public Quaternionf conjugate(Quaternionf dest) {
        dest.x = -x;
        dest.y = -y;
        dest.z = -z;
        dest.w = w;
        return dest;
    }
public Quaternionf conjugate ( Quaternionf dest ) { dest . x = - x ; dest . y = - y ; dest . z = - z ; dest . w = w ; return dest ; }
/* (non-Javadoc)
@see org.joml.Quaternionfc#conjugate(org.joml.Quaternionf)