Richard Dault wrote:

> This is a little bit off topic, but not too much since raytracing is all
> about math.
>
> Anyone interested in mathematics and/or the golden ratio and/or pi should
> check out the film called "Pi".  See http://www.pithemovie.com for more info
> about it.

I would like to see this film, but unfortunately I haven't
seen any advertisements for it here in Norway.

But maybe I can order a DVD-copy of it.

Thank you for the tip.


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

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Tor Olav Kristensen wrote:
> 
[...]
> 
> Hmmm... I need to figure out how to make a
> sand texture.
> 

plane with some granite normal or ... isosurface ;-)

> > maybe scale the texture ...
> 
> Up or down ?
> 

down, but you can also leave it as it is.


Christoph

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

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In article <39B517ED.F7229D48@online.no>, Tor Olav Kristensen 
<tto### [at] onlineno> wrote:

> Or is it possible to read from an image file with
> standard POV ?

Not unless it is an ASCII format. However, you could position the blob 
component at the origin, rotate an image map so the portion of the image 
the blob will represent is also at the origin, and scale it up by a 
large amount, so the whole component is a single color. Doing this, you 
could make it *look* like each blob component has a solid color.
Using the eval_pigment() function would be much more elegant, though...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Chris Huff wrote:

> In article <39B517ED.F7229D48@online.no>, Tor Olav Kristensen
> <tto### [at] onlineno> wrote:
>
> > Or is it possible to read from an image file with
> > standard POV ?
>
> Not unless it is an ASCII format.

So I could read an uuencoded image then ? =)


> However, you could position the blob
> component at the origin, rotate an image map so the portion of the image
> the blob will represent is also at the origin, and scale it up by a
> large amount, so the whole component is a single color. Doing this, you
> could make it *look* like each blob component has a solid color.

Great idea !

I have now tried this with an array of spheres. => See attached image.
Is this a well known technique ?

Now I have to go and try to use this on my antiblobs,
as Xplo Eristotle suggested.


> Using the eval_pigment() function would be much more elegant, though...

Yes, but .... :)


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

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Attachments:
Download 'imagemosaic01.jpg' (76 KB)

Preview of image 'imagemosaic01.jpg'

Christoph Hormann wrote:

> Tor Olav Kristensen wrote:
> > Hmmm... I need to figure out how to make a
> > sand texture.
>
> plane with some granite normal or ... isosurface ;-)

NO!  It can't be THAT simple.   :-)

I was thinking too complicated then ...


> > > maybe scale the texture ...
> >
> > Up or down ?
> >
>
> down, but you can also leave it as it is.

Ok


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

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Tor Olav Kristensen wrote:

> ...
> I have now tried this with an array of spheres. => See attached image.
> ...

I used a part of the first image on this page:
http://www.wadhome.org/frazetta/overview0002.html

(Not really: Some years ago I scanned my Frazetta
poster-book with a monochrome scanner and added
pseudo colours to the image.)

If anyone is interested in the art of Frazetta, then here
are two links:

http://www.wadhome.org/frazetta/
http://www.frazettaartgallery.com/


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

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In article <39B561E7.BC0D7B11@online.no>, Tor Olav Kristensen 
<tto### [at] onlineno> wrote:

> So I could read an uuencoded image then ? =)

An interesting idea...anyone want to write a uu-decoder in POV-Script? 
:-)


> > component at the origin, rotate an image map so the portion of the image

Ouch, did I really write "rotate"? I meant "transform"...


> Is this a well known technique ?

If it is, I have not seen it...it was just something I thought of as I 
was writing that the eval_pattern() patch was the only way to do it. :-)

I highly doubt I was the first to come up with this idea, though, 
especially since there have been mosaiac images in the past using 
official POV.


> > Using the eval_pigment() function would be much more elegant, though...
> 
> Yes, but .... :)

But it requires a patched version of POV.
And if you want to do something to the objects themselves that depends 
on the color, or if you want to make them light sources or something, 
you do have to use eval_pigment().

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Chris Huff wrote:
> 
> And if you want to do something to the objects themselves that depends
> on the color, or if you want to make them light sources or something,
> you do have to use eval_pigment().

Ha! I can see it now: Fibonacci mosaic glows.

-Xplo

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Tor Olav Kristensen wrote:
> 
> Christoph Hormann wrote:
> 
> > Tor Olav Kristensen wrote:
> > > Hmmm... I need to figure out how to make a
> > > sand texture.
> >
> > plane with some granite normal or ... isosurface ;-)
> 
> NO!  It can't be THAT simple.   :-)
> 
> I was thinking too complicated then ...

Nonsense. Making 600,000 tiny isosurfaces and tracing them onto a
surface is a GOOD idea. :P

-Xplo

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In article <39B5728A.54AE8936@unforgettable.com>, 
inq### [at] unforgettablecom wrote:

> Ha! I can see it now: Fibonacci mosaic glows.

My version of the glow patch is based on MegaPOV, which has 
eval_pigment(), so I didn't mention that. Though it would be a problem 
with POV-AFX...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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