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From: Mätes
Subject: Stars in the suns neighborhood - 3D-Anaglyph
Date: 5 Nov 2020 18:20:01
Message: <web.5fa441496ace85e622e00ad30@news.povray.org>
Hi everyone,

some months/years ago I created an animation that shows the sun and the nearest
stars around. The Sun is centered, Vega about 25 lightyears away.
Rendered on a Raspberry Pi 3B.

https://www.youtube.com/watch?v=sSlhDgHcHHM

Also there is a 3D-anaglyph-version of this video:

https://www.youtube.com/watch?v=8BzW-8AcHDY

At the moment I reorder my youtube-account, more of this will be published
later.

Hope it looks nice,

Mätes


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From: StephenS
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 5 Nov 2020 22:10:00
Message: <web.5fa477331c7ddaafa17490550@news.povray.org>
"Mätes" <nomail@nomail> wrote:
> Hi everyone,
>
> some months/years ago I created an animation that shows the sun and the nearest
> stars around. The Sun is centered, Vega about 25 lightyears away.
> Rendered on a Raspberry Pi 3B.
>
> https://www.youtube.com/watch?v=sSlhDgHcHHM
>
> Also there is a 3D-anaglyph-version of this video:
>
> https://www.youtube.com/watch?v=8BzW-8AcHDY
>
> At the moment I reorder my youtube-account, more of this will be published
> later.
>
> Hope it looks nice,
>
> Mätes

I like the 3d version, nice level of detail for anaglyph.

Stephen S


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From: Kenneth
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 6 Nov 2020 03:20:01
Message: <web.5fa4bfe01c7ddaafd98418910@news.povray.org>
"StephenS" <nomail@nomail> wrote:

>
> I like the 3d version, nice level of detail for anaglyph.
>

Same here. It's interesting to see that the stars in our 'local bubble' do not
uniformly fill the space, but are sort of bunched-up in one hemisphere, more or
less. (Or maybe that's just a visual effect of some of the stars being larger
than others?)

Nice 3-D effect!


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From: Mätes
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 7 Nov 2020 13:10:01
Message: <web.5fa69c8e1c7ddaaf9b4948ca0@news.povray.org>
> I like the 3d version, nice level of detail for anaglyph.
>
> Same here. It's interesting to see that the stars in our 'local bubble' do not
> uniformly fill the space.

Thats why I have done it. I wanted to know where the stars are, what it would
look like to see the stars from a few lightyears away.

Mätes


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From: Thomas de Groot
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 8 Nov 2020 07:34:02
Message: <5fa79f6a$1@news.povray.org>
Op 07/11/2020 om 14:09 schreef M�tes:
>> I like the 3d version, nice level of detail for anaglyph.
>>
>> Same here. It's interesting to see that the stars in our 'local bubble' do not
>> uniformly fill the space.
> 
> Thats why I have done it. I wanted to know where the stars are, what it would
> look like to see the stars from a few lightyears away.
> 
> Mätes
> 
> 

The Sun is centered in your animation, but is that also the case for its 
position in the Local Group? Probably not. Does that not introduce a 
"deformation" in the way the group is viewed from the outside?

Nice work btw.

-- 
Thomas


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From: Mätes
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 8 Nov 2020 09:55:00
Message: <web.5fa7bf5a1c7ddaaf9b4948ca0@news.povray.org>
> The Sun is centered in your animation, but is that also the case for its
> position in the Local Group? Probably not. Does that not introduce a
> "deformation" in the way the group is viewed from the outside?

Dont exactly understand what do you mean with that.
"Local Group" most of the time is used when talking about galaxies.
And yes, the sun ist centered only in my animation. Beside of that she is the
center of virtually nothing. Not the Local Cloud, the Local Bubble or anything
else.

Here the english Wikipedia-Site of the Local Bubble.
https://en.wikipedia.org/wiki/Local_Bubble

Also you can check out the german site.
It has a few nice drawings of our surrounding.
https://de.wikipedia.org/wiki/Lokale_Blase

Mätes


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From: Kenneth
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 8 Nov 2020 19:45:05
Message: <web.5fa84a431c7ddaafd98418910@news.povray.org>
"Mätes" <nomail@nomail> wrote:
> > The Sun is centered in your animation, but is that also the case for its
> > position in the Local Group? Probably not. Does that not introduce a
> > "deformation" in the way the group is viewed from the outside?
>

> ...And yes, the sun ist centered only in my animation. Beside of that she is the
> center of virtually nothing. Not the Local Cloud, the Local Bubble or anything
> else.
>

Thomas means that if the animation rotates not around the Sun but around star
268 G. Ce instead (for example), ALL of the stars *in your animation* will
appear to be on one side of 268 G. Ce -- with a big empty space on the other
side, creating a different 'visual' deformation of the group. (Star 268 G. Ce is
at the extreme left, when the animation is at the halfway point.)

Yes, I see now that the the apparent 'deformation' of the group of LARGE stars
in the animation is a kind of optical illusion.

Question: Are the 'large' stars actually larger in real size? Or are they just
made larger for the animation because they have the labels?

There are many smaller stars in the animation, and they do appear to be
uniformly distributed in a sphere, more or less. Unfortunately, my red/green
anaglyph glasses make them very dark and hard to see.

Thanks for creating this animation, especially in 3-D.


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From: Mätes
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 8 Nov 2020 21:35:01
Message: <web.5fa864551c7ddaaf9b4948ca0@news.povray.org>
Okay, I understand.

I have to make clear, the animation was a first try, not trimmed to be
scientific realistic.

The positions and the distances of the stars are real, I used the 150 NEAREST
Stars in the Database.
The size of the spheres represents more or less the brighness of the stars, but
as you can see only in 2 steps, big and small spheres.
So, for example, a big sphere here can be a 2.9 mag bright star and a small
sphere a 3.0 (the smaller mag = the brighter the star!).
The animation is from 2019 or even 2018, so I dont know the exact parameters.

So yes, it is an optical illusion, that there are groups and brighter on one
side of the sun.

But its interresting to hear that someone things about it and not only wants to
"see" this but also likes to know more details. Maybe I can relive the scripts
in the next weeks and create a more realistic one. And also write about the
exact parameters I used. But I cant promise it, much to do at the moment.

Otherwise I remember, that it was really hard to create an eye-friendly version
and a realistic one at the same time. I tried many different parameters and most
of them didnt look well. The difference of the brightness is so big that most of
the stars disappeared, so I have choosen only big and small spheres.

Mätes


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From: Thomas de Groot
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 9 Nov 2020 07:30:19
Message: <5fa8f00b$1@news.povray.org>
Op 08/11/2020 om 10:50 schreef M�tes:
>> The Sun is centered in your animation, but is that also the case for its
>> position in the Local Group? Probably not. Does that not introduce a
>> "deformation" in the way the group is viewed from the outside?
> 
> Dont exactly understand what do you mean with that.
> "Local Group" most of the time is used when talking about galaxies.
> And yes, the sun ist centered only in my animation. Beside of that she is the
> center of virtually nothing. Not the Local Cloud, the Local Bubble or anything
> else.
> 
> Here the english Wikipedia-Site of the Local Bubble.
> https://en.wikipedia.org/wiki/Local_Bubble
> 
> Also you can check out the german site.
> It has a few nice drawings of our surrounding.
> https://de.wikipedia.org/wiki/Lokale_Blase
> 

Sorry for my use of terms. I am aware of "Local Group" representing 
galaxies indeed. Fortunately, Kenneth rightly interpreted my thoughts :-)

-- 
Thomas


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From: Mätes
Subject: Re: Stars in the suns neighborhood - 3D-Anaglyph
Date: 11 Nov 2020 21:10:01
Message: <web.5fac529c1c7ddaafced0e07b0@news.povray.org>
> Sorry for my use of terms. I am aware of "Local Group" representing
> galaxies indeed. Fortunately, Kenneth rightly interpreted my thoughts :-)

No problem :)

I added 4 new videos, two different in 2D and 3D.
All of them test-creations from 1999 as the two previously published.
But maybe with nice 3D-effects inside.

Please check the playlist:
https://www.youtube.com/playlist?list=PLyqRFFB9kitzoaILwoMInxo7bd5LY7WEG

Adios,
Martin


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