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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