Hi.

I have a scene made of 200k spheres merged on a path (like a sphere_sweep,
but with changing pigment and a ringed look), few are big, many are tiny and
barely visible. Unsurprisingly, it is taking forever to render.

I am looking for ways to speed it up.

My attempt was to group the spheres in sub-merges, and let POV-Ray compute
bounding boxes for these groups. It helps, a little, but not much. Not
enough to make the scene possible.

My next attempt would probably be to try to add explicit bounded_by on the
groups.

I could experiment by myself, but people here probably have insight: do you
have advice on the most efficient way to speed this up?

Thanks in advance.

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