贝塞尔曲线

分享一下今天做的 贝塞尔曲线

三点决定一条曲线, 建立三个小球, 给第一个小球加LineRenderer

LineRenderer要世界空间模式

给第一个小球加脚本,

using UnityEngine;
using System.Collections.Generic;
[RequireComponent(typeof(LineRenderer))]
public class Bezier : MonoBehaviour
{
    public Transform[] controlPoints;
    public LineRenderer lineRenderer;

    private int layerOrder = 0;
    private int _segmentNum = 50;


    void Start()
    {
        if (!lineRenderer)
        {
            lineRenderer = GetComponent<LineRenderer>();
        }
        lineRenderer.sortingLayerID = layerOrder;
    }

    void Update()
    {

        DrawCurve();

    }

    void DrawCurve()
    {
        for (int i = 1; i <= _segmentNum; i++)
        {
            float t = i / (float)_segmentNum;
            int nodeIndex = 0;
            Vector3 pixel = CalculateCubicBezierPoint(t, controlPoints[nodeIndex].position,
                controlPoints[nodeIndex + 1].position, controlPoints[nodeIndex + 2].position);
            lineRenderer.positionCount = i;
            lineRenderer.SetPosition(i - 1, pixel);
        }

    }

    Vector3 CalculateCubicBezierPoint(float t, Vector3 p0, Vector3 p1, Vector3 p2)
    {
        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;
    }

}
public class BezierUtils
{
    /// <summary>
    /// 根据T值，计算贝塞尔曲线上面相对应的点
    /// </summary>
    /// <param name="t"></param>T值
    /// <param name="p0"></param>起始点
    /// <param name="p1"></param>控制点
    /// <param name="p2"></param>目标点
    /// <returns></returns>根据T值计算出来的贝赛尔曲线点
    private static Vector3 CalculateCubicBezierPoint(float t, Vector3 p0, Vector3 p1, Vector3 p2)
    {
        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;
    }

    /// <summary>
    /// 获取存储贝塞尔曲线点的数组
    /// </summary>
    /// <param name="startPoint"></param>起始点
    /// <param name="controlPoint"></param>控制点
    /// <param name="endPoint"></param>目标点
    /// <param name="segmentNum"></param>采样点的数量
    /// <returns></returns>存储贝塞尔曲线点的数组
    public static Vector3[] GetBeizerList(Vector3 startPoint, Vector3 controlPoint, Vector3 endPoint, int segmentNum)
    {
        Vector3[] path = new Vector3[segmentNum];
        for (int i = 1; i <= segmentNum; i++)
        {
            float t = i / (float)segmentNum;
            Vector3 pixel = CalculateCubicBezierPoint(t, startPoint,
                controlPoint, endPoint);
            path[i - 1] = pixel;
            Debug.Log(path[i - 1]);
        }
        return path;

    }
}

controlPoints [ ] 放入三个小球 ,

lineRenderer 放刚加的 lineRenderder,

代码来源 ,感谢分享

https://blog.csdn.net/sinat_25415095/article/details/90112820