mirror of https://github.com/vitalif/openscad
Added stand-alone 2D tesselator
Marius Kintel
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3e2ff23c00
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3f6a590a2f
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This folder contains some CGAL test programs to easier develop and debug CGAL-based components.
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## polyhole-tessellator
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Tessellate an almost planar 3D polygon with holes into a vector of double precision 3D triangles.
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0,0,0
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2,0,0
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2,2,0
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0,2,0
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0.5,0.5,0
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1.5,0.5,0
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1.5,1.5,0
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0.5,1.5,0
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0,0,0
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2,0,0
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2,2,0
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#include <boost/foreach.hpp>
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#include <sstream>
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#include <iostream>
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#include <locale.h>
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#include "cgalutils.h"
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// Nef polyhedron are using CGAL_Kernel3 (Cartesian<Gmpq>)
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// Triangulation will use Epick
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static void export_stl(const Polygons &triangles, std::ostream &output)
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{
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setlocale(LC_NUMERIC, "C"); // Ensure radix is . (not ,) in output
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output << "solid OpenSCAD_Model\n";
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BOOST_FOREACH(const Polygon &p, triangles) {
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assert(p.size() == 3); // STL only allows triangles
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std::stringstream stream;
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stream << p[0][0] << " " << p[0][1] << " " << p[0][2];
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std::string vs1 = stream.str();
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stream.str("");
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stream << p[1][0] << " " << p[1][1] << " " << p[1][2];
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std::string vs2 = stream.str();
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stream.str("");
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stream << p[2][0] << " " << p[2][1] << " " << p[2][2];
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std::string vs3 = stream.str();
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if (vs1 != vs2 && vs1 != vs3 && vs2 != vs3) {
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// The above condition ensures that there are 3 distinct vertices, but
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// they may be collinear. If they are, the unit normal is meaningless
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// so the default value of "1 0 0" can be used. If the vertices are not
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// collinear then the unit normal must be calculated from the
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// components.
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Vector3d normal = (p[1] - p[0]).cross(p[2] - p[0]);
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normal.normalize();
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output << " facet normal " << normal[0] << " " << normal[1] << " " << normal[2] << "\n";
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output << " outer loop\n";
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BOOST_FOREACH(const Vector3d &v, p) {
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output << " vertex " << v[0] << " " << v[1] << " " << v[2] << "\n";
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}
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output << " endloop\n";
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output << " endfacet\n";
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}
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}
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output << "endsolid OpenSCAD_Model\n";
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setlocale(LC_NUMERIC, ""); // Set default locale
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}
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/*!
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file format:
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1. polygon coordinates (x,y,z) are comma separated (+/- spaces) and
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each coordinate is on a separate line
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2. each polygon is separated by one or more blank lines
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*/
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bool import_polygon(PolyholeK &polyhole, const std::string &filename)
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{
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std::ifstream ifs(filename.c_str());
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if (!ifs) return false;
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std::string line;
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PolygonK polygon;
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while (std::getline(ifs, line)) {
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std::stringstream ss(line);
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double X = 0.0, Y = 0.0, Z = 0.0;
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if (!(ss >> X)) {
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//ie blank lines => flag start of next polygon
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if (polygon.size() > 0) polyhole.push_back(polygon);
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polygon.clear();
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continue;
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}
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char c = ss.peek();
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while (c == ' ') {ss.read(&c, 1); c = ss.peek();} //gobble spaces before comma
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if (c == ',') {ss.read(&c, 1); c = ss.peek();} //gobble comma
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while (c == ' ') {ss.read(&c, 1); c = ss.peek();} //gobble spaces after comma
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if (!(ss >> Y)) {
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std::cerr << "Y error\n";
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return false;
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}
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c = ss.peek();
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while (c == ' ') {ss.read(&c, 1); c = ss.peek();} //gobble spaces before comma
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if (c == ',') {ss.read(&c, 1); c = ss.peek();} //gobble comma
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while (c == ' ') {ss.read(&c, 1); c = ss.peek();} //gobble spaces after comma
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if (!(ss >> Z)) {
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std::cerr << "Z error\n";
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return false;
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}
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polygon.push_back(Vertex3K(X, Y, Z));
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}
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if (polygon.size() > 0) polyhole.push_back(polygon);
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ifs.close();
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return true;
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}
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//------------------------------------------------------------------------------
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int main(int argc, char *argv[])
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{
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PolyholeK polyhole;
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if (argc == 2) {
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if (!import_polygon(polyhole, argv[1])) {
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std::cerr << "Error importing polygon" << std::endl;
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exit(1);
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}
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std::cerr << "Imported " << polyhole.size() << " polygons" << std::endl;
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}
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else {
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//construct two non-intersecting nested polygons
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PolygonK polygon1;
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polygon1.push_back(Vertex3K(0,0,0));
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polygon1.push_back(Vertex3K(2,0,0));
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polygon1.push_back(Vertex3K(2,2,0));
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polygon1.push_back(Vertex3K(0,2,0));
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PolygonK polygon2;
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polygon2.push_back(Vertex3K(0.5,0.5,0));
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polygon2.push_back(Vertex3K(1.5,0.5,0));
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polygon2.push_back(Vertex3K(1.5,1.5,0));
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polygon2.push_back(Vertex3K(0.5,1.5,0));
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polyhole.push_back(polygon1);
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polyhole.push_back(polygon2);
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}
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Polygons triangles;
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bool ok = CGALUtils::tessellatePolygonWithHoles(polyhole, triangles);
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std::cerr << "Tessellated into " << triangles.size() << " triangles" << std::endl;
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export_stl(triangles, std::cout);
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}
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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 = $$OPENSCAD_LIBDIR/lib
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}
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TARGET = polyhole-tessellator
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mac {
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CONFIG -= app_bundle
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}
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macx {
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# Mac needs special care to link against the correct C++ library
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# We attempt to auto-detect it by inspecting Boost
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dirs = $${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-format-security
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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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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/printutils.h
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SOURCES += polyhole-tessellator.cpp \
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../src/cgalutils-tess.cc \
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../src/printutils.cc
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