Vec3f v; // v.x, v.y, and v.z are all set to 0.0f
Vec3f v(1.0f, 2.0f, 3.0f);
float mag = v.length(); // determines the length or magnitude of the vector
v.normalize(); // turns the vector into a unit vector (magnitude = 1)It is difficult to determine the specific package library that Vec3f belongs to as it is a commonly used data structure in many graphics and physics libraries. However, it may be found in libraries such as OpenGL, OpenCV, or Eigen.