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Why 5? 
Posted: 26 February 2009 07:03 AM   [ Ignore ]   [ # 16 ]
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One of bloggers has posted a picture of “insides” of Surface. It shows the position of 5 cameras inside it.

Cameras.png

As you can see - 4 cameras is used to get image. 5th camera is used to workaround light reflections.

Source: http://surfacedeveloper.blogspot.com/2009/02/surface-training_24.html

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