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Normalization CubeMap vs normalize()

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Hi all! A few days ago I made a demo of dot3bump. When i made the pixel shader, i used the normalize function instead of normalization cubemap. In some forums i had read that in new graphics cards there aren't differences in performance. Is this true? Another question : When i build the vertexs buffers and i found one vertex with two different uv coordinates, there are another solution more efficient than duplicate the vertex? Thxs for replys. PD: Sry for my english. PD: U can view some images of the demo here (Spanish) : http://beerss.spaces.live.com/

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Don't listen to whatever is written in this paper. As you might have noticed, it is from 2004, and is about the Geforce FX. Todays GPUs have totally different performance characteristics than these old cards.

Today, there is almost no reason to ever use a normalization cubemap anymore.

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