St. wrote:
>    Are you sure it was a black pearl the diamonds were set into? If so, 
> then I would expect a thin gold setting around the diamond to hold the 
> diamond securely.

I assume there was a thin gold setting then .. as the piece was worth 
half a small fortune!

Thanks!

Rick Measham

Post a reply to this message

Rick Measham <rickm*at%isite.net.au> wrote:
> St. wrote:
> >    Are you sure it was a black pearl the diamonds were set into? If so,
> > then I would expect a thin gold setting around the diamond to hold the
> > diamond securely.
>
> I assume there was a thin gold setting then .. as the piece was worth
> half a small fortune!
>
> Thanks!
>
> Rick Measham


Rick, how is the ambient_light's value? its may be zero..

Hasan.

Post a reply to this message

Rick Measham wrote:
>> The image following has photons set with this:

OK, here's the latest version ..

Q: How do I give an idea of the scale?

Notes:
- I've used/changed the texture provided by 'ts'
- I've changed the light to an area_light (always intended)
- I've turned off radiosity .. don't think it's really needed
- I've turned off the photons .. I like it already :)

Thoughts/Comments/Suggestions always welcome. Source available on request.

Cheers!
Rick Measham

Post a reply to this message

Attachments:
Download 'blackpearl.jpg' (22 KB)

Preview of image 'blackpearl.jpg'

> Q: How do I give an idea of the scale?
You could put it against a wooden surface with an appropriate grain, or
have a macroscopic background (maybe of a room you have done in the
past) heavily focus-blurred. You could attach a slender chain or thread
to it, or have some visible skin near it (a finger, a neck) if you are
feeling like spending a lot of time on the background.

-- 
But like the blackbird on the wire    And like the blackbird on the wire
I will not take the prey on you    [ surreal ]       I just watch you by
You wouldn't want me to            [ .istic. ]  The tears I knew I'd cry
For I am too soft for such a thing [   org   ] Fall unnoticed down below

Post a reply to this message

Daniel Hulme <pho### [at] isticorg> wrote:
> > Q: How do I give an idea of the scale?
> You could put it against a wooden surface with an appropriate grain, or
> have a macroscopic background (maybe of a room you have done in the
> past) heavily focus-blurred. You could attach a slender chain or thread
> to it, or have some visible skin near it (a finger, a neck) if you are
> feeling like spending a lot of time on the background.
you could just hang it from an ear, like the girl with a pearl earring in
this year's POVCOMP.
Now we can see the pink diamonds it's clear why it would be so expensiVe!
I would expect a black pearl to have an iridescent surface, and may be some
irregularity of shape.
Joanne
http://www.onewhiteraven.com

Post a reply to this message

Rick Measham <rickm*at%isite.net.au> wrote:
> Rick Measham wrote:

> Notes:
> - I've used/changed the texture provided by 'ts'

i may have messed up on that code Rick ...
try the following instead ...
playing with the variable "Trans" to tweak the transparency.

//------- Pearlescent Texture -----------
#declare Rmin=.1;
#declare Rmax=.33;
#declare Trans=.5; //Alter transmission of outer texture
#declare T_inner=White; #declare T_outer=Black; // *****
//#declare T_inner=Silver; #declare T_outer=Black;
//#declare T_inner=Yellow; #declare T_outer=Red; //easier to see the results
in color

#declare TOpal=
    texture{pigment{rgb T_inner} finish{specular 1 metallic roughness .1
brilliance 25}}
    texture{pigment{rgb T_outer transmit Trans}
      finish{specular 1 roughness .0125 diffuse 1-Rmax reflection{Rmin,Rmax}
conserve_energy}
    }

The attached file shows the results of using White as the inner
texture and transparent Black as the outer ...
the upper left sphere being the inner texture alone ...
then with Black at 0.9 transmit, 0.8 going left to right ...
the 2nd row down 0.7, 0.6, 0.5 ... ect all the way to 0 transparency
bottom center.
It may be easier to see if you uncomment the Yellow/Red pigment line above
....
and of course one can use Silver or even one of the Metal textures for
the inner.

I haven't tried adding a bump normal ...
not sure one can with layer textures.
and suggestions in that area would be appreciated.

> Thoughts/Comments/Suggestions always welcome. Source available on request.
>
> Cheers!
> Rick Measham

sure ... please do post the source ...
I never have done well using diamonds so ...
would appreciate if you could point me in the right direction.

-ts-

Post a reply to this message

Attachments:
Download 'blackpearl.jpg' (87 KB)

Preview of image 'blackpearl.jpg'

"Rick Measham" <rickm*at%isite.net.au> wrote in message 
news:43588dd1@news.povray.org

  Much, much better. Try changing to a darker colour, 'black pearl' means 
black pearl. Also, when I said there would be a gold rim around the stone to 
hold it, it would probably be white gold, or, if it's that expensive, 
platinum, (a bright-white colour - chrome would suffice).

     You need to work on the eyelet too - there wouldn't be a gap...  ;)

    As for scale, put them, (a pair, as earrings, or one as a pendant), in a 
presentation box on a table.

    I'll also go with Joannes input that there should be slight 
irregularities here and there, (small bumps etc.)

     ~Steve~

Post a reply to this message

"St." <dot### [at] dotcom> wrote in message news:43591d29@news.povray.org...

   Ah, there you go, ts got it right with that last pearl texture. Nice one 
ts! :)

    ~Steve~

Post a reply to this message

ts wrote:
> i may have messed up on that code Rick ...
> try the following instead ...
> playing with the variable "Trans" to tweak the transparency.

Closer, closer, ever closer... thanks ts!

Clasp is getting closer too.

Cheers!
Rick Measham

Post a reply to this message

Attachments:
Download 'blackpearl.jpg' (34 KB)

Preview of image 'blackpearl.jpg'

Rick Measham <rickm*at%isite.net.au> wrote:
> ts wrote:
> > i may have messed up on that code Rick ...
> > try the following instead ...
> > playing with the variable "Trans" to tweak the transparency.
>
> Closer, closer, ever closer... thanks ts!
>
> Clasp is getting closer too.
>
> Cheers!
> Rick Measham

yes.
although, with zero transmit ...
you are going to miss out on the translucence ...
because then the interior layer is not seen at all.
so perhaps using a somewhat less white underlayer ...
along with playing with the specular ...
will allow you to use at least some transparency
in the black outer texture.
also ... in my example there is nothing for the
pearl to reflect ... whereas in yours, there are
lighter things which will also lighten the surface.
so you may want to lower the reflection of that
outer texure as well.
i have found that the lighting, skysphere and even
background greatly alter the effect precisely because
they do get reflected. no problem  except when you
want black. ;)
so it takes a lot of tweaking and fine tuning for
any other changes you make in the scene.
if you want to emphisize the 'black' of the pearl ...
you will have to minimize what is there for it
to reflect.

looking good.

-ts-

Post a reply to this message