---
title: "From Polyline"
slug: "cyclone-3dr-cadcurvefrompolylinec"
updated: 2026-09-07T11:51:31Z
published: 2026-09-07T11:51:31Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-cadcurvefrompolylinec"
---

> ## 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.

# From Polyline

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

This command computes CAD curve(s) according to polylines.

> [!TIP]
> ### Requirements
> 
> Select one or several polylines and launch the command.

---

1. To compute a CAD curve based on polylines, 3 **methods** are available:
  1. **Tolerance**: the software computes the best curve to respect the maximum tolerance between the polyline and the curve.
  2. **Number of control points**: you can define the number of control points with the slider. In this mode, the deviation between the polyline and the curve is not managed.
  3. **Auto**: the software computes the best curve without any other user input.
2. Give the **Extremities Constraints** of the curve (*options are displayed when the polyline is not closed*)
  1. **None:** no constraint on extremities.
  2. **Position:** keep the position of the extremity.
  3. **Tangency:** keep the position of the extremity and apply the tangency on the extremity.