3E89FD53.12F835E6@gmx.de...

> snip

Wow!, these are really impressive images, and
very beautiful.
A lot of time and work invested here, but with
a great result.

> A short distance view with clouds of parts
> of europe (with 2.5x exaggerated height) can be seen on:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a2.jpg
> the same without clouds on:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a1.jpg

Hey, I can see my house in those...:-)

> I also made a view with natural height scale of western himalayas and
> karakorum:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a3l.jpg

Wow, Wow, Wow. Really great.

I've saved all the files in my HD.
Thank you very much for sharing them.
Yours Sincerely.

Txemi Jendrix
http://www.txemijendrix.com

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Those are delicious! I am tempted to make some quip about taking 
landscape tracing to new heights, but I'll spare you.

-Jim

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> Scattering media would be overkill since you can simply use
> different media for light and dark side.


Wellll...... it would be ever so slightly different =)

(really, only right near the shadow line)

 - Slime
[ http://www.slimeland.com/ ]

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Slime wrote:
> Wellll...... it would be ever so slightly different =)
> (really, only right near the shadow line)

That's what gradients are for.

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

-----BEGIN GEEK CODE BLOCK-----
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PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
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> That's what gradients are for.


That's not what I was referring to. The shadow of the earth would blacken
out the shadowed side, except for the part of the media that stuck out right
above the shadow line. So right on the edges there, there would be parts
illuminated that wouldn't be if the media were split completely in half.
It's hard to describe exactly what I'm talking about.

Of course, if you really want to be picky, there's also the issue of
scattering media self-shadowing, which would be extremely hard to model 100%
correctly without scattering media =)

But I was just trying to get your goat; I'm not really interested in
defending this =)

 - Slime
[ http://www.slimeland.com/ ]

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Where are the icey northpole?
Not to mention, the southpole?

Nice render, anyway.

Regards,
Hugo

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Renderdog wrote:
> 
> Wow, those are impressive images! I've never seen an image such as your
> Himalaya image, where you can see the curvature of the earth and the
> non-smoothness of the surface (mountains). It would make a great backdrop
> for an animation. I like the atmosphere also.

Thanks.

> How was the earth's surface modeled, as a triangle mesh or some other
> method?

A mesh would have taken way too much memory.  Remember the whole earth
with 1km resolution in a regular lat/lon mesh would mean about 1.8 billion
triangles.  A 45x45 degree tile still has 29 million vertices which (with
normal vectors) would use about 700 Mb (not counting the face and normal
indices!)

I used an isosurface with an image_map pigment function defining the
height of the terrain.  This only uses 2 byte per pixel and nothing more
(about 56 Mb per tile for the height data). 

> Another way to show the depths of the seas would be to color-code a smooth
> surface (deeper waters darker blue).

I have also made test with color depending on the height and without the
image_map texture.  Will see if i can post some sample for that too.

> How long did it take to render? I've always been impressed with how fast
> POV-Ray can render huge files.

The whole image at 6400x4800 took about 1-2 days.  The speed of rendering
an isosurface does not much depend on the detail level (although more
detailed data of course requires higher max_gradient).  

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 28 Feb. 2003 _____./\/^>_*_<^\/\.______

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Hugo Asm wrote:
> 
> Where are the icey northpole?
> Not to mention, the southpole?
> 

The south pole is not visible. :-)  There is data for the polar ice cover
but i did not try to add it yet.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 28 Feb. 2003 _____./\/^>_*_<^\/\.______

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Hi!

this is ages after you posted this, but i was wondering if i could use your
picture of the earth and use it for my own personal use?

Thanks a lot!!!















Christoph Hormann <chr### [at] gmxde> wrote:
> At the first glance this probably looks like yet another boring earth
> image but it is somewhat different.
>
> I used the 1km resolution data sets for geometry and coloring available
> on:
>
> http://earthobservatory.nasa.gov/Newsroom/BlueMarble/
>
> and used real surface geometry instead of bump mapping.  Of course the
> detail is hardly visible at this size, the second image shows a sample
> from the original render at 6400x4800 pixel size.
>
> It was of course not possible to render the whole planet in one piece, the
> height data alone is about 2GB.  Therefore i split it into 45x45 degree
> tiles and rendered them one after the other (with some overlap).
>
> Files with cloud coverage data are available at the mentioned site too but
> with strongly varying quality.  A short distance view with clouds of parts
> of europe (with 2.5x exaggerated height) can be seen on:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a2.jpg
>
> the same without clouds on:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a1.jpg
>
> I searched a lot for cloud height data which would be important for
> realistic clouds but i could not find anything useful.
>
> I also made a view with natural height scale of western himalayas and
> karakorum:
>
> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a3l.jpg
>
> this shows the available detail level in the data and also the varying
> quality in some parts (note the broad band of lower quality on the right).
>
> Christoph
>
> --
> POV-Ray tutorials, include files, Sim-POV,
> HCR-Edit and more: http://www.tu-bs.de/~y0013390/
> Last updated 28 Feb. 2003 _____.//^>_*_<^/.______

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See the following:

http://www.wikipov.org/ow.asp?EarthModel


Neil

"cedriccrucke" <ced### [at] hotmailcom> wrote in message 
news:web.41fa53c2bf3d391c20b6508a0@news.povray.org...
> Hi!
>
> this is ages after you posted this, but i was wondering if i could use 
> your
> picture of the earth and use it for my own personal use?
>
> Thanks a lot!!!
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Christoph Hormann <chr### [at] gmxde> wrote:
>> At the first glance this probably looks like yet another boring earth
>> image but it is somewhat different.
>>
>> I used the 1km resolution data sets for geometry and coloring available
>> on:
>>
>> http://earthobservatory.nasa.gov/Newsroom/BlueMarble/
>>
>> and used real surface geometry instead of bump mapping.  Of course the
>> detail is hardly visible at this size, the second image shows a sample
>> from the original render at 6400x4800 pixel size.
>>
>> It was of course not possible to render the whole planet in one piece, 
>> the
>> height data alone is about 2GB.  Therefore i split it into 45x45 degree
>> tiles and rendered them one after the other (with some overlap).
>>
>> Files with cloud coverage data are available at the mentioned site too 
>> but
>> with strongly varying quality.  A short distance view with clouds of 
>> parts
>> of europe (with 2.5x exaggerated height) can be seen on:
>>
>> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a2.jpg
>>
>> the same without clouds on:
>>
>> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a1.jpg
>>
>> I searched a lot for cloud height data which would be important for
>> realistic clouds but i could not find anything useful.
>>
>> I also made a view with natural height scale of western himalayas and
>> karakorum:
>>
>> http://www.schunter.etc.tu-bs.de/~chris/files/earth_a3l.jpg
>>
>> this shows the available detail level in the data and also the varying
>> quality in some parts (note the broad band of lower quality on the 
>> right).
>>
>> Christoph
>>
>> --
>> POV-Ray tutorials, include files, Sim-POV,
>> HCR-Edit and more: http://www.tu-bs.de/~y0013390/
>> Last updated 28 Feb. 2003 _____.//^>_*_<^/.______
>
>
>

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