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Question by MasterN1 · Sep 26, 2017 at 01:12 PM · c#rigidbodygravityif-statements

Do something if position Y is 4. (C#)

l have a script that enables useGravity on trigger enter, which works fine. But l want it to disable useGravity if transform.position.y is 4.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class gravity : MonoBehaviour {
     private void Update()
     {
         if (transform.position == new Vector3(transform.position.x, 4, transform.position.z))
         {
             GetComponent<Rigidbody>().useGravity = false;
             Debug.Log("Gravitation Disabled");
         }
     }
 
     private void OnTriggerEnter(Collider other)
     {
         if(other.gameObject.name == "enGrav")
         {
             GetComponent<Rigidbody>().useGravity = true;
             Debug.Log("Gravitation Enabled");
         }
     }
 }

But it didn't work, and l have no clue why.

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Answer by wornTunic · Sep 26, 2017 at 01:41 PM

@MasterN1 First off, those Vector3-s won't be the same since they are two different objects, so you're comparing more than only x, y and z values. So, you should go with:

     if (transform.position.y == 4){
              GetComponent<Rigidbody>().useGravity = false;
              Debug.Log("Gravitation Disabled");
     }

Second, since Vector3 values are floats, getting the value to be exactly 4 is really a long shot, so you can do something like:

 if (transform.position.y > 3.9f && transform.position.y < 4.1f) {
                  GetComponent<Rigidbody>().useGravity = false;
                  Debug.Log("Gravitation Disabled");
 }

And third, just to make it easier to work with, you can define some offset for that, like this:

 public float offset = 0.1f;

And use it:

 if (transform.position.y > (4 - offset) && transform.position.y < (4 + offset) ) {
                  GetComponent<Rigidbody>().useGravity = false;
                  Debug.Log("Gravitation Disabled");
 }
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avatar image NoseKills · Sep 26, 2017 at 02:44 PM 0
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The first point you make is not entirely accurate, though the sentiment is right. Actually I didn't know either that == between Vector3s has a built in tolerance o.O

https://docs.unity3d.com/ScriptReference/Vector3-operator_eq.html

Also worth noting is that when comparing the equality of value types like Vector3, there is a reason why it doesn't make sense to expect reference equality

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3

Answer by Bilelmnasser · Sep 26, 2017 at 01:41 PM

Hello, First if you want to check only the Y value please be simple to do like this

     if( transform.position.y == 4.0f)
     {
     }

sencond , transform.position.y == 4.0f will maybe not be true in any of all your game Frames so it's not accurate to happen as a condition maybe use :

  transform.position.y >= 4.0f
 
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