---
title: "Clash"
slug: "cyclone-3dr-clashc"
updated: 2026-09-07T11:51:46Z
published: 2026-09-07T11:51:46Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-clashc"
---

> ## 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.

# Clash

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

This command detects clashes between surfacic objects and clouds and generates report data.

> [!TIP]
> ### Requirements
> 
> Select meshes, surfacic features, CAD objects or BIM objects and clouds. Then launch the command.
> 
> You can also reload a clash project by selecting a clash analysis project or by clicking the corresponding Play button in the treeview.

1. Set clash detection parameters:
  1. Points closer than the **Tolerance** value are considered as clashes.
  2. **Cluster distance** allows merging nearby clashes into one according to a given distance.
  3. Check **Analyze per sub-element** to make individual analysis of sub-elements which are included in a compound or a BIM object.

Otherwise, you can [ungroup / group](/v1/docs/cyclone-3dr-groupcadc) CAD elements or [edit](/v1/docs/cyclone-3dr-importcadfilec) the BIM objects prior to the command.
  4. After a computation, click **Reset** to modify these settings: note previous results will be lost since potential clashes will be different.
2. When computation is done, the user interface guides you to classify potential clashes to create a report. Results will be displayed in a table:
  1. You can filter insignificant clashes using their number of points (**Filter clashes**).
  2. Then browse the list:
    1. Each object can have several potential clash clusters: each one has to be classified. Use **SPACE** shortcut to change the status or use the corresponding checkbox. Use the bulb to show/hide the current object.
    2. Optionally, add a comment to describe the clash.
    3. In left view, you will see the corresponding object and the points in clash. Check **Navigate to current clash** to zoom automatically on the current clash.
    4. In right view, you can visualize the object in its environment. Clash areas are represented by a colored box (the color, like a traffic light, depends on the current classification).
    5. A **Limit box** is available to focus on each area. It is advised to customize it for each unknown or clash cluster. Click **Update Clash View**: the right scene will be used in the report.
    6. Click **Go to Clash View**: the right scene will be updated to show you what view is currently stored. The default view is always a top view.
3. Optionally, click [**Export BCF**](/v1/docs/cyclone-3dr-bcfbimcollaborationformat). A file with one issue per cluster will be created, it will contain:
  1. Title: object name and clash number
  2. Assignee: the given name.
  3. Description: the clash status and the comment
  4. Type: "Clash" (not editable through UI)
  5. Priority: "Medium" (not editable through UI)
  6. Author: "Cyclone 3DR" (not editable through UI)
  7. The recorded viewset

> [!WARNING]
> ### Notes
> 
> It is highly recommended not to modify Clash Analysis folder nevertheless objects can be renamed safely.

> [!TIP]
> ### Practice
> 
> - [Workflow: Make a clash analysis report](/v1/docs/cyclone-3dr-exercise-make-a-clash-analysis-report)

## Related

- [Cyclone 3DR | BIM Analyses overview](/cyclone-3dr-cyclone-3dr-which-bim-analysis-feature-to-use.md)
- [Guided Workflow | Make a Clash Analysis Report](/cyclone-3dr-exercise-make-a-clash-analysis-report.md)