Cycles: Encapsulation of portals, black holes, 'ray instances', and other delights

Coding Beginning Blender Code and Development
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As a “wandering aimlessly”, I made a cool, but strange and
a narrowly focused thing that I have nowhere and no one to share with it.

So I’ll just leave it here for the purpose of “additional history fixation” (like I was the first to come up with this), as well as for the sake of a place where someone who once watched it can discuss on high-level it here.

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And I also have an idea to store “custom attributes” for each ray. This will allow you to do some more specific-interesting tricks.