[Radiance-general] One (or more) window behind another

[Greg Ward]

Hi Malcolm,

In general, you can arrange your input surfaces for mkillum any way you 
think will benefit your calculation.  You don't have to worry about 
what happens when one window sees another, but if you want to know what 
happens in such cases, check out section 13.1.3 in "Rendering with 
Radiance" starting on page 572.

If you still have questions, maybe you could be a little more specific 
about your concerns.
-Greg

> From: "Malcolm Macpherson" <mm at waterslade.com>
> Date: January 21, 2005 9:12:39 AM PST
>
Hi,

 I am calculating Average Daylight Factors by sampling the illuminance 
on a grid within the room.

I frequently come across situations where there are two completely 
separate layers of glazing serving a room.  One example is for a room 
looking into an atrium with a glazed roof. There is one layer of 
glazing in the window in the room, and a second in the roof.  I am not 
sure how best to treat this.   Normally I would use mkillum on the room 
glazing, and allow daylight to penetrate through the atrium roof.  Does 
anyone know if there is possibly a 2 stage procedure so that the atrium 
roof is treated as a secondary source as well as the room window?

Another example, this time with 3 layers of separate glazing, is 
where there is a corridor between the room in the above example and the 
glazed atrium, and the corridor has windows looking into the atrium.

I would be glad of anyone's thoughts on this.

Malcolm