"Funny thing is that RaydreamStudio had it 10 years ago. It was a render filter applied after the image was rendered." RayDream was always a step ahead of the game! Again, it's always applied as a render filter or camera effect. Even in the most high end apps. As was pointed out, it could be "faked" with different methods to varying degrees of success. I loved RayDream Studio. I learned how to model with it 5 or 6 years ago before moving on to 3dsMax. To this day, it still remains one of my all-time favorite applications. :-)

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.