Lanzador de proyectiles para Unity3D

var projectile : Rigidbody;
var speed = 20;
function Update()
{
 if( Input.GetButtonDown( "Fire1" ) )
 {
  var instantiatedProjectile : Rigidbody = Instantiate(
   projectile, transform.position, transform.rotation );
  instantiatedProjectile.velocity =
   transform.TransformDirection( Vector3( 0, 0, speed ) );
  Physics.IgnoreCollision( instantiatedProjectile. collider,
   transform.root.collider );
 }
}