[Radiance-general] Strange halo artifact in rendering

[Jack de Valpine]

Hey Mark,

What are your parameters? Have you taken a look at -dr, -dc, -dt?

-Jack

-- 
Jack de Valpine
President

Visarc Incorporated
www.visarc.com

channeling technology for superior design and construction

On 3/15/2013 8:46 AM, Mark Stock wrote:
> Kai,
>
> Thanks for checking. Which files were missing?
>
> Changed black frame to "0.03 0.03 0.03 0.0 0.2" and no change.
>
> Mark
>
> On 3/15/13, Kai Babetzki <Babetzki at transsolar.com> wrote:
>> Hi Mark,
>>
>> I tried to run your example but I failed. Some files seem to be missing.
>> What about increasing the roughness of your black frame?
>>
>> Best Kai
>>
>>
>>
>>
>> 	Freundliche Grüße
>> 	Kai Babetzki
>> 	Dipl.-Phys. Kai Babetzki
>> 	Mailto:babetzki at transsolar.com phone: +49-711-67976-288
>> 	http://www.transsolar.com fax: +49-711-67976-11
>> 	---------------------------------------------------------------------------------------------------------------------------------------
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>>
>> -----Ursprüngliche Nachricht-----
>> Von: Mark Stock [mailto:mstock at umich.edu]
>> Gesendet: Freitag, 15. März 2013 05:56
>> An: radiance-general at radiance-online.org
>> Betreff: [Radiance-general] Strange halo artifact in rendering
>>
>> Folks,
>>
>> I am stumped. There is a halo around a black box on a grey background in a
>> rendering, and I can't figure out how to get rid of it (because I can't
>> imagine that it's real).
>>
>> I am preparing renderings for an art submission, and I am simulating a
>> little model mountain inside a small flat black frame on a light grey wall,
>> in a room with an array of ceiling lights and one spot. Here is what happens
>> (rpict and mountain-removed rvu):
>>
>> http://markjstock.org/transfer/whyTheHaloMaster.png
>> http://markjstock.org/transfer/whyTheHalo.png
>>
>> The black material is plastic with 0.0 specularity.
>> The halo is independent of the ambient parameters.
>> The halo is independent of -lw refinement.
>> The halo is still there if the black box touches the wall or is offset a
>> little.
>> The halo doesn't go away when I render at high resolution.
>>
>> Can anyone tell me what is going on here? Unzip and run "make" on:
>> http://markjstock.org/transfer/whatGives.zip
>>
>> Mark
>>
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