Looks great! I think the artifacts (if I have actually found them at all)
could be due to max_trace_level. Since the glass continues to reflect upon
itself, it would need a high MTL or it will hit the "roof" and turn black.
The window with the statistics after a rendering will say if the MTL was
reached.

And welcome. Your first post CAN, in fact, be said to fit the tradition.
It's 3 marble spheres on a checked floor - that is so big, you can't see the
other ..checks.. hmm.

Regards,
Hugo

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