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I've just found following picture, but I don't know how to recreate this kind of crystal type reflection thing. Can anyone teach me please?

enter image description here

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    $\begingroup$ What do you exactly mean by saying "crystal type reflection"? $\endgroup$ – Carlo Jul 18 '15 at 10:20
  • $\begingroup$ i posted a BG and BI image just for the heck of it. $\endgroup$ – Scalia Jul 18 '15 at 15:04
  • $\begingroup$ Also look into (heh) the actual geometry of the eye: the iris and pupil are inset. This really changes the lighting. $\endgroup$ – wchargin Jul 18 '15 at 19:56
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As far as I can see in the picture and the material node provided from creator (which contain some errors in my opinion) the reflection is achieved by simply mixing a glossy shader and a diffuse shader.

The sharpness of the reflection is driven by the "Roughness" value of the shader:

enter image description here

High Roughness value

enter image description here

Low Roughness value

enter image description here

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BI or BG

First of all, you need to choose a reflection image. (I love using city landscapes off of http://cgtextures.com/.

Then add a new texture and set the mapping to "reflection".

The image is calculated in realtime, so its 100% game functional (and looks beautiful)

enter image description here

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