? Unity 『功能總結』?——線段效果（無重力）-有解無憂

3D線段顯示

- 1.創建場景需要的物體
- 2.加入腳本
- 3.最終效果展示
- ==要求做到UI效果2D狀態==

前言：一個萬用表使用功能，要求有電筆和插頭是有連接狀態效果，發現貝塞爾意外的好用

1.創建場景需要的物體

首先創建3個Cube 外加一個LineRenderer

2.加入腳本

加入腳本

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

[ExecuteInEditMode]
public class BezierCurvePointRenderer : MonoBehaviour
{

    public Transform point1;
    public Transform point2;
    public Transform point3;
    public LineRenderer lineRenderer;
      
    [Header("頂點-彎曲度")]
    public int vertexCount;

    public Transform[] positions;

    private List<Vector3> pointList;
    private void Start()
    {
        pointList = new List<Vector3>();
    }
    private void Update()
    {
        //BezierCurveWithThree();

        BezierCurveWithUnlimitPoints();

        lineRenderer.positionCount = pointList.Count;
        lineRenderer.SetPositions(pointList.ToArray());
    }

    private void BezierCurveWithThree()
    {
        pointList.Clear();
        for (float ratio = 0; ratio <= 1; ratio += 1.0f / vertexCount)
        {
            Vector3 tangentLineVertex1 = Vector3.Lerp(point1.position, point2.position, ratio);
            Vector3 tangentLineVertex2 = Vector3.Lerp(point2.position, point3.position, ratio);
            Vector3 bezierPoint = Vector3.Lerp(tangentLineVertex1, tangentLineVertex2, ratio);
            pointList.Add(bezierPoint);
        }
        pointList.Add(point3.position);
    }

    public void BezierCurveWithUnlimitPoints()
    {
        pointList.Clear();
        for (float ratio = 0; ratio <= 1; ratio += 1.0f / vertexCount)
        {
            pointList.Add(UnlimitBezierCurve(positions, ratio));
        }
        pointList.Add(positions[positions.Length - 1].position);
    }
    public Vector3 UnlimitBezierCurve(Transform[] trans, float t)
    {
        Vector3[] temp = new Vector3[trans.Length];
        for (int i = 0; i < temp.Length; i++)
        {
            temp[i] = trans[i].position;
        }
        int n = temp.Length - 1;
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < n - i; j++)
            {
                temp[j] = Vector3.Lerp(temp[j], temp[j + 1], t);
            }
        }
        return temp[0];
    }

    private void OnDrawGizmos()
    {


        #region 無限制頂點數

        Gizmos.color = Color.green;

        for (int i = 0; i < positions.Length - 1; i++)
        {
            Gizmos.DrawLine(positions[i].position, positions[i + 1].position);
        }

        Gizmos.color = Color.red;

        Vector3[] temp = new Vector3[positions.Length];
        for (int i = 0; i < temp.Length; i++)
        {
            temp[i] = positions[i].position;
        }
        int n = temp.Length - 1;
        for (float ratio = 0.5f / vertexCount; ratio < 1; ratio += 1.0f / vertexCount)
        {
            for (int i = 0; i < n - 2; i++)
            {
                Gizmos.DrawLine(Vector3.Lerp(temp[i], temp[i + 1], ratio), Vector3.Lerp(temp[i + 2], temp[i + 3], ratio));
            }

        }
        #endregion
    }
}

3.最終效果展示

要求做到UI效果2D狀態

? Unity 『功能總結』?——2D/UI線段效果貝塞爾（無重力）

大功告成！

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