參考連結：http://blog.csdn.net/zuoyamin/article/details/9287507

對於自定義mesh，有三點很重要：

1.頂點個數=三角形數+2；三角形頂點數=3*三角形數

2.頂點建立的順序最好是順時針或者逆時針建立的，這樣可以大大地減少演算法的複雜度

3.頂點繪製的順序必須是順時針或者逆時針繪製的，這樣才能正確地繪製以頂點為邊界點的圖形，頂點繪製的順序參考mesh.triangles

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(MeshFilter))]
[RequireComponent(typeof(MeshRenderer))]
public class CustomMesh : MonoBehaviour {

}
 

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

//使用前最好先鎖定Inspector面板！
[CustomEditor(typeof(CustomMesh))]  
public class CustomMeshEditor : Editor {

    private List<Vector3> vertices = new List<Vector3>();
    private int[] triangles;

    void OnSceneGUI()
    {
        CustomMesh customMesh = (CustomMesh)target;

        for (int i = 0; i < vertices.Count; i++)
        {
            Handles.PositionHandle(vertices[i], Quaternion.identity);
            Handles.Label(vertices[i], i.ToString());
        }
        if (vertices.Count > 1)
        {
            Handles.DrawPolyLine(vertices.ToArray());
            Handles.DrawLine(vertices[vertices.Count - 1], vertices[0]);
        }     

        //在OnSceneGUI()中只能通過Handles來繪製新檢視
        //如果你想引入GUI的元素哪麼就需要使用BeginGUI()和EndGUI()組合的使用。  
        Handles.BeginGUI();
        GUILayout.BeginArea(new Rect(0, 0, 100, 100));
 
        if (GUILayout.Button("建立點"))
        {
            vertices.Add(customMesh.transform.position);          
        }
        if (GUILayout.Button("撤銷點"))
        {
            vertices.RemoveAt(vertices.Count - 1);
        }
        if (GUILayout.Button("匯出mesh"))
        {
            Mesh mesh = new Mesh();
            
            int triangleAmount = vertices.Count - 2;
            triangles = new int[3 * triangleAmount];

            //根據三角形的個數，來計算繪製三角形的頂點順序（索引）
            //順序必須為順時針或者逆時針
            for (int i = 0; i < triangleAmount; i++)
            {
                triangles[3 * i] = 0;//固定第一個點
                triangles[3 * i + 1] = i + 1;
                triangles[3 * i + 2] = i + 2;
            }

            mesh.vertices = vertices.ToArray();
            mesh.triangles = triangles;

            AssetDatabase.CreateAsset(mesh, "Assets/CustomMesh.asset");
        }
        GUILayout.EndArea();
        Handles.EndGUI();   
    }
}
 

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

例項(屬性圖的製作)：

using UnityEngine;
using System.Collections.Generic;

[RequireComponent(typeof(MeshFilter))]
[RequireComponent(typeof(MeshRenderer))]  
public class CreatePentagon : MonoBehaviour {

    public Transform[] verticesTra;//賦值順序為順時針或者逆時針
    public float[] proportion;//比例

    void Start()
    {
        List<Vector3> vertices = new List<Vector3>();
        for (int i = 0; i < verticesTra.Length; i++)
        {
            Vector3 pos = (verticesTra[i].position - transform.position) * proportion[i];
            vertices.Add(pos);
        }

        DrawPentagon(vertices);
    }

    void DrawPentagon(List<Vector3> vertices)
    {
        Mesh mesh = new Mesh();
        int triangleAmount = vertices.Count - 2;
        int[] triangles = new int[3 * triangleAmount];

        //根據三角形的個數，來計算繪製三角形的頂點順序（索引）  
        //順序必須為順時針或者逆時針  
        for (int i = 0; i < triangleAmount; i++)
        {
            triangles[3 * i] = 0;//固定第一個點  
            triangles[3 * i + 1] = i + 1;
            triangles[3 * i + 2] = i + 2;
        }

        mesh.vertices = vertices.ToArray();
        mesh.triangles = triangles;

        GetComponent<MeshFilter>().mesh = mesh;
    }
}