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The short answer is that the standard perspective projection has a side effect of focusing Z resolution near the camera, which is actually beneficial. A perspective projection turns out to be linear in 1/Z rather than Z, meaning that there are very large changes in Z near to the camera, but smaller changes as the distance increases. Here's an article ...


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He too those numbers, because of the same reason some people uses 800 * 600 for computers. It is one of the smallest screen size wich can be found on the market. It's just easier to handle, than something like 1600 * 900.



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