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quat_slerp(3) Allegro manual quat_slerp(3)

quat_slerp - Version of quat_interpolate() allowing control over the rotation. Allegro game programming library.

#include <allegro.h>
void quat_slerp(const QUAT *from, const QUAT *to, float t, QUAT *out, int how);

The same as quat_interpolate(), but allows more control over how the rotation is done. The how parameter can be any one of the values:
   QUAT_SHORT  - like quat_interpolate(), use shortest path
   QUAT_LONG   - rotation will be greater than 180 degrees
   QUAT_CW     - rotate clockwise when viewed from above
   QUAT_CCW    - rotate counterclockwise when viewed from above
   QUAT_USER   - the quaternions are interpolated exactly as
                 given
   
version 4.4.2 Allegro

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