C3D 2012 create superelevationcurve method

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C3D 2012

dot net

what is the method to create a superelevation curve in an alignment?

When I try to apply this:

Alignment align1 = ts.GetObject(per1.ObjectId, OpenMode.ForWrite) as Alignment;

align1.SuperelevationCriticalStations.Add(align1.StartingStation, SuperelevationCriticalStationType.BeginNormalCrown);

I get error: Value does not fall within the expected range

I'm guessing the error is caused by the fact that the selected alignment has no superelevation curves.

Thx.

Kevin.

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