[Radiance-general] Simulating rooms with blinds: performance
Randolph M. Fritz
RFritz at lbl.gov
Fri Jan 7 09:54:19 PST 2011
On 2011-01-05 12:50:05 -0800, Greg Ward said:
> Hi Randolph,
>
> Depending on whether you need to compute the direct component precisely
> or not, the optimal calculation of a space with venetian blinds is
> going to come from rtcontrib or mkillum with a BSDF file describing the
> blinds. If you use genBSDF to create this file, the geometry is
> inserted into the final model using mkillum. If you don't care so much
> about the direct component (sunlight passing between the slats onto
> interior surfaces), then rtcontrib will be much faster if you are
> computing many time points. My feeling is that this should work well
> enough for glare evaluations.
>
> Cheers,
> -Greg
Thanks, Greg. If sunlight is getting through the blinds, we're doing
it wrong, so I think I'll try rtcontrib, though I probably need to
consult with the rest of my team first.
Randolph
>
>> From: "Randolph M. Fritz" <RFritz at lbl.gov>
>> Date: January 5, 2011 11:34:22 AM PST
>>
>> I've been working with a simple model for glare studies, based on an
>> LBL test room with blinds. The results are looking pretty good, but as
>> soon as I put the blinds into the model, single-case simulation times
>> went up to 2.5-3.5 hours. Does anyone have any feeling for these
>> times? Are they reasonable for a naïve model or too high? The
>> processor used is a quad-core AMD Opteron 2376 (2300 MHz) and I've been
>> using Delaunay's implementation of the Perez sky model, gendaylit, and
>> calculating five ambient bounces.
>>
>> Possible lines of attack on the problem:
>> -- Using genBSDF/mkillum (suggested by a colleague.)
>> -- Simplify the blind model; use flat rather than curved slats.
>> -- Review the rtrace parameters I am using. I'm rereading John
>> Mardaljevic's chapter in RwR on Daylight Simulation, looking for hints,
>> but Mardaljevic (are you out there?) was primarily working with
>> overcast skies, which aren't adequate for glare models, so I'm not sure
>> how much of his advice still applies. I'm also going to be sweeping
>> the archives of this mailing list for ideas.
>>
>> Anyone have additional suggestions? Any thoughts on which to try
>> first? Are there particular articles it might be helpful to look at?
>> --
>> Randolph M. Fritz • RFritz at lbl.gov
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