TRIANGULATION_BOUNDARY_NODES is a FORTRAN90 program which analyzes the triangulation of a region, and identifies each boundary node with the label "1".
Either a 3-node or 6-node triangulation may be used.
Although this boundary information is useful, it would be more useful to divide the boundary nodes up, if the boundary consists of more than one connected segment. Moreover, it would also be useful to report the sequence of nodes necessary to trace out a connected segment of the boundary. I imagine I will come back to work on those projects later!
triangulation_boundary_nodes prefixwhere prefix is the common filename prefix:
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
TRIANGULATION_BOUNDARY_NODES is available in a C++ version and a FORTRAN90 version and a MATLAB version.
MESH_TO_XML, a FORTRAN90 program which reads information defining a 1D, 2D or 3D mesh, namely a file of node coordinates and a file of elements defined by node indices, and creates a corresponding XML file for input to DOLFIN or FENICS.
TABLE_DELAUNAY, a FORTRAN90 program which triangulates a set of nodes whose coordinates are stored in a file.
TRIANGLE, a C program which computes a triangulation of a geometric region.
TRIANGULATION, a FORTRAN90 library which carries out various operations on order 3 ("linear") or order 6 ("quadratic") triangulations.
TRIANGULATION_CORNER, a FORTRAN90 program which patches triangulations so that no triangle has two sides on the boundary.
TRIANGULATION_DELAUNAY_DISCREPANCY, a FORTRAN90 program which measures the amount by which a triangulation fails the local Delaunay test;
TRIANGULATION_DISPLAY_OPENGL, a C++ program which reads files defining a triangulation and displays an image using Open GL.
TRIANGULATION_HISTOGRAM, a FORTRAN90 program which computes histograms of data over a triangulation.
TRIANGULATION_L2Q, a FORTRAN90 program which reads data defining a 3-node triangulation and generates midside nodes and writes out the corresponding 6-node triangulation.
TRIANGULATION_MASK, a FORTRAN90 program which takes an existing triangulation and deletes triangles and their corresponding nodes as requested by the user.
TRIANGULATION_ORDER3, a directory which contains a description and examples of order 3 triangulations.
TRIANGULATION_ORDER6, a directory which contains a description and examples of order 6 triangulations.
TRIANGULATION_ORIENT, a FORTRAN90 program which reads data defining a triangulation, makes sure that every triangle has positive orientation, and if not, writes a corrected triangle file.
TRIANGULATION_PLOT, a FORTRAN90 program which reads data defining a triangulation and creates a PostScript image of the nodes and triangles.
TRIANGULATION_Q2L, a FORTRAN90 program which reads data defining a 6-node triangulation, and subdivides each triangle into 4 3-node triangles, writing the resulting triangulation to a file.
TRIANGULATION_QUAD, a FORTRAN90 program which estimates the integral of a function over a triangulated region.
TRIANGULATION_QUALITY, a FORTRAN90 program which reads data defining a triangulation and computes a number of quality measures.
TRIANGULATION_RCM, a FORTRAN90 program which reads data defining a triangulation, determines an ordering of the nodes that will reduce the bandwidth of the adjacency matrix, and writes the new triangulation information to a file.
TRIANGULATION_REFINE, a FORTRAN90 program which reads data defining a triangulation, replaces each triangle by four congruent smaller ones, and writes the new triangulation information to a file.
TRIANGULATION_TRIANGLE_NEIGHBORS, a FORTRAN90 program which reads data defining a triangulation, determines the neighboring triangles of each triangle, and writes that information to a file.
ELBOW is a curved region, looking like an elbow, that lies inside the unit square. It is triangulated using order 3 triangles. There are 320 nodes and 568 triangles. There are 66 nodes on the boundary.
LAKE is an irregular lake-shaped region with an "island". It is triangulated using order 3 triangles.
You can go up one level to the FORTRAN90 source codes.