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node file

First line: <# of vertices> <dimension (must be 2)> <# of attributes> <# of boundary markers (0 or 1)>
Remaining lines: <vertex #> <x> <y> [attributes] [boundary marker]
  • Blank lines and comments prefixed by `#' may be placed anywhere.
  • Vertices must be numbered consecutively, starting from one or zero.
  • The attributes, which are typically floating-point values of physical quantities (such as mass or conductivity) associated with the nodes of a finite element mesh, are copied unchanged to the output mesh.
  • If -q, -a, -u, or -s is selected, each new Steiner point added to the mesh will have quantities assigned to it by linear interpolation.
  • If the fourth entry of the first line is `1', the last column of the remainder of the file is assumed to contain boundary markers.
  • Boundary markers are used to identify boundary vertices and vertices resting on PSLG segments.
  • The .node files produced by Triangle contain boundary markers in the last column unless they are suppressed by the B switch.