#includeusing namespace Eigen; Vector3d z(1.0, 2.0, 3.0);
double x = z.x(); double y = z.y(); double z = z.z();
Vector3d a(1.0, 2.0, 3.0); Vector3d b(4.0, 5.0, 6.0); double dotProduct = a.dot(b);This code creates two Vector3d objects a and b and calculates their dot product using the dot() method. The result is stored in the dotProduct variable. In conclusion, the Vector3 class in C++ is a part of the Open3D package library that provides support for 3D data processing and visualization. It allows you to create, manipulate, and perform operations on 3D vectors with ease.