debian man page for quat_interpolate

quat_interpolate(3alleg4)					  Allegro manual					 quat_interpolate(3alleg4)

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)

Allegro 							   version 4.4.2					 quat_interpolate(3alleg4)