Add Beam doesn't always work even when the input curve is a planar spline


I am using the “Add Beam” grasshopper component to draw the ribs of a curved roof steel shell.
Sometimes the component works perfectly when I use a curve generated by the “interpolate” component of Grasshopper. And sometimes it doesn’t, and I don’t understand why. My curves are all planar and the interpolation used is of degree 3.

I tried to change the beam type to a round hollow section to prevent errors due to cross-section rotation, and it still doesn’t work. Has anyone encountered the same issue?

Many thanks


@zoe.champion I’m not a structural engineer but this seems to be a Revit limitation. It fails to create the beam at specific cross section angles