---
title: "Basic Tutorial | Compute best shapes from clouds and polylines"
slug: "cyclone-3dr-ex-compute-best-shapes-from-clouds-and-polylines"
updated: 2026-09-07T11:51:46Z
published: 2026-09-07T11:51:46Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-ex-compute-best-shapes-from-clouds-and-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 | Compute best shapes from clouds and polylines

Beside the creation of geometric shapes by clicking points or by directly defining its parameters, you can extract a shape by fitting it to existing objects (meshes, clouds, points, other shapes...).

The following exercise will illustrate how to extract shapes and their properties from potentially measured point clouds.

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

Show only the folder **BestShapes**. then compute each corresponding best feature. For instance, select the line and execute the command [Best Line](/v1/docs/cyclone-3dr-bestlinec):

- You can eliminate noisy points by using the parameter **Eliminate worst points**: eliminate 10 points.
- You can lock some parameters: lock the direction to Z.

You can also try the equivalent command for all the basic shapes.

![image2019-9-16_16-13-41.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/image2019-9-16-16-13-41.png)

Best shapes computed from point clouds or polylines