參考鏈接：

http://www.xuanyusong.com/archives/3471

https://www.cnblogs.com/lyh916/p/9162463.html

0.Text的頂點分布

 1 using System.Collections.Generic;
 2 using UnityEngine;
 3 using UnityEngine.UI;
 4 
 5 public class TestMesh : BaseMeshEffect {
 6 
 7     public override void ModifyMesh(VertexHelper vh)
 8     {
 9
 
         List<UIVertex> vertexs = new List<UIVertex>();
10         vh.GetUIVertexStream(vertexs);
11         for (int i = 0; i < vertexs.Count; i++)
12         {
13             Debug.LogWarning(vertexs[i].position);
14         }
15 
16         print(vertexs.Count);
17         print(vh.currentIndexCount);
 
18         print(vh.currentVertCount);
19     }
20 }

新建一個text，然後使內容保留至一個字，添加上面的腳本。可以發現，1個字有4個頂點，而頂點的排列如下圖。1個字由2個三角形組成，繪制順序為0-1-2和2-3-0，順時針繪制。

1.漸變效果

 1 using System.Collections.Generic;
 2 using UnityEngine;
 3 using UnityEngine.UI;
 4 
 5 [AddComponentMenu("UI/Effects/Gradient")]
 6 public class Gradient : BaseMeshEffect
 
 7 {
 8     [SerializeField]
 9     private Color32 topColor = Color.white;
10     [SerializeField]
11     private Color32 bottomColor = Color.black;
12 
13     public override void ModifyMesh(VertexHelper vh)
14     {
15         List<UIVertex> vertexs = new List<UIVertex>();
16         vh.GetUIVertexStream(vertexs);
17         for (int i = 0; i < vertexs.Count;)
18         {
19             SetVertexColor(vertexs, i, topColor);
20             SetVertexColor(vertexs, i + 1, topColor);
21             SetVertexColor(vertexs, i + 2, bottomColor);
22             SetVertexColor(vertexs, i + 3, bottomColor);
23             SetVertexColor(vertexs, i + 4, bottomColor);
24             SetVertexColor(vertexs, i + 5, topColor);
25             i += 6;
26         }
27         vh.Clear();
28         vh.AddUIVertexTriangleStream(vertexs);
29     }
30 
31     private void SetVertexColor(List<UIVertex> vertexs, int index, Color32 color)
32     {
33         UIVertex vertex = vertexs[index];
34         vertex.color = color;
35         vertexs[index] = vertex;
36     }
37 }

2.陰影效果

3.描邊效果

[UGUI]Text文字效果