【Unity 3D】元宇宙案例之虚拟地球信息射线实战（附源码、演示视频和步骤 超详细）

using System.Collections;
using Uni
public class Earth : MonoBehaviour
{
    public Line line;// 曲线
    private Vector3 pos1 = Vector3.zero;// 鼠标点击第一个点
    private Vector3 pos2 = V
    {
        line.gameObject.SetActive(false);
    }
    void Update()
    {
        // 地球自转
        transform.Rotate(Vector3.up * Time.deltaTime, Space.Self);
        // 点击发射虚拟地球信息射线
        RayClickLine();
        // 自动发射虚拟地球信息射线
        AutoFireLine();
    }
    /// <summar
    private void RayClickLine()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                mouseClicks++;
                if (mouseClicks == 1)
                {
                    // 第一个点坐标
                    pos1 = hit.point;
                }
                if (mouseClicks == 2)
                {2 = hit.point;
                    // 计算其他点的坐标
                    Vector3[] pos;
                    pos = CountPoints(pos1, pos2);
                    Vector3 ctrlPoint1 = pos[0];
                    Vector3 ctrlPoint2 = pos[1];
                    Line line = Instantiate(this.line);
                    line.gameObject.SetActive(true);
                    line.transform.SetParent(transform);
                    // 画线
                    StartCoroutine(line.DrawRay(transform.position,pos1, ctrlPoint1, ctrlPoint2, pos2));
                    // 状态恢复
                    pos1 = Vector3.zero;
                    pos2 = Vector3.zero;
                    mouseClicks = 0;
                }
            }
        }
    }
    /// <summary>
    /// 自动发射虚拟地球信息射线
    /// </summary>
    /// <returns></returns>
    void AutoFireLine()
    {
        //this.line.gameObject.SetActive(false);
        invokeTime += Time.deltaTime;
        if (invokeTime > invokeDistance)
        {
            // 循环生成曲线
            Line line = Instantiate(this.line);
            line.gameObject.SetActive(true);
            line.transform.SetParent(transform);
            // 在地球表面随机一个起始点
            Vector3 fromPos = SpawnRandPos();
            // 在地球表面随机一个终点
            Vector3 toPos = SpawnRandPos();
            // 计算其他点的坐标
            Vector3[] pos;
            pos = CountPoints(fromPos, toPos);
            Vector3 ctrlPoint1 = pos[0];
            Vector3 ctrlPoint2 = pos[1];
            StartCoroutine(line.DrawRay(transform.position,fromPos, ctrlPoint1, ctrlPoint2, toPos));
            // 状态恢复
            invokeTime = 0;
            invokeDistance = Random.Range(0.3f, 2f);
        }
    }
        // 控制点2
        pos[1] = toPos + (center - transform.position).normalized * (fromPos - toPos).magnitude * 0.6f;
        return pos;
    }
    //生成随机点
    private Vector3 SpawnRandPos()
    {
        // 半径
        float radius = transform.localScale.x / 2f;
        Vector3 Pos= transform.position + new Vector3(Random.Range(-1f, 1f), Random.Range(-1f, 1f), Random.Range(-1f, 1f)).normalized * radius;
        return Pos;
    }
}

using System.Collections;
using SystEngine;
public class Line : MonoBehaviour
{
    private LineRenderer lineRenderer;//lineRenderer组件
    private List<Vector3> posList = new List<Vector3>();//存储点坐标
    public int MAX_FRAG_CNT = 100;//曲线最大点数
    void Awake()
    {
        lineRenderer = GetComponent<LineRenderer>();
    }
    public Transform startPoint;//开始位置波纹粒子
    public Transform endPoint;  //结束位置波纹粒子
    /// <summary>
    /// 绘制曲线
    /// </summary>
    /// <param name="earthPos">虚拟地球位置</param>
    /// <param name="fromPos">起点坐标</param>
    /// <param name=trlPoint2">控制坐标2</param>
    /// <param name="toPos">终点坐标</param>
    /// <returns></returns>
    public IEnumerator DrawRay(Vector3 earthPos, Vector3 fromPos, Vector3 ctrlPoint1, Vector3 ctrlPoint2, Vector3 toPos)
    {
        // 起始位置粒子
        startPoint.gameObject.SetActive(true);
        startPoint.forward = fromPos - earthPos;
        startPoint.localPosition = fromPos + startPoint.forward * 0.01f;
        for (int i = 0; i <= MAX_FRAG_CNT; ++i)
        {
            posList.Clear();
            for (int j = 0; j <= i; ++j)
            {
                posList.Add(cubicBezier(fromPos, ctrlPoint1, ctrlPoint2, toPos, (float)j / MAX_FRAG_CNT));
            }
            lineRenderer.positionCount = posList.Count;
            lineRenderer.SetPositions(posList.ToArray());
            yield return new WaitForSeconds(0.02f);
        }
        // 目标位置粒子
        endPoint.gameObject.SetActive(true);
        endPoint.forward =MAX_FRAG_CNT; ++i)
        {
            posList.Clear();
            for (int j = i; j <= MAX_FRAG_CNT; ++j)
            {
                posList.Add(cubicBezier(fromPos, ctrlPoint1, ctrlPoint2, toPos, (float)j / MAX_FRAG_CNT));
            }
            lineRenderer.positionCount = posList.Count;
            lineRenderer.SetPositions(posList.ToArray());
            yield return new WaitForSeconds(0.001f);
        }
        Destroy(gameObject);
    }
    /// <summary>
    /// 三阶贝塞尔曲线
    /// </summary>
    /// <param name="pos1">控制点1</param>
    /// <param name=
    private Vector3 cubicBezier(Vector3 pos1, Vector3 pos2, Vector3 pos3, Vector3 pos4, float t)
    {
        Vector3 aa = pos1 + (pos2 - pos1) * t;
        Vector3 bb = pos2 + (pos3 - pos2) * t;
        Vector3 cc = pos3 + (pos4 - pos3) * t;
        return (aa + (bb - aa) * t) + ((bb + (cc - bb) * t) - (aa + (bb - aa) * t)) * t;
    }
}