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2 Oct 2022 19:48:56 EDT (-0400)
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From: MichaelJF
Subject: First play with Blender physics
Date: 12 Aug 2022 13:16:07
Message: <62f68ad7@news.povray.org>
Since I never managed to get Kopi's bullet physics running I noticed 
that all this physics and a lot more are implemented into Blender 
nowadays. So I simulated a fountain with the Mantaflow compontent. The 
result is suboptimal, but I like it anyway. I played a lot with all the 
parameters, but that is the best I could squeeze out of Blender. I think 
the Mantaflow component of Blender is not really designed for this kind 
of simulation. As I understand it, it is designed for cohesive flows of 
water and can be very realistic in such situations. There is another 
approach of particle system implemented in Blender where the drops are 
independend objects and can influence each other. May be I will play 
with this one too sometimes in the future.

Here is my Mantaflow experiment, placed into an inspiration given by an 
abbey I visited recently.

Best regards
Michael

P.S.: Credits go to Thomas de Groot and Genady Obukhov (tileroof), 
Christoph Hormann (Iso-CSG-Library). Sean Day and Robert McGregor (some 
textures I modified), Gilles Tran (grass), and Xfrog, I used to model 
the crude models of a weeping willow, a shrub of roses and an even more 
crude model of clover.


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From: Cousin Ricky
Subject: Re: First play with Blender physics
Date: 13 Aug 2022 09:57:48
Message: <62f7addc$1@news.povray.org>
On 2022-08-12 13:16 (-4), MichaelJF wrote:
> 
> P.S.: Credits go to Thomas de Groot and Genady Obukhov (tileroof),
> Christoph Hormann (Iso-CSG-Library). Sean Day and Robert McGregor (some
> textures I modified), Gilles Tran (grass), and Xfrog, I used to model
> the crude models of a weeping willow, a shrub of roses and an even more
> crude model of clover.

The willow is really nice!


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From: Thomas de Groot
Subject: Re: First play with Blender physics
Date: 13 Aug 2022 10:41:50
Message: <62f7b82e$1@news.povray.org>
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/

-- 
Thomas


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From: MichaelJF
Subject: Re: First play with Blender physics
Date: 13 Aug 2022 12:52:16
Message: <62f7d6c0$1@news.povray.org>
Am 13.08.2022 um 15:57 schrieb Cousin Ricky:
> On 2022-08-12 13:16 (-4), MichaelJF wrote:
>>
>> P.S.: Credits go to Thomas de Groot and Genady Obukhov (tileroof),
>> Christoph Hormann (Iso-CSG-Library). Sean Day and Robert McGregor (some
>> textures I modified), Gilles Tran (grass), and Xfrog, I used to model
>> the crude models of a weeping willow, a shrub of roses and an even more
>> crude model of clover.
> 
> The willow is really nice!

Many thanks for the compliment. It took a while to understand Xfrog so 
far to model such a complex tree. And it was not easy to move it to POV. 
Of course, the original Xfrog-File saves the Xfrog parameters only. Only 
46 KB are needed to save the complete tree. Exported to wavefront OBJ it 
had some 0.5 GB and more than 350.000 groups for every single leaf. 
PoseRay failed to convert this huge amount of data to POV within 
acceptable time. So I wrote an own procedure using my professional 
statistic software which can cope with mass data easily (www.sas.com). 
Even compressed the POV code of the tree needs some 50 MB, so I cannot 
share it here.

@Thomas: Of course I know the arbaro weeping willow. For example, I used 
it in my entry "The secret pond" in the competition "The secret passage" 
(TINA CHEP, September 2014) at the very left side of the image. But I 
didn't accomplished the modifications I wanted in Arbaro.

Best regards
Michael


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From: Thomas de Groot
Subject: Re: First play with Blender physics
Date: 14 Aug 2022 02:23:05
Message: <62f894c9$1@news.povray.org>
Op 13/08/2022 om 18:52 schreef MichaelJF:
> @Thomas: Of course I know the arbaro weeping willow. For example, I used 
> it in my entry "The secret pond" in the competition "The secret passage" 
> (TINA CHEP, September 2014) at the very left side of the image. But I 
> didn't accomplished the modifications I wanted in Arbaro.
> 
Yes, I guessed so, but one never knows ;-)

Good trees are a real challenge.

-- 
Thomas


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From: Thomas de Groot
Subject: Re: First play with Blender physics
Date: 18 Aug 2022 02:33:37
Message: <62fddd41$1@news.povray.org>
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... ;-)

-- 
Thomas


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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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