TRIANGULATION_ORDER4
Pairs of Files Defining an Order 4 Triangulation

TRIANGULATION_ORDER4 is a data directory which contains examples of triangulation data of order 4.

Defining a triangulation requires two files:

• the node file lists the coordinates of a set of points.
• the element file lists sets of 4 node indices, forming triangles. The fourth node is the centroid.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

TRIANGULATION_DISPLAY_OPENGL a C++ program which reads files defining a 2D triangulation and displays an image using OpenGL.

TRIANGULATION_ORDER3, a data directory which contains examples of TRIANGULATION_ORDER3 files, a description of a linear triangulation of a set of 2D points, using a pair of files to list the node coordinates and the 3 nodes that make up each triangle;

TRIANGULATION_ORDER4, a dataset directory of TRIANGULATION_ORDER4 files, a linear triangulation of a set of 2D points, using a pair of files to list the node coordinates and the 4 nodes that make up each triangle;

TRIANGULATION_ORDER6, a data directory which contains examples of TRIANGULATION_ORDER6 files, a description of a quadratic triangulation of a set of 2D points, using a pair of files to list the node coordinates and the 6 nodes that make up each triangle.

TRIANGULATION_PLOT a FORTRAN90 program which creates an Encapsulated PostScript image of a triangulation.

TRIANGULATION_T3_TO_T4 a FORTRAN90 program which reads information about a 3-node triangulation and creates data defining a corresponding 4-node triangulation (vertices + centroid);

Sample Files:

BOX4 is a rectangular region.
There are 44 nodes and 24 elements.

• box4_nodes.txt, the coordinates of a 5 by 4 grid of nodes;
• box4_nodes.png, a PNG image of the nodes.
• box4_elements.txt, defines the elements.
• box4_elements.png, a PNG image of the element.
• box4_element_neighbors.txt, defines the element neighbors.
• box4_element_neighbors.png, a PNG image of the element neighbors.

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