---
title: "rotateX | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Function rotateX

-   rotateX(out: [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/), a: [ReadonlyVec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec3/), b: [ReadonlyVec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec3/), rad: number): [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/)[](#rotatex)
    
    Rotate a 3D vector around the x-axis
    
    #### Parameters
    
    -   out: [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/)
        
        The receiving vec3
        
    -   a: [ReadonlyVec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec3/)
        
        The vec3 point to rotate
        
    -   b: [ReadonlyVec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec3/)
        
        The origin of the rotation
        
    -   rad: number
        
        The angle of rotation in radians
        
    
    #### Returns [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/)
    
    out