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ivread.html
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ivread.html
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<html>
<head>
<title>
IVREAD - 3D Graphics File Conversion
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
IVREAD <br> 3D Graphics File Conversion
</h1>
<hr>
<p>
<b>IVREAD</b>
is a FORTRAN90 program which
reads a 3D graphics file and converts the information
to another format.
</p>
<p>
<b>IVREAD</b> was originally written to read SGI Inventor 3D graphics
files and convert them to Digistar VLA format. Since then, the program
has evolved to allow the input and output of:
<ul>
<li>
ASE - <a href = "http://www.autodesk.com">AutoCAD</a>
ASCII export files;
</li>
<li>
BYU - <a href =
"../../data/byu/byu.html">
Movie.BYU surface geometry files</a>(output only);
</li>
<li>
DXF - <a href = "http://www.autodesk.com">AutoCAD</a> DXF files;
</li>
<li>
HRC - <a href = "http://www.softimage.com">SoftImage</a>
hierarchy files;
</li>
<li>
IV - <a href = "http://www.sgi.com">SGI Inventor</a> files;
</li>
<li>
OBJ - a file format from ALIAS (
<a href = "http://www.alias.com/eng/index.shtml">
http://www.alias.com/eng/index.shtml</a>)
</li>
<li>
OFF - Object file format for
<a href = "http://www.geomview.org/">GeomView</a>
</li>
<li>
OOGL - CMESH files from
<a href = "http://www.geomview.org/">GeomView</a>
(input only);
</li>
<li>
POV - <a href = "http://www.povray.org/">
Persistence of Vision</a> files (output only);
</li>
<li>
SMF - Michael Garland's format for
<a href =
"http://www.cs.cmu.edu/afs/cs/user/garland/www/quadrics/qslim.html">
QSLIM</a>;
</li>
<li>
STL -
<a href = "../../data/stla/stla.html">
ASCII Stereolithography files</a>;
</li>
<li>
TEC - <a href = "http://www.amtec.com/">
TECPLOT</a> files (output only);
</li>
<li>
TS - Mathematica <a href =
"http://documents.wolfram.com/v4/AddOns/Grph_ThreeScript-.html">
ThreeScript</a>;
</li>
<li>
TXT - text files (output only);
</li>
<li>
TRI/TRIA -
<a href = "../../data/tri/tri.html">
a simple ASCII triangle format</a>
requested by Greg Hood;
</li>
<li>
UCD - <a href = "http://www.avs.com">
Advanced Visual Systems (AVS)</a>
Unstructured Cell Data (output only);
</li>
<li>
VLA -
<a href = "../../data/vla/vla.html">
Digistar VLA files;</a>
</li>
<li>
WRL - VRML (Virtual Reality Modeling Language) files (output only).
</li>
<li>
XYZ -
<a href = "../../data/xyz/xyz.html">
XYZ files</a>
(inefficient but simple, point and line format);
</li>
</ul>
</p>
<p>
There is also a simple-minded facility to project any 3D image
onto a 2D plane, and make a
<a href = "../../data/ps/ps.html">PostScript image</a> of the result.
</p>
<p>
Graphics file formats are often poorly documented; hence this program
was written primarily by examining typical files and struggling
to interpret them. Particularly in the case of Inventor and DXF
files, the program is not able to handle all the subtleties of
the file format, and may mangle data, or even crash.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<dl>
<dt>
<b>ivread</b> <i>input.ext</i> <i>output.ext</i>
</dt>
<dd>
converts <i>input.ext</i> to <i>output.ext</i>, where
the input and output formats are determined by the
file name extensions.
</dd>
<dt>
<b>ivread</b>
</dt>
<dd>
if no files are specified, an interactive dialog
is set up, and the user can specify the files to
be converted.
</dd>
</dl>
</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">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/grf_io/grf_io.html">
GRF_IO</a>,
a FORTRAN90 library which
can read or write a GRF file.
</p>
<p>
<a href = "../../cpp_src/ivcon/ivcon.html">
IVCON</a>,
a C++ program which
reads 3D graphics file information in a variety of formats,
and can output the same information in a different format.
</p>
<p>
<a href = "../../f_src/obj_io/obj_io.html">
OBJ_IO</a>,
a FORTRAN90 library which
can read or write an OBJ file.
</p>
<p>
<a href = "../../f_src/pbma_io/pbma_io.html">
PBMA_IO</a>,
a FORTRAN90 library which
can read or write an ASCII Portable Bit Map (PBM) file.
</p>
<p>
<a href = "../../f_src/pgma_io/pgma_io.html">
PGMA_IO</a>,
a FORTRAN90 library which
can read or write an ASCII Portable Gray Map (PGM) file.
</p>
<p>
<a href = "../../f_src/plot3d_io/plot3d_io.html">
PLOT3D_IO</a>,
a FORTRAN90 library which
can read or write a PLOT3D file.
</p>
<p>
<a href = "../../f_src/ppma_io/ppma_io.html">
PPMA_IO</a>,
a FORTRAN90 library which
can read or write an ASCII Portable Pixel Map (PPM) file.
</p>
<p>
<a href = "../../f_src/stla_io/stla_io.html">
STLA_IO</a>,
a FORTRAN90 library which
can read or write an ASCII Stereolithography file.
</p>
<p>
<a href = "../../f_src/tec_to_fem/tec_to_fem.html">
TEC_TO_FEM</a>,
a FORTRAN90 program which
can read a TECPLOT file describing a
surface in 3D composed of triangles, and write
a set of FEM files.
</p>
<p>
<a href = "../../f_src/tec_to_obj/tec_to_obj.html">
TEC_TO_OBJ</a>,
a FORTRAN90 program which
can read a TECPLOT file describing a
surface in 3D composed of triangles or quadrilaterals, and write
an OBJ file.
</p>
<p>
<a href = "../../f_src/tec_write/tec_write.html">
TEC_WRITE</a>,
a FORTRAN90 library which
can write a TECPLOT file.
</p>
<p>
<a href = "../../f_src/xyz_io/xyz_io.html">
XYZ_IO</a>,
a FORTRAN90 library which
reads and writes XYZ files.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Adrian Bowyer, John Woodwark,<br>
A Programmer's Geometry,<br>
Butterworths, 1983.
</li>
<li>
James Foley, Andries van Dam, Steven Feiner, John Hughes,<br>
Computer Graphics, Principles and Practice,<br>
Addison Wesley, Second Edition, 1990.
</li>
<li>
Albert Nijenhuis, Herbert Wilf,<br>
Combinatorial Algorithms,<br>
Academic Press, 1978, second edition,<br>
ISBN 0-12-519260-6.
</li>
<li>
3D Systems, Inc,<br>
Stereolithography Interface Specification,<br>
October 1989.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "ivread.f90">ivread.f90</a>, the source code;
</li>
<li>
<a href = "ivread.sh">ivread.sh</a>,
commands to compile and load the source code;
</li>
</ul>
</p>
<h3 align = "center">
Tests and Examples:
</h3>
<p>
<ul>
<li>
<a href = "../../data/ase/cube.ase">cube.ase</a>;
</li>
<li>
<a href = "../../data/byu/cube.byu">cube.byu</a>;
</li>
<li>
<a href = "../../data/dxf/diamond.dxf">diamond.dxf</a>;
</li>
<li>
<a href = "../../data/hrc/cube.hrc">cube.hrc</a>;
</li>
<li>
<a href = "../../data/iv/materials.iv">materials.iv</a>;
</li>
<li>
<a href = "../../data/obj/cube.obj">cube.obj</a>;
</li>
<li>
<a href = "../../data/off/cube.off">cube.off</a>;
</li>
<li>
<a href = "../../data/oogl/surface.oogl">surface.oogl</a>;
</li>
<li>
<a href = "../../data/pov/cube.pov">cube.pov</a>;
</li>
<li>
<a href = "../../data/smf/cube_face.smf">cube_face.smf</a>;
</li>
<li>
<a href = "../../data/stl/magnolia.stl">magnolia.stl</a>;
</li>
<li>
<a href = "../../data/tec/cube.tec">cube.tec</a>;
</li>
<li>
<a href = "../../data/tri/cube.tria">cube.tria</a>;
</li>
<li>
<a href = "../../data/vla/diamond.vla">diamond.vla</a>;
</li>
<li>
<a href = "../../data/wrl/materials.wrl">materials.wrl</a>;
</li>
<li>
<a href = "../../data/xyz/spiralpoints.xyz">spiralpoints.xyz</a>;
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for IVREAD.
</li>
<li>
<b>ANGLE_RAD_3D</b> returns the angle in radians between two vectors in 3D.
</li>
<li>
<b>ASE_READ</b> reads graphics information from an ASE file.
</li>
<li>
<b>ASE_WRITE</b> writes graphics information to an ASE file.
</li>
<li>
<b>BYU_READ</b> reads graphics data from a Movie.BYU surface geometry file.
</li>
<li>
<b>BYU_WRITE</b> writes out the graphics data as a Movie.BYU surface geometry file.
</li>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is a case insensitive comparison of two characters for equality.
</li>
<li>
<b>CH_IS_CONTROL</b> reports whether a character is a control character or not.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>COMMAND_LINE</b> works with command line parameters.
</li>
<li>
<b>COR3_NORMAL_SET</b> recomputes zero node normal vectors.
</li>
<li>
<b>COR3_RANGE</b> computes and prints the coordinate minima and maxima.
</li>
<li>
<b>CROSS0_3D</b> computes the cross product of (P1-P0) and (P2-P0) in 3D.
</li>
<li>
<b>DATA_CHECK</b> checks the input data, and enforces limits.
</li>
<li>
<b>DATA_INIT</b> initializes internal graphics data.
</li>
<li>
<b>DATA_READ</b> reads a file into internal graphics data.
</li>
<li>
<b>DATA_REPORT</b> gives a summary of the contents of the data file.
</li>
<li>
<b>DATA_WRITE</b> writes the internal graphics data to a file.
</li>
<li>
<b>DEGREES_TO_RADIANS</b> converts an angle from degrees to radians.
</li>
<li>
<b>DIGIT_TO_CH</b> returns the character representation of a decimal digit.
</li>
<li>
<b>DOT0_3D</b> computes the dot product of (P1-P0) and (P2-P0) in 3D.
</li>
<li>
<b>DXF_READ</b> reads graphics information from an AutoCAD DXF file.
</li>
<li>
<b>DXF_WRITE</b> writes graphics data to an AutoCAD DXF file.
</li>
<li>
<b>EDGE_ADD_NODES</b> adds the edge defined by two nodes to the edge list.
</li>
<li>
<b>EDGE_BOUND</b> reports the edges which are part of the boundary.
</li>
<li>
<b>EDGE_COUNT</b> determines the number of edges in a graph.
</li>
<li>
<b>EDGE_MATCH_FACE</b> seeks an edge common to a face and the edge list.
</li>
<li>
<b>EDGE_MATCH_NODES</b> seeks an edge of the form (N1,N2) or (N2,N1) in EDGE.
</li>
<li>
<b>EDGE_NULL_DELETE</b> deletes face edges with zero length.
</li>
<li>
<b>ENORM_ND</b> computes the Euclidean norm of a vector in ND.
</li>
<li>
<b>ENORM0_3D</b> computes the Euclidean norm of (P1-P0) in 3D.
</li>
<li>
<b>FACE_AREA_SET</b> computes the area of the faces.
</li>
<li>
<b>FACE_CHECK</b> checks and analyzes a set of faces.
</li>
<li>
<b>FACE_FLIP</b> flips faces to achieve a consistent orientation.
</li>
<li>
<b>FACE_NORMAL_AVE</b> sets face normals as average of face vertex normals.
</li>
<li>
<b>FACE_NULL_DELETE</b> deletes faces of order less than 3.
</li>
<li>
<b>FACE_PRINT</b> prints out information about a face.
</li>
<li>
<b>FACE_REVERSE_ORDER</b> reverses the order of the nodes in each face.
</li>
<li>
<b>FACE_SORT</b> renumbers the faces in order of object and tier.
</li>
<li>
<b>FACE_SUBSET</b> selects a subset of the current faces as the new object.
</li>
<li>
<b>FACE_TO_EDGE</b> converts face data to edge data.
</li>
<li>
<b>FACE_TO_LINE</b> converts face information to line information.
</li>
<li>
<b>FACE_TOUCH</b> reports whether two polygonal faces touch.
</li>
<li>
<b>FILE_GET_NEXT_WORD</b> returns the next word and trailing context from a file.
</li>
<li>
<b>FILE_NAME_EXT_GET</b> determines the "extension" of a file name.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>HELLO</b> prints out a message about the program.
</li>
<li>
<b>HELP</b> prints out a help message about the interactive commands.
</li>
<li>
<b>HRC_READ</b> reads graphics information from a SoftImage HRC file.
</li>
<li>
<b>HRC_WRITE</b> writes graphics data to an HRC SoftImage file.
</li>
<li>
<b>I4_MODP</b> returns the nonnegative remainder of integer division.
</li>
<li>
<b>I4_SWAP</b> switches two integer values.
</li>
<li>
<b>I4_TO_S_ZERO</b> converts an integer to a string, with zero padding.
</li>
<li>
<b>I4_WRAP</b> forces an integer to lie between given limits by wrapping.
</li>
<li>
<b>INFILE</b> determines the input filename and type.
</li>
<li>
<b>INTERACT</b> interacts with the user to specify input and output files.
</li>
<li>
<b>INTNEX</b> "reads" integers from a string, one at a time.
</li>
<li>
<b>IV_POINT_WRITE</b> writes point and line data to an Inventor file.
</li>
<li>
<b>IV_READ</b> reads graphics information from an Inventor file.
</li>
<li>
<b>IV_WRITE</b> writes graphics data to an Inventor file.
</li>
<li>
<b>I4VEC_MAX</b> computes the maximum element of an integer array.
</li>
<li>
<b>I4VEC_REVERSE</b> reverses the elements of an I4VEC.
</li>
<li>
<b>I4VEC_ROTATE</b> rotates an object in place.
</li>
<li>
<b>LCON</b> reports whether a character is a control character or not.
</li>
<li>
<b>MESH_T3</b> produces a grid of pairs of 3 node triangles.
</li>
<li>
<b>NEWS</b> prints out news (old and new) about the program.
</li>
<li>
<b>NODE_RELAX</b> smooths a shape by an averaging operation on the node positions.
</li>
<li>
<b>NODE_TO_VERTEX_MATERIAL</b> extends node material definitions to vertices.
</li>
<li>
<b>OBJ_READ</b> reads graphics information from a Wavefront OBJ file.
</li>
<li>
<b>OBJ_WRITE</b> writes graphics information to a WaveFront OBJ file.
</li>
<li>
<b>OBJECT_BUILD</b> builds edge-connected "objects" out of polygonal faces.
</li>
<li>
<b>OBJECT_INVERT</b> makes an inverted duplicate of the object.
</li>
<li>
<b>OFF_READ</b> reads graphics information from a GEOMVIEW OFF file.
</li>
<li>
<b>OFF_WRITE</b> writes graphics information to a GEOMVIEW OFF file.
</li>
<li>
<b>OOGL_READ</b> reads graphics information from a OOGL file.
</li>
<li>
<b>OOGL_GRID</b> adds a grid to an OOGL data file.
</li>
<li>
<b>OUTFILE</b> determines the output filename and type.
</li>
<li>
<b>PI</b> returns the value of pi.
</li>
<li>
<b>PLANE_EXP2IMP_3D</b> converts an explicit plane to implicit form in 3D.
</li>
<li>
<b>PLANE_IMP_POINT_NEAREST_3D:</b> nearest point on a implicit plane to a point in 3D.
</li>
<li>
<b>POINTS_DISTANCE_3D</b> finds the distance between two points in 3D.
</li>
<li>
<b>POLY_2_TRI</b> converts a collection of polygons into a collection of triangles.
</li>
<li>
<b>POV_WRITE</b> writes graphics information to a POV file.
</li>
<li>
<b>PROJECT_2D</b> projects 3D data to 2D based on user choices.
</li>
<li>
<b>PROJECT_ANGLE</b> converts 3D data to 2D using a presentation angle.
</li>
<li>
<b>PROJECT_OPLANE</b> projects 3D points onto an orthographic plane.
</li>
<li>
<b>PROJECT_PPLANE</b> projects a point through a focus point onto a perspective plane.
</li>
<li>
<b>PS_WRITE</b> writes 2D face and line information to a PostScript file.
</li>
<li>
<b>R4_RANDOM</b> returns a random real in a given range.
</li>
<li>
<b>R4_SWAP</b> switches two R4's.
</li>
<li>
<b>R4COL_FIND</b> seeks a table column equal to a real vector.
</li>
<li>
<b>RGB_TO_HUE</b> converts (R,G,B) colors to a hue value between 0 and 1.
</li>
<li>
<b>RELNEX</b> "reads" real numbers from a string, one at a time.
</li>
<li>
<b>R4VEC_TO_S</b> "writes" an R4VEC into a string.
</li>
<li>
<b>S_BLANK_DELETE</b> removes blanks from a string, left justifying the remainder.
</li>
<li>
<b>S_BLANKS_DELETE</b> replaces consecutive blanks by one blank.
</li>
<li>
<b>S_CAP</b> replaces any lowercase letters by uppercase ones in a string.
</li>
<li>
<b>S_CAT</b> concatenates two strings to make a third string.
</li>
<li>
<b>S_CONTROL_BLANK</b> replaces control characters with blanks.
</li>
<li>
<b>S_EQI</b> is a case insensitive comparison of two strings for equality.
</li>
<li>
<b>S_INDEX_LAST</b> finds the LAST occurrence of a given substring.
</li>
<li>
<b>S_IS_I4</b> returns .TRUE. if STRING represents an integer.
</li>
<li>
<b>S_IS_R4</b> returns .TRUE. if STRING represents a real number.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_R4</b> reads an R4 from a string.
</li>
<li>
<b>S_TRIM_ZEROS</b> removes trailing zeros from a string.
</li>
<li>
<b>SMF_READ</b> reads graphics information from an SMF file.
</li>
<li>
<b>SMF_WRITE</b> writes graphics information to an SMF file.
</li>
<li>
<b>SORT_HEAP_EXTERNAL</b> externally sorts a list of items into linear order.
</li>
<li>
<b>STLA_READ</b> reads graphics information from an ASCII StereoLithography file.
</li>
<li>
<b>STLA_WRITE</b> writes graphics information to an ASCII StereoLithography file.
</li>
<li>
<b>TEC_WRITE</b> writes graphics information to a TECPLOT file.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>TMAT_INIT</b> initializes the geometric transformation matrix.
</li>
<li>
<b>TMAT_MXM</b> multiplies two geometric transformation matrices.
</li>
<li>
<b>TMAT_MXP</b> multiplies a geometric transformation matrix times a point.
</li>
<li>
<b>TMAT_MXP2</b> multiplies a geometric transformation matrix times N points.
</li>
<li>
<b>TMAT_MXV</b> multiplies a geometric transformation matrix times a vector.
</li>
<li>
<b>TMAT_ROT_AXIS</b> applies a coordinate axis rotation to the geometric transformation matrix.
</li>
<li>
<b>TMAT_ROT_VECTOR:</b> arbitrary axis rotation to geometric transformation matrix.
</li>
<li>
<b>TMAT_SCALE</b> applies a scaling to the geometric transformation matrix.
</li>
<li>
<b>TMAT_SHEAR</b> applies a shear to the geometric transformation matrix.
</li>
<li>
<b>TMAT_TRANS</b> applies a translation to the geometric transformation matrix.
</li>
<li>
<b>TRIA_READ</b> reads graphics information from an ASCII triangle file.
</li>
<li>
<b>TRIA_WRITE</b> writes the graphics data to an ASCII "triangle" file.
</li>
<li>
<b>TS_READ</b> reads graphics information from a Mathematica TS file.
</li>
<li>
<b>TS_WRITE</b> writes graphics information to a Mathematica TS file.
</li>
<li>
<b>TXT_WRITE</b> writes the graphics data to a text file.
</li>
<li>
<b>UCD_WRITE</b> writes graphics data to an AVS UCD file.
</li>
<li>
<b>VECTOR_UNIT_ND</b> normalizes a vector in ND.
</li>
<li>
<b>VERTEX_NORMAL_SET</b> recomputes the face vertex normal vectors.
</li>
<li>
<b>VERTEX_TO_NODE_MATERIAL</b> extends vertex material definitions to nodes.
</li>
<li>
<b>VLA_READ</b> reads graphics information from a VLA file.
</li>
<li>
<b>VLA_WRITE</b> writes graphics data to a VLA file.
</li>
<li>
<b>VRML_READ</b> reads graphics information from a VRML file.
</li>
<li>
<b>VRML_WRITE</b> writes graphics data to a VRML file.
</li>
<li>
<b>WORD_NEXT_READ</b> "reads" words from a string, one at a time.
</li>
<li>
<b>XGL_WRITE</b> writes graphics data to an XGL file.
</li>
<li>
<b>XYZ_READ</b> reads graphics information from an XYZ file.
</li>
<li>
<b>XYZ_WRITE</b> writes graphics data to an XYZ file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 15 November 2006.
</i>
<!-- John Burkardt -->
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