Here are a couple of images to illustrate the response I posted on 
povray.general to a question on using object patterns as isosurfaces.
It's just a set of merged tubes with turbulence added to try to emulate the 
style of the underground caverns from the laser scanned fly-through that was 
posted in the animations newsgroup a few weeks back. The camera is looking 
down the inside of one turbulent tube with various branches off it.

The smaller image took about half an hour to render with a max_gradient 
setting of 200.
The other uses a max_gradient of 2000, but is only a partial render because 
I gave up after 20 hours.

Regards,
Chris B.

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Attachments:
Download 'cavern.jpg' (95 KB) Download 'cavernsmall.jpg' (38 KB)

Preview of image 'cavern.jpg'

Preview of image 'cavernsmall.jpg'

Nice ..and if you look closer to the floor ..

this looks like a closer view on a wave (ocean wave closer look) ..
and i think if you change the grey color for a blue color , you will get a
perfect water cavern ..

I think you should extend your texture to water ...cause it s close to
perfection ...














news:449147b3@news.povray.org...
> Here are a couple of images to illustrate the response I posted on
> povray.general to a question on using object patterns as isosurfaces.
> It's just a set of merged tubes with turbulence added to try to emulate
the
> style of the underground caverns from the laser scanned fly-through that
was
> posted in the animations newsgroup a few weeks back. The camera is looking
> down the inside of one turbulent tube with various branches off it.
>
> The smaller image took about half an hour to render with a max_gradient
> setting of 200.
> The other uses a max_gradient of 2000, but is only a partial render
because
> I gave up after 20 hours.
>
> Regards,
> Chris B.
>
>
>
>
>
>
>

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> I gave up after 20 hours.

Some month ago I tried this technique with a text object
but the render was very slow. As in your cave scene there 
were a lot gaps and after increasing the maximum gradient 
I had to wait several minutes for just one line so I decided 
to stop the experiment...

Your cave animation was a pleasure!

Good luck,
Sebastian

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"Sebastian" <van### [at] gmxde> wrote in message 
news:pan### [at] gmxde...
>
>> I gave up after 20 hours.
>
> Some month ago I tried this technique with a text object
> but the render was very slow. As in your cave scene there
> were a lot gaps and after increasing the maximum gradient
> I had to wait several minutes for just one line so I decided
> to stop the experiment...
>
> Your cave animation was a pleasure!
>
> Good luck,
> Sebastian
>

I can't lay claim to the cave animation, that was Tom Austin.
These images were inspired by his animation and were just my attempt to 
emulate the sort of style of the laser scanned caves from his animation.

Regards,
Chris B.

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"NEWS" <pen### [at] caramailfr> wrote in message 
news:4492822d@news.povray.org...
> Nice ..and if you look closer to the floor ..
>
> this looks like a closer view on a wave (ocean wave closer look) ..
> and i think if you change the grey color for a blue color , you will get a
> perfect water cavern ..
>
> I think you should extend your texture to water ...cause it s close to
> perfection ...
>
>

Nice thought, so here's one with a blue/green layer, though the water I've 
seen in caves has tended to look pitch black.
Plus one of the same object rendered directly rather than through an 
Isosurface pattern.
The isosurface version took 1h 18min to render versus 4 second for the plain 
one.

Regards,
Chris B.

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Attachments:
Download 'cavern simple with water.jpg' (9 KB) Download 'cavern with water.jpg' (36 KB)

Preview of image 'cavern simple with water.jpg'

Preview of image 'cavern with water.jpg'

> 
> I can't lay claim to the cave animation, that was Tom Austin.

Ah, ok, I just remembered the vid.

Sebastian

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Chris B nous apporta ses lumieres en ce 16/06/2006 11:51:
> "NEWS" <pen### [at] caramailfr> wrote in message 
> news:4492822d@news.povray.org...
>> Nice ..and if you look closer to the floor ..
>>
>> this looks like a closer view on a wave (ocean wave closer look) ..
>> and i think if you change the grey color for a blue color , you will get a
>> perfect water cavern ..
>>
>> I think you should extend your texture to water ...cause it s close to
>> perfection ...
>>
>>
> 
> Nice thought, so here's one with a blue/green layer, though the water I've 
> seen in caves has tended to look pitch black.
> Plus one of the same object rendered directly rather than through an 
> Isosurface pattern.
> The isosurface version took 1h 18min to render versus 4 second for the plain 
> one.
> 
> Regards,
> Chris B.
> 
> 
> 
If the water looks black in a cavern, it's often due to dark surrounding and botton.
In fact, 
underground water tend to be crystal clear and prety still: no waves nor ripples.
That's acording to 
every photo I ever saw and my one spellunking experience. So, it's rgbt 1 fade_color
and relatively 
long fade_distance, have ior of 4/3, variable fresnel reflection, some tight specular.

-- 
Alain
-------------------------------------------------
Light travels faster than sound. That is why some people appear bright until you hear
them speak.

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Chris B wrote:
> "Sebastian" <van### [at] gmxde> wrote in message 
> news:pan### [at] gmxde...
>>> I gave up after 20 hours.
>> Some month ago I tried this technique with a text object
>> but the render was very slow. As in your cave scene there
>> were a lot gaps and after increasing the maximum gradient
>> I had to wait several minutes for just one line so I decided
>> to stop the experiment...
>>
>> Your cave animation was a pleasure!
>>
>> Good luck,
>> Sebastian
>>
> 
> I can't lay claim to the cave animation, that was Tom Austin.
> These images were inspired by his animation and were just my attempt to 
> emulate the sort of style of the laser scanned caves from his animation.
> 

Thanks.
I'm glad that my very technical work may actually inspire some artistic 
work ;-)


Tom

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