MultiTracker is a test program accompanying Multimaterial Mesh-Based Surface Tracking, Da, F., Batty, C., and Grinspun, E. 2014, ACM Trans. on Graphics (SIGGRAPH 2014), including the multimaterial mesh-based surface tracking library LosTopo. This program is built by standard procedures using CMAKE (http://www.cmake.org). The following external libraries are required: Eigen (http://eigen.tuxfamily.org) OpenGL and GLUT (http://www.opengl.org/resources/libraries/glut/) LAPACK (http://www.netlib.org/lapack/) Running the executables without command line arguments will display usage information. All the data files for testing are located in the assets folder.