Voided area in my surface

[Anonymous]

What would be causing this area of my surface to not fill in? There is no boundary or masked area in my surface.

[Anonymous]

I've had this happen to me when editing the tin lines (deleting in particular) to modify the surface boundary.  A few ideas that have worked to fix this:

1. Select the surface (verify that the TIN lines are showing) > select Edit Surface in the Modify panel > select Add Line > draw the lines manually to connect through this area.
2. If you have feature lines/polylines on the road/berm, try adding these to the surface again.
3. If you made any edits previously, try removing them from the surface definition.
4. If all else fails, you can generate a "patch" surface using your feature lines from #2, and pasting this surface into your surface with the hole.

[mikeevans6697]

Can you attaché the file so we can look at the structure of the surface definition?

[Civil3DReminders_com]

Probably the tesslation methodology Autodesk uses that sometimes indicates a line shouldn't be added. I'd use a feature line or 3dpolyline at the end of the area not showing to get Civil 3D to triangulate there.