⚛️┃physics

[unique cave]

but it doesn't (as mentioned, I tried that myself some time ago). continuous is good for fast moving objects but is still tunneling on some cases like this

[versed shadow]

Fast moving objects is kind of a misnomer

It's just about your frame rate

I don't know why continuous doesn't prevent tunnelling in this case, it should

[unique cave]

well I'm not sure what you're doing but what I did was to have the first loop fixed in space and others can swing freely. not even continous collision detection can guarantee objects not going thru each other when stretched from both sides with large forces.

[versed shadow]

I think it might be an angular momentum issue, if it was simply two links being pulled with great force then CCD would never allow it to tunnel

Since of course the links in a long chain will rotate that might be what's causing the issue

[unique cave]

I don't think so...

let me experiment with this

[versed shadow]

Maybe one day we'll have quantum computers and collisions can be done a lot more efficiently

Then we can use more sophisticated algorithms

[unique cave]

yep, it has nothing to do with rotations

afaik two objects should never go thru each other (with ccd) but if there's third object and the object in the middle is pulled in both direction, you're in troubles. lemme show you

[versed shadow]

Yeah I had also considered it may be an issue with resolving collisions between more than 2 objects

But I'm almost certain if you only have 2 links and they aren't rotating you can pull them with whatever force you like and they won't tunnel

[unique cave]

that should be the case, but I'm not sure if that's still guaranteed. there may still be some edge cases when using compound colliders

[versed shadow]

For performance reasons it doesn't really make sense not to use joints anyway

[unique cave]

Like this. Plane is using mesh collider and doesn't have Rigidbody. Both balls have sphere collider. Both balls have Rigidbody with Continuous Dynamic Collision Detection mode. Smaller ball have mass of 1 and the larger have 200

[versed shadow]

That's very weird tbh

I guess if the small sphere is fixed and the plane is removed the issue isn't still there

If it is I just think the CCD algorithm sucks XD

[unique cave]

it is but on the other hand, you very rarely need that type of collision on real game application. game engine can't have "perfect" physics engine because it has to be very optimized

[unique cave]

yes. it works perfectly if smaller sphere is set to kinematic or Rigidbody removed

[versed shadow]

What a shame

Oh well in the future these problems will probably be gone

[unique cave]

I don't think you want to use collision based chain physics anyways so not really a big problem. If I set the mass of bigger ball to be 50, the problem is gone. That's just rare edge case that isn't a problem on 99.99% of games so who cares

[supple sparrow]

Nice !

[versed shadow]

Just for the little bit of extra realism it might be nice

[unique cave]

I believe that's not going to give any more realism on regular games with reasonable amount of forces applied from multiple directions. With more computation power you could obviously use some Two Minute Papers level physics on games but that's whole another story

[gentle chasm]

ok so if u freeze the y pos and have it bounce it doesnt bounce
why is that?

like a sprite moving across the grid

[glass kettle]

How i can fix this in Unity 2022? https://www.youtube.com/watch?v=xjoW_UAywVo

[neat coral]

what's the problem?

[glass kettle]

Rigidbody Interpolate in Unity 2022

[neat coral]

didn't watch the video in detail but it seems like there's a part where it's working as intended?

[glass kettle]

201* < 2019, 2020, 2021 - Correct
2022.* - Incorrect

[gentle chasm]

if u freeze the ypos a sprite with bounciness enabled wont bounce

When it hits something

[stuck bay]

Have you tried interpolation

there is something that i discordverederd

is that interpolation can have with calculations involving the coordinates of a moving rigid body

it seems that without interpolation, the calculations are based on the coordinates of the body in the last physics timestep

however with interpolation the calculations are based on an estimation if the rigidbidy within its current and next step

At the time between the current and next timestep that the calculation takes place

so its more accurate

[unique cave]

No. Interpolation only affects visuals, not physics. Physics are exactly same with and without interpolation but interpolation just smooths the look of movement so it’s not that jittery

[stuck bay]

Then explain why calculations involving the rotation of a rigidbody are correct only when the rigidbody has interpolation

i rly need an explanation sorry i didnt mean to tie that up to your question

this rly confuses me

[unique cave]

Now this confused me too 😂. I may be wrong too but that’s how I have been understanding it

[unique cave]

What you mean by this exactly?

You do that in update?

[stuck bay]

its the same result when the calculation is done in fixedupdate

It seems to rely on the interpolation of the rigidbidy

which seems stupid, i understand why you thought fixedupdate should do that and i thought that aswell, but it doesnt

[unique cave]

I didn’t mean to say it only affects ”visuals” but I wanted to say it doesn’t affect physics. Actual position and rotation of transform/rigidbody (not sure which or both) gets interpolated but collisions are still calculated with the same fixed rate

[prime flower]

When interpolation is turned on “rigibody.position” and “transform.position” will give different values

“rigidbody.position” will be the true position of the physics body while “transform.position” will be the position of the “fake visual”

[stuck bay]

im pretty sure my program uses the transform of the visual and not the rigidbody, is that the issue?

of course

it maks sense now thank yoy

[timid dove]

if you're making gameplay/physical/logic decisions based on it, then yes

[prime flower]

I think you might be dealing with a large physics timestep, and you are trying to solve inaccuracies there using interpolation instead of a smaller time step

Can you tell us what you mean by “the calculations lag in fixedupdate”?

[stuck bay]

Im getting the rotation of an object with a rigid body

the rigid body is rotating constantly with the angular velocity set to a constant value by code

[stuck bay]

it seems to give the rotation of the rigid body before it updates its rotation

so it has 2 rotations at t=0 and t=1
It gives the rotation at t=0 which is outdated because the rigidbody is already at t=1

[prime flower]

It’s not outdated in terms of the physics engine tho

[stuck bay]

no

[prime flower]

It’s outdated in terms of visual frames

[stuck bay]

ye

[prime flower]

There’s a key distinction there

Is the vector your trying to calculate going to be used for visuals, or other physics stuff?

[stuck bay]

yes its the velocity of a child object

[prime flower]

Then what you are seeing isn’t outdated and it’s the value you want to be using tbh

If you are using transform.position or rotation for a physics calculation with interpolation turned on, you’re gonna run into problems

Try switching to rigibody.position and I bet you’ll see that the calculation is laggy or behind again, even in Update()

@stuck bay what’s your physics timestep set to?

[stuck bay]

default

i havent checked because i dont want to change the timestep bc im having issues with one calculation, kinda feels like im giving up

[prime flower]

Are you running at 60fps or 144fps?

Because at default timestep, that means at 144fps you’ll be running physics 1 time for every 3 frames

Physics vs frame mismatches are more noticeable at higher FPS

[stuck bay]

if the default for 2020.3 LTS is 60fps then yes

[prime flower]

I mean what’s your monitor support?

60hz or 144hz

[stuck bay]

idk

[prime flower]

A fps counter is always nice for debugging

But either way

[stuck bay]

get the normal of the slope by passing a raycast on it then project onto the plane with the normal
https://youtu.be/cTIAhwlvW9M this video has a ni xplanaion if it

[split wedge]

I have an oddly specific question.

I'm doing bullet trajectories manually, as to avoid having to do massive amount of calculations per frame with the Rigidbody component.

However, the bullets only inconsistently detect collision.

Is there a way to use the Rigidbody continuous dynamic or speculative without just using Rigidbody physics?

Because I'm going to have enough bullets that Rigidbody physics calculations won't be viable.

The relevant part of my physics sim code is as follows:

    {
        if(!isInitialized)
        {
            return;
        }

        if(startTime < 0)
        {
            startTime = Time.time;
        }

        RaycastHit hit;

        float currentTime = Time.time - startTime;
        float nextTime = currentTime + Time.fixedDeltaTime;

        Vector3 currentPoint = FindPointOnParabola(currentTime);
        Vector3 nextPoint = FindPointOnParabola(nextTime);

        if(CastRayBetweenPoints(currentPoint, nextPoint, out hit))
        {
            Destroy(gameObject);
            Debug.Log("Hit object: " + hit.transform.name);
        }
    }

    private void Update()
    {
        if(!isInitialized || startTime < 0)
        {
            return;
        }

        float currentTime = Time.time - startTime;
        Vector3 currentPoint = FindPointOnParabola(currentTime);
        transform.position = currentPoint;
    }```

[prime flower]

collision in this case is your raycast?

or are you racasting on top of relying on OnCollisionEnter?

or OnTriggerEnter

[split wedge]

In this case, I generate points according to a physics formula, and move the bullet from point to point, creating a nice, good-enough looking arc trajectory

And the bullet has a box collider on it

[prime flower]

idk why i can't type a code block with tildes anymore

[split wedge]

And the collision is assisted by casting a ray from current point to last point

to see if it hit anything

[prime flower]

yeah so if you're raycasting, isn't that skipping any sort of collision detection completely?

I.E raycasting can't be discrete or continuous, it's just raycasting.

[split wedge]

The weird part is how inconsistently my collision works

Sometimes it will properly detect floors and walls

[timid dove]

in theory what you have should work pretty consistently

but

I'd like to see the rest of the code

[prime flower]

I agree

CastRayBetweenPoints

mainly

[split wedge]

alright gimme a sec

    {
        return Physics.Raycast(startPoint, endPoint, out hit, (endPoint - startPoint).magnitude);
    }```

[timid dove]

and also there's a caveat with raycasting - it doesn't detect objects that the ray starts in

[prime flower]

if you're bullet is already inside of the object

[timid dove]

oh this is straight up wrong too

You're using it like LineCast

you should just use LineCast if you want to do it this way

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

[prime flower]

Wow didn't even know about that one cool

[timid dove]

return Physics.Linecast(startPoint, endPoint, out hit);```

Linecast takes two positions (like you have)
Raycast needs a position, a direction, and a distance

you are improperly providing a position as the direction parameter

that probably explains most of your issue

[prime flower]

CastRayBetweenPoints is his own function though so we're not sure if he's already accounting for that

[timid dove]

?

[timid dove]

He just showed the code here

[prime flower]

is it not?

[timid dove]

it's doing a Raycast, improperly

[prime flower]

lmfao whoops

well he was on the right track

direction should just be (endPoint - startPoint)

[split wedge]

welp apparently that was the issue
got bad advice for that a while back
did about 50 attempts, with perfect collision detection

[prime flower]

@split wedge basically you were raycasting in random directions lol

[split wedge]

Still got a lot to learn with proper raycasting still lol

seriously this problem has plagued this project for a long time thanks

[prime flower]

hey you fixed your code and learned how to replace some of it with a cool built in function!

[split wedge]

always nice to not have to reinvent the wheel

[stuck bay]

idk if you can see this but the script does in fact reference the visual frames as you guessed correctly (Transform gridTransform - a declaration of the visual transformation of the object with the rigidbody component and not the rigidbody itself)

i just thought it would be more efficient because i only wanted to reference the transform attributes of the rigidbody
But for that they would need to have equal transforms

which is possible for an rigidbody of course only if it is synchronized with the object’s visual frames, which is what Interpolation or increasing the physics steps does

[stuck bay]

anyone know how to make the physics of this game better?

https://www.youtube.com/watch?v=U1T0xCLU5do&t=32s&ab_channel=TechnoGeek

[stuck bay]

can anyone tell me why the friction's not working

[neat coral]

you are trying to make your character move using the friction of their feet?

sounds like a very bad idea

[timid dove]

how are you moving the character

[stuck bay]

animation

[timid dove]

so why would friction do anything?

[stuck bay]

yeah i need it to make the realistic collisions afterwards

[stuck bay]

well the feet have colliders, so friction should work

[timid dove]

Animations don't really work with physics

they just kinda teleport the stuff around

at best you use this https://docs.unity3d.com/ScriptReference/Animation-animatePhysics.html

and in that case - well read the caveats in the documentatioin

it's not gonna move the guy around the way you want

[stuck bay]

i see

[stuck bay]

so i guess friction will only work with force like things?

[timid dove]

it only works with Rigidbodies

in the first place

[stuck bay]

what if i apply force to the legs, should work?

[timid dove]

and there needs to be actual physical rigidbody motion for it to do anything

if you apply a force to a non-kinematic rigidbody, it will accelerate, sure

[stuck bay]

um okay, i'll try smthn tnx

[prime flower]

Physics and animations don’t mix well

I work on a lot of physics focused games and normally I have to start with physics and then lay animations on top of that

Instead of starting with animations and relying on root motion

[sage ice]

Im having an issue with mesh colliders not colliding but box and capsule colliders are. I'm not sure how to fix this (all the colliders are set to convex btw)

Might someone be able to help

[stuck bay]

i compared it to a working example and here is what i found

this is what the working example uses to access the rigidbody transform component

gridTransform = other.transform;

and this is how the not workng example references it

shipTransform = other.GetComponent<Transform>();

i changed it to shipTransform = other.transform; however im still experiencing the same problem

what i dont understand is why this method works for one script but not another

[stuck bay]

its a rotation offset
visible at higher speeds

its because its parenting after the parent gets a non-zero rotation offset
which is a script execution order issue

[stuck bay]

the other setup doesnt have that issue bc its ordered in-script
ig the issue just wasnt visible with less extreme angular velocity

[twin nebula]

So I've made an active ragdoll balance and play walking animations and stuff (with AddForces and a bit of maths). My method of moving the character around and to balance it is to have an invisible sphere underneath it that rolls around and stuff but the issue is whenever I move, since my player's hips are attached to the ball by a spring joint he kinda just rolls with the ball. Is there a way I can make the hips stay connected but not rotate with the ball?

I'm rotating the ball with AddTorque

[haughty scaffold]

hi, should i update an object's velocity in fixedupdate or update?

im currently running this code in fixedupdate, would this object accelerate at the same speed on 144hz vs 60hz?

[unique cave]

Your monitor refresh rate doesn’t affect anything unless vsync is enabled. The acceleration in fixedupdate should be independent of your monitor hz and fps (because fixedupdate happens at fixed rate). Changing the physics timestep can change it tho

[haughty scaffold]

got it

what should i keep my timestep to? i think i set it to 1/90

[unique cave]

The default of 1/50 is usually pretty good. Interpolation takes care of the little jittering

[timber pelican]

is there a velocity equivalent of transform.forward?

i'm trying to apply velocity along forward vector

[unique cave]

… just set transform.forward to velocity?

[timber pelican]

yeah didnt realize transform.forward was a vector3

thanks

[prime flower]

I feel like 60/120hz physics are way more common in games than 50hz

[light hound]

greetings. I have some small dice. 0.004 mass, and 15 mm in unity. When I throw them, when they land and stop, they like to continue to slowly rotate around the y-axis even though they should be all rights not be moving anymore. I have dynamic friction set to 1.

why do they keep rotating?

[unique cave]

I don't know if this is the problem here but large and small colliders together may cause some very weird jittering. what type of collider is the one the dice is landing to?

[light hound]

large table with a box collider

[unique cave]

you could try to use mesh collider for the table instead

[light hound]

hmm. these dice are using mesh colliders. i wonder if switching to box colliders would help

oh weird. i would think primitives would get better results than mesh

[unique cave]

in this case I have heard mesh collider is better than primitives. especially two primitive colliders with large size difference produces some jittering problems

id probably try box for the dice and mesh for the table

[light hound]

tried changing them both around. mesh, box, vice versa. same issue. i may just get y delta pos, and when its not moving in y, set all velocity to 0

[sage ice]

Might someone be able to tell me why my mesh colliders arent colliding but every other collider is?

[sage ice]

nvm fixed it

[wicked phoenix]

Trying to create some ragdolls on this model. These ranges mean the arm should be able to swing forward and side to side, right?

[young jolt]

Not sure if this is the right channel, but does anyone know why this happens, I just added ragdolls and they just kinda float away, Use Gravity is checked on the rigid body

[unreal linden]

I would recommend 1/60, because of dividends and mapping. So at 60hz you have a 1:1 map, 1:2 at 120... results in higher perceived smoothness due there being no “phasing” essentially between frames. Interpolation can of course do either, but it just tends to be a bit more accurate this way since you have more regular input data.

[timber pelican]

does Rigidbody have a method to move an object over one frame only, while also checking for collisions?

my issue is that Rigidbody.velocity and .movePosition rely on the object's drag coefficient, so the object's movement is spread across multiple frames.
i'd rather have it move on one frame only. So far, I only know of Transform.Translate, but that causes collision jitter

[stuck bay]

hello, does anyone have knowledge about wheel colliders not colliding. cant rotate as have realised. but once aligning the wheels with the colliders, not long after. they rotate another direction... does anyone know how to fix this issue? or any advice

[viral ginkgo]

@timber pelican maybe you can do boxcasting or spherecasting to solve your problems

you'd box/sphere cast and move the shape afterwards

[swift egret]

question: if i have a 2d scene with a bunch of objects forming a "wall" like the tree sprites do here, is having every one of them have their own collider and rigidbody (like the single selected tree sprite where the bird is sitting would have) hell for the performance or does it not matter

furthermore how much more intensive are polygon colliders compared to the given 2d collider shapes (rectangle, circle, capsule etc)

[neat coral]

you can probably approximate the bird tree with a rect

[prime flower]

Nope not really

[timid dove]

MovePosition

it does not care about drag at all

[timber pelican]

Maybe, but I still noticed the movement on the object was still spread over multiple frames. That's an issue for me because I need to sync position of the object to other players, but any position data I send to others is already old data because the object continues to move on the next frame on the server.

[timid dove]

Don't confuse game frames with physics frames

MovePosition abides by interpolation settings on the Rigidbody

but the movement happens over exactly one physics frame

[timber pelican]

Ok, I'll try it again. My rigidbody had no interp on, so I'll see what happens if I change it.

[timid dove]

you may also be seeing some interpolation from your networking framework. Depending on how things are configured

there's a lot of factors at play

[timber pelican]

I debug.logged the position data sent on the server and received by the client, and both were the same. Changing movement to transform.translate did not have movement discrepancies, so I don't think it's that. Both are on local computer for now, so shouold be very very little delay

[timber pelican]

Oh wow it's a Unity function, I'll have to take a look!

[timid dove]

are you reading Rigidbody position or Transform position

[timber pelican]

i read Transform.position

[timid dove]

should generally be reading the RB position, as that won't be subject to any interpolation from any sources.

[prime flower]

https://streamable.com/o1v6di

the hands are almost all IK + hand poses lol

[silk sun]

Hey I have a problem, my object stops to bounce if the velocity is low, how can I fix it?

[shell night]

i don't get how angular velocity works. it says it's radians/s, yet a value of ~157.104 results in 1 revolution/second !?

am i missing something obvious?

[neat coral]

increase bounce in the physic material

oh no

the opposite

reduce friction

[silk sun]

yes yes someone helped me already. thank you

[jovial wraith]

that could be an aliasing problem. 157 radians/sec is ~25 rotations per second, which happens to line up quite closely with 0.5 rotation per fixed update. So it might be doing almost a full rotation every 2 fixed updates and you only see the small deviations.

Same issue as this video shows: https://www.youtube.com/watch?v=uENITui5_jU

[shell night]

i figured it out. i was mistakenly doing an angular velocity conversion with Rigidbody.transform.InverseTransformVector instead of Rigidbody.transform.InverseTransformDirection

once i fixed that, the values started to appear sensibly

[jovial wraith]

damn, I was excited for aliasing to show up as a real issue in physics rather than just rendering

[shell night]

hehe, well i did have to divide by fixed delta time to get an almost perfect velocity on each update 😉

[split wedge]

hey uh weird question
is it normal for objects with rigidbodies to fall even with no gravity?

[shell night]

no, but you probably have gravity and you just don't know it

[split wedge]

apparently restarting unity fixed the physics weirdly enough

[prime flower]

I have weird shit like that happen to me all the time

where physics material all of a sudden lose all friction lol

until I restart the editor.

Compiled builds are always fine though

[fair oyster]

How can i create IK

Using blender

For Unity 2020.1 LTS

[turbid geyser]

I assume this is a beginner question. I'm getting familiar with Rigidbody Physics and am having a challenge that I'm having trouble researching. I assume the right person will just know that answer 🙂

I have two player controlled characters. When one is hit I apply force to their RigidBody (dynamic body type). When a player moves I call MovePosition in order for there to not be a feeling of velocity when moving.

At this point in time I'm not preventing movement during a push and what ends up happening is the movement removes all of the velocity from the push. For example if I'm pushed to the right while the player is running up I'd like the character to continue progressing up but be pushed right simultaneously, allowing the pushed player to fight against their velocity of the push if they so choose.

Any help would be appreciated

[prime flower]

As soon as you use MovePosition to move an object, you're basically removing that object from interacting properly with physics forces.

[twin nebula]

Is there anyway I could get my Rigidbody to constantly stay up with a torque? What I have now is a character standing on its legs with target rotation but I don't think there's a way for me to keep my character upright with target rotation without having it always point in one direction. Correct me if I'm wrong

[prime flower]

If you aren't moving an object purely with forces (velocity), you won't be able to achieve true physics responses

MovePosition is a function that in essence teleports the object, and any collisions that happens in between will not be treated with actual collision responses you expect.

[turbid geyser]

Hm... Okay. Sounds like I need to design around it then. Either prevent movement during push or use velocity for movement.

Thank you for your insight

[twin nebula]

Ok so scrap what I said

Is there any way to only control the X and Z angular drives?

[wary roost]

I am trying to set up collisions between the player (has a box collider + a kinematic rigidbody) and a tree (has a box collider), but I just cannot work it out. I want the player to simply stop moving when reaching a tree 🌲

I am using 2d sprites in a 3d world, so I cannot add gravity to them, but I can freeze their position*. Is there a way to fix this? Tried so many things but got nowhere so far

[timid dove]

I don't understand how the fact that they're sprites or not is relevant

The Renderer is not relevant to how it moves

Is there a reason you want to use a kinematic body?

If you're using a kinematic body you'll need to do all the collision detection yourself with e.g. BoxCasts

[wary roost]

yes, the movement script the player uses does movement through the rigidbody component, and I've been reading if I want something to move I need a kinematic body for that

and if gravity is involved the object will either fall to the ground, or flies away if I disable it (since all the sprites are 60 degrees rotated on the X axis)

[timid dove]

What does the rotation of the object have to do with "flying away"? And yes gravity makes things fall that's what it's there for.

Where are you getting the idea that only kinematic bodies can move?

Here's what a kinematic body won't do:
-collide with anything or be stopped by any obstacles.

[hard valley]

why does my wheel collider not collide

and no, it isn't rotated

and it is in a seperate child object under my car

[mortal venture]

I have a projectile that moves 350 meters per second, and i need to know if it collides with anything by Physics.OverlapSphereNonAlloc or Physics.OverlapSphere, my projectile is supposed to penetrate through some objects, and that's why i use overlap sphere to gather information about what it hit, and if it is penetrable, but OverlapSphereNonAlloc and OverlapSphere doesn't work, and i think its because of the speed the projectile is going, can anyone help me fix it, or have any better idea to implement penetration?

[lapis plaza]

@mortal venture there probably isn't good reason to keep that physics simulated rigidbody in the first place, just sweep it

[mortal venture]

if u mean why i don't use rigidbody, it's becuase i need penetration, rigid bodies didn't work for me

[lapis plaza]

oh I thought you were using RB already and that was causing your issues

but yeah, you could just sweep test the hits

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

[mortal venture]

oh maybe it will work, thx!

[hard valley]

why does my wheel collider not collide

With mesh colliders

(Non convex)

[carmine basin]

Is there a way to set the linear limit of a configurable joint in script?

its giving me this error

"Cannot modify the return value"

I want to set it to my blade's stab depth but the IDE is telling me that I can't because even though it has the whole {get; set} thing, it just isn't doing it

my current workaround is creating a new SoftJointLimit, assigning stabDepth to that and then assigning the new SJL to the joint

which seems to do it

[carmine basin]

I've got a solution now

[prime flower]

just store the current SoftJointLimit in a variable, then modify that, then set the joint's SoftJointLimit to the stored variable

[peak cloak]

I'm making a car racing game with the wheel collider and it was working but once I added the mesh when it touches the ground is starts shaking violently how can I fix that

[hard valley]

same but my collider does not collide at all

[amber bay]

with a floating object, I am applying a force of X to the rigidbody. If I double the mass, will I have to apply a force of 2X to get the same movement

[timid dove]

that is how forces work, yes

assuming you are using ForceMode.Force or ForceMode.Impulse

There are mass-independent force modes too - Acceleration and VelocityChange

[amber bay]

ok thanks

[slate lily]

https://youtu.be/_umVJEBXFcQ

Iamma explain the prob
The player is hovering at height of 0.25
And the player Is an overlapped box with penetration vector and velocity projection vector that minimise the velocity if your touching wall so u dont clip into it the offset I mentioned above messes up the projection on the y axis so idk how to fix that

[wheat thorn]

How can I lock my player to a chain(using hinge joints)?

[timber pelican]

is there a way to check if two object's colliders are intersecting, externally from objects?

so imagine 3 hierarchy objects: observer, box1,box2.

can I as Observer detect if box1 and box2 intersect?

[kind pilot]

hello unity folks, i made a car controller, followed this tutorial https://www.youtube.com/watch?v=Z4HA8zJhGEk
but why don't my car move?

oh apparently inputs

are the issue

[peak cloak]

same to what

[hard valley]

Wheel collider

[peak cloak]

oh I just added a collider then it slowed down the shaking so now I'm going to leave it as car engine

[eager dove]

if my 2d character falls a long ways it kinda pancakes, it seems its rotating on a 3d plane but it dosent show any signs of doing so, please help

[stuck bay]

Hey

My mesh isn't colliding with the cube

Did I forget something?

[carmine basin]

@stuck bay does your cube have a collider too?

[stuck bay]

yeah

[carmine basin]

huh

[stuck bay]

this is from the second picture

[carmine basin]

are they on layers that don't collide with each other?

[stuck bay]

I haven't set any layers

They are both on default

[carmine basin]

oh

hang on

your mesh collider and mesh filter don't have a mesh assigned

[stuck bay]

?

[carmine basin]

oh

hm

perhaps not that hten

[stuck bay]

I think it's the correct one

[carmine basin]

is your cube spawning inside the mesh collider?

[stuck bay]

I don't think so

I just added a new cube

[carmine basin]

im honestly not sure what's going on here

[stuck bay]

Me neither

Is there anything weird going on with the code?

[carmine basin]

I dont think so but i dont really know about mesh generation. Could it be that you need to bake the mesh on the collider?

[stuck bay]

How would I do that?

[carmine basin]

maybe not then, Mesh and meshfilter dont appear to have a bake method

damb

im honestly not sure

[stuck bay]

I tried asking in beginner code and someone told me it's not a code question and to ask in #⚛️┃physics

burh

Thanks for trying to help me though

Mr goose

I appreciate it

[prime flower]

I’ve never created a shape with code before, but is there any chance your normals are backwards?

[stuck bay]

I didn't make the normals

Unity does it for me

[prime flower]

And if you use a mesh collider without creating the shape manually it works?

IE assigning through editor?

[stuck bay]

Good question

Imma try that

[prime flower]

That would narrow it down to code

[stuck bay]

It does in fact work

Hmm

That is very weird

I mean

the mesh looks fine

But it just clips through

wtf

[prime flower]

@stuck bay is there a reason you want to do it via code?

[stuck bay]

yes

Because I want to learn about it

[prime flower]

That’s fair just curious if there was a technical reason

[sharp dove]

does anyone know about car physics?

[shell night]

if the camera is the cause, check your culling settings

[languid hazel]

I'm having an issue where collisions are occurring even though the physics layers are set to never interact in the project settings. Does anyone know what could be causing this?

The first image shows my layer collision matrix, and the second shows the character hierarchy and the problematic collider.

[timid dove]

show the inspector for the Player object?

[languid hazel]

It has a box collider, but it's disabled when I'm testing the collisions between the "AirbornCollider" game object.

[timid dove]

double check that that collider is actually disabled at runtime

also it's possible your movement script itself is doing the collision checks

[languid hazel]

When I manually go into the inspector for the "airborn collider object" and disable the collider, the player can move through the object just fine. That leads me to believe that it has to be the airborn collider that's preventing the movement.

\

Yeah, during runtime the collider is still disabled.

I don't know, I feel like it's probably something obvious that I'm completely missing, but I just can't figure it out.

[timid dove]

are you sure you used 2D physics settings for your layer settings?

Or did you disable the collisions in the 3D settings?

I think that's the 3d one, as cloth settings aren't a thing in 2D 😛

[languid hazel]

Yeah, that was it. Thank you1

[iron wing]

Hey everyone, I was wondering what caused this weird issue with hinge joints, why are they shaking like that when I enter in collision with it?

[kind pilot]

how do i use parent constraints?

do i use it on the parent or the child

[kind pilot]

ok nevermind

parent constraints is kind of jittery

[timid dove]

Neither. The two objects should not have an actual parent child relationship

It simulates that relationship without them actually being parent/child, and allows you to freeze certain axes etc.

[kind pilot]

i already know now

but the car seems to be jittery

when i use the parent constraint to the chase cam transform now

[empty sand]

I am working on a multiplayer project where the server needs to substep each player's simulation separately, so my plan was to achieve this with multiple scenes and additive loading. The idea is that the main scene should contain the map geometry and each player scene should operate and do its substepping within that.

So far, however, I can't get it to work unless I duplicate the map geometry as a prefab in each subscene, which can't be right.

Here's my scene generation code:

playerObject = NetworkManager.Instantiate(playerControllerPrefab,
  Vector3.zero, Quaternion.identity);
playerController = playerObject.GetComponent<PlayerController>();

if (IsServer)
{
  scene = SceneManager.LoadScene(SCENE_NAME, new LoadSceneParameters(
    LoadSceneMode.Additive,
    LocalPhysicsMode.Physics3D
  ));
  physicsScene = scene.GetPhysicsScene();
  playerController.SetPhysicsScene(physicsScene);
  SceneManager.MoveGameObjectToScene(playerObject, scene);
}

If I don't duplicate the map prefab, the player object just drops through the floor plane and falls forever. Otherwise it works fine, so the substepping is working, but the multi scene collisions are just not happening. Any advice?

[timid dove]

If you use multi scene physics, you get what you paid for. Completely separate physics simulatons per scene

Objects need to be in that scene in order to be interacted with by other objects in the scene. This naturally includes your "floor plane"

[empty sand]

Is there a better way of substepping multiple player objects concurrently in one scene? Or is duplicating the map a pretty normal practice for Unity physics?

[timid dove]

Multi scene physics itself is pretty unusual in and of itself so I can't comment on what's normal practice

[iron wing]

Hey everyone, how could I make hinged doors that interact with a character controller?

[stuck bay]

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

This says to ignore layers pass a layermask and only select the ones you are interested in....

But its colliding with other layers that I haven't selected still?

Physics.Raycast(ray, out hitInfo, layermask)

Is this a unity bug?

2021.2.19f1

[iron wing]

Could you show me your code? :p @stuck bay

[stuck bay]

RaycastHit rinfoSlope;
Ray rSlope = new Ray(transform.position + walkDir, Vector3.down);
if (Physics.Raycast(rSlope, out rinfoSlope, layermask)){

  charactercontroller.Move(walkDir);
}

LayerMask is an inspector field:

    public LayerMask layermask;```

but it also picks up NPC layers... why..?

Debug.Log("Hit : " + rinfoSlope.transform.name + " > " + LayerMask.LayerToName(rinfoSlope.transform.gameObject.layer));```

Any clues? :c

[iron wing]

Add the layermask here : Ray rSlope = new Ray(transform.position + walkDir, Vector3.down, layermask);

it seems like you're using a raycast to cast another raycast

In my own code :

I don't use this line there :

[stuck bay]

it is there though?

Thats just a ray

uhhh

if i instead use this it works:

Physics.Raycast(rSlope, out rinfoSlope, float.MaxValue, layermask)```

This picks up wrong layers:

Physics.Raycast(rSlope, out rinfoSlope, layermask)```

i had a similiar problem in this project before and that solved it there too...

oh i remember why >.>

its using the wrong overload ....

[iron wing]

I think it's because you forgot to add the max distance yeah

[stuck bay]

yeah and no error becuase LayerMask converts to int

.>

damn..

such a stuupid mistake

[iron wing]

it happens ¯_(ツ)_/¯

[hot escarp]

not sure what channel to ask this in but: Is there a way to make a rotation of a 3d object the new 0?
ex. I have a capsule and I want rotation 0,0,0 to be what would currently be 0,0,90 or it laying on a side.

[timid dove]

You have to edit the mesh in blender or ProBuilder or wrap it in an empty parent object

[iron wing]

A simple way to do that without editing anything out of Unity, would be to give your capsule an empty parent, and then add the components & scripts needed to the parent instead

[loud tide]

How do you all deal with 3D characters / AI / etc that have unintended collisions with other things and it causes your 3D objects to pop up high in the air. Do you put a invisible ceiling to stop it? Kill zone? Check for Y and if > some # despawn? Do you modify the rigid bodies and etc? An example is spawning out of a simple object spawner, say you spawn and the object doesn't move, now you spawn a second one directly in the first and it pops straight up. I am going to get around this specific instance by just not spawning if there is a object in the way, but I do randomly get pops on stuff like dashing into things etc.

[timid dove]

• don't spawn things on top of each other
• don't let your object pass through other objects (Make sure you're moving your objects in physics-friendly ways)
• disable collisions between those objects entirely if you want them to just ignore each other

[loud tide]

do you recommend kill floors or ceilings for any stray gameObjects that escape the reality of my game 😄

or not really and its better to try to not have things pop than kill them off if they do

[timid dove]

it's better not to have them escape reality, but it's also not a bad idea to have something in place to handle them if/when they do anyway

You can't necessarily foresee all the issues and the internet is full of videos of people "getting out of the map" in... basically every game ever made

[loud tide]

ok. ill see what i can do thanks

[empty sand]

maybe a better way to phrase my question: what is the best way to isolate and substep a single rigidbody within a physics scene using Physics.simulate? is there a workaround using the RigidBody.isKinematic property?

[viral ginkgo]

@empty sand I guess thats why you'd wanna use a kinematic character controller for multiplayer

It shouldn't be too hard to convert your character to use capsulecast?

There's this recursive step you need to do where you cast some capsules and get some projections
To slide along surfaces in 2d or 3d

https://images-ext-1.discordapp.net/external/UoeobnZ86wPoZUZSZKpAeqyh-TCTxMAbnGy3rZ1Q6pc/%3Fwidth%3D358%26height%3D357/https/media.discordapp.net/attachments/85593628650504192/812597204656455680/unknown.png
Maybe this helps

[buoyant garnet]

Hi guys
Using a "Hinge Joint" why it sometimes completely breaks like in the footage below?
I set the axis to forward (positive Z) shouldn't it be locked to that axis? why it jiggles like that rotating in other axles..?

[eternal lichen]

Anyone knows why the first one doesn't collide but the 2nd does

[neat coral]

is that at runtime?

[timid dove]

nothing specifically about these colliders/rigidbodies would prevent a collision per se. What are you expecting it to collide with?

[eternal lichen]

A mesh, I already fixed it, idek how it worked but I just changed their y from 100 to 102 and it works lmao

[stuck bay]

why is the box collider inclined? any way to change it

okay i got a solution, adding empty child object

[iron wing]

Bumping this because I also have this problem, and nothing online fixes it

[buoyant garnet]

Well.. if you just after a workaround, this issue caused by 2 physics objects at the end of the "bridge". when the ball pushes the plank too hard it goes fast beyond your limits and through these two objects.
The "bug" (IMO) is that the hinge then ignores your min\max and axis limits.
I just removed those two objects and now cannot reproduce this glitch.. but this hinge issue isn't fixed.

[iron wing]

Another problem I got with hinge joints is that the hinge himself can be moved?? If you push against the object, the hinge & the objects can be pushed around, and there is no option to make the hinge / anchor FIXED and immovable

[prime flower]

If the rigidbody the hinge is attached to is kinematic, that won’t happen

[iron wing]

it does :/

[rocky coral]

Hi all, I have some cars which when they collide with each other they just float upwards, like they're ignoring gravity, but they both have mass, gravity, rigidbody and colliders, does anyone know what might be the issue?

[prime flower]

Idk how you have moving kinematic bodies

But something sounds seriously wrong there

[iron wing]

I just tried and my bad, it doesn't happen anymore. But now, they don't even rotate

[prime flower]

Well only one of them should be kinematic

The object that should move on the hinge should not be kinematic

[misty mauve]

Ok, so I've been working on this for a while and I cannot figure it out. I'm trying to "lock" two game objects together rotationally. So if one rotates, the other rotates the same amount. (think like a Fixed joint. Where if one object moves it moves the other and vice verse. And if one object collides with a wall it stops the other for moving too... except for rotation) I'm not trying to have them rotate around each other so I can't parent them. They need to move independently of each other. but rotate together. I've been trying to find the source code for the Fixed joint but no dice. I cannot figure out how to do it. The real problem comes with I'm turning object A and object B collides with something. the physics engine handles the collision and I can't find a way to get it to use that information to stop Object A. Anybody have any ideas? My team and I have been working on this for a week and a half now and we cannot figure it out.

[neat coral]

2d or 3d?

[stuck bay]

use target rotation of ConfigurableJoint

[runic harbor]

I'm going crazy... when I add a mesh collider to my wheels and check the convex options ( must be convex cus the car has a rigidbody ) the colliders arent round... any way to fix this? I tried using sphere colliders but the results are horrible.

The mesh itself is pretty round in blender

This only happens when i don't use "Apply transform" during FBX export... If i use "Apply Transform" the mesh collider is round. However the axis are incorrect relative to unity axis...

I'm going crazy with this

So basically:
-No apply transforms: mesh collider not round, but wheel axis aligned with unity axis
-Apply transforms: mesh collider round, but wheel axis not aligned with unity axis

[timid dove]

Wdym by "round" or not

[runic harbor]

if you see the first picture the green collider is not round but more like an hexagon

last picture it's completely round and follows the wheel perfectly

[runic harbor]

this results in an undrivable car

[jovial wraith]

You can change the axes in blenders fbx export window to match unity.

[runic harbor]

fixed it by unflagging "use space transforms" in the fbx export

[tough path]

How can I stop my camera jittering when.I rotate with my Rigidbody player?

I tried setting the rigidbody's extrapolation to on

that didn't work

and I tried making the camera a separate object and having it slowly follow the player

but that doesn't work because it's a multiplayer game and I have to keep the camera as a child of the player

Any ideas?

[neat coral]

why do you need to keep the camera as a child of the player?

[tough path]

Because I would have to have the prefab be the container for both the player and camera

but I don't want to do that because I have to put my NetworkIdentity (using Mirror) on the container

[neat coral]

so what

[tough path]

wym

oh

sorry

[neat coral]

then do that

[tough path]

No I can't because my player has a NetworkRigidbody component

and the child cant have it

[misty mauve]

That changes the desired angle of the joint as a whole with each game object on both side... thus moving each game object to a desired position. Im looking to just rotate each object in whatever its location in. We tried that option and cant get the desired results

[misty mauve]

2D. Sorry should have mentioned that

[stuck bay]

oh yeah my bad, you should use script actually

wrong tag

wait configurableJoint can actually rotate whole gameobject

[vast abyss]

hello i want to make a active ragdoll character im not sure which joint to use (i dont want a gang beasts or human fall flat kinda character i want to have lots of control over the character kinda like the character feels light and not very heavy i want to make it so the arms legs and head like wabble around alot)

[hasty solstice]

How do I prevent enemies from pushing me around if they use a rigidbody while i use a character controller? the cc doesn't have a kinematic tickbox option, so i'm lost

[frigid pier]

If you just added rigidbody on character controller, it was not designed to use one and will conflict with it. Like I've mentioned I haven't used it in practice but probably it involves manual handling of all interaction events with it if you want interaction. You should find a tutorial illustrating how to setup interaction with CC properly.

[shrewd shoal]

how can I control which objects can interact with other objects but not allowing them to go through each other, basically some physically interact with each other and others treat each other as kinematic but they are not (that way they can use gravity)? pls ping on reply

because using Physics.Ignore allows them to go through each other and so does changing the layer interaction to ignore each other

and also is this even possible because it would be kinda wack if you cant have 2 objects not push each other and gravity at the same time

[muted wave]

hey so I have a bug in my racing game where when the player(a sphere collider) is on the road sometimes it just jumps like in the video if I get two blocks and let the player drive between them this also happenes so I am gussing when it goes bettween these it thinks it should kinda jump but the height differnce of these colliders (the two ground) in minisculare to nothing so it shouldn't do that and for the road I am using a mesh collider and I the ground isn't fully flat because somewhere in the road it goes up

[timid dove]

The best solution to this is to make your whole track out of one seamless mesh. This is a pretty common problem and can be googled

[potent ice]

Hey lads, have a question: I wanted to make a game where the player swings using a chain. The chain is made up of 4 links which each have a Rigidbody2D, CapsuleCollider2D and a HingeJoint component. The chain is then connected and parented to a square sprite with Rigidbody2D and is kinematic. This square is the parented to the player. The chain on it's own works great, but whenever I attempt to move the player it just falls appart. Also the collisions between chains and player are turned off in the Start(); function. Anyone knows a fix?
I will send some pictures and a video.

Inspector of 1 Link

Inspector of the square parent

Hierarchy

Joints

Video:

There is no script written for the chain btw

oh and please ping me if you answer

[potent ice]

Fixed it, I just had to use a force rather than position to move my player :D

[muted wave]

but it's already one mesh yeah the walls are a differnt mesh but it "jumps" because of the road

[timid dove]

Why not BoxCast first then move only as far as the BoxCast allows?

BoxCast isn't appropriate for checking if a particular position is already colliding. You'd use OverlapBox for that. BoxCast doesn't hit objects that the box begins the cast overlapping

I just watched your video

Looks more like a your code problem than a Raycast or BoxCast problem

Again you should really just do the check before you move the object and don't move it if there's an obstacle

[dense kestrel]

so wheel colliders are a joke right?

[minor berry]

that is dope

[gleaming nebula]

hey so Im creating a pirate boating game and Ive created a way to keep the player on the boat while its moving by adding the boat velocity to the players velocity so then it follows along, however the player keep jittering with the velocity added. im not sure how to fix this

[timid dove]

That doesn't make sense. Raycasts hit colliders. There must be colliders for the Raycasts to work.

I'm also just saying Raycast first, move second.

[muted wave]

how can I stop discrete rigidbody from going through rigidbody as when it is going fast it doesn't detect the other wall and the wall has a rigidbody(but I can remove it if you think that might help) and I have to have the discrete rigidbody be discrete as it stops another bug.

[unique cave]

continuous collision detection mode is the way you make objects not tunnel thru each other when they are moving fast. trust me, coding it yourself so discrete colliders can't tunnel through each other is going to be 100x harder than just fixing the original bug and using continuous collision detection...

[muted wave]

ok so I guess I need to fix the bug

again as I thought this was teh way to fix it

[unique cave]

what is the bug?

[muted wave]

The player jumps when moving on the road because the road isn't a perfect flat road and it is also aesh collider

[unique cave]

afaik that's quite heavy process and should be avoid when possible. if you use kinematic rigidbodies on the moving objects and use Rigidbody.position instead of Transform.position, the update on physics engine should be immediate.

I'm not sure. some sources suggest objects with colliders on it shouldn't be moved using transform because it can be expensive (physics engine considers objects without rigidbody a static object that is not meant to move)

those are mostly quite old pages I have been reading so it may not be that expensive these days

[timid dove]

Why wouldn't it work?

But yes you do normally need to wait for the physics update unless you sync transforms manually

[carmine basin]

Is it possible to essentially "pick something up" by sandwiching it between two colliders?

Im thinking of physically articulated hands but im not sure how that'd be in both practicality and performance

ignore last lmao

[graceful oar]

I have 3 doors, eastern (e) , western (w), central (c). (e) + (w) are opened when a game object that corresponds to those doors are destroyed. The (c) door opens upon both the (e) + (w) doors opening. The (e) + (w) doors can only be opened one by one, but doesn't matter which way round. How do I set a boolean so the (c) door will open regardless of if (e) door is opened first followed by (w) door OR (w) door is opened first followed by (e) door?

[brazen echo]

Having a ton of trouble with Raycasts and Trigger

No combination of settings or Query interactions is netting me a Trigger hit

[timid dove]

You're probably focused on the Trigger thing and missing something else.

[graceful oar]

am i in wrong channel again?

[stuck bay]

Hey guys is there a way to use MovePosition with a non kinematic rb or how can I use moveposition without moving through objects?

[timid dove]

What's stopping you from using it with a non kinematic RB?

[stuck bay]

I use it currently with a non kinematic rb problem is that my player goes through the wall currently

[tawdry crown]

Hi, I'm having some issues with collisions:

1. Player is using the character controller and is using charactercontroller.move()
2. Test object does not register any collisions: player and test object have both colliders, rigidbodies and collision matrix is set up
3. Made a test collision script for test object with only OnCollisionEnter (actual OnCollisionEnter script is on player)
4. With the test collision script ON TEST OBJECT, the OnCollsionEnter script ON PLAYER now works as intended (??)

Any idea what's happening here and how to solve the issue?

[timid dove]

does the wall have a collider? Can you show your code?

[timid dove]

OnCollisionEnter is not going to work with a CharacterController. It only works with dynamic Rigidbody.

and if you have a dynamic Rigidbody, that is not compatible with CharacterController

unless you're saying the other object has a dynamic RB?

[tawdry crown]

But why does it work if I just put a test OnCollisionEnter on the test object?

[timid dove]

show what you mean

show the components on both objects when it does and doesn't work

[tawdry crown]

On the player there is a rigidbody, charactercontroller and some custom scripts, one with OnCollisionEnter
On the test cube there is a collider, rigidbody and a test script with only OnCollisionEnter

This way the player registers collisions but if I remove the testcript on the test cube, the player doesn't register any collisions. So it works, but only if the test object has a script with an OnCollisionEnter.

[lilac garden]

same doors, but one inverted, one hinge joint breaks and the other doesn't. Both have colliders inside

[graceful oar]

https://gdl.space/ohutodehek.cpp

I'm trying to get a door to open upon two doors being opened, but the door needs to open regardless of which of the doors are opened first and only after both doors are open

the gate index issue i have is, with each gate unlocked, add 1, so the first two gates should make it 2 right and so for the last gate i did > 2

im sure thats right how ive done that

[timid dove]

you're just doing gateIndex++ every frame (twice) whenever your HP is <= 0

Also your doors are going to fly away into the sunset because you Translate them forever

not sure what you mean by "regardless of which of the doors are opened first" because both of your doors just open at the exact same time

also why do you have so many random unecessary empty scopes... { }

[graceful oar]

i know before one door opened when a target was destroyed and then the same would happen to the other. now they both open which is not what i want and the hp bar no longer works on one of them. what i wanted was open either door a / b in any order and door c would open one both doors are open (regardless of order).

once* both doors

the index i was trying to do so that door a and b equals a number and when the number is higher than a value door c would open

i know ive probably done it all wrong

[timid dove]

What you're describing and the code you've presented don't seem to be in the same galaxy of functionality 😛

I would expect each door to have its own hit points variable for what you described, for example

[surreal elm]

Hey I'm trying to apply gravity to a character that has animations such as idle, walk, etc. The issue I'm running into is that when the game starts, the idle animation is applied, and the character doesn't fall by gravity because of it. Is there any way to fix this?

This is the character's inspector:

[jovial wraith]

I find that the easiest way to get physics and animation to play nice together is to put the physics components (rigidbody/character controller, collider) on the parent and put the rendering components (mesh renderer + animator) on a child. That way the animator can do whatever it wants to the thing being rendered without messing up the physics

however, that probably would not work with root motion

also, you should not have both a character controller and rigidbody on the same object. Use one or the other

[surreal elm]

Alright I'll try that, thanks! Is there a reason why the physics and animation get wonky like this if they're on the same gameobject?

And thanks I'll remove the character controller

[jovial wraith]

because they don't talk to each other and both are fighting to control the same values. Physics says "Oh, the object should be moving left" and animation says "oh, the object should be moving right" and there is no way for them to resolve who wins

by creating a hierarchy of GameObjects, you're telling the two systems how to cooperate

[surreal elm]

ahh alright that makes sense. Thanks again for your help, I appreciate it

[dreamy pollen]

https://learn.unity.com/tutorial/physics-best-practices#5c7f8528edbc2a002053b5b4
This info is profoundly outdated right?

I don't think you need to slap kinematic rigidbodies on everything that moves anymore... isn't this what the "static" checkbox is for?

[stuck bay]

I'm trying to make a pinball game in unity, what scale should I apply to my table? thanks in advance for the tips

[lethal wren]

Scale 1 to my mind
But when you need to scale down an object (like the ball) wich have a collider, put this object in an empty parent, and scale the parent

for object wich have collider etc, the best practice is to let his scale at 1,1,1

[muted wave]

hello so I have a road I made in blender and then I import it to unity and give it a mesh collider I want to know is this the best option as then my player(a sphere collider) bumps into the ground's small changes in height causes it to kinda jump I was told I need to make the ground seemless does that mean I need to change my way to give it a collider?

this is the bug

[lethal wren]

can you show us the collider ?

[muted wave]

it's just a sphere collider but

I was told to maybe make a script in order to keep the sphere collider(player) on the ground but I think I didn't do it well

if (grounded == false && stickToGround)
{
Debug.Log("going down");
rb.position = hitPoint;
rb.position = new Vector3(rb.position.x, hitPoint.y -(0.989f), rb.position.z);
}

esciantially It checks if the player is on the ground if not it tries to bring the sphere collider(rb which is the collider of the player) to the hit point but a bit heigher up so it just touches it

[muted wave]

never mind I was able to fix the problem in the brackeys server thanks to a user called molibloo.

[jovial wraith]

That information looks correct to me. If it moves and interacts with physics, it should have a rigidbody (and the movement should be controlled via the rigidbody, not by moving the transform directly). The part about triggers not working without a rigidbody is definitely true.

That article was updated in Feb, 2021. That's not that old and the Unity physics system has not been totally overhauled since then.

If you don't believe the info is current, it's not that hard to profile the difference yourself. Just make scene with a bunch of interacting objects and try it with rigidbody vs without rigidbody and check the profiler.

[earnest nymph]

so this is what the enemy reptile should look like

but when i hit play he is in the ground

it has a nav mesh agent on it

[dawn plank]

where is the pivot point in play mode?

[timid dove]

where is the pivot point period? Make sure you have tool handle position set to Pivot, not Center.

And... probably yeah your code is just dumping him in the ground

[iron wing]

Hey everyone! Im having a problem considering hinge joints, I don't know why, but they all start flying into the distance when I press play, or touch them.
Here are the components they have, (the 4 wheels share the exact same component, I linked all objects for better reading)

[iron wing]

Problem solved! The constraints of the rigidbodies were causing it!

[earnest nymph]

where do i see the pivot point?

[dawn plank]

the pivot point is where the move Widget has its center (the red green blue arrows)
You can switch over the the scene tab / window while the game is running.

[earnest nymph]

i fixed it by offsetting the agent nav mesh

base

[grand flame]

hello

i am making a mobile fps

i have created the movement,shooting,AI and the map but the problem is i am trying to create a health system

the health system should update everytime the AI shoots me (i am using the Raycast feature for the shooting on the bot)

i found a tutorial but instead of using raycast he made a projectile and used the istantiate function.

can anyone help me make the health system please

[atomic lintel]

is there anything similar to Chaos in Unity that unreal has?
Like you could create objects that shatter and break

Closest i got to it was make a blender model then cell fracture it then add rigidbody, mesh collider and a fixed joint to all the cells then when u shoot it for example the object shatters. But if the fixed joints have no connected body they dont have gravity so the object just like floats in air after you shattered the support. Then if you add a connected body to all the joints it just shatters instantly.

[timid dove]

There's this https://assetstore.unity.com/packages/tools/game-toolkits/rayfire-for-unity-148690

[timid dove]

for your strategy though rather than deal with a million joints etc, I'd just swap out the "intact" object for the "broken" objects when the thing is supposed to shatter

[atomic lintel]

I was planning to make like big complex objects able to be shattered and broken. So if there would be like a tall building you could shatter the bottom and then at some point the building would fall and shatter even more when hitting the ground. I got it working pretty well with unreals chaos system but idk if something like this can be done in unity atleast easily.

[timid dove]

yeah rayfire is made for that

not free though

I have no knowledge of Unreal features so not 100% sure what I'm comparing to

[unique cave]

I think chaos is free built in destruction system. That unity doesn’t have but you can use assets made by others as praetor is suggesting (or build your own system which sounds very complicated)

[rough lodge]

For 2D, how can I handle slopes? I have a circlecollider for the ground, but I slide down slopes

Increasing friction makes me unable to climb them

[lapis plaza]

there are some nvidia blast integrations for unity

@atomic lintel^

pretty sure unreal used to use nvidia blast for their fracturing framework too (to be simulated with chaos)

blast is essentially what is successor of their apex destructions fracturing tools, it's just different concept now

(ue4's destruction was still apex based - unless you went to experimental chaos builds)

[sweet ferry]

Does anyone have any resources that could help me make an active ragdoll? (Unity)

[dreamy quail]

i am working on a rigid body vr hands set up
the tutorial im following says to use primitive colliders
i want to use a mesh collider

will this cause a problem

[dreamy quail]

https://www.youtube.com/watch?v=HF-cp6yW3Iw
would this work

[timid dove]

mesh colliders will be ok for individual pieces of the doll as long as they are convex.

and as long as you aren't expecting them to deform with the mesh

[trail sphinx]

I can't figure out why ragdolls created using the wizard on Mixamo character rigs are getting stretched, ive tried re-doing it like 5 times with 3 different rigs in t-pose:

ive had plenty of success with this in the past but its been a while, not sure what im doing wrong

[graceful oar]

https://gdl.space/akotefowoh.cpp , https://gdl.space/rujuhayoja.cpp,

Hello I'm still having issues of when the two lower gates in the highlighted picture, when they go down (see gameplay video) the upper central gate is supposed to go down as well

both lower gates need to be down but can be moved in either order, just need the central gate to register that

I've tried doing this with a gate index

[timid dove]

this is incredible. Sorry I have nothing helpful to say.

[magic girder]

hi
i made a parachute acctually my friend did and now we dont have the file we only have it on workshop steam we want to download this mod and split some parts like we made 2 parachutes we want to remove one of them can any body help us to split them from each other (just take one and remoe other files)

[graceful oar]

Have you any advice PraetorBlue to my above post?

[abstract cobalt]

Are there any method for making liquid physics. Like pour, shake etc

[timid dove]

https://assetstore.unity.com/packages/tools/physics/obi-fluid-63067

[atomic lintel]

Found this https://github.com/ElasticSea/unity-fracture Works very well even better than unreals in my opinion and needs no setup for the mesh (In response to my previous question)

[turbid geyser]

So I'm having an issue where OnTriggerEnter2D isn't being fired in a certain scenario. I have a Collider2D that I'm toggling enable state on. If the target object is already in the collider's space when the collider has its enabled set to true OnTriggerEnter2D surprisingly does not fire. This only happens if the rigid body has 0 velocity. If the object is moving, then OnTriggerEnter2D will detect the target object.

Is this expected? Or is this a bug?

[timid dove]

it's a known, annoying quirk

[turbid geyser]

@timid dove Roger, thanks.

Is there a common known solution? I feel like the hack would be to switch to stay instead of enter and add logic. We did notice that toggling"IsTrigger" as well solved it.

[bleak umbra]

Basically everything that triggers a physics engine update for the object. A tiny movement. Add/remove a collider, switch to/from kinematic etc. all should work

[sleek creek]

uh super noob question, I assume these red and blue spheres are the joints from the animator or something?

For some reason they sometimes desync/follow a different physics system than my actual model. Any idea why/where to access them?

[rough lodge]

why is this happening? (Blue is perpendicular, Red is normal)

[rough lodge]

nvm, had to change the raycasts from starting in transform.position to groundcollider.bounds

though how do I make it so that it doesn't kinda "fly"/start falling when it's at an angle where it should be able to walk?

[trail sphinx]

Ok im back asking again about ragdoll, it seems like my ragdoll joints are breaking but they have infinity force, screenshot from the frame before and after being enabled

[raw lance]

So I tried adding context to my mesh collider and it didn’t enable collisions

[frigid pier]

"convex" Also make sure it's physics driven and not pulled through by code.

[raw lance]

I didn’t code the physics?

I’m not interacting with physics in any of my code

[timid dove]

then why would there be any collisions

[raw lance]

Because there is two colliders? Do you have to code collisions in 3D?

[timid dove]

You need more than just colliders

you need a dynamic rigidbody

[raw lance]

What do I need?

[timid dove]

and you need the object to not otherwise be moved/positioned by your code or other componnents like animators/CharacterControllers

[raw lance]

Dynamic rigid body I did not know that

[timid dove]

Rigidbody is the thing that the physics engine actually simulates

without it, there is no physical simulation at all

[raw lance]

I have a regular one

[timid dove]

A "regular" Rigidbody is a dynamic Rigidbody

[timid dove]

This part is important too though

[raw lance]

Oh then I have one already

I move it only with the rigid body atm

[timid dove]

how are you moving it

show the code

[raw lance]

Sec I just posted it

Here you go

But it falls through the world long before I try interacting with it

[timid dove]

the code looks ok

You must not have the proper colliders set up

maybe show the inspectors of the two objects you are hoping to collide with one another?

[raw lance]

I just changed from a box collider to mesh collider

[timid dove]

show it

show the inspector of the moving object

[raw lance]

One moment

[timid dove]

and the inspector of the object you want it to collide with

[frigid pier]

setting velocity in Update

[timid dove]

should be fine as far as respecting collisions go

they'll have a problem with setting y velocity to 0 and presumably having gravity enabled

[frigid pier]

You still didn't set mesh collider to convex

[raw lance]

Oh, my bad, i turned it off for testing

it doesnt change the results anyways'

im sure its a stupid mistake but i cant see what im doing wrong

[frigid pier]

Should start with simple configuration to make sure you didn't make any mistake. But what you really should do is to follow Unity Learn course covering physics. I think Essential Pathway covers it as well.

[raw lance]

Oof it was going through the world, it was physics going cracked

ill chat that out

in 2D i didnt really have to worry about this as much

[raw lance]

Oh yeah, forgot to mention, I didn’t set velocity in fixed update cuz I’m a trash monkey

This is my first dive into 3d so a lot of new stuff

[frigid pier]

There's a very good reason to go through well structured courses instead or relying to grab what you need currently from random tutorials or even manual.
You'll be exposed to almost complete set of features, including some that you would encounter only randomly stumbling into.
So you would be able to play with full set of tools. Even if you don't remember how everything works you'll be aware of it and know where to find information about it. And would be much better equipped troubleshooting stuff like this.

[raw lance]

Im going through it right now, thanks

[spark crest]

im working on a vr game and for some reason the hands keep clipping through objects
i tried increasing the physics iterations but it doesnt change anything

the radius of the sphere hands that im using are 0.2

[timid dove]

Possibilities:

• You've made your cube very thin in terms of the y scale. That can lead to tunneling: https://gamedev.stackexchange.com/questions/192400/in-games-physics-engines-what-is-tunneling-also-known-as-the-bullet-through
• Your animator could be phasing your object through the ground

[timid dove]

generally your hands are being controlled by the VR controllers which means they're just teleporting around and ignoring physics.

[raw lance]

Thanks I’ll try 1 thickness going forward

[timid dove]

If you want them to convincingly move other objects around you'll want proxy objects which have kinematic Rigidbodies and follow your VR hands in FixedUpdate using like Rigidbody.MovePosition and Rigidbody.MoveRotation

[old spindle]

Simple problem I can't seem to solve.

I have a physics mat with bounce = 1, bounce combine = max, friction = 0, friction combine = min
I have a ball and paddle with this mat applied
I have walls with colliders but no physics mat

When the ball collides with the wall, it bounces off with no decrease in velocity.
When the ball collides with the paddle, it bounces off, but loses a good amount of velocity.

No scripts doing anything other than spawning the ball and giving it an initial force.

[timid dove]

how are you moving the paddle

[old spindle]

kinematic, but atm it's just standing still

[timid dove]

so when it bounces against the same material it loses energy but with the default material it bounces nicely?

[old spindle]

yeah

[timid dove]

that does seem odd...

[old spindle]

if I remove the mat from the paddle, it still slows down

tried lots of configurations but can't figure it out

[timid dove]

screenshot of the scene?

[old spindle]

sure, sec

[timid dove]

what happens if you remove the Rigidbody from the paddle too? (you said it's not moving currently, right?)

[old spindle]

let me try that before I take a few ss's

ah, does not lose speed when I remove the rb

[timid dove]

interesting

I cannot explain that to you... but at least we seem to have found some kind of pattern

[old spindle]

I added the rb back and now it doesn't slow down... such is life

thanks @timid dove 🙂

[timid dove]

I'm not sure what I've done but you're welcome haha

[tiny cypress]

Hello. Is it possible to do like a Vector3 MoveTowards that takes a vector3 for speed, instead of a float?

I'm adding acceleration to my system, and there's a bit of "snow/icy" slipping to the movement. So I always want to be MoveTowardsing a target, but not necessarily directly towards it every time

I was just adding accel to my velocity, and then adding velocity to my current position, but I end up overshooting the destination

[jovial wraith]

You're trying to do two different things that are in tension with one another

1. Stop perfectly at the exactly place you want to
2. Make gradual changes to your speed, rather than instantly going from one speed to another.

the easiest way to do 1) is to just stop instantly when you arrive at your destination. That's what MoveTowards does

the naive approach to doing 2) that you already tried made you overshoot

in order to do both 1) and 2), you have to predict when you are going to arrive and start slowing down BEFORE you get there, so your velocity gradually approaches 0 as you get closer

that's not a particularly easy problem to solve in a really general way

using something like PID control (https://en.wikipedia.org/wiki/PID_controller) is one way to handle it

though that's probably more complicated than what you're looking for

[tiny cypress]

Thank you Tachyon! I had a nagging feeling that I was trying for something fundamentally impossible, but couldn't tell you why. That crystalizes the issue a lot

And I don't think I need a perfect solution, but that has me thinking. If I can decrease velocity & maybe increase acceleration (so the velocity is more directed towards the destination) then I think it'd be good enough

And holy crap this PID article is amazing, I think this is the answer to something about my car I've wondered about since I was 16

[timid dove]

like - how does cruise control work?

[vast abyss]

hello just wandering if u could make dashes and grappling hooks with character controllers as i think u can only do so with rigid bodys

[wide nebula]

Yes you can

It would require some strong math. It would be easier to do with a rigidbody.

[runic harbor]

Anyone knows how i can rotate the wheelcollider contact point ( the little bubble on the left ) so that it faces down?

nvm solved

i rotated the parent object instead of the object containing the mesh

[fallow harness]

my wheel collider is in the wrong direction. how can i fix that?

[timid dove]

wheel collider always aligns with +z (the forward direction)

it's not the wheel collider that's in the wrong direction, it's your model

[fallow harness]

ah okay thanks!

[fallow harness]

i have the colliders under a separate game object and when i rotate that the colliders wont turn

[timid dove]

they use the Rigidbody's orientation

[fallow harness]

ahhh okay thanks !

[abstract cobalt]

Hello I want to make physical water and I want t add pour effect to it. Can somebody help me (I dont want an asset I need a tutorial, doc. or something else)

[timid dove]

this is like grad school level complex particle simulation stuff

either find an existing asset or start reading SIGGRAPH research papers

[abstract cobalt]

I understand that this is not easy

[timid dove]

Maybe look into marching cubes to start with. That's one way to render "blobby" amorphous kind of objects

[atomic lintel]

so is there no way to make the mesh colliders work properly with rigidbodies. Like if you cut a hole in a cube with blender then import it to unity and add a mesh collider to it, the collider completely ignores the hole in the cube. If you turn convex off in the mesh collider then it works perfectly but then you cant use it with a rigidbody.

Why did they even remove that functionality. I dont want to downgrade to unity 4 :c

Like i simply have a cube with a hole in it. It wouldnt take alot of resources to allow the mesh collider to work properly on it but with convex enabled it just puts like a box collider on it and ignores the hole

[timid dove]

Concave colliders are only supported for kinematic rigidbodies

You can just build a Collider up out of several primitive colliders such as BoxCollider

[slender hedge]

Hey, I was wondering if anyone had an idea why I can't get my ArticulationBody to move using drives. No matter what target I set, nothing is happening. I'm using the SetDriveRotation extension method here (https://gist.github.com/Gustorvo/50fb28e7b348f4a3f74c631891c535bf) and I see it is changing drive values in the editor. This is what my editor looks like...

[jovial wraith]

according to the docs the force formula is:

F = stiffness * (currentPosition - target) - damping * (currentVelocity - targetVelocity)
If your stiffness and damping are both 0 I would expect no force

[slender hedge]

Weird, I thought I tried that and it didn't work, but sure enough... that did it. Thanks!

[atomic solar]

Is there a way to assign different gravity values for different objects in 3d?

I want to change the players gravity dynamically throughout, without changing the gravity of everything in the scene

[jovial wraith]

uncheck Use Gravity for the rigidbody and write a script to apply a custom gravity force to the object

[atomic solar]

oh of course, thank you!

[spark crest]

is there anything i can use other than a mesh collider as collision for a mesh

[swift egret]

if i have a 2d top-down third person game where you can move around as the player character and there are enemies that chase you, should i make them use dynamic or kinematic rigid bodies? i thought the latter made more sense but then i discovered that kinematic objects arent stopped by static objects. should i make even the objects that will never move kinematic to get around this issue?

[bleak umbra]

Ai is usually easier to implement for kinematic movements

You’d handle collisions or rather avoidance thereof, through some form of navmesh and local avoidance

[swift egret]

but does that mean bad hitboxes for the static objects then

[bleak umbra]

Define ‘bad’

[swift egret]

well wonky and something that clearly doesnt fit the sprite

are we talking about a grid based solution

[bleak umbra]

up to you to implement a nicely working navmesh/grid and proper avoidance movement for your game

still simpler than making ai work with forces and random collisions

[swift egret]

i see but how do i implement collisions for the player character

[bleak umbra]

by checking for collisions manually with raycasts

[swift egret]

so like make it cast rays in like four directions or something and see if any ray hits something within the radius of the players hitbox?

can i just make the rigidbodies dynamic and find my own way to deal with the AI problen

i mean the enemies arent meant to be very smart here, theyre like rpg battle initiator triggers

which happen to be monsters of which many arent that smart

in that vein i wanna ask how you can disable ricochet effects because i dont want those in this game

apparently theres a material property named bounciness you can set to 0 though some people online have said that doesnt always work... i guess ill try it anyway though

[stuck bay]

what is the alternative for puppet master ?

[bleak umbra]

built-in ragdoll physics? https://docs.unity3d.com/Manual/ragdoll-physics-section.html

[prime rain]

How exactly do I use the inertia tensor to calculate torque given angular acceleration vector?

[jovial wraith]

https://en.wikipedia.org/wiki/Moment_of_inertia#Inertia_tensor

Use it to calculate the scalar moment of inertia around the axis that you have acceleration (see the Wikipedia link for the equation)

Then use the standard torque formula to find the corresponding torque that would result in that acceleration

[brave geyser]

Can someone tell me plz how to change the motor speed of a slider joint in unity2d in c sharp

[snow leaf]

Help, i added a platform effector 2d but it just doesnt show in the scene

[alpine jolt]

I'm wondering if someone could give me some guidance. I have a number of clickable items in my game and I've noticed that when the frame rate is not as good as it should be they stop working. Is there a way to poll collider interactions more often or at the same rate regardless of what the frame rate is?

[stuck bay]

I have rigidbody 2d components on player and enemy. should I set interpolate option of both of them as Interpolate?

[kindred lion]

how do i fall faster without increasing gravity or mass

cuz when i increase grav and mass my walk becomes too slow

[merry relic]

anyone know how to have this tilemap collider become like straigh

[jovial wraith]

AddForce downward

[jovial wraith]

Are you using the sprite to generate the collider? If so, you can set a custom physics shape for the sprite in the sprite editor (in sprite import settings) that has a simpler shape. It'll use that for the collider

[fading moth]

Is there a way to disable springing in Configurable Joint like in a Hinge Joint?

[elder swift]

Guys, with physicssimulation, how would I go about doing something similar to Physics.Raycast(ray, out hit, 100, m_LayerMask)?

[civic field]

as you can see my hitboxes are fine, but somehow my character hovers over the platform

it falls just right but just stops too early

Any ideas, i'm out personally

[elder swift]

Check the platform collider boundary

[elder swift]

Figured this out, I have to get the physicsScene and call physicsScene.Raycast()

[shut hill]

hey guys how do i fix this bug of the character shaking when colliding with the wall?

[carmine basin]

I've got an active ragdoll setup working, but the fellow is a little shaky and veers off to the side. What methods do people recommend for stability? I'm currently keeping the hips upright using the configurable joints forces, though i may move that to a kinematic configurable joint which pulls the character towards that, then move using that.
Tldr; how to i help stabilise my active ragdoll to prevent veering to one side?

[timid dove]

All objects fall at the same speed regardless of mass. This is a fundamental feature of gravity. Changing mass will not be helpful.

To make something fall faster gravity itself must be increased or you must add an additional downward force on the object.

[carmine basin]

This is also basic physics - it's a good idea to have some knowledge of real world physics because Unity mostly complies with those laws

[timid dove]

Use the physics engine to move your character instead of teleporting around via the Transform.

[carmine basin]

I do love me some physics
your options are as praetor said.
If you want to learn about physics, there's a website available called Physicsandmathstutor, which has loads of stuff in it. its aimed at gcse and a level students but its good for anyone. hope it helps if you choose to check it out ^^

[kindred lion]

i mean. assuming real, not ideal physics, mass affects the counterbalance force (weight) to air resistance allowing denser objects to fall faster

since weight is mg and weight is the force that pulls you down

and air resistance tries to keep you up

you break through air resistance faster with more mass and less surface area

amd increasing gravity but keeping friction/drag constant also means the weight of the object (the effective inertia) is greater so it takes more force to make it walk on the ground

[kindred lion]

i am an a level student 😭😭😭

acceleration due to gravity is always the same but air resistance applies force in the opposite direction

hence a feather falls slower than a brick

i suppose unity doesnt have air resistance ig

[carmine basin]

Unity has linear drag, which is the drag field on rigidbodies

i also found with my character than heavy legs is good for making it walk

I might play with the mass scales, since heavier rigidbodies tend to be more "responsibe" to configurable joint rotation motors

[tardy hatch]

amogus

[civic field]

you can actually see the platform boundary in the first screenshot

i'm still super confused

used Unity for a while never encountered

and my scene is just these two objects

[carmine basin]

Crossover question between Physics and VR but in the case of an active ragdoll for the player, how would one keep the head still and sync it with the head's tracked pose driver?

[vast axle]

Hello, how i line my colliders prefect to fit these peaces under each other? In photshop I made them in same size everywhere.

[timid dove]

If you are making Tetris I highly recommend not using the physics engine.

[merry relic]

for some reason my floor falls whenever i click play

[timid dove]

video not loading for me but you probably attached a Rigidbody component to it and didn't make it kinematic or static

[merry relic]

its not a video but alr ill check that

it worked thanks. And if i want my character to not fall thru the floor would i need to add a collider on both my charachter and the ground?

[twin nebula]

Is there anyway I can make Angular X and YZ drives object space? I want to be able to parent 2 cubes to a bigger cube and say if I twisted the big parent cube they wouldn't try to correct themselves on the Y and Z

I'm not too familiar with the angular drives but honestly anything like that would be good

Ooh wait I just figured it out. My bad!

[twin nebula]

Is there any way I can make this only limit one side? Right now this sets the limit on both sides. I'm trying to make sure the elbow doesn't bend backwards

[carmine basin]

Why is your axis set to 180?

It only needs to be set to 1, having it set higher has no difference

also

Try playing with the primary axis until you have the x axis of the joint is along the bend of the elbow

[elder swift]

Oh I see now, it's the green outline. What other components are on the platform and the object? Any Rigidbody? Maybe boundary issue there?

maybe you've done like I did yesterday and added a second collider not realizing I already had one on an object?

[civic field]

there is a rigidbody on the top one

[pliant fern]

I haven't been able to figure out how to make a realistic inner tube for a water slide, currently I'm just using a sphere collider and locking the inner tube's rotation, but that's not very realistic to how an actual inner tube would behave (as you can see, as it goes on the walls, the rotation doesn't make sense). How would I go about doing this?

I understand why this is happening at the moment, but how would I implement physics that would make it more realistic to an actual tube slide?

I've asked this a few times in the past year but I haven't found any solutions. If there's anything that you want me to clarify I'd be happy to

I've already tried a mesh collider, but with that it got stuck, and multiple primitives didnt work either

I'm thinking some path based system where speeds change? I have no clue where I'd even start with that though and i don't know how i'd implement the tube reacting with the sides of the slide

I think I'm getting kind of close

Making the slide and the tube zero friction seems to help

but it also makes it jump up into the air randomly

like spin out when it shouldnt

[jovial wraith]

Making sure that you have realistic size/mass set for your rigidbody is probably a good start

[pliant fern]

e.g.

[jovial wraith]

tbh, this might actually be realistic behavior for an empty innertube on this kind of slide

it flips over fast, but bumping up and moving chaotically seems reasonable

[pliant fern]

how do you think i could simulate it to be as if a person was on it?

[jovial wraith]

I expect that spending some time trying to set stuff up more like the real situation would help. Start w/ having the innertube be very light but adding another object with much more mass in the center (attached with a stiff spring joint, maybe? Or fixed position joint?)

next level might be actually setting up a ragdoll to act as the person's weight

I'm not 100% confident this approach will solve your issue, but it might

I'm assuming you actually want to simulate it

if you just want it to look good

just making a bezier curve path for it to follow might be easier

🤷‍♂️ or that might be 10x harder

[pliant fern]

idk if that will be reasonable for the game i'm making

Since in it you'll be able to make your own water slides

ok i definitely set that up wrong LOL

[jovial wraith]

this is probably not helpful, but in my undergrad physics classes marbles rolling down curved tracks like this was the classic example of a problem where Lagrangian mechanics is easier to use to solve the problem than Newtonian mechanics (just offering keywords to search if you'd like). Theoretically you could bake a solution to the equations and precalculate the path you'd take down the slide and follow that path instead of doing a realtime simulation of it. But... it'd probably be a pain in the butt

[jovial wraith]

yeah, you'd probably want a really strong spring. Fixed point is probably just better, honestly.

I've never tried to do a simulation like this in Unity, so I'm just guessing as to what's going to work.

[pliant fern]

I don't expect many have tried

considering how specific it is

[jovial wraith]

there's quite a few marble run games. This is pretty similar to that

trickier, but similar

[pliant fern]

fixed joint is kinda working but it gets stuck going up

[jovial wraith]

I wonder if you need some kind of force field pushing it forward to simulate the water flowing down the tube

[pliant fern]

fixed joint seems to weigh it down a lot

I can't find any documentation to put me in the right direction

[pliant fern]

still acts like this, tried adding another object with more mass with joints, increasing mass for the rigidbody, and nothings worked

when it doesn't have the zero friction material it doesnt slide at all

it just rolls a little and stops

[weary moon]

Which object needs to have the OnTriggerEnter() function? can either have it, or does the object with the trigger need to have it

[abstract cobalt]

hi, can i ask a question about a asset inn here

[brave geyser]

Hi, I am making a game based on physics2d..so I want to move player using forces not velocity. but controlling with forces is not smooth. is there proper way to do it

plzz help, I am trying to find a way for months

[frigid pier]

There's nothing inherently "not smooth" with forces. If you want help you need to describe your setup in detail.
There are also tutorials which point out how to to use physics components and when to apply forces properly.

[brave geyser]

Yeah, my player is basically a box and entire world and game depend on all physics. when I use rigidbody2d.velocity to move it, player is moving fine...but when I interact with hanging objects (I have physics ropes and items hanging end of ropes, I use them to cross some places by jump over them) they are not moving independently while player is on them, I think their velocity is affected by player even player is a child under that object. And I got other problems as well. When I use physics forces...all fine but I have to use liner drag to control movements, due to large linear drag its gravity motion or vertical motion also affected. without linear drag some how makes player uncontrol with forces, it move instantly and hard to control. Also stops while after I hold up the key...So I need some physics moment as smooth as velocity moments like in game LIMBO. I think it needs some extra calculations or something right. thank for any help in advanced.. sorry for long expression

[frigid pier]

Parenting does nothing for physics objects, it's just a container in that case.

drag is nice to control maximum speed of physics object, don't use it to stop character though. Instead when direction input is not used multiply Vector3.x of the velocity by a very small number and feed it back in to overriding and arresting momentum. This way it's not completely instant and you have control over it

Also with drag present you would need to add some constant downforce to have character fall more naturally

Physics based controller if a bit fiddly and you need to cover some corner cases, but it handles more naturally than complete override and keeps natural objects interaction.

[brave geyser]

Thanks for the reply. Can you show me some example or a code plz..I actually did not get that vector3.x part properly. I will show you my code

[frigid pier]

I was referring to velocity. Yea it's Vector2 in Rigidbody2D https://docs.unity3d.com/ScriptReference/Rigidbody2D-velocity.html

[frigid pier]

You take the value, multiply to a small number to reduce per physics frame, and then assign it back

X only because you don't want it to affect the jump

It should happen when move controls are not touched

[brave geyser]

do you have a tutorial or something sir

[frigid pier]

This code should be in FixedUpdate as well

[brave geyser]

yeah its in fixedupdate, I call move function from fixed update

[frigid pier]

note to not add button presses checks in fixed update. This input works in FixedUpdate only because it's axis based.

[brave geyser]

Yeah I use inputs from unity inputs. horizontal and vertical

not buttons

I want some thing like, that when I hold or press the arrow key player should move with its high speed (not an accelerating) and when I hold up the key, player should stop instantly

[frigid pier]

It's a simple trick to reduce momentum.

[SerializeField] Rigidbody2D rb;
void YourFixedUpdateRunningMethod(){
  // if your horizontal input is not pressed here run this code
  float smallNumber = .01f;
  rb.velocity = new Vector2(rb.velocity.x *smallNumber , rb.velocity.y);
}

[brave geyser]

ahh, you mean when I dont hold my arrow keys, use this code to stop player from moving. right

[frigid pier]

yes

[brave geyser]

on opposite way

[frigid pier]

not just stop but smoothly force to a halt

[brave geyser]

okay I will try it, thanks,

[brave geyser]

sure

[little flicker]

Heya, I'm trying to get around the "Non-convex MeshCollider with non-kinematic Rigidbody" issue. I've got an airship that i want to apply physics to via a rigidbody (i tried the non rigidbody movement and it was horrendous in VR), the convex mesh collider for it is awful and the overall shape i feel is potentially too complex for a compound collider so I'm having difficulty actually applying the rigidbody in a way that works. Do you know of any other workaround for this?

[timid dove]

You need to build up the collider out of primitives/convex colliders

[little flicker]

my fear of that is that it'll feel weird to interact with the ship in VR unless i go through adding each individual step etc.

idk why but in my head that's too many colliders and counter intuitive ?

[slate copper]

I need some help boys, I'll send a video in a sec

https://streamable.com/b761y2

As you can see what i am first doing that is how it should rotate, Is there anyway i can make so the gun also follows along without it being werid

look the whole video and you'll understand what i mean by werid

[viral ginkgo]

@slate copper You see where it says "center"?

Make it "pivot"

And if that doesn't make the rotations correct, the problem is in the model

[slate copper]

alr let me try 😄

[viral ginkgo]

Btw this won't affect how the transform.rotation, Rotate etc works

They are all from pivot by default

[slate copper]

Thanks man

[viral ginkgo]

np

[spark comet]

Any body know how to make a good car??

[viral ginkgo]

@spark comet A single body car or a proper realistic car?

[spark comet]

More so the driving physics part. I want it to be able to maneuver really well. Currently when I try to do much of a turn it flips or slides too much??? Can’t seem to get a good balance.

[viral ginkgo]

Hmm, I'd try to have a single body and worry about the wheels at all

Then I guess there arent many things that can go wrong

I don't know if you are doing it this way or maybe with wheel colliders

Or something else perhaps

Maybe pushing the vehicle or wheel down will help you achieve better grip

Or maybe you just need to configure the wheel colliders better

Maybe you can copy and paste some values from an existing vehicle that's made with vehicle colliders (if you have vehicle colliders that is)

[spark comet]

Currently I don’t have any cars other then the ones I’ve made if you know or have a good car to learn from that would be very appreciated. Currently I’m using wheel colliders.

[viral ginkgo]

I don't have a car thats good enough to show here, it was an overly complex one

And I don't know of one that might suit you

But if I were to build one as I said, I'd explore the solutions with a single body

I think rocket league also would have single body cars

With a single body vehicle you can configure the static, dynamic frictions

And it'd work more robust

[spark comet]

What’s single body

[viral ginkgo]

Because there's just one body

You just have a zero friction box

[spark comet]

???

[viral ginkgo]

A single rigidbody box and thats your car

[spark comet]

Can you just add forces let me look it up thx

[viral ginkgo]

you can lift it via raycasts from 4 corners if you want

to simulate the suspensions and stuff

There should be assets that does this as it'd be a common use case

[spark comet]

Hhmmm thx for the ideas I’ll do more research

[viral ginkgo]

np have fun

[gentle oxide]

Which character controller should I pick for fast fighting game? Character Controller looks good but has no physics (don't have experience yet to code my own gravity/mass). Rigidbody is nice but has no things like walking on stairs etc.

I mean which one would be better in that case and easier? Is it even possible to tell?

[elder swift]

Sorry with all the delays in response, trying to hash out my own errors that are getting on my nerves. Wish Unity would put out something that just worked with out all the crap weirdness. Rigidbody is good but what about it's boundaries? No duplicate colliders? You mind sharing on github? Or maybe setup a temp project with simlar setup and share on Github? I will take a look

[civic field]

there is everything about the scene here

if you really need the scene i'll share it but I don't think a scene this simple needs it

[neat coral]

it's because of the offset

you objects are wayyyy too small

0.03x0.05

make them proper sized

[carmine basin]

good morning
need help with something - I want to stabilise the head of an active ragdoll character, enough to make it suitable to use for a camera, or to find an alternative

Would I just use the head and hands as normal with the vr controls and follow them with the ragdoll?

[stuck bay]

SUS

[tight topaz]

"Non-convex MeshCollider with non-kinematic Rigidbody is no longer supported since Unity 5."
Hi, I'm trying to make a boat with crest oceans, but on collision, it goes straight through. I can't use a different collider or make it convex, because the buoyancy script relies on it to work.