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From: Sven Littkowski
Subject: Cloud Surface
Date: 24 Nov 2017 07:43:37
Message: <5a17cda9$1@news.povray.org>
Hi,

a question: is there any public source code that allows us to create
cloudy surfaces like that one in the attached photo? I want to do
something that I never did before: building cloud cities!


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Attachments:
Download 'cloud city.jpg' (50 KB)

Preview of image 'cloud city.jpg'
cloud city.jpg


 

From: And
Subject: Re: Cloud Surface
Date: 24 Nov 2017 13:40:00
Message: <web.5a181ff99a2a53c1a6394f050@news.povray.org>
Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
> Hi,
>
> a question: is there any public source code that allows us to create
> cloudy surfaces like that one in the attached photo? I want to do
> something that I never did before: building cloud cities!
>
>
> ---
> Diese E-Mail wurde von AVG auf Viren geprüft.
> http://www.avg.com

Maybe it can be drawn by media(povray) to some extent. Cycles renderer of
blender should renders better because its volume rendering contains multiple
scattering calculations.
For a thin media like atmosphere, single scattering is in the majority, so
the media of Povray can simulate well. But cloud is heavy media, light
passing through it can scatter many times, most of the luminance from a cloud
is from the multiple scattering.

If you want to draw a cloud in PovRay, maybe scattering media + emission media
can do it, Or ... ?
Or subsurface scattering material, this feature of Povray calculate both single
scattering and multiple scattering in the substance, but scattering density of
the material is limited to constant.


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From: clipka
Subject: Re: Cloud Surface
Date: 24 Nov 2017 15:38:03
Message: <5a183cdb$1@news.povray.org>
Am 24.11.2017 um 14:37 schrieb And:
> Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
>> Hi,
>>
>> a question: is there any public source code that allows us to create
>> cloudy surfaces like that one in the attached photo? I want to do
>> something that I never did before: building cloud cities!
>>
>>
>> ---
>> Diese E-Mail wurde von AVG auf Viren geprüft.
>> http://www.avg.com
> 
> Maybe it can be drawn by media(povray) to some extent. Cycles renderer of
> blender should renders better because its volume rendering contains multiple
> scattering calculations.
> For a thin media like atmosphere, single scattering is in the majority, so
> the media of Povray can simulate well. But cloud is heavy media, light
> passing through it can scatter many times, most of the luminance from a cloud
> is from the multiple scattering.
> 
> If you want to draw a cloud in PovRay, maybe scattering media + emission media
> can do it, Or ... ?
> Or subsurface scattering material, this feature of Povray calculate both single
> scattering and multiple scattering in the substance, but scattering density of
> the material is limited to constant.

I doubt whether subsurface scattering can be employed to do the trick;
you probably won't get the same "fluffyness".


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From: Kontemplator
Subject: Re: Cloud Surface
Date: 24 Nov 2017 19:10:00
Message: <web.5a186dbd9a2a53c19ae32810@news.povray.org>
Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
> Hi,
>
> a question: is there any public source code that allows us to create
> cloudy surfaces like that one in the attached photo? I want to do
> something that I never did before: building cloud cities!
>
>
> ---
> Diese E-Mail wurde von AVG auf Viren geprüft.
> http://www.avg.com

Here is a little example scene for a cloud surface. Not the level like in your
picture but it's something you can start with.

http://news.povray.org/povray.text.scene-files/message/%3Cweb.5a186b419a2a53c19ae32810%40

image:

http://news.povray.org/povray.binaries.images/message/%3Cweb.5a186c9e9a2a53c19ae32810%40


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From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 24 Nov 2017 19:57:43
Message: <5a1879b7$1@news.povray.org>
On 24.11.2017 14:06, Kontemplator wrote:
> Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
>> Hi,
>>
>> a question: is there any public source code that allows us to create
>> cloudy surfaces like that one in the attached photo? I want to do
>> something that I never did before: building cloud cities!
>>
>>
>> ---
>> Diese E-Mail wurde von AVG auf Viren geprüft.
>> http://www.avg.com
> 
> Here is a little example scene for a cloud surface. Not the level like in your
> picture but it's something you can start with.
> 
>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5a186b419a2a53c19ae32810%40
> 
> image:
> 
>
http://news.povray.org/povray.binaries.images/message/%3Cweb.5a186c9e9a2a53c19ae32810%40
> 
> 
> 
Yes, I think I can use those clouds. But I need to get that surface
following the round surface shape of a planet, is that possible?

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From: Alain
Subject: Re: Cloud Surface
Date: 25 Nov 2017 02:21:06
Message: <5a18d392$1@news.povray.org>
Le 17-11-24 à 14:57, Sven Littkowski a écrit :
> On 24.11.2017 14:06, Kontemplator wrote:
>> Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
>>> Hi,
>>>
>>> a question: is there any public source code that allows us to create
>>> cloudy surfaces like that one in the attached photo? I want to do
>>> something that I never did before: building cloud cities!
>>>
>>>
>>> ---
>>> Diese E-Mail wurde von AVG auf Viren geprüft.
>>> http://www.avg.com
>>
>> Here is a little example scene for a cloud surface. Not the level like in your
>> picture but it's something you can start with.
>>
>>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5a186b419a2a53c19ae32810%40
>>
>> image:
>>
>>
http://news.povray.org/povray.binaries.images/message/%3Cweb.5a186c9e9a2a53c19ae32810%40
>>
>>
>>
> Yes, I think I can use those clouds. But I need to get that surface
> following the round surface shape of a planet, is that possible?
> 
> ---
> Diese E-Mail wurde von AVG auf Viren geprüft.
> http://www.avg.com
> 

Yes. The onion and spherical patterns come to mind.
In your case, I think that onion with a colour_map going from high to 
low would be better as you don't need to scale it as much : You can only 
take the 10000th repetition
  of the pattern if you want.
Next, add some turbulence, possibly adding some other pattern(s).

Don't forget to make your media sufficiently dense.


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From: And
Subject: Re: Cloud Surface
Date: 25 Nov 2017 04:30:00
Message: <web.5a18f1a39a2a53c1a6394f050@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 24.11.2017 um 14:37 schrieb And:
> > Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
> >> Hi,
> >>
> >> a question: is there any public source code that allows us to create
> >> cloudy surfaces like that one in the attached photo? I want to do
> >> something that I never did before: building cloud cities!
> >>
> >>
> >> ---
> >> Diese E-Mail wurde von AVG auf Viren geprüft.
> >> http://www.avg.com
> >
> > Maybe it can be drawn by media(povray) to some extent. Cycles renderer of
> > blender should renders better because its volume rendering contains multiple
> > scattering calculations.
> > For a thin media like atmosphere, single scattering is in the majority, so
> > the media of Povray can simulate well. But cloud is heavy media, light
> > passing through it can scatter many times, most of the luminance from a cloud
> > is from the multiple scattering.
> >
> > If you want to draw a cloud in PovRay, maybe scattering media + emission media
> > can do it, Or ... ?
> > Or subsurface scattering material, this feature of Povray calculate both single
> > scattering and multiple scattering in the substance, but scattering density of
> > the material is limited to constant.
>
> I doubt whether subsurface scattering can be employed to do the trick;
> you probably won't get the same "fluffyness".

Maybe that is partially due to uniform scattering density in a object. However,
I do a test on this, post image here:

http://news.povray.org/povray.binaries.images/thread/%3Cweb.5a186c9e9a2a53c19ae32810%40news.povray.org%3E/?mtop=418940&
moff=10


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From: And
Subject: Re: Cloud Surface
Date: 25 Nov 2017 08:00:00
Message: <web.5a19217d9a2a53c1a6394f050@news.povray.org>
"And" <49341109@ntnu.edu.tw> wrote:
> Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
> > Hi,
> >
> > a question: is there any public source code that allows us to create
> > cloudy surfaces like that one in the attached photo? I want to do
> > something that I never did before: building cloud cities!
> >
> >
> > ---
> > Diese E-Mail wurde von AVG auf Viren geprüft.
> > http://www.avg.com
>
> Maybe it can be drawn by media(povray) to some extent. Cycles renderer of
> blender should renders better because its volume rendering contains multiple
> scattering calculations.
> For a thin media like atmosphere, single scattering is in the majority, so
> the media of Povray can simulate well. But cloud is heavy media, light
> passing through it can scatter many times, most of the luminance from a cloud
> is from the multiple scattering.
>
> If you want to draw a cloud in PovRay, maybe scattering media + emission media
> can do it, Or ... ?
> Or subsurface scattering material, this feature of Povray calculate both single
> scattering and multiple scattering in the substance, but scattering density of
> the material is limited to constant.


I uploaded two images:
http://news.povray.org/povray.binaries.images/message/%3Cweb.5a1917549a2a53c1a6394f050%40news.povray.org%3E/#%3Cweb.5a1
917549a2a53c1a6394f050%40news.povray.org%3E

and
http://news.povray.org/povray.binaries.images/message/%3Cweb.5a191dbf9a2a53c1a6394f050%40news.povray.org%3E/#%3Cweb.5a1
91dbf9a2a53c1a6394f050%40news.povray.org%3E


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From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 25 Nov 2017 19:28:51
Message: <5a19c473$1@news.povray.org>
On 25.11.2017 02:53, And wrote:
> I uploaded two images:
> http://news.povray.org/povray.binaries.images/message/%3Cweb.5a1917549a2a
53c1a6394f050%40news.povray.org%3E/#%3Cweb.5a1
> 917549a2a53c1a6394f050%40news.povray.org%3E
> and
> http://news.povray.org/povray.binaries.images/message/%3Cweb.5a191dbf9a2a
53c1a6394f050%40news.povray.org%3E/#%3Cweb.5a1
> 91dbf9a2a53c1a6394f050%40news.povray.org%3E

Yes, I saw them. I actually responded to the IMAGES group thread. :-)

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From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 26 Nov 2017 03:27:42
Message: <5a1a34ae$1@news.povray.org>
Is there a German offline HELP file for POV-Ray? The English version is,
due to its many English special terms, not so easy for me to understand.

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