Question-and-Answer Resource for the Building Energy Modeling Community
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As discussed in the IO Reference:
If this option is used [FullInteriorAndExterior or FullInteriorAndExteriorWithReflections], you should [...] also be sure that the zone is convex.
Your zone isn't convex:
Option A: Stick to either option FullExterior or FullExteriorWithReflections.
Option B: Add an explicit ShadowCalculation object in your IDF, and switch to PixelCounting:
ShadowCalculation, PixelCounting, Periodic, 1;Tested both options - no reported issues. See similar discussion here.
