Depends on what you want to find in your simulations. The shaded regions may be of interest if you are looking into glare, and may switch a sensor. For an overall annual assumption of daylighting potential you may be fine with the uniform transmission approach. Mark Stock has some nice cal-file to create a facade with uniformly distributed openings, but in general mixfunc is perfect to describe such systems. Of course unless the facade / mullions are not flat but have a thickness to consider (again for e.g. glare).
Cheers, Lars.
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On 17.09.2010 16:55, Reinhart, Christoph wrote:
Very interesting threat Randolph. I have been recommending to my
students to simply reduce the visible transmittance of the glazing by
20% (assuming a 20% frame to window ratio).