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"Fernando Gonzalez del Cueto" <fgd### [at] hotmail com> wrote
> They look very nice!
>
> Are the heights on a real scale? I saw Africa-Europe image and it seems to
> me that the elevations are exagerated, but perhaps I have a wrong
intuition.
You are right. With the correct scale, max elevation would be fraction of a
pixel at that resolution and thus rather imperceptible.
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Fernando Gonzalez del Cueto wrote:
> Are the heights on a real scale? I saw Africa-Europe image and it seems to
> me that the elevations are exagerated, but perhaps I have a wrong
> intuition.
>
As explained in the text above the images, the height (and the atmosphere)
is scaled by a factor of 30.
Otherwise Earth would be boringly flat ;)
Wolfgang
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Christoph Hormann wrote:
> news://news.povray.org/3E89FD53.12F835E6%40gmx.de
> http://news.povray.org/povray.binaries.images/31083/220908/#220908
>
> :-)
>
I know you did some similar things although I did not have the image
in memory very well. Gonna look at them again...
> I'm not sure how you render the 1/60 degree topography with 1/30 degree
> color with only 600Mb memory - according to my calculations this would
> take more.
>
Let's see:
Topo is 1/60 degree, hence 21600 x 10800 pixels, i.e. 222 mega-pixels.
Thus, I need 444 Mb of height data (it's 2 byte).
Adding 1/30 degree RGB color, 10800 x 5400 x 3 = 167 Mb
Together, that's 611 Mb.
POVRay actually uses 620 Mb VM (according to the kernel).
I wonder where I could habe failed to calculate that correctly ;)
> I'd strongly reduce the height exaggeration (with 2 km grid 5x-10x should
> give quite pleasant results)
>
Hmm... Maybe I'll give it a try.
My Mars images use height exaggeration of 10. But Mars has more
extreme topography.
http://www.cip.physik.uni-muenchen.de/~wwieser/render/img/mars/
(Take the 2048x1536 JPEG to see the craters.)
Wolfgang
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3f20165c@news.povray.org...
> I made some renderings of planet earth; color & topography.
> Medium-resolution images at:
>
> http://www.cip.physik.uni-muenchen.de/~wwieser/render/img/earth/
>
> I'll make some high-res images but first would like to get some
> comments.
Beautiful images. The exagerated heights add a nice touch
(surrealistic?). The image from Mars is the one I like most.
Seems like a planet from the little prince.
Keep on working on it.
Bye
Txemi Jendrix
http://www.txemijendrix.com
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Hey Wolfgang!
Great Images! Are we going to see some of the other planets, too?
> But Mars has more extreme topography.
Could you give us some figures, like deepest valley/highest peak?
Florian
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Nice work Wolfgang
I like the exagerated topography :)
Just 3 things:
Animation, Animation, Animation :)
(If at all possible)
Dave.
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Wolfgang Wieser wrote:
>
> [...]
> Topo is 1/60 degree, hence 21600 x 10800 pixels, i.e. 222 mega-pixels.
> Thus, I need 444 Mb of height data (it's 2 byte).
> Adding 1/30 degree RGB color, 10800 x 5400 x 3 = 167 Mb
> Together, that's 611 Mb.
> POVRay actually uses 620 Mb VM (according to the kernel).
All right, my quick estimate was a bit high. I remembered that the data
of my renders i posted the link for would have taken more than 3 Gb as a
whole but i use 1 km resolution for both the topography and the coloring
(and clouds in some cases).
> > I'd strongly reduce the height exaggeration (with 2 km grid 5x-10x should
> > give quite pleasant results)
> >
> Hmm... Maybe I'll give it a try.
> My Mars images use height exaggeration of 10. But Mars has more
> extreme topography.
>
> http://www.cip.physik.uni-muenchen.de/~wwieser/render/img/mars/
> (Take the 2048x1536 JPEG to see the craters.)
I did mars as well:
news://news.povray.org/3EC752E4.FCFDBF5D%40gmx.de
http://news.povray.org/povray.binaries.images/31675/225014/#225014
This is without exaggeration of height (but again twice the resolution for
the topography).
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 17 Jun. 2003 _____./\/^>_*_<^\/\.______
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> Animation, Animation, Animation :)
>
My next plan. Probably in a month or so...
It'll render forever, though.
Wolfgang
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Florian Brucker wrote:
> Hey Wolfgang!
>
> Great Images! Are we going to see some of the other planets, too?
>
Probably not. At least not likely in the next 3 months.
>> But Mars has more extreme topography.
> Could you give us some figures, like deepest valley/highest peak?
>
The large volvano is Olympus Mons -- said to be the highest volcano in
the solar system: it is 24km high and measures 550km across.
The large canyon system is called Vallis Marineris: it extends
over 4000km and is up to 7km deep.
(Copy&paste from my homepage ;)
Wolfgang
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Christoph Hormann wrote:
> I did mars as well:
>
> news://news.povray.org/3EC752E4.FCFDBF5D%40gmx.de
> http://news.povray.org/povray.binaries.images/31675/225014/#225014
>
Nice images.
Seems you found a color map of Mars somewhere...
> This is without exaggeration of height (but again twice the resolution for
> the topography).
>
IIRC, the 1/128 degree data did not include the poles at that time,
to I decided to use the 1/64 degree data.
Wolfgang
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