Aabha

I have made a 3D design in PVsyst using the PV Tables as sheds. I have made same design using PV Table with frame. I am getting different outputs in both the modelling. The 3D Shading scene is matching in both the designs. I am getting more near shading irradiance losses in PV Tables as sheds. How PV Syst calculates the shading? Please let me know at the earliest.