triangulation_display_opengl, a C++ code which reads the name of two data files defining a triangulation, reads the data, and displays the triangulation using OpenGL.

The files defining the triangulation consist of one file containing the coordinates of the points, and a second file that lists the indices of the nodes making up each triangle. Either 3-node or 6-node triangles may be used.


triangulation_display_opengl prefix
where prefix is the common filename prefix:


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


triangulation_display_opengl is available in a C++ version.

Related Data and Programs:


CAUSTIC_OPENGL, a C++ code which computes a caustic curve and displays it using OpenGL.

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.

FERN_OPENGL, a C++ code which uses OpenGL to display the Barnsley fractal fern.

LIFE_OPENGL, a C++ code which simulates a version of John Conway's "Game of Life", displaying the results using OpenGL.

LIGHTS_OUT_OPENGL, a C++ code which sets up a "Lights Out" game and allows the user to solve it, using the OpenGL graphics window.

LISSAJOUS_OPENGL, a C++ code which computes a Lissajous figure and displays it using OpenGL.

MESH_DISPLAY_OPENGL, a C++ code which reads data defining a polygonal mesh and displays it using OpenGL.

opengl_test, C++ codes which illustrate the use of the OpenGL graphics library;

POLYGONAL_SURFACE_DISPLAY_OPENGL, a C++ code which displays a surface in 3D described as a set of polygons, using OpenGL.

ROTATING_CUBE_DISPLAY_OPENGL, a C++ code which displays a rotating color cube in 3D, using OpenGL;

SCREENSHOT_OPENGL, a C++ code which shows how a program using the OpenGL graphics library can save a screenshot of the graphics being displayed.

SPHERE_XYZ_DISPLAY_OPENGL, a C++ code which reads XYZ information defining points in 3D, and displays a unit sphere and the points, using OpenGL.

TRIANGULATION_DISPLAY, a MATLAB program which displays the nodes and elements of a triangulation on the MATLAB graphics screen;

TRIANGULATION_HISTOGRAM, a C++ code which computes histograms of data over a triangulation.

TRIANGULATION_MASK, a C++ code which takes an existing triangulation and deletes triangles and their corresponding nodes as requested by the user.

TRIANGULATION_NODE_TO_ELEMENT, a C++ code which reads files describing a set of nodes, their triangulation, and the value of one or more quantities at each node, and outputs a file that averages the quantities for each element. This operation in effect creates an "order1" finite element model of the data.

TRIANGULATION_ORDER3, a data directory which contains a description and examples of order 3 triangulations.

TRIANGULATION_ORDER6, a data directory which contains a description and examples of order 6 triangulations.

TRIANGULATION_PLOT, a C++ code which reads data defining a triangulation and creates a PostScript image of the nodes and triangles.

TRIANGULATION_QUAD, a C++ code which estimates the integral of a function over a triangulated region.


  1. Edward Angel,
    Interactive Computer Graphics, a Top-Down Approach with OpenGL,
    Addison-Wesley, 2000,
    ISBN: 0-201-38597-X,
    LC: T385.A514.
  2. Renate Kempf, Chris Frazier, editors,
    OpenGL Reference Manual,
    Addison-Wesley, 1997,
    LC: T385.O642.
  3. Mason Woo, Jackie Neider, Tom Davis,
    OpenGL Programming Guide,
    Addison-Wesley, 1997,
    LC: T385.N435.
  4. Richard Wright, Michael Sweet,
    OpenGL Superbible,
    Waite Group Press, 1996,
    LC: T385.W73.
    The official OpenGL site.

Source Code:

Last revised on 22 May 2023.