public Quaterniond set(Quaternionfc q) {
        x = q.x();
        y = q.y();
        z = q.z();
        w = q.w();
        return this;
    }
public Quaterniond set ( Quaternionfc q ) { x = q . x ( ) ; y = q . y ( ) ; z = q . z ( ) ; w = q . w ( ) ; return this ; }
Set this quaternion to be a copy of q.

@param q
the {@link Quaternionfc} to copy
@return this