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Glass effect (Ogre)

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[size="4"]I want to make glass posteffect like in ogre demo.
Unfortunately I did find nothing. Maybe there are some papers or shaders.
Also, it is interensing to know the principle of this effect.

[attachment=2451:GlassEffect.jpg]

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in this screen u see a simple refraction shader, it is really just simple phisics.
http://en.wikipedia.org/wiki/Refraction

What u need:
  • surface normal(in,out)
  • light direction
  • thinkness of material
    u probably don't need a perfect phisic simulation so u can cut some corners.

    Just google for refraction shaders(like in water rendering)

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