How do you convert an object to a transform?

Question

Hi (and thanks)

I have a game where various objects orbit a planet. The following script is attached to the planet and I would like it to find all objects with tag rather than object name. Is there an elegant way to achieve this?

Currently the errors which appears are:

FindGameObjectWithTag can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene.

Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

UnityException: You are not allowed to call this function when declaring a variable.

Move it to the line after without a variable declaration.

If you are using C# don't use this function in the constructor or field initializers, Instead move initialization to the Awake or Start function. Planet..ctor () UnityEditor.DockArea:OnGUI()

 using UnityEngine;
 using System.Collections;
  
 public class Planet : MonoBehaviour
 {
     //private Transform GameObjectPlayerStart;
     //private Transform GameObjectPlayerGamePlay;
     private GameObject GameObjectPlayerStart = GameObject.FindGameObjectWithTag("GameObjectPlayerStart");
     private GameObject GameObjectPlayerGamePlay = GameObject.FindGameObjectWithTag("GameObjectPlayerGamePlay");
     public float gravitationalForce = 200;
     private Vector3 directionOfGameObjectPlayerStart;
     private Vector3 directionOfGameObjectPlayerGamePlay;
     private Transform b;
     private Transform c;
 
     void Start ()
     {
         directionOfGameObjectPlayerStart = Vector3.zero;
         directionOfGameObjectPlayerGamePlay = Vector3.zero;
         b = GameObjectPlayerStart.transform;
         c = GameObjectPlayerGamePlay.transform;
     }
 
     void FixedUpdate ()
     {
 
         directionOfGameObjectPlayerStart = (transform.position-b.position).normalized;
         GameObjectPlayerStart.GetComponent<Rigidbody2D>().AddForce (directionOfGameObjectPlayerStart*gravitationalForce);  
 
         directionOfGameObjectPlayerGamePlay = (transform.position-c.position).normalized;
         GameObjectPlayerGamePlay.GetComponent<Rigidbody2D>().AddForce (directionOfGameObjectPlayerGamePlay*gravitationalForce);   
         
     }
 }

Answer 1

So er... Two hours or so later and I (with a little help from the globalhypermeganet) have come up with a solution.

Posting it for anyone else who is trying to do something similar.

 using UnityEngine;
 using System.Collections;
 
 public class PlanetGravity : MonoBehaviour 
 {
     public float gravitationalForce = 344;
 
     private Vector3 directionOfGameObjectPlayerStart;
     GameObject[] players;
     
     void Start () {
         players = GameObject.FindGameObjectsWithTag("GameObjectPlayer");
         directionOfGameObjectPlayerStart = Vector3.zero;
     }
     
     void FixedUpdate () 
     {
         foreach(GameObject GameObjectPlayerStart in players) 
                 {
                 directionOfGameObjectPlayerStart = (transform.position-GameObjectPlayerStart.transform.position).normalized;
                 GameObjectPlayerStart.GetComponent<Rigidbody2D>().AddForce (directionOfGameObjectPlayerStart*gravitationalForce);  
                 }
     }
 }

How do you convert an object to a transform?

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