---
name: "quat_interpolate"
section: "3alleg4"
platform: "linux"
package: "allegro4-doc"
version: "2:4.4.3.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/quat_interpolate/3alleg4"
---

# quat\_interpolate(3alleg4)

Constructs a quaternion representing a rotation between from and to. Allegro game programming library.

## NAME

quat\_interpolate - Constructs a quaternion representing a rotation between from and to. Allegro game programming library.

## SYNOPSIS

**#include \<allegro.h\>**

**void quat\_interpolate(const QUAT \*from, const QUAT \*to, float t, QUAT \*out);**

## DESCRIPTION

Constructs a quaternion that represents a rotation between from and to.  The argument t can be anything between 0 and 1 and represents where  between from and to the result will be. 0 returns from, 1 returns to, and  0.5 will return a rotation exactly in between. The result is copied to  out. This function will create the short rotation (less than 180 degrees)  between from and to.

## SEE ALSO

**exquat**(3alleg4)