How to create and use global variables?

Unity Engine
1

I want to create a set of global variables in such a way that every script in my application can read and modify those variables.

Here is a C# script for my global variables;

using UnityEngine;
using System.Collections;

public class [B]GlobalVars[/B] : MonoBehaviour {
	public  static bool  myGlobalBoolVar  = false;
	public  static int   myGlobalIntVar  = 0;
	public  static float myGlobalFloatVar = 1.2f;
	public  static Color myGlobalColorVar = Color.black;
        public  static Transform myGlobalTransformVar;   // [COLOR="#8b0000"][I]How to initialize this variable?[/I][/COLOR] 
        public  static Vector3 myGlobalVector3Var = new Vector3(1.11f,2.22f,3.33f);    		
}
  • :face_with_spiral_eyes:Is this right way defining and initializing global variables?

Here is a C# script to updating the global variables via Inspector;

using UnityEngine;
using System.Collections;

public class [B]GlobalVarTester[/B] : MonoBehaviour {
	[COLOR="#8b0000"][B]// If I use "get" and "set" for a variable, then that variable does not appear in Inspecto[/B]r
	[B]// If I do not use "get" and "set", how can update the global variable in __computationally efficient manner__?[/B][/COLOR]
	public  bool  myBoolVar;[I]//  { get {return GlobalVars.myGlobalBoolVar;}  set {GlobalVars.myGlobalBoolVar = value;}} [/I]
	public  int   myIntVar   { get {return GlobalVars.myGlobalIntVar;}   set {GlobalVars.myGlobalIntVar = value;}}
	public  float myFloatVar { get {return GlobalVars.myGlobalFloatVar;} set {GlobalVars.myGlobalFloatVar = value;}}
	public  Color myColorVar { get {return GlobalVars.myGlobalColorVar;} set {GlobalVars.myGlobalColorVar = value;}}
        public  Transform myTransformVar { get {return GlobalVars.myGlobalTransformVar;}  set {GlobalVars.myGlobalTransformVar = value;}}
        public  Vector3 myVector3Var     { get {return  GlobalVars.myGlobalVector3Var;}   set {GlobalVars.myGlobalVector3Var = value;}}
	
	public double myOtherVar =1234.567;
		
	// Update is called once per frame
	void Update () {
	  [B][COLOR="#8b0000"] // Isn't it inefficient if I do the following assignments repeatedly here in Update function?[/COLOR][/B]
	   GlobalVars.myGlobalBoolVar  = myBoolVar;
	   /*
	    GlobalVars.myGlobalIntVar    = myIntVar;
	    GlobalVars.myGlobalFloatVar  = myFloatVar;
	    GlobalVars.myGlobalColorVar  = myColorVar;
            GlobalVars.myGlobalTransformVar = myTransformVar;
            GlobalVars. myGlobalVector3Var  = myVector3Var;   
	   */
		if (GlobalVars.myGlobalBoolVar) {
		   Debug.Log("myGlobalBoolVar is TRUE");
		} else {
	           Debug.Log("myGlobalBoolVar is FALSE");
		}
	}
}
  • :face_with_spiral_eyes:What is the computationally efficient way to update global variables using Inspector?
  • :face_with_spiral_eyes:Is there a way implementing “OnValueChanged” kind of behavior/mechanism in C#/Unity?

-Adamo

2

Maybe use the class’ Awake method you can transfer the initial values over that you set in your inspector:

public class GlobalVarTester : MonoBehaviour 
{
	public bool myBoolVar = GlobalVars.myGlobalBoolVar;

	private void Awake()
	{
		GlobalVars.myGlobalBoolVar = myBoolVar_Inspector;
	}
}

Just make sure you only have one instance of this GlobalVarTester script.