---
title: "Unfold Polyline"
slug: "cyclone-3dr-unrollalongaxisc"
updated: 2026-09-07T11:51:46Z
published: 2026-09-07T11:51:46Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-unrollalongaxisc"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://rcdocs.leica-geosystems.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Unfold Polyline

![CmdUnfoldPolyline.svg](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/CmdUnfoldPolyline.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.

> [!TIP]
> ### 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 ![CursorGrey.svg](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/CursorGrey.svg)
3. You can choose to reverse the axis using ![InvertDirection.svg](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/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.

> [!CAUTION]
> Polylines to unroll are supposed to follow the axis in 2D to minimize deformations due to the projection.

> [!TIP]
> ### Practice
> 
> - [Exercise: Draw a longitudinal profile](/v1/docs/cyclone-3dr-exercise-draw-a-longitudinal-profile)