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quat_slerp(3alleg4) Allegro manual quat_slerp(3alleg4)


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

version 4.4.3 Allegro