Unfold Polyline

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.

1. Select the axis polyline.

2. Wrong selection can be corrected using

3. You can choose to reverse the axis using

4. 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.