[Radiance-general] Re: Radmap irradiance shifts

[Chris Humann]

Thank you all.   Paying closer attention to the -dt and -dc parameters  
makes a lot of sense.  Sure enough, setting -dt 0 and -dc 1 improves  
the results and  fixes the artifact problem.

Regards,
Chris
Christian Humann ~ Associate
LOISOS + UBBELOHDE
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On Apr 29, 2009, at 10:36 AM, Andrew McNeil wrote:

> I’m going out on a limb here but I’d suggest looking at –dt and –dc  
> parameters.
>
> It could be that direct source testing stops earlier than you’d 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/>
>>
>>
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