AutoCAD Civil 3D

[#1]

I have a pretty basic corridor composed of 3 assemblies, total length of <5000 LF. All assemblies generally are using the lane outside AOR, shoulder extend all & generic links to create a borrow ditch. The different assemblies are being used simply for a few regions with slight geometry difference (e.g. wider or narrower borrow ditch).

Nearly halfway inside my third region I am getting a horrible 'bobble' in my surface (see attached. Everything on either side models nicely. I have checked the profile, targets, frequency, tried to make sense of the triangulation in this area. Everything seems to be correct other than this small portion of the corridor. Has anyone ever seen something like this before?

I am at my wits end trying to diagnose this one!

[#2]

I've experienced something like this before. Are you at a region change? What I did to fix my issue was pretty elementary. I copied my assembly, changed them name, and inserted it in the area where my corridor seemed to have a min of its own.

If that doesn’t work maybe try to create a gap there and let cad extrapolate between the 2 ends. Make sense? End one region about  2m before it starts to bugger and then insert a new region about 2m after the bugger and cad should look for similar links in the assemblies and connect them.

If that doesn’t work, try having a doughnut.

[#3]

There are a few possible causes for this problem.  Can you post the drawing for us to look at?

[#4]

Doughnut...that is funny!

When you really hit rock bottom and are ready to slit your wrists... Cough up the corridor, all targets and assemblies for full dissection.

[#5]

No problem.

Files are too big for Autodesk. Here is a dropbox link to the corridor file and also the xref file in the off chance the xref has something to do with it.

Corridor: https://www.dropbox.com/s/nphpt9pjco4qjei/Local%20Road%20SRF.dwg

xref: https://www.dropbox.com/s/lxn0oc0uqrbeuk7/SH-16%20BASE%20-%20CLEAN.dwg

Thanks or the help!! 

[#6 · Accepted solution]

Thaw the layer your corridor is on and what you'll see is this:

Your corridor is targeting a polyline but at the north end of the corridor, it can't reach the polyline because it ends short but, it can reach it WAY over by that other part of the corridor and that is why you are seeing the "wonky" contours. Adjust your corridor so it doesn't extend beyond the polyline, adjust the polyline so it extends to the end of the corridor, or split the region at the end of the polyline and have the last bit not target the polyline.

[#7]

Thank you so much for the help. A good lesson in keeping the corridor visible until I'm happy with the results!!

I have always thought the corridor would default to assembly width if no target is available, but never considered what happens when the corridor is perpendicular to a target 1/2 a mile away!!

[#8]

Thank you pullmuller. I will try you're separate region workaround, even though this problem is near the middle of a well modeled region. My fall back plan was to fix it with feature lines, as this section is in a consistent profile slope. I would be very interested in what might cause this problem though. It seems as though I must be doing something wrong. Sent from my iPhone

[#9]

Well that's embarrassing! A simple look at frozen layers solved the problem. Extended my target pl a few feet and the whole drawing cleaned up nicely! Thank you for the help. Good lesson in keeping the corridor visible until I'm happy with the results. Thanks again!! Sent from my iPhone