---
title: "slerp | 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 slerp

-   slerp(out: [quat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.quat/), a: [ReadonlyQuat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyQuat/), b: [ReadonlyQuat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyQuat/), t: number): [quat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.quat/)[](#slerp)
    
    Performs a spherical linear interpolation between two quat
    
    #### Parameters
    
    -   out: [quat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.quat/)
        
        the receiving quaternion
        
    -   a: [ReadonlyQuat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyQuat/)
        
        the first operand
        
    -   b: [ReadonlyQuat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyQuat/)
        
        the second operand
        
    -   t: number
        
        interpolation amount, in the range \[0-1\], between the two inputs
        
    
    #### Returns [quat](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.quat/)
    
    out