Lerp or Lagging Constraint | Official Unity Discord | Page 1

pure solar Feb 10, 2022, 9:43 PM

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i'm having trouble getting my head around this right now

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how would i go about updating the position of the light and the player every frame?

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and in what format?

sharp rose Feb 10, 2022, 9:44 PM

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are you using transform.position to move your player?

pure solar Feb 10, 2022, 9:44 PM

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the player movement is just rb.AddForce whenever the player inputs something

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rb being Rigidbody ofc

sharp rose Feb 10, 2022, 9:46 PM

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ok so then I think that you can put lerp in your update method to make it move the light each frame

pure solar Feb 10, 2022, 9:47 PM

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in the script for controlling the ball i presume?

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ill try putting something together and see how it works

sharp rose Feb 10, 2022, 9:47 PM

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actually the lerp should be in a script on the point light

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I'm not sure if this will help much, but this is kinda what I would do

void Update()
{
    transform.position = Vector3.Lerp(transform.position, player.transform.position, 0.5f);
}

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ignore discords formatting lol

pure solar Feb 10, 2022, 9:52 PM

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hmmm

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just that alone seems to make the light follow the player exactly

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and at the same point as the player

sharp rose Feb 10, 2022, 9:53 PM

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mabye try increasing the 0.5f, I just used that as an example, but it could probably be quite a bit bigger

pure solar Feb 10, 2022, 9:54 PM

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no change

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{
    public GameObject player;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        transform.position = Vector3.Lerp(transform.position, player.transform.position, 5f);
    }
}

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current script for the light, just in case ive made some obvious mistake

sharp rose Feb 10, 2022, 9:55 PM

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hmm, I'm not really sure, just trying something random here but mabye the number needs to be small

pure solar Feb 10, 2022, 9:56 PM

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there's no additional constraints or anything on the light

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okay, ill give it a go

sharp rose Feb 10, 2022, 9:56 PM

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sry it's been a really long time since I've used that

pure solar Feb 10, 2022, 9:56 PM

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np, that still didnt seem to work though

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in the documentation it seems to require an "interpolation ratio"

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but i guess it isnt really important since you can just input any float so i dunno

sharp rose Feb 10, 2022, 9:58 PM

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hang on, I have an object with that function, I'm just gonna mess around with it a bit and see if I can figure something out

pure solar Feb 10, 2022, 9:58 PM

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alright, much appreciated

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worst case scenario i can just use a parent constraint with lower weight and move the light to the middle of the level or something

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will have a somewhat similar effect albeit not as cool

sharp rose Feb 10, 2022, 10:02 PM

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wierd, for me, I put it to a really small number like .05f and it seems to be working

pure solar Feb 10, 2022, 10:02 PM

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that's what i currently have it at

sharp rose Feb 10, 2022, 10:03 PM

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also I don't know if it makes a difference, I tried them both and they both seem to work for me, but I noticed that I was originally using Slerp not Lerp

pure solar Feb 10, 2022, 10:03 PM

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ah

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well

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ill give it a try?

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no difference :(

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are you sure that's all you did? is there nothing in the script that you control your ball with?

sharp rose Feb 10, 2022, 10:04 PM

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sry, I really just don't understand why it's not working

pure solar Feb 10, 2022, 10:04 PM

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maybe im calling the position of the player wrongly ?

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:( thanks a lot for your help anyways

sharp rose Feb 10, 2022, 10:05 PM

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I notice that for player you have a gameobject and I just have the transform but that shouldn't be making a difference

pure solar Feb 10, 2022, 10:06 PM

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hm

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changing it to a transform makes it not follow the player at all lol

sharp rose Feb 10, 2022, 10:06 PM

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oh nvm

pure solar Feb 10, 2022, 10:08 PM

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wait

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actually

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maybe it is working

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wait nevermind, for some reason it slowed the ball down?

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i.e the player

sharp rose Feb 10, 2022, 10:10 PM

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oh that's wierd

pure solar Feb 10, 2022, 10:10 PM

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but that means it's having some effect

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ill try switching the transforms around

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nope, still slowing down the ball

sharp rose Feb 10, 2022, 10:11 PM

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is there mabye a rigidbody on the light?

pure solar Feb 10, 2022, 10:12 PM

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nope

sharp rose Feb 10, 2022, 10:12 PM

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ok

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is the light a child of the ball?

pure solar Feb 10, 2022, 10:12 PM

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nope, it's on it's own

sharp rose Feb 10, 2022, 10:13 PM

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nvm

pure solar Feb 10, 2022, 10:13 PM

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shame, i feel like it's close but i just dunno how it works

sharp rose Feb 10, 2022, 10:14 PM

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yeah I wish I understood it a bit better

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I doubt this is affecting anything, but kinda the only other thing I'm noticing is that mine is in LateUpdate() instead of Update()

pure solar Feb 10, 2022, 10:18 PM

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im surprised that that didnt work

sharp rose Feb 10, 2022, 10:18 PM

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I guess there are a few other differences that I didn't mention because mine is for a camera, but I'll just post all my code

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    public Transform followObject;
    public Transform lookAtObject;

    public float smoothFactor = 0.5f;

    public bool lookAtTarget;
    
    // Update is called once per frame
    void Update () {
        transform.position = Vector3.Lerp(transform.position, followObject.position, smoothFactor);
        transform.rotation = followObject.transform.rotation;

        if (lookAtTarget)
        {
            transform.LookAt(lookAtObject);
        }
    }```

pure solar Feb 10, 2022, 10:20 PM

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wow yea it really is that straightforward

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i wonder what ive done wrong

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    {
        Invoke("Lag", 0.1f);
    }
    void Lag()
    {
        transform.position = Vector3.Slerp(transform.position, player.transform.position, 0.5f);
    }```

sharp rose Feb 10, 2022, 10:21 PM

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it just doesn't make any sense to me because I can't figure out what's different

pure solar Feb 10, 2022, 10:21 PM

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i tried this but it didnt work either

sharp rose Feb 10, 2022, 10:21 PM

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sry what does Invoke do?

pure solar Feb 10, 2022, 10:22 PM

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it just calls whatever function is in quotes after a certain number of seconds

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Invoke("<function>", float)

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as far as i'm aware at least

sharp rose Feb 10, 2022, 10:22 PM

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ah ok that makes sense

pure solar Feb 10, 2022, 10:23 PM

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honestly even more confused that this didnt work

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once the game is started, the light takes a few frames to get constrained to the ball, but after that it stays with it

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and i have no idea what's going on in the background to cause that behaviour

sharp rose Feb 10, 2022, 10:25 PM

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it almost sounds like it's accelerating at the start, and then its speed never goes back down

pure solar Feb 10, 2022, 10:25 PM

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yeah but the speed matches the ball after that

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regardless of how fast it's moving

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but void Lag() shouldnt be running every frame so that shouldnt be possible, right?

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UnityChanDown

sharp rose Feb 10, 2022, 10:26 PM

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I honestly don't know any more lol

pure solar Feb 10, 2022, 10:27 PM

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yeah, gonna have to give up on this for now until inspiration strikes i guess

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thanks for fussing over this with me

sharp rose Feb 10, 2022, 10:27 PM

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ok

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it's so wierd, I tried to stick my function on a light and it is working just fine so I have no clue what's wrong

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hang on, I don't know if it's possible to do this, but could you like film it and show so I can see what's happening, because I just copy pasted your code in and it's working

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the one thing I'm wondering if it has anything to do with how the ball is moving

pure solar Feb 10, 2022, 10:44 PM

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sorry for seeing this so late

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that is so strange

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which bit of code did you copy exactly

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ive made a few changes so i need to stick it back in

sharp rose Feb 10, 2022, 10:44 PM

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public class LightLag : MonoBehaviour
{
    public GameObject player;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        transform.position = Vector3.Lerp(transform.position, player.transform.position, .05f);
    }
}```

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just the original code you posted only I changed that to .05f

pure solar Feb 10, 2022, 10:47 PM

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oops i had a video in the bg lol

sharp rose Feb 10, 2022, 10:49 PM

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sry did you record this, just making sure

pure solar Feb 10, 2022, 10:50 PM

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yeah, why?

sharp rose Feb 10, 2022, 10:50 PM

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oh I get what you mean that's what that voice is lol

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I wasn't sure if it was you talking about what was happening in the game or not

pure solar Feb 10, 2022, 10:50 PM

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oh haha

sharp rose Feb 10, 2022, 10:51 PM

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if you went into scene view instead of game view, does it look any different?

pure solar Feb 10, 2022, 10:51 PM

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nope, light follows the ball all the same

sharp rose Feb 10, 2022, 10:52 PM

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hmm, it just so wierd

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have you tried making the number even smaller?

pure solar Feb 10, 2022, 10:53 PM

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wait

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that actually fixed it lol

sharp rose Feb 10, 2022, 10:54 PM

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really?

pure solar Feb 10, 2022, 10:55 PM

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yep, light lags a bit behind now

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wow that is so strange

sharp rose Feb 10, 2022, 10:55 PM

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yeah! lol

pure solar Feb 10, 2022, 10:55 PM

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maybe our scales are just different? (even though all my stuff is just scaled to 1)

sharp rose Feb 10, 2022, 10:56 PM

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I guess that would make sense, I think my character is about 3 high

pure solar Feb 10, 2022, 10:56 PM

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hmm

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well now i want do something else, which is position constrain the light to be slightly above the ball

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and still have it be affected by this script

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but constraining seems to take priority

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right now the light stays perfectly at the ball but i want it to be above and behind (and a bit to the left)

sharp rose Feb 10, 2022, 10:58 PM

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if you look at how my other script works, you could use that

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it set's an offset at the start by figuring out where it is relative to the player and then instead of moving directly to the player, it moves to the players position + the offset

pure solar Feb 10, 2022, 10:59 PM

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🤔

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im not sure what you're doing in that script exactly

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is LookAt a unity thing?

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or something in your own script?

sharp rose Feb 10, 2022, 11:00 PM

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oh sry, you can ignore that part, that only applies to the camera

pure solar Feb 10, 2022, 11:00 PM

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oh i see

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ohhh i see

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so instead of following the ball it's following a constrained object

sharp rose Feb 10, 2022, 11:01 PM

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is a constrained object like a child object?

pure solar Feb 10, 2022, 11:02 PM

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yea

sharp rose Feb 10, 2022, 11:02 PM

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that would probably work to, I didn't realize that when I copied the code I left removed the offset part

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public Transform followObject;

public Vector3 cameraOffset;
public float smoothFactor = 0.5f;

// Use this for initialization
void Start () {
    cameraOffset = transform.position - followObject.transform.position;
}
    
// Update is called once per frame
void LateUpdate () {
    Vector3 newposition = followObject.transform.position + cameraOffset;
    transform.position = Vector3.Slerp(transform.position, newposition, smoothFactor);
}```

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their that includes what I meant by offset, but I think you could do a constrained object as well

pure solar Feb 10, 2022, 11:06 PM

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ok

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fantastic

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it's all working now

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thank you very much!!

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might also apply it to the camera to see how it looks

sharp rose Feb 10, 2022, 11:06 PM

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glad it worked!

pure solar Feb 10, 2022, 11:08 PM

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oh my god this is so much better

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thanks an absolute ton

sharp rose Feb 10, 2022, 11:09 PM

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np, really glad you like it

#Lerp or Lagging Constraint