POV-Ray : Newsgroups : povray.advanced-users : The alpha channel Server Time
26 Nov 2024 22:51:40 EST (-0500)
  The alpha channel (Message 1 to 5 of 5)  
From: T'vakah
Subject: The alpha channel
Date: 13 Jul 1999 11:55:03
Message: <378b6157@news.povray.org>
This is probably a dumb question, but I was too lazy to look through the
docs.  Is there a way that I can use an image map in the pigment of a
texture, and then use the alpha channel of that image in the normal?  I read
of this being done with Softimage, and wondered if POV could do it.

Thanks, T'vakah


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From: Ron Parker
Subject: Re: The alpha channel
Date: 13 Jul 1999 12:32:55
Message: <378b6a37@news.povray.org>
On Sun, 13 Jul 1997 11:55:39 -0400, T'vakah wrote:
>This is probably a dumb question, but I was too lazy to look through the
>docs.  Is there a way that I can use an image map in the pigment of a
>texture, and then use the alpha channel of that image in the normal?  I read
>of this being done with Softimage, and wondered if POV could do it.

In general, it's not considered a good thing to trade a little effort
on your part for a greater (and probably duplicated) effort on our part.
That said, you wouldn't have found what you were looking for anyway
because there is no way to do that in the current official version of
POV.  I think you can do it with the image_pattern patch that's 
included in both Nathan Kopp's UVPOV (http://nathan.kopp.com/patched.htm)
and in the Superpatch (http://www2.fwi.com/~parkerr/superpatch)


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From: T'vakah
Subject: Re: The alpha channel
Date: 13 Jul 1999 14:34:39
Message: <378b86bf@news.povray.org>
I'll keep that in mind.  UV-POV looks like what I am looking for.

T'vakah


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From: Margus Ramst
Subject: Re: The alpha channel
Date: 13 Jul 1999 15:56:18
Message: <378B9A00.B6EB1F2C@peak.edu.ee>
Why not just split the alpha channel and save it as gif?

Margus

T'vakah wrote:
> 
> This is probably a dumb question, but I was too lazy to look through the
> docs.  Is there a way that I can use an image map in the pigment of a
> texture, and then use the alpha channel of that image in the normal?  I read
> of this being done with Softimage, and wondered if POV could do it.
> 
> Thanks, T'vakah


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From: T'vakah
Subject: Re: The alpha channel
Date: 14 Jul 1999 17:36:14
Message: <378d02ce@news.povray.org>
Margus Ramst <mar### [at] peakeduee> wrote in message
news:378B9A00.B6EB1F2C@peak.edu.ee...
> Why not just split the alpha channel and save it as gif?
Because that would defeat the purpose of having just one image for the
texture.

T'vakah


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