public Vector3d positiveZ(Vector3d dir) {
        dir.x = m10 * m21 - m11 * m20;
        dir.y = m20 * m01 - m21 * m00;
        dir.z = m00 * m11 - m01 * m10;
        return dir.normalize(dir);
    }
public Vector3d positiveZ ( Vector3d dir ) { dir . x = m10 * m21 - m11 * m20 ; dir . y = m20 * m01 - m21 * m00 ; dir . z = m00 * m11 - m01 * m10 ; return dir . normalize ( dir ) ; }
/* (non-Javadoc)
@see org.joml.Matrix3dc#positiveZ(org.joml.Vector3d)