Background transparency and radiosity (Message 1 to 6 of 6)
From: Mike Horvath
Subject: Background transparency and radiosity
Date: 23 Feb 2019 14:01:48
Message: <5c71989c$1@news.povray.org>
In my current scene I have a bunch of stuff on top of a white background
which look bright and crisp and colorful. When I try to set the
background to transparent the colors look much more muted. It looks the
same as if the background were black instead of white. The scene uses
radiosity which I think is the issue.
How do I create a scene that has a transparent background that is not
interpreted as black by radiosity? Thanks.
Mike
Mike Horvath <mik### [at] gmailcom> wrote:
> How do I create a scene that has a transparent background that is not> interpreted as black by radiosity? Thanks.
Maybe try a large hollow white sphere with the no_object flag set?
Then it should still have reflection and radiosity.
From: Mike Horvath
Subject: Re: Background transparency and radiosity
Date: 23 Feb 2019 16:53:01
Message: <5c71c0bd$1@news.povray.org>
On 2/23/2019 4:03 PM, Bald Eagle wrote:
> Mike Horvath <mik### [at] gmailcom> wrote:> >> How do I create a scene that has a transparent background that is not>> interpreted as black by radiosity? Thanks.> > > Maybe try a large hollow white sphere with the no_object flag set?> Then it should still have reflection and radiosity.> >
Is this a new keyword? I can't find it using Google.
Mike
From: Mike Horvath
Subject: Re: Background transparency and radiosity
Date: 23 Feb 2019 22:34:32
Message: <5c7210c8$1@news.povray.org>
On 2/23/2019 4:03 PM, Bald Eagle wrote:
> Mike Horvath <mik### [at] gmailcom> wrote:> >> How do I create a scene that has a transparent background that is not>> interpreted as black by radiosity? Thanks.> > > Maybe try a large hollow white sphere with the no_object flag set?> Then it should still have reflection and radiosity.> >
Thanks! I also set the emission of the sphere to 1.0 and diffuse to 0.0.
This workaround should really be documented.
Mike
From: Alain
Subject: Re: Background transparency and radiosity
Date: 24 Feb 2019 17:16:14
Message: <5c7317ae$1@news.povray.org>
Le 19-02-23 à 16:03, Bald Eagle a écrit :
> Mike Horvath <mik### [at] gmailcom> wrote:> >> How do I create a scene that has a transparent background that is not>> interpreted as black by radiosity? Thanks.> > > Maybe try a large hollow white sphere with the no_object flag set?> Then it should still have reflection and radiosity.> >
I think that you mean no_image.
no_image : Not seen directly, but will be seen in reflection, cast
shadows and affect radiosity.
no_shadow : Act normally except for not casting any shadow.
no_reflection : Is never seen as a reflected and possibly also refraction.
no_radiosity : Is ignored when calculating radiosity.
com> wrote: