POV-Ray : Newsgroups : povray.beta-test : Filter does not work properly in sky sphere Server Time
30 Jun 2024 13:22:36 EDT (-0400)
  Filter does not work properly in sky sphere (Message 1 to 5 of 5)  
From: clipka
Subject: Filter does not work properly in sky sphere
Date: 7 May 2010 10:19:39
Message: <4be4217b$1@news.povray.org>
I just noticed that "filter" does not work properly with (multi-layered) 
sky spheres.

When using "transmit" in the pigments of a multi-layered sky_sphere, 
they behave exactly like layered textures with the corresponding 
pigments, i.e. the following look virtually identical:

(A)
   sky_sphere {
     pigment { Sky_Pigment_1 }
     pigment { Sky_Pigment_2 }
     pigment { Sky_Pigment_3 }
   }
(B)
   sphere { 0, 1
     texture { pigment { Sky_Pigment_1 } finish { ambient 1 diffuse 0 
specular 0 } }
     texture { pigment { Sky_Pigment_2 } finish { ambient 1 diffuse 0 
specular 0 } }
     texture { pigment { Sky_Pigment_3 } finish { ambient 1 diffuse 0 
specular 0 } }
     scale 10000
     no_shadow
   }

However, when using "filter" instead, the layered-texture sphere's look 
changes significantly (as expected), while the sky_sphere still looks as 
if "transmit" had been used (unless the background can be seen through, 
but in that case it still looks different from the layered-texture sphere).

As with many errors I reported here recently, this one appears to have 
been around ever since, so a change would affect existing scenes.

I'd advocate to change it nonetheless (or make it depend on the #version 
statement), to give the same results as the layered-texture sphere.

Comments, anyone?


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From: Thomas de Groot
Subject: Re: Filter does not work properly in sky sphere
Date: 8 May 2010 03:18:50
Message: <4be5105a$1@news.povray.org>
"clipka" <ano### [at] anonymousorg> schreef in bericht 
news:4be4217b$1@news.povray.org...
> I'd advocate to change it nonetheless (or make it depend on the #version 
> statement), to give the same results as the layered-texture sphere.
>
> Comments, anyone?

Good spotting!

Change it yes, but make it #version dependant, I would say.

Thomas


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From: Kenneth
Subject: Re: Filter does not work properly in sky sphere
Date: 8 May 2010 13:55:00
Message: <web.4be5a4a94656c784ae92d9930@news.povray.org>
"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:

> Good spotting!
>
> Change it yes, but make it #version dependant, I would say.

Agreed.  (I never noticed this before--but then, I hardly ever apply multiple
pigments to a sky_sphere, let alone with 'filter.') So *many* possibilities, so
little time...

BTW, I just successfully changed my POV-Ray email address, the one I log-in
with. Yippee! (Although, this post is still showing my old one.  Hmm, looks like
I need to change something else somewhere...)

Ken


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From: Mr
Subject: Re: Filter does not work properly in sky sphere
Date: 16 May 2010 16:30:00
Message: <web.4bf055704656c7846d33b2480@news.povray.org>
When it's repaired, it will probably also solve the problem I had mentionned
with the background vs skysphere alpha color handling I had reported here:

http://news.povray.org/povray.beta-test/thread/%3Cweb.4b92a5b2a915a27a1408b2c10%40news.povray.org%3E/?mtop=342575&moff=
10


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From: clipka
Subject: Re: Filter does not work properly in sky sphere
Date: 16 May 2010 18:46:45
Message: <4bf075d5$1@news.povray.org>
Am 16.05.2010 22:28, schrieb Mr:
> When it's repaired, it will probably also solve the problem I had mentionned
> with the background vs skysphere alpha color handling I had reported here:
>
>
http://news.povray.org/povray.beta-test/thread/%3Cweb.4b92a5b2a915a27a1408b2c10%40news.povray.org%3E/?mtop=342575&moff=
> 10

No, not really - this particular issue I observed doesn't seem to have 
anything to do with that blender problem you reported back then.


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