Corridor surface boundary issue

[Jerry_Barnes]

I built a simple corridor for a canal using generic subassemblies that grades to existing at 3:1. I created a top surface and added a corridor-boundary shrinkwrap border, but as you can see in the attached screenshot, it does not seem to work on the inside portion of the corridor. I have removed the boundary, rebuilt the corridor, and added it back in several times to no avail. Hoping someone has a solution to this problem. Using C3D 2024.4. 

[m_kingdon · Accepted solution]

Your corridor might be overlapping itself aka a corridor bowtie.  I can't see it from the screenshot, but check this corner.

When a corridor overlaps itself, the corridor boundary shrinkwrap breaks down.  A frustrating limitation.

[Jerry_Barnes]

That was the problem, thank you.