这是一个完整的脚本，箭在对象手里（子级）。。还有射击精度控制。。。你可以只看你需要的功能即可。。。
为了这个功能，花费了不少时间。。还意外发现，游戏中的模型的大小比例会影响物理效果，得到的结果和用笔实际计算的不一样！！（不知道对不对，还请知道的大神麻烦留言解释下，谢谢了）。。。。所以：
注意：
发射角度（这里是45），如果你达不到效果（射中目标），请自己更改。还有标注为*****那行的*2。。。是
一个特殊值（我也没弄明白，还请大神赐教）。。。也请自己更改。。。。。
/华丽的分割线
using UnityEngine;
using System.Collections; //斜抛运动轨迹控制脚本 public class ThrowMoveTrailControl : MonoBehaviour { private Transform shoot_enemy=null; //获取目标位置 private float R=0; //射击精度控制, private float distance_h=0; private float real_distance_h = 0; private Vector3 pos; private Vector3 world_pos_self; private Vector3 world_pos_enemy; private Vector3 real_shoot_pos; private float shoot_radian; //射击弧度 private float shoot_speed; //发射速度 private float delta_time=0; //从开始发射到现在消耗的时间 private float cos_radian; private float sin_radian; private float angle_x; //发射方向离世界x轴的夹角 private float angle_z; //发射方向离世界z轴的夹角 private Vector3 start_world_pos; //箭发射那一刻的世界坐标 ///抛物线坐标点在各个坐标轴的投影 private float move_x=0; private float move_y=0; private float move_z=0;const float G = 9.8f; //重力加速度
//先初始化这个箭
// be call before function:start() private void Awake() { KulouArcherActions k=null; k=transform.GetComponentInParent<KulouArcherActions>(); if(k==null) Debug.Log("the arrow have not shoot enemy??????????"); shoot_enemy=k.close_enemy.transform; //get the shoot position pos = new Vector3(); real_shoot_pos = new Vector3(); transform.parent = null; //把箭移出所有父级 shoot_radian = 45* Mathf.PI / 180; cos_radian = Mathf.Cos(shoot_radian); sin_radian = Mathf.Sin(shoot_radian); ready(); } void ready() { world_pos_self = transform.TransformPoint(Vector3.zero); world_pos_enemy = shoot_enemy.TransformPoint(Vector3.zero); pos.Set(world_pos_self.x, world_pos_enemy.y, world_pos_self.z); distance_h = Vector3.Distance(pos, world_pos_enemy); //世界坐标的水平距离 /计算在有射击精度误差的情况下 R = (distance_h - 1f) * 0f; //1 as attack distance real_shoot_pos.Set((world_pos_enemy.x + Random.Range(-R, R)), world_pos_self.y, (world_pos_enemy.z + Random.Range(-R, R))); //以目标为中心，R为半径的一个圆作为误差范围 real_distance_h = Vector3.Distance(world_pos_self,real_shoot_pos); shoot_speed = Mathf.Sqrt(real_distance_h * G /2*sin_radian*cos_radian) *2; //********************* angle_x = Vector3.Angle(real_shoot_pos - world_pos_self, Vector3.right); //获取和世界x轴夹角 angle_z = Vector3.Angle(real_shoot_pos - world_pos_self, Vector3.forward); //获取和世界z轴夹角 start_world_pos =world_pos_self;}
///开始按帧移动
// Update is called once per frame void Update () { distance_h = shoot_speed * cos_radian*delta_time; //由消耗时间计算总的水平移动距离 move_z = distance_h * Mathf.Cos(angle_z * Mathf.PI / 180); //算出这个向着目标移动的水平距离投影到各个坐标的实际移动值 move_x = distance_h * Mathf.Cos(angle_x * Mathf.PI / 180); move_y = (shoot_speed * delta_time * sin_radian - G * delta_time * delta_time * 0.5f); pos.Set(start_world_pos.x + move_x, start_world_pos.y+move_y, start_world_pos.z +move_z);//由初始的坐标加上本帧需要移动的，由此来连续移动 transform.rotation = Quaternion.FromToRotation(Vector3.left, pos - transform.position);//旋转箭头，指向下一个移动的坐标点 transform.position=pos; delta_time += Time.deltaTime; //累计消耗时间 } }