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2 Dec 2022 11:20:09 EST (-0500)
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From: MichaelJF
Subject: Re: First play with Blender physics
Date: 19 Aug 2022 15:56:09
Message: <62ffead9$1@news.povray.org>
Am 18.08.2022 um 08:33 schrieb Thomas de Groot:
> Op 13/08/2022 om 16:41 schreef Thomas de Groot:
>> Op 12-8-2022 om 19:16 schreef MichaelJF:
>> Agreed. The fountain water looks good but not entirely satisfactory. 
>> Still, well done indeed.
>>
> 
> As I was just checking Rune Johansen's Inverse Kinematics macro for 
> another topic, I remembered his Particle System:
> 
>   https://runevision.com/3d/include/particles/
> 
> I am sure you know that one too... ;-)
> 
Thanks for the hint, but yes, I noticed Rune's work some years ago. 
There are more "particle systems" proposed within the pov community but 
most of them have the particles interacting with the environment only 
and not with each other, too. IIRC Rune's work is one of those. As a 
part of my diploma some more years ago I wrote a particle system with 
interacting particles (in two dimensions only) but I failed to convert 
it to pov since the numerical precision of the SDL is very poor. That 
was an intended decision by the pov team to solve a trade-off between 
parsing/rendering time and scene precision.

Best regards
Michael


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From: Thomas de Groot
Subject: Re: First play with Blender physics
Date: 20 Aug 2022 03:35:04
Message: <63008ea8$1@news.povray.org>
Op 19-8-2022 om 21:56 schreef MichaelJF:
> Am 18.08.2022 um 08:33 schrieb Thomas de Groot:
>> Op 13/08/2022 om 16:41 schreef Thomas de Groot:
>>> Op 12-8-2022 om 19:16 schreef MichaelJF:
>>> Agreed. The fountain water looks good but not entirely satisfactory. 
>>> Still, well done indeed.
>>>
>>
>> As I was just checking Rune Johansen's Inverse Kinematics macro for 
>> another topic, I remembered his Particle System:
>>
>>   https://runevision.com/3d/include/particles/
>>
>> I am sure you know that one too... ;-)
>>
> Thanks for the hint, but yes, I noticed Rune's work some years ago. 
> There are more "particle systems" proposed within the pov community but 
> most of them have the particles interacting with the environment only 
> and not with each other, too. IIRC Rune's work is one of those. As a 
> part of my diploma some more years ago I wrote a particle system with 
> interacting particles (in two dimensions only) but I failed to convert 
> it to pov since the numerical precision of the SDL is very poor. That 
> was an intended decision by the pov team to solve a trade-off between 
> parsing/rendering time and scene precision.
> 
I am getting curious now about that other particle system in Blender 
that you mentioned earlier... ;-)

-- 
Thomas


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From: Jörg "Yadgar" Bleimann
Subject: Re: First play with Blender physics
Date: 20 Aug 2022 12:13:09
Message: <63010815@news.povray.org>
Hi(gh)!

On 13.08.22 16:41, Thomas de Groot wrote:
> Op 12-8-2022 om 19:16 schreef MichaelJF:
> Agreed. The fountain water looks good but not entirely satisfactory. 
> Still, well done indeed.
> 
> If you want a weeping willow, Arbaro provides a very decent one.
> 
> http://arbaro.sourceforge.net/
> 
Interesting! I just bookmarked it for my Khyberspace project - there 
MUST be Populus afghanica and Pistacia cabulica in POV-Ray some day!

See you in Khyberspace!

Yadgar


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From: MichaelJF
Subject: Re: First play with Blender physics
Date: 20 Aug 2022 12:14:16
Message: <63010858@news.povray.org>
Am 20.08.2022 um 09:35 schrieb Thomas de Groot:
> Op 19-8-2022 om 21:56 schreef MichaelJF:
>> Am 18.08.2022 um 08:33 schrieb Thomas de Groot:
>>> Op 13/08/2022 om 16:41 schreef Thomas de Groot:
>>>> Op 12-8-2022 om 19:16 schreef MichaelJF:
>>>> Agreed. The fountain water looks good but not entirely satisfactory. 
>>>> Still, well done indeed.
>>>>
>>>
>>> As I was just checking Rune Johansen's Inverse Kinematics macro for 
>>> another topic, I remembered his Particle System:
>>>
>>>   https://runevision.com/3d/include/particles/
>>>
>>> I am sure you know that one too... ;-)
>>>
>> Thanks for the hint, but yes, I noticed Rune's work some years ago. 
>> There are more "particle systems" proposed within the pov community 
>> but most of them have the particles interacting with the environment 
>> only and not with each other, too. IIRC Rune's work is one of those. 
>> As a part of my diploma some more years ago I wrote a particle system 
>> with interacting particles (in two dimensions only) but I failed to 
>> convert it to pov since the numerical precision of the SDL is very 
>> poor. That was an intended decision by the pov team to solve a 
>> trade-off between parsing/rendering time and scene precision.
>>
> I am getting curious now about that other particle system in Blender 
> that you mentioned earlier... ;-)
> 
They call the other system in Blender "particle system". I used their 
"fluid simulation", what is in fact a particle system too. Sooner or 
later I will give the other approach a try. At the moment I have another 
project running within my precious spare time. Here is a first glimpse 
of my actual WIP.

Best regards
Michael


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From: Thomas de Groot
Subject: Re: First play with Blender physics
Date: 21 Aug 2022 02:15:14
Message: <6301cd72$1@news.povray.org>
Op 20/08/2022 om 18:14 schreef MichaelJF:
> Am 20.08.2022 um 09:35 schrieb Thomas de Groot:
>> Op 19-8-2022 om 21:56 schreef MichaelJF:
>>> Am 18.08.2022 um 08:33 schrieb Thomas de Groot:
>>>> Op 13/08/2022 om 16:41 schreef Thomas de Groot:
>>>>> Op 12-8-2022 om 19:16 schreef MichaelJF:
>>>>> Agreed. The fountain water looks good but not entirely 
>>>>> satisfactory. Still, well done indeed.
>>>>>
>>>>
>>>> As I was just checking Rune Johansen's Inverse Kinematics macro for 
>>>> another topic, I remembered his Particle System:
>>>>
>>>>   https://runevision.com/3d/include/particles/
>>>>
>>>> I am sure you know that one too... ;-)
>>>>
>>> Thanks for the hint, but yes, I noticed Rune's work some years ago. 
>>> There are more "particle systems" proposed within the pov community 
>>> but most of them have the particles interacting with the environment 
>>> only and not with each other, too. IIRC Rune's work is one of those. 
>>> As a part of my diploma some more years ago I wrote a particle system 
>>> with interacting particles (in two dimensions only) but I failed to 
>>> convert it to pov since the numerical precision of the SDL is very 
>>> poor. That was an intended decision by the pov team to solve a 
>>> trade-off between parsing/rendering time and scene precision.
>>>
>> I am getting curious now about that other particle system in Blender 
>> that you mentioned earlier... ;-)
>>
> They call the other system in Blender "particle system". I used their 
> "fluid simulation", what is in fact a particle system too. Sooner or 
> later I will give the other approach a try. At the moment I have another 
> project running within my precious spare time. Here is a first glimpse 
> of my actual WIP.
> 

Aaah! Very to the point at the moment indeed. Good start!

-- 
Thomas


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From: Alain Martel
Subject: Re: First play with Blender physics
Date: 21 Aug 2022 09:23:45
Message: <630231e1$1@news.povray.org>
Le 2022-08-20 à 12:14, MichaelJF a écrit :
> Am 20.08.2022 um 09:35 schrieb Thomas de Groot:
>> Op 19-8-2022 om 21:56 schreef MichaelJF:
>>> Am 18.08.2022 um 08:33 schrieb Thomas de Groot:
>>>> Op 13/08/2022 om 16:41 schreef Thomas de Groot:
>>>>> Op 12-8-2022 om 19:16 schreef MichaelJF:
>>>>> Agreed. The fountain water looks good but not entirely 
>>>>> satisfactory. Still, well done indeed.
>>>>>
>>>>
>>>> As I was just checking Rune Johansen's Inverse Kinematics macro for 
>>>> another topic, I remembered his Particle System:
>>>>
>>>>   https://runevision.com/3d/include/particles/
>>>>
>>>> I am sure you know that one too... ;-)
>>>>
>>> Thanks for the hint, but yes, I noticed Rune's work some years ago. 
>>> There are more "particle systems" proposed within the pov community 
>>> but most of them have the particles interacting with the environment 
>>> only and not with each other, too. IIRC Rune's work is one of those. 
>>> As a part of my diploma some more years ago I wrote a particle system 
>>> with interacting particles (in two dimensions only) but I failed to 
>>> convert it to pov since the numerical precision of the SDL is very 
>>> poor. That was an intended decision by the pov team to solve a 
>>> trade-off between parsing/rendering time and scene precision.
>>>
>> I am getting curious now about that other particle system in Blender 
>> that you mentioned earlier... ;-)
>>
> They call the other system in Blender "particle system". I used their 
> "fluid simulation", what is in fact a particle system too. Sooner or 
> later I will give the other approach a try. At the moment I have another 
> project running within my precious spare time. Here is a first glimpse 
> of my actual WIP.
> 
> Best regards
> Michael
Nice Northern lights.


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From: MichaelJF
Subject: Re: First play with Blender physics
Date: 21 Aug 2022 12:29:42
Message: <63025d76$1@news.povray.org>
Am 21.08.2022 um 15:23 schrieb Alain Martel:
> Le 2022-08-20 à 12:14, MichaelJF a écrit :
>> Am 20.08.2022 um 09:35 schrieb Thomas de Groot:
>>> Op 19-8-2022 om 21:56 schreef MichaelJF:
>>>> Am 18.08.2022 um 08:33 schrieb Thomas de Groot:
>>>>> Op 13/08/2022 om 16:41 schreef Thomas de Groot:
>>>>>> Op 12-8-2022 om 19:16 schreef MichaelJF:
>>>>>> Agreed. The fountain water looks good but not entirely 
>>>>>> satisfactory. Still, well done indeed.
>>>>>>
>>>>>
>>>>> As I was just checking Rune Johansen's Inverse Kinematics macro for 
>>>>> another topic, I remembered his Particle System:
>>>>>
>>>>>   https://runevision.com/3d/include/particles/
>>>>>
>>>>> I am sure you know that one too... ;-)
>>>>>
>>>> Thanks for the hint, but yes, I noticed Rune's work some years ago. 
>>>> There are more "particle systems" proposed within the pov community 
>>>> but most of them have the particles interacting with the environment 
>>>> only and not with each other, too. IIRC Rune's work is one of those. 
>>>> As a part of my diploma some more years ago I wrote a particle 
>>>> system with interacting particles (in two dimensions only) but I 
>>>> failed to convert it to pov since the numerical precision of the SDL 
>>>> is very poor. That was an intended decision by the pov team to solve 
>>>> a trade-off between parsing/rendering time and scene precision.
>>>>
>>> I am getting curious now about that other particle system in Blender 
>>> that you mentioned earlier... ;-)
>>>
>> They call the other system in Blender "particle system". I used their 
>> "fluid simulation", what is in fact a particle system too. Sooner or 
>> later I will give the other approach a try. At the moment I have 
>> another project running within my precious spare time. Here is a first 
>> glimpse of my actual WIP.
>>
>> Best regards
>> Michael
> Nice Northern lights.
Many Thanks to you and Thomas!

As ever, there is still room for improvement, but for the moment I'm 
content with my efforts to model an aurora borealis. The image was some 
kind of a study of concept. Now I try to improve the sky. At the moment 
I use a catalog of the 1628 brightest stars from a VizieR database. I 
project the entries to my sky-sphere. This sample represents the stars 
visible in a severly light polluted city like my living place Darmstadt, 
Germany, very well. The Milky Way is invisible here completely. Now I 
found a database of 120.00 stars published by the European Space Agency 
(Hipparcos-Catalogue). So the next experiment is to try to understand 
this data and to project them at my sky-sphere.

Best regards
Michael


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From: Bald Eagle
Subject: Re: First play with Blender physics
Date: 21 Aug 2022 15:20:00
Message: <web.63028441d994fd2e1f9dae3025979125@news.povray.org>
MichaelJF <fri### [at] t-onlinede> wrote:

> As ever, there is still room for improvement, but for the moment I'm
> content with my efforts to model an aurora borealis. The image was some
> kind of a study of concept. Now I try to improve the sky. At the moment
> I use a catalog of the 1628 brightest stars from a VizieR database. I
> project the entries to my sky-sphere. This sample represents the stars
> visible in a severly light polluted city like my living place Darmstadt,
> Germany, very well. The Milky Way is invisible here completely. Now I
> found a database of 120.00 stars published by the European Space Agency
> (Hipparcos-Catalogue). So the next experiment is to try to understand
> this data and to project them at my sky-sphere.
>
> Best regards
> Michael

Cousin Ricky has you covered:

https://news.povray.org/povray.object-collection/thread/%3Cweb.5a7fae1be3b4c4165cafe28e0@news.povray.org%3E/


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From: Cousin Ricky
Subject: Re: First play with Blender physics
Date: 22 Aug 2022 09:36:40
Message: <63038668$1@news.povray.org>
On 2022-08-21 15:15 (-4), Bald Eagle wrote:
> MichaelJF <fri### [at] t-onlinede> wrote:
> 
>>  Now I
>> found a database of 120.00 stars published by the European Space Agency
>> (Hipparcos-Catalogue). So the next experiment is to try to understand
>> this data and to project them at my sky-sphere.

Although I'm rather leary of the stellar distances in that catalog, that
shouldn't make any difference for your present purpose.

> Cousin Ricky has you covered:
> 
>
https://news.povray.org/povray.object-collection/thread/%3Cweb.5a7fae1be3b4c4165cafe28e0@news.povray.org%3E/

The URL in that thread is still down.  In the meantime, the module is
available at:
  https://github.com/CousinRicky/POV-BrightStar5

There is some discussion of projection in that thread.


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From: MichaelJF
Subject: Re: First play with Blender physics
Date: 22 Aug 2022 12:10:05
Message: <6303aa5d@news.povray.org>
Am 22.08.2022 um 15:36 schrieb Cousin Ricky:
> On 2022-08-21 15:15 (-4), Bald Eagle wrote:
>> MichaelJF <fri### [at] t-onlinede> wrote:
>>
>>>   Now I
>>> found a database of 120.00 stars published by the European Space Agency
>>> (Hipparcos-Catalogue). So the next experiment is to try to understand
>>> this data and to project them at my sky-sphere.
> 
> Although I'm rather leary of the stellar distances in that catalog, that
> shouldn't make any difference for your present purpose.
> 
>> Cousin Ricky has you covered:
>>
>>
https://news.povray.org/povray.object-collection/thread/%3Cweb.5a7fae1be3b4c4165cafe28e0@news.povray.org%3E/
> 
> The URL in that thread is still down.  In the meantime, the module is
> available at:
>    https://github.com/CousinRicky/POV-BrightStar5
> 
> There is some discussion of projection in that thread.
Many thanks to you and Bald Eagle, I was not aware of it because I 
didn't look into all POV newsgroups regularly. I just downloaded the 
files from github and will take a close look within the next days.

If someone is interested: The hipparcos data can be found at

https://cdsarc.cds.unistra.fr/viz-bin/cat/I/311#/browse

FTP-Tab, hip2.dat.gz

For my image I need declination, right ascension and magnitude. But I 
wonder about the colour index and if this can be of use.

Best regards
Michael


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