I've still been playing with eval_pigment. I've made code that takes a
pigment and makes sort of a heightfield from it using cylinders and
spheres. The color at each vertex is blended with the next, achieving
color-interpolation.
The first image is the Van Gogh painting again, with diffuse 0 and
ambient 1 to show off the color-interpolation.
The second image is the Mona Lisa. She has 76,800 objects in her. Parse
took 54 seconds and the trace took 2 minutes, 37 seconds with AA. Peak
memory was 113158861 bytes.
I might post a macro to povray.text.scenes-files, although I think
something like this has been done before... I'm not sure.
Any questions or comments?

--
Samuel Benge

E-Mail: STB### [at] aolcom

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

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Attachments:
Download 'ipolate1.jpg' (155 KB) Download 'ipolate2.jpg' (94 KB)

Preview of image 'ipolate1.jpg'

Preview of image 'ipolate2.jpg'

SamuelT wrote:
> 
> I've still been playing with eval_pigment. I've made code that takes a
> pigment and makes sort of a heightfield from it using cylinders and
> spheres. The color at each vertex is blended with the next, achieving
> color-interpolation.

That sounds like a good idea, at least for noisy, low resolution images

> The first image is the Van Gogh painting again, with diffuse 0 and
> ambient 1 to show off the color-interpolation.
> The second image is the Mona Lisa. She has 76,800 objects in her. Parse
> took 54 seconds and the trace took 2 minutes, 37 seconds with AA. Peak
> memory was 113158861 bytes.

I like the your Mona Lisa, the face looks a bit messy.  perhaps it would
help making it even more detailed :)  

I thought about the comparison with heightfield you mentioned and had
the idea, that hexagonal basalt-structures you can see in vulcanic
regions could easily be modelled using this technique, maybe I will try
that sometime... 

> I might post a macro to povray.text.scenes-files, although I think
> something like this has been done before... I'm not sure.

Making a macro sounds like a good idea, I am looking foreward to see it.


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

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Christoph Hormann wrote:

> I like the your Mona Lisa, the face looks a bit messy.  perhaps it would
> help making it even more detailed :)

Part of the reason Mona looks so bad is that all the dark parts force the
cylinders downward, which includes the shadows on her face.


> I thought about the comparison with heightfield you mentioned and had
> the idea, that hexagonal basalt-structures you can see in vulcanic
> regions could easily be modelled using this technique, maybe I will try
> that sometime...

I don't know how to go about doing that, at least if the columns are going to
be perfect hexagons. I could think of how to do one that has slightly
squished hexagonal columns...


> > I might post a macro to povray.text.scenes-files, although I think
> > something like this has been done before... I'm not sure.
>
> Making a macro sounds like a good idea, I am looking foreward to see it.

It will have a problem I don't want to fix: the problem being that two sides
of the grid will have cylinders hanging out, while the other two won't.
Fixing it would mean increasing parsing time.

--
Samuel Benge

E-Mail: STB### [at] aolcom

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

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Never mind that last thing I said. I forgot all about the ever-useful #if
statement! Call it fixed.

SamuelT wrote:

> It will have a problem I don't want to fix: the problem being that two sides
> of the grid will have cylinders hanging out, while the other two won't.
> Fixing it would mean increasing parsing time.
>
> --
> Samuel Benge
>
> E-Mail: STB### [at] aolcom
>
> Visit my isosurface tutorial at http://members.aol.com/stbenge

--
Samuel Benge

E-Mail: STB### [at] aolcom

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

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SamuelT wrote:
>
> > I thought about the comparison with heightfield you mentioned and had
> > the idea, that hexagonal basalt-structures you can see in vulcanic
> > regions could easily be modelled using this technique, maybe I will try
> > that sometime...
> 
> I don't know how to go about doing that, at least if the columns are going to
> be perfect hexagons. I could think of how to do one that has slightly
> squished hexagonal columns...
> 

I found two links for better understanding:

http://cyberfair.gsn.org/Nespelem/Basalt_Columns_.html
http://home.t-online.de/home/realschule.linz.rhein/basalt.jpg

IIRC the columns are about 20cm diameter and quite irregular, no single
crystals, but that does not seem important to me because I like to place
them as objects like the cylinders.

Christoph

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

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chr### [at] gmxde (Christoph Hormann) wrote in
<3941F368.E9FFD86D@gmx.de>: 

>I found two links for better understanding:
>
>http://cyberfair.gsn.org/Nespelem/Basalt_Columns_.html
>http://home.t-online.de/home/realschule.linz.rhein/basalt.jpg

Also take a look at 
http://www.interknowledge.com/northern-ireland/ukiant01.htm
and the many other web sites with pictures of Giant's Causeway in Northern 
Ireland.  These columns are several feet across.

-- 
Rich Allen
(Remove SPAM from my address to reply by e-mail)

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Yep, this is definitely a signal from an intelligent life form...
(Still thinking about those SETI graphs)

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

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That macro is pretty amazing .. take any picture and make it into a
latch-hook
template =)
Seriously, what a cool idea.  Try some other famous works.  I wonder how a
pointillist painting shows up on this.

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