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The Solar Distribution setting is more about non-convex zones, non-convex surface warnings will apply to the ConvexWeilerAtherton setting for polygon clipping algorithm in the ShadowCalculation object. For that any self-shading of the exterior envelope can be in serious error for non-convex receiving surfaces. But the default shadow calculation is now (since V7) SutherlandHodgman and it should be able to handle simple non-convex surfaces. I would look into the warnings fairly closely before ignoring them.