[Radiance-general] Re: Radmap irradiance shifts

[Andrew McNeil]

I¹m going out on a limb here but I¹d suggest looking at ­dt and ­dc
parameters.

It could be that direct source testing stops earlier than you¹d like for
unobstructed surfaces.  I expect that a scene with ~4000 suns should have
higher parameters for direct sampling anyway.




On 4/29/09 6:33 AM, "Christopher Rush" <Christopher.Rush at arup.com> wrote:

> I have noticed that, actually I've noticed it with a custom script that sums
> up CIE sunny skies, in a cumulative file, then renders irradiance for a scene
> looking at direct only sun (ab 0). In my case I was looking at an exterior
> aerial veiw of one building facade sited amongst other buildings. The odd
> irradiance seems to occur on one of the neighboring buildings that extends
> higher than all the others.
>  
> -Chris
> 
> 
> From: radiance-general-bounces at radiance-online.org
> [mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Chris
> Humann
> Sent: Tuesday, April 28, 2009 3:50 PM
> To: Radiance general discussion
> Subject: [Radiance-general] Re: Radmap irradiance shifts
> 
> Hello All, 
> 
> Was wondering if others have noticed horizontal bands of lower irradiance
> values across the top 1/3 of the images produced from Radmap?  These shifts
> look like strong shadow lines but don't relate to any occluding geometry in
> the scene.  We seem to get these artifacts when using exterior views looking
> down onto the scene and using any number of weather files.
> 
> Thanks,
> Chris H
> 
> Christian Humann ~ Associate
> LOISOS + UBBELOHDE
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> 1917 Clement Avenue  Building 10A
> Alameda, CA  94501 USA
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> 510 521 3800 VOICE
> 510 521 3820 FAX
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> www.coolshadow.com <http://www.coolshadow.com/>
> 
> 
> ____________________________________________________________
> Electronic mail messages entering and leaving Arup  business
> systems are scanned for acceptability of content and viruses
> 
> 
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://radiance-online.org/pipermail/radiance-general/attachments/20090429/5279e85b/attachment.htm