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28 Mar 2024 11:45:16 EDT (-0400)
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From: Thomas de Groot
Subject: Re: Object inside opaque media
Date: 12 Nov 2018 06:47:08
Message: <5be9683c$1@news.povray.org>
On 12-11-2018 9:04, dick balaska wrote:
> On 11/11/18 12:40 PM, Thomas de Groot wrote:
>> On 9-11-2018 9:05, Thomas de Groot wrote:
>>> See povray.general for discussion. Same subject title.
>>>
>>
>> My second test. With cloud layer.
>>
> 
> Oh boy! Another planet for my space scene. :)
> 

Watch out for mega storms though.  :-)

-- 
Thomas


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From: Thomas de Groot
Subject: Re: Object inside opaque media
Date: 12 Nov 2018 06:47:59
Message: <5be9686f$1@news.povray.org>
On 12-11-2018 11:05, Paolo Gibellini wrote:
> Thomas de Groot wrote on 11/11/2018 18:40:
>> On 9-11-2018 9:05, Thomas de Groot wrote:
>>> See povray.general for discussion. Same subject title.
>>>
>>
>> My second test. With cloud layer.
>>
> Very very nice!
> Paolo

Crude work, but yes, I rather like it myself :-)

-- 
Thomas


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From: Jörg "Yadgar" Bleimann
Subject: Re: Object inside opaque media
Date: 13 Nov 2018 13:10:56
Message: <5beb13b0$1@news.povray.org>
Hi(gh)!

On 11.11.2018 18:40, Thomas de Groot wrote:
> On 9-11-2018 9:05, Thomas de Groot wrote:
>> See povray.general for discussion. Same subject title.
>>
> 
> My second test. With cloud layer.
> 

This isn't to become Titan, is it?

See you in Khyberspace!

Yadgar


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From: Kenneth
Subject: Re: Object inside opaque media
Date: 13 Nov 2018 14:30:01
Message: <web.5beb250fddef308a43b397d0@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:

>
> My second test. With cloud layer.
>

Both images are really nice. Great work.


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From: jr
Subject: Re: Object inside opaque media
Date: 13 Nov 2018 14:30:01
Message: <web.5beb25b4ddef308a6427f7f90@news.povray.org>
hi,

=?UTF-8?Q?J=c3=b6rg_=22Yadgar=22_Bleimann?= <yaz### [at] gmxde> wrote:
> On 11.11.2018 18:40, Thomas de Groot wrote:
> > On 9-11-2018 9:05, Thomas de Groot wrote:
> >> See povray.general for discussion. Same subject title.
> >>
> > My second test. With cloud layer.

beautiful.

> This isn't to become Titan, is it?
> Yadgar

heh, you beat me to it.  except, I was thinking a hint more red and Mars.  :-)


regards, jr.


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From: Jörg "Yadgar" Bleimann
Subject: Re: Object inside opaque media
Date: 13 Nov 2018 20:38:57
Message: <5beb7cb1$1@news.povray.org>
Hi(gh)!

On 13.11.2018 20:27, jr wrote:

> heh, you beat me to it.  except, I was thinking a hint more red and Mars.  :-)

For Mars, the atmosphere is much too thick!

See you in Khyberspace!

Yadgar


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From: Thomas de Groot
Subject: Re: Object inside opaque media
Date: 14 Nov 2018 02:46:35
Message: <5bebd2db$1@news.povray.org>

> Hi(gh)!
> 
> On 13.11.2018 20:27, jr wrote:
> 


> 
> For Mars, the atmosphere is much too thick!
> 
> See you in Khyberspace!
> 
> Yadgar

Not Mars, nor Titan. Just a logical step further from the original test 
file by Shuffle in povray.general. It is crude and would need more work 
(some latitudinal banding for instance) but that is not the point presently.

I would like to note that I use isotropic scattering (type 1) for both 
atmosphere and clouds. In the original code Shuffle used the 
Henyey-Greenstein scattering model with a slight excentricity. I think 
this use is only relevant when the camera is /inside/ the fog/cloud, 
especially the excentricity. Outside, scattering type 1 (isotropic is 
just as good and possibly faster. Think of being inside a fog bank and 
seeing the Sun poke through, or being on a mountain side and look at a 
fog bank from above.

In any case, the scene files is available in povray.general.

-- 
Thomas


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From: Thomas de Groot
Subject: Re: Object inside opaque media
Date: 14 Nov 2018 02:49:42
Message: <5bebd396$1@news.povray.org>
On 13-11-2018 20:25, Kenneth wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>>
>> My second test. With cloud layer.
>>
> 
> Both images are really nice. Great work.
> 
> 

Thanks! Possibly not entirely useful for the particular use of Shuffle 
but certainly a basis for further investigation. The use within an 
animation would be a challenge. However, that is discussed in 
povray.general ;-)

-- 
Thomas


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From: clipka
Subject: Re: Object inside opaque media
Date: 14 Nov 2018 03:19:02
Message: <5bebda76$1@news.povray.org>
Am 14.11.2018 um 08:46 schrieb Thomas de Groot:

> especially the excentricity. Outside, scattering type 1 (isotropic is 
> just as good and possibly faster. Think of being inside a fog bank and 

I don't think scattering type has much effect on speed; it doesn't 
really change the algorithm, just a weighting function.


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From: Thomas de Groot
Subject: Re: Object inside opaque media
Date: 14 Nov 2018 06:57:31
Message: <5bec0dab$1@news.povray.org>
On 14-11-2018 9:19, clipka wrote:
> Am 14.11.2018 um 08:46 schrieb Thomas de Groot:
> 
>> especially the excentricity. Outside, scattering type 1 (isotropic is 
>> just as good and possibly faster. Think of being inside a fog bank and 
> 
> I don't think scattering type has much effect on speed; it doesn't 
> really change the algorithm, just a weighting function.

OK. I was not sure and thought it would make some difference, but I 
never tested that of course. :-)

-- 
Thomas


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