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Autodesk staff, Autodesk Reseller staff, and consultants produce a wide range of video content. Some is product sales demo, but a lot of the staff and/or consultant recordings, lists, and channels include useful application training and helpful tips and tricks for Infrastructure Design products.
Content that is significant video training is listed here.
Please visit included links to the original postings. Those may contain details not included here for the sake of brevity.
5/14/2018
Autodesk's Jerry Bartels explains how to quickly convert Point files from one format to another with the Transfer Points tool in Civil 3D Selection Mode.
From the Jerry's YouTube Channel.
and the Civil Immersion blog.
Where exactly did Autodesk put this command in the Ribbons? Think of it as Output.
3/22/2018
Civil expert Ken Driscol from Applied Software Technology offers tips, tricks, and best practices for for Corridor Modeling in Civil 3D.
From the Applied Software Technology YouTube Channel.
and the Applied Software Technology website.
A basic walk-through of common Civil 3D Corridor mechanics.
The Applied Software YouTude channel also offers shorter videos pulled from this webinar.
3/2/2018
Mark Schnesk of Seiler Design Solutions shows how to utilize an Expression in a Pipe Label Style.
From the Seiler Design Solutions YouTube Channel.
and the Seiler Design Solutions blog.
You could attack this Expression problem differently via the difference of between center to center distance and the inside distance and how that relates to the outside Pipe diameter.
I'd argue this is not an accuracy issue but perhaps a what is suitable issue. Obviously, the length of pipe sections used also bears on the construction and estimating problem.
In the real world you probably need the approximate overage. Whether the pipes are actually installed off the assumed center to center line is also an issue.