---
title: "Spline Mask"
url: "https://help.maxon.net/c4d/en-us/Content/html/OMOGRAPH_SPLINEMASK.html"
section_path: "Create Menu > Generators > Spline Mask"
element_id: "OMOGRAPH_SPLINEMASK"
command_id: "1019396"
description: "This page covers the Spline Mask object in Cinema 4D. It performs Boolean operations — union, subtract, intersect — on flat splines, quickly producing new …"
---

# Spline Mask

> **Note:** **What is it about?**
>
> This page covers the **Spline Mask object** in **Cinema 4D**. It performs Boolean operations — union, subtract, intersect — on flat splines, quickly producing new outline shapes for logos, panels and cut-outs.

The spline mask corresponds to a [Boolean object](https://help.maxon.net/c4d/en-us/Content/html/OBOOLE.html.md) for splines. You can use it to cut out and join spline shapes, etc. This works best if the splines are flat and lie in the same plane.

A very nice tool for quickly creating new spline shapes. You can place the spline mask object wherever you would place a normal spline, for example:

- Extrude object
- Sweep object etc.

In addition, any (closed) spline shape can be displayed polygonally.

A spline mask can be converted into a spline or a polygon object (if **Create Caps** is activated) using the **Make Editable** or **Current State to Object** command.

More than 2 splines can be assigned to a spline mask. The target spline is always the first one under the spline mask object:

![Image: 039768.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/039768.jpg)\
The first sub-object of the spline mask is always the target spline (here **Mode** A minus B). All other splines are cut out of the target spline here.

In some modes - such as the subtraction modes - the target spline is important, in others (e.g. Union) it is not, where the order of the subordinate splines does not matter.

> **Tip:** Note:If unexpected effects such as uncleanly cut shapes occur, change the spline interpolation types of the splines involved to **Natural**, for example, and increase the intermediate points.

> **Tip:** 2. Note:All Boolean modes of the spline mask are also available as separate commands that can act on selected splines (then without a "detour" via a generator).

# Example

In the following scene, a few simple basic spline objects are combined using the spline mask.

[Video: 2026-0_spline_mask_generator_01_.mp4](https://help.maxon.net/c4d/en-us/Content/Resources/Images/2026-0_spline_mask_generator_01_.mp4)

[![Image: halvar.png](https://help.maxon.net/c4d/en-us/Content/Resources/Images/halvar.png)](https://help.maxon.net/c4d/en-us/Content/Resources/Scenes/2026-0_spline_mask_generator_01_.c4d)