The gzip tar files of the ventricular anatomy models uncompress to plain text files containing regular grids of rectangular Cartesian vector fields representing local myofiber orientations. These vectors have been interpolated at a resolution of 0.25×0.25×0.25 mm from finite element models fitted using the Continuity software to detailed anatomic measurements from rabbit (1) or dog (2) left and right ventricles. Vectors at grids points outside the ventricular walls have zero values. For the rabbit model, there is also a file containing boundary vectors pointing from internal myocardial grid points to epicardial and endocardial boundaries in the direction of the surface outward normals. These data sets have been generated from the finite element models described in the publications below for those researchers who use finite difference methods instead of finite element methods. Users of Continuity do not need these regular grid files, which were generated using an old version of Continuity. It does not appear that all of the computations needed to generate these grids are currently supported in Continuity, but it wouldn’t be hard to put them back in, so if you find yourself needing to generate more highly resolved or different data, then let us know.
Vetter FJ , McCulloch AD (1998) Three-dimensional analysis of regional cardiac function: a model of rabbit ventricular anatomy. Progress in Biophysics and Molecular Biology 69(2-3): 157-183. doi:10.1016/S0079-6107(98)00006-6
Nielsen PMF, Le Grice IJ, Smaill BH , Hunter PJ (1991) Mathematical model of geometry and fibrous structure of the heart. Am J Physiol Heart Circ Physiol 260: H1365-H1378.