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I was in my elevator when i saw this... enter image description here

As you can see here that reflections are kind of stretched. What causes this? And how can we achieve something like this in computer graphics?

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    $\begingroup$ That is an anisotropic specular reflection (dominant in 1 direction), an effect usually from brushed metals. $\endgroup$ – PaulHK Mar 27 '17 at 5:37
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    $\begingroup$ check here > sungsoo.github.io/papers/brdf-mdf.pdf $\endgroup$ – PaulHK Mar 27 '17 at 6:34

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