"SharkD" <nomail@nomail> schreef in bericht 
news:web.4876ebc733ed6cd5e4c3f1e10@news.povray.org...
> Here's another render after some settings were tweaked. It looks a bit 
> better
> upon close inspection (fewer tiny "swirls"), but somehow doesn't look as 
> good
> from afar.
>
Amazing. You can almost see how plate tectonics work.Some continents are 
breaking up; others appear to be merging.

Thomas

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"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> "SharkD" <nomail@nomail> schreef in bericht
> news:web.4875c35533ed6cd5b319b3150@news.povray.org...
> >I aim to incorporate this into my Solar System include. The idea is that
> >the
> > amount of snowfall and sea level is changes with the planet's incidence
> > with
> > respect to the system sun. I trawled the web for some solar functions and
> > was
> > having difficulty implementing them when I last was working on the
> > project.
>
> It looks very promising indeed. Note that sea-level is not influenced by the
> planet's incidence, except maybe with planets having seas the size of ponds
> :-)
> But vegetation most certainly is of course.
>
> Thomas

Thanks for the compliments! Unfortunately, I did a render of several frames with
the globe spinning, and the texture doesn't look so good from the other side.
The pigment requires further tweaks. Doh!

What I meant in regards to the sea level dropping was that sea levels would
change as ice caps grew larger. You're right, it doesn't have anything to do
with the axial tilt, but I had also hoped to model other orbital
characteristics.

I have found a good formula on the Web in the form of a spreadsheet for
determining solar energy at a given point and time. I'm in the process of
replacing constants in the formula with variables so that the formula can be
generalized for any planet in any solar system. I'm very slow at it, though I
am progressing a bit at a time. The formula is not commented very well, so it's
not always clear what the source of the constants. For instance, the next step I
am tasked with is to determine which constant(s) originate from the eccentricity
of the Earth's elliptical orbit.

The other problem is that the formula produces a single value for a given
moment. What I require is the average value over a 24 hour period. It's been
many years since I studied calculus, and I forgot how to calculate the mean
value of a continuous function. I'm in the process of finding oput how to do
this.

Here is the spreadsheet in question:

http://www.sci.fi/~benefon/solenergy.xls

It is a bit sloppy. The version on my harddrive is cleaned up, reorganized and
commented so it's more clear. If you would care to assist please take a look at
it, or I could upload my latest version.

-Mike

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On 11-Jul-08 7:12, SharkD wrote:
> Here's another render after some settings were tweaked. It looks a bit better
> upon close inspection (fewer tiny "swirls"), but somehow doesn't look as good
> from afar.
> 
> -Mike
> 
> 
> 
> ------------------------------------------------------------------------
> 
Heh, the ghostbuster slime monster disappeared :(

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"SharkD" <nomail@nomail> wrote in message
news:web.4876834a33ed6cd5e116e5c40@news.povray.org...
> Originally, I had intended to use isosurfaces. However, I ran into
problems,
> described here:
>
>
http://news.povray.org/povray.general/thread/%3Cweb.47acd95f26eb41a7ce83de88
0@news.povray.org%3E/
>

I think this is the same problem I ran into with my binary planet. I
eventually fixed the problem by adding "accuracy 1/100000" in the isosurface
function


--
- Nekar X -

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"Nekar" <nek### [at] gmailcom> wrote:
> I think this is the same problem I ran into with my binary planet. I
> eventually fixed the problem by adding "accuracy 1/100000" in the isosurface
> function
>
>
> --
> - Nekar X -

Wow! That did the trick. Thanks!

-Mike

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The latest version. The land textures are a bit better, though the edges could
be slightly smoother. There are also too many disconnected or fragmented
land-locked bodies of water, but I don't think there's anything I can do about
that.

-Mike

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Attachments:
Download 'pigment_test.png' (200 KB)

Preview of image 'pigment_test.png'

SharkD nous illumina en ce 2008-07-12 22:01 -->
> The latest version. The land textures are a bit better, though the edges could
> be slightly smoother. There are also too many disconnected or fragmented
> land-locked bodies of water, but I don't think there's anything I can do about
> that.
> 
> -Mike
> 
> 
> 
> ------------------------------------------------------------------------
> 
Just tell that those a large lakes and inner seas.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you have ever brought your 
computer to its knees by mistakenly launching 64 simultaneous frames to be 
traced, while trying to maximizing the benefits of parallelizing them.
Carsten Whimster

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This latest version show variation in vegetation due to latitude in addition to
elevation. You'll notice some deserts as well as brownish tundra near the
poles.

-Mike

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Attachments:
Download 'pigment_test_t.png' (195 KB)

Preview of image 'pigment_test_t.png'

Here's a higher resolution render. There's a little too much brown around the
tropics. Also, the gradations are a bit too smooth. I'll have to introduce a
bit more of a speckled appearance.

-Mike

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Attachments:
Download 'pigment_test_u.png' (456 KB)

Preview of image 'pigment_test_u.png'

SharkD nous illumina en ce 2008-07-14 00:54 -->
> Here's a higher resolution render. There's a little too much brown around the
> tropics. Also, the gradations are a bit too smooth. I'll have to introduce a
> bit more of a speckled appearance.
> 
> -Mike
> 
> 
> 
> ------------------------------------------------------------------------
> 
Nice.
A little side note: From space, deserts don't look tan or brown, but red, 
various shades of red.

-- 
Alain
-------------------------------------------------
No matter how good she looks, some other guy is sick and tired of putting up 
with her shit.
	Men's Room, Linda's Bar and Grill, Chapel Hill , NC

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