---
title: "Arctangent"
url: "https://help.maxon.net/c4d/en-us/Content/html/COM_REDSHIFT3D_REDSHIFT4C4D_NODES_CORE_RSMATHATAN.html"
section_path: "The Node Editor > Redshift Nodes > Redshift Math Nodes > Math Float Nodes > Arctangent"
element_id: "COM_REDSHIFT3D_REDSHIFT4C4D_NODES_CORE_RSMATHATAN"
description: "This page covers the Arctangent node of the Redshift renderer in Cinema 4D. It returns the arc-tangent of its input — used to derive angles from slopes or …"
---

# Arctangent

> **Note:** **What is it about?**
>
> This page covers the **Arctangent node** of the Redshift renderer in **Cinema 4D**. It returns the arc-tangent of its input — used to derive angles from slopes or ratios within procedural shading.

Returns the arc-tangent of *Input*. When *Radians* is selected, the output range will be between -PI/2 and PI/2, otherwise -90 and 90 degrees.