On 5/6/20 11:47 AM, Nicolas George wrote:
> 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.
> 
Have you looked at bounding mode 2 (+bm2)? If not that's worth a shot.

Related: There are issues in v37 and the official v38 branch - mitigated 
'somewhat' in my povr solver branch - with tiny sphere intersections 
getting dropped when they should not be. Applies to a few other objects 
too a situations too. Depends on exactly how the rays approach.

This can affect Anti-Aliasing time somewhat substantially because the 
spheres are basically blinking in and out of existence...  There is, 
IIRC, some related discussion buried in the github pull req #358 comments.

https://github.com/POV-Ray/povray/pull/358

Bill P.

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