POV-Ray : Newsgroups : povray.binaries.images : An isosurface cloud. Server Time: 27 Sep 2020 20:17:05 GMT
  An isosurface cloud. (Message 1 to 6 of 6)  
From: William F Pokorny
Subject: An isosurface cloud.
Date: 16 Aug 2020 18:29:06
Message: <5f397af2$1@news.povray.org>
Using several povr features, tried my hand at rendering an isosurface 
cloud this afternoon. Like media, it takes some twiddling. Using +am1 
+a0.0 +r9 to force a large amount of sampling, one light for the sun and 
radiosity it took about 30 minutes on my two core, four thread i3.

How many shapes - bazillions :-).

Bill P.


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Attachments:
Download 'isoclouds3.jpg' (34 KB)

Preview of image 'isoclouds3.jpg'
isoclouds3.jpg


 

From: BayashiPascal
Subject: Re: An isosurface cloud.
Date: 18 Aug 2020 10:25:00
Message: <web.5f3bab97edbf6451e1c5b0040@news.povray.org>
After Thomas' splines in isosurfaces, they are quite popular nowadays ! ;-)

Your cloud looks more like smoke to me but the idea is very interesting. Thanks
for sharing.


Pascal



William F Pokorny <ano### [at] anonymousorg> wrote:
> Using several povr features, tried my hand at rendering an isosurface
> cloud this afternoon. Like media, it takes some twiddling. Using +am1
> +a0.0 +r9 to force a large amount of sampling, one light for the sun and
> radiosity it took about 30 minutes on my two core, four thread i3.
>
> How many shapes - bazillions :-).
>
> Bill P.


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From: William F Pokorny
Subject: Re: An isosurface cloud.
Date: 19 Aug 2020 12:20:19
Message: <5f3d1903$1@news.povray.org>
On 8/18/20 6:21 AM, BayashiPascal wrote:
> After Thomas' splines in isosurfaces, they are quite popular nowadays ! ;-)
> 
Yes, with povr been trying to remove some of the longstanding code 
issues and functional limitations. We'll see.

> Your cloud looks more like smoke to me but the idea is very interesting. Thanks
> for sharing.
> 

Yes, think you are right. The core issue is similar to what Kima has 
been asking about with color depth and banding. With isosurfaces, even 
forcing a lot of rays to be shot, you always have discrete shapes / 
grains at locations, unlike a media density of some kind. The isosurface 
jitter feature of povr helps a little with this, but it currently 
jitters only 'within' the accuracy amount.

If I apply some gaussian blurring with POV-Ray or external tool, I get 
something looking more cloud like, but not quite right on the fuzzy 
side. I could too probably help the cloud look by using some overall 
haze, but for this I wanted to better see the cloud structure. To 
explore / push the technique some.

I'll attach another variant where I cranked down on the gradient and 
accuracy while adding a second much smaller violent turbulence. To my 
eye less cloud like still, but interesting too. Not really sure what it 
looks like... Fuzzy fabric?

Aside: I reworked the fog feature in povr. Everything with it is depth 
based, but I have this rough idea forming in my head we might be able to 
do something interesting combining fog with isosurfaces of the fuzzy 
kind - maybe where some are all of the fuzzy shapes are transparent. 
Anyway, an idea for another day.

Bill P.


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Attachments:
Download 'isoclouds4.jpg' (158 KB)

Preview of image 'isoclouds4.jpg'
isoclouds4.jpg


 

From: Thomas de Groot
Subject: Re: An isosurface cloud.
Date: 20 Aug 2020 06:25:34
Message: <5f3e175e$1@news.povray.org>
Op 19/08/2020 om 14:20 schreef William F Pokorny:
> On 8/18/20 6:21 AM, BayashiPascal wrote:
>> After Thomas' splines in isosurfaces, they are quite popular nowadays 
>> ! ;-)
>>
> Yes, with povr been trying to remove some of the longstanding code 
> issues and functional limitations. We'll see.
> 
>> Your cloud looks more like smoke to me but the idea is very 
>> interesting. Thanks
>> for sharing.
>>
> 
> Yes, think you are right. The core issue is similar to what Kima has 
> been asking about with color depth and banding. With isosurfaces, even 
> forcing a lot of rays to be shot, you always have discrete shapes / 
> grains at locations, unlike a media density of some kind. The isosurface 
> jitter feature of povr helps a little with this, but it currently 
> jitters only 'within' the accuracy amount.
> 
> If I apply some gaussian blurring with POV-Ray or external tool, I get 
> something looking more cloud like, but not quite right on the fuzzy 
> side. I could too probably help the cloud look by using some overall 
> haze, but for this I wanted to better see the cloud structure. To 
> explore / push the technique some.
> 
> I'll attach another variant where I cranked down on the gradient and 
> accuracy while adding a second much smaller violent turbulence. To my 
> eye less cloud like still, but interesting too. Not really sure what it 
> looks like... Fuzzy fabric?
> 
> Aside: I reworked the fog feature in povr. Everything with it is depth 
> based, but I have this rough idea forming in my head we might be able to 
> do something interesting combining fog with isosurfaces of the fuzzy 
> kind - maybe where some are all of the fuzzy shapes are transparent. 
> Anyway, an idea for another day.
> 
> Bill P.
> 

Interesting work! not really cloud-like perhaps, and second one looks 
very much like a soft fluffy pillow, but this could lead to many uses.

Intrigued by your fog ideas by the way... reminds me of the ghostly 
df3-with-media experiments from a couple of years ago.

-- 
Thomas


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From: Kenneth
Subject: Re: An isosurface cloud.
Date: 2 Sep 2020 18:25:01
Message: <web.5f4fe28fedbf6451d98418910@news.povray.org>
William F Pokorny <ano### [at] anonymousorg> wrote:
> Using several povr features, tried my hand at rendering an isosurface
> cloud this afternoon. Like media, it takes some twiddling...
>
> How many shapes - bazillions :-).
>

I really like your first image; it reminds me of the 'whimsical clouds' in the
live-action movie version of HOW THE GRINCH STOLE CHRISTMAS (with Jim Carrey). I
have no idea how you achieved the fuzzy media-like look, using an isosurface,
but it looks great.


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From: William F Pokorny
Subject: Re: An isosurface cloud.
Date: 10 Sep 2020 16:23:47
Message: <5f5a5313$1@news.povray.org>
On 9/2/20 2:21 PM, Kenneth wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
...
> 
> I really like your first image; it reminds me of the 'whimsical clouds' in the
> live-action movie version of HOW THE GRINCH STOLE CHRISTMAS (with Jim Carrey). I
> have no idea how you achieved the fuzzy media-like look, using an isosurface,
> but it looks great.
> 

Thank you.

Bill P.


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