Question regarding accessing scripts of other gameObjects

Unity Engine
1

Hello, I am new to the forums but I have been tweaking with Unity since about a couple of months now.
I am more of a .NET, Programming guy and I was fascinated with Unity so dabbling in it and making my own littel projects to learn it.

I have the following question :

I have a camera and another gameObject (lets say a cube).
The cube has a script to auto rotate.
The camera has a GUI script attached to it with a button that says “explore”

On click of the button,
-the cube should come to the center of the screen, still rotating (which it does)

  • and it shuold enable another script that is placed on the cube (MouseOrbit) (this does not happen)

the following is the code for the MouseOrbit that I use :

var target : Transform;
var distance = 5.0;
var xSpeed = 125.0;
var ySpeed = 50.0;
var zSpeed = 50.0;

static var switchScript : boolean;

var xtransform = 0.000001;
var ytransform = 0.000001;
var ztransform = 0.000001;

private var x = 0.0;
private var y = 0.0;

private var a = 0.0;
private var b = 0.0;

@script AddComponentMenu("Camera-Control/Mouse Orbit")

function Start () {
    var angles = transform.eulerAngles;
    x = angles.y;
    y = angles.x;
	a = angles.y;
	b = angles.x;
}

function LateUpdate () {
    if (target  switchScript ) {
	
	var position = Input.GetAxis("Mouse ScrollWheel") * zSpeed * 0.02 + target.position.z;
       transform.position.z = position;
	   if( Input.GetMouseButton(1)) {
        x += Input.GetAxis("Mouse X") * xSpeed * distance* 0.02;
       y += Input.GetAxis("Mouse Y") * ySpeed * 0.02; 
	   
        var rotation = Quaternion.Euler(y, -x, 0);
       
        transform.rotation = rotation;
		}
		
		
		
    }
	
	
	if ( Input.GetAxis("Horizontal") > 0) {
	transform.position.x += xtransform;
	}
	if ( Input.GetAxis("Horizontal") < 0) {
	transform.position.x -= xtransform;
	}
	if ( Input.GetAxis("Vertical") > 0) {
	transform.position.y += ytransform;
	}
	if ( Input.GetAxis("Vertical") < 0) {
	transform.position.y -= ytransform;
	}
}

If you notice, I have a “switchScript” boolean value in there that I am trying to “switch on” by using the following line of code when I click the “explore” button.

On click of the explore button, the following function is called : you can see the line where it says :

otherScript = GetComponent(MouseOrbitWithSwitch); 
otherScript.switchScript = true

function IdAndLabelling() {

var endPoint2 = new Vector3 (0.0,0.0,0.0); 
rotatingCube.transform.position = Vector3.Lerp(startPoint, endPoint2, (Time.time - startTime) / durationOfMove);
otherScript = GetComponent(MouseOrbitWithSwitch); 
otherScript.switchScript = true;
}

The error I get is : NullReferenceException at the place where I am accesing this script. (possibly because the script I am trying to access is on another GameObject (the cube) and the script from where am trying to access is attached to the Main camera.

Any ideas???

2

I’m having a similar problem, except im trying to set a boolean to be the same as another boolean.

3

@ JIM Studios : did it work?? I am working on it today and will post the code if I get it figured out… but any help would be great!

4

My scipt works… I had to put them both on the same GameObject. So I suspect if we have to access the script on any other GameObject, we will have to access tghe gameObject first and then the script. I still dint try that though.

5

mine still isnt working, i have the script

var projectile : Transform;
var barrel1 : Transform;
var barrel2 : Transform;
var force = 100;
var canFire = boolean;
var turret : Transform;

var fireRate = .01;

function Update () {
	canFire = turret.gameObject.GetComponent("Turret").on;
	
	if (canFire == true) {
		if (Input.GetButton("Fire1")) {
			SendMessage("fire");
		}
	}
}

function fire () {
	var projectile1 = Instantiate(projectile, barrel1.position, barrel1.rotation);
	projectile1.rigidbody.AddForce(transform.up * force);
	yield WaitForSeconds(fireRate);
	var projectile2 = Instantiate(projectile, barrel2.position, barrel2.rotation);
	projectile2.rigidbody.AddForce(transform.up * force);
	yield WaitForSeconds(fireRate);
}

and

var Player : Transform;
var playerCam : Transform;
var canGetOn : boolean;
static var on : boolean;
var turretPoint : Transform;
var turretCam : Transform;

function Awake () {
	if (Player == null  GameObject.FindWithTag("Player"))
	Player = GameObject.FindWithTag("Player").transform;
	
	if (playerCam == null  GameObject.FindWithTag("MainCamera"))
	playerCam = GameObject.FindWithTag("MainCamera").transform;
	
	turretCam.camera.enabled = false;
}

function Update () {
	if (Vector3.Distance(turretPoint.position, Player.position) > 1) {
		canGetOn = false;
	}
	
	else if (Vector3.Distance(turretPoint.position, Player.position) < 1) {
		canGetOn = true;
	}

	
	if (on == true) {
		Player.position = turretPoint.position;
		Player.GetComponent(CharacterMotor).enabled = false;
		Player.GetComponent(MouseLook).enabled = false;
		playerCam.GetComponent(MouseLook).enabled = false;
		turretCam.camera.enabled = true;
		playerCam.camera.enabled = false;
		transform.GetComponent(MouseLook).sensitivityX = 5;
		
		if (Input.GetButtonDown("Getin")) {
			on = false;
		}
	}
	
	else if (on == false) {
		Player.GetComponent(CharacterMotor).enabled = true;
		Player.GetComponent(MouseLook).enabled = true;
		playerCam.GetComponent(MouseLook).enabled = true;
		turretCam.camera.enabled = false;
		playerCam.camera.enabled = true;
		transform.GetComponent(MouseLook).sensitivityX = 0;
		
			
		if (canGetOn == true) {
			if (Input.GetButtonDown("Getin")) {
				on = true;
			}
		}
	}

}

function OnGUI () {
	if (canGetOn == true  Screen.lockCursor == true  on == false) {
		GUI.Box (Rect (Screen.width / 2 + 60, Screen.height / 2, 105, 30), "Press E to get on");
	}
	else if (on == true  Screen.lockCursor == true) {
		GUI.Box (Rect (Screen.width / 2 + 60, Screen.height / 2, 115, 30), "Press E to get off");
	}
}

and it isnt working

6

are both scripts attached to the same GameObject?

7

Try this…

in the second script where you have the GUI to switch on or off,

paste the following code :

otherScript = GetComponent(<scriptname>); // get the object and then the script
otherScript.canFire = true;