Span direction on a curved roof

[david_peterson]

So I have roof deck that's running more or less along the curve or a roof. At each bay it will change direction (by 3.45 degrees). The framing is perpendicular to the curve at the mid point of each bay. So I don't have a boundary line that is along the direction of the span.
Question.
How can you assign a span direction if you don't have any boundary line that is parallel to the direction of the span.
Thanks in advance.

[Dimitri Harvalias]

Dave, sorry to leave you hanging. :Oops:
You can 'draw' the span direction line anywhere you want. See the image below.
The beam system tool works the same way.
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