Unity - Object reference is set in editor but isn't set in game

Question

I have a Unity project in which the door is set to the GameObject "Door". It is fine and set in the editor (i.e. when I'm not playing it), but as soon as I hit play, it turns to "None (GameObject)". My script uses the Rigidbody component of the door, but I access that through the script. Do I need to reference the Rigidbody component instead?

Why is it doing this?

using UnityEngine;

public class GameManager : MonoBehaviour {

    public GameObject door;

    void Start ()
    {
        door = GameObject.Find("Door1");
    }

    public void NextLevel () {
        Debug.Log("open");
        door.GetComponent<Rigidbody>().AddForce(0, 0, 500);
    }
}

Boris Li · Accepted Answer · 2018-08-28 09:25:10Z

2

It could be the lifecycle functions of the script overriding the reference. Try to attach the script in your question, if you couldn’t, check the Awake, Start, Update or FixedUpdate functions, if it is set back to null by typo.

edited Aug 28, 2018 at 9:25

answered Aug 25, 2018 at 11:28

Boris Li

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8 Comments

William Jones Over a year ago

Yeah, the script is overriding the reference. I see the problem now. Thanks!

Boris Li Over a year ago

Now I get to see your code, please note that 'GetComponent()' is a very slow process, assuming that your the 'rigidbody' of the 'door' won't change during the gameplay, it should be placed in 'Start()'.

William Jones Over a year ago

So I should make a variable referencing the rigidbody component and apply a force to that instead?

Boris Li Over a year ago

yes. Make a 'private Rigidbody doorRB' field in the class, then, in 'Start()', 'doorRB = door.GetComponent<Rigidbody>();'

William Jones Over a year ago

Thanks, that will help. Also, do you have any thoughts on this problem I have? - stackoverflow.com/questions/52017955/…

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