List or Array for Rays

Questions & Answers
1

How can I write a list or an array and add rays to it within the code? I tried this, but it couldn’t add the rays somehow. The console keeps saying (when play pressed) ‘NullReferenceExeption: Object reference not set to an instance of an object.’
Is there another way to do it?

 using System.Collections.Generic;
    
    public List  rays;
    
    void Update ()
    {
    downRay1 = new Ray(transform.position, -Vector3.up);
    		downRay2 = new Ray (new Vector3 (transform.position.x - 0.5f, transform.position.y, transform.position.z), -Vector3.up);
    		downRay3 = new Ray (new Vector3 (transform.position.x + 0.5f, transform.position.y, transform.position.z), -Vector3.up);
    rays.Add (downRay1);
    		rays.Add (downRay2);
    		rays.Add (downRay3);
    }
2

You must declare the List type (which may have been eaten by the UA formatter), and initialize it:

public List<Ray> rays = new List<Ray>();
 
void Update ()
{
   downRay1 = new Ray(transform.position, -Vector3.up);
   downRay2 = new Ray (new Vector3 (transform.position.x - 0.5f, transform.position.y, transform.position.z), -Vector3.up);
   downRay3 = new Ray (new Vector3 (transform.position.x + 0.5f, transform.position.y, transform.position.z), -Vector3.up);
   rays.Add (downRay1);
   rays.Add (downRay2);
   rays.Add (downRay3);
}