⚛️┃physics

[stuck bay]

instead of hard coding i need the graph for it

[supple sparrow]

Are you looking for AnimationCurve ?

[dim kiln]

Sorry for the late reply, but are there any tutorials on this?

[viral ginkgo]

I dont know

Your keyword is "active ragroll" though

[dim kiln]

ok thanks

[viral ginkgo]

active ragdoll means, you only use force/torque to control limbs,
if you have an animator directly affecting ragdoll limbs, or you have transform editing going on, you are doing things wrong
@dim kiln

[dim kiln]

no everything is turned off when I toggle my ragdoll on

ill try to use an active ragdoll and see how it goes

thanks again it means alot!

[viral ginkgo]

if you have a character thats animated
and it turns into ragdoll with no forces when it dies

thats not called an active ragdoll
@dim kiln

[dim kiln]

im not using an active ragdoll at the moment

i just have a model with animations and when I press U it turns into a ragdoll

[viral ginkgo]

then dont use "active ragdoll" as searching keyword

[dim kiln]

then what do i search up?

[viral ginkgo]

looks like you just wanna set all rigidbodies in children static or dynamic

GetComponentsInChildren<Rigidbody>() will get you all rigidbody children

It includes the rigidbody of itself if it has one though so be careful with that

@dim kiln

[dim kiln]

ill try it out thanks!

[pure mist]

Does anyone know if rigidbody connected joints consider the additional mass from connected bodies in calculating the physics?

[desert kestrel]

any ideas on how to make this... be less weird? i want to lock the Optic (blue thing) to the large sphere so that it moves around it

think mario galaxy, kind of?

[runic pagoda]

Try transform.RotateAround()?

You'll need to use the center of the sphere as your reference point

Though I imagine that will probably just be it's position vector

Assuming there's no offset

[desert kestrel]

maybe? hm. im a little worried about whether that will play nice with the cameracontroller script it's using.

[runic pagoda]

RotateAround() will automatically adjust orientation and position to achieve an "orbit" like motion

[desert kestrel]

i

i'll give it a shot!*

if im reading this right, i should swap out 'target.transform.position' with 'Core' ?

by which i mean. calling the core's position.

wouldnt RotateAround transform the optic, not constrain it? hold on im gonna make a diagram.

kinda like this?

https://orbsimulator.tumblr.com/post/636339539010600960/holyshit-holyshit-holyshit-that-works-really-well

ive got it almost working the optic just clips into the core which is weird

giving them rigidbodies was an attempt to fix that but that lead to the earlier gif

[runic pagoda]

hurm

the clipping is weird

it seems like there's a delay updating it's position relative to the sphere for some reason

because it doesn't stay clipped

[stuck bay]

Hi, anyone worked with the 'configurable joints'? I would like to create an active ragdoll, or better a spider made out of rigidbodies with configurable joints and so that it would stand up by itself, by applying torque force on the joints

though so far I haven't gotten anything that works well, the configurable joints don't transfer the rotation push/force into its parent member(s)

I looked in the asset store for a third party physics engine, but nothing that does joints better than Unity's PhysX

would love to hear if you know if there's some other physics engine out there that may do joint physics well

[lime galleon]

@desert kestrel Hey. Didnt read whole conversation, but cinemachine has pretty good free look camera implemented already. Look here https://youtu.be/X33t13gOBFw

I think its all u need in 5 minutes or less check ot out :)

[desert kestrel]

Maybe?? It's almost the opposite of what I need. Thanks for linking!

[stuck bay]

can anyone help? Unity mesh collider on big objects has holes

in narrow ways

https://i.imgur.com/WaTbjhk.png

https://i.imgur.com/nJ9jUWp.png

like if i walk there i will fall through mesh

[stuck bay]

the screens are dark so you may not see but the mesh connects nicely https://i.imgur.com/PmueIEc.png

[supple sparrow]

show the mesh collider instead/with teh mesh renderer

[stuck bay]

how

[supple sparrow]

in the scene wiew you should see a green wireframe when you select an object

so just to make sure there's no hole in the shape

[stuck bay]

https://i.imgur.com/IWQgRil.png

i dont see anything else

green wireframes - these do not show with mesh collider i think, only other colliders

[supple sparrow]

oh crap

Do you go fast ? collision mode is continuous ?

[foggy rapids]

the collider must be convex

what you're falling through may be a backface

[marble hull]

hey guys, how do i make a car controller? ive tried youtube and nothing works. any help?

[foggy rapids]

https://www.youtube.com/watch?v=TBIYSksI10k

[marble hull]

sorry im late lol. thanks

[shut wind]

Hi all, I have a hinge joint for an "arm" connected to a body but for some reason even if my target velocity is 0 the arm slowly falls down in the direction of gravity. I've tried a bunch of things but can't get it to stay in place

[inner cloud]

When i am unticking Physics.autoSimulate rigidbodies still simulate is it normal ?

Do you need a physics scene to be able to use Physics.Simulate() ?

[grizzled flax]

umm

my enemy floats

unles he falls on the ground from high distance

even if i put him on floor in the scene

he is floating like this at start of test

and i cant change its y coordinate while testing

oh

so

there is pathfinding hitbox for some reason

[supple sparrow]

No it can be a static, so just a collider

[dusk prairie]

Does boxcastall go through colliders or stop?

[viral ginkgo]

@dusk prairie xcasts it will go through trigger colliders only

with default options

[subtle bramble]

Hey all, how's everyone doing?
I'm working on a small bowling prototype as a personal project and I've been dealing with this issue where pins if hit in the right way will oscillate themselves into falling over, which is very unnatural. You can see it happening here: https://www.youtube.com/watch?v=2G0XjRiJAWI

I think it has to due with the shape of the mesh collider, it's not perfectly spherical on the bottom. I've tried moving the center of mass of the pins but that just makes their other behavior really weird looking.

I'm hesitant to touch the Drag coefficients too much because I don't want the pins to feel "stiff" in the air, even though this is the one thing I've noticed that helps them from exhibiting this behavior.

Any ideas? I am more than happy to provide more context if needed.

Also, I've tried using a capsule collider or even a combination of mesh and capsule colliders but that eliminates the ability for pins to wobble at all, which makes the game too easy, since pins will fall upon any slight perturbation.

[sharp estuary]

So I've got a bit of a logic issue. I'm trying to make it so my raycast will ignore my player, but not other people's
Because I'm making a first person shooter
And my raycast get's caught in my own body, but I can't disable raycasts completely since it'll stop my ability to shoot other players

[vast meadow]

im trying to make custom physics because the unity physics kinda smell, how do i do the drag?

i have this but obviously its bad, doesnt work, i didnt expect it to work i just needed something to start with

[supple sparrow]

How are your layers set up ?

Also you can just make the Ray start let's say 1 unit further on the forward axis

You're talking about other players, so there is netcode ? Maybe you could check if isLocalPlayer when you collide (name depends on what netcode implementation you're using) I didnt thought that one through but at a first glance I dont see a problem

[sharp estuary]

I figured out an ieda

Idea*

Gonna use RaycastAll

[tacit surge]

Hello! Maybe a dumb question because I am not an expert in math at all, but is there a way/formula to "predict" the position of a bullet at a given amount of time after being fired, taking into account the initial shot impulse, and different acceleration force (gravity, wind), all without using rigid body? It is something that is deterministic, but looking on different forum I can't seem to find a formula

[shrewd shoal]

quick question, does the layermask in the raycast make it only cast to that object or does it ignore anything with that layer

[supple sparrow]

As you wish, but I would still try with a simple Ray, because you're shooting in a straight line, and are only interested in the first hit in front of you.

[safe whale]

I'm trying to do a vision cone with a custom mesh and Raycast but when i call the code to set the origin to the enemy position in the update of the enemy it doesn't work. Does anyone know how i could try and fix it? If i move the origin by a vector with the x and/or y increasing by 1 it works.

[supple sparrow]

Try to start with the simple velocity formula v = d/t ?

[sharp estuary]

I had trouble with projectile mathematics in college

[supple sparrow]

So it seems you're looking for d = v * t

the position of a bullet [...] after being fired
-> in other words the distance traveled, so d
at a given amount of time
-> so the timestep t. Make it frame-rate independant with Time.deltaTime
taking into account the initial shot impulse
-> your initial velocity at the end of your gun barrel, so v

and different acceleration force (gravity, wind)
this comes after the first computation, yo ucan add as many "effectors" vectors on the first one to add more and more to your simulation.
Gravity would be a down vector (minus y axis) of 9.81 magnitude, wind could be a random vector you slightly update over time, ...

@tacit surge

Hope it gives you a starting point and ideas

[tacit surge]

Thank you! I am looking into the formula right now, and it looks like a great step forward for what I am trying to do!

[supple sparrow]

You could also find already-made parabola formulas online and tweak them

[supple sparrow]

Nice. That's a basic formula for moving objects. Like, your car runs an average of 100 miles per hour. How much distance will you have traveled in 2 hours ? This kind f problems.
Happy coding.

[tacit surge]

Thanks !

[supple sparrow]

The casted Ray will collide only with objects on that masks, ignoring (going through) others

[supple sparrow]

Plenty tutorials online for cone-based vision/detection
As your workaround hints, the enemy might collide with himself (mesh spawned inside the enemy). If spawning it a little amount forward works, why don't you keep working with that ?
Also you could cast on a "Player" layer if your enemies are only inerested in him, thus excluding themselves from the collision.

[onyx cypress]

~~Hey everyone :)
Having some difficulty with the physics engine. I have a game where I can create a vehicle out of pieces, and drive it around (think Robocraft).

I am however having difficulty with physics, more specifically the interactions between the vehicle and the terrain. It seems to generate force, or just kind of glide on some things that it really shouldn't be. All colliders are box colliders connected as a child to a single rigidbody. Center of mass is generated via script, and in this case is 1 back from the center.

How do I get the physics engine to behave and stop doing what is demonstrated in the below video?~~
Solved: The issue was caused by using Continuous Dynamic instead of Continuous Speculative. I switched to dynamic to make my friction a bit less intense, but I guess I will need to find another way around that.

[ruby frigate]

I have two objects with rigidbodies.
Object 1 and Object 2.
Object 2 rotates around one of it's axis.

If I then make object 1 a child of object 2,
shouldn't object 1 also rotate / have all the same
velocities etc. as it's parent?

[weary plank]

What's the difference between AddInputDependency and AddInputDependencyToComplete in BuildPhysicsWorld (DOTS Physics 0.52)?

[frigid pier]

@weary plank Don't cross-post, please.

[torpid jacinth]

how does unity, internally, actually calculate volume/mass for a complex model?

[dusk prairie]

When a boxcast hits something, is the raycashit.distance the distance from the center of the box or the distance from the point on the box's edge that on the line from the boxcenter to the hit.point?

[eager coral]

I have this car controller that uses a WheelFrictionCurve and I have no idea what it is and how can I edit the values

I want to change the stiffness of a wheel collider but it keeps changing back to 1

[velvet walrus]

Hello anyone can help me
I added rigdbody component to 3d model and the model on play, starts moving

to this direction without any input

if I replace the model with cube or sphere

everying is fine

can somebody guide me where should I look for this issue

[stuck bay]

@velvet walrus Have you tried printing your input to verify that it is zero. Other than that, my two experiences with this is (1) forgetting to work in local space and telling the object to move towards 0,0 instead of telling it to displace 0,0 and (2) having a controller connected and having it randomly do weird things

[burnt wedge]

anyone knows how to fix problem with joints eg. when grabbing object with hinge joint and moving it too far, it starts glitching and moving everywhere? (it happens either with VR controllers and with mouse in editor). It should rotate along an axis, but when moving (xr controller or mouse) away it glitches. Constraints don't work

[limpid quartz]

Does anyone have a lot of experience with speculative contacts here?

Looking at the documentation, it tells you that it creates a load of physics problems

But then doesn't go on to explain how to fix them or work around them

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

I've found that enabling speculative causes me to bounce of tiled surfaces

But also clip through ramps, even though its entire purpose is to prevent clipping at high speeds

Switching to dynamic stops me clipping through ramps and bouncing on tiled floors, but now I can get stuck in level geometry if I move too quickly

Also, I'm aware that "physics stuff" has to go into fixedupdate

Does that include calculations, detection, input, etc? Or just when I set rigidbody.velocity?

[supple sparrow]

The latter

[limpid quartz]

Right, so I'll just include a single line of code then 🙂

Any reason why I'd be clipping? I've tried every combination of physics setting on the rigidbody. Rigidbody.velocity is set in FixedUpdate

I've also tried different AddForce methods

and I still clip

[supple sparrow]

Could be a lot of different reasons

show something, someone will answer if it's relatively obvious

[cold socket]

Does Unity physics, when it comes to friction, account for different friction values depending on if the object is in movement or not?

resting and moving friction basically

[limpid quartz]

You can set dynamic and static friction

but I think a lot of people prefer to set both to 0 and write their own friction

depending on how precise you need movement to be, if it's a player being controlled, for example

It's not really a snippet, @supple sparrow

I have an extremely complicated movement system

and this has been a problem for a month now

I'd need to post pages and pages of code and provide a huge explanation of what I'm trying to achieve, so it'd be better as a dm

[supple sparrow]

Uhm, if it's a huge project, did you try recreating a small stripped example and see if it behaves the same ?

[limpid quartz]

Oh yeah

In ever conceivable combination you could imagine

I've been on work furlough for 3 weeks, so I've been working on it every day

With a mixture of people I know who are also programmers

and even a guy who studied physics at uni

What I can't get my head around

Is that if I'm setting this in FixedUpdate:

rigidBody.AddForce(masterVelocity - rigidBody.velocity, ForceMode.VelocityChange);

and literally not modifying the rigidbody anywhere else in the entire code solution

not manually changing its position

just adding force

How can it still clip? And if so, how do I get a better insight into the behind the scenes physics that unity is performing?

Does Unity not have a proper working implementation of speculative contacts?

[real drum]

How could i make an object "stick" to another moving object

I got this moving platform but once my player stands on it the platform keeps moving and then the player falls off

[supple sparrow]

@real drum I think you have some raycast collision so the player stays on top of the platform ? Meaning a constraint on the vertical axis ? You could do exactly the same to force your player position.x to be the same as the hit.collider

2d or 3d by the way ?

[supple sparrow]

This I don't know, I never use this mode

Even with continuous it sometimes misses collision on some frames

One workaround could be to raycast from previous position to current one just to make sure

Even cast a shape instead of a simple Ray

It's somehow hacky but could help for fast & small objects

Again the source of the problem could be elsewhere, we don't see anything of the context so cant really help my friend

[real drum]

I am not raycasting tho

2D

[supple sparrow]

so you let the engine handle ?

[real drum]

?

It can't

The Rigidbody2D is kinematic and it oscillates back and forth

[supple sparrow]

you let the engine put the player ontop of the platform, just by using colliders ?

[real drum]

yeah?

The player can move and jump around.

When it stands on the collider of the moving platform, the platform keeps moving but the player just kinda stays stationary

[supple sparrow]

you could constrain position when the player is "grounded"

[real drum]

Hmm

[supple sparrow]

same like preventing jumps when grounded

[real drum]

No i don't think i can do that

[real drum]

I already prevent that

[supple sparrow]

to forbid jump exploit. Same logic

[real drum]

if i freeze the position of my player on the x, then it won't move at all

[supple sparrow]

only when no input then ?

[real drum]

?

Even if i disable input or whatever it won't work

[supple sparrow]

not disabling input

[real drum]

then?

[supple sparrow]

Pseudo logic : player.transform.position.x === hit.collider.position.x when isGrounded and no player input

something close to this idea

[real drum]

okay

[supple sparrow]

Implementation depends a lot on how you already manage your player and world

and that's only for moving horizontally :p

[real drum]

that solves the problem for the time being

thanks

[supple sparrow]

cool

[real drum]

i guess for vertical platforms i could check if the y velocity of the platform is above / less than 0 and if it is then snaps it with the y

[supple sparrow]

Nope I would do the same as snapping on x

-> when isGrounded and no player input

I might miss something on the top of my head but that's where I'd start

actually just checking when no input

because we dont care if its a jump or just left or right

OR ! maybe increasing friction so it doesnt move easily on its own 🤷‍♂️

[arctic marsh]

@real drum I did this with adding the objects velocity to the players velocity, so if you dont move the player at all, it will jsut copy the objects velocity, if you run, it just adds up and so on.

[knotty dove]

How can I achieve a stable hover at a certain height? What I have causes a lot of bouncing

[arctic marsh]

@knotty dove Do you want it to be just at the offset or really hovering with physics?

[proud nova]

@knotty dove Might wanna look into PID controllers

[knotty dove]

Found a really comfortable way to do my hovering motions

[stuck bay]

Anyone now how to move with rigidbody without causing acceleration?

[stuck bay]

Want to ask advice about disabling mesh collider or setting its mesh to null, when far away from player.
What is better (basing on distance to player)?
1. doing nothing(leave them enabled and with mesh all the time) (why?)
2. disable/enable mesh collider
3. set component's mesh to null/to mesh
4 always remove and add mesh component, then set its mesh

i think 3 is best but not sure. cause AddComponent is heavier than just setting its mesh.
2. may be slowcus youre sitll keeping the mesh there. not sure
in fact ive seen FPS improvement after executing point 4, but could probably work with 3. too, not sure about 2.

I prefers disable/anable becuse setting mesh work only with one type of mesh

[obtuse portal]

Anyone know why there might be random invisible colliders? A few of my models have mesh colliders, but after importing them in the scene - in wide open fields (no colliders around other than terrain) im hitting random colliders. Selecting all objects in the scene I dont see anything that would cause it or any colliders around me.

[stuck bay]

you mean only one type of collider (meshcollider) ?

well yes

[supple sparrow]

Naive answer but.... by using a fixed velocity ?

[stuck bay]

I will try

[stuck bay]

And ,yes

[supple sparrow]

Do your computations and input and everything in Update(), but set the rb.velocity in FixedUpdate()

[stuck bay]

I have everything in fixed

[supple sparrow]

uhm, you prefer your calculations and input processing if any, at the Update rate.

but mess with physics related stuff on FixedUpdate

anyway that's another topic

[covert wadi]

Hello, i've used Rigidbody to my (long) blocks (not the blue one). But everytime, when i move the blocks, it becomes a weird design... (look at image) any solution?

thats the normal design:

This blocks r all in a Prefab

and every block in this prefab has a rigidbody

[ruby frigate]

I have to rigidbodies.
One of them (the player) can land on the other.
The other (ship) moves or rotates.

If I set the player's velocity and angularvelocity to the velocity of the ship, I was expecting the player to stand still on the ship while it moves.

But the player slowly slides, and weirdly rotates around, somewhat sticking to the ship, but not really

*two

(parenting the player to the ship is not an option in this case)

[ionic ivy]

Hey guys, I'm having a collider issue that I've narrowed down but can't solve. I created a capsule with a capsule collider and rigid body. As soon as I press play, the capsule collides with itself and moves out of the way. I can then move around freely and collide with other objects, but there's still another capsule collider at the original location. Using OnCollisionEnter and Debug.Log, it seems like the player object is colliding with itself. Every time I try to walk back towards the "spawn point" I get two collisions. I literally tested if(collision.gameObject == this.gameObject) and it's true twice. Any questions or ideas?

[supple sparrow]

@ruby frigate Did you try Raycasting towards the ground, and setting position of the player to the hit collider's position ?

Every frame while the player is supposed to be bound to the ship

Uhm but that could mess the rigidbody computations if other forces apply 🤔

Try with a target gameobject before you mess with raycasting and all that stuff

[supple sparrow]

Not sure I understand. Did you add a capsule collider although there was already a capsule collider ?

[ionic ivy]

@supple sparrow No, there's just the Player Object with a capsule collider. Other objects in the scene have box colliders, but those are acting as normal. When I watch in scene view, it looks like it's colliding with a totally invisible capsule collider (all gizmos on) that doesn't exist. And if I Debug.Log the positions of myself and the colliding object, they're both at the same position

And collision.gameObject == this.gameObject is true

[velvet tundra]

So I have a sphere + rigidbody that I move along my game. I also have a "player model" that also has a rigidbody attached that will lead to it being rotated to be diagonal on a slope.
Now I want the "player model" to be fixed to the sphere location with out blocking its movement while still "trying" to rotate

Is that possible?

[stuck bay]

https://i.imgur.com/91X11E0.gif

How to stop bouncing?

        ForceMode forceMode = default;
        if (animator.GetInteger("Floating") == 0)
        {
            forceMode = ForceMode.VelocityChange;
        }

        float speed = 2f;
        if (plrMovement.raycastHit.distance == 0)
        {
            forceMode = default;
            speed = 15f;
        }

        rigidbody.AddRelativeForce(-Vector3.up * speed, forceMode); // here 1 is best to climb mountains

generally velocityChange minimizes it a bit..

[stuck bay]

no good....

wont stop bouncing

[stuck bay]

rip my game

[viral ginkgo]

@stuck bay Whats this animator integer reading force, rigidbody and this speed paramater?

Are you making a hypercasual game with bouncing ball?

You don't need physics

just use something like transform.position.y = Matfh.abs(Mathf.sin(time)) * jumpLen

[stuck bay]

it means that if animator is jumping

then force is bigger

look the gif i linked..

not ball game lol

[viral ginkgo]

@stuck bay got root movement?

in animator i mean

[stuck bay]

the Checkbox ?

no

but i dont think its animator issue

it will also jump without animator component

unless you know how to imitate physics in 3d game?

[viral ginkgo]

just disable the animator, see if it can jump

@stuck bay if it can jump, then adjust the animations

i would also prefer not to read animator variables in character logic

character logic should be able function %100 well without knowing about the animator or the animated mesh

animator and logic referencing and affecting eachother will most likely turn around on you and bite you in the ass

[stuck bay]

you dont get me

im saying that character bounces from ground on its own without even doing anything

[stuck bay]

anyway i would like to try to do it without rigidbody.add force

i know i can use raycast for this

[arctic marsh]

your script smashes the character into the ground, doesnt it?

@stuck bay

[stuck bay]

i mean the physics far away from world origin break due to floating point origin error

so i choose to not do physics but imitate them. i asked the updated question in #archived-code-general

[loud moon]

With configurable joints. What is a way to get only the anchor or connector anchor to move towards the other? Trying to play with mass / mass scales and there's still a bit of pull on what I really want to be the "anchor". Can't use kinematic.

[ionic ivy]

trying again, any help would be appreciated. I'm having a collider issue that I've narrowed down but can't solve. My player is a capsule with a capsule collider and rigid body. As soon as I enter game mode, the capsule collides with itself and sort of teleports away from the spawn location. I can then move around freely and collide with other objects, but there's still an invisible capsule collider at the spawn location. Using OnCollisionEnter and Debug.Log, it seems like the player object is colliding with itself. Every time I try to walk back towards the "spawn point" I get two collisions. I literally tested if(collision.gameObject == this.gameObject) and it's true twice. There's absolutely nothing visible at the spawn location in scene view, all gizmos on. Any questions or ideas?

whoa ok I got frustrated and just started deleting stuff and figured it out. I'm using a player controller script and I had a character controller as well. Deleting the character controller fixed it. It seems like having 2 different controllers and only using one of them somehow creates 2 players, where one of them is invisible but still has an active collider?

I think I converted movement systems at one point and the character controller must have been left over. I'm using a rigid body now

[stuck bay]

So now i'm absolute frustrated about a just simple idea wich i already got nearly done, but failing in usability ... short: i have a door with hinge-joint rigidbody (to act like a door) and i want the player be able to "grab" the door to pull or push them ...

a system to get the "point you're looking at the door" i already got. But how i can "grab" the door at this point?

here's my current code try ...

https://pastebin.com/9pV6CUyK

and before ... I'm not a pro. But i already know some stuff. :/ And im not sure, a springjoint is useful for that ...

please help me o_o

[viral ginkgo]

@stuck bay You can edit the gravity acceleration that is by default -9.81 something
In project settings, in physics tab

[heavy nexus]

has anyone had an issue where DOTS PHysics do not show the gizmos in scene view? PHysicsShapeAuthoring is checked in gizmos but they do not render

n/m just restarted editor and it worked

[limpid quartz]

Has anyone got any experience with Unity's personalized learning courses? I've heard you can pay for one-on-one help with a particular subject

I'd like to go to them about some physics problems. Does anyone know what the pricing is like? I don't have much money spare, but I'd like to get 2-3 hours in with them

Can't see any pricing options though

[stuck bay]

ok, So I have a cube, that I want it to shoot out a raycast continously. I want to have some gameobject sphere's Follow that ray cast as it hits two layers of bigger encompassing spheres
RaycastHit[] hits;

hits = Physics.RaycastAll(new Vector3(transform.position.x ,transform.position.y ,transform.position.z + 20), transform.TransformDirection(Vector3.back),20.0F, layerMask);
if (hits.Length > 0)
{
SphereFBR.transform.position = hits[0].point;
SphereNBR.transform.position = hits[1].point;
}
I turn the cube and the raycast appears to head in the opposite direction and at exagerated values???
The script is attached to the cube

[obtuse portal]

Anyone know why there might be random invisible colliders in the scene? I dont actually see them, but walking around my character will get randomly stuck on an invisible wall or something of the sort.

[proud nova]

Physics debugger should be helpful here. Window -> Analysis -> Physics Debugger.

[obtuse portal]

Ah thank you, ill look into that

[vital ember]

Is there a way to manually do something like PlatformEffector2D? I want to conditionally ignore collisions. IgnoreCollision isn't really ideal as you need to call it before the collision is detected, which is not practical

[obtuse portal]

So I used the physics debugger in my scene today and it just made me more confused. When I am not in playmode there are none of the colliders except for the bottom terrain. However, when I click play it adds a ton of capsule colliders everywhere?

Ah I figured it out! I had added a bunch of trees earlier, but I would get the warning "The tree tree_model couldn't be instanced because the prefab contains no valid mesh renderer.". I guess what happened is it still added the colliders and not the renderer since it could not find one. Removing the trees from the terrain fixed this issue!

[heady thorn]

how do you rotate a wheel collider

[supple sparrow]

wheelCollider.motorTorque

and brakeTorque

and steeringsomething to turn

I dont remember exactly

check official manual

[jovial depot]

does anyone get a "good" behaviour using wheel colliders?

[stuck bay]

hey i want snow that piles up in a 2d platformer
already have particle system to show its snowing
but i want the ground to pile up with snow
which you can walk on and it destroys/compresses with like rigidbodies maybe?
any idea what i could use?
oh it should run decent on mobile too

[open bay]

Are Sphere colliders actually spheres or are they made up of polygons?

[vapid lava]

Does anyone know if anyone is actively working on the LockStep project that was available on Github anymore? I found the old official git, but the developer seems has given up on it some time ago now.

Or anything similar?

[jade stone]

When the character dies, i enable a ragdoll and disable a character controller. For the respawn, i do the opposite while also (after getting the issue demonstrated on the picture above) resetting the rotation of both the character himself as well as the rig (I have a function that just resets rotation of all children). Still when i respawn the character is sideways while his character controller is upright. Can any1 help me?

[supple sparrow]

None ? I'd say the engine does a distance check (using center and radius, obviously), the sphere is for humans to visualize. Dont know if that was your question.

Or maybe that's what you call "actually spheres"

[supple sparrow]

Maybe open an issue ticket there and ask ? You'll have better chances of getting an answer.

[viral ginkgo]

@open bay https://forum.unity.com/threads/capsule-vs-box-colliders.34254/

Says that spheres are more performant then box colliders
That probably answers your question

[supple sparrow]

Could you check in your prefab if all transforms are set to zero ? Maybe by setting them all to zero at respawn, you override a default rotation which was to 90° for example ?

[jade stone]

@supple sparrow hey, sorry i just saw your message, ill go check right now but i dont think the code i wrote even works

ah, i checked the root of the rig has a Z value of -90 but i checked in game and its still - 90 meaning that either my code doesnt work or it somehow gets set back to -90

also if i change the -90 to 0 it makes him lay flat on his back but as you can see in the picture above he is completely crooked when respawned

[stuck bay]

how the heck do I find the Y?

i mean i have planetary movement

and I raycast down

now i have position of ground, so i do

 transform.position = raycastHit.point;//

but truth is i want only to assign Y

not his forward (z) and left/right (X) coordinates

but Y depends on his rotation too

[jade stone]

@stuck bay maybe try using transform.position.y

Hey, i am trying to respawn a character after death and im having problems. When the character dies i enable a ragdoll and disable his character controller, for the respawn i want to reset him to his original pose before i enable the character controller & animator (and disable the ragdoll) otherwise he ends up crooked. Can someone help me with that?
Also i was originally just reloading the scene but since im trying to make this multiplayer, i cant have it so that every time someone respawns, the scene reloads

[languid forge]

This isn’t how trampolines are supposed to work irl, right?

[arctic marsh]

😄 I love it

you should make the RB static 😉

[vast idol]

So I have a strange issue, tried to sort it all day :)
My rb has jittering velocity on the y axis, video for reference.
I use a simple move and jump script, is all. rb on ground and player. (tilemapcollider with composite)
Any ideas is great!

(happens late in the clip)

[vast idol]

Think I sorted it...
The composite's offset could be the one that combined colliders and therefore it bugged out.

[foggy rapids]

you keep changing the gravity scale

[versed swift]

I'm having issues with capsule colliders in 2D, I'm trying to create the capsule collider so that the origin is right at the bottom of the character (where the red dot is), however every time I try to offset it, it keeps moving the collider capsule as well and not just the origin. I tried making a separate gameObject and doing it that way, but it still fails to work.

[foggy rapids]

make the sprite a child and offset it's local position

or vice-versa

oh wait, it's 2D you can just set the pivot point on the rect transform

[versed swift]

I tried the first part making the sprite a child

And how do I set the pivot point if you don't mind me asking (sorry im a beginner)

[foggy rapids]

i'd guess setting Pivot to x: 0.5 and y: 0 would get the desired result?

[stuck bay]

How can I stop rigid bodies from falling through the world, but still be on a surface?

I want them to have gravity

But

Not just fall thru any surfaces

y know?

And not have an anchor point aswell*

[stuck ore]

i have something really weird going on with rigidbody. whenever i get control of it it rotates and just starts to go insane.

like it moves around across the map

oh i fixed it. it was cause i had character controller enabled on something else lol

[dusk prairie]

Does rigidbody.movepositition update colliders in the same frame for kinematic rbs?
I'm moving a kinematic rigidbody through raycasts via it's transform(transform.position += moveAmountAfterCollisions) I'm doing this in fixedupdate. However, it can still skip through other colliders that are also kinematic rbs moving via raycasts. If I call physics2D.synctransforms this bug goes away. But obviously that's a bad solution.
AFAIK, transform changes move the colliders at the start of the fixedupdate but does not do so for changes inside fixedupdate. Does ridigbody.moveposition() sidestep this?

[thorn crypt]

I have box colliders on platforms and when I want to create platforms that are combined my character gets stuck on the transitions, I've made the gap between the box colliders as small as possible (zoomed in as much as i possibly can)

[cold socket]

@thorn crypt Right, yeah I know what you're talking about. You could try making a script for it

EdgeCompensation or something

[thorn crypt]

For me it stopped getting stuck when i changed to capsule colliders instead of box colliders (the player that runs ontop)

[cold socket]

uhm, is it 2D or 3D? @thorn crypt

[thorn crypt]

2d

[torpid prism]

where did the ecs physics package go in 2020.2+ ?

[snow orchid]

Anyone have an idea how I can improve the smoothness of rendering a moving ball? It works well on pc, but the ball gets jittery every now and then on mobile.

This is how I add movement to the ball:
_rigidbody2D.AddForce(directionNormalized * GameConstants.BALL_SPEED_MAXIMUM);

(Ballspeed Max is 1400f in this case)

[foggy rapids]

have you determined whether it's the ball or the camera that's jittering?

[rotund mica]

which unity callback you put in ? Update or FixedUpdate? how to trigger the addforce?

Also did you put the camera update in Lateupdate?

[snow orchid]

@rotund mica I've implemented IPointerUpHandler etc. and call _rigidBody2D.AddForce(myVector2D) inside that

my game is 2D and there is no camera movement

[rotund mica]

I think you should use Impulse or VelocityChange force mode.

Can you verify you use one of the two mentioned force mode?

[snow orchid]

I'm also accelerating the ball in FixedUpdate

Yes, I will put it to Impulse now

_rigidbody2D.velocity *= 1.00075f;

[rotund mica]

I don't get it. Why you put accelerating the ball in fixedupdate? it is not continuous force.

[snow orchid]

I changed the type to Force not Impulse

[rotund mica]

So you are intended to give the ball the continuous force?

[snow orchid]

I am not sure, I just heard all physics related things should be put in FixedUpdate. So I'm accelerating the ball there until a MAX is reached.

[rotund mica]

Yes but not always.

[snow orchid]

Behaviour I want: ball is shot from paddle, then accelerates over time until a max velocity is reached

I've also deactivated that part, it doesn't have any influence on the jittering it seems

[rotund mica]

just use impulse force in your IPointerUpHandler . Then try comment all your code in fixedupdate.

check if it is the effect you want.

[desert hearth]

I need a bit of help with some 2d raycast shenanigans, is this the channel to ask for help with that?

[rotund mica]

We use impulse force once=> like play pingpong. Use continuous force => coninue pushing a desk.

when use continous force, we should put it in fixedupdate.

[snow orchid]

doesn't help with the jittering unfortunately, still the same

the jittering isn't continuous btw. it happens occasionally

do I have to write my own move/update code? I would be surprised if it runs smoother than the unity's default, though.

[snow orchid]

@rotund mica I made a very simple test project, which has the same issue. Would you be able to look at it? Maybe you can find the issue?

[rotund mica]

@snow orchid Yes. You can send it to me.

[snow orchid]

@rotund mica https://gamedev.stackexchange.com/questions/187754/interpolation-on-rigidbody2d-not-working

it's linked in here 🙂

[rotund mica]

@snow orchid Got it. Upvoted. 🙂

[snow orchid]

@rotund mica Thanks! Let me know, if the project starts for you and you can see the problem.

[rotund mica]

@snow orchid Yes. Already start it. I may research on it later. Have not any clue on it yet.

[snow orchid]

Thank you 🙂

I hope you can find something

[shut timber]

//Currently the rb is moving upwards IEnumerator Move() { while(isMoving) { rb.transform.position = Vector3.Lerp(rb.transform.position, new Vector3(4166, rb.position.y, 0), 0.03f); Yield return new WaitForFixedUpdate(); } }

Guys, this is my code, how to fix the camera jittering ?

[stuck bay]

@shut timber Just use cinemachine.Free from assets store.There is numerus tutorials on yutube to how setup it.

Can someone help with this? https://answers.unity.com/questions/1797926/colliders-dont-work-no-matter-what.html

[rotund mica]

@snow orchid Sry. Cant solve it. But I am sure it is not a problem about regular update problem . I am afraid you have to tune the physics settings. Or you have to do it in kinematic way.

[snow orchid]

@rotund mica okay, thanks for your time! Do you know which physic settings I should take a deeper look at?

[rotund mica]

I am not sure. But I think it may be relevant to velocity and position iterations?

[snow orchid]

What I find weird is that the more physic steps I have, the more stuttering appears.

[rotund mica]

I have no idea how the internal physics works. Normally when more iterations(no more costly than fixupdate step otherwise it never catch up with rendering) happen during update(between rendering), the results should be more accurate.

[foggy rapids]

perhaps it's your world size

moving 1400 per tick will get it into the 10s of thousands pretty quick and that's around when floating point accuracy starts to deteriorate

or perhaps you're colliding with something that isn't obvious

it would help if you post the full code that moves ur ball

you might also try a different fixed timestep (0.033333, or 0.016666667)

[snow orchid]

@foggy rapids check this post: https://gamedev.stackexchange.com/questions/187754/interpolation-on-rigidbody2d-not-working there's more info on my case and a github with a sample project, which shows the problem

I thought about the size of things as well. That's currently my best lead, I think. I'll investigate this further in the following days. But, feel free to take a look at the sample scene and experiment yourself, if you like 👍

[foggy rapids]

reducing the timestep will expose the error better

[snow orchid]

I did do that and used 1/120 which made it stutter way more

[foggy rapids]

good, i'd use that to get better debug.logs from fixedupdate

[snow orchid]

doesn't a lower amount of timestep mean more executions of fixedupdate?

[foggy rapids]

yep, which means finer grain of detail

[snow orchid]

and then you would just put a debug log in the fixedupdate of the ball and check its position changes?

delta changes

[foggy rapids]

yeah, and by observing the change value over time you might get a clue about whats happening

[snow orchid]

say I do that and there are times whers it's smooth and delta is pretty constant and then I get spikes

where would you start to look then?

[foggy rapids]

i'd first look at velocity. if you get the jitter but the delta remains constant you can be sure it's not physics

if it DOES change, then put in Debug.Break(); when it breaks from the norm and your editor will pause and you can examine the inspector

i'll take a look at the project myself in a bit

[snow orchid]

👍 great input, thank you!

[foggy rapids]

dont forget to try a release build.

i just did and it's fine.
gotta love how a simple project like this somehow needs 2800 hidden shader variants

[foggy rapids]

🤷 i can't seem to fix it in editor. heck i cant even get vsync to work in editor

[stuck bay]

Can anyone help me with a basic physics problem?

[viral ginkgo]

just ask the question @stuck bay

[distant coyote]

I'll always answer a physics problem if its math related.

[gilded sparrow]

Hi all. Whats my options for low poly terrain? Do i have to use mesh collider for the whole world? Given that it's static, is it more expensive than terrain collider?
Should i still use terrain collider for the general shape, and ease to using some mesh colliders for the lowpoly landmarks, caves?

[lapis plaza]

@gilded sparrow is it more expensive? probably, considering terrain collider can make further approximations knowing it's limitations
is it notably more expensive? probably not but you should just measure the performance diff yourself if you really care about it

in general, you shouldn't merge whole "terrain" into single collision mesh, while you can get away with it on simple scenes it will basically limit the physics engine's broadphase for doing any optimizations

if you only think of physics performance, best would be if you could split that terrain even into multiple chunks (but then there are some corner cases at the terrain seams - which you could have with multiple terrain colliders too I suppose, I haven't checked how Unity handles these)

[empty bobcat]

how do we get movement somewhat like in Fall Guys?

Is there any good video about that kind of movement?

[fossil merlin]

There are some videos out there that recreated fall guys

maybe they talk about it

[nimble wadi]

Hi - was following along the Foundations:Explore Unity tutorial on unity main-site and the falling sphere's don't seem to be 'rolling' down the stairs on the monument. The spheres fall but stop when they hit the stairs. Per the tutorial I've got the Sphere Collider and the Rigidbody components (discrete/use gravity on rigid) but no luck - is there something the tutorial perhaps forgot to include?

[dapper nymph]

prototyping an FPS idea with Character Controller, and it's pretty nice for managing stepping up onto stairs and things like that - I've written up a script to push rigidbodies around, but I'm struggling with how to avoid marking things as "unsteppable" but still making them pushable - does anyone know if there's a LayerMask for objects effecting stepOffset?

[ocean atlas]

Hi, I was trying to make a active ragdoll but legs are kinda cursed do you guys have any ideas how to fix this ?

[rustic berry]

does anyone know why when something moves quick it ignores the colliders but when it's slow it acctully hits the collider

[weary dawn]

how do i apply a force in the direction the player is facing but at the same time so that it is aligned with the sloped floor?

[viral ginkgo]

Vector3.ProjectOnPlane will project a vector on a plane

You can raycast downwards to get surface normal, to use with that function, as it requires a plane normal

When the vector is projected, it will be smaller. You could normalize it to restore the length

@weary dawn

[weary dawn]

ill try that, thx alot 🙂

[viral ginkgo]

np

[signal olive]

Sorry for the DOTS question in here, but Is there a way to constrain rotation in Unity.Physics? seems that if I convert a game object to an entity it ignores Rigidbody constraint / Rotation Conostraint GO components

[empty bobcat]

no, there is only one fall guys tutorial as far as I have seen and they just use some paid asset for the movement, but I want to learn to do it without assets

[stuck bay]

are PHYSICS (and eg increased time step)

executed by CPU or GPU ?

id say cpu

but

i saw no cpu increase after increasing fixedTimeStep

[glacial jolt]

@stuck bay CPU

[stuck bay]

r u sure?

[viral ginkgo]

i think what you are doing is not changing simulation update rate @stuck bay

its just making things faster because physics time delta is increased

[stuck bay]

i changed fixed time step in settings to 0,01

[viral ginkgo]

then slower

[stuck bay]

default is 0.02

[viral ginkgo]

i'd think time would be slower

if you did that

but update rate wouldnt change

[stuck bay]

fixedupdate rate did

i have heaviest code in fixed update

[viral ginkgo]

i meant fixed update

interesting

[stuck bay]

why wouldnt it change?

0.01 step means it executes more often

[viral ginkgo]

default case:
by default you do 50 fixedupdates per second
and you use 0.02 for fixeddeltatime
so your simulation advances 50 * 0.02 seconds per reallife second

your case:
by default you do 50 fixedupdates per second
and you use 0.01 for fixeddeltatime
so your simulation advances 50 * 0.01 seconds per reallife second

.
thats what i think is going on

[stuck bay]

oh

well anyway the CPU usage should increase

my question was whether its the CPU or GPU executing

fixed update

[viral ginkgo]

cpu usage is proportinal to fixedupdates per second you do which is 50 in both cases

physics is on cpu so is your fixed update logic

you can see the orange parts in profiler to see how much cpu time it takes to execute physics stuff @stuck bay

[ocean atlas]

Hello, I was trying to make a 2d active ragdoll, but legs are standing like a crab when I give force to them

Do you guys now how to fix it ?

[stuck bay]

alrght, thanks man

[cold socket]

Is there a way to call a collision check?
Like a OnCollisionEnter, but whenever I want?
A Physics.OverlapBox just gives me colliders, not collision... anyone?

[nova rivet]

Hello guys, I have a problem - my objects start bouncing and moving on their own after colliding with other objects. Anyone knows what causes it? I use custom gravity and movement system instead of Unity's and that has nothing to do with its code, so I bet it's something thats built in.

the bouncing and movement starts after landing on the ground, after dropping on the other object's head

can't get it to stop either

I set all colliders to a physics material with 0 friction and bounciness

[nova rivet]

nevermind, managed to fix it

set rigidbody velocity to 0 if the character is touching the ground

[arctic marsh]

@nova rivet Just wondering why you say custom gravity and movement and still use dynamic rigidbodies here that actually work inside the unitys physics system

[nova rivet]

I use custom physics for movement and rigidbody for trigger collisions if that makes sense, I probably should get rid of it once I learn how to do everything without it

I read somewhere that you can only use trigger collisions if at least 1 object has a rb

the actual movement and hard collisions are calculated via colliders and code, no rigidbody in there

[arctic marsh]

Did you try rigidbody is kinematic and apply your own velocity for gravity? @nova rivet

[nova rivet]

I use my own gravity and add movement via transform.position

rigidbody is set to no gravity and not kinematic

[gilded sparrow]

@lapis plaza So.. still about what type of collider for terrain in a low poly world
Single collider for the whole world is not good bcoz the broadphase segment cant split it up for perf, so at least split the colliders

So my option is still 3:

1. Several terrain colliders, and some mesh/primitive colliders for props/caves
2. Several big static mesh colliders for the whole world, including caves
3. A crap load of primitive cols. Some mesh colliders here n there too i guess is ok?

[lapis plaza]

Just.. prototype and measure, test what happens on collider seams etc

[mellow verge]

why does my zombie flies to me even tho hes rigidbody gravity scale is at 10

and his mass is 10

here the config

[arctic marsh]

is there a script controlling him? @mellow verge

[mellow verge]

Yea

[arctic marsh]

good 😄

[grizzled flax]

if someone knows the sollution to this problem pls answer

https://forum.unity.com/threads/particle-system-collision-stops-working.1026544/

[arctic marsh]

I do not really understand your question there @grizzled flax

So your oncollision does destroys itself, right?

[grizzled flax]

well

it kills enemies for some time

and just stops

idk how

i found out if i just use it for some time it doesnt trigger the on collision

and doesnt reset if i turn it off and on

[arctic marsh]

you destroy the gameObject, your script is gone then with your whole gameobject. Is that intended?

[grizzled flax]

well yes but every single enemy has the script

the flamethrower working is only depends on how much i have used it, number of killed enemies doesnt change anything

btw collider on enemies doesnt dissapear because other weapons still kill them

[arctic marsh]

you are getting the logic wrong or I do. Your enemyAI Gameobject is being completely destroyed. So if this works, okay, lets continue. So you are saying your particlesystem stops sending collision events, or what is not getting collisions?

[grizzled flax]

it all works perfectly but event stops getting triggered after using flamethrower for sme time

all colliders are there, so i dont have a clue what could it be

i was thinking that maybe particles never actually fully dissapear so the game gets too ocupied, they just become invisible but they have limited lifetime so that doesnt make sense

[arctic marsh]

Okay lot of questions. How did you setup your particles, how do you spawn the enemy or are they already setup in scene?

[grizzled flax]

they are in the scene

and how do you want me to show you the particle system

thats all

[arctic marsh]

But if you are having them in the scene and all are destroyed, how can you check its not colliding?

[grizzled flax]

the script is on enemies

every single enemy has it

[arctic marsh]

and every single enemy gets destroyed when hit by a collision

[grizzled flax]

should*

bc as i said it stops working

[arctic marsh]

What about the max collision shapes?

[grizzled flax]

where is that

[arctic marsh]

in your screenshot on the collision particle

[grizzled flax]

hmmm

but

idk it doesnt make sense since they stop working even if i didnt kill any enemies

[arctic marsh]

But your particles are firing none stop?

[grizzled flax]

no

and the max collision shapes doesnt change anything

nothing about this problem makes sense

[arctic marsh]

So your enemies are prefabs that are built all the same way?

[grizzled flax]

yes

[grizzled flax]

and i just tried deleting and instantiating the particle system and it doesnt reset it

[grizzled flax]

so i was testing a bit

and

i can still destroy other objects

and i made a separate script for onparticlecollision and the problem has nothing to do with that enemyAI script

well well well

the navMeshAgent fucks it up

[grizzled flax]

I was planning on changing the pathfinding anyways so it doesn't matter

@arctic marsh thanks for trying to help

[fallen temple]

hello

[leaden ether]

Im not sure if its physics or not so I will just ask it here, I want to be able to smack enemies on each other and like cancel theri rotation freeze on the z, I already did it but my problem is that when I hit them by moving my mouse it just pass through them and not knocking them away unless I do it slowly Im just rotation the main body so if anyone know a better way of doing it please tell me. Here is a video that show how it is

[lone tinsel]

I've been working on a physics based destructible building but no matter what I do it will either destroy itself or not destroy at all can some one please help me? I only parts of it to destroy at a time. it's really been given me a pain in the neck. what I have now isn't very great.

[dim kiln]

Hey guys I made a car in unity and the motorforce used to be 5000 and the speed was just right but now even if i put it at 1 the speed is insane

[stoic ivy]

hey i have a issue with armatures and capsule colliders, when i add capsule colliders and set them up the bone gets placed on the center of the capsule collider and messes up everything

[formal egret]

@dim kiln are you multiplying the speed with time function also check the force mode and the gravity in the rigidbody components

[dim kiln]

something was messed up with the project

i just made a new one imported all the stuff and its good now

[formal egret]

@lone tinsel you can use a coroutine to delay the destruction and give each part a tag and playe with the layer matrix in the project settings

[ocean atlas]

Hello, I made a 2d active walking ragdoll, do you guys have any feedbacks ?

[umbral leaf]

Stick guy is very thin😂 @ocean atlas

[stuck bay]

What can be the reasons that a car physics are not 100% the same with VSync On (60fps) and Off ?

The difference is minimal but for me that i played a lot is clear. Is possible that some "Time.deltaTime *" is missing in some formula?

[somber crow]

This is nice
The arms are flying everywhere though

[supple mason]

is this the best channel to ask about colliders?

[viral ginkgo]

@stuck bay physics should be handled in FixedUpdate and deltaTime should not be used

can use fixedDeltaTime, but i prefer not to

i dont use any time delta with physics

fixed update will run 50fps %99 of the time

if you use fixedDeltaTime, you risk applying too much force/movement etc per frame when you simulation lags

which can cause glitches

[stuck bay]

@viral ginkgo thanks! .

[supple mason]

if i have an object, says its a cube, and its facing a direction, and now another object collides with it, how can i tell if the collision happened from the same direction the cube is facing?

relative to the cube, not the world

specifically, in this case the cube is a checkpoint in a race track, however the 'track' can go back on itself, so you can pass the same checkpoint going the other way, imagine it like a rally stage with a u-turn at the end so you come back down

i only want the trigger to work when the car hits a checkpoint from one side

[supple mason]

okay looks like i got something working

i raycast from the other object to the car, and is the relative Z is plus or minus determines if the collision is happening from the front or back

big problem now if i've noticed my trigger is happening twice for the same objects

[foggy rapids]

I think it would make sense to make sure the triggers transforms are facing the correct direction.
Then you could use the dot product of velocity and the trigger's forward vector to figure out if the body is moving in that direction

[frosty shoal]

Hey guys, I'm trying to implement my own 2d character physics system. I've landed on Velocity Verlet integration. I have this up and running and everything seems to be working well - velocity, acceleration, updating position, non linear acceleration by way of drag laterally and vertically.

All is well.

But actually using the system is somewhat escaping me.

    void AddImpulse(Vector2 impulse)
    {
        vel += impulse;
    }```
I have written this helper function for modifying the velocity directly (e.g. Jump) on a single frame.
But I'm not entirely sure if that's how I should be using it? Also - how should set constant horizontal velocity?
Is it OK practice to directly modify the velocity or should all changes to the system be applied as acceleration?

[lone tinsel]

so I made a destructible building using fixed joints but its really lagging is there any way to fix this?

[frosty shoal]

other than doing some fancy compute shader to do your simulation on, I think you're approaching a bottleneck of the physics system @lone tinsel

[lone tinsel]

oh ok.

[frosty shoal]

though that does look surprisingly laggy for the amount of pieces there

[lone tinsel]

there's close to 2000 pieces in the building

I tried making a build of my project and running it outside of the editor and its much faster. Thanks for the help though.

[frosty shoal]

ahh interesting

[charred owl]

how do i make a ragdoll balance itself?
i used the ragdoll wizard

[lone tinsel]

@charred owl here this tutorial series helped me alot https://www.youtube.com/watch?v=I1beTn_913c&list=PL9gnJgSxuivEf8D6upAd5aNj6H4OFWt4m

[charred owl]

yea im following it but i used the ragdoll wizard and that one has character joints, not configurable joints

should i convert all the joints?

[lone tinsel]

That's up to you. I just made a character in blender made out of different parts and followed the tutorial.

[charred owl]

i see

yea ill probably convert them

[charred owl]

this bone moves away even tho its motion is locked

anybody know why that may be?

[tepid panther]

hey all i was wondering if someone with experience with unity physics could help me figure out what's wrong with this jumping function being called every frame in Update()

public void JumpHandler() {
    RaycastHit hitGround;
    onGround = Physics.Raycast(transform.position, -transform.up, out hitGround, 1.25f);

    if (onGround && Input.GetButtonDown("Jump")) {
        rigidBody.AddForce(Vector3.up * jumpHeight, ForceMode.Impulse);
    }
}

as opposed to smooth realistic jumping, the player jerks immediately upwards and then slowly drifts downward

[frigid pier]

@tepid panther Nothing to do with this code. You probably have a weak gravity or drag is too strong. Increase/decrease either.

[tepid panther]

i tried increasing and decreasing both and i even tried fully disabling both

[frigid pier]

Then your controls ignore physics and use their own calculations, which is bad mixing those.

[tepid panther]

which is why im not doing that, i just tried it

im currently working with this

but no matter what values i try for drag and gravity it teleports up instantly and then floats down way too slowly

it looks like evrything should work fine but it just doesnt

[frigid pier]

If you are using default player controller it doesn't use physics

Ah, default one called Character Controller. Post your controller code in hatebin.com

[tepid panther]

the part thats broken is this

everything else works perfectly

its just those 4 lines

[frigid pier]

It's just a ground detection. Debug your code where you apply any additional force.

(If ground detection was broken you would be able to do multiple jumps in the air)

[tepid panther]

the first half is yes

the bottom is the only place vertical force is being applied

and the only thing thats at all broken

everything else works exactly as expected

[fading flare]

Hi guys, wanna ask when is Unity changed the Physics update from 30fps to 50fps?

[formal egret]

@stuck bay use a raycast to get the normal of slop then use

Quaternion.FromToRotation(transform.up, hit.normal) ;

[tepid panther]

i cant figure out why this is almost instantly jerking the player up instead of providing a realistic jump

rigidBody.AddForce(Vector2.up * jumpHeight, ForceMode.Impulse);

[foggy rapids]

because you used ForceMode.Impulse, which is probably the best you're going to get.
If you want realistic, apply ForceMode.Force every frame modifying the value in such a way that it matches the forces and timing implied by whatever animation is being used

[tepid panther]

this is being applied every frame

this is in Update()
and I tried using force as well

[foggy rapids]

impulse force is meant to be applied once

[tepid panther]

ive tried using each of the force methods it made no difference at all other than force requiring much higher jumpHeight

but they all move instantly and then float down

ive also tried tweaking gravity and drag

and even disabling them both entirely

none of which made any difference

and that one line is the only place any vertical force is being applied at all

[glacial jolt]

@tepid panther might be easier to debug the issue if you post a clip of what's happening (can use OBS and gfycat)

[tepid panther]

it jerks straight upwards instantly and then falls from there instead of a smooth upwards force and then a smooth downwards one

[hallow cedar]

have you tried just doing addforce

with no forcemode

rigidBody.AddForce(Vector3.up * jumpHeight);

[tepid panther]

it always has a forcemode

it defaults to force

[hallow cedar]

just try that one then

[tepid panther]

rigidBody.AddForce(Vector3.up * jumpHeight); is the same as rigidBody.AddForce(Vector3.up * jumpHeight, Forcemode.Force);

which i tried 😔

[hallow cedar]

this is a real awful solution but try setting the velocity directly

rb.velocity = new Vector3(rb.velocity.x, jumpHeight, rb.velocity.z);

[tepid panther]

bizarre that does absolutely nothing

[glacial jolt]

can you post your entire script?

you can also add a Debug.Break() line inside the jump if statement if you want to see why your character is getting pushed so high

[tepid panther]

everything else is working fine the only issue is with that single line thats being called every frame in Update()

no other vertical force is being anywhere else

and thats all thats messed up

[glacial jolt]

hopefully! But bugs are by definition unexpected

what is jumpHeight set to?

[tepid panther]

ive tried many different values

[glacial jolt]

you can replace the add force with
rigidBody.velocity += Vector3.up * jumpHeight;

[tepid panther]

i tried that after jeff suggested it and

[glacial jolt]

yeah, post your entire script, and a pic of your player's hierarchy

[tepid panther]

heres player settings and such

the full script doesnt matter bc theres nothing else messing with vertical force

[glacial jolt]

hah. I bet $2 it's nothing in that one line

what does gravity modifier do?

[burnt berry]

Hey guys!
I'm really stuck here - This script should work as a groundcheck via boxcast for the player, but I can still jump mid-air for most of the time. But sometimes it changes the canJump to false, as intended. I can't find any specific reason why or when it works, but it mostly doesn't.
First part is in FixedUpdate
checkDist is 0.01
tag is applied (even if it wasn't shouldn't be able to jump at all)
already tried messing around with the layermask thing, but it even worked less (didn't work as intended and even stopped giving me the Debug.Log messages)
Any help appreciated ❤️ (Guess it's something small a beginner like me doesn't notice/know?)
Thanks!

[glacial jolt]

you can add Debug.DrawLine(transform.position, hitInfo.point) if you want to see where the box cast is hitting

also, Physics.BoxCast returns a bool, so you can wrap it in an if statement instead of checking if the collider is not null (it is effectively the same thing, but a bit cleaner)

[fickle ginkgo]

How do I make my cube be able to push other cubes?
Right now, they dont get effected by a cube moving at mach 10 speed

[random arch]

Other cubes must have box collider and rigid body components

[fickle ginkgo]

they do

[burnt berry]

@fickle ginkgo Maybe you accitently set them to kinematic? Afaik that means they can't be moved by physics.

[fickle ginkgo]

nope they arenr kinematic

[burnt berry]

I did both things you mentioned, and now have further information:
It seems like the boxcast is drawn from 0, 0, 0 (in the scene) to my player, at least the Debug.DrawLine gets drawn this way ... Now I'm even more confused 😅
I already tried to use "public GameObject player" (and then assigning the right gameobject) and then "player.transform" in the Boxcast - nothing changed.

[burnt berry]

Ah, now I get it! Since the hitInfo is null, it obviously draws the line from the player to 0,0,0 - but I still don't get why the boxcast is hitting nothing / randomly working or not ...
For most of the time a "Debug.Log(hitInfo.collider)" returns null, even when my player is physically on the ground, and also I can still jump mid-air, even though canJump should be changed to false by the else statement ...
I'm seriously confused ...
edit:
further played around with the values. I raised the checkDist (maximum Distance of the boxcast), and as long the ground is in this Distance, it returns true and with the collider.tag ground, but as soon as the player is on the ground it starts to return null again. (But I can still jump (?))

[proper coral]

If I add a hinge joint between an axle and wheel mesh (with their own mesh colliders and rigid bodies), can that replace a wheel collider?

[burnt berry]

Sooo, I fixed the mid-air-jump problem - It was the case that I just was stupid, and forgot an else case for when hitInfo = null to set canJump = false.
Now there is one problem left:
The boxcast returns null when "sitting on" the collider - i.e. if I'm falling toward the ground, the boxcast returns true as soon as I am "in reach", but starts returning null when im touching the ground, so that I cannot jump at all ...

[burnt berry]

Finally got it to work!
Found the solution here:
https://forum.unity.com/threads/solved-problems-with-pyhsics-boxcast.378583/
No idea why it works this way, but it does.

[pliant dragon]

@tepid panther i had the exact same problem a few days ago. i don't know why, but it started working when i lowered the drag on my player rigidbody.

[glacial jolt]

@burnt berry didn't read the thread in super detail, but BoxCast/SphereCast/CapsuleCast will not detect any objects that are intersecting their shape where the cast begins

so if the Box is overlapping another collider at the start of its cast, that collider will not be hit

[flint sail]

I'm trying to do a basic floor detection but I'm getting a strange issue where the OverlapCollider seems to detect overlap before it should. (added gif with visual)
Code to do detection:

```void FixedUpdate()
{
    //Reset value
    isLanded = false;

    //Do cast to see if any collisions are present
    Collider2D[] hit2D = new Collider2D[8];
    int floors = collider.OverlapCollider(contactFilter, hit2D);

    if (floors > 0)
        isLanded = true;
}```

What am I doing wrong?

[glacial jolt]

recommend debugging out the names of the objects it is hitting, might be overlapping something you missed

[flint sail]

Just checked, it is indeed overlapping with the floor.

But it seems to consider it overlapping far before it does.

[glacial jolt]

@flint sail not sure if this affects the Overlap queries, but in Physics2D there is the Default Contact Offset setting. This looks way too large a distance for this to be affecting it, tho

[tepid panther]

idk what's wrong I tried lowering and decreasing that, angular drag, and gravity and it didn't help 😔

[flint sail]

the "Default Contact Offset setting" sounds like something that may be my issue though, where is this set?

[frigid pier]

In Project Settings > Physics2D

[flint sail]

That's exactly what it was. Thanks guys!

[stuck bay]

trying to find if model is colliding during EditMode

but failing hard

.overlap doesnt work

idk maybe rigidbody sleeps during

edit mode

or colliders..

[frosty fog]

Hey guys, I'm a bit of a newb when it comes to programming and physics. I'm trying to find a best way to handle stuff like pushing plenty of simple rigidbodies with another rigid body. I'm moving one rigidbody using transform in fixedupdate and the other rigidbodies are just glitching through the other body. I tried different collision detection methods and ended up with Continuous Speculative (not sure if that's the best chocie considering my objects aint moving at very fast speeds). Things worked better when I used AddForce instead of Transform, but I didn't like how floaty the movement was :/. Anyone have any tips?

This is how the scene looks. Im trying to move the red and green boxes with the gray 'vehicle

in action. The green boxes just goes though my vehicle

[glacial jolt]

@frosty fog moving by transform essentially teleports the rigidbody from the physics engine's point of view, so collisions are not correctly resovled.

An easy solution would be to directly set the Rigidbody.velocity of the pushing one so that you can control it precisely

[frosty fog]

@glacial jolt Thanks, I'll test it out 🙂

[mighty void]

Hey,
me and a friend are working on a little project to learn how to code in unity.
We are trying to make a bhop strafing movement, but the thing is, we dont want the player to accelerate to unlimited speed. But we dont know how to limit that.
If s1 want to help us, i can give full movement code.
you can DM or tag.
thx

PS: the code we got is not ours. We just took the code and started learning from it.
It has that unlimited acceleration in it

[stuck bay]

  Collider[] colliders = Physics.OverlapBox(model.position, meshBounds.extents * 50f, model.rotation, 1 << 0, QueryTriggerInteraction.Collide);

this works very weird

like extents * 50f to barely detect collision

despite models size being around 1f(vector3.one)

[frosty fog]

@mighty void

  if(rigidbody.velocity.sqrMagnitude > maxVelocity)
             {
                 //smoothness of the slowdown is controlled by the 0.99f, 
                 //0.5f is less smooth, 0.9999f is more smooth
                     rigidbody.velocity *= 0.99f;
             }

Taken from : https://answers.unity.com/questions/9985/limiting-rigidbody-velocity.html

[stuck bay]

how come simple raycast works in edit mode

but

simple overlap or bounds.intersect or sweeptest doesnt

[tender gulch]

You sure it doesn't?

[south cedar]

how do i make bouncy materials ignore certain objects?

[stuck bay]

is

sphere cast

slower

than boxcast

[stuck bay]

hello everyone

want your opinion

i made a script for auto spawning objects inside a maze

the problem is that they spawning inside the walls

even though i have a collision check

so the thing is

my walls have box colliders(not triggered).

the crates i'm trying to spawn have box colliders and rigidbody with locked position and rotation

but locking the position of the crates interfers with the collision check

so i thought maybe i can do the position lock after some time.e.g the object is spawning,checking the collision and locking the position.

what you suggest?

i need the crates to be locked as i want to destroy them with the player,if they are not locked the player moves them.

[uneven shore]

I'm making a 2d map and using tile map collider.
I also have an enemy with collision enabled, that walks until it hits a wall, and the collision it self works fine.
However I've attached a script and added OnCollisionEnter2D event, but it seems to only be called once when the enemy is on the floor, and not called
when the enemy hits the wall. How can I solve this?

@stuck bay You could also put a really big weight on them so the player can't move them.
but delaying the position lock after the check seems simple enough. If it works, go for it

[unreal quail]

Is there some issue with OnMouse[Enter/Exit/Over] events?
~~I have an object, with a 2D collider set to trigger and a script with those events and the events aren't being triggered. ~~
There is nothing in front of the collider, it is the only object in the scene.
Physics.queriesHitTriggers is true.

I'm using the new input system if that causes issues?

Looks like it was the new input system. The documentation for that whole system leaves a lot to be desired.

[coral mango]

That puts it mildly.

[flint sail]

I've been trying to make a simple grounded/sliding detection system where if the player is landed, it acts one way but if it's touching the ground on an angle, it acts another way. I thought I was being clever by having detectors on each side to detect if he's grounded or if he's sliding but the 2D collider is not super reliable and half the time, it sticks into other colliders, triggering detectors that shouldn't be triggered. What's a more consistent way for me to be doing this? 🤔

[formal egret]

@flint sail using a ray cast that points downwards to check if the object is on a flat ground or slop

[viral ginkgo]

@flint sail you got rigidbody interpolation on?

if so, try closing it to see if it fixes

[flint sail]

OOoh, good call. Thanks for the idea

[flint sail]

That will be my backup plan. THanks

[gloomy raven]

How can I prevent the sprite from "bouncing" if there's a collision? My ideal behavior is the sprite doesn't move if the next tile is "no-go". Currently situation on the video

[foggy rapids]

... check whether the tile you're moving onto is "no-go" before moving.

[gloomy raven]

you mean via script or smth?

[foggy rapids]

yea

i'm assuming there's a script controlling the character

[gloomy raven]

yup

Which way to check if next tile is wall/stone/etc. will be enough? Raycasting? Something else?

[flint sail]

That does not help in the end. 😦 Already set to none.

[tough cloak]

I'm trying to make a platformer, but my player keeps getting stuck on the ground

None of the online solutions have fixed it for me

[urban geyser]

Can anybody help me with this please

[tough cloak]

what on Earth happened there 😂

I think you'll have to manually fix that or separate your level into multiple objects

[urban geyser]

Do you know how big is the maze?

[tough cloak]

no

[tough cloak]

oh

well I don't know of any automatic fixes so uh, you might have to just redo the level in multiple objects

[foggy rapids]

you'll need a box collider for each line segment or you'll need to manually create the polygon collider from line segment info in the graphic

[urban geyser]

oof

[tough cloak]

Yeah that's sort of what I just said

[urban geyser]

Why can't it be simple

[tough cloak]

I don't know

[urban geyser]

Can't the spirit just collide with the other one? Its just a texture with alpha and black

[foggy rapids]

it's usually wiser to work the other way before committing to huge assets like that

[urban geyser]

Maybe it will work with a SVG

[foggy rapids]

shadowblade has the same problem

[tough cloak]

Have you created your player yet @urban geyser ?

[foggy rapids]

his colliders are all boxes

[urban geyser]

Well I can't even use it

[tough cloak]

Well, I have a similar problem

My player is getting stuck

[urban geyser]

No, but it won't work

[tough cloak]

oh

nevermind then

[foggy rapids]

shadowblade's solution will involve manually creating each collider, or writing code to detect and handle the case where one slides along boxes

[tough cloak]

oh boy

[urban geyser]

I have a 3D model of the maze, maybe it will work with a 3D collider?

[tough cloak]

maybe

[foggy rapids]

yes, that will work

[tough cloak]

Well, here's my biggest problem.

[urban geyser]

I hope there are not too many faces this is suposed to run on mobile

[tough cloak]

My levels are generated from an image sooooooo

I tried a composite collider 2D to combine them so it doesn't get stuck on the edges but that didn't work either

[foggy rapids]

you can switch to circle collider for the ground-conntacting part of your player

[tough cloak]

I could

[foggy rapids]

these problems are hard to solve and the solution is usually a little strange like that

[tough cloak]

You mean like have the box collider squished and move it up, then have a circle collider beneath it?

[foggy rapids]

yeah. this way you dont have any corners hitting corners because ultimately that's the cause of the issue

[tough cloak]

Ok

I'll try it

thanks for the suggestion

[urban geyser]

Got it

[foggy rapids]

nice.

[tough cloak]

Good

That looks nice

Ight, so I have the circle collider but my player bounces

I gtg, if you have an answer DM me please.

[foggy rapids]

only thing left i can think of is modify your character controller to keep them above the ground slightly and actually avoid those collisions 👍 gl

[tough cloak]

Thank you

[kind obsidian]

Debug Log:

Knockback force (972831.0, -231516.2, 0.0)

Why doesn't my object move at all?

        Vector3 force = direction.normalized * knockbackStrength;
        Debug.Log($"Knockback force {force}");
        rb.AddForce(force, ForceMode2D.Impulse);

[foggy rapids]

probably automass

or something modified velocity directly, after this, so that it seems like it never happened

[kind obsidian]

thanks ill check

ah fudge, yes probably that in a parent class

private void UpdateInputMovement() {
        if (Direction.magnitude > 0) {
            FacingDirection = Direction;
        }
        rb.velocity = Direction * speed;

wanted knockback for my character if he gets shot

hmm

but i need to use rb.velocity for input movement

[foggy rapids]

it's fine, just apply the knockback force after movement

or even better calculate the right force to use so that your input uses AddForce as well

[kind obsidian]

Oh true, thanks for the ideas

thanks m8, I'll go with the knockback force after movement solution. I'll need to get better at how AddForce works before converting it

[kind obsidian]

actually ill go for the Force method straight away since that seems most recommended

I'll have to make it work better, the con is with Force, the movement might not be as easy to remember with muscle memory than resetting the velocity, but maybe the workaround is to have an extremely high linear drag

[stuck bay]

Once i added trees etc fps went down. Changed physics timestep to 0.02 from faster. Before it didn't do anything And now it increased fps

But i do physics only in fixedupdate

So i think its models colliders that lag

[kind obsidian]

 protected virtual void OnTriggerEnter2D(Collider2D collision) {
        HandleCollision(collision);
    }

    void OnCollisionEnter2D(Collider2D collision) {
        HandleCollision(collision);
    }

    private void HandleCollision(Collider2D collision) {

Is this the right approach to handle collisions between two colliders (no triggers between Player, or Enemy, they both just have an ordinary collider with rigidbodies)

Because it doesn't work when two colliders (non-triggers) collide against each other, there's no collision detected :L

Is the only workaround creating two colliders, one trigger, and a non-trigger?

NVM i'm an idiot lads

Had the wrong function signature private void OnCollisionEnter2D(Collision2D collision) {

[covert comet]

So, I'd love if someone could help me.

http://puu.sh/H3izo/a2c47893a3.jpg Just a humble Pong recreation, working on the AI. But I have a problem.

I want the ball to have zero friction when it hits the ceiling/floor, but slight vertical friction when it hits the paddles, so as to allow for a little bit of manipulation of the ball's trajectory.

My workaround was changing the ball's Rigidbody material just before it hits the ceiling/floor to something different -- is it too hacky to check collisions on FixedUpdate, and can I even do that at all?

[glacial jolt]

@covert comet you can check to see if either the top/bottom wall or the left/right are in the path of the ball using https://docs.unity3d.com/ScriptReference/Physics.BoxCast.html

you can do this right after the ball is hit, since its trajectory will no longer change at that point

[empty axle]

Hello. I would like to know if my Unity should be lagging with only 1000 circle colliders and 300 rigidbodies

If I remove the 300 rigid bodies it becomes faster again but I loose the ability to have collisions with the entities
I don't have any use for gravity so I disabled it 😀
How many rigidbodies can unity handle ? Am I doing something wrong ?
I'm only creating instances of enemies.

[worn zodiac]

hey, does anyone know why/how the animator can override the physics of a game object ? It seems that when my player has an animator, some physical movement are not hapenning (in my case, horizontal movement with rigidBody.AddForce(...)). but when I remove the animator (or attach it to a child object of my player, and not the player directly, it's working alright !

[foggy rapids]

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

[worn zodiac]

but weirdly enough, when "Apply Root Motion" box was ticked, I could move vertically, but still not horizontally... :/

[foggy rapids]

it's all too complicated for me, but ultimately one must have authority over the other. it's probably best to set this in stone early

[empty axle]

Hello. This is a following to my yesterday question.
This is a youtube video showcasing 5000+ rigid bodies ships. How to achieve this ? Is there a way to adjust settings in unity for better performance?
https://www.youtube.com/watch?v=Xe5tQjbpKU4
The most I'm able to achieve is 1000 enemies and the fps drop to 35
As shown in the screenshot

[proven lance]

Probably #archived-dots

[stuck bay]

is there anything wrong with this raycasting code?

i want to ground the model completely by making sure every side is in ground https://hatebin.com/nukvjyzevb

what this code does is that sometimes the model is completely about 20% in the ground when it doesnt need to

and sometimes its a bit above ground

[tidal linden]

I'm trying to make a rigidbody stick to a platform that changes velocity pretty quickly without the passanger rigidbody flying away or leaving the ground. should I use rigidbody.moveposition for this?

syncing the passanger's valocity to the platform's velocity seems to still have the problem

[tidal linden]

kinda helped by putting an OverlapBox on the platform, and using MovePosition if the passenger disconnected that frame

but not perfect

[glacial jolt]

setting the velocity in theory would work—but if you're doing this, the object might not have gravity applied (since velocity is overridden), causing it to not fire OnCollision events with the rigidbody it is sitting on

[tidal linden]

thats true, I could try applying gravity manually after the face then?

fact*

[stuck bay]

Getting weird bounds results

Raycast

[hexed horizon]

What is the cheapest way in unity to detect if world entity1 is within range of world entity2? and/or to get all entities within x radius of y position? I don't need exact collision model accuracy. A simple entity1.Sphere.Intersects.Entity2 would be ideal.

I am debating if its worth while implementing my own broadphase dynamic aabb tree for my purposes but I am not sure if the monobehaviour overhead would cut away most of the savings.

[stuck bay]

I saved this tip from a video, dunno if it's useful somehow 🙂

[stuck bay]

how much i can count on Renderer bounds?

                    Bounds bounds = meshRenderer.bounds;
                    bounds.size *= 0.5f;
                    bounds.extents *= 0.5f;

                    bool shouldRetry = false;
                    for (int m = 0; m < area.childCount; m++)
                    {
                        Transform modelM = area.GetChild(m);
                        if (!modelM || model == modelM) continue;

                        Bounds boundsM = modelM.GetComponent<MeshRenderer>().bounds;
                        boundsM.size *= 0.5f;
                        boundsM.extents *= 0.5f;

                        if (bounds.Intersects(boundsM))
                        {
                            shouldRetry = true;
                            break;
                        }
                    }

does this

boundsM.size *= 0.5f;
boundsM.extents *= 0.5f;
gets taken into equation whenn using Intersects?

hmm seems it does, at least one of these

[hexed horizon]

Raynaldo sadly not really. That is fine if I already have positions to check distancesqr against =). The challenge is getting the entities in question without looping through all of them or calling expensive physics queries. PhysX already does wht I am interested in. But I just need access to its broadphase check, don't want the more expensive stuff =).

[sterile lion]

Hey guys. I'm trying to detect if a line drawn on the screen (2D) overlaps a 3D object in my scene. Is there something similar to Spherecast and Boxcast? I'd rather not use Boxcast for this.

Actually Boxcast would not suffice for this. ☹️

[hollow knot]

raycast?

you trace the same line and check if it hit your 3d object

[sterile lion]

@hollow knot you mean to cast multiple rays along the line?

[knotty dove]

What's good practice for using mesh colliders? I've seen many people saying that you should never use mesh colliders for things other than things like terrain and trigger but also many people say that they use mesh colliders for everything physics?

[foggy rapids]

mesh colliders are expensive.

[knotty dove]

Sooo, this is a no go?

Just use box colliders?

[foggy rapids]

yeah

[glacial jolt]

note that there is a distinction between concave and convex mesh colliders. PhysX in Unity only supports convex for rigidbodies (concaves for statics). Convex mesh colliders can be useful for shapes that cannot be approximated by primitives, and use a different algorithm for intersection testing than concave

[stoic ivy]

how do i make a ragdoll make a pose?

for example i want my ragdoll to have his arm lift up in the air

[tidal linden]

I have an object with a kinematic rigidbody, and i want it to be able to detect collisions from a character controller, is this possible?

[mossy snow]

Does anybody have a tutorial on how I can make my 2D character slide like he is walking on ice?

[sacred hull]

I have an online game, and I want to remove character collision between online characters. Does anyone know how to do that?

[silent mural]

Reduce friction works very much like ice. Also reduce force applied when walking?

@mossy snow

Just a guess, never done it

[mossy snow]

dont know. I have a topdown game so my character never stays "on the ground"

[silent mural]

Ah how does it slow down then?

[languid walrus]

Hello guys, i have time understanding the utility of the function "Physics.BakeMesh". If i understand currently, it allows the thread executing it to bake and generate a mesh, but what's the point of that if a mesh can only be updated (triangles and vertices) on the UI thread?

[foggy rapids]

"prepares the mesh for use with a meshcollider"
you can do the baking wherever u want

[remote bear]

I have a question about MovePosition method and position property for rigidbodies (both regular and 2D)

When using those, when does the actual movement occur?

The docs say that if a rigidbody isn't kinematic, then the movement occurs during physics processing, but the description of when it's kinematic is way too vague

[distant coyote]

@remote bear all physics updates happen inside of FixedUpdate

MovePosition is unique in that it tests that the valid, where as transform.position will put the Transform there, and then on the next FixedUpdate the rigidbody will catch up (ignoring all penetration, and doing whatever it has to do)

[quasi knoll]

Hello everyone! does anyone know how to fix a problem like this

the weapon my player is weilding clips through the ground

how would i have this nOT happen?

*i dont think this is the right channel but i dont know which is the right channel

[tidal linden]

is there a way to have a fixed joint only effect one axis? for example I want a rigidbody to stay fixed on the Y axis, but still be able to move by its velocity on the x and z.

nvm, configurable joints seem to be what im looking for

[vernal rain]

@quasi knoll Usually for first person games, there are 2 cameras, one regular to see the world, and a second camera that renders the first person stuff only, on top of the world. This way nothing from first person view ever gets clipped through.

[quasi knoll]

aah yes! this is actualy the solution i went for, i already fidgured that out but thanks for helping!

[gritty sequoia]

How can I slow down my sphere once it reaches a certain area? Made a level where the ball rolls and once it reaches the finish section I want it to slow down

Is there a component I can add to an invisible box that makes the gravity heavier or something?

[sharp ruin]

Is there anyway that I can set an colliders isTrigger true for only specific layers? I mean that object will behave as it's in trigger mode and it will behave as it's in collider mode to the rest?

[weary plank]

What are acceptable vertex / polygon counts for MeshColliders on PC, URP, and they're the only MeshCollider of that size? Is 64k vertices a good upper limit? Or should I set it much lower?

(this is basically for a moon / asteroid you get to play on)

I have no performance issues so far but... I can maybe squeeze out 20k verts and usually they'll be around that level, but eventually the collisions will often not match up with the surface so I can't go to maybe 5k, for instance. Well. Perhaps. See why I need advice? 😄

(also - collisions are rare, it's a space game)

[winged garnet]

my ragdoll is basically moving in slow motion, im upping the mass to crazy high amounts on the rigidbodies but it still moves way too much and now in slow motion

a solution might be to loop thru each rigidbody and set the velocity to 0 but id rather not do that

[lone tinsel]

so I have a first person character but I move the character by Transform.Translate() how would I be able to move the character by rigidbody?

[cold cypress]

Maybe this will help: https://docs.unity3d.com/ScriptReference/Rigidbody.MovePosition.html

[lone tinsel]

thanks

[cold cypress]

no problem

[lone tinsel]

so I did it but whenever I collide with a object and continue to walk towards it my character starts to Jitter

[charred ocean]

What's the simplest way to detect collisions with walls/floors when using the CharacterController component? The grounding detection built into that seems to not work for what I'm doing

[thick jetty]

Okay, so I checked out brackeys tut on portals, and it works. But when I say rotate a protal 90 degrees with respect to the rotation of the other portal, the camera position gets messed up, and the render textures looks really wierd. Also, I figured out its the problem related to the movement of the render texture camera with respect to the position of the portal. Some help on this would be awesome.

[hushed pilot]

Has anyone ever worked on a top down 2d game (like 2d zelda) but also implement physics based things (like knock back on enemy hit, slippery movement on ice, sluggish movement in mud, etc.)?

[polar leaf]

I did a topdown spaceship shooter that had knock back

[polar leaf]

I did a lot of work in the past times with character controller. What are you looking for?

[charred ocean]

I just need something to check if the controller's colliding with a wall or floor

I've heard of spherecasting or raycasting, but I'm still slightly iffy on how those work exactly

[polar leaf]

things that worked well for me on this:

• mandatory: keep applying gravity even while grounded. if you don't apply downward force, your character will be considered not grounded
• really important: coyote time (so for gravity / ground movement, the player is considered grounded for some miliseconds after not being grounded)^. this works really well
• I have a raycast facing down for the player that I combine with the isgrounded check to check if the player is grounded. this helps with bumpy terrain. example (use this to check if it's grounded): _controller.isGrounded || Physics.Raycast(transform.position, -Vector3.up, 0.15f);

for checking for walls, just check the ControllerColliderHit.normal.y. grounds have normal = 1, walls = 0 and ceiling = -1. you need to play around with these values because of angles (for me a wall is anything with < 0.5 for example)

[charred ocean]

gggggotcha, I think I understand. I'll try this later and let you know how it goes :)

[stuck bay]

Could someone help with this?
https://forum.unity.com/threads/sphere-swept-collision-detection.1036855/

[ocean raptor]

What exactly are you asking? The paper's publication date or apparent simplicity doesn't mean it's a bad choice.

[stuck bay]

I just saw that in the new package he used some different algorithm, and I myself have used this for quite some time and know it's limitations, so was interested if something new was published somewhere

[ocean raptor]

idk of anything new in collision detection, seems like an application we have mostly figured out.

Like there's only so many ways to do an intersection test. And with a good spatial partitioning structure, you don't really need to worry about speed. There are papers still being published on ways to build and use those acceleration structures, but that's all I know.

[stuck bay]

I think you misunderstood what the paper is about

It's mostly related to character controller, not in general physics sweeps

It's about velocity projection on different obstacles

And not finding the hit itself

[ocean raptor]

I understand that. I'm just saying that the areas for improvement on top of this are pretty limited.

Like, I wouldn't expect some new thinking on how to project vectors. IMO academic papers are probably not the best place to look for "something new" in this instance.

[raven solstice]

Anyone able to give some assistance on a rigidbody velocity tweak? I'm instantiating a fireball at a player and shooting it towards the mouse, problem is the closer to the player my mouse is, the slower the velocity. I've tried normalizing the vector3 and just not having any luck.

position is the mouse position in world space, and the owner is the player its spawning from.

[ocean raptor]

My guess is that the forward argument in Quaternion.LookRotation(forward, up) is wrong. It needs to be an oriented direction. Right now, targetRot will face in the position - worldOrigin direction. You probably want Quaternion.LookRotation(position - transform.position).

wait, that probably won't fix the speed issue, sorry

[raven solstice]

I'm trying to get a constant velocity, just can't brain that atm 🙂

[polar leaf]

I've done this in the past, let me check

try to use rb.velocity = transform.forward * hSpeed;

on my case I used: transform.position += transform.forward * finalMoveSpeed * Time.deltaTime;

[raven solstice]

will give that a shot, thx

[supple pawn]

Hi, how would you guys approach breaking a 2d wheel without hacks or just "adding drag"?, I tried adding an opposite force but when it nears zero it oscillates. in order to stop the oscillation I just made a motor with target velocity 0 and high torque, but Its quite limiting

And I'm having weird results overall, either I set up the 2d physics wrong or there is an extra step in order to make it be somewhat physically accurate

[autumn dune]

So i followed the simple roll a ball tutorial, but i decided for the fun of it to rotate the entire map to make the ball move instead

i got the rotation and gravity to work

but if i have the map tilted all the way to left, and the ball rolls to the left side, then when i abruptly rotate the map to the right, the ball clips through the floor

i cant tell if this is a rigid body problem, or a coding problem

[supple pawn]

how do you rotate it

[autumn dune]

there may be better ways of doing it, but this is what i could come up with

[covert comet]

Hey!

I'm running a raycast that ALWAYS turns up null, using a ContactFilter2D with nofilter. Can anyone tell me why a ContactFilter2D.NoFilter is returning null even though my raycast is hitting things? (I am even drawing it with Debug.DrawRay and it's not working.)

[vernal rain]

how can you debug draw with a filter?

also haw is a raycast related to contact filter, isn't that for areas? @covert comet

[supple pawn]

do it with rigidbodies

[autumn dune]

rotate the map with a rigid body?

ah i see, i didnt know that you could rotate a rigid body, thank you!

[covert comet]

@vernal rain Well, I'm not trying to use a contact filter, but I do need to know the first two objects any given raycast hits.

Basically, a ball object is bouncing diagonally on the screen, and a raycast takes that velocity and is supposed to calculate the surfaces the ball will bounce off of so a CPU paddle can use that calculation to have a position to move towards

[vernal rain]

@covert comet here's one way to do it, with raycastall and a ray (velocity) https://docs.unity3d.com/ScriptReference/Physics2D.RaycastAll.html

probably need just the first hit with raycast regular though

[covert comet]

@vernal rain thank you so much! Literally this is all I need -- kind of a rough fix, but perfect.

[drifting sleet]

@stuck bay actually people use solutions like this all the time, in a lot of asset store packages

for example, the 2.5 corgi asset is essentially this

meaning specifically collide and slide

[polar leaf]

has anyone had to deal with checking the velocity of a collision but in the case of a character controller?

[zinc crown]

anyone have any idea why the rigidbody2d.velocity.y freaks out on this specific platform? It's at a constant 0 on other platforms, but drops to extremes on this one.
Blue lines near feet are ground sensors.

[tender gulch]

Is that platform different from others in any way?

[zinc crown]

nope

only thing I can think of that would do this was that I copied and pasted as new but

[tender gulch]

The numbers that you get are very small number. Close to 0.

[zinc crown]

yeah

[tender gulch]

can you take a screenshot of this platform inspector and a normal one?

[zinc crown]

a fix I found was just deleting it and making a new platform

[tender gulch]

Hmmm.

[zinc crown]

oh it's gone now, but it was the exact same, only difference was the size/location

run of the mill collider

I think it might've just been unity having rounding issues with the size/offset I settled on(?)

[timid shard]

Hi everyone. Am having a bit of trouble moving a simple 2D pixel character around a screen using rigidbody2D. Moving up, down, left or right is absolutely fine but if I press 2 keys at once to go diagonally (eg: up and right) the character does a weird little wobble and then smooths out. Here's the code I'm using on the gameobject:

public float moveSpeed = 50.0f;
public Rigidbody2D rb;
private Vector2 movement;

private void Update()
{
movement.x = Input.GetAxisRaw("Horizontal");
movement.y = Input.GetAxisRaw("Vertical");
}

private void FixedUpdate()
{
rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);
}

Is there anything I'm doing wrong?

The RB settings are as follows

I've tried setting interpolate to Interpolate and Extrapolate but it makes the general movement even worse. None seems to be the least buggy for me.

Any help would be appreciated. Thank you.

Right I've tried running this little piece of code from an empty project and it seems to work just fine with all the default settings. I'm guessing there's something else that's causing it.

OK I've figured it out! It was the screen scrolling code I'm using that was causing the trouble.

[raven solstice]

Anyone have any experience with "shattering" objects? I have two prefabs, rock and rock_broken. I have a script that destroys the rock, and instantiates the rock_broken where the rock was, but its "blowing up" for no reason when I instantiate the broken rock, I don't have any force modifiers being called. Super puzzling!