#⚛️┃physics

1 messages · Page 20 of 1

timid dove
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On the Animator I believe. Or the animation clip. Forget which

royal jetty
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Huh, toggling that -kinda- works but it switches my rotation to translation for some reason

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like my bat no longer rotates, it moves instead...

dry moss
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I think this is just me messing up but what am I doing wrong here?
I put the following Raycast onto my camera:

if(Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, 3f)){
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It's only consistent from far away

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and yes the collision box of the container is perfectly sized, but even making it bigger doesn't help

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since I need it to detect multiple layers I do a switch for it, but the hit should return the first thing it hits, and there's nothing in the way, yet it's saying the layer it detects is 0(the wall behind it I presume)

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Oh my god I found it

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In short the raycast was hitting my character because my character was looking down and the ray had gotten so far by that point that it counted as a hit

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I put the layer to layer 2 - "ignore raycast"

carmine basin
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I have two objects that are connected via joints - when the joints are released, they don't collide until I manually depentrate them

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if it helps, they're both incredibly heavy (10k mass)

timid dove
dry moss
timid dove
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Also you can just use transform.forward here

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For the direction

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It's equivalent to what you have

dry moss
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Yeah idk why I did that ngl, thanks

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I’ll simplify it

timid dove
dry moss
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The thing you suggested is how I saw what the issue was lol

normal cargo
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Also good to draw the raycast in DrawGizmos so you can see what's happening

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(though not sure you would have realized the problem from that this time)

royal jetty
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If I make a simple animation that rotates a plank, it works. But if I press the "animate physics" button it no longer rotates and seems to treat the rotation as movement

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It's one object, no parent or children, simply animated as rotating yet enabling the animate physics prevents it from working

timid dove
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not sure what "seems to treat the rotation as movement" means

royal jetty
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No, no constraints

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It's easier to see if I have a parent object so let me remake my example, one sec

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Here is what I expect. This is what happens in the preview and also what happens if "animate physics" is off

timid dove
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what does the hierarchy look like?
What components are on each object?

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which object(s) are being animated?

royal jetty
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So, the bug also happens the same way when it's a single object animating itself

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so one sprite with a rigidbody, a box collider 2d, and an animation

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although the movement is less pronounced

timid dove
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rigidbody2D with what body type?

royal jetty
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kinematic, which is apparently necessary for animate physics

timid dove
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if it's being controlled by an animation I would expect it to be kinematic, yes

royal jetty
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In the exampe you're seeing, the animation is applied to an empty parent object

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just providing the pivot point really

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Just a plank really

image.png
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and a near empty parent

image.png
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The animation itself is a 45 degree rotation in the z axis only

image.png
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But surely people have to be using rotation with animate physics, right? Like I can't be the first person that's ever tried to rotate an object with animate physics on

timid dove
royal jetty
royal jetty
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This is with a kinematic rigidbody, by the way

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It's almost as if the animate physics needs more torque or something

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Huh? No this is definitely a bug.

It's converting my 45 degree rotation to radians and then pretending those radians are degrees

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So if I turn "animate physics" on then, instead of rotating 45 degrees it rotates 0.785 degrees (45 degrees in radians)
If I change my animation so the rotation is instead 90 degrees, it rotates 1.57 degrees (90 degrees in radians)

timid dove
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report it!

royal jetty
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Unfortunately my wacky workaround of rotating it 2600 degrees (roughly 45 radians which would then be treated as degrees) doesn't work. It's reduced to %360

timid dove
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the next option is just to abandon using the animator!

royal jetty
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I was using a hinge joint and a hinge motor before

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But I need more control over the motion, so I was trying to use animation

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HingeJoint 2d has its own really strange issues... If the torque is too high it's like it has to wind up

humble stump
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I use a hinge joint for my car door in unity. does anyone know how to make it not start to disconnect from the body when the car is moving?

royal willow
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instead of animation

silver moss
royal jetty
royal willow
royal jetty
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I've tried a few methods, one being the torque motor of the hingejoint2d, which wasn't satisfactory

royal willow
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if you are translating it or directly applying rotation it wont do anything physics wise

royal jetty
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Yeah the "MoveRotation" doesn't do anything physics wise

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I guess torque is the only way

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But controlling torque is a pain because now I can't limit the bat swing easily

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or control the timing

timid dove
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You can use angularVelocity

timid dove
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just make sure you're using it correctly

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MoveRotation can only really be used in FixedUpdate

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and only can be called once per physics frame

royal jetty
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it made my bat "eat into" into my ball and then ejecting the ball in a random direction as it passed through

timid dove
# royal jetty Hm, I'll try moving it there

To maybe help explain what it does - MoveRotation cues up the rotation until the physics simulation. it basically applies a temporary one-physics-frame-only angular velocity that will get your object to the desired rotation in a single physics frame

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if you call it again before the physics sim happens, it just overwrites the previously cued-up target rotation

royal jetty
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Still it seems to pass through my ball instead of ejecting it

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or, pushing it rather

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ah, had to set collision to continuous

polar nexus
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I just hacked this together for updating the rotation of a rigidbody with a FixedJoint(3D). Any better way of doing it?

var body = fixedJoint.connectedBody;
fixedJoint.connectedBody = null;
transform.rotation = Quaternion.LookRotation((transform.position - FacePointInput).normalized);
fixedJoint.connectedBody = body;
timid dove
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at least use the Rigidbody rotation

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this way will break interpolation

polar nexus
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understood (although im not using interpolation)

timid dove
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Still, best to avoid touching the Transform when dealing with physics

polar nexus
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yeah its a bad habit from my last project without rigidbodies

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its probably even worth it to do a search for any gameobject with a rigidbody that there is never a .position or .rotation right?

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Mnn unfortunately it doesn't seem to work. The RBs go nuts (going all over the place at hyper speed)

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part of the issue is that it is on every frame, but recreating the joint every frame seems also extremely suboptimal

timid dove
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well for one

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it should be in FixedUpdate, not Update

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since joints/physics won't even happen every frame

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but why are you doing this every frame?

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What's the goal here?

polar nexus
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alright let me demonstrate with a gif

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so my Mechs are fully composed of individual parts that are attached to eachother with Joints, those machine guns are attached with a fixed joint, but they should swivel based on the cursor position (red line point towards cursor)

mech.gif
timid dove
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Why not use a hinge joint?

polar nexus
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wouldnt that hinge on its own? freely i mean

timid dove
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If you don't want free physics interaction/simulation why use Rigidbodies/joints for the individual parts anyway?

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just make the guns child objects of the arms and rotate them as you please, without a separate Rigidbody

polar nexus
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well few reasons, it seemed easier to keep the rigidbody around since the components can also detach, and there didnt seem to be an easy way to "disable" the rigidbody for a while. The other reason is that for the persistence system (save/load game) it is considerably more practical to not have to move transforms around.

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but i'll think i'll go for the hinge and just apply rotational forces to point towards the cursor. However it comes with some annoyances like having to come up with control systems etc to keep things accurate

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(another reason for the rigidbody on each part is that that way, the mech is affected (balance, speed, mass) depending on what you attached)

timid dove
timid dove
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or use a separate prefab for the "attached" version and "unattached"

polar nexus
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you wouldn't be able to set a mass for a collider right?

timid dove
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right. Rigidbodies assume a uniform density across all colliders

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so you could add some overall mass to the main Rigidbody as you attach the collider, which will update the center off mass etc correctly, but you couldn't have different components have different densities

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if that's important

polar nexus
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i'd be easier to be honest to rely on joints and let the physics engine do the heavy lifting

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i'm quite suprised that it seems so trivial to just rotate a fixedjoint, yet it is seemingly impossible

timid dove
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Try hingejoint and updating the angular limits dynamically?

polar nexus
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yeah thats a good idea, as i update the limits, if the rotation is out of the limits, it will pretty much snap into the limit right?

timid dove
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I would expect so

polar nexus
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alright, thanks! giving it a go

royal jetty
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Do HingeJoints not work with kinematic rigidbodies at all?

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They don't appear to respond to torque generated by the hingeJoint motor

timid dove
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that's pretty much the whole point of kinematic.

royal jetty
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I thought it was that they didn't respond to external forces

timid dove
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they don't respond to any forces

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besides a joint would be an external force

royal jetty
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I suppose, even if they are on the same object it's a different component to the rigidbody itself

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Surprisingly difficult to make a reasonable bat

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Every solution appears to have a hard blocker that makes it not work

timid dove
royal jetty
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Animation doesn't work because animate physics is broken with rotation, hinge joint doesn't work because it can't be kinematic and the ball exerts a force on the bat as well

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yeah

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just, a bat that swings and hits a ball

timid dove
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I would just use Rigidbody.Move in FixedUpdate to move/rotate it

royal jetty
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I tried that but that exerts an insane amount of force on the ball

timid dove
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well i meean

royal jetty
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either the bat is very slow, which looks strange

timid dove
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it's an unstoppable force

royal jetty
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or the ball travels a million miles an hour

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right

timid dove
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You can also add different physics materials

royal jetty
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I might have to just

timid dove
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to change the bounciness of the collision

royal jetty
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make fake physics or something

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well the ball has to be bouncy because it bounces against objects later

timid dove
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sure but the bat can have its own material

royal jetty
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When two physics objects collide, how is the bounciness calculation done?

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If the bat has bounciness 0.2 and the ball is 1.0

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does that like, average out?

timid dove
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Er wait if it's 2D

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it's slightly different

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there's fewer settings

royal jetty
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Yeah, don't think I can configure that in my 2d material

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the torque-controlled HingeJoint2d definitely won't work, at least

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unfortunate with the animation, that would have worked nicely if it wasn't for the unity bug

polar nexus
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oof, it was looking good, i updated the min,max angle in the editor and the weapon rb would align to the angle, then i tried aligning it with code and I can see the values update in the editor (see gif) but the weapon stays completely still. Any tips?

float angle = Mathf.Sin(Time.time * 2f) * 45f;
JointLimits limits = hinge.limits;
limits.min = angle;
limits.max = angle;
hinge.limits = limits;
mech2.gif
dapper ember
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if i use rb.AddForce in fixedupdate, when will the rb.velocity actually get modified? I think its during the physics simulation ,but does that get called right after fixedUpdate()?

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Is it bad practice in FixedUpdate(), to call AddForce multiple times in a row and in between the calls, access rb.velocity? Like this:

    private void FixedUpdate()
    {

        if (ePressed)
            rb.AddForce(localGravity * Vector3.down, localGravityForceMode);

        rb.AddForce(forwardForce * transform.forward, forceMode);

        if (qPressed)
        {
            Vector3 v1 = Vector3.ProjectOnPlane(rb.velocity, transform.forward);
            rb.velocity = Vector3.ProjectOnPlane(rb.velocity, v1);
        }

        if (sPressed)
        {
            rb.AddForce(upForce * Vector3.up, upForceMode);
        }

        if (wPressed)
            rb.AddForce(downForceW * Vector3.down, downForceWMode);

    }
timid dove
unique cave
dapper ember
humble stump
zenith zenith
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I'm trying to implement collision in OnCollisionEnter2D by reflecting the velocity based on a variable called previousVelocity. Based on debug, Update and FixedUpdate get called first with the correct velocity however the previousVelocity value in collision (3rd print statement) is 0 for some reason

image.png
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because its the last printed it should be the last one that was called but the variable just isnt updated?

quick mortar
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Hi guys, Anyone have any idea for making a projectile line that can also predict bounce? I tried tarodev's way of simulating into another scene, only problem is that unity seems to be inconsistent when it comes to physics especially when there's bouncing. There's no easy solution unless I rework everything to DOTS or tweak physics settings to have less errors but wayyy more expensive computations. I also do some manual physics so I think that's adding more to the inconsistency (maybe?)

half creek
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is there a way to make 2d joints more stable/stronger? I need the joints on the left to look like ones on the right (on the right the boxes have position and rotation constrains)

image.png image.png
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Current joint settings:

image.png
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I also tried other types of joints, but without much improvement

silver moss
half creek
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looks good, but unfortunately it appears to be 3D only

silver moss
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Ah damn, didnt notice you use 2D

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How do you want it to behave? Like a bridge that is straight until you step on it or what?

half creek
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yeah, exactly

silver moss
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Did you try a smaller Distance?

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Friction might have some edfect here too

half creek
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yes, but that just shortened the platform

silver moss
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Lots of trial and error goes into this stuff

half creek
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tried more friction too, but maybe not enough

silver moss
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If nothing works then doing it manually with forces is worth trying too

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Without joints I mean

half creek
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will give it a shot later, thanks

quick mortar
static shuttle
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heyyyy fellas

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and not fellas idk

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ive got a rigged and procedurally animated mesh thats suddenly having a lot of issues.

basically, the mesh still works and everything is working as intended. The giraffe dude still ragdolls and stuff like he should. However, take a look at the screenshots and you'll come to find the rig isnt moving with the mesh and player.

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has anyone seen this issue before and knows how to deal with it?

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ive been messing with this for about a day and a bit now, the ragdolling is perfect and hes so bouncy and stuff, the head also moves with the mouse and hes capable of walking, but now that im done with all that, the rig just doesnt move which kinda removes all my previous work as the targets control the body obv

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i just cant figure out whats going on

humble stump
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why does it take my wheel colliders so long to brake no matter the brakeTorque i apply?

static shuttle
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damn

exotic hill
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Hello, I'm using 2D physics, there is any way to avoid objects by pushing themselves, for example I have a player and enemies, but they push the player.

woeful pulsar
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@exotic hill If it can collide (in the unity physx sense) with the player, then it'll affect the player. There is no way around that.

If you want the player to push the objects around but you want those objects to not affect the player in any kind of way, what you can do is set the objects colliders to trigger, monitor trigger stay events on the player and manually add force to the triggered objects.

If you need those objects to still interact with the world, you can create a system of compound colliders where some are triggers and some aren't, and then layer the objects accordingly.

queen stone
# humble stump why does it take my wheel colliders so long to brake no matter the brakeTorque i...

There is no context so really hard to answer but it's usually due to

  • Low vehicle mass, set the mass at least to 1000
  • High COM, try lowering that Center Of Mass
  • You are not using ABS, it works just as it does in real life (I've tested it)
  • Low stifness of wheel collider (not the sideways one), increasing the stifnees makes the brake and torque more efficient
  • You can hard code a down force to make the grip stronger: void Update() { rigidbody.AddForce(-Vector3.up * downForce); }
static shuttle
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got a quadrupedal player character thats wigging out atm

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wondering if its because its mass is below 1

queen stone
static shuttle
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i get you

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anyway, this character i have is animated through physics, like literally forcing each foot to move forward instead of traditional animation in order to get a really nice human fall flat like movement system right, but now no collision is working

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wondering if mass couldve had something to do with it

long cape
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Does anyone have any clue why if I attach any 3D object to my sprite it gets flattened out? 3D colliders also gets flattened out no matter what Z value I set to it. This does not happen to any of my other 2D sprites, just this one.

assss.png
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nvm, solved it.

rigid adder
timid dove
rigid adder
timid dove
rigid adder
#

There is code elsewhere which sets movement speed based on the joystick, but colliding with the slope is not changing speed, which is why it sticks in place. Its the vertical speed continuing to play out, and then falling.

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There isn't any code anywhere which sets vertical speed to 0, either.

timid dove
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!code

flint portalBOT
timid dove
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Please don't use screenshots

sturdy stream
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I changed the custom physics shape on some of my tiles but they end up resetting specifically in the game's build. Is there a way to fix this?

rigid adder
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Figured out the problem with the character controller, but now its left me with more questions.
If I move the controller with a vector3 that has horizontal and vertical movement, the object will:
slide up horizontal walls properly.
fail to slide along a sloped cieling.

But if I move with horizontal only, and then move with vertical seperately, it's reversed. It no longer slides along walls, but slides along sloped cielings.

royal jetty
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Unity's 2d gravity feels really slow to me. Like a ball rolls off a table and floats gently in the air for a good while before it actually starts falling. I've heard this is a gravity / object scale thing, but what is the actual reasonable scale for an object to behave like it would in real life?

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Heck, the entire physics simulation feels pretty slow overall.

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Am I having these issues because my 2d objects are fuckin' massive? Assuming something like a baseball is roughly 2 unity units

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Also, suppose I vastly increase the gravity scale, will I have other physics related issues from oversized objects?

Is there maybe a way to set "world scale" so I don't have to work with tiny units all the time?

timid dove
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The default circle is a 1 meter diameter circle, which is massive

royal jetty
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So if I wanted baseball physics then my baseball should be 0.1 unity units

timid dove
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0.075 units in diameter

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Just looked it up

royal jetty
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Right

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But working in very small units is kinda annoying

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if I set the gravity scale to 10, does that produce the same result?

timid dove
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No because then all your forces and lighting and everything else are not modeled correctly

royal jetty
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Right

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Does object size affect the other basic unity forces? Like friction, bounciness

timid dove
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Your 2 unit baseball is elephant sized.

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It might affect your perception of those things

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That stuff is determined by physics materials

royal jetty
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Yeah I just mean like, an elephant sized baseball bounces differently from a normal sized baseball right

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it also handles linear drag differently

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(Also, this is unrelated, but Unity found and reproduced my issue with Animate Physics converting degrees to radians)

timid dove
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Only in the sense that your perceptions of distance relative to it are skewed

royal jetty
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I'm torn between just increasing the gravity scale and dealing with whatever wonkyness that brings and working in a sub 1 distance space

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I have objects that would be 0.01 unity units large and that's pretty annoying to work with

timid dove
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Probably less annoying than compensating 15 other things in the world

royal jetty
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Do you know specifically what it would affect?

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I couldn't find a list and the only thing I know about is gravity

timid dove
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Perception of distances and forces, all the numbers in your code would need to be adjusted. Lighting.

stuck bay
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I am trying to create a spherical planet. But i have a problem about "non-perfect" sphere. Since a sphere cannot be fully spherical due to performance reasons, the spherical objects will have perpendicular edges nor small or big.
The problem i faced, whenever i put a mid-perfect spherical ball on the planet, the gravity being applied looping itself whenever there is a edge that is perpendicular to the center. I would like to know if it has a name. I want to search but i don't know how to explain or name this!

SphericalGravity.jpg
stuck bay
royal jetty
stuck bay
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It is going right and left continuously

royal jetty
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You mean it slides back and forth on the surface

stuck bay
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Exactly!

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I thought of casting a ray

royal jetty
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What kind of collider is this?

stuck bay
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It is only two sphere

stuck bay
royal jetty
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Sphere colliders are in fact perfect

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or, as near to as not to matter anyway.

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Are you sure you're not using a polygon collider?

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A sphere collider isn't jagged like your example above. A sphere collider simply measures the distance between two objects.

timid dove
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Yeah I'm trying to figure out where this "non perfect" sphere is coming from

stuck bay
royal jetty
timid dove
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Showing the code would be a good start

stuck bay
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I am so bad at explaining things sorry for that but wait :d i will show it

royal jetty
timid dove
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And also a video or image of the issue yes

royal jetty
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If not, your ball won't slow down and could wobble back and forth

stuck bay
# royal jetty If not, your ball won't slow down and could wobble back and forth

Let me explain again. The planet cant be a perfect sphere here. The problem here is a planet that has a perpendicular edge to the center of the planet. The center of the planet is pulling all of the rigidbodies to itself. Basically, the direction kinda offsets in that edge.
Of course i tried to play with friction and such drag and angular drag. This did solves a little but it makes the ball hard to go. The player will have to interact those dynamically in the future. Should i go with drag and angular drag?

Using code:

var calculatedPull = (planet.transform.position - ball.transform.position).normalized;
ball.AddForce(calculatedPull * pullGravity, ForceMode.Acceleration);
image.png image.png
royal jetty
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This is not a sphere collider

stuck bay
#

Yes my apologizes for that. As i said earlier, i am bad at explaining things.

image.png
royal jetty
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Is there a reason why you're using a mesh collider instead of a sphere collider?

stuck bay
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Of course! I wanted to simulate a world that is not perfect here

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I am glad i did

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Caught that bug

royal jetty
#

as your planet is "imperfect" the ball moves sideways

stuck bay
#

Yesss you are awesome

timid dove
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Which is exactly what you'd expect, because it's like having a hill on the planet

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And it's rolling down the hill

royal jetty
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then it builds up speed from this accumulating force

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moves to the other side, slows down, and repeats the process

image.png
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there is no friction or drag

stuck bay
royal jetty
#

from the moon's perspective your world is basically shaped like this.

image.png
stuck bay
#

Thank you for helping, both 🙏🏻 I wont touch this thing further since it is an expected thing to happen then

sturdy stream
timid dove
versed stag
#

Exactly when is OnCollisionExit2D being called?

In the image i have drawn a ball bouncing and its posistion in two separete ticks, is OnCollisionExit2D happening on tick 2 (the first tick after the ball has bounced), or at "a" where the ball leaves the surface.

i am working on a brick breaker game and i want to override the bounce direction of a collision. but there seems to be no "Physics.ContactModifyEvent" for 2D, so i was wondering if setting the velocity OnCollisionExit2D would function instead

image.png
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(alternativly i could use a trigger, but then the question would still be the same, just with OnTriggerEnter2D)

versed stag
#

i did some experimenting with checking positions and velocity of incomming bouncy balls. the velocity changed already OnCollisionEnter2D, and the posistion of OnCollisionEnter2D and Exit2D varied a bit. i am unsure if this means that the physics aren't interpolated in the way i thought around collisions (where a collision only happens on a tick), or if the Enter/Exit2D methods only happen on ticks (but the bounce can happen between ticks)

inner thistle
#

Physics is simulated only on ticks. Nothing can happen in between them

timid dove
#

It goes (simplified):
FixedUpdate -> Internal Physics Simulation -> OnCollision/OnTrigger callbacks

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this all happens once per "physics tick"

versed stag
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i think i get it. so using OnTrigger or OnCollision will happen after a new position has been set, and thus i can't use those to customize the bounce direction by setting the velocity then. Is there a way to handle / override the collision itself then? like how 3d has Physics.ContactModifyEvent?

timid dove
versed stag
#

that is unfurtunate, but thanks for the help anyways.

simple tulip
#

Hello everyone, I’m a beginner and I’m trying for days to create a fishing net to launch for my VR game (you grab a sphere of the net and when you launch it you capture some stuff)

So far I’m trying to do it with few spheres and configurable joints and a XR grab Interacable on the spheres (the ropes are from an asset) but it’s not working, the spheres are falling and when I launch it, the net doesn’t open, the spheres stay close to each other.

I tried so manyyyy configurations for the joints / gravity but nothing is working…

Anyone would have some advice to do it? The net has to be open during the flight but to take the shape of the stuff to capture.

Thanks a lot !

fishing_ne2t.png
runic warren
#

I want to constrain a dynamic rigidbody to only move along a spline which I've sort of figured out how to do in two ways.

void FixedUpdate()
{
  SplineUtility.GetNearestPoint(rail, rb.position, out var nearest, out float _);
  transform.position = nearest;
  rb.velocity *= Vector3.Dot(rb.velocity, transform.forward);
}```In this first method, I'm able to keep the rigidbody locked to only move along the spline, but collisions bug out frequently, at least when messing with things in scene view. 

```cs
void FixedUpdate()
{
  SplineUtility.GetNearestPoint(rail, rb.position, out var nearest, out float _);
  
  rb.AddForce((new Vector3(nearest.x, nearest.y, nearest.z) - rb.position)*10);
}```In this second method, the physics are more stable, but the rigidbody isn't locked to the spline, it just gets pushed towards the nearest point on it.

Is there any better approach to doing this or am I missing something?
rustic quiver
#

i know this may sound vague but i do not know how to or where to start, im making a pinball game and i have no clue how to make the physics for the ball any tip?

dense tide
#

how do i make two objects not push each other while walking

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if i make the mass equal, then one of them will get pushed if they aren't walking

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and i want gravity and stuff to still work

bleak umbra
marsh dirge
#

I have 2d box collider on player and 2d box collider on border, when player touches border it will start to slide around map why is that happening? I want to make him in box so he cant leave area, can I do it somehow by script so he doesnt slide when he collides with wall?

#

I have box collider 2d on player and on wall, both of them have rigidbody2d component, when player collides into a wall player will start sliding in one way like im moving him there but i aint.

frigid pier
#

This is not enough information, you need to describe all complenets you are using and method how you moving it

marsh dirge
#

and this on wall

image.png
frigid pier
marsh dirge
#

wait how can I fix it then, what should I change

#

how can I handle collision myself

frigid pier
#

detect collision with non floor objects, interrupt/lock move logic that direction

marsh dirge
#

how to detect collision with non floor objects, what do you mean by non floor objects?

frigid pier
#

The things you bump into. That have different physics layer or tag to distinguish them from the floor

elfin carbon
#

Hey guys, I'm developing a multiplayer game with client prediction and am having an interesting physics log that I can't find on google anywhere.

In order to do server reconciliation, I need to re-simulate 1 rigidbody in the scene (the player) in the event that they fall out of sync with the server's position. I'm getting the attached log on the server

image.png
#

Here's the code that's being executed on the server

image.png
#

This is not called from a physics callback like OnCollisionEnter anywhere. It's called in a server remote procedure call

#

Aside from this method, the server runs with autosimulation (fixedupdate)

weary anvil
#

Can anyone tell me why my wheel collider won't collide with my Cube?

image.png image.png
timid dove
#

the blue arrow should face forward. Green should face upward. Red should face to the right. (According to the object)

weary anvil
dapper ember
#

How can I make a fish controller that allows me to bend the fish's head and tail in both up and down directions (i.e, it can make "U" or "n" shape), and so that it interacts with other objects in the scene?

Example situation:
If the fish is lying in default pose on the ground, i.e just flat and tail and head aren't bending at all, and we wanna bend the fish into n shape, then we push the tail and head down, and the middle part of the fish should go up. Like bend in that shape.

Another example:
We can have the fish in a U shape next to a wall, so that the tail is touching the ground, and the head is touching the wall.

royal willow
#

make 2 box colliders with rigidbodies, then connect them via joints

#

if you press A rotate one of the collider objects one way and the other one the opposite

#

if you press D invert the collider rotations

#

etc

tight compass
#

Hey! can anyone help me figure out a solution to a problem im having with joints in unity? I have a floating player capsule that uses spring forces to stay at a desired height and torque forces to stay upright ( like in the character controller video by Toyful Games ) and im trying to add some hands to the player that are just floating spheres connected by a configurable joint. I have set the rigidbodies on the hands to have 0 mass but they are still adding weight to my player, throwing off the forces keeping him floating and upright. adjusting the spring and dampening forces stops the oscillations but then effects the feel of the controller. I hope this makes sense, I can provide more details that will help, if needed. Cheers!

short sable
timid dove
short sable
timid dove
#

That is what I said yes

#

Well I said it would be easier that way

short sable
short sable
timid dove
#

You can even make your Rigidbody kinematic if you want

#

I was just saying it would be easier with RB because you can use joints.

short sable
#

can I still have a character controller and a rigid body together?

dapper ember
#

if I have two rigidbody objects, and one is connected to the other via Character Joint. What is the correct way to make sure that the one with the joint won't make the other one move too much?

#

idk if increasing mass of the other is proper way because the docs say that:

The physics solver produces better results when the connected Rigidbodies have a similar mass.

royal willow
#

you can make the opposing rigidbody kinematic if needed

#

i should ask before i get carried away, how much is the other rigidbody moving?

dapper ember
hallow plover
plush plinth
#

any tips on how to prevent this? Creating a jenga game and the blocks seem to be clipping

image.png
boreal shale
#

how is drag calculated? is if just -[drag]m/s^2

royal willow
royal willow
timid dove
boreal shale
#

yes

timid dove
hallow plover
royal willow
#

and pretty much all physics interactions

hallow plover
royal willow
#

by moving the charactercontroller down every frame until it hits ground then you reset the velocity that you were applying

#

you can look up a tutorial on how this works if needed

static spruce
#

Hello. I have a problem where a gameObject is not detected.
This is the code from that gameObject and it tried to destroy other gameObject like him if there are more:

private void DestroyExtraRoomConectors()
    {
        Collider2D[] colliders = Physics2D.OverlapPointAll(transform.position,5);
        foreach (Collider2D collider in colliders)
        {
            Debug.Log(collider.gameObject.tag);
            if (collider.gameObject.CompareTag("RoomConector"))
            {
                if (gameObject.GetInstanceID()<collider.gameObject.GetInstanceID()) Destroy(collider.gameObject);
                else Destroy(gameObject); 
            }
        }
    }

This is the gameObject Inspector:

image.png
#

The Debug.Log just shows other GameObjects that are not in the layer 5, and that's strange

#

Is more information needed?

timid dove
static spruce
#

I have tried setting the layer to 0 (default), but it doesn't work anyway

timid dove
static spruce
timid dove
static spruce
#

It was related to another part of the code

timid dove
#

Your layer mask was the problem

#

Or at least one of the problems

static spruce
#

Isn't layerMask an int?

timid dove
#

Well it's valid but it doesn't mean layer 5

#

It's a bitmask

#

5 is 0101 in binary

#

So that would cover layers 0 and 2

#

Exposr your layer mask in the inspector to set it properly

#

Or use LayerMask.GetMask

static spruce
static spruce
timid dove
#

Well you'd have to understand how bitmasks work

#

It's not that complicated, it's just saying that it allows any layer where there's a 1 in the binary representation of the number

static spruce
#

I will look for it on internet

timid dove
#

Int is 32 bits, so there's 32 layers

static spruce
ashen swift
#

my distance joint doesnt work

Screenshot_2024-03-26_144435.png
unique cave
ashen swift
#

fuck off

#

idk what i dont know

frigid pier
#

!mute 1182622982514937947 3d Insulting community members ignoring advice.

flint portalBOT
#

dynoSuccess undyingtriad was muted.

mighty zenith
#

hey guys, i have an issue rotating 2d active ragdoll. it's brokes when rotates multiple times and teleporting up and down. here is code for movement and balancing: https://hastebin.com/share/ecuhifasas.csharp

image.png image.png
Hastebin

Hastebin is a free web-based pastebin service for storing and sharing text and code snippets with anyone. Get started now.

mighty zenith
#

it's getting even worse! please someone help.

image.png
timid dove
mighty zenith
timid dove
#

you are directly modifying the Transform of your physics object

#

this is going to wreak havoc

mighty zenith
#

but how i can rotate this guy otherwise?

timid dove
#

honestly no idea. Never seen an active ragdoll game that has the character flip

#

generally they're super finicky

mighty zenith
timid dove
#

When you say "with physics" what do you mean exactly

#

Do you actually need ragdoll physics

#

or just general player physics

mighty zenith
#

well i just want players can see gunshot reaction and falling after death or in coma

timid dove
#

after death you can replace your character with a ragdoll. YOu don't need it to be one the whole time

#

that's super common

mighty zenith
#

oh

#

but still need a way to animate at least legs so they will stand on stair or other non-standard reliefs

timid dove
#

You don't need ragdoll physics for that

queen marsh
#

Testing out Unity 6 preview and I noticed this under the Physics tab
Is this going to allow Unity Physics/Havok to be used outside of DOTS? Or does this just mean developers will be able to add their own physics engines to this list (i.e to be published on the asset store)?

image.png
timid dove
queen marsh
#

Oh didn't see that post, thanks! Very happy to see this being implemented

warm patrol
#

Hey, can I get the position of the colliding spot? Like that:

image.png
light gate
warm patrol
hollow quartz
#

I'm making a multiplayer game, and I want to add ragdoll physics to player when the player dies. But when I activate the ragdoll physics (rigidbodies) the player just flys to the moon XD I am using ragdoll first time and I don't know how to fix this issue.

image.png image.png
carmine basin
#

SpherecastAllNonAlloc seems to be passing through objects at very specific positions and then hitting backfaces, but not correctly generating RaycastHit.point

#

When firing a raycast via the aforementioned at a wall, and moving a trail renderer to the hit point, it will sometimes not hit the front of the box collider (the face i'm aiming at), and instead pass through and hit on the inside of the box collider. The trail renderer will then move to the origin of the scene

#

okay, according to the docs, its meant to hit backfaces, silly me

#

I've decided to offset the starting point of the spherecast by a small amount, and extend the distance of the spherecast by that same amount

#

Unfortunately, I'm still getting over-penetration AND the hit point is still set to origin on some of them

#

Notes: For colliders that overlap the sphere at the start of the sweep, RaycastHit.normal is set opposite to the direction of the sweep, RaycastHit.distance is set to zero, and the zero vector gets returned in RaycastHit.point

#

this is from the SpherecastAll API page, and I'm not quite sure I understand

#

weird, there's still some huge over-penetration

#

the raycast doesn't start OR end anywhere near the collider, still passes through the collider, but somehow doesn't hit?

#

how on earth are these NOT hitting??

image.png
#

has anyone experienced something like this before?

#

the magenta lines upwards show the end point of a spherecast. SOMEHOW, this isn't hitting? but if I fire the spherecast from another angle, it's fine

image.png image.png
carmine basin
#

If anyone knows why this is doing what it is, or how, or anything about this, please @ me

mossy swan
#

I'm generating my own heightmap for my terrain. Currently I'm just using a MeshCollider on it, but is it better to use a TerrainCollider - which is a heightmap grid? I still want to render my custom terrain myself, so this is 100% about the most optimal collider for a heightmap. There seems to be conflicting information when I looked online because some of it was also considering the rendering costs too. Can I even use a TerrainCollider without a rendered terrain?

static kestrel
#

I'm having trouble with a jump script for my player character in Unity. The issue is that during the first jump, the character ascends much higher than expected, but subsequent jumps work correctly. Here is the physics code ```
public void Trigger()
{
if(!canJump) Debug.Log("no jump charges");
if(!canJump) return;
Debug.Log("Jump triggered");
_rb.velocity = new Vector3(_rb.velocity.x, 0, _rb.velocity.z);
_rb.AddForce(Vector3.up * _jumpForce, ForceMode.Impulse);
_remainingCharges--;
Debug.Log($"Remaining charges after trigger: {_remainingCharges}");
}

#

state code: ```using Player.Actions.Implementations;
using UnityEngine;

public class PlayerJumpingState : MonoBehaviour, IState<PlayerState>
{
private PlayerCharacter _player;
private bool _isJumpInputReleased;

void Awake() => _player ??= GetComponent<PlayerCharacter>();

public void EnterState(StateManager<PlayerState> stateManager)
{
    if(_player.physicsManager.isGrounded())
        {stateManager.ChangeState(PlayerState.Idling);}

    if(!_player.actionManager.jumpAction.canJump) {
        stateManager.ChangeState(PlayerState.Flying);
        return;
    }

    _player.rb.drag = _player.parameters.AirDrag;
    _isJumpInputReleased = false;
}

public void ExitState(StateManager<PlayerState> stateManager)
{
    if(_player.physicsManager.isGrounded())
        _player.rb.drag = _player.parameters.GroundDrag;
}

public void UpdateState(StateManager<PlayerState> stateManager)
{
    _player.actionManager.lookAction.Trigger(_player.inputManager.LookInput);

    if (!_player.inputManager.isJumpTriggered)
        _isJumpInputReleased = true;

    if (_player.inputManager.isJumpTriggered && _isJumpInputReleased)
    {
        _player.actionManager.jumpAction.Trigger();
        _isJumpInputReleased = false;
    }

    if(!_player.actionManager.jumpAction.canJump)
        stateManager.ChangeState(PlayerState.Flying);

}

public void FixedUpdateState(StateManager<PlayerState> stateManager)
{
    _player.actionManager.moveAction.Trigger(_player.inputManager.MovementInput, _player.physicsManager.getMovementSpeed);


    if(_isJumpInputReleased && _player.rb.velocity.y > 0)
        _player.rb.AddForce(Vector3.down * 2f);
}

}```

timid breach
#

is there a better way to get collisions for curved objects, i am using polycollider even after 94 points i get this mess, there are too many boxes

image.png
timid dove
timid breach
timid dove
#

why do you have boxes

#

what are you trying to achieve here? How did you get to a bunch of boxes

#

what curved object are you trying to make a collider for?

timid breach
#

i dont know why the points get converted into the boxes

#

@timid dove is that what unity usually does or is conversion into multiple box colliders abnormal

timid dove
#

it triangulates the given shape

timid breach
#

then i dont know why this is happening with me

timid dove
#

also as you see the collider gizmo is green

#

I don't know what the yellow thing you showed was

#

but it wasn't a collider

#

or at least not a unity collider

#

are you using a networking framework or something?

timid breach
#

i turned on the collider bounds

image.png
timid dove
#

they are not the collider shape itself

timid breach
#

ohk, i just fixed the problem, had to fix some random points

simple hearth
#

Is there an efficient way to lower physics costs of Unity? I'm okay with flaws etc if it's going to free some of the cpu usage

image.png
simple hearth
#

or is it just "take it or leave it" scenario and I'm not going to be able to optimize it?

timid dove
#

Including making the fixed timestep larger

simple hearth
#

can you recommend any guide to tweak them?

#

I want to avoid to tweak physics settings randomly since it may break things..

simple hearth
#

found this, thanks

signal wyvern
#

Hi guys quick question. I Have two objects A & B. Both are physical objects with rbs, I want object A to collide normally with Object B however I don’t want Object B to be influenced by object A at all.

#

I cannot set either object to Kinimatic as both are moved by other forces.

#

Anyone with advanced physics experience able to help explain how I can achieve this?

gloomy geyser
#

I don’t know how to do it in Unity, I’m more familiar with Unreal’s physics engine. I assume it's similar? At least in Unreal you can assign each object a collision channel, partition each object into different collision layers and change the default collision response of each object independently to your preference

signal wyvern
gloomy geyser
#

Oh, ok. Sorry I can't help much, I'm new to Unity 🙃

#

In Unreal you would be able to control each layer independently

timid dove
# signal wyvern Hi guys quick question. I Have two objects A & B. Both are physical objects with...

There's an asset that does this
https://youtu.be/BAlxxIDneVg?si=5vDSuSL7oYMau3_W

YouTube
Sadness Monday Productions
BetterPhysics Selective Kinematics Tutorial

A more in-depth view at the Selective Kinematics feature of BetterPhysics

BetterPhysics is a must-have physics asset that adds essential features to Unity's physics engine. In this video we take a closer look at the Selective Kinematics feature which lets you create and configure custom interactions between dynamic Rigidbodies.

Selective Kinem...

▶ Play video
signal wyvern
#

I’d purchase but I have no idea how performant your solution is.

gloomy geyser
#

Is Unity’s collision system at least similar to UEs?

#

I’d like to learn more about it

novel light
gloomy geyser
royal willow
#

unity3D use PhysX while the unity2D uses Box2D

timid breach
#

i am creating a dash move but at highspeed rigidbody2d does not act as expected, the capsulecollider2d goes into the ground collisions , making my player completely static
is there a better way to make dash move without this problem
(i have tried collision detection mode on continuous as well)

gloomy geyser
royal willow
#

and interpolate to interpolate

timid breach
timid breach
royal willow
#

well how exactly fast is this rigidbody going?

#

there are limits for the physics system to catch up

timid breach
royal willow
#

well show us

timid breach
#

I'm currently out, I will mention as soon as I'm able to

rapid pollen
#

Hello!
I have approx 500 rigidbodies in one of my scenes, which as you can guess is super mega taxing.
I was wondering if it would be more taxing to do a check every second for each of those for distance with the player and activate/deactivate kinematic depending on if the player is close in order to keep performance.
Any opinions on the matter? Do you peeps have better ideas?

unique cave
narrow pier
rapid pollen
unique cave
signal wyvern
rapid pollen
#

maybe they're not sleeping as they should?

unique cave
rapid pollen
#

ha! thank sfor the tip. None of them are indeed sleeping.

unique cave
rapid pollen
#

strange since they're not moving around at all

unique cave
#

also make sure the sleeping thresholds are at their default values in the physics settings

rapid pollen
#

god oh god

#

thank you aleksiH
I had completely forgotten my buoyancy code; I thought if I did an "addforce" of strength 0 (when not in water), it would not count

#

towards going asleep or not

#

turns out it does count

unique cave
#

definitely will

rapid pollen
#

its all sleeping properly now

#

and performance is beautiful
thanks!

unique cave
#

np

narrow pier
# signal wyvern Thanks a lot i will take a look, Im curious what did you use this for in your ga...

Are you familiar with object interaction in games made by Frictional (Amnesia, SOMA, Penumbra)? I'm trying to replicate exactly that. The problem I had is kinda complicated to describe in words without video, but in short, I wanted to prevent player from easily moving heavy objects using light objects (imagine taking a cup of water, pushing it against a 20 kg barrel and moving it like it's nothing). Now I understand that I approached the problem from the wrong perspective, but left solution for selective kinematics for later use.

unique cave
rapid pollen
#

thanks again

signal wyvern
gentle holly
#

I have a really weird problem I can't solve :/

NavMeshAgent (with Collider & kinematic Rigidbody) and a box with a script that includes OnTriggerEnter . Very simple setup. I have 2 problems:

  • OnTriggerEnter is being called every frame the agent moves, almost as if it was OnTriggerStay.
  • OnTriggerExit doesn't get called at all

What on earth is going on?

timid dove
gentle holly
#

is that a thing?

timid dove
#

Yes

gentle holly
#

Well, I'm not familiar with that. But I did discover that how I'm moving my agents has something to do with it

#

I am setting a destination every frame, and it is somewhere immediately in front of my character (because i use keyboard controls to move the main character around a navmesh)

#

i don't know why, but i do know that if i make an agent pass through a trigger by only setting the destination during start, it works fine

narrow pier
stable briar
#

I just wanna know something, the physics are calculated depending on the framerate while running the game, or its more about the quality of the CPU/GPU ?

unique cave
stable briar
#

I saw a video on godot which says physic works diffrently on an other devices so I was curious if it was the same thing in Unity

timid dove
unique cave
#

Don't think it's guaranteed to be deterministic anyway regardless of presicion

dapper eagle
#

Is it possible the built in wheel colliders have a bug with the steering value? I am in debug mode and see my input is correct, i can see both negative and positive values but when i look at the wheel collider visuals the wheels only turn to the right.

inner thistle
#

I'm pretty sure someone would have noticed by now if steering was that broken

small cove
#

Trying to add force to my player so they go up and to the side and while moving up looks fine when they get pushed to the side it looks like they’re teleporting

#

Ik it’s cause of the push force being so high but is there a way to keep the push force and make it so that the player doesn’t look like it’s teleporting

dapper eagle
#

I have tested with throttle and it's not just the visual, i am on 2022.3.20f1 right now. I am very sure my input is correct too

timid dove
royal willow
#

there are hard limits to a rigidbody and going over that can cause weird effects

timid dove
#

you would have to show us what you mean

#

and perhaps share your movement code

#

usually that kind of thing happens because you're trying to use two incompatible forms of motion

rapid talon
#

any ideas why a physics cast (overlap box) is not always detecting target obejct and yet a trigger collider does? the overlap box is attached to an animated object that doesn't even move that fast and yet there are times it doesn't detect the target object

dapper eagle
#

I figured it out, it was a very stupid mistake, accidentally had a nagative value * with another negative value causing the steering always to be positive

coral moat
#

guys how can i make the springjoint not affecting my main obj like i have a drone and if i attach something using a spring joint it drags the drone to the floor

wispy hemlock
#

Hi all,

Sooo, I'm having a weird issue that I can't seem to figure out.

I'm building a Scifi Rover Rig, with (front to back) suspension arms, but my code to match the wheel mesh positions to the wheel colliders is doing something screwy (attached pic) with the mesh positions. Can anyone see where I'm going wrong please? ((I know that I'll probably have to redo/rethink my hierarchy layout at some point, because the arms don't line up correctly, I know why, just not sure how to fix)

https://hastebin.com/share/suguzaquri.csharp

image.png
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timid dove
warm patrol
#

Hey, does someone know what can be wrong? I have a Raycast (Debug.DrawLine on the first screenshot) with a layerMask of 6. This wall has the same layerMask, but Raycast doesn't see it and says that (Physics.Raycast(ownerScript.head.transform.position, ownerScript.playerPositionOnHead, Vector3.Distance(ownerScript.head.transform.position, ownerScript.playerPositionOnHead), 1 << 6)); is `false.

image.png image.png
timid dove
#

Oh actually it seems pretty clear

#

You're passing two position vectors into Raycast

#

Raycast expects a position and a direction, so you're using the wrong parameters

#

It would be more analogous to Debug.DrawRay

#

If you want to use two positions you should be using Physics.Linecast instead

warm patrol
deft topaz
#

Hi everyone, I'm a bit desperate with this problem.

I'm trying to shoot a cannonball out of a cannon in a 3D space, but the cannonball lands significantly beyond the target. I'm using physics calculations to determine the initial velocity based on the launch angle and time to land.

The problem is not so complex because the only force applied in this scenario is gravity, the object has no drag. And yet for the life of me I can't figure out what's wrong 😦

For my X and Z axes I'm using Uniform Rectilinear Motion with the equation
x = v0x * cos(alpha) * t + x0*
where x is the position in the x axis, v0x the initial velocity (what I would like to figure out), alpha the angle, t the time to land and x0 the initial position.

For my Y axis I'm using uniformly accelerated (by gravity only).
Mainly,
y = y0 + v0y * sin(alpha) * t - 1/2 gt^2
where y is the position in the y axis, y0 the initial position, v0y the initial velocity (also want to figure it out), and g is gravity force.

And yet, applying all of this results in a very wacky cannonball launch...

I've looked in many other posts, but either their requirements weren't the same as mine, or they used a different equation they barely explained

Here is the code:
https://pastebin.com/r3gq7sjg

Thank you for any tips you can give me, and anything else you need please ask 🙏
In the video you can see the aim is OK but it always overshoots it

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timid dove
deft topaz
#

currentGravity is the absolute value of Physics.gravity.y, resulting in 9.81

#

As for the arguments such as targetPoint and originPoint; originPoint is the position of the cannon whereas targetPoint the position described by the red marker in the video, which is set randomly

#

Finally T is a float value currently set at 45, and initial angle has a value of 60º which gets converted into radians in the function

royal willow
#

use a mesh collider

winged summit
#

I'm making a fighting game in Unity 2D and I have a question, how do I make it so that, for example, when I jump over the enemy, it slides like in some games instead of falling and turning? (I put a video so you can understand what I want it not to do)

royal willow
timid dove
#

Probably best to make the train collider up out of a bunch of BoxColliders

winged summit
timid dove
#

Clearly it's not empty

#

If you have a CharacterController, that is itself a capsule-shaped Collider

sturdy plank
#

I'm having an issue with a simple obstacle that I am trying to create. The obstacle is just a box that rotates on its x-axis. The problem that I'm having is that if I center the player above the objects origin, I can just surf the box. I have tried parenting the player on collision, however despite the players Rigidbody rotation constraints being frozen, the player still rotates with the box. I'm using the Invector 3rd person controller if that makes a difference. This video from Super Mario Sunshine shows what I am trying to emulate: https://www.youtube.com/watch?v=sFc0rJYy7Mw. Any help with this would be greatly appreciated!

regal turret
#

Hello! I have a heavy lag spike for several seconds when I spawn 100 enemies at once. profiler says the physics 2d find new contacts is the problem. I don't get it, since I removed ALL possible collisions via collision matrix. What is the fix for this?

timid dove
# regal turret

if you removed "all possible collisions" then why do they need colliders at all?

regal turret
#

It's annoying and I need to find a solution. I faced this problem before but stopped attempting to find how to fix it.

#

I understand that I can hashset these enemies and use colliders bounds overlap technique, but I want to find out how to do it via physics first.

#

If it's possible to do 100 enemies or more via physics of course.

timid breach
#

i have this setup on a enemy, i am trying to make sure two enemies cant collide with each other

image.png
#

any idea whats wrong here

timid breach
#

I have unchecked same layer collision in physics2d in project settings, but it's still colliding

silver moss
timid breach
#

any idea what might be wrong

silver moss
#

Like if you have child colliders, check those too

#

Orher than that no idea, not familiar with these new layer settings

timid breach
#

only one collider

image.png
#

and this is the layer on both

#

i also tried using this using tags
it prints the debug that its ignoring collision but in game its not

image.png
timid breach
#

@silver moss any idea, what can I do?

silver moss
#

Could debug.log the colliders and their layers in OnCollisionEnter2D to confirm what is actually happening

#

Is this Unity 6 btw?

timid breach
#

Nope

#

2022

timid breach
#

Layer name specifically

silver moss
#

LayerMask.LayerToName

timid breach
#

I confirmed the collision layer to be enemy

timid dove
timid breach
#

@timid dove any insight?

timid dove
#

This one seems different

#

Is that first one an enemy? or the player?

timid dove
# timid breach

because if these are the enemies, there's nothing here stopping it from colliding with another enemy.

timid breach
#

how can i make sure they dont collide with each other

timid dove
#

Either use the layer collision matrix in physics 2d settings, or add the Enemy layer to the "Exclude Layers" dropdown on the Enemy object's Rigidbody2d OR Collider2d

timid breach
timid dove
timid dove
timid breach
#

yes this is after i did exclusion in script

timid dove
#

Why do it in script?
Also how do we know 3 is the correct layer?

timid breach
#

same problem, still colliding

image.png
timid breach
timid dove
timid breach
#

@timid dove i tried disabling same layer collision in collision matrix of physics2d as well

timid dove
timid breach
timid dove
#

we want both

timid breach
#

base is ground i suppose

timid dove
#

so what's the issue?

timid breach
timid dove
# timid breach

you should fix these logs so we can actually tell what's going on

#

print both in one line

# 
Debug.Log($"{col.otherCollider} collided with {col.collider}");```
timid breach
#

damn now nothing is printing

timid dove
#

Well which object is the script attached to

timid breach
#

orbix with enemy script

image.png
timid dove
#

This stuff^

timid breach
#

this is separate

#

i have collisions turned on in project settings

timid dove
#

It's very suspect that this is part of the eyeball character

timid breach
#

no i can assure you its not, its on a completely different game object

timid dove
#

I see

timid breach
#

here so i its not colliding with other enemy but they are still blocking each other

image.png
timid dove
timid breach
#

its a PhysicsObject Script

timid dove
# timid breach

Show the full script.

But from this small snippet it looks like it's manually doing raycasts on the sides to detect obstacles.

If you show the rest we can probably see that it uses these raycast results to decide to move or not

#

So the problem has nothing to do with actual physics collisions

#

your movement script here is doing raycasts to determine when it can and can't move

#

so the fix would be to use an appropriate layermask with these raycasts

#

Also - in the future, when you share code, please use this: !code

flint portalBOT
timid breach
timid dove
#

What is PhysicsObject?

#

share that script too

timid breach
#

@timid dove i figured it out

#

thanks for being patient with me

silver moss
#

I had a suspicion that you are doing collision checks manually, I should've clarified more than asking "How is it moving? Rigidbody?" 😬

timid dove
abstract prawn
#

I have a very challenging design problem I've been facing for a while, and I was wondering if anyone has any ideas how to implement this.
Effectively, I need a player to be able to move its rigidbody freely atop a makeshift conveyor belt. The challenge:

1.) The rigidbody doesn't actually make contact with the terrain, since the player actually hovers above the ground, so I can't rely on friction to do the job.
2.) Adding a flat velocity every frame won't work because that compounds over time and causes acceleration.
3.) I can't manually set the velocity to the rate of the conveyor belt since I want the player to be able to move atop the belt.

image.png
timid dove
#

The rigidbody doesn't actually make contact with the terrain, since the player actually hovers above the ground, so I can't rely on friction to do the job.
I don't understand this part.

but the standard way to do a conveyor belt is, make the belt kinematic and do something like this:

Vector2 startPos;
Rigidbody2D rb;
Vector2 velocity = new (1, 0);

void Start() {
  startPos = rb.position;
}

void FixedUpdate() {
  Vector2 movement = velocity * Time.fixedDeltaTime;
  rb.position = startPos - movement;
  rb.MovePosition(startPos);
}```
abstract prawn
timid dove
#

Although preventing snagging seems like perhaps something that could be solved in other ways

#

but what I mean by friction-at-a-distance is that basically you would apply forces to the player similar to a friction force. i.e. if the velocity of the player is different from the velocity of the belt, you apply a force to the player in the direction of the difference between their velocities - proportional to said difference

#

i.e. if the player is travelling at the same speed as the belt, no force is needed

abstract prawn
abstract prawn
#

The best approximate solution I have right now is by moving a parent of the rigidbody while it's over the conveyor so the rigidbody receives that steady additional speed by inheritance

#

Then when it exits the conveyor, I add a little momentum to the rigidbody to give the illusion of the belt imparting momentum

#

The problem with this is that jumping on and off the conveyor causes a speed boost every time you jump off

#

This is a shockingly complex little puzzle to me

timid dove
abstract prawn
#

Player has a top speed; accelerating will add speed in the forward direction until top speed is met

#

So given that, even with friction I'd have that to contend with I suppose

#

Which means moving the parent is probably the only logical thing to do

#

So it's pretty much figuring out how to apply the momentum on dismount that doesn't accrue when you jump up and down on the conveyor?

timid dove
#

you have this arbitrary top speed. Really when you're on the conveyor belt your arbitary top speed needs to account for that

abstract prawn
#

I suppose that's true, figuring out how to adjust the top speed according to the direction you're facing is interesting

#

Your top speed should also be less moving opposite the direction of the conveyor

#

Probably a dot product or something

timid dove
# abstract prawn Probably a dot product or something

it's not even that complicated. Just subtract the "velocity" of the surface below you from your current velocity, then do the max speed calculation.

i.e.

Vector2 velocityOfTheGround = Vector2.zero;
// do a raycast down
// if we hit conveyor belt then...
velocityOfTheGround = conveyorSpeed;

Vector2 currentSpeed = rb.velocity;
Vector2 relativeSpeed = currentSpeed - velocityOfTheGround;
float magnitude = relativeSpeed.magnitude; // or just check.x if you want only that
// apply speed limit
Vector2 clampedSpeed = LimitMySpeedHowever(relativeSpeed);
Vector2 newSpeed = relativeSpeed + velocityOfTheGround;
#

something along these lines

abstract prawn
#

Oh yeah! That is less complicated, thank you

#

I think this solution will work well!

timid dove
#

I have a player with a Character controller
You mean Unity's built in CharacterController component?

#

Or something else?

#

Because CharacterController is 3D-only

#

i tryed multiple OnCollision/Ontrigger methods.
Which ones? You may not have tried the correct ones.

#

then yeah you're trying to mix 3D and 2D physics

#

They do not interact.

#

Use a CapsuleCast or BoxCast solution. Check with a Box/CapsuleCast before moving your character and only move as far as you can based on the cast results

#

Lots of people have written them. Usually using a kinematic rigidbody2d and a solution like what I just mentioned with CapsuleCasting

#

But there is no direct equivalent component built in to Unity, no.

#

easier solution than what

#

Your options are:

  • Find one someone else made
  • Write your own
#

casting is easy though

#

so I'm not sure what the hangup is there

#

I don't understand, no

#

That's how CharacterController works

#

it does CapsuleCasts every time you move

#

But again

#

feel free to find a script someone else made.

#

there are hundreds/thousands of them

#

Another option I guess is use a Rigidbody-based controller with velocity and set your player's mass to 0

#

I thouyght you said you didn't want other things to get pushed

#

then you want a kinematic controller with capsulecasts

timid breach
# 
//Check for left ledge!
leftLedgeRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x - rayCastOffset.x, transform.position.y + rayCastOffset.y), Vector2.down, rayCastLength);
Debug.DrawRay(new Vector2(transform.position.x - rayCastOffset.x, transform.position.y + rayCastOffset.y), Vector2.down * rayCastLength, Color.green);
if (leftLedgeRaycastHit.collider == null) direction = 1;

// Check for right wall
RaycastHit2D rightWallRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x, transform.position.y + rayCastOffset.y), Vector2.right, rayCastLength, rayCastLayerMask);
Debug.DrawRay(new Vector2(transform.position.x, transform.position.y + rayCastOffset.y), Vector2.right * rayCastLength, Color.red);

if (rightWallRaycastHit.collider != null)
{
    direction = -1;
    Debug.Log("-1");
    Debug.Log("Collided with: " + rightWallRaycastHit.collider.gameObject.name);
}

// Check for left wall
RaycastHit2D leftWallRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x, transform.position.y + rayCastOffset.y), Vector2.left, rayCastLength, rayCastLayerMask);
Debug.DrawRay(new Vector2(transform.position.x, transform.position.y + rayCastOffset.y), Vector2.left * rayCastLength, Color.magenta);

if (leftWallRaycastHit.collider != null)
{
    direction = 1;
    Debug.Log("1");
    Debug.Log("Collided with: " + leftWallRaycastHit.collider.gameObject.name);
}

i have this code where i am using raycast2d to detect the walls and also the other enemies, but since enemies are on same layer called enemies, the raycasts are detecting the object itself and changing direction continuously

timid dove
# 
int oldLayer = gameObject.layer;
gameObject.layer = Physics2D.IgnoreRaycastLayer;

// do your raycasts here...

gameObject.layer = oldLayer;```
timid breach
#

Physics2D.IgnoreRaycastLayer

do i put a layer instead of this

timid dove
#

That is a layer

#

although actually seems like it's a mask not a layer

#

so yeah, put whatever layer you want

#

as long as it's a layer that isn't in the layermask you're using

timid breach
# timid dove That is a layer

can you guide me how can i add this raycast2d as child of an empty that is on IgnoreRaycastLayer so that i dont need to put whole gameObject on that layer

#

like do i create gameobject in the script as well or do i refer it using serializefield

timid dove
#

You definitely don't want to "create a GameObject"...

timid breach
timid dove
#

what does Update have to do with anything

timid breach
#

wont it keep changing the layers

timid dove
#

Is that a problem for some reason?

#

the code changes the layer back when it's done

#

so it won't be visible to anything

timid breach
#

damn, it really worked

#

you are a real one

wintry pollen
#

I don't think I can chat there lol

wintry pollen
manic fractal
#

Guys I am a rookie here just wondering if I can dynamically change material for line render based on some conditions

silver moss
manic fractal
ashen swift
#

my guy's arm keeps coming apart

Screenshot_2024-03-26_144435.png
#

it gets fixed when i uncheck freeze positon x and y

#

but then the arm doesnt stay on the joint and rotates retardedly

devout veldt
#

Hey guys, i'm having some weird behaviors with 2 rigidbodies of the same mass.
I have a little script that throw them at the same force, but the canon is sent like the mass doesn't matter, could you help me pls ?

Shynx 🙂

image.png image.png
timid dove
#

One possibility to check for is:
Is one or the other of the objects colliding the the player or something else as it's being thrown?
You can check this with a Debug.Log inside OnCollisionEnter

devout veldt
# timid dove show the code and the inspectors of the objects?

The code only apply a force on the throw event in the animation, i gave you the inspectors of the objects already.
I only have this strange behaviors with the canon, all the other items works correcly.

On the throw i simply teleport the object at the hand possition and i set a collision ignore in the item rigidbody so he doesn't collide with the player collisions

timid dove
devout veldt
#

I'm running a test for the collision 🙂

timid dove
#

Also - do all such objects have NetworkTransforms etc? Maybe networking is causing an issue

#

Who is throwing this thing? The host? The server? A client? What's the network topology

devout veldt
#

I don't think so because it's the same struct for every objets, and the canon is the only one with the behavior

timid dove
#

My thoughts are that the main difference is the shape of the colliders

#

which may contribute to an unexpected collision somewhere

#

I also note there's a difference in collision detection mode on the Rigidbody

devout veldt
timid dove
#

I'm not sure then!

devout veldt
#

Can it have something to do with the 3D object ?

timid dove
#

try it and see

#

why kinematic though?

#

i forgot that 2D kinematic bodies can move with velocity

#

3D cannot

royal willow
#

so it only travels? travels in a certain direction only?

#

wdym by that

#

if your goal is to make it travel in a certain direction only and just delete it on inpact i would use translate()

timid dove
#

Letting the RIgidbody2D move it is much better than using Update and manually moving it

royal willow
#

i thought not having colliders or a rigidbody would increase performance?

timid dove
#

because the physics engine is native code and highly parallelized

royal willow
#

well if you didnt use the rb or any colliders that would increase performance?

timid dove
#

but then how do you do collision detection?

#

you need to say what you're comparing to

#

also no again, moving the objects all manually with Update is going to be super slow

royal willow
#

or a trigger

timid dove
#

🤔

#

those only detect colliders

royal willow
#

you just detect other colliders

timid dove
#

So now you're manually doing hundreds of overlapSphere calls?

#

in Update?

#

this is not going to be faster

#

now you're just trying (poorly) to recreate the spatial acceleration data structure that the physics engine already has built into it

#

which will be so much more optimized than anything you will ever write

#

I'm saying it's better than whatever manual collision detection scheme you are cooking up

#

everything has limits. You need to test on your target hardware to see what yours are

#

I'm not going to answer only with yes or no

#

of course you can do that

#

you will have to test if it is performant enough or not

#

thoise things exist for a reason - to be used

#

if you're satisfied why would you do something else

#

look into ECS

#

look into the job system.

royal willow
#

unless the physics system is just that optimized, if thats the case then i would prefer that then

timid dove
#

and yes the physics system is optimized for exactly this - detecting collisions quickly

royal willow
#

alright 👍

unique cave
# royal willow alright 👍

And triggers are far from optimized, in fact last time I heard, they can be significantly slower than collisions. Of course Triggers are optimized but the way they are implemented is suboptimal in some cases. If I remember correctly, every OnTriggerSomething method will check for the collisions independently and collisions are resolved as possible collision pairs in broad and narrow phases which makes it very fast

royal willow
unique cave
# royal willow okay

Lets say you wanted to detect collisions between a player and 100 enemies. Using OnTriggerEnter for each enemy would be slow while on the single player it would be much better. For collisions there's no such big difference where you are detecting the collisions

royal willow
still stone
#

@silver moss Hey there, only just saw your message over in #💻┃unity-talk .
I'm using Character Joints, I used the Ragdoll Wizard to generate it.

silver moss
#

Remind me what the issue was?

still stone
#

Weird deforming at fast speeds

silver moss
#

So did you try enabling projection?

still stone
#

Not as of yet, literally just woke up
I'm going through all of the joints now

silver moss
#

Also try enabling Enable Adaptive Force in the physics settings

#

IIRC that helps with stability of chained joints

still stone
silver moss
#

Should probably make a popup show up for the user if that setting is not enabled then

#

With the user I mean whoever uses your assetbundle, not the player

still stone
#

Gotcha

silver moss
#

Greater Default solver iterations could also help. Also in the physics settings

still stone
#

Enabling Projection still has a slight deformation, although it's insanely better!
Thanks for that 😄

silver moss
#

Could try a lower Projection Distance too

#

That's the max distance it can stretch out before it snaps back to place

still stone
#

Alright thanks I'll mess around with that a bit!

timid dove
# still stone

Do you happen to know which netcode solution plateup uses?

still stone
#

Uses Steam Matchmaking for the initial connection, from there it's custom P2P.

timid dove
#

got it thanks

#

I'm making a game inspired by PlateUp right now so I was curious 😄

ashen swift
dense remnant
#

Hi guys, I'm facing a problem with a collider. I'm making a game where the player is 2d, but the enviorment is 3d. I have a warship model, but for some reason, when I try to add a 2d collider to it, so the player can't collide, its facing the wrong direction. If you look in the screenshot provided, you can see the problem I'm facing. Hope someone knows a fix. Rotating it doesn't seem to work.

open quail
#

Hello all, I have a question about physics and collisions on simple primitive gameobjects.

I am currently on the Counting Prototype in the programming learning path for Unity.

They provide a cube that is made with basic primitive shapes and parented under a single gameobject.

Each of the walls of the cube, is a cube with its own collider and rigidbody.

The balls also have their own colliders and rigidbodies.

Everything is fine, the balls drop into the box and collect in the box. However, if I try to move the box using transform.position, or physics rb.AddForce(), the balls go through the walls of the box.

I have tried to set collision detection to continuous on all the walls and balls. I have tried to make the walls much bigger, and I have also made the balls much bigger. I have tried to set the box moveSpeed to be slower, but no matter what, the balls keep falling through the side walls when I move left or right with the box.

On the parent gameobject, of the box, there is a boxcollider set as a trigger, but even if I remove it, it doesnt help.

Can creating a box with multiple primitive cubes, cause craziness with collisions, and cause them not to work

image.png
timid dove
#

Although the settings on your bodies and the overall physics settings may play a part

open quail
timid dove
#

You will definitely not want to move via the Transform

open quail
#

Interesting. I was up all night, I went to bed so sad

timid dove
#

Showing how the collider(s) for the box are set up may also help

open quail
hardy tendon
#

I have an issue I can't quite grasp. I have a wall box made of box colliders 2d. I have ball with circle collider, max bounciness and a rigidbody2d with no material.
When the ball hits a wall the x velocity seems to be completly absorbed same for the top wall with the y velocity. Keeping the ball stuck in an up/down or left right loop. What could it be?

timid dove
hardy tendon
timid dove
unique cave
#

Could also be your script doing something wonky in case you use one to control the movement

hardy tendon
#

On both colliders, not on RBs

hardy tendon
silver moss
unique cave
hardy tendon
#

nope just _rigidbody.AddForce(...) when colliding with the player

silver moss
#

@dense remnant What is facing the wrong direction, the warship? You could just fix the model's rotation or put the meshrenderer on an empty child and rotate the child

unique cave
hardy tendon
unique cave
hardy tendon
#

ok brb

#

maybe was better a gif... sorry not that practical with video recording

silver moss
#

Save it as something like mp4 so it embeds here in discord

hardy tendon
unique cave
#

Only point where I saw some kind of absorption happen was when the ball hit the paddle at an angle. Where exactly the problem is?

hardy tendon
#

oh yes the other ball

#

that-s on the paddle side

unique cave
#

what about it?

hardy tendon
#

that could be one thing but it doesn-t explain this

#

the top wall completly absorbed the ball y velocity

#

and now is in an endless loop left to right

unique cave
#

I'm just confused as to what I'm supposed to see

hardy tendon
#

I drew in green the box of the game, the ball came from the bottom with a small angle on the x and somehow the wall fully absorbed the y velocity and now it's in an endless loop left to right

8755282D-B0EA-4985-A867-376ED5B58598.png
#

Sorry if Iàm not explaining perfectly

unique cave
#

That doesn't show in the video though

hardy tendon
#

Ill try to replicate the this example

hardy tendon
unique cave
hardy tendon
#

by bouncing off bricks

#

then hit the wall

#

(ceiling) and got completly "absorbed"

unique cave
#

Does it happen only sometimes?

hardy tendon
#

sometimes, probably when the angle is veeery tiny (probably)

unique cave
#

I don't really know what to say, sorry

#

I cannot really say I understand the issue well enough to suggest any concrete solutions or debugging steps

hardy tendon
#

😦

#

thanks anyway!

royal willow
#

you could use vector3.reflect if this is game is similar to pong

hardy tendon
#

its arkanoid so kinda similar

royal willow
#

it could also be something in your code resetting the velocity or the rigidbody getting stuck in the wall for a split second

#

does it happen with or without the physics material?

hardy tendon
#

with the material on both colliders

#

mind the wall has only collider, the ball has rb too with no material

royal willow
#

so when you do not have it, it doesnt act this way?

hardy tendon
#

always does it

halcyon knot
#

please help me basically my issue is that I have a gun in my game with a rigidbody compenet with Kinematics on but still when I move my camera, the gun just goes flying and doesnt follow the player. I know it has something to do with the rigidbody compoenent attacted to the gun because when I turn it off, it works fine

#

i fixed the solution was to set interpolate to none

dense remnant
timid dove
#

Physics OverlapSphere

#

You may get a small list of things and then you just iterate over it to find the closest

timid dove
#

Use a collider in what sense? Colliders are involved no matter what

silver moss
#

Trigger colliders or?

#

So collision.GetContact(0).thisCollider or it could've been otherCollider

#

Sure but does it have a rigidbody?

#

If yes, all collision messages will be sent to the object that has the rigidbody instead of the child object that has the collider

#

So you'd need to differentiate them anyway

#

As for triggers, IIRC you can't check which self trigger was hit, so it would need to be on a separate object
Edit: Just checked and Trigger messages get sent to both the collider and the rigidbody

#

Easiest way would be to put them on different children and give those children different scripts, have OnCollisionEnter on both of them

last hemlock
#

i think this is the right chat for this topic, but if not ill take it to a different one if needed, but can anyone help explain how to use wheel colliders correctly? cos so far they seem to be causing me more drama then help so far, and, from what i can gather, keep seeming to lock for some reason on start of play and i cant get them to roll freely, unless im doing something wrong with them?

#

ok i realised one mistake for them which i have fixed so far

#

but im still confused why they always lock up and wont budge no matter how much force i put into the object

dreamy crater
dreamy crater
hasty forge
dreamy crater
hasty forge
#

i "voted it off" my schedule

#

so that means i never really got past gravity, elecricity, light and soundwaves

dreamy crater
heady ocean
#

I cant seem to get my character to collide with the wall and I've tried changing the sorting layers messing around with the tilemap collider and the rigidbody and the boxcollider2d but nothings really working.

image.png
timid dove
#

You would need to be moving it via physics to get collisions

heady ocean
#

im just using a grid based movement script

timid dove
bitter haven
#

https://www.youtube.com/watch?v=qdskE8PJy6Q&ab_channel=ToyfulGames
So, my bro and I are trying to figure this out.

We've managed to make moving around and jumping somewhat stable. But we've run into a snag.

Player-Input rigidbody forces and outside rigidbody forces are both being decelerated by the speed cap. And we want to make it so that that doesn't happen for outside forces.

YouTube
Toyful Games
Making A Physics Based Character Controller In Unity (for Very Very...

A detailed look at how we built our physics-based character controller in Unity for our game Very Very Valet - available for Nintendo Switch, PS5, and Steam
BUY NOW!! https://toyful.games/vvv-buy

~ More from Toyful Games ~

▶ Play video
ashen swift
#

how do u stop freeze position x and y from freezing in global space

#

and only in local space

#

cuz my guy's arm keeps coming apart

empty matrix
#

Is there a way to make a triangle collider besides a mesh collider?

image.png
silver moss
empty matrix
silver moss
#

Whats wrong with meshcollider?

#

If you are concerned about performance, its not bad at all when it comes to static objects

inner thistle
#

You can make a simplified mesh and add a mesh collider to that instead of the actual roof object

empty matrix
silver moss
#

Thats why you use a simplified mesh like Nitku mentioned

#

Or at least set the meshcollider to convex so it doesnt have holes

#

Although I dont understand the second part of you message 🤔

#

Do you need accurate collisions or no? You want holes or no?

empty matrix
silver moss
#

Sorry but I dont understand or see the issue with that

empty matrix
silver moss
#

Can you show a screenshot of that

#

And the inspector of the mesh collider

empty matrix
silver moss
#

Uncheck "convex" if you want to have physical holes

empty matrix
silver moss
#

Really!

#

It will make the collider invisible in the editor but thats because you have the same mesh on the mesh filter

empty matrix
olive fern
short bolt
#

Are WheelJoint2D useable? They don't seem to make sense, they float around like balloons and don't seem to behave like wheels

wispy hemlock
silver moss
wispy hemlock
silver moss
#

This includes playerRoot.Translate and possibly playerRoot.Rotate (which might not be a problem on a capsule)

wispy hemlock
#

Any suggestions? 😕

silver moss
#

Use the rigidbody to move it. velocity or AddForce

wispy hemlock
#

Okay, thank you.

wispy hemlock
#

Is there any kind of calculation for figuring out necessary 'jump force' ?

silver moss
#

Usually its a predefined amount of force

wispy hemlock
silver moss
#

Or do you want to calculate jumping from position A to B?

#

Aight

wispy hemlock
# 
jumpForce = Mathf.Sqrt(requiredJumpHeight * (Physics.gravity.y * 1) * -2) * playerRigidBody.mass;
playerRigidBody.AddForce(jumpForce * playerRoot.up, ForceMode.Impulse);

Pretty cool. Give it a required jump height and it works everything out based on your rb settings.

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Okay, I've had a look around, but tbh I'm not 100% sure what I should look for. I have 4 objects raycasting to the ground on each corner of my vehicle. How can I get a rotation value based on the heights of those raycast hit points? I think the thing I need to look at is dotproduct?

silver moss
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But yeah the cross prodct should be pretty simple:cs var backFront = frontWheel - backWheel; var leftRight = rightWheel - leftWheel; var cross = cross(backFront, leftRight);
Something along those lines

wispy hemlock
silver moss
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It doesn't give you a point, it gives you a direction that would point upwards relative to the wheels if you do it right

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f = front, b = back

image.png
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The blue lines are the vectors you put into Vector3.Cross. Green is the result

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If you want to include all 4 wheels then you need to do it twice and maybe Slerp between those two cross products

wispy hemlock
silver moss
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Yes

wispy hemlock
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Awesome. Thank you very much 🙂

wispy hemlock
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Haven't tested yet. But does this look about right?

Vector3 frontLR = FL - FR;  //Front Left - Front Right;
Vector3 rearLR = RL - RR;   //Rear Left - Rear Right;
Vector3 crossLeftRight = Vector3.Cross(frontLR, rearLR); // Left to Right (Front & Back)

Vector3 leftFR = FL - RL;  //Front Left - Rear Left
Vector3 rightFR = FR - RR; //Front Right = Rear Right
Vector3 crossFrontBack = Vector3.Cross(leftFR, rightFR);  // Front to Back (Left & Right)

Vector3 crossFull = Vector3.Cross(crossLeftRight, crossFrontBack);

vehicleRotation = Quaternion.Euler(crossFull);
silver moss
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Nah, for the cross you need to give perpendicular directions, not colinear directions

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So a sideways vector and a front-back vector

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And this is nonsense: cs vehicleRotation = Quaternion.Euler(crossFull);
A direction doesn't work as an euler angle. Maybe you want LookRotation combined with something

wispy hemlock
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Right okay, I think I get it (just had another look at your example). and of course it's nonsense. lol. Sorry. Getting a bit late for me so a bit tired. Thank you for taking the time to help. Think I'm going to call it a night and come back to it in the morning 🙂

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Just really quickly sorry, just so I've got it straight in my head.

Green = 1st cross
Red = 2nd cross?

image.png
silver moss
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Yep

wispy hemlock
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Awesome. thanks 🙂

silver moss
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Oh and the crossfull part in your example wont work

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Just do Vector3.Slerp(crossA, crossB, 0.5f) to get an average

wispy hemlock
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Ah, gotcha.

fast thistle
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This is a good place to ask about Quaternions, right?

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I have a series of rotation transformations q1*q2*q3=Q , and I want to get Q^-1. To calculate that, I just have to invert the order and invert each of the quaternions, correct? So Q^-1=(q3^-1)*(q2^-1)*(q1^-1), correct?

fast thistle
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I have a series of rotation

cosmic mica
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Hello, I've been having problems with Rigidbody.SetDensity(float density)
It does internally change the mass for the physics simulation (reacts to forces appropiately), but the Rigidbody.mass property remains unchanged, so defeats the purpose if you want to use the resulting value.

Does this happen to anybody else?
PD: unity should really expose the internals they use to compute a rigidbody/compoundcollider volume...

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PD2: this happens both in Unity 2021 and Unity 6

narrow pier
# cosmic mica Hello, I've been having problems with Rigidbody.SetDensity(float density) It doe...

Unity most certainly simply uses some PhysX API to calculate RB's mass on basis of density.
If you're advanced enough, look at PhysX source code.
In this extensions file (https://github.com/NVIDIA-Omniverse/PhysX/blob/19542b61c4fee8e5aaa97f10455933488383d092/physx/source/physxextensions/src/ExtRigidBodyExt.cpp) you can refer to computeMassAndInertia and updateMassAndInertia methods or others that are considering density in their calculations. And of course search through the PhysX docs.

GitHub
PhysX/physx/source/physxextensions/src/ExtRigidBodyExt.cpp at 19542...

NVIDIA PhysX SDK. Contribute to NVIDIA-Omniverse/PhysX development by creating an account on GitHub.

cosmic mica
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Will do!

dull adder
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I have a 3D voxel array, how do I create a collider for the voxels?

silver moss
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And some meshing algo like "greedy meshing"

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There's a lot of resources on this stuff online

dull adder
silver moss
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I was assuming it's voxel terrain, not a dynamic rigidbody object

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How accurate collisions do you need? I guess you could use box colliders. Greedy meshing would be handy there too