TRIANGULATION_T3_TO_T4 is a FORTRAN90 program which reads information describing a triangulation of a set of points using 3-node "T3" triangles, and creates a 4-node "T4" triangulation.
The same number of triangles are used, but each triangle is given one extra node at the centroid. The coordinates of these nodes are determined by averaging the coordinates of the vertices of the triangles.
The input and output files use the simple TABLE format; comment lines begin with a "#" character. Otherwise, each line of the file contains one set of information, either the coordinates of a node (for a node file), or the indices of nodes that make up a triangle, (for a triangle file).
The input file prefix_nodes.txt contains the node information for the 3-node triangulation. Each data line contains the X and Y coordinates of a single node.
The input file prefix_elements.txt contains the triangle information for the 3-node triangulation. Each line contains the indices of three nodes that form a triangle, in counterclockwise order.
The output file prefix_t4_nodes.txt contains the node information for the 4-node triangulation. It begins with the node information from prefix_nodes.txt, followed by the coordinates of the new nodes.
The output file prefix_t4_triangles.txt contains the triangle information for the 4-node triangulation. There are exactly as many triangles as before, but now each triangle uses four nodes. Each line of the file contains the indices of 4 nodes that form the triangle. The first three indices are the vertices, in counterclockwise order. The fourth index is the centroid node..
triangulation_t3_to_t4 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_T3_TO_T4 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 computes the triangulation of 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_BOUNDARY_NODES, a FORTRAN90 program which reads data defining a triangulation, determines which nodes lie on the boundary, and writes their coordinates to a file.
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 adds midside nodes to create a 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_ORDER4, a directory which contains a description and examples of order 4 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_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.
EXAMPLE is a simple set of example data:
You can go up one level to the FORTRAN90 source codes.