I'd reiterate that unless data is posted there's not a lot more that can be done - you don't appear to be doing anything incorrectly but it's always easier to be able to try it myself with actual "problem" data
They are regular lines.
Said in my best southern accent, "Well there's your problem right there!"
You can't add an AutoCAD line to a surface as breaklines. You have two options, convert them to polylines and then add them as breaklines or add them as drawing objects.
Modify Panel > Add Data > Drawing Objects
Converting the lines to polylines didn't change anything. I still can't produce a surface. To be able to illustrate this to you guys, I made a new version of the original dwg file I'm working with, just copying a small segment consisting of 3 bars of the entire water pipe in question. I created a new file and used the copy with base point command from my original file to the new one. What is really strange is that in this new file it works perfectly fine to create a surface as in Brians video! And that is despite the fact that 2 of the bars are lines and 1 is a polyline. So, it seems like it's ok to use lines as well as polylines for breaklines and it's no problem to mix them as you like. Still, when I attempt the exact same method in my original file, trying with the exact 3 bars that I copied and that worked perfectly fine in the new file, I get no surface! I add breaklines, select the lines but nothing happens! Seriousely, what is this all about? Could it be that there's some function disabled in my orignial file, so I can't make surfaces? This is just driving me crazy... I guess I could copy all of my original file to make a new one - but it's annoying to give up without knowing what the reason for the problem was! Sadly I can't post the original file since it's from work...
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