Hi folks :)
My idea for current stills round is a  deeply rusted Tanker which sank out
Brittany (France) shores 3 years ago and fouled the coasts on400km.
I have to work further on sea surface texture and ship accessories and
textures
but here I am so far:
http://povwip.tuxfamily.org/img/erika5.jpg20030917044555.jpg
Comments advices and critics are welcome :-)

Marc

Post a reply to this message

Hi,

It's the first time I've seen someone trying to imitate foam with POV-Ray.
The result is fairly convincing, except where the ship intersects with the
water. A reference photo would be nice, but my guess is that the heightfield
is too smooth, and the foam is not transparant at all (should it be?) so the
ship doesn't look like it's IN the water.

Why and where foam exists in the real-life ocean, I'm not sure. Probably on
the edge of high waves? The foam in your picture seems to be randomly
located, except around the ship (I suspect you used a bitmap for this). But
this isn't too much of a problem I think.. Perhaps it would look better when
rendered with a bit of focal_blur, especially to smooth out the horizon.

Generally, as I said before, I really like the water surface and material.

Regards,
Hugo

Post a reply to this message

It looks very impressive at this stage. I'm just going to list the things
that I think could be improved:

More sub-pixel scale detail on the tanker (bump maps perhaps, as well as
geometry) would be good, as you say, to really make it look realistic. The
rust texture is good - if you were being really pedantic, rust image-maps
around particular features (to simulate rusting around rivets, joins etc.)
would look very good.

The lighting seems quite bright too - if I were doing this image, I would
probably try lighting with radiosity and a grey sky sphere, to simulate
overcast clouds, with only a dim 'sun' light source. Its difficult to tell -
your water looks very well lit, the boat and foam less so (imho).

On the foam topic:
http://www.uneptie.org/pc/apell/graphics/disasters/erika.jpg shows foam
underwater (the green) as well as on the surface - this might be achievable
using media?

Very good image so far.

-Chris

Post a reply to this message

3f69892f@news.povray.org...
> Hi,
>
> It's the first time I've seen someone trying to imitate foam with POV-Ray.
> The result is fairly convincing, except where the ship intersects with the
> water. A reference photo would be nice, but my guess is that the
heightfield
> is too smooth, and the foam is not transparant at all (should it be?) so
the
> ship doesn't look like it's IN the water.
I totally agree IRL, water interacts with the ship, waves hit the hull and
get higher, make spray, foam. , the stem generates a bow wave.
I am far from reality.
Water is an isosurface, here.
I'd like to make foam with a media but I've not found how.
>
> Why and where foam exists in the real-life ocean, I'm not sure.
>Probably on the edge of high waves?

I observed that  some sharp waves ridges fall over and bubbles make foam
that stays at the same place while wave keeps on its way so we can see foam
a the back of the waves.

>The foam in your picture seems to be randomly
> located,
True, I do not know  yet how to do better
.
 >except around the ship (I suspect you used a bitmap for this).

True too :-)

>But this isn't too much of a problem I think.. Perhaps it would look better
when
> rendered with a bit of focal_blur, especially to smooth out the horizon.
>
With a lower camera you'd only see foam on high waves :)

> Generally, as I said before, I really like the water surface and material.
>
> Regards,
> Hugo
>
>
Thank you for your comments, I keep your advices in mind

Regards

Marc

Post a reply to this message

3f69afce@news.povray.org...
> It looks very impressive at this stage. I'm just going to list the things
> that I think could be improved:

Thanks, that's what I expect
>
> More sub-pixel scale detail on the tanker (bump maps perhaps, as well as
> geometry) would be good, as you say, to really make it look realistic.

 Scheduled :-)

> The rust texture is good - if you were being really pedantic, rust
image-maps
> around particular features (to simulate rusting around rivets, joins etc.)
> would look very good.

Excellent idea!
>
> The lighting seems quite bright too - if I were doing this image, I would
> probably try lighting with radiosity and a grey sky sphere, to simulate
> overcast clouds, with only a dim 'sun' light source. Its difficult to
tell -
> your water looks very well lit, the boat and foam less so (imho).
>
I'm not at all satisfied with foam, it's a pigment and real foam looks more
like a media
> On the foam topic:
> http://www.uneptie.org/pc/apell/graphics/disasters/erika.jpg shows foam
> underwater (the green) as well as on the surface - this might be
achievable
> using media?

 I think if I represent the wreckage, i'll make something similar using
media of course
http://www.ac-reunion.fr/pedagogie/lyvergerp/svt/TPE/pollutionhydrocarbure/i
mages/imagelif.jpeg
>
> Very good image so far.

Thanks a lot

Marc

Post a reply to this message