public Vector2f normalizedPositiveY(Vector2f dir) {
        dir.x = -m10;
        dir.y =  m00;
        return dir;
    }
public Vector2f normalizedPositiveY ( Vector2f dir ) { dir . x = - m10 ; dir . y = m00 ; return dir ; }
/* (non-Javadoc)
@see org.joml.Matrix3x2fc#normalizedPositiveY(org.joml.Vector2f)