POV-Ray : Newsgroups : povray.binaries.scene-files : faked translucency mapping Server Time: 13 Aug 2020 20:05:57 GMT
  faked translucency mapping (Message 1 to 5 of 5)  
From: Norbert Kern
Subject: faked translucency mapping
Date: 24 Apr 2020 19:10:01
Message: <web.5ea338c250f682f2afdd13e10@news.povray.org>
Povray doesn't support translucency mapping :-(

Here is a small workaround...
See this thread -
http://news.povray.org/povray.binaries.images/message/%3Cweb.5ea334191a336268afdd13e10%40news.povray.org%3E/#%3Cweb.5ea
334191a336268afdd13e10%40news.povray.org%3E
..

Norbert


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Attachments:
Download 'faked translucency mapping.zip' (1321 KB)

From: Thomas de Groot
Subject: Re: faked translucency mapping
Date: 25 Apr 2020 07:17:25
Message: <5ea3e405@news.povray.org>
Op 24/04/2020 om 21:06 schreef Norbert Kern:
> Povray doesn't support translucency mapping :-(
> 
> Here is a small workaround...
> See this thread -
>
http://news.povray.org/povray.binaries.images/message/%3Cweb.5ea334191a336268afdd13e10%40news.povray.org%3E/#%3Cweb.5ea
> 334191a336268afdd13e10%40news.povray.org%3E
> ..
> 
> Norbert
> 

Smart. Put it on my (depressingly long) ToDo list. Thanks!!

-- 
Thomas


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From: Thomas de Groot
Subject: Re: faked translucency mapping
Date: 29 May 2020 07:02:17
Message: <5ed0b379$1@news.povray.org>
Op 24/04/2020 om 21:06 schreef Norbert Kern:
> Povray doesn't support translucency mapping :-(
> 

OK. So I studied your code which - as always - is brilliant for its 
simple and smart solution. I wonder how you came to think of this?

One question: leaf_tl was generated by you, I suppose. I can see a 
number of ways to do this, in particular by combining leaf_b and leaf_c 
(The inversed twig of leaf_a is added of course) in a smart way in GIMP 
for instance, or by simply tonemapping in GIMP.

In any case, there is some work to do next time I need a tree! :-)

Thanks for sharing! Keep corona-free!

-- 
Thomas


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From: Norbert Kern
Subject: Re: faked translucency mapping
Date: 29 May 2020 21:25:05
Message: <web.5ed17cdbe407a14fafdd13e10@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 24/04/2020 om 21:06 schreef Norbert Kern:
> > Povray doesn't support translucency mapping :-(
> >
>
> OK. So I studied your code which - as always - is brilliant for its
> simple and smart solution. I wonder how you came to think of this?
>
> One question: leaf_tl was generated by you, I suppose. I can see a
> number of ways to do this, in particular by combining leaf_b and leaf_c
> (The inversed twig of leaf_a is added of course) in a smart way in GIMP
> for instance, or by simply tonemapping in GIMP.
>
> In any case, there is some work to do next time I need a tree! :-)
>
> Thanks for sharing! Keep corona-free!
>
> --
> Thomas




Hi Thomas,
here it was the "easy way" to get a fitting tl_map - photoshop...

Of course I tried other ways to "automate" it, but The real cause of not further
investigating it further was - it was slow.
In the end I used a partial render of the big oak at the middle left, because
render speed was only a fifth.

The real use of the fake is for more intimate scenes with single usage - at
least until we get a real implementation of translucency maps and all the other
types of texture maps swirling around DAZ studio - roughness, normal, ao-maps
and so on...


......
Personally I don't fear corona anymore, because my family had an obsure severe
illness back in march/april - and I never was a hypochondriac. I'll invest in
antibody tests, when they are available at a reasonable price.

Norbert

and Keep corona-free!


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From: Thomas de Groot
Subject: Re: faked translucency mapping
Date: 30 May 2020 06:29:12
Message: <5ed1fd38$1@news.povray.org>
Op 29/05/2020 om 23:23 schreef Norbert Kern:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 24/04/2020 om 21:06 schreef Norbert Kern:
>>> Povray doesn't support translucency mapping :-(
>>>
>>
>> OK. So I studied your code which - as always - is brilliant for its
>> simple and smart solution. I wonder how you came to think of this?
>>
>> One question: leaf_tl was generated by you, I suppose. I can see a
>> number of ways to do this, in particular by combining leaf_b and leaf_c
>> (The inversed twig of leaf_a is added of course) in a smart way in GIMP
>> for instance, or by simply tonemapping in GIMP.
>>
>> In any case, there is some work to do next time I need a tree! :-)
>>
>> Thanks for sharing! Keep corona-free!
>>
>> --
>> Thomas
> 
> 
> 
> 
> Hi Thomas,
> here it was the "easy way" to get a fitting tl_map - photoshop...
> 
> Of course I tried other ways to "automate" it, but The real cause of not further
> investigating it further was - it was slow.
> In the end I used a partial render of the big oak at the middle left, because
> render speed was only a fifth.
> 
> The real use of the fake is for more intimate scenes with single usage - at
> least until we get a real implementation of translucency maps and all the other
> types of texture maps swirling around DAZ studio - roughness, normal, ao-maps
> and so on...
> 
> 
> ......
> Personally I don't fear corona anymore, because my family had an obsure severe
> illness back in march/april - and I never was a hypochondriac. I'll invest in
> antibody tests, when they are available at a reasonable price.
> 
> Norbert
> 
> and Keep corona-free!
> 

Thanks for your info. After I posted my message I thought of all kind of 
problems possibly linked to the trick. Indeed, I agree that we /really/ 
need a translucency map full implementation. Still, it is neat.

I am living in an area of the country with relatively few corona cases. 
We are careful, but not really worried though I shall hail the day when 
those plastic screens disappear from the shops.

-- 
Thomas


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