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// Converts Geometry Information in Inventor files (*.iv) into OFF format.
// The scanner triggers on Coordinate3, IndexedFaceSet, and IndexedLineSet
// keywords. It does not recognize transformations nor groups.
#include <CGAL/Simple_cartesian.h>
#include <CGAL/IO/Verbose_ostream.h>
#include <CGAL/IO/OFF.h>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <fstream>
#include <list>
using namespace std;
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point;
typedef list<Point> Point_list;
typedef list<std::size_t> Facet;
typedef list<Facet> Facet_list;
// Command line arguments
// ======================
bool verbose = false;
bool binary = false;
bool skel = false;
bool noc = false;
bool block = false;
int n_block = 0;
// Global data describing the object
// =================================
Point_list points;
Facet_list facets;
// iv File Scanner
// ===============
void iv_file_scanner( istream& in)
{
std::size_t offset = 0; // offset for the Index....Set
char c; // one read character (comment, vertex, or facet)
char str[2000]; // temporal storage for rest of identifier
int blocks = 0; // Number of blocks found.
CGAL::Verbose_ostream vout( verbose);
in >> str;
while( in) {
if ( strcmp( str, "label") == 0) {
in >> str;
vout << "Label " << str << " found." << endl;
in >> str;
}
if ( strcmp( str, "Coordinate3") == 0) {
in >> c;
if ( c == '{') {
in >> str;
if ( strcmp( str, "point") == 0) {
vout << "\"Coordinate3 { point\" block found." << endl;
blocks ++;
if ( ! block || n_block == blocks) {
if ( block)
vout << " this block is read." << endl;
// point coordinate list starts here
offset = points.size();
in >> c;
in >> c;
while ( in && ( c != ']')) {
in.putback( c);
Point p;
in >> p;
points.push_back( p);
in >> c; // comma or ']' or digit
if ( c == ',')
in >> c; // ignoring commas
}
vout << " " << points.size() - offset
<< " point coordinates read." << endl;
}
}
}
}
if ( block && n_block != blocks) {
in >> str;
continue;
}
if ( strcmp( str, "IndexedFaceSet") == 0) {
in >> c;
if ( c == '{') {
in >> str;
if ( strcmp( str, "coordIndex") == 0) {
vout << "\"IndexedFaceSet { coordIndex\" block found."
<< endl;
// indices start here
std::size_t face_offset = facets.size();
in >> c;
facets.push_back( Facet());
Facet* facet = &facets.back();
in >> c;
while ( in && ( c != ']')) {
in.putback( c);
int index;
in >> index;
if ( index >= 0) {
facet->push_back( index + offset);
} else {
facets.push_back( Facet());
facet = &facets.back();
}
in >> c; // comma or ']' or digit
if ( c == ',')
in >> c; // ignoring commas
}
facets.pop_back();
vout << " " << facets.size() - face_offset
<< " facets read." << endl;
}
}
}
if ( strcmp( str, "IndexedLineSet") == 0) {
in >> c;
if ( c == '{') {
in >> str;
if ( strcmp( str, "coordIndex") == 0) {
vout << "\"IndexedLineSet { coordIndex\" block found."
<< endl;
// indices start here
std::size_t face_offset = facets.size();
in >> c;
facets.push_back( Facet());
Facet* facet = &facets.back();
in >> c;
while ( in && ( c != ']')) {
in.putback( c);
int index;
in >> index;
if ( index >= 0) {
facet->push_back( index + offset);
} else {
facets.push_back( Facet());
facet = &facets.back();
}
in >> c; // comma or ']' or digit
if ( c == ',')
in >> c; // ignoring commas
}
facets.pop_back();
vout << " " << facets.size() - face_offset
<< " polylines read." << endl;
}
}
}
in >> str;
}
vout << endl;
vout << "Total number of vertices: " << points.size() << endl;
vout << "Total number of faces : " << facets.size() << endl;
vout << "Total number of blocks : " << blocks << endl << endl;
}
// OFF File Writer
// ===============
void print_OFF( ostream& out) {
CGAL::File_header_OFF header( binary, noc, skel, verbose);
CGAL::File_writer_OFF writer( header);
writer.write_header( out, points.size(), 0, facets.size());
while( ! points.empty()) {
writer.write_vertex( points.front().x(),
points.front().y(),
points.front().z());
points.pop_front();
}
writer.write_facet_header();
while( ! facets.empty()) {
Facet& facet = facets.front();
writer.write_facet_begin( facet.size());
while( ! facet.empty()) {
writer.write_facet_vertex_index( facet.front());
facet.pop_front();
}
writer.write_facet_end();
facets.pop_front();
}
writer.write_footer();
}
// main function with standard unix commandline arguments
// ------------------------------------------------------
int main( int argc, char **argv) {
int n = 0; // number of filenames
char *filename[2];
bool help = false;
for (int i = 1; i < argc; i++) { // check commandline options
if ( strcmp( "-v", argv[i]) == 0)
verbose = true;
else if ( strcmp( "-b", argv[i]) == 0)
binary = true;
else if ( strcmp( "-skel", argv[i]) == 0)
skel = true;
else if ( strcmp( "-noc", argv[i]) == 0)
noc = true;
else if ( strcmp( "-#", argv[i]) == 0) {
block = true;
i++;
if ( i < argc) {
n_block = atoi( argv[i]);
if ( n_block < 0) {
cerr << argv[0] << ": error: <i> must be greater than "
" zero." << endl;
help = true;
}
} else {
cerr << argv[0] << ": error: -# needs an integer parameter."
<< endl;
help = true;
}
} else if ( (strcmp( "-h", argv[i]) == 0) ||
(strcmp( "-help", argv[i]) == 0))
help = true;
else if ( n < 2 ) {
filename[ n++] = argv[i];
} else {
++n;
break;
}
}
if ((n > 2) || help) {
if ( ! help)
cerr << "Error: in parameter list" << endl;
cerr << "Usage: " << argv[0] << " [<options>] [<infile> [<outfile>]]"
<< endl;
cerr << " converts an Inventor file to OFF." << endl;
cerr << " -# <i> convert only i-th block (i in 1..n)." << endl;
cerr << " -b binary (default is ASCII)." << endl;
cerr << " -skel Geomview SKEL format." << endl;
cerr << " -noc no comments in file." << endl;
cerr << " -v verbose." << endl;
exit( ! help);
}
CGAL::Verbose_ostream vout( verbose);
vout << argv[0] << ": verbosity on." << endl;
const char* iname = "cin";
istream* p_in = &cin;
ifstream in;
if ( n > 0) {
in.open( filename[0]);
p_in = ∈
iname = filename[0];
}
if ( !*p_in) {
cerr << argv[0] << ": error: cannot open file '"<< iname
<< "' for reading." <<endl;
exit( 1);
}
const char* oname = "cout";
ostream* p_out = &cout;
ofstream out;
if ( n > 1) {
out.open( filename[1]);
p_out = &out;
oname = filename[1];
}
if ( !*p_out) {
cerr << argv[0] << ": error: cannot open file '"<< oname
<< "' for writing." <<endl;
exit( 1);
}
CGAL::IO::set_ascii_mode(* p_in);
CGAL::IO::set_ascii_mode(* p_out);
vout << "Scanning Inventor file `" << iname << "' ....\n--------" << endl;
iv_file_scanner( *p_in);
vout << "--------\n .... done." << endl;
if ( !*p_in && !p_in->eof()) {
cerr << argv[0] << " read error: while reading file '"<< iname << "'."
<< endl;
exit( 1);
}
vout << "print_OFF: `" << iname << "' ...." << endl;
print_OFF( *p_out);
vout << " .... done." << endl;
if ( !*p_out) {
cerr << argv[0] << " write error: while writing file '"<< oname
<< "'." << endl;
exit( 1);
}
return 0;
}
// EOF //
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