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;
        }
    }
    
    
}