Curb issues

[mdipasquale]

I have an assembly that includes basic lane transition, basic curb and gutter, and daylight general. I have two alignments with FG profiles, CL and lip. Transition is set up as change offset and elevation. At areas where the transitions occur(where the Flow line alignment is not parallel to the center line alignment) I get a strange curb. The corridor seems fine but the curb is screwed up. Attached is an image showing the curb. Any thoughts?

[sboon]

Are we looking at a corridor surface in your attachment?

[mdipasquale]

No. It is the FG surface with object viewer.

[BrianHailey]

Did you add the appropriate feature lines from your corridor to your surface?

Brian

[sboon]

Your problem appears to be related to the Delauney Triangulation algorithm, which Civil3D uses to build surfaces. One of the rules of Delauney leads to triangles that are built with all three sides as short as possible - every point is supposed to be connected to its nearest neighbors.

It's hard to tell from the image, but I'm guessing that the taper in your curb line is creating a situation where the flowline point at each station is closer to the top of curb and back of curb points of the next station, so those three points are connected as a triangle. The result of this is the surface you are seeing.

The solution to the problem is fairly simple. When you build a surface in a corridor, using either links or feature lines check the "use as breakline" option. This will force the TIN to follow the breaks, and should clean up the edges of the curb.

[mdipasquale]

The surface I created was with Data Type:Links and Specify Code:Top.

[sboon]

Open the Surfaces tab in the corridor properties and turn on the checkbox for the Add as Breakline option. If that doesn't solve the problem then add Feature line data to your surface, using the Flowline and Top of Curb codes until you get what you need.

[mdipasquale]

I tried the breakline option but didn't help. I then built the surface with feature lines data and it solved the problem. Very clean surface. Just need to make sure I use all the correct feature lines! Thanks for all your help.

[mdipasquale]

Using the feature lines for the surface, should the panorama tool show Errors for the FG with description as Breakline?

[sboon]

Duplicate point errors, or something else?

[mdipasquale]

The error description is breakline (x1,y1) - (x2,y2) not added - crossed a point at (x3,y3).

[sboon]

The corridor is now adding data at the link points, then adding data for the feature line points. Since they cross, the software rejects the extra point.

It shouldn't be a problem, since the coordinates are the same.