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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> 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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