30行代码，在Unity制造一个风中飘舞的旗帜
0.效果1.代码
using UnityEngine;
using DG.Tweening; //DoTween补间库，可以到AssetStore下载
public class ProceduralMesh : MonoBehaviour
{
private int xValue, yValue;
private MeshFilter meshFilter;
private Mesh mesh;
private Vector3[] vertices;
private Vector3[,] vertices2dArray;
private Vector3[,] vertices2dArray_Origin;
private float rate = -1f;
private void Start()
{
meshFilter = GetComponent<MeshFilter>();
DOTween.To(() => rate, x => rate = x, 6, 2).SetLoops(-1, LoopType.Yoyo).SetEase(Ease.InOutSine);
GenerateMesh();
}
private void Update()
{
//动画
for (int x = 0; x <= xValue; x++)
{
for (int y = yValue; y > -1; y--)
{
Vector3 pos = vertices2dArray_Origin
+ new Vector3(Mathf.Cos((270 + (yValue - y) * rate) * Mathf.Deg2Rad), 0);
vertices2dArray = pos;
}
}
for (int index = 0, y = 0; y <= yValue; y++)
{
for (int x = 0; x <= xValue; x++, index++)
{
vertices = vertices2dArray;
}
}
mesh.vertices = vertices;
}
private void GenerateMesh()
{
//顶点 + UV
vertices = new Vector3[(xValue + 1) * (yValue + 1)];
vertices2dArray = new Vector3;
vertices2dArray_Origin = new Vector3;
Vector2[] uv = new Vector2;
for (int i = 0, y = 0; y <= yValue; y++)
{
for (int x = 0; x <= xValue; x++, i++)
{
vertices = new Vector2(x, y);
vertices2dArray = new Vector2(x, y);
vertices2dArray_Origin = new Vector2(x, y);
uv = new Vector2((float)x / xValue, (float)y / yValue);
}
}
//三角形(ti：TriangleIndex，vi：VerticesIndex)
int[] triangles = new int;
for (int ti = 0, vi = 0, y = 0; y < yValue; y++, vi++)
{
for (int x = 0; x < xValue; x++, ti += 6, vi++)
{
triangles = vi;
triangles = triangles = vi + 1;
triangles = triangles = vi + xValue + 1;
triangles = vi + xValue + 2;
}
}
mesh = new Mesh() { vertices = vertices, triangles = triangles, uv = uv, name = &#34;Flag&#34; };
meshFilter.mesh = mesh;
}
}
2.简析
[*]首先生成一个正确的网格。
[*]每帧从旗帜的上方到下方依次改变顶点位置。
[*]创建一个pingpong型的补间数值，用这个数值驱动顶点位移，形成动画。
[*]注：另外需要注意的是，这种效果在正常情况下或许会选择在GPU实现来达到一个最佳性能，但是这篇短文是一个关于Mesh变形的简短示例，所以就用了一个这样的例子，请大家辩证看待。一来为初次接触Mesh编程的同学带来一个最最直观的示例，知道了Mesh编程究竟能做什么。二来为之后真正的Mesh变形+物理碰撞系列文章做一个基础铺垫。
3.源文件地址
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