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Can anyone explain how I can create a mirror effect like the one in this YouTube video using Unity Pro?

I know that I need to use render textures to do it, but I am not sure how.

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I've edited your question, if you cannot walk through it-- then it's not really a portal. –  Noctrine Dec 17 '13 at 17:54
    
I cant quite recall, but I believe you create a camera facing out from your mirror and then use what the camera "sees" as a render texture on the mirror –  Matthew Pigram Dec 18 '13 at 3:10
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Those are done with Render textures . Simply create a new Render Texture to your project and a camera to your scene. Then assign that camera's Target Texture to the Render Texture you created.

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