mirror of https://github.com/vitalif/openscad
Stand-alone program for exporting a Nef polyhedron to STL
Marius Kintel
parent
b519718b64
commit
6a39812160
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#include <boost/foreach.hpp>
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#include <boost/regex.hpp>
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#include <sstream>
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#include <iostream>
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#include <fstream>
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#include <locale.h>
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#include "cgalutils.h"
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#include "export.h"
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#include "polyset.h"
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#include "CGAL_Nef_polyhedron.h"
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#include "boosty.h"
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#include <CGAL/IO/Nef_polyhedron_iostream_3.h>
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using namespace CGALUtils;
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#define STL_FACET_NUMBYTES 4*3*4+2
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// as there is no 'float32_t' standard, we assume the systems 'float'
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// is a 'binary32' aka 'single' standard IEEE 32-bit floating point type
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union stl_facet {
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uint8_t data8[ STL_FACET_NUMBYTES ];
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uint32_t data32[4*3];
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struct facet_data {
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float i, j, k;
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float x1, y1, z1;
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float x2, y2, z2;
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float x3, y3, z3;
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uint16_t attribute_byte_count;
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} data;
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};
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void uint32_byte_swap( uint32_t &x )
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{
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#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3
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x = __builtin_bswap32( x );
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#elif defined(__clang__)
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x = __builtin_bswap32( x );
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#elif defined(_MSC_VER)
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x = _byteswap_ulong( x );
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#else
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uint32_t b1 = ( 0x000000FF & x ) << 24;
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uint32_t b2 = ( 0x0000FF00 & x ) << 8;
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uint32_t b3 = ( 0x00FF0000 & x ) >> 8;
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uint32_t b4 = ( 0xFF000000 & x ) >> 24;
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x = b1 | b2 | b3 | b4;
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#endif
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}
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void read_stl_facet( std::ifstream &f, stl_facet &facet )
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{
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f.read( (char*)facet.data8, STL_FACET_NUMBYTES );
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#ifdef BOOST_BIG_ENDIAN
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for ( int i = 0; i < 12; i++ ) {
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uint32_byte_swap( facet.data32[ i ] );
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}
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// we ignore attribute byte count
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#endif
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}
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PolySet *import_stl(const std::string &filename)
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{
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PolySet *p = new PolySet(3);
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// Open file and position at the end
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std::ifstream f(filename.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
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if (!f.good()) {
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PRINTB("WARNING: Can't open import file '%s'.", filename);
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return NULL;
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}
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boost::regex ex_sfe("solid|facet|endloop");
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boost::regex ex_outer("outer loop");
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boost::regex ex_vertex("vertex");
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boost::regex ex_vertices("\\s*vertex\\s+([^\\s]+)\\s+([^\\s]+)\\s+([^\\s]+)");
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bool binary = false;
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std::streampos file_size = f.tellg();
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f.seekg(80);
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if (f.good() && !f.eof()) {
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uint32_t facenum = 0;
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f.read((char *)&facenum, sizeof(uint32_t));
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#ifdef BOOST_BIG_ENDIAN
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uint32_byte_swap( facenum );
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#endif
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if (file_size == static_cast<std::streamoff>(80 + 4 + 50*facenum)) {
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binary = true;
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}
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}
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f.seekg(0);
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char data[5];
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f.read(data, 5);
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if (!binary && !f.eof() && f.good() && !memcmp(data, "solid", 5)) {
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int i = 0;
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double vdata[3][3];
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std::string line;
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std::getline(f, line);
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while (!f.eof()) {
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std::getline(f, line);
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boost::trim(line);
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if (boost::regex_search(line, ex_sfe)) {
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continue;
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}
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if (boost::regex_search(line, ex_outer)) {
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i = 0;
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continue;
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}
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boost::smatch results;
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if (boost::regex_search(line, results, ex_vertices)) {
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try {
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for (int v=0;v<3;v++) {
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vdata[i][v] = boost::lexical_cast<double>(results[v+1]);
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}
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}
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catch (const boost::bad_lexical_cast &blc) {
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PRINTB("WARNING: Can't parse vertex line '%s'.", line);
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i = 10;
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continue;
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}
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if (++i == 3) {
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p->append_poly();
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p->append_vertex(vdata[0][0], vdata[0][1], vdata[0][2]);
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p->append_vertex(vdata[1][0], vdata[1][1], vdata[1][2]);
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p->append_vertex(vdata[2][0], vdata[2][1], vdata[2][2]);
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}
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}
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}
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}
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else if (binary && !f.eof() && f.good())
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{
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f.ignore(80-5+4);
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while (1) {
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stl_facet facet;
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read_stl_facet( f, facet );
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if (f.eof()) break;
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p->append_poly();
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p->append_vertex(facet.data.x1, facet.data.y1, facet.data.z1);
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p->append_vertex(facet.data.x2, facet.data.y2, facet.data.z2);
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p->append_vertex(facet.data.x3, facet.data.y3, facet.data.z3);
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}
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}
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return p;
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}
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int main(int argc, char *argv[])
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{
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OpenSCAD::debug = "export_nef";
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CGAL_Nef_polyhedron *N = NULL;
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PolySet *ps = NULL;
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if (argc == 2) {
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std::string filename(argv[1]);
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std::string suffix = boosty::extension_str(filename);
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boost::algorithm::to_lower(suffix);
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if (suffix == ".stl") {
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if (!(ps = import_stl(filename))) {
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std::cerr << "Error importing STL " << argv[1] << std::endl;
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exit(1);
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}
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std::cerr << "Imported " << ps->numPolygons() << " polygons" << std::endl;
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}
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else if (suffix == ".nef3") {
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N = new CGAL_Nef_polyhedron(new CGAL_Nef_polyhedron3);
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std::ifstream stream(filename.c_str());
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stream >> *N->p3;
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}
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}
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else {
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std::cerr << "Usage: " << argv[0] << " <file.stl>" << std::endl;
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exit(1);
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}
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if (ps && !N) N = createNefPolyhedronFromGeometry(*ps);
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export_stl(N, std::cout);
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std::cerr << "Done." << std::endl;
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}
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CONFIG += debug
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CONFIG -= qt
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debug: DEFINES += DEBUG
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TEMPLATE = app
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INCLUDEPATH += ../src
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DEPENDPATH += ../src
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# Handle custom library location.
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# Used when manually installing 3rd party libraries
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isEmpty(OPENSCAD_LIBDIR) OPENSCAD_LIBDIR = $$(OPENSCAD_LIBRARIES)
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macx:isEmpty(OPENSCAD_LIBDIR) {
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exists(/opt/local):exists(/usr/local/Cellar) {
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error("It seems you might have libraries in both /opt/local and /usr/local. Please specify which one to use with qmake OPENSCAD_LIBDIR=<prefix>")
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} else {
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exists(/opt/local) {
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#Default to MacPorts on Mac OS X
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message("Automatically searching for libraries in /opt/local. To override, use qmake OPENSCAD_LIBDIR=<prefix>")
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OPENSCAD_LIBDIR = /opt/local
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} else:exists(/usr/local/Cellar) {
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message("Automatically searching for libraries in /usr/local. To override, use qmake OPENSCAD_LIBDIR=<prefix>")
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OPENSCAD_LIBDIR = /usr/local
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}
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}
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}
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!isEmpty(OPENSCAD_LIBDIR) {
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QMAKE_INCDIR = $$OPENSCAD_LIBDIR/include
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QMAKE_LIBDIR = $$OPENSCAD_LIBDIR/lib
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}
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TARGET = export_nef
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mac {
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CONFIG -= app_bundle
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}
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macx {
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# Mac needs special care to link against the correct C++ library
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# We attempt to auto-detect it by inspecting Boost
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dirs = $${BOOSTDIR} $${QMAKE_LIBDIR}
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for(dir, dirs) {
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system(grep -q __112basic_string $${dir}/libboost_thread* >& /dev/null) {
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message("Detected libc++-linked boost in $${dir}")
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CONFIG += libc++
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}
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}
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libc++ {
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QMAKE_CXXFLAGS += -stdlib=libc++
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QMAKE_LFLAGS += -stdlib=libc++
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QMAKE_OBJECTIVE_CFLAGS += -stdlib=libc++
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# libc++ on requires Mac OS X 10.7+
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QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
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}
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}
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# See Dec 2011 OpenSCAD mailing list, re: CGAL/GCC bugs.
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*g++* {
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QMAKE_CXXFLAGS *= -fno-strict-aliasing
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QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-local-typedefs # ignored before 4.8
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}
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*clang* {
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# http://llvm.org/bugs/show_bug.cgi?id=9182
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QMAKE_CXXFLAGS_WARN_ON += -Wno-overloaded-virtual
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# disable enormous amount of warnings about CGAL / boost / etc
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QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-parameter
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QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-variable
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QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-function
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QMAKE_CXXFLAGS_WARN_ON += -Wno-c++11-extensions
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# might want to actually turn this on once in a while
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QMAKE_CXXFLAGS_WARN_ON += -Wno-sign-compare
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}
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# Application configuration
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CONFIG += cgal
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CONFIG += boost
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CONFIG += eigen
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CONFIG += gettext
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mac: {
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LIBS += -framework OpenGL
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}
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include(../common.pri)
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HEADERS += ../src/cgal.h \
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../src/cgalutils.h \
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../src/linalg.h \
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../src/polyset.h \
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../src/polyset-utils.h \
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../src/printutils.h
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SOURCES += export_nef.cpp \
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../src/polygon2d.cc \
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../src/polygon2d-CGAL.cc \
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../src/CGAL_Nef_polyhedron.cc \
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../src/CGAL_Nef_polyhedron_DxfData.cc \
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../src/cgalutils.cc \
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../src/cgalutils-tess.cc \
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../src/cgalutils-polyhedron.cc \
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../src/polyset.cc \
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../src/svg.cc \
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../src/node.cc \
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../src/export.cc \
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../src/polyset-utils.cc \
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../src/progress.cc \
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../src/printutils.cc \
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../src/grid.cc
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