---
title: "transformMat4 | 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 transformMat4

-   transformMat4(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/), m: [ReadonlyMat4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyMat4/)): [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/)[](#transformmat4)
    
    Transforms the vec3 with a mat4. 4th vector component is implicitly '1'
    
    #### Parameters
    
    -   out: [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/)
        
        the receiving vector
        
    -   a: [ReadonlyVec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyVec3/)
        
        the vector to transform
        
    -   m: [ReadonlyMat4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyMat4/)
        
        matrix to transform with
        
    
    #### Returns [vec3](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.vec3/)
    
    out