Flipped Cross Sections

Hi,

When constructing a bridge model I imported a curve from Revit and set the cross section to repeat at points along the curve, then to loft a solid between the cross sections.

However the cross sections at points seem to have flipped upside down.

Could anyone tell me why this has happened?

Thanks

Hi @MBaxyy ,
I assume you used coordinatesystematparameter then geometry.Transfrom ? This happens when the curve goes from convex to concave:

You can tackle the issue by being more specific when creating the coordinate system, like this:

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Much appreciated thank you!

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