POV-Ray : Newsgroups : povray.advanced-users : Background transparency and radiosity Server Time: 19 May 2019 11:07:14 GMT
  Background transparency and radiosity (Message 1 to 6 of 6)  
From: Mike Horvath
Subject: Background transparency and radiosity
Date: 23 Feb 2019 19:01:48
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


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From: Bald Eagle
Subject: Re: Background transparency and radiosity
Date: 23 Feb 2019 21:05:00
Message: <web.5c71b53d83fc1003765e06870@news.povray.org>
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.


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From: Mike Horvath
Subject: Re: Background transparency and radiosity
Date: 23 Feb 2019 21:53:01
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


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From: Bald Eagle
Subject: Re: Background transparency and radiosity
Date: 23 Feb 2019 22:30:00
Message: <web.5c71c88683fc1003765e06870@news.povray.org>
Mike Horvath <mik### [at] gmailcom> wrote:

> Is this a new keyword? I can't find it using Google.

Sorry, try no_image.


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From: Mike Horvath
Subject: Re: Background transparency and radiosity
Date: 24 Feb 2019 03:34:32
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


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From: Alain
Subject: Re: Background transparency and radiosity
Date: 24 Feb 2019 22:16:14
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.


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