POV-Ray : Newsgroups : povray.binaries.images : Set of old renders 5/10 - Water cup Server Time
29 Mar 2024 08:28:46 EDT (-0400)
  Set of old renders 5/10 - Water cup (Message 1 to 9 of 9)  
From: HENON fabien
Subject: Set of old renders 5/10 - Water cup
Date: 22 Jan 2018 17:45:01
Message: <web.5a6668b54e1984a03e9f57b0@news.povray.org>
Height field is used to mimick the waves


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From: Kenneth
Subject: Re: Set of old renders 5/10 - Water cup
Date: 24 Jan 2018 03:15:00
Message: <web.5a683f82c399a6d1a47873e10@news.povray.org>
A clever use of a height_field.

I like this; the 'embossed' shapes on the cup look to be actual geometry, not
just some fancy normals(?).

I wonder how this would look with POV-Ray's newer subsurface scattering effect
added?


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From: Alain
Subject: Re: Set of old renders 5/10 - Water cup
Date: 24 Jan 2018 17:19:59
Message: <5a69068f@news.povray.org>

> A clever use of a height_field.
> 
> I like this; the 'embossed' shapes on the cup look to be actual geometry, not
> just some fancy normals(?).
> 
> I wonder how this would look with POV-Ray's newer subsurface scattering effect
> added?
> 
> 

Those are normal perturbations. Look at the gold stripe going across the 
flowers. It's flat. Also, the shape don't show any indentation on the edge.


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From: Kenneth
Subject: Re: Set of old renders 5/10 - Water cup
Date: 24 Jan 2018 18:50:01
Message: <web.5a691b30c399a6d1a47873e10@news.povray.org>
Alain <kua### [at] videotronca> wrote:

>
> Those are normal perturbations. Look at the gold stripe going across the
> flowers. It's flat. Also, the shape don't show any indentation on the edge.

As I look more closely at it, I think you're correct. It does appear to be a
'better-than-normals' appearance though... perhaps because of the slight dark
outlines around the flowery artwork. An optical illusion -- and an interesting
one to make note of for the future ;-)


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From: Bald Eagle
Subject: Re: Set of old renders 5/10 - Water cup
Date: 24 Jan 2018 21:10:00
Message: <web.5a693c52c399a6d15cafe28e0@news.povray.org>
"Kenneth" <kdw### [at] gmailcom> wrote:

> I like this; the 'embossed' shapes on the cup look to be actual geometry, not
> just some fancy normals(?).

It does appear that way, doesn't it?  I was wondering how he achieved such a
beautiful effect, and you prompted me to unzip the source files he provided and
look.
It's just a bump map.
Alain pointed out the gold stripe, but that I suppose could be due to almost
anything, depending upon how the cup is "built".

> I wonder how this would look with POV-Ray's newer subsurface scattering effect
> added?

Yes, that would be something to see, wouldn't it?
Perhaps add a thin layer of clear glaze with some crazing as well - perhaps do
an old/new comparison...

Really beautiful work.  This and the watch are my favorites.  Maybe I'll get the
time to peek at the source of that as well.  :)


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From: HENON fabien
Subject: Re: Set of old renders 5/10 - Water cup
Date: 25 Jan 2018 16:20:00
Message: <web.5a6a4942c399a6d13e9f57b0@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Kenneth" <kdw### [at] gmailcom> wrote:
>
> > I like this; the 'embossed' shapes on the cup look to be actual geometry, not
> > just some fancy normals(?).
>
> It does appear that way, doesn't it?  I was wondering how he achieved such a
> beautiful effect, and you prompted me to unzip the source files he provided and
> look.
> It's just a bump map.
> Alain pointed out the gold stripe, but that I suppose could be due to almost
> anything, depending upon how the cup is "built".
>
> > I wonder how this would look with POV-Ray's newer subsurface scattering effect
> > added?
>
> Yes, that would be something to see, wouldn't it?
> Perhaps add a thin layer of clear glaze with some crazing as well - perhaps do
> an old/new comparison...
>
> Really beautiful work.  This and the watch are my favorites.  Maybe I'll get the
> time to peek at the source of that as well.  :)

Hi,
Thanks for your comments.
Yes it's just a bump map.
If you remove the area_light from the scene, it gets ugply : the bump effect
disappears
Povray 3.7 does not render POV 3.0 well.

I rendered the scene again but with povwin 3.0 (as orginially) and this time
the gold line  is now gone, and the bumps are reversed


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From: HENON fabien
Subject: Re: Set of old renders 5/10 - Water cup
Date: 27 Jan 2018 04:50:01
Message: <web.5a6c4a81c399a6d13e9f57b0@news.povray.org>
"HENON fabien" <fab### [at] caramailcom> wrote:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> > "Kenneth" <kdw### [at] gmailcom> wrote:
> >
> > > I like this; the 'embossed' shapes on the cup look to be actual geometry, not
> > > just some fancy normals(?).
> >
> > It does appear that way, doesn't it?  I was wondering how he achieved such a
> > beautiful effect, and you prompted me to unzip the source files he provided and
> > look.
> > It's just a bump map.
> > Alain pointed out the gold stripe, but that I suppose could be due to almost
> > anything, depending upon how the cup is "built".
> >
> > > I wonder how this would look with POV-Ray's newer subsurface scattering effect
> > > added?
> >
> > Yes, that would be something to see, wouldn't it?
> > Perhaps add a thin layer of clear glaze with some crazing as well - perhaps do
> > an old/new comparison...
> >
> > Really beautiful work.  This and the watch are my favorites.  Maybe I'll get the
> > time to peek at the source of that as well.  :)
>
> Hi,
> Thanks for your comments.
> Yes it's just a bump map.
> If you remove the area_light from the scene, it gets ugply : the bump effect
> disappears
> Povray 3.7 does not render POV 3.0 well.
>
> I rendered the scene again but with povwin 3.0 (as orginially) and this time
> the gold line  is now gone, and the bumps are reversed
With the render, that's better..


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From: HENON fabien
Subject: Re: Set of old renders 5/10 - Water cup
Date: 28 Jan 2018 15:20:01
Message: <web.5a6e2f63c399a6d13e9f57b0@news.povray.org>
"HENON fabien" <fab### [at] caramailcom> wrote:
> "HENON fabien" <fab### [at] caramailcom> wrote:
> > "Bald Eagle" <cre### [at] netscapenet> wrote:
> > > "Kenneth" <kdw### [at] gmailcom> wrote:
> > >
> > > > I like this; the 'embossed' shapes on the cup look to be actual geometry, not
> > > > just some fancy normals(?).
> > >
> > > It does appear that way, doesn't it?  I was wondering how he achieved such a
> > > beautiful effect, and you prompted me to unzip the source files he provided and
> > > look.
> > > It's just a bump map.
> > > Alain pointed out the gold stripe, but that I suppose could be due to almost
> > > anything, depending upon how the cup is "built".
> > >
> > > > I wonder how this would look with POV-Ray's newer subsurface scattering effect
> > > > added?
> > >
> > > Yes, that would be something to see, wouldn't it?
> > > Perhaps add a thin layer of clear glaze with some crazing as well - perhaps do
> > > an old/new comparison...
> > >
> > > Really beautiful work.  This and the watch are my favorites.  Maybe I'll get the
> > > time to peek at the source of that as well.  :)
> >
> > Hi,
> > Thanks for your comments.
> > Yes it's just a bump map.
> > If you remove the area_light from the scene, it gets ugply : the bump effect
> > disappears
> > Povray 3.7 does not render POV 3.0 well.
> >
> > I rendered the scene again but with povwin 3.0 (as orginially) and this time
> > the gold line  is now gone, and the bumps are reversed
> With the render, that's better..
I just wonder why the golden line appear once at the top in povray 3.0 (as it
should) and twice on povray 3.7.

To me it's a bug. I included the code in the middle.
Has the texture gradient handling changed ?


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From: Alain
Subject: Re: Set of old renders 5/10 - Water cup
Date: 28 Jan 2018 18:07:05
Message: <5a6e5799$1@news.povray.org>

> "HENON fabien" <fab### [at] caramailcom> wrote:
>> "HENON fabien" <fab### [at] caramailcom> wrote:
>>> "Bald Eagle" <cre### [at] netscapenet> wrote:
>>>> "Kenneth" <kdw### [at] gmailcom> wrote:
>>>>
>>>>> I like this; the 'embossed' shapes on the cup look to be actual geometry, not
>>>>> just some fancy normals(?).
>>>>
>>>> It does appear that way, doesn't it?  I was wondering how he achieved such a
>>>> beautiful effect, and you prompted me to unzip the source files he provided and
>>>> look.
>>>> It's just a bump map.
>>>> Alain pointed out the gold stripe, but that I suppose could be due to almost
>>>> anything, depending upon how the cup is "built".
>>>>
>>>>> I wonder how this would look with POV-Ray's newer subsurface scattering effect
>>>>> added?
>>>>
>>>> Yes, that would be something to see, wouldn't it?
>>>> Perhaps add a thin layer of clear glaze with some crazing as well - perhaps do
>>>> an old/new comparison...
>>>>
>>>> Really beautiful work.  This and the watch are my favorites.  Maybe I'll get the
>>>> time to peek at the source of that as well.  :)
>>>
>>> Hi,
>>> Thanks for your comments.
>>> Yes it's just a bump map.
>>> If you remove the area_light from the scene, it gets ugply : the bump effect
>>> disappears
>>> Povray 3.7 does not render POV 3.0 well.
>>>
>>> I rendered the scene again but with povwin 3.0 (as orginially) and this time
>>> the gold line  is now gone, and the bumps are reversed
>> With the render, that's better..
> I just wonder why the golden line appear once at the top in povray 3.0 (as it
> should) and twice on povray 3.7.
> 
> To me it's a bug. I included the code in the middle.
> Has the texture gradient handling changed ?
> 

Prior to version 3.5, the gradient pattern was reversed in the negative 
region. Now, it's direction stay the same everywhere.

It incorrectly was:
  ----++++
  \ \  / /
   \ \/ /

It's now as it should always have been:
----++++
  / / / /
/ / / /

This can introduce some glitches with some older scenes that made use of 
the inverted grade.
You can add "triangle_wave" to get alternated up and down slopes with a 
period of 2. In your case, that would be a viable solution.


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