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[EnergyPlus_Support] Some issues about non-convex surfaces

Some issues about non-convex surfaces:

1. I have a non-convex roof in my model and I get a warning about shadowing calculation of this surface. I change the "Polygon Clipping Algorithm" to SutherlandHodgman. But again I get this warning. Why? 

2. I don't get this warning for the floor. Doesn't the floor play any role in shadow calculation (as a receiving surface), even in "FullInteriorAndExterior" solar distribution?

3. This zone is L-shaped. I change the solar distribution to "FullInteriorAndExterior", but I get no warning or errors, while in the reference it's been clearly stated that this solar distribution mode should not be used with non-convex zones.

4. If in an L-shaped zone we break down the roof and floor to convex surfaces, can we rely on the "FullInteriorAndExterior" solar distribution simulation?

 



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