# simnibs.Msh¶

class simnibs.Msh(nodes=None, elements=None, fn=None)

class to handle the meshes. Gatters Nodes, Elements and Data

Parameters
• nodes ((optional) simnibs.msh.Nodes) – Nodes structure

• elements ((optional) simnibs.msh.Elements()) – Elements structure

• fn (str (optional)) – Name of “.msh” file to be read. Overides nodes and elements

nodes

a Nodes field

Type

simnibs.msh.Nodes

elm

A Elements field

Type

simnibs.msh.Elements

nodedata

list of NodeData filds

Type

simnibs.msh.NodeData

elmdata

list of ElementData fields

Type

simnibs.msh.ElementData

fn

name of file

Type

str

binary

wheather or not the mesh was in binary format

Type

bool

__init__(nodes=None, elements=None, fn=None)

Initialize self. See help(type(self)) for accurate signature.

Methods

 __init__([nodes, elements, fn]) Initialize self. add_element_field(field, field_name) Adds field defined in the elements add_node_field(field, field_name) Adds field defined in the nodes calc_matsimnibs(center, pos_ydir, distance) Calculate the matsimnibs matrix for TMS simulations compact_ordering(node_number) Changes the node and element ordering so that it goes from 1 to nr_nodes crop_mesh([tags, elm_type, nodes, elements]) Crops the specified tags from the mesh Generates a new mesh, with only the specified tags The nodes are also reordered elements_baricenters() Calculates the baricenter of the elements elements_volumes_and_areas() Calculates the volumes of tetrahedra and areas of triangles elm2node_matrix([elm_indices]) Calculates a sparse matrix to tranform from ElementData to NodeData Uses Superconvergent patch recovery for volumetric data. elm_node_coords([elm_nr, tag, elm_type]) Returns the position of each of the element’s nodes fields_summary([roi, fields, percentiles, …]) Creates a text summaty of the field find_closest_element(querry_points[, …]) Finds the closest node to each point in p find_corresponding_tetrahedra() Finds the tetrahedra corresponding to each triangle find_shared_nodes(tags) Finds the nodes which are shared by all given tags find_tetrahedron_with_points(points[, …]) Finds the tetrahedron that contains each of the described points using a stochastic walk algorithm fix_surface_labels() Fixels labels of surfaces fix_th_node_ordering() Fixes the node ordering of tetrahedra in-place fix_thin_tetrahedra([n_iter, step_length]) Optimize the locations of the points by moving them towards the center of their patch. fix_tr_node_ordering() Fixes the node ordering of the triangles in-place gaussian_curvature() Calculates the Gaussian curvature at each node intercept_ray(near, far) Finds the triangle (if any) that intercepts a line segment interp_matrix(pos[, out_fill, th_indices, …]) Calculates a matrix to perform interpolation y = M.dot(x) join_mesh(other) Join the current mesh with another nodes_areas() Areas for all nodes in a surface nodes_normals([smooth]) Normals for all nodes in a surface nodes_volumes_or_areas() Return the volume (volume mesh) if area (surface mesh) of all nodes Only works for ordered values of mesh and node indices open_in_gmsh() Opens the mesh in gmsh prepare_surface_tags() read_hdf5(hdf5_fn[, path, load_data]) Reads mesh information from an hdf5 file reconstruct_surfaces([tags]) Reconstruct the mhes surfaces for each label/connected component individually This function acts in-place, and will keep any surfaces already present in the mesh remove_from_mesh([tags, elm_type, nodes, …]) Removes the specified tags from the mesh Generates a new mesh, with the specified tags removed The nodes are also reordered test_inside_volume(points) Tests if points are iside the volume using the Möller–Trumbore intersection algorithm tetrahedra_quality() calculates the quality measures of the tetrahedra triangle_angles() Calculates minimum angle of the mesh triangles triangle_normals([smooth]) Calculates the normals of triangles view([visible_tags, visible_fields]) Visualize mesh in Gmsh write(out_fn) Writes out the mesh as a “.msh” file write_hdf5(hdf5_fn[, path, compression]) Writes a HDF5 file with mesh information

Attributes

 field Dictionary of fields indexed by their name