On 8/25/25 12:25, Cousin Ricky wrote:
> Does anyone know how to get rid of that dark band across the spectrum
> above the light source?  It is not an object casting a shadow; it is the
> light source itself that is creating the shadow.  There is no such
> shadow in Bruno's render.

Most helpful will be increasing the media samples to say 10,10 or more.

There are secondary sampling frequency effects in play too: jitter 
on/off in the global_settings media block (use on); media jitter 
on/off(2); that official releases of POV-Ray have a banding effect in 
the media due how the photons are distributed - which has been removed 
in the yuqk branch (1); there are internal differences / fixes in media 
sampling between v3.7 and v3.8 - and of course AA.

Bill P.

(1) - Best guess is the photo deposit banding / shift effect was due 
some debug code added at some point and never removed.

(2) - The yuqk fork disables media 3 jitter because it does nothing but 
introduce 'more' noise given how the adaptive sampling works... And, at 
media container boundaries the jitter bleeds outside the container.

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