Question-and-Answer Resource for the Building Energy Modeling Community
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It would be helpful if you could share a bit about the model. What is relationship of the points of interest to the transfer matrix surfaces? Is there even a T matrix? In other words, is this a single phase (some folks call it two-phase, mmm hmm), where you are tracing rays from the POI directly thru fenestration and to the sky, or is it three-phase? If the former, how complicated is the window interface geometry? If it's complicated, you may want to consider the three phase method. My gut reaction is that you have some complex geometry at the perimeter and so even with the aggressive sampling settings you have there for the view matrix, you're getting a lot of variation.
