⚛️┃physics

[vale dragon]

Having an issue with a collision's relativeVelocity returning a wrong value if one of the objects involved in the collision is connected to another object with a fixed joint? Here's what's happening:

Here you can see with 1 object, the relative velocity (in the first Debug.Log message) is returning a value that's very close to the speedLastFrame value (second Debug.Log message). That variable is being updated every FixedUpdate cycle in my code

But when it's two objects connected with a joint, the relative velocity is significantly lower. In fact, before, it would sometimes register nearly ZERO. I found that attaching a physics material to the walls seems to have stopped it from being that far off, but it's still wrong? Not sure what's up here, could it have to do with the walls being set to static rigidbodies?

You can ignore the 'my speed at moment of collision' part. I know that rigidbodies tend to report their velocity wrong at point of impact. I'm comparing the relative velocity (aka Collision.relativeVelocity) to the SpeedLastFrame value.

[vale dragon]

**Okay... so I "fixed" it by turning off Enable Collisions, now it's showing values you'd expect. **

Why would that fix it, though? Is there some glitchy thing with the two obstacles hitting each other maybe?

[plucky tinsel]

I am making a first person game I have attached a physics material to the player to stop getting stuck on walls which fixed the problem getting stuck on walls but now when moving around the player slides how can I fix this?

[stuck bay]

Yeah but I can make collisions through script as well right? ... Since I'm already simulating gravity and rope physics through script, I can add collision detection and reaction through scripts too right?

[timid dove]

you don't "make collisions through your script". The collisions happen in the game world. Your script can react to them

That's what OnCollisionEnter is for

[stuck bay]

I'm not making collisions, I'm creating detection for the collisions through scripts

So if the rope segment is too close to the ground collider I will reset it's position to where it isn't colliding with the ground

Using raycast

[timid dove]

Yes Unity allows you to react to collisions in your scripts

[stuck bay]

Ok cool..let me explain a bit more what I'm trying to say

1 sec

I'm uploading a recording of what I made

the green lines are raycasts which i will use to check for collisions..(if ray hit too close to ray origin then resolve rope segment accordingly)

is this a solid method or does it need some tweaking?

[timid dove]

Do the segments of the rope not have colliders?

Why not just give them colliders and let the physics engine handle collisions for you?

[stuck bay]

no they dont

[stuck bay]

if i give them colliders then i will have to resort to the blocky version of rope

i will try that if this doesnt work

but this way will be visually more accurate

[stuck bay]

i remember u said something abt bezier curves so it wont be blocky looking

[coral mango]

Visuals don't need to match the physics representation.

[shadow rock]

I'm intending to make a flight simulator in Unity, I kinda know already how to build the physics but I'm having issues with the colliders, I can't make myself into the airplane without tresspassing it or getting ejected from it, do anyone have tips or videos to help with that?

[timid dove]

You'll have to be more specific about what your issue is. Generally for such a thing if you have some kind of player that is walking around you would pretty much completely disable or destroy the player when you enter the vehicle

so collisions wouldn't be a problem

[shadow rock]

Ohh sorry for not being specific..

I mean, the whole game will be inside the cockpit

but i want the player to be able to "walk" inside the cabin just like Microsoft Flight Simulator

but I can't get the collisions to work

[timid dove]

I've never heard of such a thing in microsoft flight simulator lol

but the best way to do that is to use a separate physics scene

with dummy objects

[shadow rock]

holding alt, with the arrows, you can move your camera onto the whole aircraft (when they have an interior made besides the cockpit)

[timid dove]

that's just a child object of the plane

no physics involved

you wouldnt give the player a separate RB

[shadow rock]

ooooooh

[bold island]

Im having an issue in my game where the player character asset isnt falling down at all. I have a rigidbody on the player character, use gravity is on and gravity in the settings is set to -9.81. i havent frozen any of the positions, only rotations. when i play, the character is suspended in the air and only rotates around according to wasd key movement, but doesnt change x, y, or z coordinate. what is the problem?

sorry for the 'essay'

[timid dove]

maybe it's resting on something
Or maybe your code or some other component is constantly moving it to the same height

could be a lot of things

you'll have to show more details

It would be helpful to see:

• The inspector of the character (showing all components and their setting)
• Your code
• scene and hierarchy especially with collider gizmos showing

[paper basalt]

Does anyone know why something with a rigidbody and box collider keeps clipping through a floor with a collider? The object moves using rigidbody force.

[inner thistle]

Does it also rotate using torque?

[timid dove]

looks like an object your player is holding perhaps?

Can you show how the movement works?

[timid dove]

surely not given the constraints on it

[inner thistle]

Yeah that's what I mean, it's strange that it's tilted but all rotation is constrained

[timid dove]

yep

[paper basalt]

Oh I figured out what it was. There's a slight correction at the end to straighten it out and that correction wasn't slight enough.

[thick monolith]

Anyone know a tool, or have suggestions how to approach this problem?

I want to define "zones" in my game similarly as seen in the video. When the player enters a zone, I plan to module SFX and similar. To do this, I need to be able to quickly draw the zones (preferably in a similar way as shown in video - 2D); The zones can be non convex shaped but may consist of multiple convex colliders if that is possible to achieve quickly.

Also off topic, but what happend to ProBuilder :V The PB Window is no more 🤔

[timid dove]

#🛠️┃probuilder for that question (no idea)

[timid dove]

as for this - well where did you get this video from?

Looks basically like drawing a 2D shape and then extruding it. Dunno if PB can do that or if you would need to make a custom tool (or just use whatever tool is in that video)

[dull shuttle]

I have a very odd problem.
I implemented crouching in my game by changing mesh in Mesh Collider, in editor everything works fine but in the game's build player falls through the ground when crouching. What should i do?

[silver moss]

Why are you using a mesh collider for the character in the first place?

In most cases, a primitive collider like capsule would do.

[dull shuttle]

i want use cylinder as collider

[dull shuttle]

i used to use capsule but it allowed the player to jump too high with edges of platforms

[thick monolith]

This is my video, just used PB to illustrate what kind of behaviour I'm looking for specifically. Doing this by hand (placing collider triggers) is too time consuming

What I'm looking for specifically is and am curious if such a tool already exists (the detection part I already have):

1. Draw a shape
2. Make it into a volume
3. Convert volume into smaller convex shapes if needed
4. Set isTrigger=true
5. Detect enter/exit events

[timid dove]

I think that's way too niche/bespoke to have a prebuilt tool ready to go for it. You can build such a thing yourself as an editor tool with the ProBuilder API.

[stiff roost]

I have an issue with raycasts, im making a flight sim game and i want to do interactane cockpits(meaning being able to physicaly click on buttons in the cockpit with my cursor) however the plane along with the camera and colliders is moving at mach 1.2 meaning it doesn't register the hit even when the rigidbody is set to continous dynamic. is there anything i can do

[timid dove]

You're going to have to do a lot of "smoke and mirrors" type things in such a game to get it to work properly.

I would probably have all the internal cockpit objects exist in a separate physics scene that isn't moving at all, and do the raycasts there, using the camera's local position inside the cockpit as if it were at the origin in the separate scene.

[stiff roost]

i guess that would be best but also the most complicated, on the plus side it would also get rid of the vertex snapping happening at long distances

[timid dove]

yes

you'll still have to deal with that for the main game world though

You'll want to be using floating origin for that.

[bold aspen]

I'm trying to do raycasts from the camera to the world, and get a single hit. For game logic reasons, the ray shouldn't collide with the character the camera is following.

I remember reading somewhere that raycasts are not at all times guaranteed to be in order of closest to furthest, I'm asking because I'm interested in EarlyOutOnFirstHit so the engine just stops processing hits ASAP, but this wouldn't work as expected if hits aren't guaranteed to be in order?

[timid dove]

a regular raycast always returns the closest hit

if you use RaycastAll, the results will not be sorted by distance

[bold aspen]

        public struct IgnoreFollowingEntityCollector : ICollector<RaycastHit>
        {
            public bool EarlyOutOnFirstHit => true;
            public float MaxFraction { get; private set; }
            public int NumHits { get; private set; }

            Entity followingEntity; // Entity to ignore

            public IgnoreFollowingEntityCollector(Entity followingEntity, float maxFraction = 1f)
            {
                this.followingEntity = followingEntity;
                MaxFraction = maxFraction;
                NumHits = 0;
            }

            [BurstCompile]
            public bool AddHit(RaycastHit hit)
            {
                if (hit.Entity == followingEntity || hit.Fraction > MaxFraction)
                    return false; // This is the very same Entity we are following, bad!
                MaxFraction = hit.Fraction;
                NumHits++;
                return true; // This is valid! Winrar
            }
        }

[timid dove]

the ray shouldn't collide with the character the camera is following
This is best accomplished via layermaskes

[bold aspen]

I know this is an alternative but I'd rather not mess around with layers with the player character just so the raycast from the camera that is following the Entity doesn't collide with it, and making a layer just for 1 game function seems silly.
But yeah the main reason is that the raycast doesn't have to collide specifically with the Entity that is following, meaning other characters has to collide

but if results are in order it'll be fine then.

is there a quick list about what returns in order or not? I'm also interested aboutSphereCastCustom

Not sure if I'm blinding it in the docs?

[vagrant ingot]

Hello
I want to override a box collider 2D by an another box collider 2D which will exclude a specific layer. So, I create a box collider 2D and put the layer Override Priority higher than the other collider 2D (put at 10) and exclude the layer I want (Player). But, when I launch, it doesn't work, why ?

I verify that my player have the player layer

[timid dove]

I want to override a box collider 2D by an another box collider 2D
What do you mean by this? Colliders cannot "override" other colliders

are we talking about a prefab instance or variant or something?

And what does "launching" mean in this context?

[tacit cedar]

I have a very small project; is there anything I can do about the skin width with dynamic rigidbodies? Do I just have to scale up the project or start using kinematic?

[timid dove]

reduce the default contact offset and/or move your graphics down a little

[tacit cedar]

I've tried the first option, but unfortunately it still leaves the noticeable gap. Any lower and the player does begin to bounce into the ground on contact. As for the second option, I can't see that working without making the probably worse in the other direction: the ceiling collision would look worse twice over, right?

[timid dove]

not if you make the collider shorter

there's no reason the collider and the sprite need to be the same height

[turbid ember]

got an oddball "optimization" question and curious if anyone here knows but what is better?

• physics object with individual primitive collider game objects (that approximate the shape of the object)
• physics object with many primitive collider components on the same game object (that approximate the shape of the object)

my workflow for physics objects has generally been just spawn unity gameobject cubes/spheres/capsules and scale them to approximate the shape of the object, and then just disable (or sometimes remove) the mesh filter/renderer components

but is the latter here better? I imagine it is but just curious

[sage whale]

does this seem like a correct way to have the hand pull the body around? its a very basic _torso.AddForce(-_pullDirection);, which works, but it feels a bit fake and floaty

[timid dove]

It really depends on what you're going for. How about a spring joint?

[sage whale]

i was using a spring earlier to attach them, and reduced the springs distance as the pull got stronger, but it ended up not working out. Currently only a distance joint connects them now

https://youtu.be/vcRBT9Q9jXM?t=197

im trying to match the way a hand would pull up a real body, like this guy does (minus any time where he pushes up with his feet)

should I have a spring that i can contract as the torso of pulled towards the hand, then start applying an upwards force once the torsos y position is higher than the hand?

[timid dove]

Ok you're trying to do a rock climbing thing

that would be FixedJoints or DistanceJoints for sure

[next mountain]

BOULDERING MENTIONED

[keen skiff]

Hey! I made a full body first person controller by watching a tutorial. Walking/strafing left-right doesn't cause any issues, but when I walk or strafe (?) forward or backward, my camera behaves weirdly. I've attached a video. What might be the issue?

This is my player controller script: https://pastes.dev/OHxU8FYs0J

I assume this is the right place to ask this, correct me if I'm wrong

[timid dove]

Definitely not a physics problem

#💻┃code-beginner

Also I don't even see what's wrong in the video

[keen skiff]

Thank you

[keen skiff]

When you walk forward, the camera behaves in a way it shouldn't, isn't it obvious?

I'm walking forward without even touching the mouse and the camera rotates to left and right, just a little bit

[timid dove]

I have no way of knowing what you're doing with your mouse]

[keen skiff]

Turns out I didn't choose Bake Into Pose for walking animations, fixed now 👍

[round glen]

I am creating a ragdoll character by following Happy Chuck Programming's video, when I try to animate the ragdoll character to walk, it automatically faces the floor.

[short sable]

I can I fix this issue? I have added a physics material to my player cause he kept getting stuck on walls but somethings when I am on the edge like in the video it becomes slippery and sometimes the ground is slippery as well.

[timid dove]

Well yeah you removed all friction

So it's slippery

[hazy hill]

i import this model to unity, give it a mesh collider and it crashes

can anybody tell me why?

[unique cave]

Are you aware that the model has 1208320 triangles? That is magnitudes too much for an game asset. Most likely just using a single box collider for the dice would be enough for a collider, depends what you need it for. If it is just a small prop among others, you would want to use at most couple dozen triangles on it and a texture to draw the dots. If you are making a game about ant walking on top of small everyday objects, then you would need bit more details, but definitely not million triangles.

[hazy hill]

but i love triangles :(

[unique cave]

Computers don't

[hazy hill]

anyways thank you for the help :)

[hazy hill]

dw ill make unity love it

[unique cave]

This is something you would see in a blender horror movie

@hazy hill so what is this asset supposed to be used for?

[hazy hill]

awwww its not that bad it just... alot of lines... yeah

[hazy hill]

oh just learning blender and making models, i should really go for low poly stuff but wanted to try some high poly stuff

[unique cave]

that's more than million triangles that the GPU needs to render separately, let alone the amount of computation needed by CPU to do collisions with when used as a mesh collider. You would only want to use the minimum required level of detail and not add more triangles because you can. Even if you needed very high quality visual mesh, the physics shape can usually be much simpler (like a simple box collider or a mesh collider simplified by a lot). Btw. you can use different meshes for a mesh collider and the visual mesh so you can use simplified one for physics.

[hazy hill]

so wait if i just use a box collider im good yeah?

and yeahh i should remove some faces ig

[unique cave]

sort of. If you don't need mesh collider, don't use it. It's in general bit heavier than the primitive colliders. You wouldn't definitely want to have the visual mesh anyway near that level of detail though. Game assets and high quality render assets are very much different

[hazy hill]

ohhhhh so like its fine for rendering but not for a game your saying

[unique cave]

That would indeed be fine if you just wanted to use it to render something in blender. As said, in realtime applications you would only want to use the absolute minimum amount of complexity required to meet the visual quality requirements.

[hazy hill]

thats some helpful information actually thank you!

[unique cave]

If it is just a small side prop, even something like this would be more than enough to look good when combined together with a texture that has the dots and a normal map to make the dots look 3D

I think in blender there's even an option to use the high quality mesh to bake the details into the low quality one in a form of normal map. Don't really remember how to do that exactly though

https://www.youtube.com/watch?v=l8xrSgyfEHs

[hazy hill]

ive put it into my playlist thank you so much for the help!! :)

[unique cave]

This is what I got with the above mesh with color and normal textures baked from the high resolution mesh. Especially if it is a small prop, the player would not notice anything wrong there

[short sable]

Even if I do change the value to stop the player sliding another issue happens where the player will slow down when colliding with the wall

and I get stuck on corners when jumping on something

[hazy hill]

and you used the vid you linked to do it?

[unique cave]

yes, for the normals. It doesn't explain the color baking but it's pretty similar process

[stuck bay]

I apply force of (9999999999f, 9999999999f, 9999999999f) using AddForceAtPosition, Impulse mode, and the target rigidbody has 0 damping and 70kg mass.
And it doesnt move at all.
I set the mass to 0 and it flies to the end of the world

Im wondering whats going on, I know Impulse mode uses RB's mass but no way 70kg would cancel such huge force

rootRB.AddForceAtPosition(hitPoint, new Vector3(9999999999f, 9999999999f, 9999999999f), ForceMode.Impulse);

Got it to work with normal .AddForce

[grim kernel]

Hi! Any idea on why my player movement feels so floaty?
also the slope movement feels horrible, small bumps shoot you in the air

[timid dove]

presumably... it's your movement code.

[grim kernel]

player movement is basically getting a vector2 from Unity's Input System and set X and Z velocity

[timid dove]

you're probably inadvertently setting the y velocity to 0 in that process too

e.g. you're doing rb.velocity = movementVector;

and movementVector's y component is 0

[grim kernel]

i dont think so, i just set the X and Z values

[timid dove]

that's a very common pitfall

[timid dove]

exactly

so y is 0

show your code

[grim kernel]

i use playmaker / visual scripting so idk if you can help me but its simple

i basically set the X and Z floats every frame, and Y is none what means its usually unaffected

[timid dove]

i don't really know how playmaker works but I would try feeding the rigidbody's current y velocity back into y here explicitly.

[grim kernel]

it changed nothing, im also pretty sure none means its unaffected so makes sense

unless ive done something wrong

[timid dove]

then some other part of your script/code is doing it

how are you actually handling the jumping part

[grim kernel]

adding Y force/velocity

[timid dove]

In C# "none" isn't really an option so i'll chalk that up to unfamiliarity with playmaker

[timid dove]

show it

[grim kernel]

i mean jumping only activates after a key press, player is always floaty

[silver moss]

What's the rigidbody drag set to?

[timid dove]

ah yeah drag could totally do it

also just - having low gravity in physics settings

[grim kernel]

check if grounded, true = "add force"

[timid dove]

or having very large objects

[silver moss]

(Linear damping in new unity versions)

[grim kernel]

i didn't change anything on gravity, nor did i scale the objects up (player is a 1x1x1 default capsule)

[timid dove]

Alright then - this?#⚛️┃physics message

[grim kernel]

oh yeah im using unity 2022 btw

[silver moss]

Ok thats not the issue then

[timid dove]

You sure there's no other scripts involved here?

or other components?

[silver moss]

Maybe the player object just has a massive scale?

Which would appear to fall slower

[timid dove]

We did discuss that

[silver moss]

Oh

[grim kernel]

its a 1x1x1 default capsule

[timid dove]

Based on everything you've shared so far it should not be so floaty. So... something is happening that's not part of what you've shared thus far

can you show the inspector for your player? What are all the components on it?

[grim kernel]

ive made a no friction mat for the player collision, but the default friction changes nothing (and makes the player stick to every wall/surface)

[timid dove]

friction shouldn't matter while it's just in the air not touching anything

[grim kernel]

there is another script that sets the playerSpeed variable when pressing shift, thats all

[timid dove]

can we see that one?

We actually haven't seen the full script yet for either script. I know it's in PlayMaker but it mnight be helpful

[grim kernel]

there is no "full script" in playmaker, its connected nodes and all the script is separately in every node

[timid dove]

well I mean the graph of the nodes

the full graph

[grim kernel]

thats it lol

[timid dove]

ok so the Move node looks like what

[grim kernel]

pause is just called when opening UI elements etc

[timid dove]

Ok really dumb question here. What happens if you just remove or disable the playmaker graph entirely and place your player high in the air in the scene?

Or any other random unity rigidbody cube without any script

does it fall at a normal speed?

[grim kernel]

already tried it, same thing

super floaty

[timid dove]

What about a default cube

also floaty?

If so then you should just go check your physics settings

also your Time settings

[grim kernel]

it really feels like the player is a balloon, and hitting any bump or walking up a slight slope shoots the player up in the air

[timid dove]

Check the default cube

[grim kernel]

where can i find the time settings?

[timid dove]

Project Settings -> Time

[timid dove]

those look normal... I still wonder if default cubes fall normally

[grim kernel]

everything is floaty

[timid dove]

Not sure how to print things in playmaker but can you do like Debug.Log($"gravity: {Physics.gravity} time scale: {Time.timeScale}"); in Update in a script?

perhaps one of your scripts is changing the gravity or the time scale at runtime.

[grim kernel]

like read the gravity and time values at runtime?

[timid dove]

using UnityEngine;

public class Test : MonoBehaviour {
  void Update() {
    Debug.Log($"gravity: {Physics.gravity} time scale: {Time.timeScale}");
  }
}```

yes

you can plop this C# script on any object in the scene to do it^

[timid dove]

and then look at the console while the game runs

[grim kernel]

here are some rigidbody "cubes" falling

[timid dove]

those do look a little slow

[grim kernel]

deltatime is always changing abit but i guess thats normal

at runtime

[silver moss]

Does it happen in a fresh scene?

[grim kernel]

yes

[silver moss]

I mean the default cube test, do that in an empty scene

No playmaker scripts, no extra objects or anything

Just to narrow the issue down

[grim kernel]

slope boosting might be the player movement script that tries to move straight instead of walking "up"?

[silver moss]

(Also what is gravity weight? Are you using root motion or something?)

[grim kernel]

this seems to work, but now im just more confused lol

[silver moss]

That looks normal, assuming those ara 1x1x1 cubes

Yeah

[grim kernel]

yes

[silver moss]

So what about this @grim kernel

[grim kernel]

what does that mean

if you're talking about animations then no, player has no animations

[silver moss]

Okay I just saw this in your video so I was wondering

[grim kernel]

oh thats just something that showed up because i searched for "gravity"

[silver moss]

Anyway im out of ideas. Might be something related to playmaker that I dont know

Does the player have any children or other components you havent shown?

[grim kernel]

yes alot actually

but its mostly empty objects for pivots, and the camera

i just added playmaker scripts onto the cubes and they still behave normally

[silver moss]

Does any of the children have rigidbodies or colliders?

[grim kernel]

nope

all pivots and a camera

oh and audio sources

plus a trigger area, just a collision

[silver moss]

PlayerTrigger does not have a collider?

[thorny yacht]

What kind of collider 2D can I use for meshes generated in mesh chunks?

[timid dove]

Well no 2D collider will automatically work with mesh filters, but you can use PolygonCollider2D or EdgeCollider2D for arbitrary shapes.

[thorny yacht]

and I suppose I have to code the collision shape since it won't just shape itself

[timid dove]

yes

but if you're already generating meshes...

That should be trivial

[round glen]

I am creating a ragdoll character by following Happy Chuck Programming's video, when I try to animate the ragdoll character to walk, it automatically faces the floor.

[coral mango]

Link the tutorial you're following, and where in it you are?

[round glen]

https://www.youtube.com/watch?v=iNLQCwCHEBM&list=PL9gnJgSxuivEf8D6upAd5aNj6H4OFWt4m&index=4 Around 11:40

[thorny yacht]

I created a script that add point to the polygone 2D collider here: But I don't see the gizmo line and player dont collide.

[timid dove]

Note that the positions in the Collider should be in local space

It looks like your positions are starting approximately at the object's actual world space position so I'm guessing you used world space positions in your code here

[thorny yacht]

By local space do you mean I should use integer for vector2D ?

or using transform position

[timid dove]

No..

I mean local space coordinates

instead of world space

you can use transfom.InverseTransformPoint to convert world space coordinates to local space coordinates (just make sure you're using the right Transform)

[round glen]

I fixed it.

[vital whale]

hey everyone

Given a track's metal barrier such as this, what is the best collider to use? Mesh collider is far too expensive for my taste and doesn't work when I use it either for some strange reason

I just need to collide with the barrier walls, so something as simple as a plane approximating the curve of the barriers should be emough but there is no way to collide with such a thing

[timid dove]

My first instinct is to just use a bunch of BoxColliders

[vital whale]

That is what I had in mind as well, but I felt it would be a messy way to apprxoimate it

especially if the track changes

There is no 'plane' collider in Unity from what I saw

[timid dove]

if the track is using a spline system (i hope it is) it would be pretty easy to generate teh colliders programmatically

[vital whale]

that is, a collider with a zero-thickness plane in 3d space

[timid dove]

otherwise any time you want a collider that's not one of the primitives, your only option is MeshCollider

[vital whale]

hand-modelled unfortunately, I modeled it by arraying road segments along a spline in Blender

[timid dove]

the basic Plane object uses a MeshCollider that is like this

[vital whale]

The spline is only in Blender

[vital whale]

hold on give me a second

[vital whale]

this is what I mean by a plane

A single-sided 3d object, or a 3d object that is infinitely thin

a mesh collider cant work with this since it is not convex right?

[timid dove]

I mean I understand what you mean

[timid dove]

MeshColliders don't have to be convex

they can be convex or concave

[vital whale]

but then they significantly hurt performance right?

[timid dove]

I still think BoxColliders are the best choice though

[vital whale]

Hmmm I see

[timid dove]

Could be - but the main limitation is Concave colliders can't be on a dynamic body.

[vital whale]

well I have the splines representing my track as an SVG. How do you suggest I bring them into Unity? I've read about this technique before but I am not quite sure how to do it

[timid dove]

I don't know of a quick and easy way to automate that particular workflow

probably find an SVG parser and then use the curve data to generate box colliders

you could also maybe do something with the mesh - like put some marker objects at each juncture and use those to generate the colliders

[vital whale]

Sure!

thank you!

wait i didnt mean the colliders

I meant creating the road itself using splines

[timid dove]

Oh - I would recommend Unity's Spline package https://docs.unity3d.com/Packages/com.unity.splines@2.8/manual/index.html

https://docs.unity3d.com/Packages/com.unity.splines@2.8/manual/extrude.html

[vital whale]

Thank you!!!

So I simply use this to create the mesh at load time?

[timid dove]

You can do it in many ways

you could do everything at design/edit time if you want

or you could set it up so it gets genrated at runtime

[honest river]

How to get gravity vector in C# that was set in project settings?

Physics.gravity.magnitude I guess

[silver moss]

Just Physics.gravity, unless you actuall want the magnitude of it

[brittle kiln]

is anyone a expert on raycasts? i have a strange issue were my raycast hits, but if its a object thats transforming towards the player, it hits slightly inside that object

(any suggestions?)

[timid dove]

When are you doing the raycasts? How is the object moving?

The physics scene is only updated during the physics simulation step, which doesn't happen every frame and is right after FixedUpdate

if you're moiving the object directly via its Trasnform in Update, for example, then the physics representation of that object may lag behind a little.

[brittle kiln]

just a simple object transform, no ridgid bodies etc

[timid dove]

yeah that's your problem then

you have essentially two options:

• Raycasts need to go in FixedUpdate so they're happening in cadence with physics updates
• Youneed to manually sync the transforms to the phyics system before doing your raycast (can be nonperformant, depending)

[brittle kiln]

as its a object transform and not a ridgid body, would it be classed as physics still?

this is my ignorance so my apolgies

lol

i will attempt those suggestions asap, thank you kindly dude

it currently uses a simple box collider, and sometimes mesh collider. it has no issues hitting if the object is hit as it transforms away from the player, or when it transforms side to side, it seems to only be head on.

il get to trying those changes and see what happens, thanks again 👍

[timid dove]

yes of course

colliders

raycasts

these are all parts of the Physics engine

As a general rule of thumb though any object with a collider that moves should likely have a Rigidbody

even if it's kinematic

[brittle kiln]

il keep that one in mind, as i have used it in other parts, as it seemed to help collision better.

[silk dirge]

fast moving bat can't collide with objects, i tried collision detection "Continuous" and interpolate to "Extrapolate" but still same result object pass trough without colllide

[solemn plover]

Check out this video by Bennet Foddy, he goes into this exact issue https://www.youtube.com/watch?v=NwPIoVW65pE&pp=ygUUYmVubmV0IGZvZGR5IHBoeXNpY3M%3D

Hi everybody. I am dealing with an issue where I have small balls that are attached to my humanoid joint chain to visualize it's "joints" for the audience. For some reason they are flipping out and throwing the agent around the entire map.

It doesn't happen without these balls, and I believe it has something to do with the joint that it uses... I tried upping the linear limit in case it was freaking out due to being too constrained but no luck. Any ideas?

[twin nebula]

Is the physics debugger working for anyone in Unity 6?

For whatever reason everything is invisible. I'm trying to visualize stuff via the rendering tab and I'm not getting anything

Nevermind there were like 5 overlapping black menus bottom right and one of them were what I wanted

[glacial mica]

Can someone help me? I am (somewhat) following a movement tutorial, and I made my own dash system. whenever I dash into a slope / corner, my player will fly into the sky, depending on the angle.
https://youtu.be/FV8AezXf3vM

[worn mantle]

Excuse me, I'm having some problems dealing with rigidbodies themselves. I have a player character with its own rigidbody. I have items in the world that each have their own rigidbody. When i pick up an item, i want to "give" the colliders / object to the player, and parent to player. (make the rigidbody not work at all). When the player drops the item, i want to let the rigidbody come back on, and let it handle moving the items. If i did just Destroy(rb) and AddComponent(rb) i would have to store every single value on the rb to set them after adding. what ways are there to keep a rigidbody reference while "disabled"? (I need it to be able to collide while in players hand, and recieve OnCollisionEnter callbacks)

[timid dove]

One option is to make the colliders and renderers of the object into a prefab (which is a child of the RB). When you grab the object you could instantiate just the colliders/renderers part as a child of the player. When you let go you could either respawn the original object or re-enable it.

[worn mantle]

Yeah ok, that is an option i didnt think of, thank you. I wanted to keep all the data of the objects, and didnt wanna have to create 2 seperate objects for ground/hand, but that would work.

[haughty carbon]

How do you render thousands of particles to generate a fluid like simulation?

[timid dove]

Compute shaders and/or the job system

[prime flower]

Anyone know of a general performance comparison between PhysX and Unity Physics in DOTS?

[solemn eagle]

hi, i have a question, im making a 2D game, and...why my character glues to walls?

everytime i jump towards a wall, this one sticks to it till i jump, how i can fix it?

[timid dove]

very common pitfall

likely due to your code pushing hte object against the wall and then friction is holding it up

your options are:

• make your code not be able to push the object against the wall midair
• get rid of friction (via physics materials)

[solemn eagle]

what if i have 0 friction on the player?

or what would be a desirable amount of friction for dont make consequences and not stick to walls

[timid dove]

I mentioned that as an option, yes

[solemn eagle]

no i mean, the issue is friction, but i thought the plan was to lower it no delete it, so if i delete it, it will be ok?

[timid dove]

define "ok"

your object will have no friction

if that's what you want, go for it.

[solemn eagle]

no consequences, like, it will be slippery?

[timid dove]

it will be slippery

that is the consequence

[solemn eagle]

dang

then what's the perfect amount?

[timid dove]

You are the game designer

I can't answer that for you

it's your game

[solemn eagle]

ok

well thanks

[tawdry sigil]

how do you use joints to make a car im trying to do it but when im rotating the wheels the car jumps and doesnt move but when I dont rotate the wheels it can move

[proud knoll]

anyone ever had it where rigidbodys slow the game down to almost a freeze? only noticed it when i upgraded unity to latest

ah degraded to .45, is fine again, guess some issue with ..47

[silver moss]

Normally you dont use physically rotating wheels, the physics engine isn't really built for that

Try wheelcolliders perhaps

[sage whale]

one approach that I find works nicely, is to a box and sphere rigidbody, and connect them with a hinge. Force can be applied to the box, which will roll the ball forwards, and you can steer by applying torque to the box to rotate it

ive found the wheel colliders unity have are very jank, sometimes dont actually roll in a straight line, overall they feel really inaccurate

plus settings it has that arent always desirable, like slipping (which makes them more physically accurate, not great for arcade type vehicle dynamics), have no way to be fully disabled. The most you can do is change values until the effect becomes harder to notice

[solemn eagle]

Hi, in my 2D plataform game, why when i dash towards a wall i normally get stuck to it?
i mean, i PHASE IT, and due that i get in the inside

[glacial mica]

I had a similar issue, make sure you have interpolate on, and continuous collision detection. If that doesn't work, you could check OnCollisionEnter, then teleport your player back out

[solemn eagle]

em, how i do so?

sorry for my noobness...

[glacial mica]

in your rigidbody2d, you should have a box that looks something like this

(dont worry, i am also very new, and only slightly know what i am doing)

[timid dove]

that depends entirely on how your dashing works

[unique cave]

Interpolation doesn't affect the physics behaviour in the slightest, only the visuals and I'm surprised if the collision detection mode helps here either. I don't think they mean tunneling (going through walls) by getting stuck

[severe moth]

Make sure the dashing moves the rigidbody in a valid way, so that it doesnt skip the physics simulation step.
Also depending on how the dashing works, if you still have tunnelling issues (phasing through colliders) due to the rigidbody moving too far between simulation steps, then you could do a raycast beforehand in the dash direction, so that you know the max dash distance

[glacial mica]

Sorry, wasn’t aware of that. I am also quite new to this, and in my projects, that usually solved it.

[unique cave]

I might have also misread something. I thought they meant sticking to walls, not tunneling through them. In that case continuous collision detection might certainly help though it requires appropriate method of moving the player that respects collisions

[worn mantle]

Hello, i would like some clarification on how Collider.Bounds work. the green convex mesh is the mesh im using for this detection. the red box is the colliders world space bounding box. how can the collider be outside the bounds? physics.UpdateTransforms is on, and the bounds is called OnTriggerEnter, first frame that the collider enters the ground, and it enters from the right side of the screenshot i took.

[timid dove]

how are you visualizing the box?

[worn mantle]

calling D.raw(meshcollider.bounds)

[timid dove]

it certainly shouldn't be this way - it should be the minimal world space AABB surounding the actual collider

[timid dove]

What is this Draw function?

[worn mantle]

Vertex's debugging package

I think you were the one that told me to use it way earlier

[timid dove]

Can you show the code? It's most likely an issue with the gizmo drawing not the bounds itself

very possible

[worn mantle]

https://paste.ofcode.org/gqPJzDqD6s3FXCpnYxrjse

[timid dove]

taking a closer look at this screenshot it appears there are multiple colliders here

there's a greenish rectangle-shaped collider inside the hold - maybe that's the one that's being drawn?

[worn mantle]

the box is drawing the bounds of the mesh collider, the green thats inside the box is the drawing for the terrain itself (what the terrain is editting)

the cyllinder collider on the tool shouldnt be a problem in this calculations as its not a trigger collider and therefore cannot call ontriggerEnter with the terrain

[timid dove]

It looks like you're doing this in OnTriggerEnter - is it possible the tool moved since that exact moment?

maybe that's where it was when OnTriggerEnter happened and now it moved

[worn mantle]

ill do a OnTriggerStay draw as well to debug then, give me a minute

so somehow, the trigger mesh collider, "trips" the enter function before its supposed to enter the ground.

because what is supposed to happen is the tool comes from the left, hits the ground, then pulls itself right, tilling the ground

and it "hits" the ground way below where it is otherwise

as always, thank you so much for the help, solved one problem, created two more

it could be a problem with it trying to interprolate the velocity wrong, or a problem with physics being fixedupdate while animation is continious Edit: I think its a problem with shoulder width and animation

[timid dove]

I would say - using OnTriggerXXX for this is probably not the best approach

seems like something you would just want to raycast or boxcast for

with the hoe itself being mostly a visual element

[worn mantle]

I want to eventually use the hoe's mesh collider for accurate collisions with the ground. Only reason i havent yet is that i cannot figure out a way to enable OnCollisionEnter while also allowing the collider to "Go into" the terrain. this way was mostly a prototype to debug whether i had the grid areas correct. what reasons would you give to advise against doing it the way im trying to?

[timid dove]

It's harder to control

Is there a good reasons you need that level of accuracy

[worn mantle]

my game involves chopping trees, tilling ground, things that i want to emulate real life of. i want to make the gameplay feel "stylised realism" to the player. Going up to a tree, and breaking parts of the log till it falls, tilling the ground to plant seeds. i want it to have a ton of physics interactivity.

[sharp rock]

How would i go about mass simulating physics trials? the most common method, to my knowledge, is to have tons of simulations running at the same time that each record their own data. But is there a more efficient way that I'm unaware of?

[bleak umbra]

Efficiency depends on optimizations specific to the simulation. Without more info, there are no suggestions

[sharp rock]

The only independent variable in my case is the force value added to a rigid body. So it's only one moving object in a static environment.

[timid dove]

Make sure you're manually simulating with Physics.Simulate instead of "letting it run"

[proper sluice]

im making a grid based game and would like to use a box collider for the player but i remember in the past running into an issue where the players movement randomly gets stopped and stuck, so i would typically just make my life easier and use a capsule collider instead. but if i did want to stick with a box whats the best way to deal with this issue? i remember i tried a physics material with no friction but that didnt help

[timid dove]

2D or 3d?

[proper sluice]

a 3d project but it plays like 2d game only working with 2 planes

[timid dove]

If you use 2D colliders you can use a composite collider2D for the world and it will merge all the collider geometry into one mesh

you can use a tilemapcollider

[timber mason]

Hi, I'm struggling with a problem. I have a character that consists of 3 rb's, one for the body, and one for each foot. The feet are seperate bodies that control the movement of the character, and the body follows. I have IK that uses the feet as targets for the foot. But my problem is the collisions. How can I make collisions that happen to lets say the knee, stop the foot from moving. I have tried some complicated joint system, but that influenced the movement too much. Is it possible to simulate collisions that happens one place onto another body? Can I make the leg-colliders work for the feet without them being childs of the feet? Where do I look to solve this?

[proper sluice]

would this work if im creating and destroying blocks during runtime? does it update in real time to merge the colliders so the player wont get stuck?

[timid dove]

You can update it in real time yes

[ebon oasis]

(sorry for reposting but last time I had to go and couldnt respond)
when I turn dirrection of my character, he does a little hop and for a moment looses contact with the ground. it only hapens on a tilemap (I checked the colisions)
the problems are the small hops not the jumps
any ideas what could cause this?
btf I am really new and not good at this

also this is the tilemap colider settings (dont know if it helps)

the players colider settings are in the video

[timid dove]

Are you not using a CompositeCollider 2D?

Looks like not based on your collider screenshot

You should be.

[ebon oasis]

well no I figured that I should use the tilemap colider for tilemaps

[timid dove]

It works together with the tilemap collider

[ebon oasis]

how?

[timid dove]

It merges all the collision shapes into one shape so there's no bumps

[ebon oasis]

so do I just add it?

[timid dove]

Add it to your tilemap object
Set the composite operation on the tilemap Collider to Merge

And set the mode on the composite collider to Polygons

(forget what that field is called)

[ebon oasis]

still hopping

I have it like this

[timid dove]

And the tilemap Collider now?

[ebon oasis]

ou yea I forgot tyo set the merge sorry

it works now

thx a lot

[timid dove]

👍🏻

[ebon oasis]

also if you dont mind, what exactly does the composite collider do and why do I need it?

[silver moss]

#⚛️┃physics message

[ebon oasis]

so does it work with other colliders too? (like if I had multiple colliders on one object)

[timid dove]

All of your questions are answered here https://docs.unity3d.com/Manual/2d-physics/collider/composite-collider/composite-collider-2d-reference.html

[ebon oasis]

nice, thx

[timid monolith]

i am so confused. i have been trying to get shadow casts for when the animal is on the hole and its not working. does anyone have an idea? my mes renderers all have shadowcasts on and my cylinders do as well

the main goal i want is for the animals shadow to visibily be on the hole

[timid dove]

ShadowCast?

what's that

doesn't sound like anything having to do with physics

[timid monolith]

what would it be under then?

[timid dove]

#archived-lighting ?

[timid monolith]

oh

im so slow

im sorry

[junior dew]

Some people use a flat sprite of a dark shadow shape placed under the object. You could do the same, and when your bunny collider collides with the hole's collider, then the shadow object could be enabled, and disabled when collision ends.

[paper dirge]

I am trying to simulate UR robots, but when i tried with hinge joints + mesh colliders + motor control using PID,
joints started rotating crazy, my PID controller is perfectly fine,
there is something wrong with game physics, pls help me find the issue.
thx.

[timid dove]

I think you should try Articulation Bodies for robotics

[frail kiln]

i followed this tutorial (https://www.youtube.com/watch?v=NsSk58un8E0) which uses the KinematicCharacterController by Philippe St-Amand (https://assetstore.unity.com/packages/tools/physics/kinematic-character-controller-99131), and i'm attempting to add a grappling mechanic much like in white knuckle. i got the spring physics working, i'm unsure of how to apply a damping force on it though, because right now the character will infinitely spring back and forth wildly around the grappling point

[silver cave]

does anyone know how to rotate a gameObject with the center of the object being where the axis of rotations are? I notice that when i use the rotation tool in the editor, it works differently from just changing the rotation values in the transform of the object.

[timid dove]

set your tool handle position to Pivot

[silver cave]

how do I make sure the object uses center through code when I rotate it using its transform?

[timid dove]

It always rotates around its pivot

Center mode is just a convenience tool in the editor.

If you want it to rotate around a different point you need to change its pivot or introduce a parent object and rotate the parent

[paper dirge]

I am trying to control the joints using force input, just like in the real robot, but i couldnt find a way to input force in articulation body

[timid dove]

https://medium.com/@sean.duggan/unity-physics-using-articulation-bodies-1da02f93932a

Articulation Bodies are pretty much purpose built for robotic things

[paper dirge]

Thanks, i looked through this, but as i said, i want to move things using torque, which in this case is done in background, i cant access the torque values.
I can only input target position or velocity, i need torque input.
In robots, you set certain current to generate certain torque.

[timid dove]

AddTorque and AddForce are available on Articulation Bodies just as they are on rigidbodies

But there's also so much more.

Have you perused this?

https://docs.unity3d.com/6000.0/Documentation/ScriptReference/ArticulationBody.html

[paper dirge]

Yep, thats what i am doing right now😅

addtorque

[paper dirge]

add torque with hinge joint is currently working for me, i will look through this as well, thanks

[grim mica]

Hi, I imported an .fbx file to Unity and put the model into my game, I added a mesh collider but when I go to drag the model into this Mesh field it doesn't let me

when I click the + on the right, it opens up other models in my assets folder which I can assign, but not the model itself which needs the mesh collider

[silver moss]

The FBX itself is not a mesh, it's a collection of meshes

Drag one of its child meshes into that field instead

[grim mica]

thanks, professor just said to use fbx and I didn't understand the difference

[worn mantle]

Hello, Wanted to ask something about controlling your character. I'm looking multiple places for info about how to handle first person game movement (look / move). I'm wanting to use a rigidbody for movement, as it allows my character to push things / interact. The problem ive found, is that if you try to look with rigidbody, you need to turn off y constraints. when you do this, other things you interact with turn your vision, and its incredably annoying to the player. How do you control movement fully with rigidbody, while allowing it to push / move other rigidbodies, and be stopped from moving by them. (but not have your rotation change) (For extra info, the rb is still 1 mass, and .02 angler drag, and the character using a capsule collider for physics)

[inner thistle]

The usual solution is that you don't turn the player, you turn the camera

[worn mantle]

you turn the camera for movement? then how do you have your character's model turn to "follow" the camera, as i need the model to be connected to the camera

[inner thistle]

Player container with rb + collider
↳ Container for turning
↳ Player model
↳ Camera

[timid dove]

if you try to look with rigidbody, you need to turn off y constraints
Nah you can just rotate by setting the rotation in script or MoveRotation

[inner thistle]

You move the entire player container and turn the camera container

[worn mantle]

problem with moverotation, is that it doesnt work with interpolate on dynamic rb, and the staff memeber i was talking to yesterday advised not to set transform directly if im working with rb. not arguing, just want to know like is there a "best practice"? feels like im getting conflicting info from all sources when trying to figure this out. They said that moving with rb and looking with transform in update caused problems with antianalising.

[worn mantle]

ahh move containing rb for rigidbody, and set gameobject below it for rotation of model. that does solve it, if i set the lower transform directly, thank you for your input

[timid dove]

MoveRotation does work with interpolation

but setting rb.rotation in Update also works fine for smooth FPS rotation

note that you're not supposed to touch the Transform

The Rigidbody is not the Transform

and it's not antialiasing that is the worry, it's interpolation

antialiasing it unrelated

[worn mantle]

oh, rb.rotation. thats, an easy way. thank you so so much for your time praetor. i really appriciate all the help you're giving me. and gotcha, worry about interpolation causing jitter

[broken bridge]

Would it be possible to pause the shadows of a directional light? like for an object, to pause the shadows and even if the object is moved/deleted, the shadow will stay there

[worn mantle]

maybe you could create a seperate object with the initial objects mesh, thats set to "render shadows only" and leave it at the initiall position?

oh, the directional light moved, thats more tricky

[broken bridge]

Yeah

[whole venture]

Someone able to help with collision?

OnCollisionEnter2D will not trigger, even though they are colliding

Tried switching to trigger also, and no bueno

OnTriggerEnter2D doesn't get called either

added this and its working

under overrides

even though its in matrix. so not sure

[sand island]

hi

[lilac lantern]

            updatePreview();
            Bounds bounds = new Bounds(currentPreview.transform.position, Vector3.zero);

            Vector3 center = bounds.center;
            Vector3 halfExtents = bounds.extents;
            Quaternion rotation = currentPreview.transform.rotation;

            Collider[] hits = Physics.OverlapBox(center, halfExtents, rotation);

            Debug.Log(hits);

currentPreview has a Box Collider and i've checked on the scene and the box is accurate and i have a map where i gave it a Mesh Collider and set Convex to true. so why does this log an empty list? (im trying to detect if anything is touching currentPreview i dont need to know what just to know if so if anyone knows a better method im all ears

[lilac lantern]

nvm i fixed it

thx anyway

[versed sundial]

best way to narrow down why my box collider moves into the tilemap collider going down but will stop a square short of the tilemap collider going up?

[timid dove]

Could be your movement code, the tilemap collider or the box collider

[sharp current]

I'm having an issue that is probably very easy to fix but for some reason I can't understand how

Basically I have rigidbody A and rigibody B. A is parenting B. When B is pushed towards A and they collide, I want them to lose all their momentum and stick using a FixedJoint.

Here's how I'm doing it:

private void OnCollisionEnter2D(Collision2D other)
{
    if (this.transform.Children().Any(e => e.gameObject == other.gameObject))
    {
        Debug.Log($"Room {other.gameObject.name} collided with parent {this.gameObject.name}");
        
        var rb = this.GetComponent<Rigidbody2D>();
        other.gameObject.AddComponent<FixedJoint2D>().connectedBody = rb;
        
        ResetVelocity(this.gameObject);
    }
}

private void ResetVelocity(GameObject go)
{
    foreach(var c in go.Children())
        ResetVelocity(c);
    if (TryGetComponent<Rigidbody2D>(out var rb))
    {
        rb.linearVelocity = Vector2.zero;
        //Debug.Log($"Settings velocity of {go.name} to {rb.linearVelocity}.");
    }
}

They get linked together nicely, however they do not stop as you can see from the video, and I honestly don't understand why. Has anyone ever tackled a similar problem?

(Basically this is because I need to spawn different rooms in a grid, but to not make it look like a grid and be able to create rooms of various dimentions what I want to do is spawn them in a grid and then push each "node" towards its parent. These will stick together and rinse and repeat until they are all together nicely)

[timid dove]

You're only setting the velocity of one of them to zero

Don't you need to set both?

[sharp current]

I'm setting the whole branch to zero

it's recursive

[timid dove]

But not the eoot

[sharp current]

yeah this is called on the root

[timid dove]

Root*.

Seems like you're only starting with the children

[sharp current]

if (this.transform.Children().Any(e => e.gameObject == other.gameObject)) this line makes sure of that

If the other collider is a children, then do

[timid dove]

It's not clear what Children() does but presumably it doesn't include the object you call it on

[sharp current]

and since the collision happens on both of them only the root runs all that code

[timid dove]

So yeah seems like you're not setting the velocity of the root to zero to me

[sharp current]

It does because that debug.log fires

[timid dove]

Oh wait I see you're setting it on the object itself AFTER the recursive loop

I misread

[timid dove]

Wait no

You're just doing Try GetComponent on the object this script is attached to

[coral mango]

Can't you just set the one you don't want moving to kinematic?

[timid dove]

You're repeatedly setting the velocity of the same object

[sharp current]

DAMN

[timid dove]

It should be go.TryGetComponent(...)

[sharp current]

THAT WAS IT

Thank you so much

I've literally been trying for an hour with no result and it was this stupid issue

I still have a little misalignment, I don't think I can fix it without resetting the position to the one before the collision, can I?

Like with a checkbox

[timid dove]

To be perfectly honest this doesn't seem like something you should be using Rigidbodies for

Too imprecise

[sharp current]

I was trying to do something like this
https://youtu.be/NpS5v_Tg4Bw?si=F1xuhiMINgO95QrN&t=208

(time included)

[sage whale]

Is there a better way that I could have a rigged character have physics, than the very clunky way active ragdolls are always suggested. The vast majority of those use two different skeletons, one just for physics, then a rigged skeleton tries to match the position

reason why I dislike that is unity bones really arent designed for pose matching, so it gets really annoying to deal with

but if you could just have a dynamic skeleton right from the very start, that seems a lot more ideal

[timid dove]

Active ragdoll is pretty niche, and only suitable for certain kinds of games. Most games would use a regular animated model and have its animations react to/get controlled by the player controller. The actual physics of the character would use a simple Capsule Collider, for example

you would use IK to make the foot touch the ground properly.

[sage whale]

well the climbing character im making, needs the rigged model, but I've been getting really stuck with the physics part

I keep trying to make a series of game objects for the parts of the body, but I stopped using an actual rigged character. It was getting really annoying dealing with it

the only real way that seems right is like this. Climber is just an empty game object, but the 3 parts of it are rigidbodies

I think im on attempt number 10 at this point to try and make the climber, so maybe the initial approach im taking is wrong

[timid dove]

I think you should focus on the physics first before worrying about the rendering

[safe reef]

Hello, has anyone noticed any undocumented 3d forces/physics changes since 6000.1.0a9?

I have made a flying self stabilizing drone on 6000.0.36f1 which uses both VelocityChange and Acceleration force modes and ever since that unity version the drone flies faster and rotates out of control, indicating that something changed which made the forces much stronger. Tested pretty much every version from6000.1.0a9 to 6000.1.1f1 and it only works correctly before a9

[sage whale]

thats fair, only reason why I'd want to work with the rigged character from the start is so I know its set up good from the very start

I worried that using a fake rig for the physics, could be really awkward when I have to move that over to working with the actual character

[timid dove]

One possibility is that your code is framerate dependent, and there's a performance improvement or regression.
Another possibility is there is some actual physics difference.

[safe reef]

I don't think it's framerate related as I appear to have the same framerate but I'll launch both versions simultaneusly and lock them to a specific framerate to test side-by-side again

can confirm it still happens

until the 13 second mark is 6000.0.48f1, after that is 6000.1.1f1

[timid dove]

show your code

and "locking the framerate" isn't really possible so i'm not sure how you can confirm these are running at the same framerate consistently

[safe reef]

well both 600fps and 120fps run the same in the earlier version and both are too fast in the newer version so..

[timid dove]

ok that's a good datapoint. What's the code look like?

[safe reef]

This is what I use for the drone to look at where it's going. Called in FixedUpdate as expected

public void RotateTowards(Vector3 target)
{
    var pos1 = target;
    var pos2 = rb.position;
    
    pos1.y = 0;
    pos2.y = 0;
    
    var targetPosition = pos1 - pos2;
    if (targetPosition.magnitude < 1f)
        return;
    
    var targetRotation = Quaternion.LookRotation(targetPosition, Vector3.up);
    
    var deltaRotation = targetRotation * Quaternion.Inverse(rb.rotation);
    deltaRotation.ToAngleAxis(out var angle, out var axis);
    
    if (angle > 180f)
        angle -= 360f;

    if (Mathf.Approximately(angle, 0)) 
        return;
    
    angle *= Mathf.Deg2Rad;

    var torque = axis * angle;
    rb.AddTorque(torque * RotateSpeed, ForceMode.Acceleration);
}

[timid dove]

silly question but is the time scale or fixed time set differently on the different projects?

[safe reef]

unless the engine upgrade changes them I don't think so, as I've just copied it over and upgraded it

can check again

[timid dove]

another thing to check is make sure the object has the same mass and same intertia tensor

and make sure the script hasn't been duplicated or something silly (two copies on the same object)

[safe reef]

both are the same as expected

well.. that was multiple hours of reinstalling and debugging 🤦‍♂️

[timid dove]

different damping?

oof

[safe reef]

for some reason 6.1 does not have the overrides that exist in 6.0? Maybe related to the properties being renamed?

the code is the same

[timid dove]

which overrides

oh

prefab overrides?

[timid dove]

interesting - yes probably that's why

because the property names changed - but that's a poor user experience !

Maybe because 6.1 is alpha still

I would report ithat as a bug if you have a chance - that drag and angular drag don't get migrated properly

[safe reef]

it happens with the non-alpha version as well, next to the lts

where would I go around reporting this?
as I am sure someone else will definitely get stuck on debugging such issue

[timid dove]

I think it's still considered Beta, though it seems the hub is not labelling it as such?
https://discussions.unity.com/t/unity-6-1-beta-is-now-available/1580714

[timid dove]

In the regular bug reporter

or on Discussions.unity.com

[safe reef]

will look into it, thanks for your help

[timid dove]

thanks for showing me something to look out for!

[safe reef]

gonna have to go around reapplying values for all my prefabs now as I'm making my game use more physics objects where I can (kind of like what the half life series did)

[trail helm]

hi guys, i wanted to ask : how do you handle 2d top down collisions that stop the player, esp for moving NPCs ?

I tried different methods and ended up using box raycasts and checking the distance between the closest contact point and the collider's point closest to it.

It works fine but it seems like a convoluted way to make something that is a basic for a lot of games.

[timid dove]

Just basic Rigidbody2D with colliders and moving via the Rigidbody2D

[trail helm]

I tried it but to stop the player i had to make the body dynamic. And i don't want the player to be pushed by NPCs, i don't think it's a common thing in 2d top down rpgs (forgot to specifiy mb)

[timid dove]

Yes of course it needs to be dynamic.

Kinematic bodies are "unstoppable forces"

[trail helm]

and how do you deal with your player being pushed around by moving objects in your project ? or is it fine for you ?

[timid dove]

Depends on the project but It's not usually a problem.

[trail helm]

oh ok, thanks i'll look a bit more into that

[inner thistle]

What do you want to happen when the player is on an NPC's path? If the NPC should just go through then you can use trigger colliders and prevent player movement when inside the trigger. If the NPC should stop as well then you can stop both on collision

[trail helm]

i want both the player and the npc to stop. I did stop them on collision, but then they were stuck. I tried to move them to a previous safe position but it didn't work either (cannot explain why tbh)

[sage whale]

  void StabliseTorso(float strength = 0.1f)
  {
    Vector2 target = -Vector2.up;
    Vector2 current = transform.up;

    float angleDifference = Vector2.SignedAngle(current, target);
    float torqueAmount = -angleDifference * strength;
    _rb.AddTorque(transform.forward * torqueAmount);
  }```is there a better way to keep a rigidbody in an upright position? this sort of works, but it oscillates forever unless I crank the angular damping up

I just want it to try and maintain the upwards direction. I get why it oscillates, once its too far to to the left it rotates but then it overshoots to the right, and that repeats

ive had this issue in the past, my only solution has been to reduce the torque to 0 once the body is actually aiming upwards. But it never gives very nice results

[timid dove]

Just constrain the rotation in the inspector

[sage whale]

that totally locks it from rotating, I still need it to be allowed to rotate, it just has to return to the position

[timid dove]

What's the gameplay you're trying to achieve

You need a PID controller if you want to do this properly

The thing you're doing now is too simplistic

It would need to add a reduced force when closer to the desired rotation

[sage whale]

the yellow box will be the torso of the climber, so I need to make sure they always try to keep the body with their head at the top

some rotation is allowed, I cant remove all torque like the constraint setting does

ill look into a PID controller

[honest river]

When a rigid body moves fast, it can jump over an edge collider and go into an area where it's not supposed to. What's the way of preventing objects going out of the edge collider?

[timid dove]

Use continuous collision detection

Also consider using polygon colliders instead of edge colliders

[honest river]

I'd like to contain objects in an area, like a an area with fence around. The fence is comples, so putting 4 box colliders wouldn't work. How would I do this then with not the edge collider?

From what you just told me about continuous collision detection, looks like using continuous collision detection is the correct way to do this?

[timid dove]

What does "the fence is comples" mean?

Yes continuous collision detection is a correct way to do this

[honest river]

Complex

[timid dove]

Oh - sure it can be done with a polygon collider or many box colliders then

Imagine an edge collider but with some thickness

You'll want continuous collision detection either way

[humble plaza]

Strange bug of sorts: This is a spider controlled by IK limb movers. The blue dots represent the targets for the spider's legs to take steps to after a certain distance. When walking on a white colored surface (default sprites), the dots are able to move on them. However, when walking on a tilemap (gray area), the dots ignore it, despite the tilemap having a collider and the necessary physics layer.

https://media.discordapp.net/attachments/493511037421879316/1370703093817282570/2dPlatformPrototype_-_testLevel_-_Windows_Mac_Linux_-_Unity_6_6000.0.30f1___DX11__2025-05-10_12-59-16.mp4?ex=6820763b&is=681f24bb&hm=e69cfcebd960eeea1ab87001d3f68e0eb2b1cf0c1f7c3897604aa5776184286a&

This function sets the position of the dots:

    {
        RaycastHit2D hit = playerControllerFunctions.castRay(bodyTarget.position, Vector2.down, pb.groundRayLength, Color.red, pb.level);
        if(hit.collider != null){
            Vector2 point=hit.point;
            point.y+=pb.bodyTargetYOffset;
            bodyTarget.position=point;
        } 
    } ```

[timid dove]

Show the collider Gizmo for the tilemap

[timid dove]

Where's the collider? You all the important things off this screenshot

[humble plaza]

I somehow fixed it

I just assigned "geometry type" as polygon

[timid dove]

I was going to suggest that yes

[humble plaza]

Thanks i guess lmao

[humble plaza]

@timid dove sorry for the ping but a similar problem is still bothering me: Now, the dots dont collide with the edge collider of a sprite shape

[wispy iron]

is there some way to integrate unity physics with gameobjects? right now im planning on a hybrid ecs game and for most objects i kinda just need a simple rigidbody

[tardy rune]

Hi I currently have a weird Unity physics problem with the object grabbing joint. It works fine until I turn off the collider(s) of the object I'm holding, then it starts spinning around for some reason.
This is a problem because I want to turn off the colliders with a script that will check if the object is teleported inside of something when the hand grabs it, so it doesn't freak out when held, but turning off the colliders apparently does the opposite of helping.

How the system is set up:
The hands are connected to the body with a configurable joint where the target position is set to the position of the controllers.
The hands and object(gun in this case) have their own rigidbodies and colliders.
When the hand grabs an object, a fixed joint is created between the hand and object (see end of video for how it's configured)

For some reason if the colliders of the object are turned off it starts freaking out. Why does this happen? And how can I fix this??

[sage whale]

I cant figure out a proper way to move the hands of my climber around. I need their position to follow the mouse, but nothing seems to work all that well.
In the video, the hand is moved like this

  // stop the target (mouse) moving further than the length of the arm
  Vector2 point = ClampWithinCircle(target, _shoulder.position, 2f);
  
  _handRB.MovePosition(point);```This makes the hands movement feel responsive (it matches the mouse position), but you can move the mouse up very fast and it propels the whole climber up.

[coral mango]

Just limit the speed the point changes at?

[sage whale]

if I did that, then it'll feel like the hands are lagging behind the mouse position

its what I was doing in a previous attempt

Vector2 dir = _target - _rb.position;
Vector2 vel = -_rb.linearVelocity;
Vector2 force = (stiffness * dir) + (damping * vel);
force = Vector2.ClampMagnitude(force, 1f);
_rb.AddForce(force);```

that also created the same problem where you could fly upwards

[coral mango]

I mean, like just use Vector2.MoveTowards when changing the point

[sage whale]

ah, I get you

I'll see what that does

[coral mango]

It should effectively filter out too-fast mouse moves.

[sage whale]

  void MovePosition(ref Rigidbody2D rb, Vector2 pos)
  {
    Vector2 current = rb.position;
    Vector2 pnt = ClampWithinCircle(pos, _shoulder.position, 2f);
    rb.MovePosition(Vector2.MoveTowards(current, pnt, Time.fixedDeltaTime));
  }```is this what you mean?

those fast movements are gone, but modifying the point like this makes it very laggy

https://youtu.be/S-4XZgARAuA?t=437 watching the hands of a real climber, I cant determine how I'd replicate the action of moving them around

quickly moving the hand up does cause their shoulder to be pulled in that direction, but nothing close to mine

I think the issue is that rb.MovePosition pushes the hand in some direction, which results in the shoulder and torso also being pulled towards the hand. So you get this

[tranquil crown]

I have a question about AutoSyncTransform option in Physics2D. In play mode, I'm moving an object with 2D collider with dotween and I've noticed the collider is not synced with the game object (the gizmos in scene stays in the same place, if I'm using raycast to detect if object is clicked by mouse, raycast returns collider as null even though position is synced). If this AutoSyncTransform is enabled or I'm testing in build, collider is synced and everything works fine. So my questions is, regarding 2D development, should this option be enabled to debug in Editor? I'm kinda confused if this is the normal behavior (to not sync collider with moving object if there is no rb) unless I enable this option or there is something else may be causing it?

[timid dove]

how are you moving the object with DOTween exactly?

I think ideally you should be calling DOMove on the Rigidbody2D of the object, not its Transform

[tranquil crown]

using objectToMove.transform.DOLocalJump

[timid dove]

yeah that'd be why

move it with the Rigidbody and you'll have less trouble

you should pretty much never move any physics object via the Transform

there's even a DOJump for Rigidbody2D

[tranquil crown]

oh great thank you so much for the clarification

[lament oxide]

!code

[flint portal]

Posting code

📃 Large Code Blocks

Use links to services like:
https://paste.mod.gg/, https://hastebin.skyra.pw/, https://paste.ofcode.org/, https://paste.myst.rs/, https://scriptbin.xyz/

📃 Inline Code

Surround code with three backquotes. Not quotation marks.
To format as C#, add cs to the first line:
```cs
// Your code here
```
Add a comment with a line number if there is an error message.

[sage whale]

I feel like its a problem that the only way I can think of to get a climbing characters hand that controls properly, is to try and model muscle forces to get the torque needed so the arm can be moved around

i know this is probably far too advanced than it would need to be

I just feel like having an external force to move the hand, that force is going to pull the body along with it, this seems unavoidable
but if parts of the arm itself rotates, that can move the hand to where it needs to be

[proud sky]

Hi, I am trying to detect entry AND exit points on a collider using RaycastCommand. The QueryParameters provide me with the hitBackfaces and hitMultipleFaces which sounds like what I need, but seems to only apply to MeshCollider triangle faces. Is there a way to get the exit point of a jobified ray cast?

I specifically need it for sphere and capsule colliders

[timid dove]

Would it be sufficient for you to do two raycasts - one in the opposite direction as the original to catch the backfaces?

[proud sky]

I thought of that, but since these are analytic shapes I was hoping the back face flag would "just work". I guess not 🤷‍♂️

[timid dove]

Alternatively, once you have all the "front face" hits - you no longer have much use for the spatial partitioning acceleration that raycast benefits from and you could figure out where the backface hits will be analytically, since capsules and spheres are quite well defined and understood mathematically.

You already know which spheres and capsules were hit and the "exit wounds" could be calculated from the RaycastHit information

[proud sky]

If I have to redo the intersection tests I should just not use Unity at all. Thanks for the suggestions though 🙂

[timid dove]

Well half of that magic is the spatial partitioning not just the individual intersection testing but I get ya

[golden island]

Hi I’m using unity physics whats the easiest way to not still have upwards momentum when walking off of the top of a ramp (stairs)

[bleak umbra]

You would track a grounded state of your controller and always snap it to the ground unless it has exited the grounded state via jump or fall.

[golden island]

Sounds expensive

Can’t just snap feet to the floor since that would result in parts of the physics shape being inside terrain when moving up a ramp for example

Don’t really want to do a shape cast every frame

[timid dove]

Not really, just one Raycast or CapsuleCsst per frame. Anyway you wouldn't need to snap anything just set y velocity to 0 on the first frame you become ungrounded

Aren't you already doing a grounded check anyway?

[tardy rune]

Hi, does anyone know how I can make this slider stop vibrating? I tried messing with the values already but when I do find some force/damper values that make it stop vibrating, it becomes very weak and/or makes it move at a very slow speed when I let go of the slider.

[timid dove]

Is it really necessary to have a fully simulated physical slider on the gun?

with a joint and everything

it's probably better to animate this with code. The physics engine isn't built for precise mechanical precision like this

At the very least you should look into Articulation Bodies and Prismatic Joints for this particular mechanism.

[tardy rune]

It's for a physics based VR game, so you need to be able to grab it and move it around, I'll look into those things you mentioned

Idk how those would be used, why not do this? Is there no way to fix the current joint?

[timid dove]

prismatic joints/articulation bodies are designed for mechanical simulations with higher precision

Rigidbodies aare just not precise enough

I think the easiest way would be to avoid physics entirely here though

and just do it with code

That would give the best result

[tardy rune]

My current grab scripts all work through rigidbodies and joints, so that would be too much to make work. I'll just stick with the decent values for now.

[hidden panther]

I noticed that all OnCollision and OnTrigger callbacks can be converted to Coroutines but I can't seem to make them work. For example i was trying to make a script that only calls OnTriggerStay a fixed number of times per second instead of every physics frame, but I was unsuccessful. Is there any special way to write the implementation to achieve this result?

[timid dove]

OnTriggerStay definitely can't be a coroutine

Pretty sure only OnTriggerEnter can

And trying to run OnTriggerStay at some different frequency is extremely sus, that's not what making it a coroutine would achieve

All you can do with that coroutine feature is have a cute little shortcut that has the same effect as just calling StartCoroutine inside the method as it runs normally

[hidden panther]

Mmm i was looking at the documentation and it says this:

OnTriggerStay can be a co-routine, simply use the yield statement in the function.

Maybe I misunderstood what it actually means

[timid dove]

Extremely poorly documented

But maybe if can be I guess

It means you also need to use IEnumerator as the return type

And then it acts like a normal coroutine

It will still also be called every physics frame

You can't change that

And you'd essentially be starting a new coroutine every physics frame that way

I think what you actually want is to start a coroutine on OnTriggerEnter and stop it in OnTriggerExit

[hidden panther]

Not the best idea then, that's why despite having a yield return _myWaitForSeconds; it still executed the following logic every frame

[timid dove]

Yes it's going to start the coroutine every time OTS would run

To be perfectly honest, OnTriggerStay is almost entirely useless

There's nothing you can do with it that can't be done with OnTriggerEnter/Exit

[hidden panther]

Understood, thanks for clearing that!

[wispy hemlock]

Hi all,

I'm having a strange issue that I can't seem to figure out.

I'm trying to put together a very simple Jenga game, but I'm stumbling at the first hurdle.

I have my blocks set up, all with rigidbodies/box colliders. But I'm getting massive amounts of overlap/intersection on the box colliders and I really don't know why.

Would anyone have any ideas/pointers please? (Using Unity 6.1)

[short lava]

https://cdn.discordapp.com/attachments/748796358332383262/1373675337464156161/My_project_10_-_SampleScene_-_Windows_Mac_Linux_-_Unity_6_6000.0.29f1__DX11__2025-05-18_18-47-28.mp4?ex=682b465a&is=6829f4da&hm=fb21223ae5bbdd5a92e7c397f734d8d2045388e3c15e98ac57d07282770554c0& how do i make constraint tank threads?

[slender bison]

hi I'm using unity 6.0 and building a 2d topdown rpg, following problem: i have a ground layer and over that a water layer and over that i have a bridge layer now i want the player to be able to walk over the bridge without running over or jump into the water. the water tiles has sprite collider and all 3 has tilemap collider set to merge rigidbody as kinematic and compostite collider polygons. the player itself hast a box collider and a rigidbody dynamic. i tried layer collision matrix but it seems i cant figure out whats wrong because i cant walk over water or i still bumb into water under the bridge. bridge tiles has no collider set.

if u need adittional info i can provide them

[timid dove]

You should give the bridge tilemap a collider and set its Composite Operation to "Difference"

[slender bison]

done but still crashing in the water under the bridge

this are my collision matrix

water tilemap hast tilemap collider (merge), rigidbody (kinematic) adnd compostie collider
Bridge tilemap has tilemap collider, rigidbody (kinematic) and composite collider

each tilemap is set to the correct layer

ohh and player is set to the player layer

[timid dove]

wait you have three different composites

then the merge/diff interaction isn't going to happen

I was implying they should all be sharing one composite

and you don't need to do anything with the layer collision matrix

[slender bison]

ok so just remove evry other composite exept for 1 ?

[timid dove]

the composite needs to be on a parent object of all the tilemaps

[slender bison]

ohh i understand now i think let me try then i report back ^^

[timid dove]

Basically the composite makes a composite of all its child colliders

[slender bison]

ok sry no i dont know how i would create a parent composite

if i click in hierarchy i can create one

this is my scene

evry tilemap is in the same grid

ohh i can add a composite to the grid itself

well i still cant walk over the bridge

and then sometimes i can walk over evrything o.O

if it would help i offer also the possibility of a video call so i can share my screen and u can see evrything live

[slender bison]

can rly noone help i just dont get it whta i do wrong

[slender bison]

found my issue but thanks

[paper dirge]

I have added box colliders on all,
the gripping boxes are articulation bodies and continuous dynamic
the object is normal rigidbody without gravity and continuous dynamic
how do i keep it gripped after the robot starts moving??

[digital marlin]

Hey folks. I've been stumpted on this for way too long. I'm hoping that somebody here can set me in the right direction. Maybe there's some obvious answer that I've been missing (that's always the hope, isn't it?)

For context, my game is a top-down, turn-based space-shooter with free movement (not grid-based). Some projectiles explode. My explosion algorithm has worked exactly as intended until I recently found a massive problem with it. Here's how it works:

1. Explosive object hits something, and it is stopped before an explosion object (child) is turned on and Explode() is called on it.

2. The Explode function does a Physics2D.OverlapCircleAll to grab all of the potential hits.

3. An initial raycast check is done directly from the explosion to the potential hit. If it reaches the target, it is considered a confirmed hit, and it is damaged and knocked away.

4. If the initial raycast misses, it could be because the origin point was behind cover, but some other part of the ship is exposed enough that it should be considered a hit. To catch this, a series of raycasts are fired from the explosion in 5 degree increments around it. If it hits, the loop exits, of course, as the target is considered hit.

The problem occurs with point-blank shots. Often, the point of the explosion will be inside the collider if either the firing ship or the ship/object I'm pushing up against. This, unsurprisingly, means that only that one object will be damaged. I can't even temporarily turn off the colliders of either the firing ship or the hit object because either one could be legitimately blocking other objects. I tried adding a bit of recoil to the firing ship so that it moves away a little bit first, but due to the timing, this doesn't always work either. I could implement a short delay to give the recoil time to move the ship back before the missile fires, but I suspect that it wouldn't look/feel right. I don't really want missiles to have recoil anyway.

Any help would be greatly appreciated.

[timid dove]

I'm not sure I follow why only one object is damaged

[digital marlin]

It's due to the raycasts starting inside of either the firing ship's collider or the other object's collider. For example, if I'm up close against an asteroid, the explosion may spawn inside of the asteroid. The asteroid takes damage, but the firing ship doesn't because every raycast check only reaches the asteroid.

[digital marlin]

I think I solved it. I just made sure that the missile is kinematic with an enabled, non-trigger collider for one physics step before doing the target-checking stuff for the explosion. This lets the ship and/or other object to pop away slightly, which doesn't look weird because the explosions push immediately follows.

Good ole rubber duck programming, eh? Neglect the project for weeks because I don't want to bug people for help... make a post, and then figure it out the next day. 🦆

[grave spindle]

does the physics debugger show cast commands ?

im trying to debug why my sphere cast commands arent returning anything after migrating from OverlapSphereCast

[timid dove]

Yes, under Queries

[grave spindle]

i dont see them (im using "show all" queries)

i switched to overlap sphere command, same result

[vivid ivy]

Does anyone know of a way to get an effect similar to physics interp, but for articulation bodies?

[vivid ivy]

I'm asking cause it's pretty distracting to have the birdie jitter

Activating physics interp on a rigidbody fixes this

But the brid aint a rigid body :/

(excuse my breathing)

[timid dove]

Some people have written their own interpolation for them:

https://discussions.unity.com/t/interpolation-for-articulation-bodies/918497/8

[wary girder]

Hey folks. I’m looking for some efficient way to detect the first time a rigidbody has become awake. This is so I can know which rigidbodies in a scene have changed, and therefore need to have their data saved (as part of a saved game file).

I’m hoping to avoid saving all rigidbody and transform data for every rigidbody in the scene, since the player might only interact with a fraction of them while playing.

As far as I can tell, there’s no ‘OnAwake’ callback for rigidbodies. That seems like it would be ideal - bummer.

Unfortunately, ‘OnCollisionEnter’ doesn’t cover enough cases to work for this. It’s possible for a rigidbody to wake up without that event being called.

[soft merlin]

Making a 2D pool game and having an issue trying to make the guidelines. I am using CircleCastAll to detect where the white ball will be at the point of collision, but when I use OnCollisionEnter2D it gives me a slightly different point. In the pic, the white circle with the little white dot in the middle is where the predicted center is, and the gray circle is where the collision actually occurs. Not sure if its just an issue with how CircleCastAll is calculated compared to OnCollisionEnter and if there is something I can do to make it more accurate

[timid dove]

Are you using continuous collision detection?

[soft merlin]

Yeah, I've put it down to CircleCast and OnCollisionEnter both detecting things at different rates and went for a method that didn't use circlecast to get more accurate results

[torn zealot]

I'm confused, what white circle with a white dot? Which of the gray circles? Can you use other colors than just 2 so it's easier to see what's going on?
And what are you detecting collision with? Where did the ball come from, the thin white line?

[soft merlin]

Yeah my bad. The thick white line is the guideline. The horizontal line is the path the white ball is travelling, and the diagonal white line is where the black ball was predicted to travel after collision. The (only) grey circle near the elbow of the guideline is spawned on the white ball position where collision occurs, and the white circle with the dot (is the one that surrounds the elbow of the guideline) indicates where it was predicted to occur from the CircleCastAll.

Instead of using CircleCast I wrote a script that detects intersections along the line you are aiming by looping over the positions of all stored balls. Ended up being a lot more precise than using CircleCast

[chilly prawn]

Hello all!

I have a quick question, I hope this is the right place for it.

I am making a horse in unity and I am trying to setup colliders, ideally I want to avoid using primitives but this leaves me with mesh colliders which are not supported (if non-convex) for rigidbodies

how should I approach the colliders for something like this?

[unique cave]

What do you need the collides for? Generally primitives like capsules are great choice for skinned meshes

[severe moth]

You would approach it by using primitives

[broken stream]

Should I expect that

{
    for (int i = 0; i < 10; i++)
    {
        do physics * physicsTimestep
    }
}```
will accurately predict
```void FixedUpdate()
{
    do physics * physicsTimestep   
}```
?

[timid dove]

Can you elaborate? It's not clear what you mean.

"do physics" is pretty vague.

[broken stream]

A list of objects updating their position and velocity:

{
    foreach (var body in bodies)
    {
        if (body.active) body.rigidbody.position += body.velocity * physicsTimestep;
    }
}

private void UpdateVelocity(List<PhysicsBody> bodies, float physicsTimestep)
{
    foreach (var body in bodies)
    {
        if (body.active) body.velocity += GetGravity(body, bodies) * physicsTimestep; // maybe is bad
    }
}```

called in this function private void FixedUpdate() { PhysicsStep(bodies); }

[timid dove]

They would be equivalent assuming nothing ever collides with anything.

The difference here is that between each FixedUpdate you will get a physics simulation step

What you really probably want to do instead of this is actually just to call Physics.Simulate()

[broken stream]

Its for drawing / predicting trajectory lines in a orbital mechanics game using Newton's equation. I'm fully simulating each physics body in a trajectory manager and they all run beside each other, the accuracy seems off however.

[timid dove]

You're not accounting for gravity, drag, collisions, angular velocity etc.

What you can do is copy the objects to a secondary physics scene and simulate it with PhysicsScene.Simulate

If you're not actually using Rigidbodies/ the built in physics engine then there's no reason it should be different unless you are calling different code or doing other things in between

[broken stream]

Hmm, yeah the entire physics system is most detached from the built in physics but I'm still getting slightly different results.

[timid dove]

Then your code is simply doing something different in each case

How are you doing a trajectory prediction without affecting the "original" objects?

[broken stream]

Each GameObject that is being managed by the physics system has duplicated version of itself with only my custom physics component, in a separate prediction manager with the for loop. I think I did figure out the accuracy issue though at extreme performance cost.

The line did not have enough points so the inaccuracy was merely an illusion.

[bleak siren]

Hi, i am trying to make a Joystick to be moved with the player's hand positions in VR, i'm using a combination of a Configurable Joint and a script adding Torque to the Joystick's Rigid Body to move it towards the hand when grabbed, it works well enough when the hand pulls it away, but when at the center positions while grabbed, the Joystick keeps wobbling around and never stays still where the hand is, i've tried changing the Torque multiplier on the script and the Spring and Damper on everything of the Configurable Joint, but nothing works, any ideas?

[bleak siren]

For now, what i can do is make it as little wobbly as possible by reducing the Drive springs and increasing the damper while grabbed, while reversing back to original values when released so it can go back to its default position faster

[timid dove]

I feel like using actual Rigidbody physics is kind of overkill for this, no?

[bleak siren]

What do you mean?

[timid dove]

I mean I would just let it be grabbed and freely manipulated, and when the player lets go, pretty much just lerp it towards the upright position in code.

[stray belfry]

Issue: the object is bouncing infinitely (vibrating).

Physics material bounciness is on 0.5 (at time of recording)
Code only gives a start speed

setting rb to continues has mitigated the amount of times this happens, but it still does happen

same for drag, helps a little, but i dont want to rely on drag, its not the physics i want

[simple hearth]

Raycast behaves a little bit strange in this case.. Same angle, same origin. When I aim at the corner of the object, sometimes it detects collision, sometimes it does not. Any thoughts?

public GameObject ObjectOnFocus(LayerMask layerMask)
{
  RaycastHit hit;
  if (Physics.Raycast(transform.position, transform.forward, out hit, grabDistance, layerMask))
  {
     if (hit.rigidbody != null)
     {
        return hit.rigidbody.gameObject;
     }
  }
            
  return null;
}

Transform is the cam in this case

[timid dove]

You need to add logs to your code

Log which object it's hitting, if any

And don't miss any branch paths

[simple hearth]

hmm.. I launched the project and tested again with logs, this time I couldn't replicate the issue. Probably I either changed something that fixed the problem, or some weird editor bug happened and I needed to restart for it to get fixed.

[worldly spruce]

What is the go-to approach for handling player movement relative to another moving object the player is ON, i.e. a moving platform or a ship?

(for the sake of simplicity Im not doing groundchecks yet, not doing gravity, nothing. I just have a player that stays on the ship. the ship can move around, the player can move around on the ship, but never leave it)

CharacterController goes into a bin because it doesnt work with moving objects very well. We have rigidbodies.
Ive tried juggling Rigidbodies around and Ive got a semi-okay result, the player doesnt jitter, doesnt fall off, it can move and collide with the ship as it swims around.

The problem comes from Rigidbody interpolation: with 'Iterpolate' on the player juuuust slightly lags behind a moving ship and catches up when it stops. with 'Extrapolate' on the player outruns the ship by a slight amount and then falls in place when the ship stops.
I thought interpolate and extrapolate were just the methods which, uuuh, handle character's smooth movement between fixedUpdate cycles to sync with the Update?

I could share the code, but the calculations are correct, otherwise the guy wouldve fallen off the ship:
My ship script has a method that calculates its predicted position and through world-local transformations gives the player script correct vector of "how much it should move in the next frame to match the ship movement". My player calls this method when calculating its own movement. Ive made it so that the ship calculates its predicted movement twice - once for itself and once for the player JUST to account for the script execution order.

Either Im missing something, or there IS no way to eradicate this micro-lag, in which case Im screwed. Does anyone have any ideas about it?

[timid dove]

This handles that well: https://assetstore.unity.com/packages/tools/physics/kinematic-character-controller-99131

[worldly spruce]

I'll take a look, thank you!

although I assume this one doesnt deal with rigidbodies altogether and uses its own collision logic. damnit. I hoped I could avoid that, but maybe not. HNNNNNNNG

[timid dove]

It kinda depends on what your requirements are but another option for vehicle physics are to use one scene for the vehicle and the outside world, and a secondary physics scene for the things inside the vehicle

[worldly spruce]

Using... secondary physics scene? Could you elaborate a bit? I don't think I've ever heard something like that in the context of Unity 👀

[timid dove]

https://docs.unity3d.com/6000.1/Documentation/Manual/physics-multi-scene.html

[worldly spruce]

oh. oh dang. thank you!

[worldly spruce]

how do you people do with profanity? I have a story to tell

[lime flint]

Hi. I have a pressure plate which works by spring joint, it basicly consist of 2 object (colliders and rigidbodies are attached to both object) and when i put an object on the pressure plate the upper part of the pressure plate gets closer to the lower part of the object and it triggers and when i take object back the upper part gets distance from the lower part.

Now the problem is really interesting. As i mentioned i have a pressure plate prefab and im using it at various parts of my level. The problem is some prefabs works very intersting like the upper part is sliding like its on an ice but when i change the corrupted prefab's world position it fixes (the world position is not an enormous number, it is just -200 or smthng) also if i remove the pressure plate from the parent object it fixes again (the parent object is just an empty object which scale is 1). I thing its an really interesting physics bug. Does anyone knows why it that?

[lime flint]

Also im using unity 6000.0.32f1 version

[timid dove]

I wouldn't bother with spring joints for a pressure plate. Way too finicky. Just use a simple trigger collider on top and animate the plate going up/down in code or with an animator

[lime flint]

My game based on completly physics. Like you can scale an object and it gets hevaier so it triggers the plate also the player may but more than one object on the pressure plate so it can be triggered with 2 object without scaling them so i need to use joint.

[timid dove]

Despite that I would probably still avoid using physics for the pressure plate

do whatever you need to do like use a trigger and just manually add up all the object weights and decide if it should press the plate or not

games are all about smoke and mirrors.

[mild rain]

is this channel still ok for ECS physics or should I make a #1062393052863414313 thread?

[timid dove]

Either is probably valid. You would probably get better answers in #1062393052863414313 though

[lime flint]

thx ill consider it

[lime flint]

For the rest of ppl who is facing with same bug i solved it by moving the prefab out of the parent object, i mean if the prefab has no parent this bug does not occurs idk why

[fiery chasm]

need a bit of help with raycast, first time experimenting with it, just doesnt work really, ive used drawray and it should be colliding, literally just trying to get it to collide with anything and printing a message if it does and it just doesnt work :/ are there common setup/settings things to tweak first?

[timid dove]

Care to share your code and screenshots?

99% chance you just did something incorrectly

[fiery chasm]

ill get the code, when it comes to screenshots its basically an empty scene, two characters and a few tiles in the background, what screenshots would be helpful?

[timid dove]

• a screenshot of the isnpector of the object you expect to be hitting with the raycast
• a screenshot of the drawray result in the scene

The code and the inspector are the most important though

[fiery chasm]

!code

[flint portal]

Posting code

📃 Large Code Blocks

Use links to services like:
https://paste.mod.gg/, https://hastebin.skyra.pw/, https://paste.ofcode.org/, https://paste.myst.rs/

📃 Inline Code

Surround code with three backquotes. Not quotation marks.
To format as C#, add cs to the first line:
```cs
// Your code here
```
Add a comment with a line number if there is an error message.

[fiery chasm]

using UnityEngine;

public class EnnemySight : MonoBehaviour
{
    public int offset;
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        Debug.DrawRay(transform.position + transform.right * offset, transform.right * 100, Color.red);
        if (Physics.Raycast(transform.position + transform.right * offset, transform.right, out RaycastHit hit, 1000.0f))
        {
            Debug.Log(hit.collider.gameObject.name);
            {
                if (hit.collider.CompareTag("Player")) { Debug.Log("player detected");}
            }
        }
    }
}

[timid dove]

Ok now a screenshot of the player object's inspector?

[timid dove]

Ok you're going to kick yourself

you're using a 3D raycast

but your game is using 2D physics components

You need to use Physics2D.Raycast

It has slightly different syntax so you should check the docs for examples.

[fiery chasm]

omg 🤦‍♂️

its 1 am and its been 2hours of troubleshooting, i knew itd be something stupid like that

tysm

[hard crow]

hey guys, sorry for the long doubt coming up, but, im on my first game project with unity and c# that im trying to do on my own (well its still 90% tutorials but hey), and so im trying to make this space invaders game to practice and i had my first encounter with 2D bullet projectiles, and so the bullets are succesfully spawning in the correct place whenever LMB is clicked, but for some reason the bullets are not moving upwards even though i crosschecked with some tutorials and its the same code that they have implemented as mine, ill attach the screenshot for the bullet script (attached to the bullet prefab)

public class bulletScript : MonoBehaviour

{
    public Rigidbody2D rb;
    public float bulletSpeed = 5f;
    void Start()
    {
        rb.linearVelocity = Vector3.up * bulletSpeed;
    }
}```

and this is the script for the gun if it helps with debugging

```using UnityEngine;

public class gunScript : MonoBehaviour
{
    public Transform firePoint;
    public GameObject bulletPrefab;

    public float bulletSpeed = 5;
    void Update()
    {
        if (Input.GetButtonDown("Fire1"))
        {
            shoot();
        }
    }

    void FixedUpdate()
    {
        
    }

    void shoot()
    {
        Instantiate(bulletPrefab, firePoint.position, Quaternion.identity);
    }
}

[inner thistle]

Show the inspector of the bullet prefab

[timid dove]

Do you see anything in the console, such as errors when you run this code?

[inner thistle]

The rigidbody is effectively disabled

[timid dove]

ah good catch

[hard crow]

oh, i totally ignored that message, i thought that wasnt anything important

thank you guys!

its working now

[shy hare]

does anyone know a solve for physics pulling configurable joints apart? I'd love for these to maintain their relative positions at all cost, but in this clip you can see me changing the weight of the joint at the end. as it increases, it pulls the chain segments apart

these are my settings for the responsible joints. They're connected to a kinematic rigidbody to anchor to the parent object

I'm trying to increase the weight of the end of this pendulum to give it a more lively feel, but when I do that, the segments start tearing apart

[severe moth]

Have you tried setting x,y,z motion to locked?

[nocturne obsidian]

Hi, is it possible to simulate both PhysX and Unity Physics at the same time? Ive found trying to simualte both freezes PhysX.
it sets Physics.simulationMode to Script

[stray belfry]

why is the rat getting some random rb speeds, rb says speed is going from -9 to 9, yet we see the rat is stationary, i have no scripts on it that affect movement, just a script that flips it based on rb velocity

[stray belfry]

nvm i just had to set a small velocity check for the flip script

[tardy rune]

Hi everyone, I had an issue before with a physics based slider joint and I have now changed it to a code based one. It now kinda works how I want it to, but it still has some weird issues.
When I shake the gun with the slider, and freeFloating = false, it visually stays in the same position like I want it to, but somehow it does trigger the reload, and that is only supposed to happen when the slider is pulled back. So is the slider somehow moving in between updates??

[autumn hornet]

Tried Chatgpt but it fails at giving me responses that work

[ebon lily]

Hi, im experimenting with a 2D stacker game where the player is a sausage and collects other sausages to grow a tower. The problem im facing is the sausages randomly offset (in video). I have Hinge Joint 2D on every sausage to connect to the one below it. Anyone know what the problem is?

Code for activating sausage:

{
    GameObject prev = sausages[activeSausageCount - 1];
    GameObject next = sausages[activeSausageCount];

    // Activate next sausage
    next.SetActive(true);

    // Place the new sausage above the previous sausage 
    next.transform.position = prev.transform.position + Vector3.up * 1.2f;
    next.transform.rotation = prev.transform.rotation;

    // Enable scripts and tags
    prev.GetComponent<SausageController>().enabled = false;
    next.GetComponent<SausageController>().enabled = true;
    next.tag = "Player";
}```

[timid dove]

When does this code run?
How are you moving the objects?
How are you attaching the sausages to each other?

Generally you should never be directly modifying the Transforms for objects that have RIgidbodies. You should only work via the Rigidbody.

Also you're always placing the next sausage directly above the previous one, even if the previous one is tilted, which will definitely result in some weird offsets.

You can also simplify this code by using a SausageController[] instead of a GameObject[]

You want the green position, not the red position

[ebon lily]

Well basically, it activates when the sausage on the ground is touched by player. I attempted to move it in the script, i guess its messing up there. I already created all the sausages in a list in a parent for the sausages that activates them, hingejoint2D connected rigid body is preconfigured

its weird because it works as intended for the first one added

[forest thunder]

hey is there anyone that can guide me how to implement a sort of realistic car controller without the built in physics ?

[timid dove]

because there's no tilt on the first one. Refer to my beautiful diagram above

What you probably want is this:

Vector3 position = prev.transform.TransformPoint(Vector3.up * 1.2f);
next.transform.SetPositionAndRotation(position, prev.transform.rotation);```

[ebon lily]

oh i see, for some reason i thought adding rotation would fix it.

ok ill try it

[timid dove]

No, it just rotates but the position is wrong. See my diagram

[ebon lily]

ok now this is happening, i think the reason i added the height was to make it go on the top of the sausage, is there a better way?

[timid dove]

are the sausages scaled?

If they're scaled the code needs adjustment

[ebon lily]

yes

[timid dove]

then you need this:

Vector3 position = prev.transform.position + prev.transform.up * 1.2f;
next.transform.SetPositionAndRotation(position, prev.transform.rotation);```

[ebon lily]

thanks a lot! it seems to work, although i think the angle limits i put in place cause it to lean more to one side than the other, but ill figure it out

[tardy rune]

Anyone know why this could be happening??

[queen nebula]

Does Mesh Collider not convexted have issues with OnTrigger / OnCollision ?

i have a ring where i need it's inside to server like fighting rig, if the inside is touch something should happened.

now since when i convex it its no longer hollow i cannot use convex for that so i am not sure

The ring itself doesnt move much it starts lowered then few seconds into the game its being raised up and scaled out

what am i missing ?

what weird is the rigidBody inside it, does collide with it and cannot leave it, but no OnCollision fires .

[timid dove]

If it moves at all it has to be Convex.

[queen nebula]

Bah then what alternative is there to what i want to acomplish ?

[timid dove]

what do you want to accomplish

[queen nebula]

A ring that is collidable - prevent players from leaving it and trigger some event when its being collided with for effects.

[timid dove]

Are you sure it actually needs to move?

[queen nebula]

well i guess i could make a version of it that's already scaled and raised out without a renderer

and then just do the visuals on another ring

but would that matter ?

[timid dove]

why not just disable it

and enable it

as needed

(and yes make the renderer separate)

[queen nebula]

Well currently what i've tried is disabling the mesh collider when its not fully positioned, then when it got to its final step the collider is enabled

[timid dove]

Yeah I mean, why does the collider need to move at all? Just have it be in the "final" place at all times and disable/enabled it as needed

as for OnCollisionEnter/OnTriggerEnter executing - if that's not happening then you are likely not satisfying all the requirements for it

[queen nebula]

Ok so basically that ring is on a moving floor, basically its a game of 2 players trying to unbalance eachother that means that the floor tilts constantly, the ring is a child of that floor and titls with it.

i dont know if this counts as movement

@timid dove Will that count as movement ? considering local doesnt change ?

[timid dove]

yes of course that counts as movement

You should make sure:

• All colliders in the hierarchy are convex or primitive
• There is a Rigidbody at the root of that hierarchy
• The whole thing is only moving via methods on the Rigidbody

if you want it to work properly

To get that collider shape for a moving object you will need to build up the collider out of multiple smaller Convex or Primitive colliders.

[queen nebula]

Yea i thought about doing many small box colliders but i'd need like 50 of them seem really ugly solution

i think alternatively i could use some ugly distance from center to solve this

[forest thunder]

hey can someone guide me how to impliment this :https://nccastaff.bournemouth.ac.uk/jmacey/MastersProject/MSc12/Srisuchat/Thesis.pdf
in unity

[queen nebula]

Thanks for the help, i will try other stuff and see how it goes

[barren sapphire]

paxmod.com

[forest thunder]

anyone ?

[inner thistle]

That's an unreasonably tall order. If you run into issues doing it yourself then feel free to ask but "guide me how to implement this" is way too broad

[autumn hornet]

hey

anyone know any tutorials for setting up character with Unity cloth? There seems to be ZERO on youtube. Since years ago. And none by official Unity. And i mean characters with actual clothing not just samples of making a cloth( that doesn't go in a person's body) into a cloth with physics cause that i found a video of but it's from years ago. I already have a character and it comes with the clothing. But setting up the colliders and stuff i've tried and still the legs and stuff come out of the skirt/dress. The closest i come to any tutorial is from a video kind of demonstrating the process in VR chat related video but she was just going to quick overview, and not really explaining in detail.

[short lava]

how can i make realistic water simulation in unity 3d

[bleak umbra]

either by buying https://assetstore.unity.com/packages/package/268614 or by DIY'ing the same stuff https://docs.crest.waveharmonic.com/Manual/SystemNotes.html (there are other assets but this is the most mature one you can use as a unified water solution in an ambitious project)

if you want to have an actual simulation of volumetric water flow you can check out this asset https://assetstore.unity.com/packages/tools/physics/obi-fluid-63067 or DIY that same stuff, which again requires some reading in conference papers.

There isn't much about water/fluid sim that is unity specific besides the rendering of the actual simulation.

[short lava]

I don't wanna pay money I wanna learn and that ain't simulation, it uses ai generated water texture then displaces it based on water texture, it won't be useful for my case

I want more of fluid simulation for gun shots

[bleak umbra]

then maybe you want to watch this https://www.youtube.com/watch?v=rSKMYc1CQHE

[tardy rune]

Anyone knows??

[kind shadow]

Hey! Does anyone know how to stop my character from floating when it moves?
It spawns at y = 0, but when I move it, the Y value changes to 0.79. The character controller height looks correct (see img1), but the skinny mesh renderer (img2) dips a bit below the model at the bottom. Not sure if that’s what’s causing it.

[timid dove]

You didn't really give enough detail here but it's probably your animator.

Try disabling the animator to see if that fixes it to confirm.

[kind shadow]

Thanks! I tried disabling the Animator, but the issue still persists.
I'm still learning, so I might be missing something obvious. Is there any specific info I should provide to help identify the problem?

[timid dove]

Show it with the scene view side by side

And gizmos turned on

[timid dove]

Set your tool handle position to Pivot, not Center

And activate the Move Tool

Then take the same video

[timid dove]

Looks ok I think. It's not .79 it's.079 and it's because your CC has a skin width of 0.08

[kind shadow]

Ohhh that was it. When I changed it to 0, the floating problem was gone.
tysm for pointing that out!! Really appreciate the help 🙏

[versed brook]

Hello everyone. I have a system similar to the one in the video. When a force is applied to the black platform, the mechanism rotates around its center, just like in the video. What I want is for the player to move with the platform when standing on it while not moving themselves.

Since this involves a physics system, making the player a child of the platform didn’t work (I learned that this approach isn’t functional). I also tried taking the platform’s velocity and assigning it to the player’s velocity, but that didn’t work either. Honestly, I couldn’t find any other solutions online. Most tutorials cover platforms moved via Lerp in code, but mine moves completely freely, using its own weight, applied forces, etc.

When I add other non-input objects, they stay properly on the platform and move with it. Only the player (which has input) behaves this way.

I don’t have a specific script to share because my last approach with velocity didn't work and all the script is messed up. If there is another way to achieve that behavior, I would like to hear that Thanks in advance!

[hot garnet]

Hey everyone. I was wondering if anyone could help me with this physics issue ive been having. I'm trying to make my golf ball have "spin" to it, such that it will quickly roll in a direction after it lands. For example backspin would roll the ball backwards quickly after it lands and settles. My problem is that when the ball lands after its initial bounce, the rotation briefly janks out / corrects itself for about 1 second before settling into a backspin (see the video). Does anyone know what I'm doing wrong here?

[timid dove]

I would really not try to use actual spinning to simulate that.

[hot garnet]

    void BackSpin()
    {
        if (spinTime < 0f) return;

        float curSpinAmount = math.lerp(0, rollBackForce, spinTime / maxSpinTime);
        Debug.Log(curSpinAmount + "cur spin amount");
        rb.AddTorque(targetSpinAxis * curSpinAmount, ForceMode.Acceleration);
        if(ballLaunch.landed) spinTime -= Time.deltaTime;
    }

this is called on collision stay currently

[timid dove]

just track your own spin thing and apply forces in e.g. OnCollisionStay

[hot garnet]

sorry could you clarify a bit?

[timid dove]

use your own variable to tarck spin

it could be a float or a vector or whatever

then just use AddForce when contacting the ground

(and reduce the spin too)

using actual angular velocity here is too much for the physics engine

[hot garnet]

ooh okay. Yeah that makes sense

thank you ill give that a shot

[neon island]

Would anyone know how to implement custom 2d joint using code. I tried all the joint available and none of them made what I needed. I want to make a climbing game where your arms are attached to your body and you can move them around. I am right now using simple impulse force directed toward the point I want the hand to be acting as some kind of spring then I am adding a force to dampen the movement, but that is where I am stuck, I am trying to get the relative velocity from the anchor point to the hand , and multiplying it by a factor smaller than 1 to dampen the movement but now everytime, I set it close to one, instead of not moving, every hand start going in every direction

Is there any easy way to implement dampening between two object with code while avoiding bug

[onyx elm]

Hi for some reason rigidbodies aren't falling down when gravity is turned on i have static disabled and is kinematic also disabled and no lock on positions

even if i create a new cube and add a rigidbody it still doesn't fall down

hmm i have installed an asset that adds rigidbodies to an object and drops the object when i press a button ( for level design purposes) maybe its interfering with normal rigidbodies

cause when press the button they do fall down

deleting the asset doesn't fix the issue

[timid dove]

sounds like it

[timid dove]

Check these project settings

[timid dove]

I mean this is a smoking gun though, right?

Your asset maybe set time to zero or otherwise messed with project physics settings

[onyx elm]

nothing looks out of the ordinary

[timid dove]

This does

this is wrong

set it to FixedUpdate

[onyx elm]

ohhhhhhhhhhhhhhhhhhhhhhhhh

[timid dove]

THis is from your asset

[onyx elm]

so the asset did change it

tysm

[chrome stag]

Hey everyone, I'm currently prototyping an on rails Starfox game with off rails sections but having trouble figuring out how to do the collisions. My "player" gameobject is going to be the child of a dolly object that moves along the level path... But if the player child has a rigidbody, I don't know how that will behave with collisions (since move position is in worldspace I'm pretty sure?)

I've been giving it some thought but I'm a bit stumped on the best way to handle this

I thought about just making colliders triggers, but that doesn't help if I need any extra info from the object passed into OnCollisionEnter

I thought about faking it by having an on rails player that handles collisions differently and then switching to an off rails player that uses a rigidbody but I don't really like that solution either

Most of my googling and asking a friend makes me think that you NEED a rigidbody if you want to use OnCollisionEnter or exit which kind of complicates things, so I'm not really sure what to do

[inner thistle]

What information do you need that isn't available on trigger collisions?

[neon island]

I am on a quest to make my own joint in 2D since the available joints don't fulfill my needs.

I need a joint that can stretch linearly like a spring and wobble angularly like an angular spring.

For that, I am able to make the forces using distance and some math but I am stuck at calculating the damping. I am able to calculate the current relative speed between the anchors point of the two objects using linearVelocity and angularVelocity with some trigonometry. I would reduce the relative speed by applying an Inpulse force that is opposed to the relative velocity multiplied by a factor smaller than 1 (1 would stop the part from moving). But I just don't know how to apply that force so it makes physical sense (do I apply different forces to both objects if they have different masses, or the same, etc.)

Is there any easy way to apply damp to two objects using code?

[proper falcon]

Hello, anyone available to help fix physics in my unity project? They object keeps glitching through the terrain despite the terrain having a terrain collider already

[fiery chasm]

Hello, I'm back at it with raycasts, and again, to no avail. this is the relevant code:

    void CheckForPath()
    {
        futurePosition = new Vector2(transform.position.x + speed*moveDirection, transform.position.y);
        RaycastHit2D hit = Physics2D.Raycast(futurePosition, Vector2.down, 2.0f);
        Debug.DrawRay(futurePosition, Vector2.down, Color.red, 2.0f);
        if (hit.collider.tag == "Ground" || hit.collider.tag == "WallJump")
        {
            canMove = true;
        }
        else
        {
            canMove = false;
        }
    }
}