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Steam columns! Brilliant idea! Thank you.
BTW the background moutains -are- cones :) I'll stick a heightfield in there
later when I'm happy with the foreground.
Thanks for all those comments, there's some good ideas in there. And
regarding the underwater bit, I really don't want to lose the cutaway, it's
what makes this image unusual, but you're right about caustics and render
times. We shall see...
--
Tek
http://evilsuperbrain.com
"Alain" <ele### [at] netscape net> wrote in message
news:43d6b13c@news.povray.org...
> Tek nous apporta ses lumieres en ce 24/01/2006 12:25:
>> Following my earlier post I've decided to go with the volcano image. This
>> is the latest version, but I'm suffering a case of povver's block! I can
>> see the volcano looks bad, but I don't know why. Any suggestions?
>>
>>
> Maybe some more snow near the top. Make the lava ejection narower, between
> 1/4 and 1/2 the diameter of the top and uncenterer. As it must be a
> volcano awakening, there can be snow up to the rim and inside of the
> crater, there should be a lot of steam. One or two steam column rising
> from somewhere on the slopes can add much interest.
> The background mountains are WAY to conical.
> I would expect the water to be mostly dark gray, it reflect mostly the
> dark ash cloud and should not be as blue as it is now. It's colour should
> comes from what over it and from some fade_color.
> Adding caustics can improve the aquatic effect. I don't think that using
> photons here is worth the effort nor the increased render time.
> If you are short on time, I propose that you drop the under water part, or
> only have it visible trough the surface, disturbed by the waves: remove
> the cutaway in the water.
>
> --
> Alain
> -------------------------------------------------
> Catholicism: If shit happens, you deserve it.
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Sweet! Yeah I'm going to add a river of lava in a while, though I think I'll
write a particle system in pov so it actually flows down the mountain. Nice
eruption effect, I'm going to have to add something like that :)
--
Tek
http://evilsuperbrain.com
"Rene Bui" <ren### [at] freefr> wrote in message
news:web.43d6b60189a10e0057a4b5680@news.povray.org...
> "Tek" <tek### [at] evilsuperbraincom> wrote:
>> the volcano looks bad, but I don't know why. Any suggestions?
>
> I'm not sure but maybe something like this (Photoshop cheating)
>
--------------------------------------------------------------------------------
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"Jon Buller" <jon### [at] bullersnet> wrote in message
news:web.43d6c8f889a10e00be920ef30@news.povray.org...
> That ash cloud doesn't seem right. As someone else said it's too
> symetrical, but I think worse is that it looks like it just hanging above
> not coming up from... It might just be a really large dark rain cloud the
> way it is...
Yup, well as you can see in the really early WIP I had this lovely complex
shape, then it looked terrible when I filled it with media so I wussed out
and now it's just a squashed sphere! I'm going to add more form too it.
> There I've done it again, that is the point I want to make, but much too
> harsh in it's presentation. It's not as bad as I make it out, and doesn't
> need a whole lot to be really great. Keep at it.
Seriously don't worry about it, in my opinion that wasn't too harsh, just
good constructive criticism.
> BTW, I like the lava better in your second image, but I think it needs
> some
> of the cloud mixed in with it.
I think you're referring to the photoshoped image someone else posted... :)
--
Tek
http://evilsuperbrain.com
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Tek wrote:
> Good point. I was basing the water colour on some documentary footage I saw,
> but of course that was filmed in hawaii. The lava I'm not so sure about,
> surely there's no reason you can't get lava in cold climates?
>
Of course you can get lava in cold climates:
http://images.google.fr/images?q=iceland+volcano&hl=fr&btnG=Recherche+d%27images
Jerome
- --
******************************
* Jerome M. Berger *
* mailto:jeb### [at] freefr *
* http://jeberger.free.fr/ *
******************************
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Version: GnuPG v1.4.2 (GNU/Linux)
iD8DBQFD18Nrd0kWM4JG3k8RAillAJ47o/qS8Il/FHdhMereU/eUm3T6iACeOhmZ
YGc6qgIF6gD5G9fWrwcKEfQ=
=koya
-----END PGP SIGNATURE-----
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Darren New wrote:
> Now, volcanos I think don't tend to be quite so vertical, nor quite so
> symetric.
Tough to generalize.
Some like these:
http://pubs.usgs.gov/dds/dds-40/images/JPG/small_screen/fig62.jpg
http://www.volcanodiscovery.com/volcano-tours/uploads/pics/semeru_53206_01.jpg
http://images.google.com/imgres?imgurl=http://pubs.usgs.gov/dds/dds-40/images/JPG/large_screen/fig95.jpg&imgrefurl=http://pubs.usgs.gov/dds/dds-40/album.html&h=696&w=1024&sz=212&tbnid=zxYNryPeanCIFM:&tbnh=101&tbnw=150&hl=en&start=10&prev=/images%3Fq%3Dsteep%2Bvolcano%26svnum%3D10%26hl%3Den%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN
http://pubs.usgs.gov/dds/dds-40/images/JPG/small_screen/fig70.jpg
http://www.uoguelph.ca/~sadura/igref/strato.jpg
http://i1.trekearth.com/photos/13124/11_026_23.jpg
are very symmetric.
And this one:
http://www.volcanos.ms/images/Guatemala/2003_04_14_Expedition_Fuego/fuego_exped-9d-rueckweg-nach-soledad-fuego-eruption.jpg
seems very steep.
> I also doubt you'd find snow on the slopes of an active volcano, as it's
> not unusual for the ground to be like 3000 degrees six inches down.
quite a few of those linked above have snow and appear active.
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Ron M wrote:
> quite a few of those linked above have snow and appear active.
Yeah. I guess it depends on whether the entire region is active, or
what. Plus, Yellowstone is quite active and still gets snow on the
ground, so I stand corrected. :-)
--
Darren New / San Diego, CA, USA (PST)
Crate & Barrel - Leading Supplier to
Video Game Worlds Since 1962!
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Ron M nous apporta ses lumieres en ce 26/01/2006 12:09:
> Darren New wrote:
>
>> Now, volcanos I think don't tend to be quite so vertical, nor quite so
>> symetric.
>
>
> Tough to generalize.
>
>
> Some like these:
> http://pubs.usgs.gov/dds/dds-40/images/JPG/small_screen/fig62.jpg
>
> http://www.volcanodiscovery.com/volcano-tours/uploads/pics/semeru_53206_01.jpg
>
>
>
http://images.google.com/imgres?imgurl=http://pubs.usgs.gov/dds/dds-40/images/JPG/large_screen/fig95.jpg&imgrefurl=http://pubs.usgs.gov/dds/dds-40/album.html&h=696&w=1024&sz=212&tbnid=zxYNryPeanCIFM:&tbnh=101&tbnw=150&hl=en&start=10&prev=/images%3Fq%3Dsteep%2Bvolcano%26svnum%3D10%26hl%3Den%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN
>
> http://pubs.usgs.gov/dds/dds-40/images/JPG/small_screen/fig70.jpg
> http://www.uoguelph.ca/~sadura/igref/strato.jpg
> http://i1.trekearth.com/photos/13124/11_026_23.jpg
> are very symmetric.
>
> And this one:
>
>
http://www.volcanos.ms/images/Guatemala/2003_04_14_Expedition_Fuego/fuego_exped-9d-rueckweg-nach-soledad-fuego-eruption.jpg
>
> seems very steep.
>
>
>> I also doubt you'd find snow on the slopes of an active volcano, as
>> it's not unusual for the ground to be like 3000 degrees six inches down.
>
>
> quite a few of those linked above have snow and appear active.
>
When tha lava is very fluid, like in Awaii, the volcano get broad: the lava can flows
fast and far
away before hardening.
When the lava is thick, the volcano gets steeper: it flows slowly and can't get far
before hardening.
That make Tek's volcano a thick lava variety. Those tend to send prety big lava blobs
on the air,
when they shoot lava in the air... They also are more prone to have explosive
eruptions.
--
Alain
-------------------------------------------------
When the bosses talk about improving productivity, they are never talking about
themselves.
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"Tek" <tek### [at] evilsuperbraincom> wrote:
>
> Well according to any number of discovery channel documentaries it's pretty
> common. Volcano erupts, suddenly melts lots of snow, huge flooding in
> surrounding areas. The specific eruption that inspired this image was Mt.
> St. Helens, though the initial eruption was mostly just a huge explosion of
> snow and rock, and lava might not have started spouting out of it until all
> the snow was gone.
In 1985, the Colombian volcano Nevado del Ruiz washed the town of Armero off
the map with a catastrophic snowmelt. A massive snowmelt is forecast to be
the method Mt. Rainier will use to waste Seatle-Tacoma.
I don't recall any lava in the Mt. St. Helens eruptions; only ash, steam,
and pyroclastics. I think the magma just blew itself into ash after the
north flank collapsed and releaved the pressure.
>
> This isn't meant to be a stable eruption, so I'm going to need to work on
> some more dramatic effects I think.
>
> "Darren New" <dne### [at] sanrrcom> wrote in message
> news:43d66ec3$1@news.povray.org...
> > The ground is both too black and too bare. Lava is very shiney, as the
> > surfaces were all liquid a short time ago and cooled under gravity. It's
> > mostly brittle and crunchy, like blown glass. Plus it's full of delicious
> > plant nutrients, so even days after an eruption, you get grass there,
> > saplings, etc.
>
> In hawaii this is true, and that's the only volcano I've been to. but my
> understanding is that volcanos that have lain dormant for a while actually
> end up covered mostly in very fertile dark soil and more mountain-like rock,
> and less smooth glassy rock... maybe... you know it's really beginning to
> sound like I need to do some research for this image! how tedious!
As Alain pointed out, the Hawai'ian volcanoes are fundamentally different
from the Cascades volcanoes such as Mt. St. Helens and Mt. Hood. Low
silica (fluid) lavas cool to dark basalts; high silica (viscous) lavas cool
to lighter-colored rocks.
But not only are the form and color of the mountains different, the
eruptions are majorly different, due to the consistencies of the lavas.
Fluid lavas tend to erupt into copious, but well-behaved lava flows. They
look like the best Hollywood-style killer infernos, with large, turbulent
pools of glowing red molten rock, giant pink gas-propelled fountains, and
rivers of lava hurtling towards the sea, everything you'd expect from
Dante's _Inferno_. Quite a sight! Alas, these eruptions are paper tigers;
they are so nonlethal that in Hawai'i they give tours while the volcano is
active!
Contrast that with Mt. St. Helens. There are two tourist roads leading to
the site, and neither of them so much as approaches the base of the
mountain. When a high-silica volcano such as Mt. St. Helens stirs, they
talk how many dozens of miles away they'll need to evacuate on 48 hours
notice. Then the eruption itself is ugly. Mud, flash flooding,
pyroclastic flows, hot ash all over the place, a lot of gritty smoke (the
cauliflower-like Plinian column), and nighttime at noon for hundreds of
miles around. Color? A drab rgb <0.1, 0.1, 0.1> or so. The picturesque
lava may not even show up! The visuals aren't something to pull in the
movie goers, but in real life, these are the real killer eruptions.
The blast damage is pretty cool, though.
> Hmm... I thought I'd get away without radiosity in this image, but I think
> if I have much lava I'll need it...
With the smoke column you have, i'd think it would almost be mandatory.
Perhaps only at night though. I've never seen an eruption up close,
although i've seen the volcano in Montserrat (Soufriere Hills) from a
distance, plus a lot of footage. (Not sure i'd like to witness an ash flow
up close, in any case.) Soufriere Hills is a composite volcano, with ashy,
explosive-type eruptions. From a distance, all i could see was varying
shades of gray: light gray, dark gray, cool gray, warm gray, all gray. :-P
pretty much as Pliny described it. In daytime footage, i could see some
red glows on the underside the lateral ash flows; perhaps sunlight
overwhelms the glow, the same way that a daytime sky overwhelms the stars.
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Oops!
I forgot to mention--artistic license still rules. :-)
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Tek wrote:
> Following my earlier post I've decided to go with the volcano image. This is
> the latest version, but I'm suffering a case of povver's block! I can see
> the volcano looks bad, but I don't know why. Any suggestions?
>
>
One thing is that you have a drop that's still hot in the water already,
but all followers are far away, over the halfway of the volcano itself
on the height. The lava river Rene suggested seems great, but still that
one single glowing piece in the water somehow disturbs me.
Also the water seems to be clear (while seeing the gloving drop so
clearly), but the.. umm, bottom(?) doesn't go with that - it seems like
a blue plane, not the bottom of a ocean nor lake.
Maybe the mountains in the background are too pyramid-shaped, too, they
seem to be exported from Egypt :p.
--
Eero "Aero" Ahonen
http://www.zbxt.net
aer### [at] removethiszbxtnetinvalid
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