⚛️┃physics

[bold storm]

hey has anyone dealt with making a ring in unity. I know this sounds trivial but I am struggling to find a good way to add a collider that aligns with the mesh

[tender gulch]

How is it "blowing up"?

[bold storm]

jk im an idiot. mesh colider works fine

[ruby silo]

does anyone know whether there is a meaningful cost difference between using rigidbodies and physics vs using just colliders and moving objects when collisions are registered if all I need is for objects to be able to push one another?

[arctic marsh]

@ruby silo Well on such a little issue, it does not matter. Depends on your situation, if you are like planning a physics game that relies on fun with physics randomness, stay with rigidbodies and unitys physics system, if you need like exact movement, use kinematic and forces

[ruby silo]

Thank you.

[karmic nova]

I have a rb.moveposition movement system, and it works fine, but the player seems to easily clip through everything, even at very low speeds

any help?

Oh and I changed it to velocity based and it was still clipping through

still collided with the ground tho

@ me if you have the answer!

[arctic marsh]

@karmic nova if you use kinematic and use transform.position for example, it will just break the physics and collision detection

[karmic nova]

My objects are not kinematic because of some sort of incompatibility between non convex colliders and them @arctic marsh

[winter sun]

At this point we're looking to commission someone to make a deterministic 3D physics library for our game. DM me if interested or someone who can reverse engineer this: https://github.com/proepkes/UnityLockstep

[jaunty grotto]

Can someone tell me why some of particle are falling through the ground and some stay?

[crude haven]

When i use a friction of 0, but a bounciness of 1, my object makes a perfect bounce upon colliding. However if the angle is quite small, is does not bounce, but moving along the obstacle. Anyone knows what im doing wrong so it bounces even on a 1 degree angle?

[karmic nova]

clipping issue in action

please if anyone has any suggestion this has taken 3 days of attempts and it seems there is no solution on any forums

if you have any suggestion at all pls @ me

[foggy rapids]

depends how you made the collider

if you are going through it could be many things.

• are you inside a mesh collider?
• is your collider thick enough?
• is your detection mode set to discrete or continuous?
• are the layers set to collide in project settings?
• does the wall (if it's not a mesh collider) have a rigidbody?

[half narwhal]

yeah @karmic nova at first glance it looks like your floor seems to be fine, i would say there's something wrong with your wall.

check to make sure it's in a layer that is set to collide with your rigidbody's layer via the collision matrix

i'd also avoid using mesh colliders - mesh colliders have some weird interactions with the main advantage over primitive colliders being detail. such detail is usually not necessary, especially for walls. i'd just set up box colliders for your walls, usually 0.1 or 0.2 thickness does the trick.

also look at the suggestions above

[karmic nova]

@foggy rapids

1. No, already checked that
2. yes, it is not super thin, it follows the mesh
3. Continues Dynamic
4. All boxes checked since I made the game file
5. No it does not

@half narwhal I have the meshes from an asset pack, and that whole front area is all one mesh.

by front area I mean all the walls

[half narwhal]

when you say "yes, it is not super thin, it follows the mesh" do you mean you've set up box colliders instead of using a mesh collider?

[karmic nova]

I meant the mesh collider

ill try box colliders

[foggy rapids]

yeah, collision detection requires solid objects and convex meshes

[karmic nova]

I had to turn off convex bc I would just be inside of it and float

[half narwhal]

in my experience, unless you need very precise collision detection, i would use primitive colliders for everything

capsule collider for the player, box colliders for walls, etc

if all you need is for your player to stay inside the room then box colliders should be just fine

far less expensive and less finnicky than mesh colliders

[karmic nova]

any way to rotate the boc collider?

box*

I would like to get the diagonal sides

[foggy rapids]

if you want to be more precise and you have the model source, you can break it up into a few convex meshes

otherwise, diagonal can just be rotated boxes

[karmic nova]

I tried to do that in blender, but it didn't work out

ah

I wish you could edit box colliders like a regular object

[half narwhal]

create an empty object, attach the box collider to it, then rotate the new object

you can

[karmic nova]

I mean without extra steps

[half narwhal]

you just adjust the transform of the object the box collider is attached to

any rotation or scaling applies to the bounds of the collider too

it's not recommended because if you want to parent any other colliders to that collider so you can move them together, the children will inherit the transformations as well, but really it's not that big of a deal. i usually use a structure like this:

level
L colliders
|  L floor
|  L wall1
|  L wall2
|  L crate1
|  L lamppost1
L mesh

[karmic nova]

oo smart

[half narwhal]

there ya go

for the steps, whether you're using one slanted collider for the entire staircase or multiple box colliders to form each step, just make sure your character is able to climb it

[karmic nova]

I just did slanted

[half narwhal]

yeah, just make sure your character won't slide down that slope

[karmic nova]

I don't like the bumpiness of stairs in those game like minecraft

truw

[stuck bay]

im making a horror game

[karmic nova]

cool

whats it abt?

[half narwhal]

now i have a question of my own for everyone

[karmic nova]

ask away

[stuck bay]

its qbout

about a plane crash

[half narwhal]

put it in a video so you can see the problem

basically having issues with choppy movement when using rigidbody.moveposition

[stuck bay]

man

do u use wasd

to move

becuse i dont know how to script the wasd lol

[karmic nova]

like getting the input?

[half narwhal]

yeah, i do.

thats a question you may wanna ask in #💻┃code-beginner or #🖱️┃input-system though

[stuck bay]

okay

[karmic nova]

private void Movement() {
        fwdDir = tpCam.transform.forward;
        rb.MoveRotation(rb.rotation * Quaternion.Euler(new Vector3(0, Input.GetAxis("Mouse X") * 5f, 0)));
        rb.MovePosition(transform.position + (fwdDir * Input.GetAxis("Vertical") * playerSpeed / 4) + (transform.right * Input.GetAxis("Horizontal") * playerSpeed / 4));
        if (Input.GetKeyDown("space") && isGrounded)
            rb.AddForce(transform.up * jumpHeight * 50);
    }

since you asked here tho, here you go

[half narwhal]

larry, that script has a slight flaw in it

[karmic nova]

?

[half narwhal]

if you move diagonally, you're moving at 1.4x the max speed

[karmic nova]

I didn't even think of that lol

I can just test if two keys are held and cut down playerSpeed

[half narwhal]

nah

what you wanna do is

[karmic nova]

set velocity?

[half narwhal]

make a vector that contains the input direction: Vector3 input = new Vector3(Input.GetAxisRaw("Horizontal"), 0, "Input.GetAxisRaw("Vertical"))

then normalize that

[karmic nova]

mhm

ohh

[half narwhal]

input = input.normalized

then multiply that by your speed

input *= speed * Time.deltaTime

diagonal walking is something that's exploited a lot in speedruns of older games like Doom

i'm not sure if the developers left it in intentionally or not, but it's something to think about

[karmic nova]

my game isn't level based but I still don't want a speed exploit if possible so

it seems like deltaTimne always makes things really slow for me

like

I have to multiply my speed by 100 to make it normal after using it

and I understand why I should use it but

[half narwhal]

you absolutely should be using time.deltatime

because speed is a rate

your code is getting executed every frame, and frame time can vary

[karmic nova]

yeah ik how it works its just annoying

[half narwhal]

so someone who's running your game at 120 fps is going to move 4 times faster than someone running your game at 30fps

[karmic nova]

I just put input in rb.MovePosition, right?

I can't move lol

I am stuck in place and the camera is all jittery

[half narwhal]

instead of GetAxisRaw try GetAxis

i usually use the raw version because it eliminates any smoothing. i just want to know if the key is pressed or not

[karmic nova]

Treid that

still weird

[half narwhal]

alternatively you could check each of your movement keys:

Vector3 input = new Vector3();
if (Input.GetKey(KeyCode.W))
  input.z += 1;
if (Input.GetKey(KeyCode.S))
  input.z += -1;
if (Input.GetKey(KeyCode.D))
  input.x += 1;
if (Input.GetKey(KeyCode.A))
  input.x += -1;

oh wait

im sorry

i forgot MovePosition takes a world coordinate that it tries to move the rigidbody towards

[karmic nova]

is moveposition the best option?

[half narwhal]

do rb.MovePosition(transform.position + input)

[karmic nova]

ah alr

nope

oh I had transform.position

I mean forward

uh

I move backwards when pressing a

the controls are mixed up for some reason lol

oh its moving by world coords

where would I put transform.forward to make player move right @half narwhal ?

I actually am using a cam.transform.forward but still

    private void Movement() {
        Vector3 input = new Vector3();
        if (Input.GetKey(KeyCode.W))
            input.z += 1;
        if (Input.GetKey(KeyCode.S))
            input.z += -1;
        if (Input.GetKey(KeyCode.D))
            input.x += 1;
        if (Input.GetKey(KeyCode.A))
            input.x += -1;
        input *= playerSpeed * Time.deltaTime;

        fwdDir = tpCam.transform.forward;
        rb.MoveRotation(rb.rotation * Quaternion.Euler(new Vector3(0, Input.GetAxis("Mouse X") * 5f, 0)));
        rb.MovePosition(transform.position + input);
        if (Input.GetKeyDown("space") && isGrounded)
            rb.AddForce(transform.up * jumpHeight * 50);
    }

[stuck bay]

Hi everyone

Ive got a third person game but... my character doesn't walk straight when it has to, instead of walking straight he walks diagonal and i found the cause but don't know how to fix. De bug is in the animation. When there isn't an animation on the character he walks straight but if animation is applied he walks diagonal.
Someone know a fix?

[lean holly]

Okay so I am having a problem I am adding spring physics to a car using Raycasting and when all is said and done with my code I go to play the scene and the car just falls to the ground without any suspension physics whatsoever any idea where I am going wrong?

https://pastebin.com/2AipwiYJ

[half narwhal]

transform.forward is the forward direction of the player in world space....in other words, the direction the player is facing

if you want to move the player to the right relative to the direction they're facing, you dont need to use transform.forward, you just do transform.TransformDirection(Vector3.right)

[karmic nova]

I have the direction I need

fwdDir makes it work

I just don't know where to put it

[half narwhal]

im really unsure why exactly you need to use forward direction of the player for anything at all

im still having issues with jittery movement using rigidbody.moveposition and its driving me nuts

switching to kinematic ignores all collisions with the floor/walls/etc AND disables gravity

which defeats the entire purpose of even using a rigidbody to begin with

im reading all sorts of different answers telling me to use different things - ive tried all possible combinations of Update, FixedUpdate, LateUpdate, Time.deltaTime, Time.fixedDeltaTime, rigidbody.velocity, rigidbody.AddForce and rigidbody.MovePosition

nothing is working

is this just an inherent flaw with unity? if so that's kind of silly, i don't know how you can expect anyone to make a quality game if using physics makes your character look like they're in a localized earthquake

[lean holly]

@here

[foggy rapids]

nice try

[foggy rapids]

no, it's difficult to accomplish but a lot of people expect it to be easy.

this article helped me the most: https://www.kinematicsoup.com/news/2016/8/9/rrypp5tkubynjwxhxjzd42s3o034o8

and also be sure to test a release build. The editor has hitches that make it seem jittery (even if it claims to be running at 600fps)

[half narwhal]

sorry, just getting frustrated

[half narwhal]

just gonna build my own movement system

had actually already started on that, but decided to give unity's physics a try

[tender gulch]

I mean, you'll have to rely on unity physics either way. Unless you want to write your own physics simulation. So instead of complaining, share you code and setup and someone might point to the actual cause of the problem.

What I could see from your video is that the only thing jittering is the hair. Try disabling it and see if anything is choppy. If not, you know that it's something about your hair physics/system(not sure what you're using for it).

[obsidian whale]

does anyone else get like insane physics.processing spikes for seemingly no reason
like down to <1 fps from 100+

[tender gulch]

No. Are you sure there's no reason?

How many calls to physics.processing do you see in the profiler?

[obsidian whale]

are calls the individual bars or the instances?

[tender gulch]

Take a screenshot of your profiler.

It's better to see in hierarchical view.

[obsidian whale]

should i get a screenshot during lag?

this is what performance is 95% of the time

[tender gulch]

Okay. Then How did you pinpoint physics.processing?

[obsidian whale]

the orange

[tender gulch]

yeah, so you have 33 calls to it.

means that you get 33 fixed updates in that frame

[obsidian whale]

ok

fixedupdate gets called more during lag right?

[tender gulch]

yes

But it's also related to your fixed time step

Did you change it from default?

[obsidian whale]

let me check quick

it says 0.01

i dont remember changing it but i think the default is 0.02

[tender gulch]

Yeah. Set it back to 0.02. 0.01 would make it update 100 times a sec.

But there was probably something that triggered the drop. If you had 100+fps, it would keep up with the fixed update. Something must've dropped it down below 100 making several fixed updates happen in the same frame and then it snowballed from there.

[obsidian whale]

should i be multiplying values by time.fixeddeltatime in fixedupdate voids?

[tender gulch]

try scrolling back to the left to see where it started going uphill:

[tender gulch]

only if you want your value to be represented in /per second basis.

[obsidian whale]

it couldnt have been the timestep, it still runs good at 0.02 but i get the spikes still

also can i scroll back in profiler?

[tender gulch]

Maybe not. =/ But you could recapture a similar moment and pause right where it happened. This way the beginning of the lag might be captured as well.

[obsidian whale]

ok

i think you are right about it snowballing, i changed the maximum allowed timestep to 0.06 from 0.33 and it still drops but like only to 60 fps

[tender gulch]

Yeah, but something is triggering that snowballing. If you find out what, you might be able to avoid it completely.

[obsidian whale]

right

ill change back the values and see get another screenshot of lag

[tender gulch]

Seems to go quite a long way back.

Perhaps your fps is never high enough to keep it at one fixed update with this time step.

[obsidian whale]

i think it may have been something very stupid

i got these dumb robot drones that hover with raycast, and when they hit themselves on something and got flipped upside down the raycasts would get called every frame and add a force near infinity. putting constraints on them seem to have fixed it

[charred ocean]

Would anyone mind running me through a simplistic explanation of Spherecasts? I keep trying to use them but I'm getting inconsistent and unpredictable results

And when I try to use Debug.DrawLine to visualize it, the line points in a completely different direction than I thought

And other than these two issues, Vector3s have been pretty predictable and straightforward. I'm really stumped on what's going wrong here and idk how to troubleshoot this particular thing

[stuck bay]

You can search on google but if you dont get it somebody needs to help you im busy

[tender gulch]

Provide more info on the issue. Screenshots of the debug ray and your code.

Sphere cast is basically the same as raycast, just with a radius.

Or you can imagine it as a sphere moving through space along a ray.

[charred ocean]

I understand what a spherecast is on a conceptual level, I'm unsure why my code is not working

        {
            grounded = true;
            Debug.DrawLine(transform.position, transform.up, Color.green, 0.01f, false);```

The results are all over the place, it detects objects directly in front of me (not below me, as intended) but if they are too close it just ignores them

[tender gulch]

If the cast starts within or intersecting with a collider, it will not report a collision with it.

That's probably the problem.

[thin gale]

How can i prevent my rigidbody from bumping and rotating when moving in terrain? I have an AI that moves towards me, and ive done some terrain and even tho its quite flat the AI does bump alot.

[charred ocean]

So what about it detecting stuff in front of it instead of under it?

My issue is less with the too-close thing and more with the it's-not-going-where-I-tell-it one

[tender gulch]

That's a different question. Try Drawing a wireframe sphere gizmos at your cast starting position with the cast radius and see if it intersects with any colliders at runtime.

[charred ocean]

Drawing a wireframe sphere gizmos at your cast starting position
How does one do this? Sorry to ask a bunch of simple questions

[tender gulch]

You can use OnDrawGizmos and Gizmos class to draw different gizmos. You can see an example in the docs:
https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnDrawGizmos.html

[tender gulch]

Are you using a navmesh agent?

[thin gale]

No!

Just added it

Must set up some settings i assume?

@tender gulch

[tender gulch]

Then how do you move your ai?

[thin gale]

I'm using a script from Candice AI

[tender gulch]

I mean, how are you moving the character? With rb, transform? Forces, velocity, moveposition, adding a vector to a position?

[thin gale]

The script is using rb.velocity

[tender gulch]

Well, there are plenty of things that could go wrong with that approach. Can you record a video demonstrating the issue?

[thin gale]

Let me see

laggy_movement

@tender gulch

[tender gulch]

turn on gizmos and record again.

[thin gale]

@tender gulch

[tender gulch]

I'm not sure about that Candice AI asset you're using, but you usually don't use dynamic rb with ai. A quick fix would be to freeze the rotation of the rb on all axis aside from Y.

I'm sure they explain a proper way to set it up in readme.pdf that seems to be included with the asset.

There's also a demo scene.

[thin gale]

It works fine in flat grounds

What they cover in the pdf is just to freeze X and Z

[tender gulch]

Well. Did you do that?

[thin gale]

Uhm

Yes

Working ok

Until steeper movement

Let me send you anoter

@tender gulch

I feel like this is a problem regardless of what AI i use, unless they have this in mind

Have you had any similar problem?

[tender gulch]

No. I never used that asset.

But try using a sphere/capsule collider instead of a box.

Also look at the demo scene to see how the have it setup.

[thin gale]

It probably has to do with the rb.velocity

I tried out the other AI option but with same result.

Okay i think it has to do with the object avoidance

I turned it off and it works much better, just minor flinches

So i think the object avoidance is throwing it in those directions

        {
            Vector3 dir = (Target.position - transform.position).normalized;
            RaycastHit hit;
            if (Physics.Raycast(transform.position, transform.forward, out hit, 20))
            {
                if (hit.transform != transform && hit.transform != Target.transform)
                {
                    Debug.DrawLine(transform.position, hit.point, Color.red);
                    dir += hit.normal * 50;
                }
            }

            Vector3 left = transform.position;
            Vector3 right = transform.position;

            left.x -= 2;
            right.x += 2;
            if (Physics.Raycast(left, transform.forward, out hit, 20))
            {
                if (hit.transform != transform && hit.transform != Target.transform)
                {
                    Debug.DrawLine(left, hit.point, Color.red);
                    dir += hit.normal * 50;

                }
            }

            if (Physics.Raycast(right, transform.forward, out hit, 20))
            {
                if (hit.transform != transform && hit.transform != Target.transform)
                {
                    Debug.DrawLine(right, hit.point, Color.red);
                    dir += hit.normal * 50;
                }
            }
            Quaternion rot = Quaternion.LookRotation(dir);
            transform.rotation = Quaternion.Slerp(transform.rotation, rot, Time.deltaTime);
            transform.position += transform.forward * 5 * Time.deltaTime;

        }``` That is the avoidance method

@tender gulch

[tender gulch]

Quite possible. They modify the rotation directly:
transform.rotation = Quaternion.Slerp(transform.rotation, rot, Time.deltaTime);

[thin gale]

Yes,

Is it possible to only rotate it on the Y there

I assume that code changes rot on all axes

[tender gulch]

That obstacle avoidance is pretty messed up.

it raycasts forward/left/right and if it hits something, it multiplies the hit normal by 50 and uses the sum of these 3 vectors as a direction to rotate in.

Honestly, you can scrap it all and just use a navmesh agent with custom code.

Most likely, the tree colliders were causing that weird behavior.

[thin gale]

Custom code to avoid objects?

[tender gulch]

You don't need any additional code to avoid objects with navmesh agent.

[thin gale]

Okay, I'll see what else I can find, otherwise if it's not too complicated I create a script myself

[tender gulch]

Simply set destination and it will move there avoiding obstacles by itself.

I don't even understand why you needed a custom solution when there's already builtin navmesh solution coming with unity...🤔

[thin gale]

Do navmesh agent have that built in?

I did not know

I assume setting destination that my rabbit will get stuck in a tree if it is aligned with the target

[tender gulch]

What would be the point of the navmesh then? xD

[stuck bay]

Any one know how to calculate two Centre of masses together?

eg [Obj 1] COM = X 1 Y 1 Z 1, Mass = 5, + [Obj 2] COM = X 2 Y 4 Z 3 Mass = 10 = ???

[tender gulch]

something like:

(v1*contribution1 + v2*contribution2) / 2, where contribution = mass / totalMass.

🤔

[stuck bay]

Hmm I'll try it out

cus Joints are ass

[tender gulch]

How are joints related?

[stuck bay]

Because, I've got to objects, I need them to stick together and both got different weights, if one is alot heavier it will create wobble between the two parts, what im trying to do is get the mass and CoM from both objects and add as children of a empty game object, and applying a ridget body to the empty game object and changeing its COM and mass

eliminating the wobble

[thin gale]

Thought it had some ground detection purpose

Im not using unity alot so havent used it yet

[tender gulch]

It's a pathfinding system including obstacle avoidance, so it does anything you might need for navigation, as long as it's not movement in 3 dimensions.

[thin gale]

Nice!

[stuck bay]

Hmm seems not to be working

[tender gulch]

Yeah, i think I disregarded the origin point.

[stuck bay]

Yeah, the com is 100% off

And theres litterly 0 things on the internet about adding together com's

[tender gulch]

(v2 - v1) * contibution1 + v1 should probably work.

[stuck bay]

ill try that

[tender gulch]

It's simple vector math. There should be plenty of stuff on that.

Your question is just too specific.

[stuck bay]

Yeah I just didint know how to phrase it correctly i guess

[charred ocean]

OH GOD

I figured out my thing with Spherecasting

I misunderstood the LayerMask

I had it set to the LayerMask I intended to detect but when I switched it back to 0 it worked

So 🤷‍♀️

[half narwhal]

tfw i actually went and wrote my own physics system

[tender gulch]

Well, good luck with that.

[thin gale]

@tender gulch I played around with nav mesh and now i've solved it. It looks really good now! Thanks for your time

[hallow plover]

How do I make 2D game collisions? Like simple walls?

[polar leaf]

You just need to add 2d colliders to the wall objects

[hallow plover]

It's that simple? Like, not even 1 line of code?

Just the box collider 2D for square walls?

[tribal harness]

Yes

[hallow plover]

Cool

[polar leaf]

If your "player" has a rigidbody yes, if it tries to move against the wall it will be stopped

[hallow plover]

Ok

Does it matter what rigidbody?

Because mine just has a RigidBody2D

Also how many pixels by how many pixels is the border of the camera? Just for reference when making my wall sprites

[vital hawk]

Does anyone have solution for arcade style car controller?, i tried using wheel collider but never got what i need

[hallow plover]

How do I set up a box collider 2D? Because atm my player just walks through the walls even though it has a rigidbody2D

[tribal harness]

Maybe you have disabled the box collider 2D

[half narwhal]

how are you moving the player?

[half narwhal]

anyone mind helping me out with my custom physics? trying to achieve an effect where the player slides along a wall when moving into it rather than stopping completely. you can see it working as intended on the straight wall, but the diagonal wall doesn't want to cooperate.

// define ray spacing
float aStepActual = maxRaySpacing / collisionRadius;
int aSteps = Mathf.CeilToInt(Mathf.PI * 2 / aStepActual);
float aStep = Mathf.PI * 2 / aSteps;

int ySteps = Mathf.CeilToInt(collisionHeight / (maxRaySpacing * 2));
float ySpacing = collisionHeight / ySteps;

Vector3[] closestContact = null;
RaycastHit closestHit = new RaycastHit();

// loop
for (int y = 0; y <= ySteps; y++)
{
  for (int a = 0; a < aSteps; a++)
  {
    Vector3 offset = new Vector3(Mathf.Cos(a * aStep), 0, Mathf.Sin(a * aStep)) * collisionRadius;
    Vector3 direction = -offset * 2;
    direction += direction * Vector3.Dot(horizontalVelocity * Time.deltaTime, direction);

    offset += Vector3.up * y * ySpacing;

    Vector3 originOfRay = transform.position + offset;

    RaycastHit hit;
    Physics.Raycast(originOfRay, direction, out hit, direction.magnitude);

    if (hit.collider != null && hit.collider.tag == "obstacle")
    {
      Debug.DrawLine(originOfRay, originOfRay + direction, Color.red);
      closestHit = hit;
      if (closestContact == null || hit.distance < Vector3.Distance(closestContact[0], closestContact[1]))
      {
        closestContact = new Vector3[] { offset, direction.normalized * hit.distance };                  
      }
      else Debug.DrawLine(originOfRay, originOfRay + direction);
    }
}

if (closestContact != null)
{
  Vector3 localHit = closestHit.point - transform.position;
  localHit.y = 0;
  Vector3 deltaToHitPoint = localHit * (collisionRadius * 2 + antiClip - closestHit.distance);
  transform.position -= deltaToHitPoint;

  // scale each component of the velocity vector by the angle between it and the normal of the collision surface (perpendicular collision is scaled to 0)
  velocity.x *= Mathf.Clamp01(Vector3.Angle(new Vector3(velocity.x, 0, 0), -closestHit.normal) / 90);
  velocity.z *= Mathf.Clamp01(Vector3.Angle(new Vector3(0, 0, velocity.z), -closestHit.normal) / 90);
}

i think i need a better implementation of adjusting the velocity in the second snippet where i assign to velocity.x and velocity.z. i was taking a look at dot products last night before i went to bed but i don't know how i would go about implementing it here.

[quartz tartan]

flForce = (transform.right * Mathf.Max(flyLeftRight, 0) * 2.5f) + (transform.up * flyAscendDescend * 2.5f) + (transform.forward * Mathf.Min(-flyForwardBackward, 0) * 2.5f);
frForce = (transform.right * Mathf.Min(flyLeftRight, 0) * 2.5f) + (transform.up * flyAscendDescend * 2.5f) + (transform.forward * Mathf.Min(-flyForwardBackward, 0) * 2.5f);
blForce = (transform.right * Mathf.Max(flyLeftRight, 0) * 2.5f) + (transform.up * flyAscendDescend * 2.5f) + (transform.forward * Mathf.Max(-flyForwardBackward, 0) * 2.5f);
brForce = (transform.right * Mathf.Min(flyLeftRight, 0) * 2.5f) + (transform.up * flyAscendDescend * 2.5f) + (transform.forward * Mathf.Max(-flyForwardBackward, 0) * 2.5f);

this should cause the back props to fire when going forward, the left props to fire when going right, and vice versa, no?
i'm trying to get a drone to fly(albiet clumsily) by applying different forces to the positions of the 4 propellers, however, when i attempt to fly in any direction that isn't up, it turns along with flying
specifically it turns to the right of the direction i want it to fly in, again, along with flying

[sacred cosmos]

How there rest of the code looks like, one that calculates final force from those 4? Or I'm missing something how you set this up in unity?

[quartz tartan]

https://hatebin.com/przdchzvfp for full code

[sacred cosmos]

Ok, what I recommend is to add Debug.Log and print everything, maybe something is configured in wrong way, calculations are wrong. Without actually running your code it's hard to tell what is wrong.

[quartz tartan]

yeah that's fair, hang on while i get that for ya.

ah, i see the problem now. i wasn't using the transform.right or .forward of the props.

[slate lily]

@quartz tartan sorry for ping but iam trying to make my player rotate with the fps camera at X axis another guy suggest something but it didn't work if u can help me pls ping and my fps script is from dani tutorial

[quartz tartan]

Firstly you shouldn’t randomly ping someone

Secondly, I can’t help without knowing what that guy suggested

Also are you sure you followed the tutorial right? @slate lily

[slate lily]

yeah

sorry I saw that u know somethings and u helped other so I thought to ping u

Sorry again

[quartz tartan]

Well, what did they suggest?

[slate lily]

nvm I know now it was a script for pc game iam making android

But thx again

[sour bone]

Guys, I am going insane. For some reason this raycast only hits things that aren't on the Ground layer. Isn't it supposed to work the opposite way and only hit things that ARE on the ground layer?

Seems to work properly with LayerMask.GetMask("Ground"). Huh.

Oh... actually it seems that this mask means that you exclude this layer, so I needed to use ~LayerMask.NameToLayer("Ground") in the first snippet.

[earnest saffron]

how would i make it so a specific type of platform you could jump under it and and above it like the semisolids in mario games

[stuck bay]

are you doing something like this?

what's done here is----
create a line perpendicular to the wall that passes through the current players position
find where the line intersects with the wall
make that intersection the new player position

--

for your situation, given the collision is circular with a radius R
have the line extend out R units, and then set the player position to that

[half narwhal]

thats basically exactly what i was doing before, but it was giving me issues, so im doing a new approach now

actually it wasnt exactly, what i was trying had the blue line in your diagram perpendicular to the green line rather than the red line

[stuck bay]

well you can just use y = mx + b equations for this if you still wanna try this approach

also the issue with having the blue line, perpendicular to the dark green line is that it'll probably glitch out if you run into the wall straight

y = mx + b equation given two points is,
m = (y2 - y1) / (x2 - x1)
b = y2 - x2 * m

to find the slope of the line perpendicular to another line is
m2 = -1 / m1
to find b, you just set y2 and x2 to the player position.

then you can use some algebra to find an intersection of two lines

[ocean raptor]

This paper goes into some detail on the topic of getting sliding right. It's written in kind of an ELI5 way.
Kasper Fauerby - "Improved Collision Detection and Response"
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.162.492&rep=rep1&type=pdf

Somebody later modified it for better floating-point tolerance and slight functional changes.
Jeff Linahan - "Improving the Numerical Robustness of Sphere Swept Collision Detection"
https://arxiv.org/ftp/arxiv/papers/1211/1211.0059.pdf

The basic principle is good, and I believe it was used in the Kinematic Character Controller store asset. That said, I doubt the code in either paper is well-tested. There are probably edge cases neither author thought of.

[stuck bay]

how would i calculate the Centre Of Mass of an object in unity

?

Feel free to tag me

[ocean raptor]

For a center of mass in the physical sense, if you pretend your mesh is a uniformly dense thing, the centroid of its volume will be the center of mass. This is how you can calculate the centroid: https://stackoverflow.com/a/2085502

[stuck bay]

Perfectly what I needed!

Thank you!

I was hopping that unity eould have a built in function but

[dusty verge]

How would I add a force to push a rigidbody player in a direction relative to the player not the world

[ocean raptor]

I think you can just transform a local push direction into world space and then use that in your AddForce. Something like:

Vector3 worldDirection = transform.TransformDirection(localDirection);
// could also do: worldDirection = transform.rotation * localDirection;
rb.AddForce(worldDirection * magnitude);

[dusty verge]

Thank you

[pure mist]

Which would be more expensive. Having a Mesh collider in the shape of a cylinder, or having a gameobject with 8 Sphere colliders arranged in a circle?
I basically want to have a circular "reach" for the player, but not be able to detect items higher or lower than his body height. Does that make sense?

[dusty verge]

I wouldn't worry about writing the most efficient piece of code possible that level of ambition tends to kill off your projects. So long as it works and isn't incredibly costly to your hardware.

[agile girder]

So I've been messing with that default go-kart microgame thingy to get an intro into Unity (never used it before) and I've run into a problem;

I'm just trying to make the wheels on the go-kart bigger, which seems straightforward. I select the wheels, increase scale, boom, big wheel.
Now obviously this doesn't quite work, as the collisions aren't increased as well (collisions are still relative to the smaller wheel and as a result the bigger wheel "sinks" into the floor some). Okay, so I just gotta increase the collider; I increase the sphere collider, the wheel collider, either or, but this is where my problem comes in

If I increase the radius of either of these colliders up to 0.25, all is fine

works great

If I push them to 0.26 or above, it just breaks

The kart will just teleport to a random spot when you try to accellerate

Or, sometimes with other values apparently, just not work. Turning "works" (the front wheels turn side to side) but there's no movement whatsoever

Reduce the radius to 0.25 or below, all works fine

Any suggestions?

[pure mist]

Thanks for that advice. But my project is already deeply developed and soon will be in it's final stages before live testing begins. And I am going through and trying to optimize every little bit as possible to see if I can lower the Minimum Requirements for PC/Mac users. So any insight into my question would be deeply appreciated.

[dusty verge]

ahh alright, I suppose it depends if the player has to face toward an object to pick it up or theres an animation that plays towards the item being picked up then it'd be better to use the circles, if not then the cylinder would most likely take less.

[ocean raptor]

Only profiling can tell you the answer, but a mesh collider vs several primitive colliders probably depends on the number of triangles in the mesh. The more complicated the mesh, the slower it is. The narrow-phase intersection tests against sphere, capsule, and box colliders are dirt cheap.

If you have a really rough mesh cylinder, it probably won't be too bad unless you're colliding with a lot of objects.

[pure mist]

Yeah I have a 10-faced cylinder with total of 12 faces (quads) that I'm going to use.

@ocean raptor thanks for your input.

[zinc heron]

cloth can't collide with other colliders than capsule and sphere ? Because i'd like them to collide 2d colliders ..

[proud nova]

You can't mix 2D physics with 3D physics

[zinc heron]

yea I see ... it's there a way to extrude 2D colliders on the Z axis, so they become 3d colliders ?

[proud nova]

Probably can reconstruct a 3D collider out of a 2D one, but it's not simple as adding a dimension to a 2D collider. 2D and 3D use different physics engines

[zinc heron]

Hm okay, thanks

[hollow cloud]

so im trying to do a soft-body simulation by creating a bunch of sphere colliders and connecting them with spring joints. however, when i run the sim it doesn't keep the shape of the object at all. any ideas on how to make it keep shape or perhaps a better approach to this?

[smoky sail]

Is there a way to make a object slippery or less grippy without Physics Material 2D?

[past zealot]

Hello ! idk if someone can help me but i have a problem, my physics are totally broken but for no reason

everything was working, i've didnt change anything but now my player just go in space for no reason :/

(sorry for my english)

[shell gulch]

Hello. i do not know if its apropriate to ask this in this channel. but bassicaly im having problem adding wheel collider, so im trying to match the collider to be where the car is and i seemingly cant rotate it for some reason. anyone got an idea as to why? https://gyazo.com/2a10f6913cd5b9f042cb73d98c1fea83

[timid dove]

Looks like it's rotating to me? See the euler rotation values in the top right?

Oh you mean the gizmo? I think the direction of the wheel collider is always dependent on the orientation of the rigidbody it's attached to. e.g. https://forum.unity.com/threads/unity-5-wheelcollider-wrong-rotation.349596/#post-2264801

So check the rotation of whichever object in that car hierarchy has the rigidbody

[shell gulch]

everything rotation wise is set to 0

[timid dove]

right, so.. which direction is forward for your car?

If you turn the tool handle rotation to Local

which way is the blue arrow facing?

My guess is off the right or left side of your car

[shell gulch]

Forward is positive X

[timid dove]

Right, forward needs to be positive Z

So you either need to go fix your mesh so forward is positive Z

or make the mesh live in a rotated child object

so that the rigidbody forward aligns with the graphical "forward" of your car.

anyway the wheel collider will always align itself with the Z axis

so that's what you're seeing

The local Z axis of your Rigidbody

[shell gulch]

hmm allright. isnt there a thing in unity like in most 3d softwares where i can just rotate/move it at a certain value then just apply transform/rotation/whatever and that will reset its value to 0 at the point i set it to?

[timid dove]

Probuilder can do that yeah

It's a package you can add to your project - designed for editing 3d meshes right inside Unity

[shell gulch]

allright ill keep that in mind in the future but for now it was faster for me to reimport it but ill try it in a minute

[timid dove]

Yep. Another quick workaround is just to take the Mesh/MeshRenderer/Mesh Collider, put them in their own child object, and rotate that child

And just have an "empty" object as the parent of that with the RIgidbody on it

[median rampart]

does anyone have advice on what the best way to move a 3rd person character is? I'm making an Attack on Titan fan game clone so physics is pretty important to the gameplay which is why I was thinking of using physics for running instead of transform.translate(). Should I just use rigidbody.addForce(... , Impulse) or something along those lines?

[shell gulch]

@timid dove allright looks good for now thanks https://gyazo.com/0435f651b59eb33f1e177c7c2a9e9603

[timid dove]

Awesome glad you got it working!

[timid dove]

You need to decide if you're going to go with physics-based motion or not.

Usually, using physics based motion is not a good idea, as you have less control

I suggest using a CharacterController (which can still interact with physics objects). You get a lot more control

and it updates in the Update loop rather than the physics update, which means you'll have less issues with camera stuttering etc...

But you said physics is important, maybe elaborate on that?

What do you plan to do with physics in your game?

[median rampart]

so if you google "Feng Lee attack on titan fan game" I'm making a clone of that. Essentially the 3rd person character uses 2 grappling hooks to swing around like spiderman

[timid dove]

Hmm I could see how it's tempting to use Rigidbody controls for this.

You could probably get away with either

Honestly the more I look at this though the more it looks like a CharacterController

[median rampart]

ok, i'll throw that together and see how it feels

[timid dove]

Yeah... make some quick prototypes of both

that's the best way to figure out what works best... THe rope stuff might be hard with a CharacterController

whereas if it's physics that's pretty simple to set up with joints

[charred ocean]

If someone's free to answer this question: How do I Spherecast to a LayerMask exclusively? When I add an integer in the Spherecast, it ignores that layer. But when I add a ~ to the integer, it works on layers 3-<int>

Basically, how do I restrict my spherecast to only looking for Obstacles (my Layer 11)

[tender gulch]

Either create a new LayerMask from layer name/ index, or use bit shifting( 1 << 11).@charred ocean

[charred ocean]

Not sure what you mean. Could you explain what that does?

[tender gulch]

@charred ocean Which part exactly?

[charred ocean]

Either of those, creating a new LayerMask from layer name/index or using bit shifting

According to the .NET documentation bit shifting "shifts its left-hand operand left by the number of bits defined by its right-hand operand" but I have no idea what that means in the context of trying to select a specific LayerMask

I was just wondering if you could explain how that would help in a little more detail idk

[tender gulch]

LayerMask is a bitmask. There are 32 bits in an int so you can encode 32 different combination of states in it. 0~01(29 more zeroes in between) for example corresponds to Layer 1 being toggled while others are not toggled.

With bit shift you move that 1(on the left side) x(the right side) times to the left. 1 << x.

You can avoid using bit shifting by using unity api for LayerMask:
https://docs.unity3d.com/ScriptReference/LayerMask.GetMask.html

Then you pass the resulting int(whether from bit shifting or LayerMask) to the raycast as an argument.

Or you could even set it in the inspector by exposing a LayerMask field in the inspector.

[charred ocean]

Hey thanks a whole bunch, that's just the info I wanted

tyvm :)

works perfectly, thanks again :))

[hybrid fractal]

I'm building a 2D game with hundreds of monsters (currently 500), each with a rigidbody + circle collider. This is extremely intensive when many of them are contacting each other!!

I'm not sure how to handle this. They very much need to collide with surfaces at least, since they're supposed to run into walls and destroy them

And the game is not on a grid/tilemap

Any ideas on how I could make this cheaper? 🤔

[tender gulch]

If you don't mind the monsters clipping through each other, you could configure the layer that they're using to not collide with itself.

[fathom geyser]

Hello, tricky question, I have a gameobject with a collider2D and rigidbody2D, if I raycast to that object it is not detected (raycasthit = null) but if I remove the rigidbody from the object the raycast works

I guess I'm missing something with how raycast and rigidbody works?

[tender gulch]

Are you using Physics2d for the raycast?

[fathom geyser]

yes

Physics2D.CircleCast(candidate, objectRadius, Vector2.down, 0.1f);

to be precise

[tender gulch]

Is the rb and collider both on the same object?

[fathom geyser]

yes

[tender gulch]

I'd debug the parameters of the raycast.

Maybe even draw a debug ray.

[fathom geyser]

The problem is that if I remove the rb it works

that's the weird point

[tender gulch]

Share the code.

[fathom geyser]

the only difference is that I removed the rb for the second one (letting the collider of course)

void Update(){ 
    if (Mouse.current.leftButton.wasPressedThisFrame) {
            var candidate = Camera.main.ScreenToWorldPoint(Mouse.current.position.ReadValue());
            var objectRadius = 5f;
            var cc = Physics2D.CircleCast(candidate, objectRadius, Vector2.down, 0.1f);
            Debugging.DrawCircle(candidate, objectRadius, Color.red, 10f); // Draw a debug circle
            if (cc.rigidbody != null || cc.collider != null) {
                Debug.Log("Collided");
            } else {
                Debug.Log("Did not collide");
            }
        }
    }

[tender gulch]

Hmm.

[fathom geyser]

and on the gameobject I have a circle collider with a rb

I know ...

[tender gulch]

What if you start your cast higher, so that it doesn't initially overlap with the collider?

[fathom geyser]

I'll try

[fathom geyser]

ok it was because of autoSyncTransforms

even if my rigidbodies appears to be on the right place, they are not, that's why the cast never hit those

thank you for your help

[glad light]

hi, ive got a script for moving a character in a 3d game for a school project. Ive got an issue where after moving around for 10 or so seconds, the character will just fall on its side

ive added a capsule collider and rigid body components to the player object, Does anyone know how i can fix this ?

[light otter]

I'm trying to make a check that finds which NPC is closer to you then putting an icon above their head, I was thinking using overlap sphere and using the collider[] to make a dictionary with NPC gameobj as key and distanceFromPlayer float as value and getting key w/ lowest value. Does anyone think this is too much? I feel like ontriggerenter/ontriggerexit could work too and be less complicated

[timber olive]

i want to create guns in vr that you can customize the parts of. rn i have it working with fixed joints at runtime buts its VERY wobbly. when creating fixed joints in edit mode i found they were MUCH more stable how i want. is there any alternatives? or a fix to the wobbly fixed joints made at runtime? thanks in advance

[supple sparrow]

Both would work and yeah triggers might be simpler. Dont even need an intermediate dictionnary, you should be able to sort by distance the Collider[]

Scratch that last one, that would need LINQ

Like you said is good

[light otter]

Thanks for the response : I think both ways would require linq

Well I could do a for each check for the lowest value too

Linq would definitely be much shorter though lol

[supple sparrow]

yeah yeah traditional way is good enough 🙂

[tender trellis]

Hey. I am trying a create a Boomerang ability, But i don't want it to chest go an come back directly, instead. i want it to follow a route something like this.

where it always tries to return to the Red point ( even if it moves ) but never actually chase the red point, so if the red moves, it just moves on to the peak point then tries to return to the current point of the red

so i can probably do the chasing part if I can find a way to make the boomerang follow a path such as in the SS

how can i do it? should i create a virtual gravity point for the boomerang object so it goes around it ( green point )

or is there an easier way or any kind of help would be nice, i have been thinking about it for a long time and what i have in mind with be both hard and problematic

[timid dove]

Looks like you want this: https://en.wikipedia.org/wiki/Rose_(mathematics)

I'd do it with pure math, not the physics engine

[empty heath]

hm, having a hard time figuring out how to rotate from a direction to another slowly in 3D

Using FromToRotation but seems to not work well

[timid dove]

Check out the example here: https://docs.unity3d.com/ScriptReference/Quaternion.RotateTowards.html

the key is remember that update runs once every frame, and you want to rotate a little bit every frame

[empty heath]

how to compute the target rotation ?

[timid dove]

No idea, that's up to you.

[empty heath]

I only have a direction

[timid dove]

Oh

then just

Quaternion.LookRotation(myDirection)

assuming your direction is a Vector3

[empty heath]

My direction is a vector3

[timid dove]

then yes, use LookRotation

[empty heath]

So Quaternion.RotateTowards(player.rotation, Quaternion.LookRotation(dir), 1) ?

My player.right direction I want it to slowly rotate to match dir

[timid dove]

for the third parameter you use some number of degrees per second and mul;tiply by Time.deltaTime

[empty heath]

It just rotates forever...

It doesn't stop at my direction

[timid dove]

ifs your direction changing every frame?

How are you calculating it?

if it's based on your player's orientation then it will change as your player rotates

[timid dove]

no idea what currentFace.normal is

[empty heath]

it is the target direction

which doesn't move

in fact player doesn't move either !

[timid dove]

do debug.log(currentFace.normal) and make sure it's not changing every frame

[empty heath]

ok

[timid dove]

Thought you said it was rotating forever?

[empty heath]

yes now it is rotating forever

ok currentface normal is not changing

tested, I was sure about that

it is just a direction

[timid dove]

You sure it's rotating forever and not just taking a long time to reach where it goes?

Using just Time.deltaTime as the third parameter means it will only rotate 1 degree per second

[empty heath]

I use 100 now

and it spins like crazy

I just want it to stop as it reaches it

[timid dove]

that really sounds like the target rotation is changing depending on your player's orientation

jut for testing

[empty heath]

I mean both are immobile

[timid dove]

instead of using currentFace.normal

try plugging a hardcvoded direction in there

[empty heath]

ok

[timid dove]

like Vector3.right

just to test and show that it will rotate and stop there

[empty heath]

hmm it stops but it seems not in the right dir

[timid dove]

right because now it's pointing at some hardcoded direction you gave

the question is to figure out what direction to plug into that function that isn't going to change each frame

[empty heath]

I think I knowww

I'll try

welp seems like the problem is hard to solve maybe I could light you up with a screenshot

[timid dove]

Really just save the normal direction in a variable when you start rotatinig

[empty heath]

it is saved and doesn't move at all

[timid dove]

targetDirection = currentFace.normal

then use targetDirection for the rotation

[empty heath]

the only thing I want is to snap the player(arrow) onto the nearest cube face center

it can only rotate using the 2 axis

like if Im here

I want it to rotate here automatically

arrow is pointing like this initially

I suck at physics but I know there must be something to do !

I guess it could be done manually using trigonometry and calculating the angle in between

[tender trellis]

looks like a promising way to do it. thank you!

[median belfry]

Hello, I'm stuck with a collision detection problem. I'm trying to make some kind of ping pong prototype game in VR, but for some reasons my paddle (or my ball, or both) don't seem to detect collision when I try to throw the ball with the paddle. The ball just goes through it. Both my ball and paddle have rigidbody with continus dynamic collision detection mod. The problem seems to occur only when both the objects are moving, no matter the speed, but if my paddle is static (I don't touch it) the ball can bounce on it without any problem. What am I doing wrong ?

[timid dove]

How are you moving the balls and how are you moving the paddles?

[sterile sage]

Im new to unity and making a simple game as one of my first, right now I have added a force to the ground to make it move towards my player, but the speed the ground moves towards my player gradually increases with time, is there anyway to make the ground move at a fixed speed?

[timid dove]

Just add the force once, or just set the velocity once. Adding force changes the velocity. So if you keep adding force over and over again, the velocity will keep changing.

[shut lance]

Hello. I'm attempting to upgrade my project from Unity 2018.2 to something more up to date. I've tried updating to the last in the 2018 line, and also to the LTS 2019 line. In either case, when I upgrade my project, my wheel colliders no longer seem to work. The objects fall through the surface until their box colliders hit. Is this a known issue? Any ideas where to start in fixing this? I even created a new car object with primitives and was able to get the same results (note, the car object is loaded into the game in Scene 2, Scene 1 is the opening main menu). I cannot figure out what is going on. If I revert by to 2018.2 everything is fine.

[timid dove]

Not sure. Check your physics collision layers etc

[sharp sandal]

Hi, I have a general question. If you are moving a GameObject with Transform.Translate, can you make something follow its movements but that moves with accurate physics? I tried attaching an object to a Transform.Translate-moved object with FixedJoint, but even though the attached object has rigidbodyandboxcollider, it clips through rigidbody Objects with frozen rotation and position constraints.

I also tried using a script that takes the Transform.position and Transform.rotation of the original object and then giving the second object rb.MovePosition to those coords, but still it just clips through constraint-frozen objects.

So, how would you make an object copy of a transform.translate object's movements, but correctly move with Physics? Specifically where the Physics fails is: The movement-copying object will clip right through rigidbody Objects with frozen rotation and position constraints.

[median rampart]

hey can someone here with a better grasp of the physics engine explain this to me? My 3rd person player keeps vibrating like crazy whenever I try to add rotation smoothing

this code works:

        direction.x = Input.GetAxis("Horizontal");
        direction.z = Input.GetAxis("Vertical");

        skeleton.transform.rotation = Quaternion.LookRotation(direction);
        transform.Translate(direction*Time.deltaTime*speed);

but it rotates instantly

when I try something like this:

            float targetAngle = Mathf.Atan2(direction.x, direction.z) * Mathf.Rad2Deg;
            float angle = Mathf.SmoothDampAngle(skeleton.transform.eulerAngles.y, targetAngle, ref turnSmoothVelocity, turnSmoothTime);
            skeleton.transform.rotation = Quaternion.Euler(0f, angle, 0f);

the player only rotates like a fifth of the way and shakes like crazy like something is overriding the rotation

any idea what's happening or how I should test this?

never mind, I figured it out, it was a prefab thing

[viral ginkgo]

@median rampart what was it?

I'd assume you were rotating the body but you had angular velocities building up

Which would cause these vibrations

[fading portal]

Hi, How make that object collision only with some other object?

In 2D Game if its some different.

[supple sparrow]

You could put them on different layers

Or apply a more custom logic on the Collision handler

[fading portal]

Thx, I'm search and find Layer Collision Matrix in Project Settings. It is perfect.

[pure mist]

When using BoxOverlapNonAlloc or any cast NonAlloc I notice that it doesn't clear the assigned array from old hits.
For instance, say I have a size 10 alloc array. And during one frame, it hits 15 objects. It populates the array fully. But on another frame the NonAlloc method returns 3, but reading the array it's still showing 10. Does it simply just replace the FIRST three indexes from the alloc array? I would assume this is the logic, because if it is not, then how the hell would I tell which are current hits and which are old hits?

Or should I simply get in the habit of clearing the array before each NonAlloc check? If so, wouldn't that create more overhead, say if my alloc array was 400?
Please help me understand this. Thank you.

[glacial jolt]

@pure mist the methods should return an int that shows how many colliders were populated that call

[pure mist]

Yes, I'm aware of that. My question is how does it populate the allocArray. If it returns 3, does it mean that the FIRST 3 items of the array are overwritten? Or will it overwrite an existing index of htat collider if it already exists in say index 9?

[glacial jolt]

overwrites starting at index 0

[pure mist]

Perfect! That's all I needed to know. Thanks!

[median rampart]

it was the animator messing things up. i'm still not sure why, but the animations are overriding the rotation I apply in script

if I turn the animator off and let the player T-pose the rotation code works perfectly

[viral ginkgo]

👍

[median rampart]

incidentally, do you know how to turn animation physics off?

unchecking apply root motion didn't seem to work for the rotation

[viral ginkgo]

anination physics?

you shouldnt let animator animate anything you move with code

@median rampart you character rigidbody/capsule collider object should not be animated by animator

[median rampart]

ok, so I shouldn't be rotating the skeleton, I should be rotating it's parent?

its*

[viral ginkgo]

if parent is not animated, rotate the parent

this is what i'd do

CharacterCapsule
Skeleton

thos would be the hierarchy

and then when i wanna rotate, i rotate CharacterCapsule

and skeleton will have animator attached

and no root movement or anything

if you have like IK poles targets and bunch of stuff parented to skeleton and you wanna something like a cinematic animation, thats when you might wanna use root motion

[median rampart]

thanks that worked

[viral ginkgo]

np

[marsh star]

Hi, I've made a few buildings with very simple shapes, I want these buildings to have the same collisions as their shapes, how can I do that?

The ue4 equivalent would be "use complex collision", if that helps anyone

[supple sparrow]

Look "mesh collider"

instead of box/sphere/capsule collider

but only if you have convex shapes

otherwise, make a compound collider based of multiple simple box colliders

@marsh star

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

[supple sparrow]

@stuck bay If you have the time to dig through The Nature Of Code by Daniel Shiffman, it's easily explained and you can get quick results in Unity

https://natureofcode.com/book/

online PDF is free to read

Especially read chapter 1 and 2, and you'll get Newton's Laws implemented efficiently 👍

The guy also have amazing content on Youtube

[supple sparrow]

I think you'll find motivation just by reading these, it's so interesting and give a lot of ideas you can achieve quick and get convincing results.

That's what you need I gess :p

[prime ledge]

How do you assign a physics layer to objects?

got it

[tiny hearth]

Hi. I'm looking for help on why my agent is being able to warp through the walls.

• the player is a simple sprite with RigidBody2D and BoxCollider2D
• the walls are a tile map with TileMapCollider2D and RigidBody2D
• when I play it, does not matter how fast I press the arrow keys, I cannot move through the walls as expected
• when mlagents play it, it easily goes through the walls

My guess is that the mlagents is moving too fast and the physics engine is not keeping up.
I tried:

• changing all bodies to continuous
• changing the simulation mode to update
• changing the velocity and position iterations to 5000

Is there any config I can change to make the physics work in this scenario?

Edit: I changed the collider of the player to circle but did not help.
Edit2: Fixed!!!! I was moving the player through localposition instead of velocity. Big lesson learned.

[charred ocean]

Hello there, I'll routinely run into a bug where a CharacterController's capsule collider will hang on by the very edge unrealistically when it would instead slide down. What's a good way to mitigate that?

Excuse the color palette lol

this is what I'm talking about in case the last screenshot wasn't clear

[wicked phoenix]

Hi, I have an issue with particle system collisions. I'm trying to spawn a decal at the point of collision in the direction the collision's normal is facing. I have a more detailed description and inages here: https://forum.unity.com/threads/particle-system-collision-look-rotation-viewing-vector-is-zero.1044739/

For some reason, the decals aren't appearing as they should and I get an error saying Look Rotation Viewing Vector is Zero. Any ideas?

[light jasper]

is it possible for the yellow body connected in a configurable joint to not shake like seen

like for it to be connected, just not have that kind of influence from the main body?

[supple sparrow]

you should be able to set constraints and "freeze" some axis from the inspector panel

but if you dont want it to shake, what's the point of a joint ? Better use transform hierarchy to parent them together, so when you move one, the other comes with ?

[light jasper]

yeah but the lower one needs to extert force on the uppermost body

[sterile flax]

hey yall
working on a type of space exploration game, adding gravity for planets. Ik how to get it to pull towards planets but is at a constant speed, I want the pull to increase the closer it gets, so how would I get the planets distance in unity?
or distance between two objects ig

might just resort to adding multiple spheres around the planet that increase/decrease force as it leaves enters them

[supple sparrow]

@sterile flax https://docs.unity3d.com/ScriptReference/Vector3.Distance.html

[supple sparrow]

please NO

if you have an equation for attraction, it's just a matter of subtracting 2 transform position to get the distance vector

[sterile flax]

found a way to get the distance

xd

apparently obj.pos gets the vector of the object

big brain time

[gilded blaze]

gravity falls off with the square of the distance to the center

so fGravity = gAtCenter * (1f / (wPosYou - wPosPlanet).sqrMagnitude)

where gAtCenter is a pretty large number, but can be figured out from surface G if you know the radius of the planet

high school really did a number on me when it comes to basic algebra, but I think to figure out gAtCenter from a surface level G value, you'd use: gAtCenter = (1f / planetRadiusSquared) / fGravityAtSurface

(might be the other way around possibly)

[halcyon cipher]

If an object is moving fast enough that it could possibly pass through a collider between frames, will it still trigger an OnTriggerEnter/OnCollisionEnter ?

[timid dove]

Not generally

Rigidbody has options for types of collision detection

the default is discrete

which only checks if it's actually overlapping with other objects during each physics step

you can try continuous collision mode

If that doesn't work, a lot of people do their own raycast-based solution

[distant coyote]

you can also increase substeps

[stuck bay]

When checking for ground, is it the same using CircleCast than RayCast?

[timid dove]

No

if a raycast is analagous to shooting a raygun

a circlecast is like throwing a frisbee

(in a perfectly straight line)

anything the frisbee touches will be seen by the circlecast

[karmic sedge]

hy is this a good place to ask for IK?

animations

[tender gulch]

I get it that it's physics channel, but I'm pretty sure that question is out of unity scope.😅

[fathom geyser]

Help

I'm using Hinge Joints 2D with an angle limit (we can see it on the video) but it is not enforced

and after one or two loop it works

[kind obsidian]

Does anyone know how to calculate the distance travelled when I apply a particular Force (Impulse) to a RigidBody on a single call, knowing its mass and linear drag? I'm trying to understand the relations better.

Guess I'll just test it out and estimate the formula via observation

ok, observed that distance is linearly prop to mass

now for drag

dist roughly proportional to 1/linearDrag (eyeballing it, can't guarantee im right)

[gilded blaze]

that's not an easy thing to calculate perfectly... if you are using the actual drag equation, there's no analytical solution AFAIK

there are modified trajectory equations you can use to calculate the position of a projectile as a function of time

but unless you are using those same equations to model the motion of the object, chances are slim that it will match

not sure how much you can get away with good enough

[kind obsidian]

I don't need an exact formula. I'm using it so i can in my head tweak the force, Mass and Linear drag quicker, e.g. when i have an explosion, i want it to go a certain distance (approx), and i adjust the force applied, mass and/or linear drag of the object to match the distance (estimates calculated in my head), so I can tweak values quicker. Same with a speed of an object given those parameters.

I might try understand it deeper, so I can code my "knockback" force and use physics more cleanly in my game, since what I've learned on Rigidbody2D is from observation/experimentation rather than true knowledge/tutorials

[versed holly]

Hello.
Can anyone help me with this question?

https://answers.unity.com/questions/1809208/how-to-raycast-correctly-on-a-generated-mesh-in-bo.html

[median rampart]

can anyone tell me what is causing the stutter?

i'm using rb.AddForce(new Vector3(0, .5f, 0), ForceMode.Impulse);

[timid dove]

Looks like camera being moved in update and player being moved in FixedUpdate

[fallow mica]

Hey I'm having a collider issue (hope this falls under physics). So basically the ring shape with the arrow pointing at it is not behaving the way it should. Players can just walk throught he wall without any effort at all. I'm using a mesh collider for that.

Making it convex is no option as it will close the hole.

I've read online that adding a bunch of box colliders to imitate the ring shape is a way - but honestly this sounds like a very primitive (pun intended) solution.

I'm sure unity is better than that, right?

[median rampart]

that sounds plausible, but I only have 4 scripts and all of them use Update

[timid dove]

is your playrer using a Rigidbody?

[median rampart]

yes

[timid dove]

turn on interpolation for the rigidbody

or move your camera code to FixedUpdate

[median rampart]

good catch, my camera needed to be in FixedUpdate

[viral ginkgo]

@median rampart that will fix the problem, but you wont have 60fps synced smooth camera

you should keep camera in update, make it follow characters transform
and characters rigidbody interpolation should be enabled

[median rampart]

ok, i changed it to that

[stuck bay]

Hello everybody! I'm having some troubles with the physics of unity and I was hoping you could help me out, basically, i'm making a crash test game, where the character is an active ragdoll, he is driving a vehicle, which can be deformed, the deformation act on the colliders of the vehicle, my issue is that the character doesn't handle high collision velocity well, my guess is that he strecthes because of the blunt force caused by the crash and its joints go through the vehicles, causing a "ragdoll strecth", so far I've tried pretty much every Physics set up in the physics tab of unity, but nothing seems to fix it, here is a video of the issue I encounter :

https://www.udrop.com/hq30/PolyContractKiller_-_AnimTestScene_-_Android_-_Unity_2019.3.0f6_Personal__DX11__2021-01-28_20-37-33.mp4

I hope I'm not cutting a thread here, if that's the case I'll wait and remove my message to post it later.

@fallow mica What method do you use to move you player? if your player has a rigidbody make sure to use Rigidbody.MovePosition, it will make your character take physics and collisions in account

also make sure that your player doesn't move too fast, or that you change your Physics.DefaultSolverIterations to a higher value

[median rampart]

my player keeps swinging through the floor when he gets going fast enough

is there a way to prevent this?

[stuck bay]

have you tried my answer to Sei?

[median rampart]

?

[stuck bay]

"What method do you use to move you player? if your player has a rigidbody make sure to use Rigidbody.MovePosition, it will make your character take physics and collisions in account"

I don't know How to quote on discord

[distant coyote]

Aaaaand this thing is useful again! 😄

[median rampart]

you can't use addforce?

[distant coyote]

@median rampart put your rigidbody into Interpolate mode

and make sure you're following the transform.position, not the rigidbody.position

[timid dove]

Play with the collision detection mode too

discrete is more likely to go through objects than other modes (but is also cheapest)

[median rampart]

oh i see

[stuck bay]

"my player keeps swinging through the floor when he gets going fast enough" you mean that when your player encounter a wall or another obstacle it goes through right?

or am I getting this wrong?

[median rampart]

idk because my other obstacles are thick cubes and the floor is a plane, but switching to continuous fixed it

btw, I have a 3d model with a bunch of meshes, how can I put mesh colliders on them? every time I add a mesh collider it says the mesh is none

and then when I manually add the mesh, it's acting like it's not there

my grappling hook raycast doesn't hit it, and my player doesn't collide with it

[stuck bay]

isn't it better to use compound colliders?

[timid dove]

If you can get away with it, usually

[stuck bay]

and for your raycast, show your code

unless he needs high accuracy collision detection (which compound colliders can provide btw) this is a good compromise, that's what I used for my car

[distant coyote]

also nothign wrong w/ using a Box collider for a plane

just make it thicker than 0

[stuck bay]

yep

[median rampart]

        Ray ray = camera.ScreenPointToRay(reticle.transform.position);
        if (Physics.Raycast(ray, out hit, 1000, grappleable_surface))
        {```

[stuck bay]

the thicker it is, the lesser it will have a chance to let objects go through it

[median rampart]

I have set every part of the 3d model to grappleable_surface

[stuck bay]

can I ask you why do you make a ray going from your screen to the "reticle" gameObject? and what is the "grappleable_surface" variable? is it a layerMask?

actually even better, what are you trying to accomplish?

[median rampart]

yeah it is a layermask

I'm not sure how well this shows it

but I'm making an attack on titan game

[stuck bay]

soo, it is working?

[median rampart]

and I've got the grapple hook working

but if you notice there are titans over to the right

that I want to grapple to

and I got it working before by adding a mesh collider and setting the layermask to grappleable_surface

but now when I add mesh colliders it's like they're not there

my player neither grapples to nor collides with them

[stuck bay]

use compound colliders, you could easily achieve that with the feature "ragdoll wizard" provided by unity, and make sure your titan layer is included in your grappeable layer mask

[median rampart]

all i see is the option to add "composite colliders"

not compound

[stuck bay]

IIRC the ragdoll wizard adds the joints and rigidbody for you, make sure to delete those, as I imagine your titan is an animated character

???

please google "compound colliders unity"

I'll spare you the research, a compound collider is just a group of colliders, to make your object collide accordingly to the environment, I'll show you an example

My car for example, use a groups of box colliders to make the physic more accurate, without having to use a convex collider, you can do the same with capsule collider for your titan

Actually this might be a better example for you

[median rampart]

so you had to manually add all those box colliders

and position them just right

[stuck bay]

as you can see, I'm using capsule colliders foreach rigged limbs

yep

[median rampart]

oh yeah they're capsule colliders

ok but why can't you just use mesh colliders?

[stuck bay]

too much cost, and I think unity doesn't allow raycasts to interact with those for that reason

but I might be wrong on that

[distant coyote]

raycast does hit mesh colliders, but they aren't double-sided

so if it isn't Convex, you're gonna have a bad time

[stuck bay]

ah, thanks, I didn't recall

[distant coyote]

similarly, Concave rigidbodies dont work well (historically, and I think unity just disallows them)

Concave Colliders are fine, just not RB

[stuck bay]

but I don't think convex is what he is looking for, since I guess his character is animated

and it will look like a flying squirrel

[distant coyote]

on cocaine

[stuck bay]

yeah

also I don't think it will update the collider according to the animated character movements, too much costs

[median rampart]

ok, but how do I know that my capsule colliders are going to be correctly positioned? if I position them right for T-pose and then my chracter animates, can I be sure they'll be exact?

[stuck bay]

you have to add those colliders to each rigged sections

wait I'll show you

[median rampart]

but if I'm off even a little bit, can't the animation multiply that?

[stuck bay]

here my "UpLeg.L" only has a caps collider

here my "LowerLeg.L" only has one caps collider

and so one

" can't the animation multiply that?" what.

[median rampart]

I'm just asking, "how do I know that my colliders match my joints"

so that when the joints move the colliders aren't off by a little bit

[stuck bay]

when your animation will play, the colliders will move with the animation

[median rampart]

well sure, but how do I know that the top and bottom of the capsule line up with the top and bottom of the joint

[stuck bay]

by using the correct dimensions...?

I'm not sure I get what you are saying

unless your animations also modify the scale, and even then I think the collide is updated automatically

[median rampart]

this is the best I can do for one joint

every time I position it

then change the camera angle

it's off in a different direction

are you certain there's no automatic way to do this?

like in maya perhaps?

[stuck bay]

you see the little cubes on the edges of the capsule? move them until you get the correct dimensions

[median rampart]

i did

in 2D it would be easy, cause I can see all the dimensions at once

but in 3D I don't know how to get it to line up

[stuck bay]

then why don't you do that

you can tweak your view to 2D/3D

[median rampart]

that's not a bad idea

[median rampart]

althought this would be a lot easier if I could see where the joints were

is there any way to turn that on?

[stuck bay]

what do you mean?

[median rampart]

right now it just shows me the axis arrows

I want to see like the view you see in maya with all of the joints as balls

[stuck bay]

is the anchor what you are talking about?

[median rampart]

maybe?

[stuck bay]

english isn't my native language so I think you are refering to the position where your joint pivot?

[median rampart]

yes

[stuck bay]

ah yes my bad you don't use physics in your model am I right?

if your model is rigged correctly the joint should bend the same way a usual human body bends

[median rampart]

but I have to attach the right colliders to the right joints

[stuck bay]

and you can always rotate the joints manually and then Ctrl + Z to go back to its T-Pose

[median rampart]

and the axis arrows aren't accurately showing me which joint it is

[outer bone]

Hya. Im having a problem with a Mesh Collider. I got a ball rolling down a track (track is all mesh colliders, ball is sphere collider). I have a moving object also with a mesh collider. The mesh collider is not working 100% of the times

[median rampart]

so for example, I just put the lower leg collider on the hip joint

[outer bone]

Ball is going very slow, and a Cube collider does work, so does a Mesh collider with convex enabled

[stuck bay]

@outer bone I'm coming back at you, just a second

[outer bone]

No difference in discrete or continous btw

Thanks @stuck bay 🙂

[stuck bay]

@median rampart try to bend your model after each collider editing and Ctrl+ z to make sure it goes back in T Pose, repeat until you are satisfied with your collider

[median rampart]

ok

[stuck bay]

@outer bone " The mesh collider is not working 100% of the times" could you expand? I'm not sure I get the issue

[outer bone]

Passing through just after rolling happens Sometimes

Not getting smacked to the side happens always

[stuck bay]

by any chance are you using an animation to move your object?

[outer bone]

Yeah

[stuck bay]

well you see, animations are transform based position altering, it won't interact with physics

everything that directly modify the transform of an object is suceptible to let rigidbodies go through it

I suggest you create a script that uses Rigidbody.MovePosition for your needs

[outer bone]

The obstacles are not rigidbodies though

[stuck bay]

not only will it work,but you could later on create a public Vector3 that changes the movement axis

[outer bone]

I just threw that on there to see if it makes a diference (which it didnt)

I also have a bunch of other scenes where I follow the same workfow

As soon as I use a Mesh Collider it s eems to go off the rails

Box and Cylinder etc all seem to work

[stuck bay]

ok can you add a rigidbody to it and make it kinematic? just to see the difference

what I just wrote is not a good practice tho, just so you know

and finally, do you really need a mesh collider? what about compound colliders?

[outer bone]

Same behaviour as in the vid, ball stops when hitting it first time, but the obstacle moves through it afterwards

Well, I was planning on making moving track parts / etc. To puzzle those together from compound colliders seems almost impossible

[stuck bay]

why?

[outer bone]

The tracks are complex shapes

Curved etc

[stuck bay]

the obstacle you showcased seems pretty suitable to me

ah

it will be hard then, because as I mentionned earlier, your rigidbody will always move throught the obstacle if the obstacle uses transforms as a locomotion, and if you want your mesh collider to interact with physics by addind a Rigidbody to it, you'll need it to be convex, which again, for curves for example, wont be a good way, since it "fills" the gaps

you really couldn't do something roughly like that ?

[outer bone]

Hmmmm Maybe

[stuck bay]

it really seems like the best option to me

[outer bone]

Yeah prob the only one

[stuck bay]

well that's what a compound collider is

[outer bone]

But it does mean i wouldnt be able to build what I wanted.. Time and all

it will be hard then, because as I mentionned earlier, your rigidbody will always move throught the obstacle if the obstacle uses transforms as a locomotion,

I dont 100% understand this

That's Only the case for Mesh colliders, right?

I dont seem to be able to find anything on that in the manual

[stuck bay]

when you directly update the transform of a gameObject, it's like you forced it to teleport an inche everyframe

[distant coyote]

hol' up a bit heh. whats the goal here? Marble Track?

[outer bone]

Yeah sort of AngryArugula

[stuck bay]

that's why it goes through rigidbodies

I mean that's why rigidbodies go through it

[outer bone]

But, why does that not happen with compound or convex colliders?

[stuck bay]

because you can add a rigidbody to it

forcing it to calculate collisions

try it yourself, add a rigidbody to a mesh collider (not a convex one) a pop up will tell you you have to make it convex

[outer bone]

yeah ok, that makes sense: 2 rigidbodies would be moving physical objects. But, the compound colliders work also if there Isnt a rigidboy attached to it

so in that case there's only 1: the ball

[stuck bay]

rigidbodies ARE physical objects, they interact with physics

[distant coyote]

Kay, so this is a Concave Mesh Collider, with 3 SphereCollider-RB's

[outer bone]

I know Adri2, im saying that a compound without a rigidbody, hitting the ball With a rigidbody, has the desired outcome: Ball moves

[stuck bay]

a compound collider will be more likely to let rigidbodies go throught if it doesnt have a rigidobody and if it is moving

[distant coyote]

if you're MOVING a Collider, it should have a Rigidbody.

period.

even if its Kinematic

[stuck bay]

yes

but since it's a none convex collider it can't be move using physics

also how the hell do you have concave colliders?

[distant coyote]

dont check Convex 😛

[outer bone]

Yeah i was looking at that pic lol

[distant coyote]

its just a half-sphere flipped inside out

[stuck bay]

yeah but then if you move it the balls go through it

that's his isuue

issue*

[outer bone]

Main issue is: I have some complexer moving objects that should be moving the marbles

And im starting to think that it's just not possible

[stuck bay]

yep that's what I thought

[outer bone]

unless I piece together very imprecise compound colliders, which ultimately would take way too much time to be a viable workflow im afraid

[stuck bay]

so you definetly don't want to use a non convex mesh collider

[outer bone]

Thing is the object of the video is Hollow at the top. It should be able to Catch balls if that makes sense

[stuck bay]

ugh

interesting

I might be wrong then!

[stuck bay]

Angry do me a solid, can you move the bowl up and down?

with hight velocity?

[outer bone]

@distant coyote so that bowl is just a inverse half sphere with a mesh collider??

[distant coyote]

@stuck bay with the Transform/Position scene view widget or correctly? 😛

[stuck bay]

as you wish

[distant coyote]

@outer bone if you want to move it around, put a Rigidbody on it in Kinematic mode, but yes thats what it is

[stuck bay]

but my guess is that the balls will go through it

[distant coyote]

well yea if you jerk its transform around

penetration is penetration

[stuck bay]

yeah well that's my issue

[distant coyote]

hh...heh.hehh.

[stuck bay]

take a look up and you'll see my ragdoll doesn't behave properly when a high collision occurs, maybe you could help me on this one?

[outer bone]

im running a test now, lets see

[stuck bay]

"penetration is penetration" lel, I think it can be solved with Default Contact offset tho

in the Physics tab

[distant coyote]

nah you just need to not fuck around w/ order of operations lol

here

[outer bone]

My test it gets the same results as @distant coyote s video

[stuck bay]

wait what do you mean

[outer bone]

But, when moving a little bit faster, it does slide through the objects

[distant coyote]

yea, wel, the Concave Mesh is paper-thin, so your penetration distance and substep count is really important

also flat out floating point resolution too

[stuck bay]

"penetration is penetration" lel, I think it can be solved with Default Contact offset tho

[distant coyote]

public class PhysicsFollow : MonoBehaviour
{
    public Transform target;
    Rigidbody rb;

    private void Awake()
    {
        rb = GetComponent<Rigidbody>();
    }

    private void FixedUpdate()
    {
        rb.MovePosition(target.position);
        rb.MoveRotation(target.rotation);
    }
}```

but alsow hen you move a Kinematic RB, do it right

[stuck bay]

is that code directed to me?

[distant coyote]

whoever

[stuck bay]

"nah you just need to not fuck around w/ order of operations lol" and was that refered to me too?

[outer bone]

Default Contact Offset is really low already, had to to avoid Ghost collisions

[distant coyote]

also whoever lol

TL;DR you can't just set a Rigidbody's position with rb.position or transform.position

or have components like Animator do it incorrectly too

[outer bone]

Yeah ok, so your saying also move those objects in a normal Physics way, not with an animation etc

[distant coyote]

you can use Animator

just do it right 🙂

[outer bone]

what would be the right way? I just have 2 keyframes moving it from left to right

[outer bone]

GRRRrrr Thanks! trying it now 😮

[distant coyote]

i also suggest lowering your FixedTimeStep

always

like 0.01 at least

most "Human perceptable physics issues" wont hapen at that step size

[stuck bay]

except for Adrien

[outer bone]

yeah already got it even at 0.009. And have a custom script for the high speed impacts (since the ball has to be discrete to avoid ghost collisions)

[stuck bay]

my physics timestep is already low, so that doesn't cut it

[distant coyote]

@stuck bay link me ur issue again

[stuck bay]

here : https://www.udrop.com/hq30/PolyContractKiller_-_AnimTestScene_-_Android_-_Unity_2019.3.0f6_Personal__DX11__2021-01-28_20-37-33.mp4

and here

Hello everybody! I'm having some troubles with the physics of unity and I was hoping you could help me out, basically, i'm making a crash test game, where the character is an active ragdoll, he is driving a vehicle, which can be deformed, the deformation act on the colliders of the vehicle, my issue is that the character doesn't handle high collision velocity well, my guess is that he strecthes because of the blunt force caused by the crash and its joints go through the vehicles, causing a "ragdoll strecth", so far I've tried pretty much every Physics set up in the physics tab of unity, but nothing seems to fix it, here is a video of the issue I encounter :

I just think that the physics doesn't have time to process, because interestingly enough, with my slow motion addon, it works perfectly (basically just tweaking fixed time step and delta time)

[outer bone]

@distant coyote with AnimatePhysics enabled the ball just clips through it

[distant coyote]

@outer bone how big...is y...i can't do it.

what radius is your sphere?

[stuck bay]

bruh

😆

[outer bone]

0.2159 😄

[distant coyote]

BallController.cs might as well be named Wife.cs sometimes too for that matter.

[stuck bay]

pfffff lmao

I chuckled with my nostrils

[distant coyote]

0.2159 isn't so bad; but basically if your velocity is over a certain threshold, you might need to scale everything up

ie: with a step time of 0.01f, if your 0.2m radius ball is moving at a certain velocity, you might skip right thru the skin/penetration distance

[stuck bay]

@outer bone try highering the Default Solver iteration in the Physics tab too

[distant coyote]

its a balancing act

[outer bone]

yeah, also with the fixed timestep etc, i do get that

[outer bone]

I had it 'balanced' so far, or at least I thought

[stuck bay]

taht might help you, basically it's the number of iteration to process the collisions

[distant coyote]

crank it to like 30 substeps

[stuck bay]

same for Default Velocity iterations

well a little less

[distant coyote]

meh that one dont matter as much

[stuck bay]

it did for me

[outer bone]

Ooooh 30 seemed to do the trick

[distant coyote]

k, then dial it back till it breaks

[stuck bay]

I add a severe case of car awhole becaise of it

[distant coyote]

half the distance to the goal, etc

[outer bone]

I had it on 12, and even with Animate Physisc it still passed through Sometimes

And the offset? I had that very low due to ghost collisions

[distant coyote]

shrug all a balancing act. depends on your needs

"Dont do too many solver iterations, thats bad!" - if anyone tells you that you tell them they aren't your mom

[outer bone]

AWWwww yissss. Meshcolliders Non Convexed working

lol yeah thats Exactly what I heard. I thought 12 was already pushing it

[stuck bay]

yep, you want to doe as less iterations as possible but still have it work on worse case scenario

[distant coyote]

30 is really bad if you have... 800 balls

[stuck bay]

I don't think he'll have move the 1 ball

and if 800 becomes your standard you can use ECS

[distant coyote]

30 is also really bad if you need your app to run on the ambient electricity of a potato.

[stuck bay]

but waaay less possibility

because it's still in development

ah ah

[outer bone]

22 seems to be the sweet spot

Thanks! At the Very least this will save me so much dev time (just slep a mesh collider on there)

[stuck bay]

you welcome

[distant coyote]

slaps trunk of car you can fit so many solver iterations in this baby.

[outer bone]

even if i wanted to scale that down, which i prob wont, I would then only have to puzzle a compound collider construction together for final builds

Yesssssss. Been bugging me For Hours this

[distant coyote]

make sure you hit Build and it still works 😛

[stuck bay]

yeah good luck!

I don't see why it wouldnt?

[outer bone]

@distant coyote Dont you start making me anxious now 😄

[distant coyote]

@stuck bay (I don't assume gender or buildtarget)

[stuck bay]

leeeeeeeeeeeel

[outer bone]

Yeah PC, Steam only (for the forseeable future)

Also max 6 to 8 balls, not 100% sure yet