Unroll along Axis

images/download/attachments/137619345/CmdUnrollAlongAxis.svg

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 usingimages/download/attachments/137619345/CursorGrey.svg .

  3. You can choose to reverse the axis usingimages/download/attachments/137619345/InvertDirection.svg .

  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.