unity抛物线的制作

1.先来看效果

2.创建一个空物体,加上LineRenderer组件,再把脚本挂上即可,新建两个cube作为起点和终点,拖到脚本上,运行即可看到效果

代码如下:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SeletParabola : MonoBehaviour
{
    public GameObject startPoint;  //起点
    public GameObject endPoint;    //终点
    public int lineSegmentNum = 50;   
    public float heightFloat = 0.5f;  //抛物线的高度
    private LineRenderer lineRenderer;
    private List<Vector3> listLines = new List<Vector3>();

    void Start()
    {
        lineRenderer = GetComponent<LineRenderer>();
        lineRenderer.positionCount = lineSegmentNum;
        DrawParabola();
    }

    void DrawParabola()
    {
        listLines.Clear();
        Vector3 start = startPoint.transform.position;
        Vector3 end = endPoint.transform.position;
        float step = 1f / lineSegmentNum;

        for (int i = 1; i <= lineSegmentNum; i++)
        {
            float t = step * i;
            Vector3 lineposition = CalculateParabola(start, end, t, heightFloat);
            listLines.Add(lineposition);
            //lineRenderer.SetPosition(i - 1, lineposition);
        }
        lineRenderer.SetPositions(listLines.ToArray());
    }

    public Vector3 CalculateParabola(Vector3 start, Vector3 end, float t, float heigh)
    {
        Vector3 height = Vector3.up * (end - start).magnitude * heigh;
        Vector3 midPoint = (start + end) * 0.5f + height;

        Vector3 P0 = start;
        Vector3 P1 = midPoint;
        Vector3 P2 = end;
        float u = 1 - t;
        float tt = t * t;
        float uu = u * u;
        Vector3 p = uu * P0;
        p += 2 * u * t * P1;
        p += tt * P2;
        return p;
    }
}

3.扩展 (如果想要流动的抛物线,需要一张贴图,然后代码设置材质球的uv)

贴图如下

 贴图设置

 

代码设置参数:

 

 private float aa;
    private void Update()
    {
        aa += Time.deltaTime;
        lineRenderer.material.SetTextureOffset("_MainTex", new Vector2(-aa,0));
    }

 

效果如下

 

本次就这么多了,喜欢的话,关注一下吧,感谢