---
title: "Generate Patches"
slug: "cyclone-3dr-generatepatchc"
updated: 2026-09-07T11:51:53Z
published: 2026-09-07T11:51:53Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-generatepatchc"
---

> ## 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.

# Generate Patches

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

This command allows you to generate CAD surfaces from a mesh and a polyline network. The surface is made of patches fitted onto the mesh.

> [!TIP]
> ### Requirements
> 
> Select the mesh and a polyline network previously designed (polylines and/or set of polylines) and launch the command.

1. When you open the command, a pre-computation is launched. A shell composed of CAD curves and faces is computed. All the computed faces will be fitted on the selected mesh.
2. You can modify the deviation of the computed curves: select one curve in the scene, and move the slider in order to choose to be **closer** or **smoother**.
3. Inside the **Results** section, you can see:
  - The **Standard deviation** for **curves**
  - The **Max deviation** for **curves**, corresponding to the curve having the maximum standard deviation
  - The **Standard deviation** for **faces**
  - The **Max deviation** for **faces**, corresponding to the face having the maximum standard deviation

> [!TIP]
> ### Tips & Tricks
> 
> A polyline network can be obtained through different workflows:
> 
> - automatically with the command [Create Network](/v1/docs/cyclone-3dr-createnetworkc)
> - manually using all the commands creating sections on a mesh. For example, [Free Hand Section](/v1/docs/cyclone-3dr-freehandsectionc), [Single Breaking Line](/v1/docs/cyclone-3dr-singlebreakinglinec) or [Projected Polyline](/v1/docs/cyclone-3dr-projectedpolylinec)

> [!TIP]
> ### Practice
> 
> - [https://hexagon.atlassian.net/wiki/x/mVekkQo](https://hexagon.atlassian.net/wiki/spaces/RCD/pages/45393139609/Basic+Tutorial+CAD+and+Reverse+Engineering)