Instantiate variable, Null Reff

Questions & Answers
1

I am having problems with my instantiate variable. This is from my “GameHandler” script, that is instantiating a turret pod on button down and turns off the gravity on its rigid body. Then on button up, I would like to turn on the gravity on the turret pod. Getting null reff error from the second newTurretPod variable under the GetButtonUp statement. Here is my code:

function Update ()
{
  if(Input.GetButtonDown("Fire1"))
    {
      var newTurretPod = Instantiate(turretMisslePod, summonObjectPos.position, summonObjectPos.rotation);
      newTurretPod.GetComponent(TurretPod).GravityOff();
    }
    
  if(Input.GetButtonUp("Fire1"))
    {
      newTurretPod.GetComponent(TurretPod).GravityOn();
    }
}

If I am not able to do this, another method would be nice. Also I want it in my game handler script cause I wish to put all my button statements in that script and not get confused when I finish implementing the rest.

Thank You: james

2

Your problem is on line 5:

 var newTurretPod = Instantiate(turretMisslePod, summonObjectPos.position, summonObjectPos.rotation);

You’ve declared ‘newTurretPos’ within the scope of Update(). This makes it a local variable to the function. It loses it value between calls to Update(), and you will not have a GetButtonDown() and GetButtonUp() in the same frame. You need to put the ‘newTurretPod’ variable at the top of the file:

 private var newTurretPod : TurretPod;

And you need to remove the ‘var’ on line 5.

3

Well I am going to have to answer one of my own questions again…

The problem was setting a new variable up top like robertbu said but with :

private var newTurretPod : GameObject;

Not:

private var newTurretPod : TurretPod;

Then you have to remove the var from:

newTurretPod = Instantiate(turretMisslePod, summonObjectPos.position, summonObjectPos.rotation);

This is my script with these elements to make this work:

var turretMisslePod : GameObject;
var summonObjectPos : Transform;

private var newTurretPod : GameObject;

function Update ()
{
  if(Input.GetButtonDown("Fire1"))
    {
      newTurretPod = Instantiate(turretMisslePod, summonObjectPos.position, summonObjectPos.rotation);
      newTurretPod.GetComponent(TurretPod).GravityOff();
    }
    
  if(Input.GetButtonUp("Fire1"))
    {
      newTurretPod.GetComponent(TurretPod).GravityOn();
    }
}

“TurretPod” is the name of the script that is attached to the object that is getting Instantiated.

“GravityOn() & GravityOff()” are the functions inside the TurretPod script that this script is calling.

Hope this helps someone

James