---
title: "Guided Workflow | Roundness"
slug: "cyclone-3dr-exerceise-roundness"
tags: ["Scan2Verify"]
updated: 2026-09-07T11:51:46Z
published: 2026-09-07T11:51:46Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-exerceise-roundness"
---

> ## 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.

# Guided Workflow | Roundness

Show only the mesh **Tank Mesh 1 Shell**. Select it and launch the function [Roundness](/v1/docs/cyclone-3dr-roundnessc).

The purpose is to compute sections on the shell as well as on the theoretical shape (the best cylinder) at different heights, and to compare them.

First choose the direction of the sections. They can be created perpendicularly to the axis of the best cylinder computed previously, or can be created perfectly horizontally. Choose the first option “**Perpendicular to the best cylinder axis**”.

You can choose to use tolerances for the radii according to API 653 or use your own tolerance. Here, keep the API tolerances. It is also possible to define height reference at the lowest point instead of the elevation marker.

Then, define where to create the sections. You can create sections at a regular step all over the tank, or only between given heights. You could also give a list of specific heights where to create sections, or choose the option **Click point(s)** to visually click on the tank where a section is needed.

Choose the options **With a regular step** and **All over** and give a step of **1 m**. Click **Preview** to display the resulting sections.

You can now manage the display of the sections to visualize them easily. In **Display Sections** choose the option **In a grid** to display the sections in 2D in a grid. You can then zoom on one and pan the scene to go from one to another.

You can also choose the option **Section by section** to visualize only one section at a time. Then you have other buttons in the dialog box to switch from one section to the next one.

Choose to show only the section at height 4 (4 m) and click **Edit Color**. Here, it is possible to adapt the color scale if needed, and also to magnify the deviations in order to see even the smallest ones. Set the cursor on 32 for example.

Then click **OK** to validate and come back to the previous command.

![2388b207-452d-4fb0-a85b-d95552fbe36f.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/2388b207-452d-4fb0-a85b-d95552fbe36f.png)

Magnify the deviations in order to see even the smallest ones

> [!NOTE]
> At any time, it is possible to check the option “3D" to visualize the sections in 3D on the tank.

![2da2ec9d-0d37-40be-ae16-7a38d1e49710.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/2da2ec9d-0d37-40be-ae16-7a38d1e49710.png)

Display the section in 2D and in 3D on the tank

Click **OK** to validate the results. A new folder called **Roundness** is created in the tree. It contains all the sections per height (on the tank, on the cylinder and the result of the comparison) and the corresponding points on the center axis.