unity在编辑器中静态生成cubemap的六张纹理

脚本名必须为：SkyBoxGenerator.js，否则报错

使用方法：脚本必须放置在项目文件中名为“Editor”的文件夹；该脚本写好保存之后，unity编辑的菜单上会出现一个名为“Custom/Render Skybox”菜单。当选定会弹出一个对话框，设置一个渲染位置然后点击“Render”，并等待几秒钟，刷新项目窗口，生成的6张图片将出现在名为“Skyboxes”的文件夹。警告，每次运行这个脚本，它会覆盖以前生成的图像。

脚本内容：
class SkyBoxGenerator extends ScriptableWizard
{
var renderFromPosition : Transform;

var skyBoxImage = new Array ("frontImage", "rightImage", "backImage", "leftImage", "upImage", "downImage");

var skyDirection = new Array (Vector3 (0,0,0), Vector3 (0,-90,0), Vector3 (0,180,0), Vector3 (0,90,0), Vector3 (-90,0,0), Vector3 (90,0,0));


function OnWizardUpdate()
{
helpString = "Select transform to render from";
isValid = (renderFromPosition != null);
}

function OnWizardCreate()
{
var go = new GameObject ("SkyboxCamera", Camera);

go.camera.backgroundColor = Color.black;
go.camera.clearFlags = CameraClearFlags.Skybox;
go.camera.fieldOfView = 90;
go.camera.aspect = 1.0;

go.transform.position = renderFromPosition.position;

if (renderFromPosition.renderer)
{
go.transform.position = renderFromPosition.renderer.bounds.center;
}

go.transform.rotation = Quaternion.identity;

for (var orientation = 0; orientation < skyDirection.length ; orientation++)
{
renderSkyImage(orientation, go);
}

DestroyImmediate (go);
}

@MenuItem("Custom/Render Skybox", false, 4)
static function RenderSkyBox()
{
ScriptableWizard.DisplayWizard ("Render SkyBox", SkyBoxGenerator, "Render!");
}

function renderSkyImage(orientation : int, go : GameObject)
{
go.transform.eulerAngles = skyDirection[orientation];
var screenSize = 1024;
var rt = new RenderTexture (screenSize, screenSize, 24);
go.camera.targetTexture = rt;
var screenShot = new Texture2D (screenSize, screenSize, TextureFormat.RGB24, false);
go.camera.Render();
RenderTexture.active = rt;
screenShot.ReadPixels (Rect (0, 0, screenSize, screenSize), 0, 0);

RenderTexture.active = null;
DestroyImmediate (rt);
var bytes = screenShot.EncodeToPNG();

var directory = "Assets/Skyboxes";
if (!System.IO.Directory.Exists(directory))
System.IO.Directory.CreateDirectory(directory);
System.IO.File.WriteAllBytes (System.IO.Path.Combine(directory, skyBoxImage[orientation] + ".png"), bytes);
}

}