Illuminance Levels Inside Building Outlines

When calculation photometrics, why are illuminance values displayed inside the outlines of my buildings?

If the outline for your building is drawn using the Insert Photometric Solid: Line command, it will not be considered a closed shape and illuminance values will appear inside the building, as shown below.

Instead, draw the boundary using either the Insert Photometric Solid: Rectangle or Insert Photometric Solid: Shape command.

If Starting Elevation is set to 0, illuminance levels will not appear inside the building, as shown below.