Provided by: allegro4-doc_4.4.2-13_all

**NAME**

quat_mul - Multiplies two quaternions. Allegro game programming library.

**SYNOPSIS**

#include<allegro.h>voidquat_mul(constQUAT*p,constQUAT*q,QUAT*out);

**DESCRIPTION**

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).