Hello folks. Had an isosurface attack earlier and this is the product. 
Sorry about the file size, but I had to reduce some jpeg artifacts.

The base shape (an octahedron) was warped with multiple passes of x, y 
and z cos functions using a #while loop. Each cos function is scaled 
twice as large as the next (both in size and strength). The variable 
responsible for this begins with a value of 1 and counts by itself till 
it reaches 128 like this:
#declare V=V+V;

It rendered relatively fast so I added one 2x2 area_light to help the 
initial point light.

Questions, comments, ideas?

-Samuel Benge

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Attachments:
Download 'erosion.jpg' (128 KB)

Preview of image 'erosion.jpg'

Samuel Benge wrote:
> Hello folks. Had an isosurface attack earlier and this is the product. 
> Sorry about the file size, but I had to reduce some jpeg artifacts.
> 
> The base shape (an octahedron) was warped with multiple passes of x, y 
> and z cos functions using a #while loop. Each cos function is scaled 
> twice as large as the next (in size and strength).
> [...]

Neat, you are not the first one trying the though ;-) See:

http://news.povray.org/3c7bb095@news.povray.org

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 21 Mar. 2004 _____./\/^>_*_<^\/\.______

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Christoph Hormann wrote:

> Neat, you are not the first one trying the though ;-) See:
> 
> http://news.povray.org/3c7bb095@news.povray.org
> 
> Christoph


I remember. This is how I got the idea in the first place, and I've been 
inspired ever since!

I've tried many variations of the same technique, including the addition 
of repeated pigment functions, min/max function compilations and other 
various function tweaks. I'm wondering now how I could implement a 
logical function into this..... select(a,b,c). It would have to evaluate 
the last evaluation to be really interesting.

I wonder what happened to Theis, the guy who was developing these 
functions for real-world shape evaluation/file reduction.....

-Samuel Benge

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Samuel Benge wrote:

> Hello folks. Had an isosurface attack earlier and this is the product.
> Sorry about the file size, but I had to reduce some jpeg artifacts.
> 
> The base shape (an octahedron) was warped with multiple passes of x, y
> and z cos functions using a #while loop. Each cos function is scaled
> twice as large as the next (both in size and strength). The variable
> responsible for this begins with a value of 1 and counts by itself till
> it reaches 128 like this:
> #declare V=V+V;
> 
> It rendered relatively fast so I added one 2x2 area_light to help the
> initial point light.
> 
> Questions, comments, ideas?
> 
> -Samuel Benge

Neat.
It has the feel of a fractal about it.

BTW my math isn't the best, so your explaination kind of
went over my head :-).

-- 
Bill Hails

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Bill Hails wrote:


> Neat.
> It has the feel of a fractal about it.
> 

and on reflection, something about it reminds me of Escher.

-- 
Bill Hails

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Sam, great work as always. Care to post the code? Love to see that function.
Best,
Dennis.

"Samuel Benge" <stb### [at] hotmailcom> wrote in message
news:407### [at] hotmailcom...
> Hello folks. Had an isosurface attack earlier and this is the product.
> Sorry about the file size, but I had to reduce some jpeg artifacts.
>
> The base shape (an octahedron) was warped with multiple passes of x, y
> and z cos functions using a #while loop. Each cos function is scaled
> twice as large as the next (both in size and strength). The variable
> responsible for this begins with a value of 1 and counts by itself till
> it reaches 128 like this:
> #declare V=V+V;
>
> It rendered relatively fast so I added one 2x2 area_light to help the
> initial point light.
>
> Questions, comments, ideas?
>
> -Samuel Benge
>


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

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"Samuel Benge" <stb### [at] hotmailcom> schrieb im Newsbeitrag
news:407### [at] hotmailcom...
> Christoph Hormann wrote:
>
> > Neat, you are not the first one trying the though ;-) See:
> >
> > http://news.povray.org/3c7bb095@news.povray.org
> >
> > Christoph
>
>
> I remember. This is how I got the idea in the first place, and I've been
> inspired ever since!
Hi Samuel,
I'm glad that I could inspire You digging deeper into this topic !

> I've tried many variations of the same technique, including the addition
> of repeated pigment functions, min/max function compilations and other
> various function tweaks. I'm wondering now how I could implement a
> logical function into this..... select(a,b,c). It would have to evaluate
> the last evaluation to be really interesting.
Cool, sounds interesting to do that with other base-functions than
sin/cos. How does it look like?

> I wonder what happened to Theis, the guy who was developing these
> functions for real-world shape evaluation/file reduction.....
I'm here :)
I think i should post a bit more frequently, but unfortunately
I'm not that constantly productive like many others in these groups.
But if I make something new/interesting i'll post it.
At the moment I'm working on an entry for the fractal-code-competition.
I'm curious how the reactions will be =)

> -Samuel Benge

Thies

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Thies Heidecke wrote:

> "Samuel Benge"

>>It would have to evaluate
>>the last evaluation to be really interesting.
>>
> Cool, sounds interesting to do that with other base-functions than
> sin/cos. How does it look like?


It doesn't. I haven't figured out a legal way to add the functions 
together without POV telling me to #undef my function first.

 
> I'm here :)
> I think i should post a bit more frequently, but unfortunately
> I'm not that constantly productive like many others in these groups.
> But if I make something new/interesting i'll post it.
> At the moment I'm working on an entry for the fractal-code-competition.
> I'm curious how the reactions will be =)
> 
> Thies


I'm looking forward to it!

-Samuel Benge

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Looks like one of the lakes around here, where there were inlets but no 
outlets, so it got saltier and saltier. Then they started syphoning the 
water for the city, and the level dropped and all these rocks came out 
of the water looking like this.

-- 
Darren New, San Diego CA USA (PST)
   I am in geosynchronous orbit, supported by
   a quantum photon exchange drive....

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Darren New wrote:

> Looks like one of the lakes around here, where there were inlets but no 
> outlets, so it got saltier and saltier. Then they started syphoning the 
> water for the city, and the level dropped and all these rocks came out 
> of the water looking like this.
 
Do you have any photos of that? I'd be interested in seeing them :)


-Samuel Benge

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Samuel Benge wrote:
> Do you have any photos of that? I'd be interested in seeing them :)

OK, this lake is somewhere approximately between Yosemite and San Diego. 
:-) It used to feed water to LA (and may still, at a reduced rate) 
before the decided it was too scenic to drain. I fear I was still 
running on the lousy snapshot camera at the time.

In any case, for a sense of scale, it's probably between 5 and 10 feet 
from water to the highest point on these "rocks". They're very crumbly, 
like you'd expect basically sandstone made out of salt to be. And if you 
visit, wear long socks.

-- 
Darren New, San Diego CA USA (PST)
   I am in geosynchronous orbit, supported by
   a quantum photon exchange drive....

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Attachments:
Download 'scan0007.jpg' (43 KB) Download 'scan0006.jpg' (51 KB)

Preview of image 'scan0007.jpg'

Preview of image 'scan0006.jpg'

Darren New wrote:

> OK, this lake is somewhere approximately between Yosemite and San Diego. 
> :-) It used to feed water to LA (and may still, at a reduced rate) 
> before the decided it was too scenic to drain. I fear I was still 
> running on the lousy snapshot camera at the time.


Hey, thanks for posting.

So they are somewhere between San Diego and Yosemite..... was it Inyo 
County, perhaps?

 
> In any case, for a sense of scale, it's probably between 5 and 10 feet 
> from water to the highest point on these "rocks". They're very crumbly, 
> like you'd expect basically sandstone made out of salt to be.


I've only had dreams of such rock formations.... Of course, in the 
dreams, they are much bigger :c)

> And if you 
> visit, wear long socks.

Were there lots of weeds?

-Samuel Benge

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Samuel Benge wrote:
> So they are somewhere between San Diego and Yosemite..... was it Inyo 
> County, perhaps?

Honestly, no idea.

> I've only had dreams of such rock formations.... Of course, in the 
> dreams, they are much bigger :c)

Then you want to look into Bryce Canyon and Zion National Park. Those 
rock formations are several stories high. Ever see the "Road Runner" 
cartoons? When I was there, I kept expecting to see holes in the shape 
of coyotes in the dirt.

>> And if you visit, wear long socks.
> Were there lots of weeds?

Lots of swamp grass, but the ground was black with salt-loving insects.

-- 
Darren New, San Diego CA USA (PST)
   I am in geosynchronous orbit, supported by
   a quantum photon exchange drive....

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Wasn't it Darren New who wrote:
>Samuel Benge wrote:
>> Do you have any photos of that? I'd be interested in seeing them :)
>
>OK, this lake is somewhere approximately between Yosemite and San Diego. 
>:-) It used to feed water to LA (and may still, at a reduced rate) 
>before the decided it was too scenic to drain. I fear I was still 
>running on the lousy snapshot camera at the time.
>
>In any case, for a sense of scale, it's probably between 5 and 10 feet 
>from water to the highest point on these "rocks". They're very crumbly, 
>like you'd expect basically sandstone made out of salt to be. And if you 
>visit, wear long socks.

That looks rather like the picture from Pink Floyd's "Wish You Were
Here", which was taken at some place called "Lake Mono".

-- 
Mike Williams
Gentleman of Leisure

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Mike Williams wrote:
> That looks rather like the picture from Pink Floyd's "Wish You Were
> Here", which was taken at some place called "Lake Mono".

That name sounds right.

-- 
Darren New, San Diego CA USA (PST)
   I am in geosynchronous orbit, supported by
   a quantum photon exchange drive....

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> 
>> I've only had dreams of such rock formations.... Of course, in the 
>> dreams, they are much bigger :c)
> 
> 
> Then you want to look into Bryce Canyon and Zion National Park. Those 
> rock formations are several stories high. Ever see the "Road Runner" 
> cartoons? When I was there, I kept expecting to see holes in the shape 
> of coyotes in the dirt.

Hey, you can't say that here without backing that with pictures :).

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andrel wrote:
> Hey, you can't say that here without backing that with pictures :).

STFW. ;-) At least I remembered what this one was called.

-- 
Darren New, San Diego CA USA (PST)
   I am in geosynchronous orbit, supported by
   a quantum photon exchange drive....

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