By Garry Stockton
If you’re having issues measuring rounded objects accurately, such as the bottom sides of pipes, you’ll need to turn on Edge Snapping.
Go to Navisworks Options Editor and under Interface>Snapping, make sure “Snap to Edge” is enabled. This will allow you to snap your measurement tool to the edges of vectors, which is conveniently usually located on the bottom and topmost sides of cylinder-shaped objects.
See duct in image