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Curved seat tube: seat tube angle number shown Q.

I drew up -to my best ability- the measurements of the Columbus 29r curved seat tube in the tube section. 

When I select to display the seat tube angle of my CAD frameset drawing, is the angle measured from the bottom bracket centre to the top centre of the seat tube, or is it just the angle of the long/straight main length portion of the tube?

Thanks in advance.

Seat tube angle for curved seat tubes

In BikeCAD, the seet tube angle is the angle of the top straight section of seat tube. That and an alternative seat tube angle measurement are discussed at: bikecad.ca/angle_from_bb_to_top_of_seat_tube. Also, somewhat related is this dimension is: bikecad.ca/effective_seat_tube_angle.

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