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generating cubemaps in realtime is not so slow if you do it right.. that's how my Sphere Engine shadows work.

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I played a game a few days ago and it had an option where you can enable update the car reflection. If that option were enabled you would see a real enviroment reflection on the car, if not, you would only see a fake enviroment reflection. And that is what I am trying to do.

Matt, I am trying to do that but I don't know how to start. Since you already knows to to achieve this, could show how to do it with render to texture? Please.
Thanks.