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Does anyone know, if someone ever did a conversion from the scientific
star classifications (luminosity and color, maybe even star sizes) into
our POV-Ray format? Thanks.
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Le 16-01-25 05:22, Sven Littkowski a écrit :
> I found this table on the big, wide Internet, but I still need some
> idea, how to express each star type's luminosity in POV-Ray. Ideas and
> suggestions welcome.
>
The full list is : OBAFGKMN
There is a whimsical mnemonic phrase used to remember them:
O Be A Fine Girl, Kiss Me Now.
O0 been blue tending on violet, and N9 been deep red, usualy belonging
to red dwarf stars.
This classification deal only with the spectral type.
The numerical values following goes from 0 to 9
Basicaly, each code equate to a black body temperature.
You can find those temperatures online.
Finaly, you can use CIElight.inc to get the appropriate RGB values.
Next, for the luminausity, you need to use the Magnitude of the star.
There is the apparent and absolute magnitude.
Apparent is how bright the star appear from the Earth, while the
absolute magnitude use a normalised distance.
As for the actual size of the star, there is no absolute way to get it.
There are 3 main size families: Main sequence, dwarf and giant. There is
also the super giant class that is actualy an extention of the giant class.
On the main sequence, the star size can range from 0.1 Sun radius (type
N), to near 1000 Sun radius (type O0)
The O type stars from the main sequence are also part of the giant
class, while the N type are also part of the dwarf class.
For the dwarf stars, the radius stay around Earth radius to 0.15 Sun
radius regardless of the spectral type.
All giant class stars are at least 500 times the Sun's radius, and super
giants are at least 10000 Sun radius, some been large enough to contain
Neptune's orbit.
I don't remember how many astronomy books I read in my life... But, it's
a LOT!
Alain
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Thanks. Processing it now... :-)
My aim is, to create a realistic sun visible from closer distance.
Means, with irregular and random surface features, like lighter and
darker areas, and even protuberances, and all such.
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On 1/25/2016 6:54 PM, Sven Littkowski wrote:
> Thanks. Processing it now... :-)
>
> My aim is, to create a realistic sun visible from closer distance.
> Means, with irregular and random surface features, like lighter and
> darker areas, and even protuberances, and all such.
>
You should make a planetarium with all the planets.
Mike
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That is what I intend. I have a useful connection to someone inside
Aricibo, that large star observatory. Through him I have now access to
the DB of all exoplanet data. I work on a project, to create (through
POV-Ray) automatically a render of each star system with exoplanets,
focusing at first on those systems that could maybe host life
(exoplanet(s) inside the Green Belt).
But besides, I can use it also for my Space Ark project.
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Le 16-01-25 18:54, Sven Littkowski a écrit :
> Thanks. Processing it now... :-)
>
> My aim is, to create a realistic sun visible from closer distance.
> Means, with irregular and random surface features, like lighter and
> darker areas, and even protuberances, and all such.
>
The basic granularity of the Sun's surface have some similarity with the
granite pattern.
For the larger scale details, a bozo pattern with a colour_map
transparent for the most part and some small lighter and slightly larger
darker areas should look nice.
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Thanks for the useful hints, I am going to try out.
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On 25.01.2016 11:10, Sven Littkowski wrote:
> Does anyone know, if someone ever did a conversion from the scientific
> star classifications (luminosity and color, maybe even star sizes) into
> our POV-Ray format? Thanks.
For realistic light colors you can also check out lightsys
(Automatic Light System for POV-Ray, Version 4d)
http://www.ignorancia.org/en/index.php?page=Lightsys
Among other things it contains a blackbody macro to
generate correct color for a given star temperature.
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