POV-Ray : Newsgroups : povray.binaries.scene-files : Can't get emission to work! Server Time
31 Oct 2024 19:49:19 EDT (-0400)
  Can't get emission to work! (Message 1 to 6 of 6)  
From: SharkD
Subject: Can't get emission to work!
Date: 5 Jun 2010 18:36:44
Message: <4c0ad17c$1@news.povray.org>
I've attached a file with an emissive object I can't seem to get 
working. What is incorrect?


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Attachments:
Download 'gh_scene_spinner_cubemap_emission.pov.txt' (3 KB)

From: SharkD
Subject: Re: Can't get emission to work!
Date: 5 Jun 2010 20:18:34
Message: <4c0ae95a$1@news.povray.org>
On 6/5/2010 6:36 PM, SharkD wrote:
> I've attached a file with an emissive object I can't seem to get
> working. What is incorrect?
>
>


I figured out that I needed to make /all/ container objects hollow, not 
just the one with the interior.

-- 
http://isometricland.com


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From: Alain
Subject: Re: Can't get emission to work!
Date: 7 Jun 2010 14:28:52
Message: <4c0d3a64@news.povray.org>
Le 2010-06-05 18:36, SharkD a écrit :
> I've attached a file with an emissive object I can't seem to get
> working. What is incorrect?
>
>

Your large world sphere is not hollow, suppressing any media within it's 
confine.

Why are you setting ambient_light 0? There is no reason for doing that, 
even in a radiosity scene, especialy if you want anything to actualy 
glow beside emissive medias.
The purpose of that setting is to globaly change the colour of the 
ambient part of all finishes.

The best way is to set the default finish to have amnient 0.


Alain


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From: SharkD
Subject: Re: Can't get emission to work!
Date: 7 Jun 2010 17:02:05
Message: <4c0d5e4d$1@news.povray.org>
On 6/7/2010 2:28 PM, Alain wrote:
> Why are you setting ambient_light 0? There is no reason for doing that,
> even in a radiosity scene, especialy if you want anything to actualy
> glow beside emissive medias.
> The purpose of that setting is to globaly change the colour of the
> ambient part of all finishes.


Not sure... I started by reusing files from other scenes.

-- 
http://isometricland.com


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From: clipka
Subject: Re: Can't get emission to work!
Date: 8 Jun 2010 06:53:44
Message: <4c0e2138$1@news.povray.org>
Am 07.06.2010 20:28, schrieb Alain:

> Why are you setting ambient_light 0? There is no reason for doing that,
> even in a radiosity scene, especialy if you want anything to actualy
> glow beside emissive medias.
> The purpose of that setting is to globaly change the colour of the
> ambient part of all finishes.
>
> The best way is to set the default finish to have amnient 0.

( I personally disagree - both solutions are just kludges, and both have 
disadvantages. My personal preference is to set ambient_light to some 
very low value when using radiosity - e.g. 0.001 - and set ambient to a 
correspondingly high value - in this case 1000 - for objects that should 
appear to be glowing (again, only when using radiosity).

The /really/ best way to do it, however, would be to patch POV-Ray so 
that object "glow" could be modeled without misusing the classic ambient 
mechanism. )


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From: SharkD
Subject: Re: Can't get emission to work!
Date: 8 Jun 2010 12:05:20
Message: <4c0e6a40@news.povray.org>
On 6/8/2010 6:53 AM, clipka wrote:
> Am 07.06.2010 20:28, schrieb Alain:
>
>> Why are you setting ambient_light 0? There is no reason for doing that,
>> even in a radiosity scene, especialy if you want anything to actualy
>> glow beside emissive medias.
>> The purpose of that setting is to globaly change the colour of the
>> ambient part of all finishes.
>>
>> The best way is to set the default finish to have amnient 0.
>
> ( I personally disagree - both solutions are just kludges, and both have
> disadvantages. My personal preference is to set ambient_light to some
> very low value when using radiosity - e.g. 0.001 - and set ambient to a
> correspondingly high value - in this case 1000 - for objects that should
> appear to be glowing (again, only when using radiosity).
>
> The /really/ best way to do it, however, would be to patch POV-Ray so
> that object "glow" could be modeled without misusing the classic ambient
> mechanism. )

I'm using LightSys by the way. The demo scenes all tend to turn ambient 
off by default.

-- 
http://isometricland.com


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