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:

Code (csharp):

1.     public static Texture2D getScreenshot(int a_Width, int a_Height)
2.     {
3.         List<Camera> cameras = new List<Camera>(Camera.allCameras);
4.     // sort cameras using Depth
5.         cameras.Sort(new CameraComparer());
6.         RenderTexture renderTexture = RenderTexture.GetTemporary(a_Width, a_Height, 24);
7.         RenderTexture.active = renderTexture;  
8.  
9.         foreach (Camera camera in cameras)
10.         {
11.             if (camera.enabled)
12.             {
13.                 float fov = camera.fov;
14.                 camera.targetTexture = renderTexture;
15.                 camera.Render();
16.                 camera.targetTexture = null;
17.                 camera.fov = fov;
18.             }
19.         }
20.  
21.         Texture2D result = new Texture2D(a_Width, a_Height, TextureFormat.ARGB32, false);
22.         result.ReadPixels(new Rect(0.0f, 0.0f, a_Width, a_Height), 0, 0, false);
23.         result.Apply();
24.  
25.         RenderTexture.active = null;
26.  
27.         RenderTexture.ReleaseTemporary(renderTexture);
28.  
29.         return result;
30.     }

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

 

I was having the same problem and I fixed it by creating a new RenderTexture(width, height, 24) instead of using a GetTemporary() one. Just don't forget to Destroy(renderTexture) when you are done with it.