Ø 9.5 mm
Automatic keeps closed solids as drawn and wraps anything open or too detailed. The rolling sphere (R = 20 m or more) doesn't see details under about a metre.
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Save this as a .txt file. It opens in the Exposure Analysis tab like any building file, and its draw-sequence line lets the Draw tab reopen the drawing for editing.
Copy this text into your .txt file, replacing its contents. Only the settings lines changed; vertices, faces and comments are as they were.