"Ard" <ard### [at] waikatoacnz> wrote in message 
news:web.42bca198bd7481d39a0bf9720@news.povray.org...
>> That is such a strange behaviour -- and a scene-breaker.  I've never used
> [...]
>> Is it known if this issue is tested for in the Pov-Ray 3.7 beta?
> [...]
>> What I should have said:  In that scene, the green box is "burnt right
>> through" by the cylindrical light behind it when the "interior {media}" 
>> line
>> is used, but is correct with media commented out.
>
> In the more complicated scene that first displayed this behaviour, one
> object *was* mapped on top of the black disc.  It was about 0.1u behind 
> the
> aperture, in a light_group lit by a source about 0.05u away - the
> extremely-brightly lit insides of the real-world spotlight behind the
> origin of the POV cylindrical light.  So some things do show through.  Not
> that that makes any difference, but it's another observation to throw on
> the pile.
>
> Anyway, how can I bring this to the attention of the developers (my
> apologies for not recognising you, if you are one) and make sure it is
> tracked?

Thanks, but I'm only another ordinary user.

All the same, I was curious about the question of will this be fixed in 3.7, 
so today I checked in povray.beta-test and on www.povray.org/beta and in the 
release and change notes.  There was quite a bit of work going on in media 
code in April, with many change entries particularly by Thorsten and some by 
Nathan and Chris.  No explicit description of this cylinder lights in media 
problem, but a possible candidate among others is a comment by Thorsten in 
change 3587: "Some cutting on light tests in media".

So I downloaded the Win32 3.7 beta6 version to check it, and I'm happy to 
report the problem has been fixed in 3.7.

Out of interest, I tried this scene out in PovRay 3.5, and it gave the black 
circles like 3.6.1 and 3.6.1a do.  So the bug has been around a while.  Of 
course, don't expect to see a final release of 3.7 for some months, it's 
still in beta with some features disabled, and once Beta finally passes, 
there's still the series of Release Candidates to get through!

But ONE DAY we can have cylinder spots in our virtual discos!

 :-)

Cheers,
  Brian

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JYR nous apporta ses lumieres en ce 2005-06-24 22:12:
> "Ard" <ard### [at] waikatoacnz> wrote:
> 
>>I'm not sure that my problem is the same as
>>Burki's, or at least the solution isn't the same.
> 
> 
> Oops... i apologize, my answer was definitely not relevant. Clearly not the
> same issue. I see that others played with your scene today, and i can't
> quite come up with a better idea... :(
> I even tried to constrain the media inside the cylinder you wish to see and
> locate the light_source slightly outside... to no avail. It seems that the
> location of the light_source does NOT have to be IN the media for this
> artifact to show up.
> 
> JYR
> 
> 
> 
It's definitely NOT a case of infinite ray! There is a plane at Z*1. the longets ray
are less than 3 
units long, at the corners.

Alain

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"Brian Elliott" <NotForSpam@AskIfUWant> wrote:

> I'm happy to report the problem has been fixed in 3.7.

Are you sure?  When I render my original demo, or yours without the
looks_like objects, objects behind or in front of the aperture render
correctly, but the media mapped on top of the aperture does not.  It's as
though the light is being emitted from the inside surface of the cylinder,
rather that from the outside surface.  Instead of black discs I'm getting
grey ones.

> don't expect to see a final release of 3.7 for some months

I started this project 15 years ago on an Amiga so a few months more won't
kill it :-}

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"Ard" <ard### [at] waikatoacnz> wrote in message 
news:web.42bde0abbd7481d39bd64a230@news.povray.org...
> "Brian Elliott" <NotForSpam@AskIfUWant> wrote:
>
>> I'm happy to report the problem has been fixed in 3.7.
>
> Are you sure?  When I render my original demo, or yours without the
> looks_like objects, objects behind or in front of the aperture render
> correctly, but the media mapped on top of the aperture does not.  It's as
> though the light is being emitted from the inside surface of the cylinder,
> rather that from the outside surface.  Instead of black discs I'm getting
> grey ones.

Oops you are right.  I only paid attention to the black hole "burn-through", 
not the media effect.  So I made a minimal scene out of it and posted a 
report in povray.beta-test -- hope you don't mind me taking that liberty.

>> don't expect to see a final release of 3.7 for some months
>
> I started this project 15 years ago on an Amiga so a few months more won't
> kill it :-}
>
>
>

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