[Radiance-general] Strange halo artifact in rendering

[Mark Stock]

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
> 	---------------------------------------------------------------------------------------------------------------------------------------
> 	Transsolar KlimaEngineering
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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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