Unity3D: Make a particle explosion when bullets hit - Source: http://wiki.dreamsteep.com/Unity_tools

ParticleExplosion.js

var explody_pf :Transform;


function explody (){

   var instancedbullet =Instantiate( explody_pf ,transform.position,Quaternion.identity);
   //instancedbullet.rigidbody.AddForce(transform.forward * shootForce);

}

			 
function OnCollisionEnter (collisionInfo : Collision) {
   
  // print (collisionInfo.gameObject.tag) ; //??? HTH DO I TAG?
  // if (collisionInfo.gameObject.tag=="sphere"){
  //
  // print (collisionInfo.gameObject.transform.position) ;

  explody();

     var rand: int = Random.Range(-200,200);
    collisionInfo.gameObject.rigidbody.AddForce(Vector3.up*1500);
    collisionInfo.gameObject.rigidbody.AddForce(Vector3.right*rand);   
	
   //}
   

}


function OnCollisionEnter (collisionInfo : Collision) {

   if (collisionInfo.gameObject.tag=="sphere"){
     var rand: int = Random.Range(-200,200);
     collisionInfo.gameObject.rigidbody.AddForce(Vector3.up*500);
     collisionInfo.gameObject.rigidbody.AddForce(Vector3.right*rand);   
   }

}