Render GUI elements to off screen camera

Question

I have a camera that I've assigned a render texture to, so it doesn't display on the main application window. Using the OnGUI() function doesn't render any GUI elements to this camera, but it does to my other cameras which are displayed on the screen. Is there a way to include this camera in displaying the GUI elements from OnGUI()?

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Answer by Mathieujofis · Apr 30, 2014 at 10:08 PM

Figured out the issue. I just had to set the active RenderTexture to my camera's target texture in OnGUI(), for example:

 void OnGUI()
 {
     RenderTexture.active = myCam.targetTexture;
     GUI.Box(new Rect(200.0f, 100.0f, 600.0f, 300.0f), "Test");
     RenderTexture.active = null;
 }

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at1012 · Jun 07, 2014 at 01:46 PM 0

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I seem to be having a similar problem with my attempts to draw gui to a render texture, I tried to use your solution, but it seems to have no effect. However, when I play my game in "non fullscreen" mode, and try to manually resize the window while the game is playing, I can see my gui elements flicker on the render texture during the re-size, and then disappear again when I stop re-sizing the window. I was wondering what sort of set up you were using in your scene to get this to work?

Any help would be greatly appreciated!

at1012 · Jun 07, 2014 at 03:09 PM 0

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I was able to figure out a solution that seems to work. Since I was drawing my render texture to a surface that would then be drawn by a different camera, I had to set the first camera clearflags to "dont clear" and then manually clear the color buffer on this camera after the second camera had finished rendering the scene image, aka "OnPostRender".

Render GUI elements to off screen camera

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