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XYZ_DISPLAY_OPENGL\ Display 3D Points Using OpenGL {#xyz_display_opengl-display-3d-points-using-opengl align=”center”} ==============================

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XYZ_DISPLAY_OPENGL is a C++ program which reads the name of a data file containing a list of 3D point coordinates, reads the data, and displays the points using OPENGL.

The program displays the data, and slowly rotates it.

Usage: {#usage align=”center”}

xyz_display_opengl data.txt

where

• data.txt is a file containing a list of the XYZ coordinates of the points to plot.

The program will open a window and display a plot of the points. The image will slowly rotate. Successive mouse clicks alternate the axis of rotation from the X, to the Y, to the Z axis and back again.

Licensing: {#licensing align=”center”}

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

Languages: {#languages align=”center”}

XYZ_DISPLAY_OPENGL is available in a C++ version.

Related Data and Programs: {#related-data-and-programs align=”center”}

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

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.

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

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

XYZ_DISPLAY, a MATLAB program which reads XYZ information defining points in 3D, and displays an image in the MATLAB graphics window.

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

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

Reference: {#reference align=”center”}

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: {#source-code align=”center”}

• xyz_display_opengl.cpp, the source code.

Examples and Tests: {#examples-and-tests align=”center”}

• helix_201.xyz, 201 points that lie on a helix.
• helix_201.png, a PNG image of the screen generated by Open GL.

List of Routines: {#list-of-routines align=”center”}

• MAIN is the main program for XYZ_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.
• 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_R8 reads an R8 from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• SPIN_IMAGE adjusts the angle of rotation and redisplays the picture.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• TIMESTRING returns the current YMDHMS date as a string.
• 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.

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

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Last revised on 24 August 2010.