NullReferenceException Error by Instantiating

Hi all,

Code (CSharp):

1. public class Particle : MonoBehaviour
2. {
3.  
4.     public double[] position;
5.  
6.     public Particle(double[] pos)
7.     {
8.         this.position = new double[pos.Length];
9.         pos.CopyTo(this.position, 0);
10.  
11.     }
12. }
13.  
14. public class test1 : MonoBehaviour
15. {
16.  
17.  
18.     public Particle particle;
19.     public Particle clone;
20.     void Start()
21.     {
22.  
23.         double[] tmp = new double[] { 0, 0, 0 };
24.         particle = new Particle(tmp);
25.         clone = (Particle)Instantiate(particle, this.transform.position, this.transform.rotation) ;
26.        
27.     }
28.  
29.     private void Update()
30.     {
31.         Debug.Log(clone.position);
32.     }

So I am trying to instantiate a sphere to use it as my Particle class. However when I am trying to read the position of the instantiated clone. It seems that the particle in the Instantiate() is equal to null. So the NullReference error occurs. But why? particle is created in the previous line with new Particle.

 

The error says that particle from line 24 is null. But to me it doesnt make sense, since I created with new Particle...

 

You can't new up a Particle because it is a Monobehavior. You need to create a GameObject first, then use .AddComponent<Particle>() to add it to that GameObject.

If you want to add it to the same GameObject that test1 is on, just use the this.gameObject property to call AddComponent and get back your reference to a Particle.

In any case, at that point it would already BE instantiated and not need further instantiation, unless you wanted to make more copies of it.

ALSO, I recommend not using the word Particle for your class: it is already a sealed class in Unity3D so you are going to confuse yourself and future people:

https://docs.unity3d.com/ScriptReference/ParticleSystem.Particle.html