When you are doing outdoor photometrics, you generally do not want the foot-candle levels to be displayed inside the building outline. The extra zeroes both clutter the drawing and are included when calculating the statistics, resulting in incorrect values.
If the boundary is drawn using the Insert Photometric Solid: Line command, foot-candle levels 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 you set the starting elevation to 0, foot-candle levels will not appear inside the building, as shown below.
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