ignore ray collision with game object children

Questions & Answers
1

Hey - I have a script set up to shoot rays into the scene. I want them to ignore the walls of my scene, which I have assigned a tag called Walls. Here’s my script: I’m not sure why it’s not working. I get the error “object reference not set up to an instance of an object”.

var projectile : Rigidbody;
var speed = 20;
var boundaryRef;

function Start(){
	boundaryRef = GameObject.FindGameObjectsWithTag ("Walls");
}

function Update()
{
	if( Input.GetButtonDown( "Fire1" ) ){
		//instantiate a projectile and throw it toward the cube (x axis)
		var instantiatedProjectile : Rigidbody = Instantiate( projectile, transform.position, transform.rotation ) ;
		instantiatedProjectile.velocity = transform.TransformDirection( Vector3( speed, 0, 0) );
		Physics.IgnoreCollision( instantiatedProjectile.collider, boundaryRef.collider); //make sure to ignore collision between launcher and missile
	}
};
2

You don’t want to put your walls in the ‘ignore raycast layer’?

Are you sure you’re getting anything back from FindGameObjectsWithTag?

Did you assign something to projectile in the Inpector or other code?

3

I figured it out. This is probably not the best way to do things, but I realized that boundaryRef creates an array, so I had to change my code to loop through the array and ignore:

for (var i=0; i<boundaryRef.length;i++){
			Physics.IgnoreCollision( instantiatedProjectile.collider, boundaryRef*.collider); //make sure to ignore collision between launcher and missile*

  •  }*