TET_MESH_DISPLAY_OPENGL
Display a Tet Mesh Using OpenGL

TET_MESH_DISPLAY_OPENGL is a C++ program which reads the name of two data files defining a tetrahedral mesh ("tet mesh"), reads the data, and displays the tet mesh using OPENGL.

The files defining the tet mesh consist of one file containing the coordinates of the points, and a second file that lists the indices of the nodes making up each tetrahedron. Either 4-node or 10-node tetrahedrons may be used.

Usage:

tet_mesh_display_opengl prefix

• prefix_nodes.txt, the node coordinates;
• prefix_elements.txt, the element definitions.

Licensing:

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

Languages:

TET_MESH_DISPLAY_OPENGL is available in a C++ version.

Related Data and Programs:

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

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

FLOOD_OPENGL, a C program which allows a user to select a region and flood it with color, using OpenGL, by Art Wetzel.

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

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

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

OPENGL, C++ programs which illustrate the use of the OpenGL graphics library;

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

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

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

TET_MESH_DISPLAY, a MATLAB program which reads a tet mesh and displays the nodes and edges using the MATLAB graphical window.

TET_MESH_ORDER4, a data directory which contains a description and examples of a tet mesh using order 4 elements.

TET_MESH_ORDER10, a directory which contains a description and examples of a tet mesh using order 10 elements.

XY_DISPLAY_OPENGL, a C++ program which reads an XY file of 2D point coordinates, and displays an image of those points using OpenGL.

XYL_DISPLAY_OPENGL, a C++ program which reads XYL information defining points and lines in 2D, and displays an image using OpenGL.

XYZ_DISPLAY_OPENGL, a C++ program which reads an XYZ file of 3D point coordinates, and displays an image of those points using OpenGL.

Reference:

1. Edward Angel,
   Interactive Computer Graphics,
   A Top-Down Approach with OpenGL,
   Addison-Wesley, 2000,
   T385.A514.
2. Renate Kempf, Chris Frazier, editors,
   OpenGL Reference Manual,
   Addison-Wesley, 1997,
   T385.O642.
3. Mason Woo, Jackie Neider, Tom Davis,
   OpenGL Programming Guide,
   Addison-Wesley, 1997,
   T385.N435.
4. Richard Wright, Michael Sweet,
   OpenGL Superbible,
   Waite Group Press, 1996,
   T385.W73.
5. http://www.opengl.org/
   The official OpenGL site.

Source Code:

• tet_mesh_display_opengl.cpp, the source code.
• tet_mesh_display_opengl.sh, commands to compile the source code.

Examples and Tests:

CUBE_ORDER4 is a cube-shaped region, which may be meshed by order-4 tetrahedrons.

• cube_order4_output.txt, the printed output in response to the command:

  
              tet_mesh_display_opengl cube_order4

• cube_order4_nodes.txt, the node file.
• cube_order4_elements.txt, the tetrahedron file.
• cube_order4.png, a PNG image of the mesh.

TWENTY_ORDER4 is a region formed by 20 random nodes.

• twenty_order4_output.txt, the printed output in response to the command:

  
              tet_mesh_display_opengl twenty_order4

• twenty_order4_nodes.txt, the node file.
• twenty_order4_elements.txt, the tetrahedron file.
• twenty_order4.png, a PNG image of the mesh.

CUBE_ORDER10 is a cube-shaped region, which may be meshed by order-10 tetrahedrons.

• cube_order10_output.txt, the printed output in response to the command:

  
              tet_mesh_display_opengl cube_order10

• cube_order10_nodes.txt, the node file.
• cube_order10_elements.txt, the tetrahedron file.
• cube_order10.png, a PNG image of the mesh.

ONEONEEIGHT_ORDER10 is a region formed by the refinement of 20 random nodes to 118 nodes (by adding the midside nodes.)

• oneoneeight_order10_output.txt, the printed output in response to the command:

  
              tet_mesh_display_opengl oneoneeight_order10

• oneoneeight_order10_nodes.txt, the node file.
• oneoneeight_order10_elements.txt, the tetrahedron file.
• oneoneeight_order10.png, a PNG image of the mesh.

List of Routines:

• MAIN is the main program for TET_MESH_DISPLAY_OPENGL.
• CH_EQI is true if two characters are equal, disregarding case.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• DISPLAY generates the graphics output.
• FILE_COLUMN_COUNT counts the columns in the first line of a file.
• FILE_EXIST reports whether a file exists.
• FILE_ROW_COUNT counts the number of row records in a file.
• I4_MAX returns the maximum of two I4's.
• I4_MIN returns the smaller of two I4's.
• I4MAT_DATA_READ reads data from an I4MAT file.
• I4MAT_HEADER_READ reads the header from an I4MAT file.
• MYINIT initializes OpenGL state variables.
• R8_MAX returns the maximum of two R8's.
• R83VEC_MAX returns the maximum value in an R83VEC.
• R83VEC_MIN returns the minimum value in an R83VEC.
• R8MAT_DATA_READ reads the data from an R8MAT file.
• R8MAT_HEADER_READ reads the header from an R8MAT file.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_R8 reads an R8 from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• S_WORD_COUNT counts the number of "words" in a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the C++ source codes.