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<html>
<head>
<title>
OBJ_IO - Read and Write Routines for Alias OBJ 3D Graphics Files
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
OBJ_IO <br> Read and Write Routines <br> Alias OBJ 3D Graphics Files
</h1>
<hr>
<p>
<b>OBJ_IO</b>
is a C++ library which
reads or writes some of the 3D graphics
information stored in an Alias OBJ file.
</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>OBJ_IO</b> is available in
<a href = "../../cpp_src/obj_io/obj_io.html">a C++ version</a> and
<a href = "../../f_src/obj_io/obj_io.html">a FORTRAN90 version</a> and
<a href = "../../m_src/obj_io/obj_io.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/ivcon/ivcon.html">
IVCON</a>,
a C++ program which
can convert graphics information between STLA and other formats.
</p>
<p>
<a href = "../../f_src/ivread/ivread.html">
IVREAD</a>,
a FORTRAN90 program which
can convert graphics information between STLA and other formats.
</p>
<p>
<a href = "../../data/obj/obj.html">
OBJ</a>,
a data directory which
has some examples of OBJ files.
</p>
<p>
<a href = "../../c_src/obj_to_ply/obj_to_ply.html">
OBJ_TO_PLY</a>,
a C program which
reads an OBJ file and writes similar information to a
<a href = "../../data/ply/ply.html">PLY</a> file.
</p>
<p>
<a href = "../../m_src/obj_to_tri_mesh/obj_to_tri_mesh.html">
OBJ_TO_TRI_MESH</a>,
a MATLAB program which
reads an OBJ file and extracts
the surface mesh data as a
<a href = "../../data/tri_mesh/tri_mesh.html">TRI_MESH</a> dataset.
</p>
<p>
<a href = "../../pl_src/obj2opengl/obj2opengl.html">
OBJ2OPENGL</a>,
a PERL script which
converts an OBJ file to a C/C++ include file appropriate for use with
<a href = "../../cpp_src/open_gl/open_gl.html">OPEN_GL</a>.
</p>
<p>
<a href = "../../c_src/ply_to_obj/ply_to_obj.html">
PLY_TO_OBJ</a>,
a C program which
reads a PLY 3D graphics file and writes an equivalent OBJ graphics file.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
<a href = "http://www.alias.com/eng/index.shtml">
http://www.alias.com/eng/index.shtml</a>,
The Alias web site.
</li>
<li>
<a href = "../../txt/obj_format.txt">obj_format.txt</a>,
some information about the OBJ format.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "obj_io.cpp">obj_io.cpp</a>, the source code.
</li>
<li>
<a href = "obj_io.hpp">obj_io.hpp</a>, the include file.
</li>
<li>
<a href = "obj_io.sh">obj_io.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "obj_io_prb.cpp">obj_io_prb.cpp</a>,
a sample calling program.
</li>
<li>
<a href = "obj_io_prb.sh">obj_io_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "../../data/obj/cube.obj">cube.obj</a>,
a simple OBJ file that describes a cube.
</li>
<li>
<a href = "cube_no_normals.obj">cube_no_normals.obj</a>,
an OBJ file describing a cube, without normal vectors,
written by OBJ_WRITE.
</li>
<li>
<a href = "cube_normals.obj">cube_normals.obj</a>,
an OBJ file describing a cube, including normal vectors,
written by OBJ_WRITE.
</li>
<li>
<a href = "obj_io_prb_output.txt">obj_io_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>I4_MAX</b> returns the maximum of two I4's.
</li>
<li>
<b>OBJ_FACE_NODE_PRINT</b> prints the node indices for each face.
</li>
<li>
<b>OBJ_NORMAL_VECTOR_PRINT</b> prints the normal vectors.
</li>
<li>
<b>OBJ_NODE_XYZ_PRINT</b> prints the node coordinates.
</li>
<li>
<b>OBJ_SIZE</b> determines sizes of graphics objects in an Alias OBJ file.
</li>
<li>
<b>OBJ_SIZE_PRINT</b> prints sizes associated with an OBJ file.
</li>
<li>
<b>OBJ_VERTEX_NORMAL_PRINT</b> prints the normal vectors indices per vertex.
</li>
<li>
<b>OBJ_WRITE</b> writes graphics information to an Alias OBJ file.
</li>
<li>
<b>R8VEC_CROSS_PRODUCT_3D</b> computes the cross product of two R8VEC's in 3D.
</li>
<li>
<b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</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 01 April 2011.
</i>
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