Accessing variables from objects/scripts

Unity Engine
1

OK, we are entering serious noob territory here so be fore warned. I want to be able to play different “walk” sounds based on the object that the player is colliding with.

I have a script containing variables attached to object 1, and I want to be able to read those variables and use them in object 2 when both objects are colliding.

I have the following in a script for object 1 (the floor object):

var materialType = "wood";

and I have the following in a script in object 2 (the Player):

var walkSound_default: AudioClip;

private var collisionOverlap=false;
private var playsound: AudioClip;
private var collObjectType="default";


function Update () {

   if(collisionOverlap==true){	
      if (GetComponent(ThirdPersonController).moveSpeed>0.3){
      playsound=walkSound_default;
      if (collObjectType=="wood"){		 playsound=collObject.gameObject.GetComponent(Sound_object_collision).walkSound;		
      }
      PlayWalkSound(playsound, transform.position, 1);
}
	collisionOverlap=false;
}


// CHECK FOR COLLISION
function OnCollisionStay(collision : Collision) {
   if (collision.relativeVelocity.magnitude>3){
		collisionOverlap=true;
collObjectType=collision.gameObject.GetComponent(Sound_object_collision).materialType;
	}

}


//PLAY SOUND
function PlayWalkSound (clip : AudioClip, position : Vector3, volume : float)
{
   if (!audio.isPlaying){
      audio.clip = clip;
      audio.volume = volume;
      audio.Play();
   }
}

There are two lines that give me a problem: the “playsound=” declaration in Update, and the “collObjectType=” line under the collision check.

Both of these lines give me NullReferenceExceptions.

This is a piece of code I’ve been staring at for a few days now. I’m giving up my ego and admitting that I just don’t have a clue. Anyone care to offer some advice?

2

We already have dozens of topics on this subject…I think you can find your answer in one of those. Really, there are dozens of topics on this subject. :slight_smile: Plus there’s the page in the docs about accessing other game objects.

–Eric

3

Hmm… well yes I have been searching, but nothing that I’ve found addresses my problem specifically.

I’ve learned how to call an object using Find…

collObjectType = GameObject.Find("Cube").GetComponent(Sound_object_collision).materialType;

the above works fine, however I want to be able to find the variables in the collided game Object, and I won’t know what that object is until collision. Everytime I change the code to reflect this I end up with problems.

function OnCollisionStay(collision : Collision) {
	if (collision.relativeVelocity.magnitude>3){
		collisionOverlap=true;
		collObject=collision.gameObject; 
	}
}


collObjectType = collObject.GetComponent(Sound_object_collision).materialType;

…trying saving the collided object into a gameObject reference and then trying to find info on collObject returns errors.