I again started making some experiments with isosurfaces and radiosity,
now with a new faster computer that's much more fun than before, but still
quite slow.  

The isosurface function is fairly simple, a 'blob' from a plane and a
sphere with an agate pigment function added.  

The radiosity quality settings are quite high, probably could reduce count
to some extend without visible artefacts.  The scene took 52 hours to
render at this size, statistics showed an incredible amount of 105 billion
DNoise calls, again a sign that current isosurface code is far from being
efficient with slow isosurface functions.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Attachments:
Download 'rad_iso_01.jpg' (86 KB)

Preview of image 'rad_iso_01.jpg'

Aww come on, no fair, your not supposed to post photos in here!:-)
"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3B4B6914.A2A00614@gmx.de...
>
> I again started making some experiments with isosurfaces and radiosity,
> now with a new faster computer that's much more fun than before, but still
> quite slow.
>
> The isosurface function is fairly simple, a 'blob' from a plane and a
> sphere with an agate pigment function added.
>
> The radiosity quality settings are quite high, probably could reduce count
> to some extend without visible artefacts.  The scene took 52 hours to
> render at this size, statistics showed an incredible amount of 105 billion
> DNoise calls, again a sign that current isosurface code is far from being
> efficient with slow isosurface functions.
>
> Christoph
>
> --
> Christoph Hormann <chr### [at] gmxde>
> IsoWood include, radiosity tutorial, TransSkin and other
> things on: http://www.schunter.etc.tu-bs.de/~chris/


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

Post a reply to this message

That's very realistic!  Looks like some sort of mineral deposit from a
hot spring.

-- 
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

Post a reply to this message

Amazing results.. All 52 hours counted on this image!

Post a reply to this message

Very very impressive. It's amazing how good a "simple" isosurface can look :)

Can you post the source please? I'd love to have a look at the isosurface and
radiosity settings.

--
Tek
http://www.evilsuperbrain.com


Christoph Hormann <chr### [at] gmxde> wrote in message
news:3B4B6914.A2A00614@gmx.de...
>
> I again started making some experiments with isosurfaces and radiosity,
> now with a new faster computer that's much more fun than before, but still
> quite slow.
>
> The isosurface function is fairly simple, a 'blob' from a plane and a
> sphere with an agate pigment function added.
>
> The radiosity quality settings are quite high, probably could reduce count
> to some extend without visible artefacts.  The scene took 52 hours to
> render at this size, statistics showed an incredible amount of 105 billion
> DNoise calls, again a sign that current isosurface code is far from being
> efficient with slow isosurface functions.
>
> Christoph
>
> --
> Christoph Hormann <chr### [at] gmxde>
> IsoWood include, radiosity tutorial, TransSkin and other
> things on: http://www.schunter.etc.tu-bs.de/~chris/


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

Post a reply to this message

Yike!

source now dammit !!

--
Rick

Kitty5 WebDesign - http://Kitty5.com
Hi-Impact database driven web site design & e-commerce
TEL : +44 (01625) 266358 - FAX : +44 (01625) 611913 - ICQ : 15776037
POV-Ray News & Resources - http://Povray.co.uk

PGP Public Key
http://pgpkeys.mit.edu:11371/pks/lookup?op=get&search=0x231E1CEA

Post a reply to this message

David Fontaine wrote:
> 
> That's very realistic!

Agreed.

> Looks like some sort of mineral deposit from a hot spring.

Except mineral deposits don't hover in mid-air!



-- 
Francois Labreque | Unfortunately, there's no such thing as a snooze
    flabreque     | button on a cat who wants breakfast.
        @         |      - Unattributed quote from rec.humor.funny
   videotron.ca

Post a reply to this message

Attachments:
Download 'rad_iso_02.jpg' (49 KB)

Preview of image 'rad_iso_02.jpg'

No less than incredible. A *real* beautiful render.

Bob H.

Post a reply to this message

"Francois Labreque" <fla### [at] videotronca> wrote in message
news:3B4B9ECB.2C0D7F43@videotron.ca...
>
> Except mineral deposits don't hover in mid-air!


Who threw that rock?

Excellent btw.

Post a reply to this message

David Fontaine wrote:
> 
> That's very realistic!  

Thanks!

> Looks like some sort of mineral deposit from a
> hot spring.
> 

Maybe, but there isn't any water around...

For rocks, it's much too smooth, probably. Will have to work on that...

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Thomas Lake wrote:
> 
> Aww come on, no fair, your not supposed to post photos in here!:-)

It's really fairly simple, lighting worked quite well, but the geometry is
far from being realistic.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Francois Labreque wrote:
> 
> > Looks like some sort of mineral deposit from a hot spring.
> 
> Except mineral deposits don't hover in mid-air!
> 

:-)

That's a general problem with isosurfaces, you often can't prevent parts
to separate from the surface.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Tom Melly wrote:
> 
> Who threw that rock?

That was me (or Mr. noise generator if you want so)

> 
> Excellent btw.

Thank you.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Sean Johnson wrote:
> 
> Amazing results.. All 52 hours counted on this image!

Thanks, but 52 hours for a simple test scene are really quite a lot IMO.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Tek wrote:
> 
> Very very impressive. It's amazing how good a "simple" isosurface can look :)
> 

Thanks!

It is really quite simple, the agate pattern often leads to interesting
results with isosurfaces, although it's of course quite slow.  

> Can you post the source please? I'd love to have a look at the isosurface and
> radiosity settings.

Is in p.t.s-f.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

"Rick [Kitty5]" wrote:
> 
> Yike!

Thank you.

> 
> source now dammit !!
> 

Don't tell me you want to start coding isosurfaces... ;-)

See in p.t.s-f. anyway.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

"Bob H." wrote:
> 
> No less than incredible. A *real* beautiful render.
> 

Thanks Bob, glad you like it.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

In article <3B4B6914.A2A00614@gmx.de>, Christoph Hormann says...
> 
> I again started making some experiments with isosurfaces and radiosity,
> now with a new faster computer that's much more fun than before, but still
> quite slow.  
> 
> The isosurface function is fairly simple, a 'blob' from a plane and a
> sphere with an agate pigment function added.  
> 
> The radiosity quality settings are quite high, probably could reduce count
> to some extend without visible artefacts.  The scene took 52 hours to
> render at this size, statistics showed an incredible amount of 105 billion
> DNoise calls, again a sign that current isosurface code is far from being
> efficient with slow isosurface functions.
> 
> Christoph
> 
Return to Mars! Great!!
-- 
Regards,  Sander

Post a reply to this message

Sander wrote:
> 
> >
> Return to Mars! Great!!

Not really sure if mars would look like that, but thank anyway.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Christoph Hormann wrote:
> 
> That's a general problem with isosurfaces, you often can't prevent parts
> to separate from the surface.

Yeah.  It's easy enough with just a plane, but with a blob i don't know
how you'd do it.  POV needs surface displacement!  :)

-- 
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

Post a reply to this message

David Fontaine wrote:
> 
> Yeah.  It's easy enough with just a plane, but with a blob i don't know
> how you'd do it.  POV needs surface displacement!  :)
> 

Surface displacement only works in normal direction of the surface,
therefore it would not help much here.  Anyway surface displaced meshes
would be an interesting thing.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

"David Fontaine" <dav### [at] faricynet> wrote in message
news:3B4E073A.9EAB3BF4@faricy.net...
>
> Yeah.  It's easy enough with just a plane

How so?

Post a reply to this message

"Tom Melly" <tom### [at] tomandlucouk> wrote in message
news:3b4eae0d@news.povray.org...
> "David Fontaine" <dav### [at] faricynet> wrote in message
> news:3B4E073A.9EAB3BF4@faricy.net...
> >
> > Yeah.  It's easy enough with just a plane
>
> How so?
>

function {y - F_Func(x,0,z) }

Gail
*************************************************************************
* gsh### [at] monotixcoza                *   Step into the abyss,           *
* http://www.rucus.ru.ac.za/~gail/   *   and let go.          Babylon 5 *
*************************************************************************
* The difficult we do immediately, the impossible takes a little longer *
*************************************************************************

Post a reply to this message

"Gail Shaw" <gsh### [at] monotixcoza> wrote in message
news:3b4eaea5@news.povray.org...
>
> > > Yeah.  It's easy enough with just a plane
> >
> > How so?
> >
>
> function {y - F_Func(x,0,z) }
>

Silly me - I've taken another look at my iso-plane (which I "remembered" was
separating). It doesn't, but some of the protuberences are very unnatural*
unless I really scale the function down. BTW I've just posted the scene in
question.

*for an object under gravity

Post a reply to this message