Unroll along Axis
This command unrolls polylines according to a curved axis. It is suitable to make longitudinal profiles of a curved way or a curved bridge for instance.
Requirements
Select the polyline(s) and/or the set(s) of polylines to unroll, then launch the command.
Select the axis polyline.
Wrong selection can be corrected using .
You can choose to reverse the axis using .
Optionally, apply an offset to the result either manually or automatically. In both cases, the reference altitude parameter is subtracted from the input heights. In other words, let 0 to keep true heights.
Polylines to unroll are supposed to follow the axis in 2D to minimize deformations due to the projection.
Practise
See Exercise: Draw a longitudinal profile in the Beginners Guide.