William F Pokorny <ano### [at] anonymousorg> wrote:
> On 6/23/22 22:33, Chris R wrote:
> >   Would you prefer it in bug reports, sources, or here in the
> > images newsgroup?
>
> Either OK for me. For future reference a post to bug reports with some
> sort of pointer or mention of this thread in binary images is likely
> better.
>
> ---
> Given you do put everything into a scene union, it'd be worth trying a
> render where you include the transparent box at outside the union. You'd
> do this by commenting your box ID reference or raw box code inside the
> union and then include the box code as you posted it at the bottom of
> your scene file. (Supposing no transforms on the union itself)
>
> Trying something other than a quartic for the spout water drop would
> tell us something too. I've run across some quartic specific code
> somewhere - csg code perhaps...
>
> Alain's idea about coincident surfaces as a cause is one scenario in my
> head for an extra surface(a) due order reduction causing trouble, but
> the image doesn't look quite right for it to me. However, if your wall
> texture itself mirrors across the ground plain who knows...
>
> (a) - In it, the additional order reduction surface - you might not know
> you have - becomes the one of the coincident surfaces.
>
> Hmm, Have you tried a render where you remove the reflection block from
> finish block of the spout water drop?
>
> Bill P.

I was able to create a simple example with the same problem and posted it in the
bug reports news group:

http://news.povray.org/povray.bugreports/thread/%3Cweb.62b9bd71ec325a4a89a9c4065cc1b6e@news.povray.org%3E//povray.bugre
ports/thread/%3Cweb.62b9bd71ec325a4a89a9c4065cc1b6e@news.povray.org%3E/

In the example, I removed the outer union of all objects in the scene and the
bug remained.  I was also able to remove the normal and finish elements of the
water drip without changing the results.  Removing the interior { ior 1.33 },
however, caused both the drip and the box to disappear from the scene.

Also, the test scene has the box resting 0.1 units above the ground plane, so
there shouldn't be any coincident surfaces.

-- Chris R.

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