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       quat_mul - Multiplies two quaternions. Allegro game programming library.


       #include <allegro.h>

       void quat_mul(const QUAT *p, const QUAT *q, QUAT *out);


       Multiplies  two quaternions, storing the result in out. The resulting quaternion will have
       the same effect as the combination of p and q, ie.  when applied to a point, (point * out)
       =  ((point  *  p) * q). Any number of rotations can be concatenated in this way. Note that
       quaternion multiplication is not commutative, ie. quat_mul(p, q) != quat_mul(q, p).