// Összeadás
    inline void operator+= (const Vec3& other)
    {v[0]+=other.v[0]; v[1]+=other.v[1]; v[2]+=other.v[2];}
    inline Vec3 operator+ (const Vec3& other) const
    {return Vec3(v[0]+other.v[0], v[1]+other.v[1], v[2]+other.v[2]);}

    // Kivonás
    inline void operator-= (const Vec3& other)
    {v[0]-=other.v[0]; v[1]-=other.v[1]; v[2]-=other.v[2];}
    inline Vec3 operator- (const Vec3& other) const
    {return Vec3(v[0]-other.v[0], v[1]-other.v[1], v[2]-other.v[2]);}