My attempt to use isosurface for 3D snowflakes was not so successful.
But I came up with another solution. I modified my 'Pollock' filter and
used it to 'filter' 2D image. See the source in p.b.s.f.

The image below has the original 2D snowflake #5 from 'snowflakes.inc'
(in the center). The rest snowflakes are just 'filtered' copies of that
original
with different levels of details.

Gena.

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Attachments:
Download 'snowflakes3d.jpg' (105 KB)

Preview of image 'snowflakes3d.jpg'

Yummy! :P

If they were made out of shugar I would eat them all he he he.


Best regards.

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These look real good, but how many does it take to make a snowball, and
more importantly how long would it take to render:-))

Also to make a realistic snowball or snowman the flakes would have to 
be crushed and squashed, a snowflake probably only looks like that while
it's in the air falling towards the ground, I'm sure it'll get bashed in
when it hits the ground or at least have some edges knocked off. 

These do look very pretty, I'm sure I'll be using them some time around 
christmas, thanks for sharing.

-- 
#local i=.1;#local I=(i/i)/i;#local l=(i+i)/i;#local ll=(I/i)/l;box{<-ll,
-((I/I)+l),-ll><ll,-l,ll>pigment{checker scale l}finish{ambient((I/l)/I)+
(l/I)}}sphere{<i-i,l-l,(I/l)>l/l pigment{rgb((I/l)/I)}finish{reflection((
I/l)/I)-(l/I)specular(I/l)/I}}light_source{<I-l,I+I,(I-l)/l>l/l} // Steve

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In article <slr### [at] zeroppsorguk>,
 Steve <ste### [at] zeroppsuklinuxnet> wrote:

> Also to make a realistic snowball or snowman the flakes would have to 
> be crushed and squashed, a snowflake probably only looks like that while
> it's in the air falling towards the ground, I'm sure it'll get bashed in
> when it hits the ground or at least have some edges knocked off. 

Don't you get snow? It sounds like you've never had a close look at it...
Snow that's been compressed or has been in a pile for a while doesn't 
have flakes like these, it gets more granular, especially if it is close 
to the freezing/melting point (which also seems to cause the largest 
flakes/crystals). Individual flakes often land and get buried without 
much damage though, you can find flakes in a handful of fresh fallen 
snow that look intact as far as the unaided eye can tell.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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On Mon, 04 Nov 2002 14:34:49 -0500, Christopher James Huff wrote:
> In article <slr### [at] zeroppsorguk>,
>  Steve <ste### [at] zeroppsuklinuxnet> wrote:
> 
>> Also to make a realistic snowball or snowman the flakes would have to 
>> be crushed and squashed, a snowflake probably only looks like that while
>> it's in the air falling towards the ground, I'm sure it'll get bashed in
>> when it hits the ground or at least have some edges knocked off. 
> 
> Don't you get snow? It sounds like you've never had a close look at it...
> Snow that's been compressed or has been in a pile for a while doesn't 
> have flakes like these, it gets more granular, especially if it is close 
> to the freezing/melting point (which also seems to cause the largest 
> flakes/crystals). Individual flakes often land and get buried without 
> much damage though, you can find flakes in a handful of fresh fallen 
> snow that look intact as far as the unaided eye can tell.
> 

Yes we have snow, but I can't say I've ever observed flakes, only in 
photographs on TV. 

-- 
%HAV-A-NICEDAY                    email mailto:ste### [at] zeroppsuklinuxnet
Steve                                web http://www.zeropps.uklinux.net/
                                             or http://start.at/zero-pps
  1:10am  up 130 days, 12:40,  2 users,  load average: 1.02, 1.02, 1.05

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In article <slr### [at] zeroppsorguk>,
 Steve <ste### [at] zeroppsuklinuxnet> wrote:

> Yes we have snow, but I can't say I've ever observed flakes, only in 
> photographs on TV.

You get snow, you've just never looked at it? You're weird...
I've read that most people don't believe you can see the moon in the 
daytime, though...it seems common for people to just not notice things, 
especially if they have to look up.
I just can't see how you can not notice the snowflakes landing on 
you...but I am the type of person who closely examines every new thing. 
And before I got glasses, I *had* to look closely at things.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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On Mon, 04 Nov 2002 21:23:10 -0500, Christopher James Huff wrote:
> In article <slr### [at] zeroppsorguk>,
>  Steve <ste### [at] zeroppsuklinuxnet> wrote:
> 
>> Yes we have snow, but I can't say I've ever observed flakes, only in 
>> photographs on TV.
> 
> You get snow, you've just never looked at it? You're weird...
> I've read that most people don't believe you can see the moon in the 
> daytime, though...it seems common for people to just not notice things, 
> especially if they have to look up.
> I just can't see how you can not notice the snowflakes landing on 
> you...but I am the type of person who closely examines every new thing. 
> And before I got glasses, I *had* to look closely at things.
> 

I suppose that's the problem really, I can't see all that well, (about 10
per cent of average).  Snowflakes just look like blobs, but next time it 
snows I think I'll go out with a magnifying glass. 

-- 
#local i=.1;#local I=(i/i)/i;#local l=(i+i)/i;#local ll=(I/i)/l;box{<-ll,
-((I/I)+l),-ll><ll,-l,ll>pigment{checker scale l}finish{ambient((I/l)/I)+
(l/I)}}sphere{<i-i,l-l,(I/l)>l/l pigment{rgb((I/l)/I)}finish{reflection((
I/l)/I)-(l/I)specular(I/l)/I}}light_source{<I-l,I+I,(I-l)/l>l/l} // Steve

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