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15 Nov 2024 18:24:17 EST (-0500)
  crystal test (Message 1 to 4 of 4)  
From: Mienai
Subject: crystal test
Date: 27 Oct 2005 01:55:01
Message: <web.43606ba93325be9861e24bb0@news.povray.org>
Trying to make some crystals  The interior is just scattering media, no fade
color.  Trying to figure out a good way to get rid of the red where the
media hits the surface, any ideas?


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From: Tim Nikias
Subject: Re: crystal test
Date: 27 Oct 2005 03:19:08
Message: <43607f6c@news.povray.org>
> Trying to make some crystals  The interior is just scattering media, no
fade
> color.  Trying to figure out a good way to get rid of the red where the
> media hits the surface, any ideas?

What red? I see none in the image.

If you're referring to scattering's behaviour that the opposite color will
appear in the "shadowed" region of the media, then here's my approach: use
scattering without any extinction whatsoever, and add an absorption media
into the same media{}-statement. This way, you can influence the color
better.

Regards,
Tim

-- 
aka "Tim Nikias v2.0"
Homepage: <http://www.nolights.de>


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From: dlm
Subject: Re: crystal test
Date: 27 Oct 2005 22:15:24
Message: <436189bc$1@news.povray.org>
Its the nature of crystals to be orderly to perfect. This looks more like 
something moulded with muck in it. If it's meant to be crystalline then drop 
the swirlies. Unpolished mineral crystals have torn up surfaces but often 
near-perfect interiors with perhaps a few inclusions.
DLM - some-time crystallographer.


<Mienai> wrote in message 
news:web.43606ba93325be9861e24bb0@news.povray.org...
> Trying to make some crystals  The interior is just scattering media, no 
> fade
> color.  Trying to figure out a good way to get rid of the red where the
> media hits the surface, any ideas?
>


--------------------------------------------------------------------------------


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From: Mienai
Subject: Re: crystal test
Date: 28 Oct 2005 13:45:00
Message: <web.436262e86083156693db03e80@news.povray.org>
"dlm" <me### [at] addressinvalid> wrote:
> Its the nature of crystals to be orderly to perfect. This looks more like
> something moulded with muck in it. If it's meant to be crystalline then drop
> the swirlies. Unpolished mineral crystals have torn up surfaces but often
> near-perfect interiors with perhaps a few inclusions.
> DLM - some-time crystallographer.


The idea wasn't to make something like a precious gem but more along the
lines of a translucent crystal with veins such as quartz, which I've seen
many similar to this but not in blue.


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