I'm sort of a rock collector. I've thought about trying to render a cluster,
but it sounds like an awfully hard task... (depending on the mineral being
rendered, of course -- don't even think about Barite or Bismuth!)

--
David Fontaine     <dav### [at] faricynet>     ICQ 55354965
Please visit my website: http://www.faricy.net/~davidf/

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Bimuth would be a task alright. Apophyllite should make an interesting render.

David Fontaine wrote:

> I'm sort of a rock collector. I've thought about trying to render a cluster,
> but it sounds like an awfully hard task... (depending on the mineral being
> rendered, of course -- don't even think about Barite or Bismuth!)
>
> --
> David Fontaine     <dav### [at] faricynet>     ICQ 55354965
> Please visit my website: http://www.faricy.net/~davidf/

--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit my isosurface tutorial at http://members.aol.com/stbenge

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Yes... bismuth looks really hard.  I have a picture of a piece in a book on
rocks and minerals.
Brendan Ryan

David Fontaine wrote:

> I'm sort of a rock collector. I've thought about trying to render a cluster,
> but it sounds like an awfully hard task... (depending on the mineral being
> rendered, of course -- don't even think about Barite or Bismuth!)
>
> --
> David Fontaine     <dav### [at] faricynet>     ICQ 55354965
> Please visit my website: http://www.faricy.net/~davidf/

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Could the crystal's faces be made imperfectly like the ones in the picture
that I scanned in?  The faces at the tip are of different sizes.  The bottom
has a milky color.  The tip is a little rounded.
Brendan Ryan

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Attachments:
Download 'quartz3.jpg' (13 KB)

Preview of image 'quartz3.jpg'

Ah, yours looks like it has been in a creek or a wash for a length of time. :)
The top faces on mine are imperfect, that is they are all different sizes. I
choose how different the sizes are from one-another. As for the rounded tip on
yours, it's that way because it has been damaged (as if you didn't know :).
That damaged tip could be accomplished by intersecting the crystal with another
noise3d isosurface. I tried to get the milky color to be as bright as yours
(and many of the ones I have), but the media just wouldn't brighten up. It
would get brighter near the top, but darker when it cast a shadow in itself.

Brendan Ryan wrote:

> Could the crystal's faces be made imperfectly like the ones in the picture
> that I scanned in?  The faces at the tip are of different sizes.  The bottom
> has a milky color.  The tip is a little rounded.
> Brendan Ryan

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On Wed, 05 Jul 2000 09:36:15 -0700, SamuelT <STB### [at] aolcom> wrote:

>I tried to get the milky color to be as bright as yours
>(and many of the ones I have), but the media just wouldn't brighten up. It
>would get brighter near the top, but darker when it cast a shadow in itself.

Is it scattering media you're using? If so, did you try lowering
extinction?


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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A quote from the official POV-Ray docs.
Brendan Ryan

Note a strange design side-effect was discovered during testing and it was too
difficult to fix. If the enclosing object uses transmit rather than filter for
transparency, then the media casts no shadows. For example:

 object{MyObject pigment{rgbt 1.0} interior{media{MyMedia}}} //no shadows
 object{MyObject pigment{rgbf 1.0} interior{media{MyMedia}}} //shadows



Peter Popov wrote:

> On Wed, 05 Jul 2000 09:36:15 -0700, SamuelT <STB### [at] aolcom> wrote:
>
> >I tried to get the milky color to be as bright as yours
> >(and many of the ones I have), but the media just wouldn't brighten up. It
> >would get brighter near the top, but darker when it cast a shadow in itself.
>
> Is it scattering media you're using? If so, did you try lowering
> extinction?
>
> Peter Popov ICQ : 15002700
> Personal e-mail : pet### [at] usanet
> TAG      e-mail : pet### [at] tagpovrayorg

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Thanks! I'll try lowering extinction, and that should give me some beautiful
'cloud' inclusions.

Peter Popov wrote:

> On Wed, 05 Jul 2000 09:36:15 -0700, SamuelT <STB### [at] aolcom> wrote:
>
> >I tried to get the milky color to be as bright as yours
> >(and many of the ones I have), but the media just wouldn't brighten up. It
> >would get brighter near the top, but darker when it cast a shadow in itself.
>
> Is it scattering media you're using? If so, did you try lowering
> extinction?
>
> Peter Popov ICQ : 15002700
> Personal e-mail : pet### [at] usanet
> TAG      e-mail : pet### [at] tagpovrayorg

--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit my isosurface tutorial at http://members.aol.com/stbenge

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On Wed, 05 Jul 2000 21:45:56 -0400, Andrea Ryan <ary### [at] global2000net>
wrote:

>A quote from the official POV-Ray docs.
>Brendan Ryan
>
>Note a strange design side-effect was discovered during testing and it was too
>difficult to fix. If the enclosing object uses transmit rather than filter for
>transparency, then the media casts no shadows. For example:
>
> object{MyObject pigment{rgbt 1.0} interior{media{MyMedia}}} //no shadows
> object{MyObject pigment{rgbf 1.0} interior{media{MyMedia}}} //shadows

Thanks, Brendan, but Samuel said the media casts a shadow on itself so
the container's transparency type is not the matter here. Unless...
unless you mean to give it filter *and* a little transmt? Is that what
you have in mind? I haven't tried it, it might just work.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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I did several images once of clusters of quartz crystals with gold embedded in
the matrix.  Fun stuff!

David Fontaine wrote:

> I'm sort of a rock collector. I've thought about trying to render a cluster,
> but it sounds like an awfully hard task... (depending on the mineral being
> rendered, of course -- don't even think about Barite or Bismuth!)
>
> --
> David Fontaine     <dav### [at] faricynet>     ICQ 55354965
> Please visit my website: http://www.faricy.net/~davidf/

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