Unity圣典 传送门：http://www.ceeger.com/Script/Camera/Camera.RenderToCubemap.html

Camera.RenderToCubemap 有4个重载

（1）bool  RenderToCubemap(Cubemap cubemap)

　　  bool  RenderToCubemap(Cubemap cubemap,int faceMask)

　　可以用于在编辑器中生成场景静态立方体贴图。faceMask是一个bitfield比特数，表示那个立方贴图面应该被渲染，每个位对

应于一个面。比特数是Cubemapface枚举的整型值。默认的所有六个立方贴图面都被渲染（默认值63的低6位是打开的）。

1 // Render scene from a given point into a static cube map. 2 //从给定的点渲染场景到以静态立方贴图 3 // Place this script in Editor folder of your project. 4 //放置这个脚本到工程的Editor文件夹中 5 // Then use the cubemap with one of Reflective shaders! 6 //然后用一个Reflective shaders 来使用这个立方贴图 7 class RenderCubemapWizard extends ScriptableWizard { 8     var renderFromPosition : Transform; 9     var cubemap : Cubemap;10 11     function OnWizardUpdate () {12         helpString = "Select transform to render from and cubemap to render into";13         isValid = (renderFromPosition != null) && (cubemap != null);14     }15 16     function OnWizardCreate () {17         // create temporary camera for rendering18         //为渲染创建临时相机19         var go = new GameObject( "CubemapCamera", Camera );20         // place it on the object21         //放置它到物体上22         go.transform.position = renderFromPosition.position;23         go.transform.rotation = Quaternion.identity;24 25         // render into cubemap26         //渲染到立方贴图    27         go.camera.RenderToCubemap( cubemap );28 29         // destroy temporary camera30         //销毁临时相机31         DestroyImmediate( go );32     }33 34     @MenuItem("GameObject/Render into Cubemap")35     static function RenderCubemap () {36         ScriptableWizard.DisplayWizard.
     
      (37         "Render cubemap", "Render!");38     }39 }
     

（2）bool  RenderToCubemap(RenderTexture cubemap)

         bool  RenderToCubemap(RenderTexture cubemap,int faceMask)

        这个用于实时反射到立方贴图渲染纹理。这是非常耗时的，尤其是所有六个立方贴图面在每一帧中都被渲染。

如果渲染失败这个函数将返回false，某些显卡不支持这个函数。

　　同时,一定要将 RenderTexture.isCubemap = true

1 using UnityEngine; 2 using System.Collections; 3 using UnityEngine.UI; 4 using UnityEditor; 5  6 // Attach this script to an object that uses a Reflective shader. 7 // Realtime reflective cubemaps! 8 //附加这个脚本到使用了Reflective shader的物体上  9 //实时反射立方贴图10 [ExecuteInEditMode]11 public class RealtimeCubemap :MonoBehaviour12 {13     int cubemapSize = 128;14     //一帧渲染一面15     bool oneFacePerFrame = false; 16     Camera cam = null;17     RenderTexture cubemap = null;18     Material mat = null;19 20     void Start()21     {22         //在启动时渲染所有六个面23         UpdateCubemap(63);24     }25 26     void LateUpdate()27     {28         if (oneFacePerFrame)29         {30             int faceToRender = Time.frameCount % 6;31             int faceMask = 1 << faceToRender;32             UpdateCubemap(faceMask);33         }34         else35         {36             //所有六个面37             UpdateCubemap(63);38         }39     }40 41     42 void UpdateCubemap (int faceMask )43 {44     if (cam == null)45     {46         GameObject go = new GameObject("CubemapCamera", typeof(Camera));47 48         //隐藏在场景中49         go.hideFlags = HideFlags.HideAndDontSave;50         go.transform.position = transform.position;51         go.transform.rotation = Quaternion.identity;52         cam = go.GetComponent
     
      ();53 54         ///不要渲染较远的部分55         cam.farClipPlane = 100;56         cam.enabled = false;57     }58     if (mat == null)59     {60         mat = new Material(Shader.Find("Custom/RealtimeCubemap"));61         mat.hideFlags = HideFlags.HideAndDontSave;62         GetComponent
      
       ().material = mat;63     }64 65     if (cubemap == null)66     {67         cubemap = new RenderTexture(cubemapSize, cubemapSize, 16);68         cubemap.isPowerOfTwo = true;69         cubemap.isCubemap = true;70         cubemap.hideFlags = HideFlags.HideAndDontSave;71         mat.SetTexture("_Cubemap", cubemap);72     }73 74     cam.transform.position = transform.position;75     cam.RenderToCubemap(cubemap, faceMask);76 }77 78     void OnDisable()79     {80         DestroyImmediate(cam);81         DestroyImmediate(cubemap);82     }83 84 }