POV-Ray : Newsgroups : povray.general : [3.8] User defined camera Server Time: 19 Feb 2019 22:49:28 GMT
  [3.8] User defined camera (Message 1 to 4 of 4)  
From: ingo
Subject: [3.8] User defined camera
Date: 19 Jan 2019 14:57:16
Message: <XnsA9DCA24E27240seed7@news.povray.org>
When I set the user defined camera / projection to 
direction {
  function { 0 }
  function { 0 }
  function { 0 }
}
it 'traces to nowhere' and renders black, which makes sense. But now I ran 
into one where it doesn't.
I'm creating a tile rendering camera for displaying images with 
leaflet.js. Tiles are 256x256, but the aspect ratio of the image/ camera 
settings may be different, thus creating black borders.
Is it possible and does it make sense to have POV-Ray to render a 
transparant pixel instead of black when an output file format is used that 
supports transparancy?

ingo


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From: Alain
Subject: Re: [3.8] User defined camera
Date: 19 Jan 2019 17:13:02
Message: <5c435a9e$1@news.povray.org>
Le 19-01-19 à 09:57, ingo a écrit :
> When I set the user defined camera / projection to
> direction {
>    function { 0 }
>    function { 0 }
>    function { 0 }
> }
> it 'traces to nowhere' and renders black, which makes sense. But now I ran
> into one where it doesn't.
> I'm creating a tile rendering camera for displaying images with
> leaflet.js. Tiles are 256x256, but the aspect ratio of the image/ camera
> settings may be different, thus creating black borders.
> Is it possible and does it make sense to have POV-Ray to render a
> transparant pixel instead of black when an output file format is used that
> supports transparancy?
> 
> ingo
> 
Have you tried using background{rgbt 1} ?


Obviously, you also need to specify an output with transparency. Use +ua 
on the command line and output to PNG, TGA or EXR (high dynamic range 
format)


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From: ingo
Subject: Re: [3.8] User defined camera
Date: 19 Jan 2019 18:13:35
Message: <XnsA9DCC396EFE71seed7@news.povray.org>
in news:5c435a9e$1@news.povray.org Alain wrote:

> Have you tried using background{rgbt 1} ?
> 

Hah, that indeed works, but also requires a sky_sphere or something else 
containing the scene to isolate it from the background.

Excelent,

Thanks Alain,

ingo


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From: ingo
Subject: Re: [3.8] User defined camera
Date: 19 Jan 2019 18:30:46
Message: <XnsA9DCC68058093seed7@news.povray.org>
in news:5c435a9e$1@news.povray.org Alain wrote:

> Have you tried using background{rgbt 1}

after a bit of fiddling only +ua has to be set to render it to 
transparent, background colour is of no influence on these sections. 
I.i.r.c the same for the blackness around the fishey lens. 

ingo (things are comming back slowly in my old brain)


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