POV-Ray : Newsgroups : povray.general : Feature I missed in old versions. Implemented now? Server Time: 16 Nov 2018 09:16:43 GMT
  Feature I missed in old versions. Implemented now? (Message 1 to 5 of 5)  
From: Arnero
Subject: Feature I missed in old versions. Implemented now?
Date: 24 Oct 2006 20:15:00
Message: <web.453e7358c633d40d52eeaae0@news.povray.org>
Hello everybody,

from time to time I use povray, but did not bother to ask, but now:

Is it possible to include materials with gain = laser medium = absorption
> 1 ?

Is it possible to use photon mapping to simulate optical pumping of the
gain medium

Is there any tool to render the raytraced image onto a polygonal
representation of the scene (unlit texture maps) for simple fly-throughs
and scene debugging?

Is it possible to use a fine representation of the spectrum for better
simulation of chromatic errors in lenses, or for simulation of a
spectrometer

Is it possible to use a wide spectrum with near infrared for simulation of
heat transfere in big glas blocks of telescopes primary mirros and UV for
simulation of
fluorescence

Is it possible to use PovRay as a design tool for lens systems (or Beamer
optics) and if not why not?

Have you integrated FreeSnell to simulate multilayer optics?

Arne Rosenfeldt


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From: Warp
Subject: Re: Feature I missed in old versions. Implemented now?
Date: 24 Oct 2006 20:53:40
Message: <453e7d54@news.povray.org>
Arnero <nomail@nomail> wrote:
> Is it possible to use photon mapping to simulate optical pumping of the
> gain medium

  You could try to give the object (which the photons are passing through)
a color higher than 1, but I have never tested whether that works in
practice.

> Is it possible to use a fine representation of the spectrum for better
> simulation of chromatic errors in lenses, or for simulation of a
> spectrometer

  You can fake the look of chromatic dispersion by using the 'dispersion'
feature in POV-Ray (see the documentation), but it's probably not even
close to the physically correct dispersion of real lenses.

> Is it possible to use PovRay as a design tool for lens systems (or Beamer
> optics) and if not why not?

  Only if you are not going to simulate chromatic aberration. If you need
to simulate that, then I don't think POV-Ray can do a physically correct
job in that field.

  (Ok, it may be possible to approximate reality by using trickery,
perhaps by using several light sources in the same place, each colored
differently and each in a light_group with a copy of the object otherwise
identical but with different IORs. However, I have never tried this kind
of thing, so I can't say for sure.)

> Have you integrated FreeSnell to simulate multilayer optics?

  Some kind of frensell reflection is supported in POV-Ray, but once again
I can't assure how physically correct it is.

-- 
                                                          - Warp


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From: Alain
Subject: Re: Feature I missed in old versions. Implemented now?
Date: 25 Oct 2006 01:20:53
Message: <453ebbf5$1@news.povray.org>
Warp nous apporta ses lumieres en ce 24/10/2006 16:53:
> Arnero <nomail@nomail> wrote:
>> Is it possible to use photon mapping to simulate optical pumping of the
>> gain medium

>   You could try to give the object (which the photons are passing through)
> a color higher than 1, but I have never tested whether that works in
> practice.
I have and it work. It was a prism with rgbt 2, it effectively multiplied the 
light by 16!

>> Is it possible to use a fine representation of the spectrum for better
>> simulation of chromatic errors in lenses, or for simulation of a
>> spectrometer

>   You can fake the look of chromatic dispersion by using the 'dispersion'
> feature in POV-Ray (see the documentation), but it's probably not even
> close to the physically correct dispersion of real lenses.
Ok if you want a continuous spectrum.

>> Is it possible to use PovRay as a design tool for lens systems (or Beamer
>> optics) and if not why not?

>   Only if you are not going to simulate chromatic aberration. If you need
> to simulate that, then I don't think POV-Ray can do a physically correct
> job in that field.
It's usualy "close enough", you need the correct dispersion for the material you 
want. You can increase the dispersion_samples to get smoother results.
The real problem is that you can't simulate birefringense.

>   (Ok, it may be possible to approximate reality by using trickery,
> perhaps by using several light sources in the same place, each colored
> differently and each in a light_group with a copy of the object otherwise
> identical but with different IORs. However, I have never tried this kind
> of thing, so I can't say for sure.)

>> Have you integrated FreeSnell to simulate multilayer optics?

>   Some kind of frensell reflection is supported in POV-Ray, but once again
> I can't assure how physically correct it is.



-- 
Alain
-------------------------------------------------
Drive A: not responding.. .Formating C: instead


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From: Arnero
Subject: Re: Feature I missed in old versions. Implemented now?
Date: 26 Oct 2006 03:25:01
Message: <web.454028fbc1cccb6899f929260@news.povray.org>
>You could try to give the object (which the photons are passing through)
>a color higher than 1, but I have never tested whether that works in
>practice.
That gave an error at parsing.

> Ok if you want a continuous spectrum.
The dispersion feature looks good, I will have to try it with a series of
two prisms.

> The real problem is that you can't simulate birefringense.
Birefringence is hard to code at the beginning but easy to inlude into a
raytracer, why is it not implemented?

> >   Some kind of frensell reflection is supported in POV-Ray, but once again
It does not support soap-bubbles or AR-coated eyeglasses.

I do not want to learn two programs if I think a single raytracer will give
me nice pictures for presentations and correct simulations of my optics. Or
am I the only one, who "builds" (simple) optical devices and knows PovRay?


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From: Arnero
Subject: Re: Feature I missed in old versions. Implemented now?
Date: 26 Oct 2006 09:30:01
Message: <web.45407f0cc1cccb6899f929260@news.povray.org>
"Arnero" <nomail@nomail> wrote:
> >You could try to give the object (which the photons are passing through)
> >a color higher than 1, but I have never tested whether that works in
> >practice.
Sorry I overlooked the above answere


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