直接上代码

代码

  public class ThrownItem : MonoBehaviour
    { 
        public Vector3 Velocity;
        public LayerMask layer;
        public Vector3 Gravity = Physics.gravity;
        public bool active;

        private Vector3 current_pos;//当前位置
        private Vector3 start;
        private float i = 1f;

        //额外视觉效果 使模型可以旋转
        public float rotateSpeed = 600f; 
        public Transform model;
        Vector3 defaultRotate;
        void Start()
        {
            start = transform.position;
            current_pos = start;
            if (model) defaultRotate = model.eulerAngles;
        } 


        private void Update()
        {
            if (active)
            { 
                model.Rotate(Vector3.right * rotateSpeed * Time.deltaTime, Space.Self);//在空中旋转
            }
        }
        private void FixedUpdate()
        {
            CalculateThrownMove(Time.fixedDeltaTime);
        }

        /// <summary>
        /// 核心计算 
        /// </summary>
        void CalculateThrownMove(float tick)
        {
            if (active)
            {
                float time = tick * i;
                var gravity = Gravity * time * time / 2;//计算重力
                var nex = Velocity * time;//下一个位置
                Vector3 next_pos = start + nex + gravity; //下一个位置
                Debug.DrawLine(current_pos, next_pos, Color.yellow);
                transform.position = current_pos; 
                if (Physics.Linecast(current_pos, next_pos, out RaycastHit hit, layer, QueryTriggerInteraction.Ignore))
                {
                    model.eulerAngles = defaultRotate + new Vector3(Random.Range(1, 46), 0, 0); //更改旋转角度
                      
                    active = false; 
                    Debug.Log(hit.transform.name);//击中了 做一些判断
                    Destroy(gameObject, 5);
                }
                current_pos = next_pos;
                i++; //很重要  
            }
        } 
    }

测试脚本

public class ThrownPoint : MonoBehaviour
    {
        public ThrownItem item;

        public Transform point;
        public float powerMulti;
       public Vector3 velocity;//46
        float time;
        public bool debug;
        void Update()
        {
            //if (UnityEngine.Input.GetKey(KeyCode.Mouse0))
            //{
            //    time += Time.deltaTime;
            //    velocity = transform.forward * powerMulti * time;
            //}


            if (UnityEngine.Input.GetKeyUp(KeyCode.Mouse0))
            {
                velocity = transform.forward * powerMulti;
                 var clone = Instantiate(item,transform.position,transform.rotation);
                clone.Velocity = velocity;
                clone.active = true;
                velocity = Vector3.zero;
                time = 0;
                if (debug)
                {
                    Debug.Break();
                    debug = false;
                }
            }

        }
    }