说明：

年前，在学习Hololens相关知识时，做了一个类似Hololens中微软自行开发的HoloGram程序，大致效果如下：

 

具体的效果链接视频——链接：http://pan.baidu.com/s/1nuAJVSH 密码：4koe

今天主要写一下这个模型包围盒。

包围盒的制作：

建一个立方体的包围盒预制体，之后通过计算模型的包围盒Positon、Scale，来实例化该包围盒的Posion、Scale

如下所示：

包围盒组成部分包含：

1：一个Unity所创建的Cube，如下所示：

通过双面Shader达到如上的效果，双面Shader如何所示：

 

1. Shader "Custom/DoubleShader" {

2. Properties{

3. _Color("Main Color", Color) = (1,1,1,1)//Tint Color

4. _MainTex("Base (RGB)", 2D) = "white" {}

5. _MainTex_2("Base (RGB)", 2D) = "white" {}

6. }

7.  

8. SubShader{

9.  
10.  

11. LOD 100

12. tags{ "Queue" = "Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" }

13. Blend SrcAlpha OneMinusSrcAlpha

14.  

15. Pass{

16. Cull Front

17. Lighting Off

18. SetTexture[_MainTex]{ combine texture }

19. SetTexture[_MainTex]

20. {

21. ConstantColor[_Color]

22. Combine Previous * Constant

23. }

24. }

25.  

26. Pass

27. {

28. Cull Back

29. Lighting Off

30. SetTexture[_MainTex_2]{ combine texture }

31. SetTexture[_MainTex_2]

32. {

33. ConstantColor[_Color]

34. Combine Previous * Constant

35. }

36. }

37. }

38. }

 

2：八个Untiy创建的cube组成的顶点：

3：12个自己创建的球体（自己创建的球体减少了面数）

 

程序计算模型包围盒大小

代码如下所示：

1. using UnityEngine;

2. /// <summary>

3. /// Draw a new MeshBounds

4. /// Made By Bruce.XXQQ

5. /// </summary>

6. public class MeshBounds : MonoBehaviour

7. {

8. public Transform target = null;

9. Renderer[] renderers;

10.  

11. void Start()

12. {

13. if (target == null)

14. target = transform.parent;

15. Reset();

16. }

17. void Reset()

18. {

19. DeleteAllCollider(target);

20. var center = GetAllBoundsCenter(target,out renderers); ;

21. var bounds = addNewCollider(center, renderers);

22.  

23. transform.position = bounds.center;

24. transform.localScale = bounds.size;

25.  

26. //update all chirdren localScale

27. Vector3 pscale = transform.lossyScale;

28. for (int i = 0; i < transform.childCount; i++)

29. {

30. Transform s = transform.GetChild(i);

31. Vector3 sc = s.lossyScale;

32. float max = Mathf.Max(sc.x, sc.y, sc.z);

33. s.localScale = new Vector3(max * 1f / pscale.x, max * 1f / pscale.y, max * 1f / pscale.z);

34. }

35. }

36.  

37. // delete all collider

38. void DeleteAllCollider(Transform transformTarget)

39. {

40. Collider[] colliders = transformTarget.GetComponentsInChildren<Collider>();

41. foreach (Collider child in colliders)

42. {

43. DestroyImmediate(child);

44. }

45. }

46.  

47. //get all Bounds Center

48. Vector3 GetAllBoundsCenter(Transform transformTarget,out Renderer[] renders)

49. {

50. Vector3 center = Vector3.zero;

51. renders = transformTarget.GetComponentsInChildren<Renderer>();

52. foreach (Renderer child in renders)

53. {

54. center += child.bounds.center;

55. }

56. center /= transformTarget.GetComponentsInChildren<Renderer>().Length;

57. return center;

58. }

59.  

60. // add a new bounds and Collider

61. Bounds addNewCollider(Vector3 center,Renderer[]renders)

62. {

63. Bounds bounds = new Bounds(center, Vector3.zero);

64. foreach (Renderer child in renders)

65. {

66. bounds.Encapsulate(child.bounds);

67. }

68. // add a new collider

69. BoxCollider boxCollider = target.gameObject.AddComponent<BoxCollider>();

70. boxCollider.center = bounds.center - target.position;

71. boxCollider.size = bounds.size;

72. return bounds;

73. }

74. }

运行效果如下所示：

 

测试unitypackage链接：

链接：http://pan.baidu.com/s/1nvtzm6P 密码：pnii