ClusterMissile

using UnityEngine;
using System.Collections;

public class ClusterMissileProjectile : MonoBehaviour {

    public float ExplodeDistance = 3;
    public float MissileSpeed = 5;
    public float ClusterAmount = 3;
    public float ClusterSpreadDegrees = 120;

    public int ChildrenToSpawn = 3;

    private Vector3 _startPosition;

    // Use this for initialization
    void Start () {
        _startPosition = transform.position;
    }

    // Update is called once per frame
    void Update () {
        if(Vector3.Distance(_startPosition, transform.position) >= ExplodeDistance){
            Explode();
        } else {
            transform.Translate(Vector3.up * MissileSpeed * Time.deltaTime);
        }
    }

    /// <summary>
    /// Explode this instance.
    /// </summary>
    void Explode(){

        //this value will go down each time a new set of children is spawned
        if(ChildrenToSpawn > 0){
            var spreadMax = ClusterSpreadDegrees / 2;
            var spreadDistance = ClusterSpreadDegrees / (ClusterAmount-1);

            //initial rotation (in this case -22.5)
            var rotationAmountDegrees = -spreadMax;
            for (int i = 0; i < ClusterAmount; i++) {

                var newMissile = Instantiate(this.gameObject, transform.position, transform.rotation) as GameObject;

                //Vector3.right is towards the camera
                newMissile.transform.RotateAround(transform.position, Vector3.right, rotationAmountDegrees);
                rotationAmountDegrees += spreadDistance;

                //make sure we don't create these infinitely
                newMissile.GetComponent<ClusterMissileProjectile>().ChildrenToSpawn -= 1;
            }

        }

        Destroy(gameObject);

    }
}