[Radiance-general] Three-Phase Method - subdivision of window with sensor located close to the window

[Andy McNeil]

Hi Anne,

Hmmm.  I didn't notice that you're using rsensor to generate rays.  Unfortunately my suggested pattern for subdividing the window is useless.  And using glow probably won't make much difference - unless your sensor has a tight and/or peaky sensitivity distribution.  Can you share information about the sensors sensitivity?  Maybe share the sensor dat file?  Also, is your sensor on the ceiling or the window head?

Andy



On Apr 28, 2011, at 11:42 AM, Greg Ward wrote:

> Hi Anne,
> 
> I agree that you should try the glow window.  If you are using the rsensor program as your script seems to indicate, rays will be distributed over the window independently from how you've defined it.  Only the secondary bounces will care if it's a light source or a glow and whether it's subdivided, and those should not matter to the results.  This leaves the puzzle of why your output varies so much in the first place.  
> 
> Have you tried generating hemispherical fisheye views from the sensor position under the different simulation conditions?  This is always my favorite way of debugging such problems.
> 
> Best,
> -Greg
> 
>> From: David Geisler-Moroder <david.moroder at gmail.com>
>> Date: April 28, 2011 11:24:17 AM PDT
>> 
>> Hi Anne,
>> 
>> give Andy's suggestion using the glow material a try - I usually do that for large windows (i.e. in most cases) to avoid the 
>> subsampling problem of the "window lights". Even if you do not put sensors close to the window, you mostly have walls 
>> somewhere close to the window where the same issue arises. 
>> Manually subdividing is only necessary - as Andy states - if it's needed because of changes in the exterior illumination.
>> 
>> Cheers,
>> David
> 
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