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From: Mark Hanford
Subject: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 15:27:29
Message: <3d5ff521@news.povray.org>
I've been trying to use cylinder lights to create a search-light effect,
using atmospheric media.  I have noticed that the end of the cylinder light
shows as a black disk, rather than just 'running out'.

Is this normal?  Can I stop this?

thanks

Mark


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From: 25ct
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 15:47:52
Message: <3d5ff9e8$1@news.povray.org>
Your image isn't showing Mark. At least for me that is...

  ~Steve~


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From: Mick Hazelgrove
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:03:58
Message: <3d5ffdae@news.povray.org>
I had this problem too but I vaguely remembered this cropping up before and used a
tight cone instead.

Mick


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From: ingo
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:11:08
Message: <Xns926EE25F618B4seed7@povray.org>
in news:3d5ff9e8$1@news.povray.org 25ct wrote:

> Your image isn't showing Mark. At least for me that is...

Rename the extension to .bmp

Ingo


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From: Christopher James Huff
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:13:45
Message: <chrishuff-A88E20.15004018082002@netplex.aussie.org>
In article <3d5ff521@news.povray.org>,
 "Mark Hanford" <mar### [at] theinternetcom> wrote:

> I've been trying to use cylinder lights to create a search-light effect,
> using atmospheric media.  I have noticed that the end of the cylinder light
> shows as a black disk, rather than just 'running out'.
> 
> Is this normal?  Can I stop this?

This probably has something to do with how intervals are split up to 
optimize rendering for spotlights and cylinder lights and the fact that 
your media is infinite. Simple answer: don't use atmospheric media, use 
some kind of comtainer.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/


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From: Mark Hanford
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:15:49
Message: <3d600075$1@news.povray.org>
oops.  Sorry...

"ingo" <ing### [at] homenl> wrote in message
news:Xns### [at] povrayorg...
> in news:3d5ff9e8$1@news.povray.org 25ct wrote:
>
> > Your image isn't showing Mark. At least for me that is...
>
> Rename the extension to .bmp
>
> Ingo


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From: Mark Hanford
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:17:11
Message: <3d6000c7$1@news.povray.org>
But wouldn't this start as a point?  I need a visible diameter at the lamp
end of the beam.

Ideally I wanted a spotlight, but couldn't see how to make the start of it
wide enough.

Mark

"Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> wrote in message
news:3d5ffdae@news.povray.org...
> I had this problem too but I vaguely remembered this cropping up before
and used a tight cone instead.
>
> Mick
>
>
>


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From: Mark Hanford
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:22:42
Message: <3d600212$1@news.povray.org>
Hmmm,

I just tried a sphere{0,15 interior{media{...}}} instead of atmospheric
media, with the same problem

Mark

PS

here is the media
sphere{
  0, 20
  interior{
    media {
      intervals 10
      samples 1,1
      confidence 0.9
      variance 1.0/128
      ratio 0.9
      scattering {
        1,
        rgb<0.05,0.05,0.05>
      }
      method 3
    }
  }
  hollow
}

"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3d5ff521@news.povray.org>,
>  "Mark Hanford" <mar### [at] theinternetcom> wrote:
>
> > I've been trying to use cylinder lights to create a search-light effect,
> > using atmospheric media.  I have noticed that the end of the cylinder
light
> > shows as a black disk, rather than just 'running out'.
> >
> > Is this normal?  Can I stop this?
>
> This probably has something to do with how intervals are split up to
> optimize rendering for spotlights and cylinder lights and the fact that
> your media is infinite. Simple answer: don't use atmospheric media, use
> some kind of comtainer.
>
> --
> Christopher James Huff <cja### [at] earthlinknet>
> http://home.earthlink.net/~cjameshuff/
> POV-Ray TAG: chr### [at] tagpovrayorg
> http://tag.povray.org/


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From: ingo
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:28:41
Message: <Xns926EE55992364seed7@povray.org>
in news:3d600212$1@news.povray.org Mark Hanford wrote:

> sphere{
>   0, 20
    
    put a transparent pigment here

>   interior{
> 

or else you'll se the container object with the default (black) texture.

Ingo


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From: 25ct
Subject: Re: Cylinder lights have a black end-cap?
Date: 18 Aug 2002 16:35:51
Message: <3d600527@news.povray.org>
"ingo" <ing### [at] homenl> wrote in message
news:Xns### [at] povrayorg...
> in news:3d5ff9e8$1@news.povray.org 25ct wrote:
>
> > Your image isn't showing Mark. At least for me that is...
>
> Rename the extension to .bmp

     Thanks Ingo, got it now.

     ~Steve~

>
> Ingo


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