[Radiance-general] Daylight factors

[Greg Ward]

Have you checked out the "dayfact" script that's in Radiance  
already?  If you have a model, it does most of the rest of what  
you're asking.

-Greg

> From: Chris Yates <Chris at zed-uk.com>
> Date: June 18, 2009 7:02:47 AM PDT
>
> Dear all
>
> I'm looking to replicate some of the functionality of IES Radiance  
> in the full version of Radiance. This is so we will not be as  
> restricted by licensing ;)
>
> The feature I'm interested in is the illuminance calc on the  
> working plane of a space. This is frequently used to feed in to  
> such things as BREEAM or LEED credits.
>
> OK
> In IES Radiance, working on a multi roomed model,  I would:
> Set up some basics, i.e. CIE overcast, materials, image quality
> Select analysis type "illuminance - working plane" (usually 0.85  
> metres above floor level)
> Select a space
> Simulate!
> Repeat 3 until all the spaces I'm interested in are simulated.
> In terms of post processing I would
> convert each pic to daylight factors
> Query the PIC by tracing an "Area of Interest". This is used to  
> work out DF min, max, ave, uniformity, etc. With this I can exclude  
> overlapping spaces and other features such as notional corridors  
> from the working plane calcs.
> If I were to export a 3rd party CAD model (via, say su2rad)  
> consisting of N number of rooms, are there alternatives to the  
> simple IES approach?
> For example, a cad model would not possess the massing data of IES.
> Perhaps a surrogate for step 3 would be to define the view  
> explicitly in a file?
> How do I set step 2 up?
> I suspect it may all be controlled in view?
> Post processing: Is there a tool with similar "area of interest"  
> functionality for querying PIC files?
> I've had a good search through "Rendering with Radiance" but it  
> doesn't appear to cover this.
>
> Many thanks
>
> Chris Yates