unity3d 抛物线（炮弹轨迹）

using UnityEngine;
using System.Collections;

public class ProjectileTest : MonoBehaviour
{
public GameObject target;
public float speed = 10;
private float distanceToTarget;
private bool move = true;

void Start ()
{
distanceToTarget = Vector3.Distance (this.transform.position, target.transform.position);
StartCoroutine (Shoot ());
}

IEnumerator Shoot ()
{

while (move) {
Vector3 targetPos = target.transform.position;
this.transform.LookAt (targetPos);
float angle = Mathf.Min (1, Vector3.Distance (this.transform.position, targetPos) / distanceToTarget) * 45;
this.transform.rotation = this.transform.rotation * Quaternion.Euler (Mathf.Clamp (-angle, -42, 42), 0, 0);
float currentDist = Vector3.Distance (this.transform.position, target.transform.position);
print ("currentDist" + currentDist);
if (currentDist < 0.5f)
move = false;
this.transform.Translate (Vector3.forward * Mathf.Min (speed * Time.deltaTime, currentDist));
yield return null;
}
}

}