Referencing booleans from settings

Questions & Answers
1

I have a scene in my game where an image shows up on screen. However, there are multiple images and the user selects which one he/she wants in the settings scene. I have two scripts dealing with this, ScaryImageScript (which instantiates the image) and ScaryImageChoice(which decides which image to use). To do this, I am using booleans. I only have the script for my first image ( I have two others), but want to run this before doing the others. I have tried looking at the documentation and other examples where GetComponent is used, but I don’t feel that I grasp it yet. The console is telling me “NullReferenceException: Object reference not set to an instance of an object
ScaryImageScript.Start () (at Assets/ScaryImageScript.js:16)”
I am copying the example of accessing scripts from this Unity tutorial

I think the error has to do with my trying to access a boolean. Thank you for the help. Here is my code.

ScaryImageChoice.js

#pragma strict
 

var startingscaryimage1bool : boolean = true;
var startingscaryimage2bool : boolean = false;
var startingscaryimage3bool : boolean = false;

var scaryimage1bool : boolean;
var scaryimage2bool : boolean;
var scaryimage3bool : boolean;

function Start () {
scaryimage1bool = startingscaryimage1bool;
scaryimage2bool = startingscaryimage2bool;
scaryimage3bool = startingscaryimage3bool;
}


function OnMouseUpAsButton () {
ChangeBool11 ();
ChangeBool12 ();
ChangeBool13 ();
}

function ChangeBool11 () {
if (scaryimage1bool == true) {
Debug.Log("redundant");
} else {
scaryimage1bool = true;
return scaryimage1bool;
}
}


function ChangeBool12 () {
if (scaryimage2bool == false) {
Debug.Log("redundant");
} else {
scaryimage2bool = false;
return scaryimage2bool;
}
}


function ChangeBool13 () {
if (scaryimage3bool == false) {
Debug.Log("redundant");
} else {
scaryimage3bool = false;
return scaryimage3bool;
}
}

ScaryImageScript.js

#pragma strict


private var scaryImageChoice : ScaryImageChoice;

var scaryimage1 : GameObject;
var scaryimage2 : GameObject;
var scaryimage3 : GameObject;
var a = Vector3(0,0,0);

function Awake () {
scaryImageChoice = GetComponent(ScaryImageChoice);
}


function Start () {
if (scaryImageChoice.scaryimage1bool == true) {
var this1 : GameObject = Instantiate(scaryimage1, a, transform.rotation);
} else if (scaryImageChoice.scaryimage2bool == true) { 
var this2 : GameObject = Instantiate(scaryimage2, a, transform.rotation);
} else if (scaryImageChoice.scaryimage3bool == true) {
var this3 : GameObject = Instantiate(scaryimage3, a, transform.rotation);
}
}

Thanks Again.

2

I believe you need to make the variables (the one you wish to access from the other script) public.

Example:
public var startingscaryimage1bool : boolean = true;