---
title: "Scalar User Data"
url: "https://help.maxon.net/r3d/katana/en-us/Content/html/Scalar%2BUser%2BData.html"
section_path: "Shaders > Attributes Shaders > Scalar User Data"
description: "Attribute scalar data can be stored per object or per point on a point cloud. This shader node gives you access to that attribute data, facilitating …"
---

# Scalar User Data

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# Scalar User Data

## Introduction

Attribute scalar data can be stored per object or per point on a point cloud. This shader node gives you access to that attribute data, facilitating object or point shading variation without requiring different materials.

> **Important:** User Data does not work with volume shading.

Redshift 2025.4 and newer support color and scalar per-vertex attributes on hair primitives. These attributes are automatically extracted and made available in shaders using the Scalar User Data node.

## Parameters

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| ![Image: image2017-10-5_12-6-569655.png](https://help.maxon.net/r3d/katana/en-us/Content/Resources/Images/image2017-10-5_12-6-569655.png) |

### Attribute Name

The name of the user attribute assigned to the object or point cloud.

### Default

This is the value that will be output by the shader if the attribute is not found on the object or point cloud.