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Gravitational Lensing

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Yeah, inspiration comes from movie :)
Unfortunately there is no chance to calculate lighting in real-time, even only with single scattering. Calculate lighting in heterogenious particifaping media is one of the most hard problems of CG. There is no analitical solution and huge gravitational force which bends rays complicates things even more. So I may write offline rendering of this scene in future but now this shader shows basic, gravitational lensing part without lighting. This shader is written with huge help of BlackRainbow, guy from blender community. He rendered this scene in blender
http://blenderartists.org/forum/showthread.php?360261-Gargantua

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