This is the same shape as in my "Another Quiz"
posting. This time there are 4 of them (as in 
the code for the solution), and now they are 
made of glass.

Please comment.

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Attachments:
Download 'flower.jpg' (62 KB)

Preview of image 'flower.jpg'

For a completely transparent object it really stands out against the
background, giving it a nice realism.

Bob

"Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
news:3923321F.96D34024@hotmail.com...
|
| This is the same shape as in my "Another Quiz"
| posting. This time there are 4 of them (as in
| the code for the solution), and now they are
| made of glass.
|
| Please comment.

Post a reply to this message

I agree about it standing out. Good composition. (And it's a symmetrical
object on an asymmetrical background, kind of a strange effect if you think
about it long enough.)
I bet the render time was loooooong...


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

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Quite a beautiful spectacle... A purple color to the glass/crystal with blue
or reddish streaks would look nice standing alone in a beam of light...

Tor Olav Kristensen wrote:

> This is the same shape as in my "Another Quiz"
> posting. This time there are 4 of them (as in
> the code for the solution), and now they are
> made of glass.
>
> Please comment.
>
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html
>
>   ------------------------------------------------------------------------
>  [Image]

Post a reply to this message

"Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
news:3923321F.96D34024@hotmail.com...
>
> This is the same shape as in my "Another Quiz"
> posting. This time there are 4 of them (as in
> the code for the solution), and now they are
> made of glass

    Must be an Orchid.

Post a reply to this message

Very elegant!

--
Jim

Check out my web site  http://www.kressworks.com/

Tor Olav Kristensen <tor### [at] hotmailcom> wrote in message
news:3923321F.96D34024@hotmail.com...
>
> This is the same shape as in my "Another Quiz"
> posting. This time there are 4 of them (as in
> the code for the solution), and now they are
> made of glass.
>
> Please comment.
>
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html


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

Post a reply to this message

Nice Image, esp. good model

Maybe you should try lighting from one side and a slight color for the
glass, even though it would destroy the symmetry.    

And How about turning it upside down :-)

Christoph


Tor Olav Kristensen wrote:
> 
> This is the same shape as in my "Another Quiz"
> posting. This time there are 4 of them (as in
> the code for the solution), and now they are
> made of glass.
> 
> Please comment.
> 
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html
> 
>   ------------------------------------------------------------------------
>  [Image]

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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Very nice... (well, okay, sooo nice that I saved it on my hard disk :)).
I find it a bit butterfly-like. 
Perhaps needs some colors, for a flower? Can we have a sample with more
colors?
Well, after all, maybe that's just me, so don't bother about that :))

Azrael
-- 
May all your dreams but one become true.

Azrael <azr### [at] chezcom>
http://www.chez.com/azrael

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Nice one.

What is your max_trace_level, and how long did it take to render ?

I see dark areas in the petals. Is it POV which stopped shooting rays or is it
your black background which is refracted ?

Tor Olav Kristensen a écrit :

> This is the same shape as in my "Another Quiz"
> posting. This time there are 4 of them (as in
> the code for the solution), and now they are
> made of glass.
>
> Please comment.
>
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html
>
>   ------------------------------------------------------------------------
>  [Image]

Post a reply to this message

Tor Olav Kristensen wrote:
> 
> This is the same shape as in my "Another Quiz"
> posting. This time there are 4 of them (as in
> the code for the solution), and now they are
> made of glass.
> 
> Please comment.

Very nice model, but I don't like the background colors much.

Also, real glass tends to exhibit variable reflection; in my own
experiments I've found that type 0 with a falloff power of 2 or so
provides a fairly realistic look (though it may not be mathematically accurate).

The highlights seem a little large in places.

-- 
Xplo Eristotle
http://start.at/xplosion/

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simply beautiful !

Regards,

Denis.


Azrael wrote:
> 
> Very nice... (well, okay, sooo nice that I saved it on my hard disk :)).
> I find it a bit butterfly-like.
> Perhaps needs some colors, for a flower? Can we have a sample with more
> colors?
> Well, after all, maybe that's just me, so don't bother about that :))
> 
> Azrael
> --
> May all your dreams but one become true.
> 
> Azrael <azr### [at] chezcom>
> http://www.chez.com/azrael

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Moon47 wrote:

> Quite a beautiful spectacle...

Thank you :)

> A purple color to the glass/crystal with blue
> or reddish streaks would look nice standing alone in a beam of light...

I'm afraid that I don't know enough yet about colouring glass in
POV-Ray like you describe.

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Bob Hughes wrote:

> For a completely transparent object it really stands out against the
> background, giving it a nice realism.

Thank you.

I first tried to view the shape from this angle as a non transparent
object,
but I found it a bit dull because the shape in front "blocked" for the
three
others behind.

And then I thought I'd give the marvellous T_Glass3 texture from the
glass.inc file a try.

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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David Fontaine wrote:

> I agree about it standing out. Good composition.

Thank you too.

> (And it's a symmetrical object on an asymmetrical background,
> kind of a strange effect if you think about it long enough.)

I did give this a little thought before I went to sleep. But I was
to tired to reach a conclusion, so I just started the rendering and
thought I would make up my mind when it had finished.

> I bet the render time was loooooong...

My home machine stood alone rendering for about 3 days.

But I forgot to look for the statistics when I returned, so I
don't know the exact rendering time. :(

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Bill DeWitt wrote:

>     Must be an Orchid.

Yes, when you mention it; the "thing" in the middle reminds
me of a kind of tongue.

Thank you for commenting.

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Jim Kress wrote:

> Very elegant!

I'm happy to hear that.

=)

Thank you!

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Christoph Hormann wrote:

> Nice Image, esp. good model

Thank you !

> Maybe you should try lighting from one side and a slight color for the
> glass, even though it would destroy the symmetry.

It's a pity that the long rendering time stops me from experimenting
much with lighting and colouring of the glass.

But if I find time (or I get a more powerful PC :) I'll try a more
asymmetric light set-up.

> And How about turning it upside down :-)

Right now I tried to flip the image vertically in an image editor and
I found that I like it that way too. =)


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Azrael wrote:

> Very nice...

Thank you !

> (well, okay, sooo nice that I saved it on my hard disk :)).

I'm glad to hear that.

> I find it a bit butterfly-like.

Yes; now I see that it could be a butterfly viewed from above... strange...

> Perhaps needs some colors, for a flower? Can we have a sample
> ith more colors?
>
> Well, after all, maybe that's just me, so don't bother about that :))

Maybe when I have learned more about colouring glass in POV-Ray.

> May all your dreams but one become true.

Hmmm ... which one of them ?        :)

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Denis Corbin wrote:

> simply beautiful !

If it's my image you are referring to then I'm flattered.

Thanks to you too !

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Fabien Hénon wrote:

> Nice one.

Thanks

> What is your max_trace_level,

It's POV-Ray default and I believe that is about 5 (?)

> and how long did it take to render ?

I'm not sure but I think it took 2-3 days on my 100 MHz Pentium
(800x600 pixels). (I just left it on when I had to leave home for 3 days.)

> I see dark areas in the petals. Is it POV which stopped shooting rays or is it
> your black background which is refracted ?

The black areas are because of the relatively low max_trace_level number

First I thought that I should increase this number, but then I remembered that
some glass images I rendered earlier looked nicer with some dark areas.

So I didn't change it for this rendering.
I now think that it helps in making the glass stand out from the background.

But I have now also increased the max_trace_level number to 20 just
to see how it looks. (And in a couple of days I'll now.)

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Xplo Eristotle wrote:

> Very nice model,

It seems that several people like this shape.
And again I'm flattered. Thank you.

> but I don't like the background colors much.

I agree. But I was to tired to work on them.
And the next morning I had to leave home for
some days.

> Also, real glass tends to exhibit variable reflection; in my own
> experiments I've found that type 0 with a falloff power of 2 or so
> provides a fairly realistic look (though it may not be mathematically accurate).

This is the T_glass3 from the glass.inc file that came with POV-Ray.
Unfortunately I do not have much experience with modelling of glass.

So at the moment I'm not capable of doing the changes that you
suggest above.

(Btw: About the falloff you mention:
- Is this about the light source - or the interior of the glass ?
- Or is it about something else ?)

> The highlights seem a little large in places.

I agree. But because of the long rendering times it will take me
a looong time to find a better lighting for this image. :(


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Tor Olav Kristensen wrote:
> 
> Xplo Eristotle wrote:
> 
> > Also, real glass tends to exhibit variable reflection; in my own
> > experiments I've found that type 0 with a falloff power of 2 or so
> > provides a fairly realistic look (though it may not be mathematically accurate).
> 
> This is the T_glass3 from the glass.inc file that came with POV-Ray.
> Unfortunately I do not have much experience with modelling of glass.
> 
> So at the moment I'm not capable of doing the changes that you
> suggest above.

You could always cannibalize the texture (copy/paste from the include
file) and make the necessary changes, it's not that hard.

> (Btw: About the falloff you mention:
> - Is this about the light source - or the interior of the glass ?
> - Or is it about something else ?)

The reflectivity. I was suggesting the use of angle-dependent reflection
(of course, if you don't have the MegaPatch, this won't help you, but
everyone SHOULD have it ^_- ).

> > The highlights seem a little large in places.
> 
> I agree. But because of the long rendering times it will take me
> a looong time to find a better lighting for this image. :(

So isolate one of the big highlights and do small test renders.

Um.. how slow IS your machine, anyway? You make it sound like you're
doing this on an old 486/66... ^^;

-- 
Xplo Eristotle
http://start.at/xplosion/

"And then one day you find ten years have got behind you
No one told you when to run, you missed the starting gun"
    -Pink Floyd

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Tor Olav Kristensen wrote:

> Maybe when I have learned more about colouring glass in POV-Ray.

This will give you red colored glass.

pigment { rgbf <1,0,0,.97> }

This will give you a turbulated reg, green, blue colored glass.

 pigment { gradient y turbulence .1
  color_map{ 
             [.33 rgb<1,0,0,1>]
             [.66 rgb<0,1,0,1>]
             [.99 rgb<0,0,1,1>]

           }
         }

Experiment and enjoy,

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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> > I find it a bit butterfly-like.
> Yes; now I see that it could be a butterfly viewed from above... strange...
But beautiful :) BTW, Bill DeWitt mentionned it probably was an orchid,
and if I remember well, orchids look a bit like animals, don't they?

> > Perhaps needs some colors, for a flower? Can we have a sample
> > ith more colors?
> >
> > Well, after all, maybe that's just me, so don't bother about that :)) 
> Maybe when I have learned more about colouring glass in POV-Ray.
OK. Waiting for this (and for you to have time to do it :))

> > May all your dreams but one become true.
> Hmmm ... which one of them ?        :)
The one which isn't the one you reaaaally want, because, if not, it
won't make you happy :))

Azrael
-- 
May all your dreams but one become true.

Azrael <azr### [at] chezcom>
http://www.chez.com/azrael

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Ken wrote:
> 
> This will give you red colored glass.
> 
> pigment { rgbf <1,0,0,.97> }
> 
> This will give you a turbulated reg, green, blue colored glass.
> 
>  pigment { gradient y turbulence .1
>   color_map{
>              [.33 rgb<1,0,0,1>]
>              [.66 rgb<0,1,0,1>]
>              [.99 rgb<0,0,1,1>]
> 
>            }
>          }

Will this only be applied to the surface of the 
glass object or will it also make changes to the 
interior of the glass object ?

I want to be able to make something similar to the 
nice coloured turbulence inside some glass marbles.


> Experiment and enjoy,

I will !

Thank you.


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Xplo Eristotle wrote:
> 
> The reflectivity. I was suggesting the use of angle-dependent reflection
> (of course, if you don't have the MegaPatch, this won't help you, but
> everyone SHOULD have it ^_- ).

Maybe I should, but at the moment my philosophy is that I 
should put my effort in learning about features in POV-Ray 
that I'm "guaranteed" to also find in the next generations 
of "standard" POV-Ray.

The disadvantages from this is that I cannot do all the 
fancy stuff done by the new patches I see in this news group.

But I think that since I'm relatively new to POV-Ray, there 
is plenty enough fancy stuff left for me to explore in v3.1.

My hope is that the most useful features you others 
"at the bleeding edge" find in the new patches will 
end up in "standard" POV.

:)


> > > The highlights seem a little large in places.
> >
> > I agree. But because of the long rendering times it will take me
> > a looong time to find a better lighting for this image. :(
> 
> So isolate one of the big highlights and do small test renders.

Yes, you're right. I'll do that if I find some spare time.


> Um.. how slow IS your machine, anyway? You make it sound like you're
> doing this on an old 486/66... ^^;

Heh Heh. It's not far from that. 

At the moment I have a 100 MHz Pentium PC at home. 


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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On Sat, 20 May 2000 00:59:02 +0200, Tor Olav Kristensen
<tor### [at] hotmailcom> wrote:

>Will this only be applied to the surface of the 
>glass object or will it also make changes to the 
>interior of the glass object ?

No.

>I want to be able to make something similar to the 
>nice coloured turbulence inside some glass marbles.

Go for media or another object inside your glass (the way marbles are
made, actually).


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

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