---
title: "Basic Tutorial | Chain/group polylines"
slug: "cyclone-3dr-exercise-chain-group-polylines"
updated: 2026-09-07T11:51:38Z
published: 2026-09-07T11:51:38Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-exercise-chain-group-polylines"
---

> ## 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.

# Basic Tutorial | Chain/group polylines

Polylines can be automatically chained together by computing new segments between unconnected points.

> [!TIP]
> Open the file **SectionsBuildingPlan.3dr** ([download](https://www.cyclone3dr.com/download_helper.php?File=Cyclone3DRSampleData/SectionsBuildingPlan.3dr)).

You can chain the polylines of the group **Lines to chain**. Select the polylines and go to [Chain Polylines](/v1/docs/cyclone-3dr-chainpolylinesc). Uncheck all the options.

![image2019-9-16_11-37-29.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/image2019-9-16-11-37-29.png)

Polylines to chain

![76ea387f-6102-4501-ad3f-b52ebebfeb0d.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/76ea387f-6102-4501-ad3f-b52ebebfeb0d.png)

Automatic chaining of polylines

> [!WARNING]
> ### Note
> 
> - Polylines can also be grouped in a set of polylines. After creating the planar sections on this file ([Exercise: Create planar sections on a mesh (extract contour lines)](/v1/docs/cyclone-3dr-ex-create-planar-sections-on-a-mesh-extr-contour)), we could group the polylines and create one set of polylines per elevation.
> - A set of polylines can always be exploded into individual polylines by using [Ungroup Polylines](/v1/docs/cyclone-3dr-ungrouppolylinesc).