参考
对于自定义mesh，有三点很重要：
1.顶点个数=三角形数+2；三角形顶点数=3*三角形数
2.顶点创建的顺序最好是顺时针或者逆时针创建的，这样可以大大地减少算法的复杂度
3.顶点绘制的顺序必须是顺时针或者逆时针绘制的，这样才能正确地绘制以顶点为边界点的图形，顶点绘制的顺序参考mesh.triangles
[csharp] view plain copy
1. using UnityEngine;
2. using System.Collections;
3.
4. [RequireComponent(typeof(MeshFilter))]
5. [RequireComponent(typeof(MeshRenderer))]
6. public class CustomMesh : MonoBehaviour {
7.
8. }
[csharp] view plain copy
1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEditor;
5.
6. //使用前最好先锁定Inspector面板！
7. [CustomEditor(typeof(CustomMesh))]
8. public class CustomMeshEditor : Editor {
9.
10. private List<Vector3> vertices = new List<Vector3>();
11. private int[] triangles;
12.
13. void OnSceneGUI()
14. {
15. CustomMesh customMesh = (CustomMesh)target;
16.
17. for (int i = 0; i < vertices.Count; i++)
18. {
19. Handles.PositionHandle(vertices[i], Quaternion.identity);
20. Handles.Label(vertices[i], i.ToString());
21. }
22. if (vertices.Count > 1)
23. {
24. Handles.DrawPolyLine(vertices.ToArray());
25. Handles.DrawLine(vertices[vertices.Count - 1], vertices[0]);
26. }
27.
28. //在OnSceneGUI()中只能通过Handles来绘制新视图
29. //如果你想引入GUI的元素哪么就需要使用BeginGUI()和EndGUI()组合的使用。
30. Handles.BeginGUI();
31. new Rect(0, 0, 100, 100));
32.
33. if (GUILayout.Button("创建点"))
34. {
35. vertices.Add(customMesh.transform.position);
36. }
37. if (GUILayout.Button("撤销点"))
38. {
39. vertices.RemoveAt(vertices.Count - 1);
40. }
41. if (GUILayout.Button("导出mesh"))
42. {
43. new Mesh();
44.
45. int triangleAmount = vertices.Count - 2;
46. new int[3 * triangleAmount];
47.
48. //根据三角形的个数，来计算绘制三角形的顶点顺序（索引）
49. //顺序必须为顺时针或者逆时针
50. for (int i = 0; i < triangleAmount; i++)
51. {
52. //固定第一个点
53. triangles[3 * i + 1] = i + 1;
54. triangles[3 * i + 2] = i + 2;
55. }
56.
57. mesh.vertices = vertices.ToArray();
58. mesh.triangles = triangles;
59.
60. "Assets/CustomMesh.asset");
61. }
62. GUILayout.EndArea();
63. Handles.EndGUI();
64. }
65. }
///
实例(属性图的制作)：
[csharp] view plain copy
1. using UnityEngine;
2. using System.Collections.Generic;
3.
4. [RequireComponent(typeof(MeshFilter))]
5. [RequireComponent(typeof(MeshRenderer))]
6. public class CreatePentagon : MonoBehaviour {
7.
8. public Transform[] verticesTra;//赋值顺序为顺时针或者逆时针
9. public float[] proportion;//比例
10.
11. void Start()
12. {
13. new List<Vector3>();
14. for (int i = 0; i < verticesTra.Length; i++)
15. {
16. Vector3 pos = (verticesTra[i].position - transform.position) * proportion[i];
17. vertices.Add(pos);
18. }
19.
20. DrawPentagon(vertices);
21. }
22.
23. void DrawPentagon(List<Vector3> vertices)
24. {
25. new Mesh();
26. int triangleAmount = vertices.Count - 2;
27. int[] triangles = new int[3 * triangleAmount];
28.
29. //根据三角形的个数，来计算绘制三角形的顶点顺序（索引）
30. //顺序必须为顺时针或者逆时针
31. for (int i = 0; i < triangleAmount; i++)
32. {
33. //固定第一个点
34. triangles[3 * i + 1] = i + 1;
35. triangles[3 * i + 2] = i + 2;
36. }
37.
38. mesh.vertices = vertices.ToArray();
39. mesh.triangles = triangles;
40.
41. GetComponent<MeshFilter>().mesh = mesh;
42. }
43. }
参考链接：
对于自定义mesh，有三点很重要：
1.顶点个数=三角形数+2；三角形顶点数=3*三角形数
2.顶点创建的顺序最好是顺时针或者逆时针创建的，这样可以大大地减少算法的复杂度
3.顶点绘制的顺序必须是顺时针或者逆时针绘制的，这样才能正确地绘制以顶点为边界点的图形，顶点绘制的顺序参考mesh.triangles
[csharp] view plain copy
1. using UnityEngine;
2. using System.Collections;
3.
4. [RequireComponent(typeof(MeshFilter))]
5. [RequireComponent(typeof(MeshRenderer))]
6. public class CustomMesh : MonoBehaviour {
7.
8. }
[csharp] view plain copy
1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEditor;
5.
6. //使用前最好先锁定Inspector面板！
7. [CustomEditor(typeof(CustomMesh))]
8. public class CustomMeshEditor : Editor {
9.
10. private List<Vector3> vertices = new List<Vector3>();
11. private int[] triangles;
12.
13. void OnSceneGUI()
14. {
15. CustomMesh customMesh = (CustomMesh)target;
16.
17. for (int i = 0; i < vertices.Count; i++)
18. {
19. Handles.PositionHandle(vertices[i], Quaternion.identity);
20. Handles.Label(vertices[i], i.ToString());
21. }
22. if (vertices.Count > 1)
23. {
24. Handles.DrawPolyLine(vertices.ToArray());
25. Handles.DrawLine(vertices[vertices.Count - 1], vertices[0]);
26. }
27.
28. //在OnSceneGUI()中只能通过Handles来绘制新视图
29. //如果你想引入GUI的元素哪么就需要使用BeginGUI()和EndGUI()组合的使用。
30. Handles.BeginGUI();
31. new Rect(0, 0, 100, 100));
32.
33. if (GUILayout.Button("创建点"))
34. {
35. vertices.Add(customMesh.transform.position);
36. }
37. if (GUILayout.Button("撤销点"))
38. {
39. vertices.RemoveAt(vertices.Count - 1);
40. }
41. if (GUILayout.Button("导出mesh"))
42. {
43. new Mesh();
44.
45. int triangleAmount = vertices.Count - 2;
46. new int[3 * triangleAmount];
47.
48. //根据三角形的个数，来计算绘制三角形的顶点顺序（索引）
49. //顺序必须为顺时针或者逆时针
50. for (int i = 0; i < triangleAmount; i++)
51. {
52. //固定第一个点
53. triangles[3 * i + 1] = i + 1;
54. triangles[3 * i + 2] = i + 2;
55. }
56.
57. mesh.vertices = vertices.ToArray();
58. mesh.triangles = triangles;
59.
60. "Assets/CustomMesh.asset");
61. }
62. GUILayout.EndArea();
63. Handles.EndGUI();
64. }
65. }
///
实例(属性图的制作)：
[csharp] view plain copy
1. using UnityEngine;
2. using System.Collections.Generic;
3.
4. [RequireComponent(typeof(MeshFilter))]
5. [RequireComponent(typeof(MeshRenderer))]
6. public class CreatePentagon : MonoBehaviour {
7.
8. public Transform[] verticesTra;//赋值顺序为顺时针或者逆时针
9. public float[] proportion;//比例
10.
11. void Start()
12. {
13. new List<Vector3>();
14. for (int i = 0; i < verticesTra.Length; i++)
15. {
16. Vector3 pos = (verticesTra[i].position - transform.position) * proportion[i];
17. vertices.Add(pos);
18. }
19.
20. DrawPentagon(vertices);
21. }
22.
23. void DrawPentagon(List<Vector3> vertices)
24. {
25. new Mesh();
26. int triangleAmount = vertices.Count - 2;
27. int[] triangles = new int[3 * triangleAmount];
28.
29. //根据三角形的个数，来计算绘制三角形的顶点顺序（索引）
30. //顺序必须为顺时针或者逆时针
31. for (int i = 0; i < triangleAmount; i++)
32. {
33. //固定第一个点
34. triangles[3 * i + 1] = i + 1;
35. triangles[3 * i + 2] = i + 2;
36. }
37.
38. mesh.vertices = vertices.ToArray();
39. mesh.triangles = triangles;
40.
41. GetComponent<MeshFilter>().mesh = mesh;
42. }
43. }
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