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<html>
<head>
<title>
POLYGONAL_SURFACE_DISPLAY_OPENGL - Display a Polygonal Surface using OpenGL
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
POLYGONAL_SURFACE_DISPLAY_OPENGL <br> Display a Polygonal Surface using OpenGL
</h1>
<hr>
<p>
<b>POLYGONAL_SURFACE_DISPLAY_OPENGL</b>
is a C++ program which
gets the names of the node and
element files defining a polygonal surface, reads the information
from the files, and displays the surface on the screen using OpenGL.
</p>
<p>
The surface is presented in rotation about the X axis. By clicking
the mouse button, the axis of rotation will be advanced from X to Y
to Z and back to X.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>polygonal_surface_display</b> <i>prefix</i>
</blockquote>
where <i>prefix</i> is the common filename prefix, so that:
<ul>
<li>
<i>prefix</i><b>_nodes.txt</b> contains the node coordinates;
</li>
<li>
<i>prefix</i><b>_elements.txt</b> contains indices of nodes that form the elements;
</li>
</ul>
reads the information
and displays an image of the polygonal surface on the screen.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>POLYGONAL_SURFACE_DISPLAY_OPENGL</b> is available in
<a href = "../../cpp_src/polygonal_surface_display_opengl/polygonal_surface_display_opengl.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/bezier_surface_display/bezier_surface_display.html">
BEZIER_SURFACE_DISPLAY</a>,
a MATLAB program which
reads two files defining a Bezier surface and displays it.
</p>
<p>
<a href = "../../cpp_src/caustic_opengl/caustic_opengl.html">
CAUSTIC_OPENGL</a>,
a C++ program which
computes a caustic curve and displays it using OpenGL.
</p>
<p>
<a href = "../../cpp_src/fern_opengl/fern_opengl.html">
FERN_OPENGL</a>,
a C++ program which
uses OpenGL to display the Barnsley fractal fern.
</p>
<p>
<a href = "../../c_src/flood_opengl/flood_opengl.html">
FLOOD_OPENGL</a>,
a C program which
allows a user to select a region and flood it with color,
using OpenGL, by Art Wetzel.
</p>
<p>
<a href = "../../c_src/life_opengl/life_opengl.html">
LIFE_OPENGL</a>,
a C program which
simulates a version of John Conway's "Game of Life", displaying the
results using OpenGL.
</p>
<p>
<a href = "../../cpp_src/lights_out_opengl/lights_out_opengl.html">
LIGHTS_OUT_OPENGL</a>,
a C++ program which
sets up a "Lights Out" game and allows the user to solve it,
using the OpenGL graphics window.
</p>
<p>
<a href = "../../cpp_src/lissajous_opengl/lissajous_opengl.html">
LISSAJOUS_OPENGL</a>,
a C++ program which
computes a Lissajous figure and displays it using OpenGL.
</p>
<p>
<a href = "../../cpp_src/opengl/opengl.html">
OPENGL</a>,
C++ programs which
illustrate the use of the OpenGL graphics library;
</p>
<p>
<a href = "../../m_src/obj_display/obj_display.html">
OBJ_DISPLAY</a>,
a MATLAB program which
reads an OBJ file defining a 3D object and displays it within MATLAB.
</p>
<p>
<a href = "../../data/polygonal_surface/polygonal_surface.html">
POLYGONAL_SURFACE</a>,
a data directory which
contains examples of polygonal surface files.
</p>
<p>
<a href = "../../m_src/polygonal_surface_display/polygonal_surface_display.html">
POLYGONAL_SURFACE_DISPLAY</a>,
a MATLAB program which
displays a surface in 3D described as a set of polygons.
</p>
<p>
<a href = "../../cpp_src/rotating_cube_display_opengl/rotating_cube_display_opengl.html">
ROTATING_CUBE_DISPLAY_OPENGL</a>,
a C++ program which
displays a rotating color cube in 3D, using OpenGL;
</p>
<p>
<a href = "../../cpp_src/sphere_xyz_display_opengl/sphere_xyz_display_opengl.html">
SPHERE_XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZ information defining points in 3D,
and displays a unit sphere and the points, using OpenGL.
</p>
<p>
<a href = "../../m_src/stla_display/stla_display.html">
STLA_DISPLAY</a>,
a MATLAB program which
reads an ASCII STL file and displays it.
</p>
<p>
<a href = "../../m_src/tet_mesh_display/tet_mesh_display.html">
TET_MESH_DISPLAY</a>,
a MATLAB program which
reads files defining a tet mesh and displays an image
within MATLAB.
</p>
<p>
<a href = "../../cpp_src/tet_mesh_display_opengl/tet_mesh_display_opengl.html">
TET_MESH_DISPLAY_OPENGL</a>,
a C++ program which
reads files defining a tet mesh and displays an image
using Open GL.
</p>
<p>
<a href = "../../cpp_src/tri_surface_display_opengl/tri_surface_display_opengl.html">
TRI_SURFACE_DISPLAY_OPENGL</a>,
a C++ program which
displays the 3D graphics information
in a TRI_SURFACE file
using OpenGL.
</p>
<p>
<a href = "../../cpp_src/triangulation_display_opengl/triangulation_display_opengl.html">
TRIANGULATION_DISPLAY_OPENGL</a>,
a C++ program which
reads files defining a triangulation and displays an image
using Open GL.
</p>
<p>
<a href = "../../m_src/triangulation_order1_display/triangulation_order1_display.html">
TRIANGULATION_ORDER1_DISPLAY</a>,
a MATLAB program which
reads files defining a piecewise constant triangulation of data, and displays
a corresponding 3D surface.
</p>
<p>
<a href = "../../cpp_src/xy_display_opengl/xy_display_opengl.html">
XY_DISPLAY_OPENGL</a>,
a C++ program which
reads an XY file of 2D point coordinates, and displays
an image of those points using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyl_display_opengl/xyl_display_opengl.html">
XYL_DISPLAY_OPENGL</a>,
a C++ program which
reads XYL information defining points and lines in 2D, and displays
an image using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyz_display_opengl/xyz_display_opengl.html">
XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads an XYZ file of 3D point coordinates, and displays
an image of those points using OpenGL.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Edward Angel,<br>
Interactive Computer Graphics,
a Top-Down Approach with OpenGL,<br>
Addison-Wesley, 2000,<br>
ISBN: 0-201-38597-X,<br>
LC: T385.A514.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "polygonal_surface_display_opengl.cpp">polygonal_surface_display_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "polygonal_surface_display_opengl.sh">polygonal_surface_display_opengl.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>SPHERE_T3</b> is a sphere, tiled with an 8 by 8 array of
logically triangular patches.
<ul>
<li>
<a href = "sphere_t3_nodes.txt">
sphere_t3_nodes.txt</a>, the node file;
</li>
<li>
<a href = "sphere_t3_elements.txt">
sphere_t3_elements.txt</a>, the face file;
</li>
<li>
<a href = "sphere_t3.png">
sphere_t3.png</a>,
a PNG image of
the shape as displayed by <b>POLYGONAL_SURFACE_DISPLAY</b>.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for POLYGONAL_SURFACE_DISPLAY_OPENGL.
</li>
<li>
<b>CH_EQI</b> is true if two characters are equal, disregarding case.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>DISPLAY</b> generates the graphics output.
</li>
<li>
<b>FILE_COLUMN_COUNT</b> counts the columns in the first line of a file.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of row records in a file.
</li>
<li>
<b>I4_MAX</b> returns the maximum of two I4's.
</li>
<li>
<b>I4_MIN</b> returns the smaller of two I4's.
</li>
<li>
<b>I4MAT_DATA_READ</b> reads data from an I4MAT file.
</li>
<li>
<b>I4MAT_HEADER_READ</b> reads the header from an I4MAT file.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT_SOME</b> prints some of an I4MAT, transposed.
</li>
<li>
<b>MESH_BASE_ZERO</b> ensures that the element definition is zero-based.
</li>
<li>
<b>MOUSE</b> determines the response to mouse input.
</li>
<li>
<b>MYINIT</b> initializes OpenGL state variables.
</li>
<li>
<b>MYRESHAPE</b> determines the window mapping.
</li>
<li>
<b>NODE_NORMAL_SET</b> computes node normal vectors.
</li>
<li>
<b>R8_MAX</b> returns the maximum of two R8's.
</li>
<li>
<b>R83VEC_MAX</b> returns the maximum value in an R83VEC.
</li>
<li>
<b>R83VEC_MIN</b> returns the minimum value in an R83VEC.
</li>
<li>
<b>R8MAT_DATA_READ</b> reads the data from an R8MAT file.
</li>
<li>
<b>R8MAT_HEADER_READ</b> reads the header from an R8MAT file.
</li>
<li>
<b>R8MAT_TRANSPOSE_PRINT_SOME</b> prints some of an R8MAT, transposed.
</li>
<li>
<b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an I4VEC from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from a string.
</li>
<li>
<b>S_TO_R8VEC</b> reads an R8VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>SPINSURFACE</b> adjusts the angle of rotation and redisplays the picture.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 05 December 2010.
</i>
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