> I'd like to know how easy/hard it is to achieve same results with
> POV-Ray. This is a really simple scene with just spheres and planes and
> reflection and refraction. And one spherical light source with warm
> light 10*Vector(1, 0.9, 0.6).

Not all that hard, it's just a matter of what settings are used. (24m)

> For my eyes this one looks very realistic in many ways. Not sure how
> much the graininess accounts for.

IMHO the graininess directly impacts the quality of a scene in
ways that make some surfaces appear to be textured (as in plaster)
and that it plays a trick on the mind, since the eye sees grain, but
interprets it as a textured surface instead of an artifact.

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