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In article <3c24d1b3@news.povray.org> , "Hugo" <nu.@gmx.net> wrote:
> Objects with transparent image_maps have "non-transparent" shadows. POV-Ray
> 3.1 and MegaPov did it very well. Please check the images!
> The object, that caused the problem is the following:
Binaries are not allowed in this group! Please cancel this post and place
the images in povray.beta-test.binaries. Then post here and explain your
problem _without_ the attachments.
For more information, please read:
Message-ID: <38695C99.6B2DCA1A@pacbell.net>
Date: Tue, 28 Dec 1999 16:58:01 -0800
From: Ken <tyl### [at] pacbell net>
Reply-To: lin### [at] povrayorg
Newsgroups: povray.announce.frequently-asked-questions
Subject: Welcome To the POV-Ray News Groups
Xref: news.povray.org povray.announce.frequently-asked-questions:36
Thorsten
____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg
I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org
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Wasn't it Hugo who wrote:
>Objects with transparent image_maps have "non-transparent" shadows. POV-Ray
>3.1 and MegaPov did it very well. Please check the images!
>The object, that caused the problem is the following:
The article that reported this error has been cancelled, because it
contained some binaries. It also didn't contain a complete scene file
that showed the error, and the scene fragment that it did contain was
over complicated.
However, I confirm the existence of the bug that it reported.
Here's a simpler, more complete scene file that displays the problem. To
see the problem you will require something to use as "test.gif" a
palletized image with a significant proportion of the image being colour
zero.
When rendered in pov 3.1, the shadow matches the shape of the non-
transparent part of the object. When rendered in 3.5b9 the shadow is
that the full box.
POV 3.5b9, Win 98se, Celeron II 850, 128 Mb
camera { location <2, 3, -4> look_at <0, 0.5, 0> angle 30}
sky_sphere { pigment {rgb z}}
light_source {<-100,100,-100> colour rgb 1}
light_source {<100,100,100> colour rgb 1}
box {<-0.5,0,0><0.5,1,0.001>
pigment {image_map {gif "test.gif" transmit 0,1}
translate <-0.5,0,0>}
}
plane {y 0 pigment {rgb 1}}
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