Plot a Triangulation

TRIANGULATION_DISPLAY is a MATLAB program which plots a triangulation.

TRIANGULATION_DISPLAY reads one file listing the nodes, and a second file consisting of groups of 3 or 6 nodes that make up the elements, and creates an Encapsulated PostScript image of the triangulation.

If a third file is available, listing the element neighbors of each element, then the program will read that file, and can display that information as well.


triangulation_display ( 'prefix', node_vis, element_vis, (neighbor_vis) )
where 'prefix' is the common prefix for the node and element files, and will also be used to name the output file: and node_vis is an integer defining the node visibility: and element_vis is an integer defining the element visibility: and neighbor_vis is an integer defining the element neighbor visibility:


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


TRIANGULATION_DISPLAY is available in a MATLAB version.

Related Data and Programs:

FEM_BASIS_T3_DISPLAY, a MATLAB program which displays a basis function associated with a linear triangle ("T3") mesh.

FEM_BASIS_T6_DISPLAY, a MATLAB program which reads a quadratic triangle mesh and displays any associated basis function.

GRIDLINES, a MATLAB library which gives the user more control over drawing gridlines on a graph than the builtin "grid on" command.

MESH_DISPLAY, a MATLAB program which reads data defining a polygonal mesh and displays it, with optional numbering.

MPAS_GRID_DISPLAY, MATLAB programs which can read an MPAS NETCDF grid file and display the primary polygonal mesh or the dual triangular mesh.

PLY_DISPLAY, a MATLAB program which displays an image of a 3D graphics file in PLY format;

TRI_SURFACE_DISPLAY, a MATLAB program which reads data defining a triangular mesh of a 3D surface and displays it.

TRIANGLE_DISPLAY, a MATLAB program which displays the nodes and elements of a triangulation on the MATLAB graphics screen, assuming the data has been stored in NODE and ELE files by the TRIANGLE program.

TRIANGULATION_DISPLAY_OPENGL, a C++ program which reads files defining a triangulation and displays an image using Open GL.

TRIANGULATION_PLOT, a MATLAB program which plots a triangulation as an Encapsulated PostScript (EPS) file.

TRIANGULATION_SVG, a MATLAB program which creates an SVG image of a triangulation, which can be displayed by an web browser.


  1. Marc deBerg, Marc Krevald, Mark Overmars, Otfried Schwarzkopf,
    Computational Geometry,
    Springer, 2000,
    ISBN: 3-540-65620-0,
    LC: QA448.D38.C65.
  2. Joseph ORourke,
    Computational Geometry,
    Second Edition,
    Cambridge, 1998,
    ISBN: 0521649765,
    LC: QA448.D38.

Source Code:

Examples and Tests:

BOX4 is an order 4 triangulation.

CIRCLE is a circular region, triangulated using order 3 elements.

ELBOW3 is an elbow-shaped region, triangulated using order 3 elements.

ELL3 is an order 3 triangulation of a set of nodes in an L-shaped region.

GREENLAND is a triangulation of Greenland, using 33,343 nodes and 64,125 elements of order 3 elements. The image is too dense to display in full, so MATLAB's "zoom" facility was used to display a small portion of the mesh.

HEX_HOLES3 puts a set of nodes into the double hexagonal hole region using CVT techniques, and creates an order 3 triangulation using TABLE_DELAUNAY.

IRREG6 is an order 6 triangulation.

LAKE3 uses constrained CVT methods to place nodes inside and on the boundary of the problem 14 triangulation region, a lake with an island. An order 3 triangulation is used.

You can go up one level to the MATLAB source codes.

Last revised on 30 August 2011.