Not recognizing 3DPoly Breaklines

[Anonymous]

I recently encountered a problem where I created a surface from point groups using around 600 points. Then I added about 25 3DPolylines as standard breaklines.  All of the breaklines except for 3 of them worked as expected, and 3 of them had no effect on the surface.  I couldn't fix the problem by recovering or auditing the drawing.  In the end what fixed the problem was reversing the direction of the 3dpolylines that were not working.

Has anyone ever encountered this problem before? Does anyone know what causes it?  I recognized the problem this time because It happened on a road slope, but I worry about not seeing the problem on less recognizable topography.

Thanks for your help

[tcorey]

Did you receive any Event Viewer errors during rebuild of the surface?

[Anonymous]

No, these weren't crossing breaklines, and they weren't sharing any vertecies with adjacent breaklines.  The surface was wrong but didn't give any errors.  The only thing that tipped me off that it was wrong was that the road wasn't symmetrical

[tcorey]

I've never seen that, but Yikes, that's scary. Perhaps creating feature lines from all your 3d polylines before adding as breaklines...

[kcobabe]

Do you have an outer boundary that is cutting them off?

Have you done any manual edits to the surface?

[Anonymous]

No this was before I even added the boundary.  All he breaklines worked after I reversed the direction on the troublesome ones, but at first no matter how much I rebuilt the surface it would not recognize 3 of them.