//hit_axis is vector of axis which object collided with
std::vector<sf::Vector2f>::iterator it;
    for(it = hit_axes.begin();it != hit_axes.end();it++){
        sf::Vector2f n = *it;
        sf::Vector2f comp_u = sf::Vector2f(0,0);

        if(n != sf::Vector2f(0,0)){ //because -0 * (0 / 0) = undefined
            comp_u = n * (maths::dot(dir,n) / maths::dot(n,n)); //component of hit axis in dir
        }
        sf::Vector2f comp_w = dir - comp_u;

        dir = comp_w;
    }