could cause performance issues in a phone? Or I would have to worry about this if I had way more objects?

[timid dove]

Try it out and see

[stuck bay]

Good day, I have an issue with my player model where it freaks out and goes hyperspace or clips right through the ground, I've checked scripts, removed colliders, changed their values, etc. but I just can't figure out what causes it.
I've went into more detail here https://forum.unity.com/threads/the-player-vehicle-moves-extremely-fast-at-seemingly-random-times.1188361/

[frank shore]

can i use rigidbody and character controller at the same time??

[daring furnace]

it's not recommended and not meant to be used at the same time. pick one

[frank shore]

ok thanks @daring furnace

[timid dove]

you can use a kinematic rigidbody with a CharacterController. Not a dynamic one

[verbal bolt]

Hey folks!
I'm working on a project where I need 2D colliders for purely raycasting purposes. There's potentially very large numbers of objects with PolygonCollider2Ds in the scene at once, and if things overlap I tend to get physics2d.findnewcontacts occurring way too much.

I'm currently using Rigidbodies to move everything around (rigidbody.position =), as there was a lot of lag being introduced by using 'transform.position =' on an object with a 2D collider.

Is there a way that I can completely disable all collisions but keep raycast functionality? I've already tried unchecking hte entire collision matrix, and using Physics2D.IgnoreCollision. If I can at the very least stop a Rigidbody2D from calculating contact points amongst its children, that would be a big step up.

I should also mention that setting the colliders to triggers doesn't solve the problem either

[timid dove]

Using the collision matrix should work fine, assuming your objects are in layers that don't interact with each other. What went wrong when you tried that?

[desert wave]

@verbal bolt

[carmine robin]

I have a novice physics question. I'm experimenting with various ways of simple character movement, and the method I'm using causes the character to stutter as it moves a ridiculous amount. The movement overall is consistent, over a long period of time, the movement averages out to being fine, but it looks VERY staggered. I'm very obviously missing something.

    void MoveShip() //Called on FixedUpdate
    {
        Vector2 targetVelocity = new Vector2 (Input.GetAxis("Horizontal"),Input.GetAxis("Vertical"));
        targetVelocity = (targetVelocity * speed) * Time.fixedDeltaTime;
        rb.velocity = targetVelocity;
    }```

I'm assuming it's how I'm directly updating the rigidbody velocity values directly, but I was looking into some example code online and almost all of them used some method like this to directly change the value of velocity, so I couldn't figure out what I'm doing wrong

What am I missing here?

[subtle axle]

Enabling Interpolate can help when using this style of movement

[carmine robin]

This is how I have it set

I could record a GIF of how it looks when I try to move. It's really bad looking.

Not taking into account the obvious visual stuttering, it moves quite smoothly and interacts with the world just fine, but it looks and feels horrible

[subtle axle]

Hmm im not too familiar with 2D...I'm assuming your timestep is at default...that mass looks really small - have you tried increasing it?

[carmine robin]

Hmm, I haven't. My goal originally was to use my own movement system without forces or velocity, but that changed. I'll try messing with that value.

Nah, I changed it to 10 and 100 without a change.

Is there nothing inherently wrong with the code then?

If the code should be working, in principle, I can look deeper at other factors rather than spend my hours trying to revise the code. I've already spent hours re-writing it in a few ways only for all of them to come to the same conclusion; it stutters like hell

I just thought it was because I was editing RB's velocity directly, but that appears to be how other people do it

... ok it was actually the Interpolate option

By setting it to anything but interpolate, it runs perfectly smooth

I'm very curious as to why that is, but for the moment I'm just happy it wasn't because of shitty code

[tough geyser]

Hello, is there a way to visualize or list Physics Exclusions? I have an issue in which 2 colliders start ignoring each other but nothing on them has changed, they are in the same layers, all attributes are the same. Im guessing some script might have called Physics.IgnoreCollision on one of them to ignore themselves but I don't know how to find out about this. I appreciate any help.

[verbal bolt]

It's still calling the FindNewContacts even with the collision matrix effectively disabled

[timid dove]

See what happens if you remove Rigidbodies from the objects

[verbal bolt]

That solves the contacts issue, but then I get even more performance issues because it recalculates the collider positions every frame if you just set transform position directly

[timid dove]

what kind of objects are these

what are you trying to accomplish

[verbal bolt]

Mostly SpriteRenderers with 2D polygon colliders attached

[timid dove]

right but

what are they

what do they represent

[verbal bolt]

Ahh

[timid dove]

what is the gameplay you're trying to create

[verbal bolt]

It's a tabletop mapping software

[timid dove]

So are you trying to make playing cards or something?

[verbal bolt]

More like maps for DnD

I'll send you a trailer that shows what it's all about. 1 sec

https://youtu.be/qqskeR1pguQ

For the most part it runs really well. It's just when there's a large number of objects overlapping that the issues crop up

The colliders are purely used for raycasting, both to select content and lighting. We don't need any actual physics simulation

[timid dove]

hmmm

As painful as this might be - Unity's physics might be overkill for your use case.

[verbal bolt]

Yeah quite possibly. The idea has crossed my mind that I may need to write a custom system for it

Luckily at the moment it's more of an edge case than anything, but I definitely reckon in the future I'll have to bust out a custom collider and raycasting system

[timid dove]

Another possible option... The 3d Physics engine has more configuration options than the 2D one

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

[verbal bolt]

Just wish Unity gave us the ability to decide how much of the simulation everything interacts with

It does. I'm not sure the mesh colliders work with sprite renderers in the way we need though unfortunately

[timid dove]

it's also a completely different engine that might just... perform differently

[timid dove]

You 're right they don't - you would have to do some custom thing to turn a sprite into a Mesh for MeshCollider

which honestly is not that terrible

I actually wrote something like that for a project recently

[nocturne cipher]

I think blender offers some level of control

[verbal bolt]

Oh, convenient haha

[nocturne cipher]

Dunno though, haven't simulated much in either aside from FPS stuff

[verbal bolt]

At this particular point in the project, I'm not gonna risk going through and changing everything to a different physics system.
Thanks for the help anyway. It's good to confirm that what I need isn't possible out of the box. Gives me some solid plans of what to look into for the future 😊

[nocturne cipher]

There might be a plugin for it

[carmine robin]

void MoveShip()
{
    Vector2 input = new Vector2(Input.GetAxis("Horizontal"),Input.GetAxis("Vertical"));
    // If moving diagonally, reduce velocity down to 71% on each axis
    if (Mathf.Abs(input.x) == 1f && Mathf.Abs(input.y) == 1f)
            {targetVelocity = input * 0.71f;}
    else    {targetVelocity = input;}
    // Add impulse velocity after all normal movement. Impulse is currently always zero.
    targetVelocity = (targetVelocity * speed) * Time.deltaTime;
    rb.velocity = targetVelocity + impulse;
}```

I'm currently using this basic movement code, and it gets the job done. A basic rigidbody (rb). The problem is the player character feels way, way too "floaty". I've tried mass from 0.00001 to 100.0, I've tried setting drag to 0, 10, and 1000 and adjusting the speed values to compensate

None of it helps. I'm trying to make it feel like old arcade games; instant movement, instant deceleration.

I feel like I have no control over the movement values using a rigidbody. I still plan to have physics-based movement in a few situations in the game, but I would at least like the player's movement to feel extremely snappy and responsive and I cannot achieve that.

I've googled this, I've looked up examples, but none of them cover this.

What can I do to achieve snappier physics? Are there any examples or functions I can look into to provide a more responsive and adjustable method of movement

my understanding was that setting velocity directly should give a result instantly, but that is not the case. I can't figure out why not.

[desert wave]

https://youtu.be/7muhRz9ov_Q

you could look at this dev log

he recreates and talks about floating

[carmine robin]

I will check it out.

I'm finding it shockingly hard to create just... very bad feeling physics; like non-existent physics. I want to make it feel like a SNES game basically.

Unfortunately, he doesn't quite cover what I'm looking for. I'd already seen the Brackey's tutorial and even watched that entire GDC talk that he made fun of in the beginning.

I just can't figure out why changing velocity directly, one frame it's 0, the next frame I tell it to be 20, and it still ramps up as the key is held, and ramps down when I let go.

Man, Unity is great, but their 2D API is just shit sometimes.

They don't have Impulse mode for AddForce, the 2D rigidbody physics performs like ass

and I can never get any help because nobody else uses it. Just gonna scrap it and remake it all in 3D on a flat plane.

pales in comparison to GMS's 2D physics

[desert wave]

It does

You can increase the gravity to fall faster

Changing the mass won’t affect gravity itself

[carmine robin]

In this case, it's top-down with no gravity

I just want it so when you hold a button, the character moves from a standstill to full speed, and letting go stops the character immediately.

This is apparently impossible to achieve using 2D rigidbody, I've been reading about it all day and trying various solutions.

obviously I can directly change the transform values but I'd like to avoid that. I was told that altering the velocity values directly will achieve the result I want.

I'm not finding that to be true

[desert wave]

Well that is supposed to be true

[carmine robin]

It was in all my previous projects as well, I've examined their code, along with all the examples I can find. The only difference is that in every example and in my previous projects, they're using RigidBody and not the 2D version of it.

I can't figure out what mistake I'm making

[desert wave]

Well I do that in many projects I made

And seemed fine

Can you send the code when you try it

[carmine robin]

yeah let me trim it back

    void MoveShip()
    {
        Vector2 targetVelocity = new Vector2(Input.GetAxis("Horizontal"),Input.GetAxis("Vertical"));
        targetVelocity = (targetVelocity * speed); //* Time.deltaTime;
        rb.velocity = targetVelocity; //+ impulse;
    }```

MoveShip is called on fixed update

[desert wave]

https://www.google.com.mx/amp/s/stuartspixelgames.com/2018/06/24/simple-2d-top-down-movement-unity-c/amp/

Ok so you need your code or be like that

Im sorry but I can’t help you rn, maybe in some hours later, I’m gonna sleep and need to charge my phone

But gl

[carmine robin]

This is exactly the code I'm using. I even have the diagonal modifier code in there.

and I am not getting these results. Wtf am I missing?

 void MoveShip()
{
    Vector2 input = new Vector2(Input.GetAxis("Horizontal"),Input.GetAxis("Vertical"));
     // If moving diagonally, reduce velocity down to 71% on each axis
    if (Mathf.Abs(input.x) == 1f && Mathf.Abs(input.y) == 1f)
            {targetVelocity = input * 0.71f;}
    else    {targetVelocity = input;}
    // Add impulse velocity after all normal movement. Impulse is currently always zero.
    targetVelocity = (targetVelocity * speed); //* Time.deltaTime;
    rb.velocity = targetVelocity + impulse;
}```

[desert wave]

Check the Rigidbody settings

[carmine robin]

I have tried these at quite a few values. I've tried interpolation and extrapolation, I've tried drag, I have tried mass at 0.00001, 1, and 100

I tried each body type, and tried using a material

Nothing is changing how the player moves. It still accelerates and slides when I let go of an input.

SHIT it's the god damn input system. The new input system is artificially ramping my keyboard input

Fuck. I've been screwing with this for days thinking my code was wrong. God damn Unity.

[timid dove]

This is the old input system

And yes GetAxis has some "momentum" to it. Use GetAxisRaw if you don't want that

[carmine robin]

Noted, ty.

[steep oar]

Hey I was wondering how to get rid of the speed change when using controller on a rigidbody controller. Only moving the stick a short distance will make the character go too slow, I'm sure it has something to do with the magnitude im using to get the direction but not sure how to fix it

[timid dove]

"when using controller on a rigidbody controller" what does this mean? Can you be more specific? What do you mean by "speed change"? You mean acceleration?

[steep oar]

Sorry, when using an xbox controller, or any other one with a joystick, moving the analog stick just a bit will allow the player to move at a slower speed than the one I've set for it. My character has a rigidbody and I am using that to move it.

[desert wave]

if you are using input.getaxis

be sure to use the correct one

[steep oar]

I'm currently using GetAxisRaw

[desert wave]

Input.GetAxis returns a value from -1 to 1
Input.GetAxisRaw returns -1, 0 or 1

[steep oar]

I saw this on the wiki but even on Raw it is smoothed out when using a controllers joystick

[desert wave]

https://answers.unity.com/questions/679979/why-is-inputgetaxisraw-not-returning-whole-numbers.html

well it seems it is not as expected

[steep oar]

Ah, I see, that helps, thank you.

[jovial wraith]

Mathf.Sign(Input.GetAxis()) will give you input that is always whole numbers, as well. Pretty much the same as the stuff in that post under the hood

[steep oar]

Yeah that's what it looked like, thanks

[radiant gorge]

I was doing a physics homework and I don't know if my calculations are wrong but.. if you drop a 10kg object.. from 100 metres.. the impact will still be 10kg?

I used this to calculate velocity

then this to get joules

and then divided it by the gravitational constant and height

got 10 ;/

oh wait... the gravitational constant

[warm crest]

hey, idk if im supposed to send this here but im having trouble with some rigidbodies/colliders

so, basically that's the problem

the gun's collider phases through walls

i repeat, idk if im meant so send this here but it seemed the indicated place

if not correct me please

[desert wave]

have you fixed it?

[warm crest]

not yet

[agile anchor]

I have a similar problem

[shell adder]

there are a few ways to do this, i can think of two things

one is to have a mask on the background, making it so that any sprite outside the mask is invisible
this will still have the sprite being halfway through the wall, but it won't appear on the other side, it's simpler, but may not be what you want

another solution would be looking into a way to join the colliders of the player and gun together
you could do this with a composite collider, fixed distance joint, or code some sort of detection of when the gun enters a collider to stop the player's movement
https://docs.unity3d.com/Manual/class-CompositeCollider2D.html
https://docs.unity3d.com/Manual/Joints2D.html

i haven't done this before but those are some solutions i can think of

[stuck bay]

I can always tweak it later, but would you guys say this is reasonably close to realistic billiard physics?

[lapis plaza]

this was pushed to git: https://github.com/Unity-Technologies/VHACD/tree/package/com.unity.robotics.vhacd

(not yet on package manager)

[desert wave]

Give a bit of friction and bounciness tweaking

As of right now it looks very good

[stuck bay]

Well, I did adjust it and now I can't remember how I had it lol

But in that video, the balls weren't actually rotating.

I turned up the friction to 1 and now they do.

However, I can't get the deceleration to match correctly.

It either slows down too fast or too slow, the balls don't feel floaty enough.

[desert wave]

Did you give the table a material too?

[stuck bay]

Yes

And the cushions

[desert wave]

If you have the friction there and less on the balls?

[stuck bay]

I have it set to use the lowest friction

Wait hang on

Let me check

I mean highest friction, lowest bounce

Cloth has 1 Friction 0 Bounce

Cushion 1 Friction, 0.8 Bounce

Ball 0 Friction (Because it gets overridden to 1 anyway), 0.9 Bounce

Ball has 0 Linear Drag 1 Angular Drag

That's what I have at the moment

The biggest problem I have at the moment is that the balls either slow down far too quickly, or they get the floaty feel I want but they take forever to come to a dead stop.

I'll show what it looks like now

[desert wave]

Add a bit of linear drag, bounciness low on ground friction combine to test all of 3

[timid dove]

The collisions seem way too elastic to me

in the first video

[stuck bay]

Yeah I agree

[timid dove]

second one maybe too much friction with the felt

(or is that just drag)

[stuck bay]

It's drag 1 friction 1

It's just if I don't have enough friction the ball doesn't feel like it really turns enough

So it's tricky

But maybe I just don't understand how it all works

[desert wave]

I would say more linear drag

I imagine that in reality the table doesnt have much friction and is the air that slow down the balls

[stuck bay]

Well, I found a good site which talks about the physics of snooker

And it says the ball-cloth coefficient of sliding friction is about 0.2, while the spin of the ball decelerates at about 10 radians/second

I've just been struggling to translate that to PhysX

This feels a little better. Angular Drag 3 Friction 0.1.

OK I think 0.2 Friction as they said on the site feels better

AngDrag 2.5 Friction 0.2 feels good

Just need to adjust the bounce off cushions and balls I guess

[granite vapor]

Oh boy, you got me excited, hopefully soon the days of having to manually setup collision to save on performance will be gone.

[warm crest]

im gonna try the composite collider

didnt work

[lapis plaza]

VHACD is no magic pill, it's mainly a way of generating compound collider for mesh that would be suboptimal with just single convex collision

it also comes with it's own side issues when you have bunch of convex colliders packed right next to each others like that

but definitely useful for many things

[warm crest]

i think the problem is that instead of turning, the player sprite just instantly does a 180 degree turn, making the collider not to phase through the walls but to instantly appear at the other side

[desert wave]

you can use rigidbody.rotation

or moverotation

[steep oar]

Hey, I have 2 objects with rigidbodies and colliders that are connected via spring joint but when the character is moving (whilst connected), he can walk through walls and other objects. I have already turned on the 'Enable Collisions' options in the spring joint but nothing has changed. How do i stop this guy from running through walls?

[snow surge]

Not sure how to google this one so I'm looking for some help from y'all if you can afford it --
Fully physics driven (AddForce, AddTorque), but when these two fixed-joint affixed swords clash, they sometimes get stuck in eachother? Also happens on static geometry, but rarely.

[What I've already tried]

• upping solver iterations
• upping solver velocity iterations
• decreasing fixed timestep
• swapping joint on hand vs joint on sword

https://i.gyazo.com/030b6f83c866d6464650bf3da44fc790.mp4

[snow surge]

Did you set one to kinematic by accident? kinematic bodies aren't stopped by colliders. I believe "enable collisions" is specifically between the two connected rigidbodies

[steep oar]

nope, both non kinematic

and yeah i went to read the wiki page for it and saw that too :/

[steep oar]

^ I managed to fix it, I was making one of the objects as a kinematic in the script and it wasnt showing in the editor for some reason

welp removed those lines and its working now

[snow surge]

ahahaha classic, yeah I ran into that earlier today

👍

[flat palm]

This may be because I've been trying to wrap my head around quaternions all day but how does a Vector3 vary from just a 3 dimensional coordinate? is it connected to the origin? I ask because I have a Gizmo that is just drawing a ray from a Vector3 position to the same Vector3 position and for some reason it is drawing a line from the center of the object randomly into the air and this is confusing me

Gizmos.DrawRay(point_object.transform.position, point_object.transform.position);

that's literally the only thing code in the whole project it's inside a script that just draws that line