---
title: "Join 2 Contours"
slug: "cyclone-3dr-join2contoursc"
updated: 2026-09-07T11:51:53Z
published: 2026-09-07T11:51:53Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-join2contoursc"
---

> ## 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.

# Join 2 Contours

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

This command creates a mesh from two contours (polyline or hole border). You can adjust tangency and surface curvature.

> [!TIP]
> ### Requirements
> 
> No selection is required to launch the command.

1. Click 2 contours in the 3D scene. A contour can be a polyline or a hole border of a mesh.
2. If you don't want to use the complete contour, you can make a restriction for each contour by clicking on the corresponding **Restrict** button. You will have to select the 2 extremities of the restriction, and a third point to define which part of the polyline you want to keep. Then press **Enter** to validate, **Delete** to delete a point or **Escape** to cancel the restriction creation.
3. Choose a **tangency departure mode**:

| ![tangency0.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/tangency0.png) | **None (default)** If there is no tangency condition on both sides, the junction has the same topology as a cylinder. |
| --- | --- |
| ![tangency0.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/tangency0.png) | **To the surface** The junction will have a departure tangent to the surface (no angle between them). Available only if the contour is a hole border of a surface. |
| ![tangency2.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/tangency2.png) | **Inside the contour** The junction will have a departure along the tangent inside the contour best plane. |
| ![tangency3.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/tangency3.png) | **Outside the contour** The junction will have a departure along the tangent outside the contour best plane. |
| ![tangency4.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/tangency4.png) | **Perpendicular to contour** The junction will have a departure along the tangent perpendicular to the contour best plane. |
4. Edit the **Tension** to adjust the shape in the middle of the junction.
5. The number of triangles in the mesh is automatically calculated according to the 2 contours:

But you can modify the default **Number of points between contours**. The minimum points required to build the mesh is 4 and the maximum is 999.
  - If you have selected one or two hole border(s): triangles will have the same size as existing meshes.
  - I not, triangle edges will have the same length as contour segments.
6. Click on **Triangle reorganization** to modify triangles to follow the local curvature.
7. Select **Sew** option to merge the junction and the optional meshes.