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obj_io.html
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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 MATLAB 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 PLY file.
</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 OpenGL.
</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>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "ch_cap.m">ch_cap.m</a>
capitalizes a character.
</li>
<li>
<a href = "ch_eqi.m">ch_eqi.m</a>
case-insensitive comparison of two characters.
</li>
<li>
<a href = "ch_index.m">ch_index.m</a>
seeks the first occurrence of a character in a string.
</li>
<li>
<a href = "ch_is_control.m">ch_is_control.m</a>
is TRUE if C is a control character.
</li>
<li>
<a href = "ch_is_digit.m">ch_is_digit.m</a>
is TRUE if C is a digit.
</li>
<li>
<a href = "ch_to_digit.m">ch_to_digit.m</a>
converts a character to the digit it represents.
</li>
<li>
<a href = "obj_face_node_print.m">obj_face_node_print.m</a>
prints the node indices for each face.
</li>
<li>
<a href = "obj_node_xyz_print.m">obj_node_xyz_print.m</a>
prints the node coordinates.
</li>
<li>
<a href = "obj_normal_vector_print.m">obj_normal_vector_print.m</a>
prints the normal vectors.
</li>
<li>
<a href = "obj_read.m">obj_read.m</a>
reads graphics information from a Wavefront OBJ file.
</li>
<li>
<a href = "obj_size.m">obj_size.m</a>
determines sizes of graphics objects in an Alias OBJ file.
</li>
<li>
<a href = "obj_size_print.m">obj_size_print.m</a>
prints sizes associated with an OBJ file.
</li>
<li>
<a href = "obj_vertex_normal_print.m">obj_vertex_normal_print.m</a>
prints the normal vectors indices per vertex.
</li>
<li>
<a href = "obj_write.m">obj_write.m</a>
writes graphics information to an Alias OBJ file.
</li>
<li>
<a href = "r8vec_cross_product_3d.m">r8vec_cross_product_3d.m</a>
computes the cross product of two vectors in 3D.
</li>
<li>
<a href = "s_cat.m">s_cat.m</a>
concatenates two strings to make a third string.
</li>
<li>
<a href = "s_control_blank.m">s_control_blank.m</a>
replaces control characters with blanks.
</li>
<li>
<a href = "s_eqi.m">s_eqi.m</a>
is a case insensitive comparison of two strings for equality.
</li>
<li>
<a href = "s_len_trim.m">s_len_trim.m</a>
returns the length of a string to the last nonblank.
</li>
<li>
<a href = "s_to_i4.m">s_to_i4.m</a>
reads an integer value from a string.
</li>
<li>
<a href = "s_to_r8.m">s_to_r8.m</a>
reads an R8 from a string.
</li>
<li>
<a href = "timestamp.m">timestamp.m</a>
prints the current YMDHMS date as a time stamp.
</li>
<li>
<a href = "word_next_read.m">word_next_read.m</a>
"reads" words from a string, one at a time.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "obj_io_test.m">obj_io_test.m</a>,
commands to run all the tests.
</li>
<li>
<a href = "obj_io_test01.m">obj_io_test01.m</a>,
tests OBJ_SIZE.
</li>
<li>
<a href = "obj_io_test02.m">obj_io_test02.m</a>,
tests OBJ_READ.
</li>
<li>
<a href = "obj_io_test03.m">obj_io_test03.m</a>,
tests OBJ_WRITE.
</li>
<li>
<a href = "obj_io_test04.m">obj_io_test04.m</a>,
tests OBJ_WRITE.
</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>
<p>
You can go up one level to <a href = "../m_src.html">
the MATLAB source codes</a>.
</p>
<hr>
<i>
Last revised on 26 January 2011.
</i>
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