Model Sloping Ground Planes — Can the Ground Plane Tilt?

I am currently modelling a 3 storey building, the bottom floor of which is partially below ground (i.e the ground level slopes). Is is possible to alter the plane of the ground in IES to represent a sloping area, or is it always set at 0 in the vertical plane?

Presuming you are thinking of the effect of Solar shading on the bits that slope underground. At present the Ground Plane is a horizontal plane at 0.0 - although you can set the height in SunCast. To model the shading effect I suggest you create obstructions that follow the slope you require (in a similar way to external buildings that cast shadows).

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