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2 Jun 2024 11:45:49 EDT (-0400)
  Parallel Cylinder Lights (Message 1 to 6 of 6)  
From: Crippso
Subject: Parallel Cylinder Lights
Date: 6 Apr 2012 06:00:01
Message: <web.4f7ebdd1766cf70130037650@news.povray.org>
Is it possible to combine the parallel keyword with a cylindrical light to give
parallel light rays contrained by the cylinder?

Thanks
Stuart


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From: clipka
Subject: Re: Parallel Cylinder Lights
Date: 6 Apr 2012 09:09:32
Message: <4f7eeb0c$1@news.povray.org>
Am 06.04.2012 11:56, schrieb Crippso:
> Is it possible to combine the parallel keyword with a cylindrical light to give
> parallel light rays contrained by the cylinder?

The light rays of a cylinder light source are always parallel.


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From: Crippso
Subject: Re: Parallel Cylinder Lights
Date: 6 Apr 2012 14:00:01
Message: <web.4f7f2eb895d1506e130037650@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 06.04.2012 11:56, schrieb Crippso:
> > Is it possible to combine the parallel keyword with a cylindrical light to give
> > parallel light rays contrained by the cylinder?
>
> The light rays of a cylinder light source are always parallel.

thanks clipka,

is that definately true? the help files seem to suggest cylinder light actually
uses diverging rays from the location point and that the cylinder just contrains
the rays within the diameter specified.


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From: clipka
Subject: Re: Parallel Cylinder Lights
Date: 8 Apr 2012 11:37:15
Message: <4f81b0ab$1@news.povray.org>
Am 06.04.2012 19:58, schrieb Crippso:

>> The light rays of a cylinder light source are always parallel.
>
> is that definately true? the help files seem to suggest cylinder light actually
> uses diverging rays from the location point and that the cylinder just contrains
> the rays within the diameter specified.

I wasn't sure myself until I tested it. The documentation is apparently 
misleading there.


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From: Alain
Subject: Re: Parallel Cylinder Lights
Date: 8 Apr 2012 13:43:05
Message: <4f81ce29$1@news.povray.org>

> Is it possible to combine the parallel keyword with a cylindrical light to give
> parallel light rays contrained by the cylinder?
>
> Thanks
> Stuart
>
>

It's possible, but, as clipka posted, may not be required.

The only time where it can make a difference is when you use photons.


Alain


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From: Crippso
Subject: Re: Parallel Cylinder Lights
Date: 10 Apr 2012 11:00:01
Message: <web.4f8449e995d1506e60b91f590@news.povray.org>
Alain <aze### [at] qwertyorg> wrote:

> > Is it possible to combine the parallel keyword with a cylindrical light to give
> > parallel light rays contrained by the cylinder?
> >
> > Thanks
> > Stuart
> >
> >
>
> It's possible, but, as clipka posted, may not be required.
>
> The only time where it can make a difference is when you use photons.
>
>
> Alain

Thanks for the help guys


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