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Exports Splines from Blender to Megashapes plugin for Unity
Copy the io_scene_sxl to the scripts/addons folder.
Activate addon from "User Preferences > Addons" and use Export from menu (Export -> Bezier Curve (*.sxl) ).
Tilt is not supported in current version on Megashapes.
Default Forward and Up settings work for Unity (Forward > Z Forward and Up > Y Up)
Scale can be used to scale spline to Unity.