Hi Chris, The key to managing multiple Camera's that overlay each other is to decide how you want to mange the depth buffer for each of the cameras. For the setup in your description - a Camera to render the background, then a main camera to render the main scene I'd use a PRE_RENDER for the background as you have done but then you need to set up the Camera for the main scene so that it clears the depth buffer. The osghud example illustrates clearing of the depth buffer - but it does this for the slave camera, while you want to do this for the main camera.
Robert.
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