this is only a quick hack I did, when I saw the post of Tom A.

I don't know, how fast his ISO solution renders, but I used
a version, that uses transparent spheres around the camera,
"only" with a normalmap.

The MPG is killig a lot details here, I've to admit this
version isn't yet, what I'm after.
But I've currently a version running, with better params, that will
be ready in some hours, so I can post it tomorrow.

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