C# 如何画线下的物体？

我有统一的路线。她的大小是64个点。事实上，重点是什么，但重点是我需要在线条下的区域绘制类似于spriteShape的图案，我很乐意使用它，但我仍然无法理解。这是该行的代码

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

public class soundVisualize : MonoBehaviour {

    public float range = 5000f;

    public int number = 64;
    public float[] oldSpc;

    public LineRenderer line;

    public int spec;

    [Range(0, 1)]
    public float speedAnimation;

    private void Awake() 
    {
        for(int i = 0;i < number; i++)
        {
            Vector3 posInArray = new Vector3(0,0,0);
            if(i>0)
                posInArray = line.GetPosition(i-1);
            line.SetPosition(i,posInArray+new Vector3(0.2f,0,0));
        }    
    }
    
    void Update () {
        float[] spectrum = new float[spec];
        GetComponent<AudioSource>().GetSpectrumData(spectrum, 0, FFTWindow.BlackmanHarris);

        for(int i = 0;i < number; i++)
        {
            line.SetPosition(i,Vector3.Lerp(line.GetPosition(i),new Vector3(line.GetPosition(i).x,(range * spectrum[i] + oldSpc[i])/2),speedAnimation));
            oldSpc[i] = range * spectrum[i];
        }
    }


}

我们有

但我们需要

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我认为用线条渲染器是做不到的。 您应该尝试在运行时创建和修改它。在上边缘有64个三角形，在左下角和右下角有2个三角形

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有关更多信息，请参见官方网站。

这有点棘手，但我将尝试解释我在做什么

基本上，您要做的是创建一个只包含两条线的新网格

您当前的线路位置 底线 所以我要做的就是在一开始创建网格，通过创建这两条线，并将它们与三角形面连接起来

然后，稍后我只需将线渲染器的位置复制到新网格的顶行中

所以看起来有点像

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

public class SoundVisualizer : MonoBehaviour
{
    public LineRenderer line;

    // Best already reference these via the Inspector
    [SerializeField] private AudioSource _audioSource;
    [SerializeField] private MeshFilter _meshFilter;

    public int number = 64;
    public float[] oldSpc;
    public float range = 5000f;

    public int spec;

    [Range(0, 1)] public float speedAnimation;

    // Stores the line positions
    private Vector3[] positions;
    // Stores the mesh reference
    private Mesh _mesh;

    private void Awake()
    {
        // As fallback get it ONCE on runtime
        if (!_audioSource) _audioSource = GetComponent<AudioSource>();
        if (!_meshFilter) _meshFilter = GetComponent<MeshFilter>();

        _mesh = _meshFilter.mesh;

        // Set the point amount via code
        line.positionCount = number;

        // Note that it is way more efficient to use GetPositions and SetPositions
        // instead of using GetPosition and SetPosition multiple times!
        positions = new Vector3[number];
        line.GetPositions(positions);
        
        for (var i = 0; i < number; i++)
        {
            positions[i] = Vector3.right * (0.2f* i);
        }

        line.SetPositions(positions);

        if (spec < number) spec = number;

        oldSpc = new float[spec];

        // Now initialize the mesh once
        // After having set up all the faces etc it is enough to only update
        // The vertex positions
        InitializeMesh();
    }

    private void Update()
    {
        var spectrum = new float[spec];
        _audioSource.GetSpectrumData(spectrum, 0, FFTWindow.BlackmanHarris);

        // Update the values inside of the array you already have
        // -> no need to use GetPositions again
        for (var i = 0; i < number; i++)
        {
            var position = positions[i];

            positions[i] = Vector3.Lerp(position, new Vector3(position.x, (range * spectrum[i] + oldSpc[i]) / 2), speedAnimation);

            oldSpc[i] = range * spectrum[i];
        }

        line.SetPositions(positions);

        UpdateMesh();
    }

    private void InitializeMesh()
    {
        _mesh.Clear();

        // Basically we will create a bottom and a top line each with "number" vertices
        // Then later we create triangulated faces between these two lines
        var vertices = new Vector3[number * 2];

        for (var i = 0; i < number; i++)
        {
            vertices[i] = i * 0.2f * Vector3.right + Vector3.up * 1; // This will be the top line, for debugging set it to y = 1
            vertices[i + number] = i * 0.2f * Vector3.right; // This will be the bottom line
        }

        var triangles = new int[2 * (number - 1) * 3]; // This is "number - 1" * amount f faces per segment (2) * vertices per face ( 3)

        // Now lets create triangulated faces using these vertices and connecting the two lines
        for (var i = 0; i < number - 1; i++)
        {
            triangles[6 * i] = i;
            triangles[6 * i + 1] = i + 1;
            triangles[6 * i + 2] = i + number;

            triangles[6 * i + 3] = i + 1;
            triangles[6 * i + 4] = i + number + 1;
            triangles[6 * i + 5] = i + number;
        }

        _mesh.vertices = vertices;
        _mesh.triangles = triangles;
        _mesh.RecalculateNormals();
    }

    private void UpdateMesh()
    {
        // Basically we will simply update the positions of the top line in the mesh
        // (= the first half of the vertices array)
        // The rest (faces etc) will be updated automatically

        var vertices = _mesh.vertices;
        for (var i = 0; i < number; i++)
        {
            vertices[i] = positions[i];
        }

        _mesh.vertices = vertices;
    }
}

现在看起来是这样的：

请注意，在此当前版本中，您将无法在运行时调整检查器的所有值

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另外请注意，LineRenderer组件当然功能更强，因为它还可以自动生成一些平滑的角点和其他内容

欢迎使用StackOverflow！对不起，我不太明白你到底想达到什么目的，问题到底出在哪里。。你能把你的描述扩大一点吗？也许一些图片有助于更好地理解您的用例。我扩展了这个问题。谢谢！你帮了很多忙

// In this line simply add some negative offset on Y
//
//                                              |
//                                              V
vertices[i + number] = i * 0.2f * Vector3.right - Vector3.up ; // This will be the bottom line