Graph based fiber tracking tailored for human heart. We consider a global approach 1) the tracking results are defined by the minimum of a function that takes into account all nodes and edges of graph, 2) the minimization of the energy function is designed to reach the global minima (Simulated annealing or Stochastic Continuation). Another method is implemented in order to compare our method to a streamline. The library is coded in C/C++, it requires pthread (POSIX) and gdcm