TET_MESH_DISPLAY_OPEN_GL
Display a Tet Mesh Using OpenGL

TET_MESH_DISPLAY_OPEN_GL is a C++ program, using double precision arithmetic, which reads the name of two data files defining a tetrahedral mesh ("tet mesh"), reads the data, and displays the tet mesh using OPEN_GL.

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_open_gl nodes.txt tetras.txt

reads the node data from nodes.txt, the tetrahedron data from tetras.txt and displays a plot of the tet mesh.

Related Data and Programs:

CVT_TET_MESH is a FORTRAN90 program which uses CVT methods to compute a tet mesh in a 3D region.

GEOMPACK3 is a FORTRAN90 library which includes a routine DTRIS3 to compute the tetrahedral mesh of a set of 3D points.

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

MATLAB includes a routine delaunay3 which can compute the tetrahedral mesh of a set of points in 3D.

OPEN_GL is used to handle the graphics display.

TABLE is the format used for the input files to TET_MESH_DISPLAY_OPEN_GL.

TABLE_TET_MESH is an interactive FORTRAN90 program for computing the tetrahedral mesh of a set of 3D points.

TEST_TET_MESH is a small FORTRAN90 library defining a few test regions for the generation of a tet mesh.

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

TET_MESH_L2Q is a FORTRAN90 executable program which converts a linear to quadratic tet mesh.

TET_MESH_TET_NEIGHBORS is a FORTRAN90 program which computes the tetrahedral adjacency information.

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

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

TET_MESH_Q2L is a FORTRAN90 executable program which converts a quadratic to linear tet mesh.

TET_MESH_QUALITY can compute quality measures for a given tetrahedral mesh. This program is available in a C++ version and a FORTRAN90 version and a MATLAB version.

TET_MESH_RCM is a FORTRAN90 executable program which takes a tet mesh and relabels the nodes to reduce the bandwidth of the corresponding adjacency matrix.

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

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_open_gl.C, the source code.
• tet_mesh_display_open_gl.csh, 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.out, the printed output in response to the command:

  
              tet_mesh_display_open_gl cube_order4_nodes.txt cube_order4_tetras.txt

• cube_order4_nodes.txt, the node file.
• cube_order4_tetras.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.out, the printed output in response to the command:

  
              tet_mesh_display_open_gl twenty_order4_nodes.txt twenty_order4_tetras.txt

• twenty_order4_nodes.txt, the node file.
• twenty_order4_tetras.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.out, the printed output in response to the command:

  
              tet_mesh_display_open_gl cube_order10_nodes.txt cube_order10_tetras.txt

• cube_order10_nodes.txt, the node file.
• cube_order10_tetras.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.out, the printed output in response to the command:

  
              tet_mesh_display_open_gl oneoneeight_order10_nodes.txt oneoneeight_order10_tetras.txt

• oneoneeight_order10_nodes.txt, the node file.
• oneoneeight_order10_tetras.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_OPEN_GL.
• 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.
• DTABLE_DATA_READ reads the data from a real TABLE file.
• DTABLE_HEADER_READ reads the header from a real TABLE file.
• FILE_COLUMN_COUNT counts the number of columns in the first line of a file.
• 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.
• I43MAT_FLIP_COLS swaps the columns of an I43MAT.
• ITABLE_DATA_READ reads data from an integer TABLE file.
• ITABLE_HEADER_READ reads the header from an integer TABLE file.
• MYINIT initializes OpenGL state variables.
• PPMA_WRITE writes the header and data for an ASCII portable pixel map file.
• PPMA_WRITE_DATA writes the data for an ASCII portable pixel map file.
• PPMA_WRITE_HEADER writes the header of an ASCII portable pixel map file.
• 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.
• 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.
• TIMESTRING returns the current YMDHMS date as a string.

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