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Question: In the 3D model, how do I show the portions of the corridor that are below the existing ground surface?
Answer: The video below shows how to mask the terrain reference in the 3D model to show the corridor as it falls below existing ground elevations.
Click the video below to play it. To view in fullscreen mode, first click the YouTube link at the bottom of the video to launch the video on the YouTube site. Then, click the fullscreen button (rightmost button at bottom of video).
Recorded in 1280 X 720 resolution.