> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.sayduck.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Custom Text

**Custom 3D text** adds a 3D text field with options like **Text**, **Size** and **Position**. This text field can be updated real-time using the 3D viewer API. 

![](https://storage.crisp.chat/users/helpdesk/website/cae6f284ce714800/3dcustomtextndbfru1tcrff31pchv_zeapg4.png)

### Update Custom text using the Viewer API

The Custom text can be updated on the fly using the Viewer API. 

For more information, check out [API Documentation](/en/article/3d-viewer-api-documentation-1ftbxnx/#1-3d-text-troika-three-text)