POV-Ray : Newsgroups : povray.general : SSLT? Server Time
26 Nov 2024 16:27:42 EST (-0500)
  SSLT? (Message 1 to 7 of 7)  
From: Jim Holsenback
Subject: SSLT?
Date: 27 May 2010 06:52:51
Message: <4bfe4f03$1@news.povray.org>
Trying to determine placement for SSLT entry in docs.

Ref->Textures->Finish is obvious but since SSLT is just another type of
diffuse (correct?) should it be:

Ref->Textures->Finish->Diffuse Reflection Items->SSLT

or

Ref->Textures->Finish->Diffuse Reflection Items->Diffuse->SSLT


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From: clipka
Subject: Re: SSLT?
Date: 27 May 2010 09:36:24
Message: <4bfe7558@news.povray.org>
Am 27.05.2010 12:55, schrieb Jim Holsenback:
> Trying to determine placement for SSLT entry in docs.
>
> Ref->Textures->Finish is obvious but since SSLT is just another type of
> diffuse (correct?) should it be:
>
> Ref->Textures->Finish->Diffuse Reflection Items->SSLT
>
> or
>
> Ref->Textures->Finish->Diffuse Reflection Items->Diffuse->SSLT

I suggest to not put it in the official documentation yet. There /will/ 
be changes to the syntax - it may even end up in the interior.


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From: Alain
Subject: Re: SSLT?
Date: 27 May 2010 12:14:30
Message: <4bfe9a66$1@news.povray.org>

> Am 27.05.2010 12:55, schrieb Jim Holsenback:
>> Trying to determine placement for SSLT entry in docs.
>>
>> Ref->Textures->Finish is obvious but since SSLT is just another type of
>> diffuse (correct?) should it be:
>>
>> Ref->Textures->Finish->Diffuse Reflection Items->SSLT
>>
>> or
>>
>> Ref->Textures->Finish->Diffuse Reflection Items->Diffuse->SSLT
>
> I suggest to not put it in the official documentation yet. There /will/
> be changes to the syntax - it may even end up in the interior.

At least, label it as a beta, still in devlopment, feature. Also, 
inforce the idea that the syntax and location are subject to future changes.


Alain


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From: Jim Holsenback
Subject: Re: SSLT?
Date: 27 May 2010 13:53:48
Message: <4bfeb1ac$1@news.povray.org>
On 05/27/2010 01:14 PM, Alain wrote:
> At least, label it as a beta, still in devlopment, feature. Also,
> inforce the idea that the syntax and location are subject to future
> changes.

That's what I did:
http://wiki.povray.org/content/Documentation:Reference_Section_5.1#Subsurface_Light_Transport

Jim


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From: Jim Holsenback
Subject: Re: SSLT?
Date: 27 May 2010 14:15:53
Message: <4bfeb6d9@news.povray.org>
On 05/27/2010 02:56 PM, Jim Holsenback wrote:
> On 05/27/2010 01:14 PM, Alain wrote:
>> At least, label it as a beta, still in devlopment, feature. Also,
>> inforce the idea that the syntax and location are subject to future
>> changes.
> 
> That's what I did:
>
http://wiki.povray.org/content/Documentation:Reference_Section_5.1#Subsurface_Light_Transport

oh yeah ... found this while I was working on sslt entry, and thought
some of you might find it useful:
http://graphics.stanford.edu/papers/bssrdf/

a tough read (pdf link at bottom of page) but I slogged through it ;-)


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From: clipka
Subject: Re: SSLT?
Date: 27 May 2010 16:32:00
Message: <4bfed6c0$1@news.povray.org>
Am 27.05.2010 20:18, schrieb Jim Holsenback:

> oh yeah ... found this while I was working on sslt entry, and thought
> some of you might find it useful:
> http://graphics.stanford.edu/papers/bssrdf/
>
> a tough read (pdf link at bottom of page) but I slogged through it ;-)

... which, by the way, is exactly the paper the implementation in 
POV-Ray is primarily based upon :-) (Well, that, and some earlier 
POV-Ray 3.6 patch - by Sarah Tariq and Lawrence (Lorenzo) Ibarria - 
which appeared to be based on that very same paper as well, but was 
found wanting in various respects.)

There is also some follow-up paper by the same Henrik Wann Jensen (and 
some Juan Buhler) called "A Rapid Hierarchical Rendering Technique for 
Translucent Materials" (don't know a link, but it's out there as a PDF 
somewhere), which provided some inspiration for planned improvements.


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From: Jim Holsenback
Subject: Re: SSLT?
Date: 27 May 2010 17:21:35
Message: <4bfee25f@news.povray.org>
On 05/27/2010 05:31 PM, clipka wrote:

> "A Rapid Hierarchical Rendering Technique for
> Translucent Materials" (don't know a link, but it's out there as a PDF
> somewhere), which provided some inspiration for planned improvements.

http://graphics.ucsd.edu/~henrik/papers/fast_bssrdf/


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