XYZF_DISPLAY_OPENGL
Display 3D Points and Faces Using OpenGL

XYZF_DISPLAY_OPENGL is a C++ program which reads XYZF information defining 3D points and faces, and displays an image using OPENGL.

The program displays the data, and slowly rotates it.

SXYZ_VORONOI, which computes the Voronoi diagram for a set of points on a sphere, is an example of the programs whose output can be displayed by XYZF_DISPLAY_OPENGL.

Usage:

xyzf_display_opengl prefix

prefix is the common file prefix,

Licensing:

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

Languages:

XYZF_DISPLAY_OPENGL is available in a C++ version.

Related Data and Programs:

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

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;

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

SPHERE_VORONOI, a FORTRAN90 library which reads an XYZ file of 3D points on the unit sphere, and computes and plots Delaunay triangulations and Voronoi diagrams.

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.

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

XYF_DISPLAY_OPENGL, a C++ program which reads XYF information defining points and faces in 2D, and displays an image using OpenGL.

XYZ, a data directory which contains some examples of 3D pointsets.

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

XYZF, a data directory which contains some examples of sets of 3D points and faces.

XYZL, a data directory which contains some examples of sets of 3D points and lines.

XYZL_DISPLAY_OPENGL, a C++ program which reads XYZL information defining points and lines in 3D, and displays an image in a MATLAB graphics window.

Reference:

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,
   Fourth Edition,
   Addison-Wesley, 2004,
   ISBN: 032117383X,
   LC: T385.O642
3. Mason Woo, Jackie Neider, Tom Davis,
   OpenGL Programming Guide,
   Addison-Wesley, 1997,
   ISBN: 0-201-46138-2,
   LC: T385.N435
4. Richard Wright, Michael Sweet,
   OpenGL Superbible,
   Third Edition,
   Sams, 2004,
   ISBN: 0672326019,
   LC: T385.W73
5. http://www.opengl.org/
   The official OpenGL site.

Source Code:

• xyzf_display_opengl.cpp, the source code.

Examples and Tests:

• sphere.xyz, the vertices of a Voronoi diagram on the unit sphere.
• sphere.xyzf, the vertices that must be joined to make the faces.
• sphere.png, a PNG image of the screen generated by Open GL.

List of Routines:

• MAIN is the main program for XYZF_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.
• I4VEC_MAX returns the value of the maximum element in an I4VEC.
• I4VEC_MIN returns the value of the minimum element in an I4VEC.
• MOUSE determines the response to mouse input.
• MYINIT initializes OpenGL state variables dealing with viewing and attributes.
• MYRESHAPE determines the window mapping.
• R8_MAX returns the maximum of two R8's.
• R8_MIN returns the minimum 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.
• SPIN_IMAGE adjusts the angle of rotation and redisplays the picture.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• XYZ_DATA_PRINT prints the data for an XYZ file.
• XYZ_DATA_READ reads the data in an XYZ file.
• XYZ_HEADER_PRINT prints the header of an XYZ file.
• XYZ_HEADER_READ reads the header of an XYZ file.
• XYZF_DATA_PRINT prints the data of an XYZF file.
• XYZF_DATA_READ reads the data in an XYZF file.
• XYZF_HEADER_PRINT prints the header of an XYZF file.
• XYZF_HEADER_READ determines the number of face items in an XYZF file.

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