Rendering screenshot using multiple cameras and one rendertexture

Hi everyone,

I want to be able to take a screenshot with arbitrary dimensions. All enabled cameras must be used. What I have so far is this:

 public static Texture2D getScreenshot(int a_Width, int a_Height)
 {
     List<Camera> cameras = new List<Camera>(Camera.allCameras);
 // sort cameras using Depth
     cameras.Sort(new CameraComparer());
     RenderTexture renderTexture = RenderTexture.GetTemporary(a_Width, a_Height, 24);
     RenderTexture.active = renderTexture;    

     foreach (Camera camera in cameras)
     {
         if (camera.enabled)
         {
             float fov = camera.fov;
             camera.targetTexture = renderTexture;
             camera.Render();
             camera.targetTexture = null;
             camera.fov = fov;
         }
     }

     Texture2D result = new Texture2D(a_Width, a_Height, TextureFormat.ARGB32, false);
     result.ReadPixels(new Rect(0.0f, 0.0f, a_Width, a_Height), 0, 0, false);
     result.Apply();

     RenderTexture.active = null;

     RenderTexture.ReleaseTemporary(renderTexture);

     return result;
 }

The testcase I am using right now has two cameras. One that renders the world, and a second one that renders the sky and clouds (rendered first with a more distant far clipping plane). The result I am getting is the following:

The sky seems to be rendered upside down. But that's not the only thing that's going on ,the sky is a sphere, so it seems odd that the world is also mirrored. Probably from a previous render to the rendertexture ? Also, the sky seems to be too white.

Does anyone have any experience in this area ?

Any help would be appreciated.

Cheers,

Ben