---
title: "Basic Tutorial | Compute inspection between a surface and a cloud"
slug: "cyclone-3dr-excompute-inspection-between-a-surface-and-a-cloud"
updated: 2026-09-07T11:51:31Z
published: 2026-09-07T11:51:31Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-excompute-inspection-between-a-surface-and-a-cloud"
---

> ## 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 inspection between a surface and a cloud

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

Show only the cloud **Aligned Dam** and the Mesh **Theoretical Dam (good CS)**. Select the mesh first, then the cloud with **CTRL** pressed, and go to [Inspect Cloud vs Mesh](/v1/docs/cyclone-3dr-compareinspectcloudc).

Choose to **apply colors** on the reference.

> [!WARNING]
> The option **Force projection direction** corresponds to a 2D inspection. It will project all the points along a given direction (for example Z), while the 3D inspection will look for the closest point on the reference in 3D. In most cases, we compute 3D inspection, except when deviations are only required in one direction.

Click **Preview** to compute the inspection. Click **Edit color** to edit thresholds and colors (see [Adjust inspection colors](/v1/docs/cyclone-3dr-exercice-adjust-inspection-colors) for more information). Validate the colors by clicking **OK**. Click **OK** again to validate the final result.

A new object called **Comparison Theoretical Dam (good CS) / Aligned Dam** has been added in a group named Compare Inspect 2.

![ca62491c-393b-46e2-bf4d-1ab63e5241e1.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/ca62491c-393b-46e2-bf4d-1ab63e5241e1.png)

Comparison between a cloud and a mesh