trimesh_intersection.cpp

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#include <vector>

using namespace std;

// VCG headers for triangular mesh processing
#include<vcg/simplex/edge/base.h>
#include<vcg/simplex/edge/component.h>
#include<vcg/simplex/vertex/base.h>
#include<vcg/simplex/face/base.h>
#include <vcg/complex/trimesh/base.h>
#include <vcg/complex/trimesh/update/topology.h>
#include <vcg/complex/trimesh/update/edges.h>
#include <vcg/complex/trimesh/update/bounding.h>
#include <vcg/complex/trimesh/update/flag.h>
#include <vcg/complex/trimesh/clean.h>
#include <vcg/complex/intersection.h>
#include <vcg/space/index/grid_static_ptr.h>
//#include <vcg/simplex/edge/with/ae.h>
#include <vcg/complex/edgemesh/base.h>
#include <vcg/complex/edgemesh/allocate.h>
#include <vcg/complex/edgemesh/update/bounding.h>

// VCG File Format Importer/Exporter
#include <wrap/io_trimesh/import.h>
#include <wrap/io_edgemesh/export_svg.h>
#include <wrap/io_edgemesh/export_dxf.h>

// VCG Vertex

// VCG Faces

using namespace vcg;

class MyFace;
class MyEdge;
class MyVertex;

struct MyUsedTypes : public UsedTypes<  Use<MyVertex>           ::AsVertexType,
                                                                                                                                                                Use<MyEdge>                     ::AsEdgeType,
                                                                                                                                                                Use<MyFace>                     ::AsFaceType>{};


class MyVertex  : public Vertex< MyUsedTypes, vertex::Coord3f, vertex::BitFlags, vertex::Normal3f, vertex::Mark>{};
class MyEdge    : public Edge< MyUsedTypes, edge::VertexRef, edge::EVAdj> {};
class MyFace    : public Face  <MyUsedTypes, face::VertexRef,face::FFAdj, face::BitFlags, face::Normal3f> {};

class MyEdgeMesh: public vcg::edg::EdgeMesh< vector<MyVertex>, vector<MyEdge> > {};
class MyMesh : public tri::TriMesh< vector<MyVertex>, vector<MyFace > >{};


typedef vcg::GridStaticPtr<MyMesh::FaceType, MyMesh::ScalarType> TriMeshGrid;

int main(int argc,char ** argv)
{
        if (argc<6) 
        {
                printf("\n");
                printf("    Usage: trimesh_intersection <filename> <a> <b> <c> <d>\n\n");
                printf("       <filename>        Mesh model to intersect (PLY format).\n");
                printf("       <a> <b> <c> <d>   The coefficients that specifying a plane in the form:\n\n");
                printf("                             a*x + b*y + c*z + d = 0\n\n\n");

                printf("       Example: trimesh_intersection bunny.ply 0.0 1.0 0.0 0.0\n\n");

                return 0;
        }

        MyMesh m;

        // open a mesh
        int err = tri::io::Importer<MyMesh>::Open(m,argv[1]);
        if(err) 
        {
                printf("Error in reading %s: '%s'\n",argv[1],tri::io::Importer<MyMesh>::ErrorMsg(err));
                exit(-1);  
        }

        // some cleaning to get rid of bad file formats like stl that duplicate vertexes..
        int dup = tri::Clean<MyMesh>::RemoveDuplicateVertex(m);
        int unref =  tri::Clean<MyMesh>::RemoveUnreferencedVertex(m);

        if (dup > 0 || unref > 0)
                printf("Removed %i duplicate and %i unreferenced vertices from mesh %s\n",dup,unref,argv[1]);

        // Compute cross-intersection with the given plane

        MyMesh::ScalarType a = static_cast<MyMesh::ScalarType>(atof(argv[2]));
        MyMesh::ScalarType b = static_cast<MyMesh::ScalarType>(atof(argv[3]));
        MyMesh::ScalarType c = static_cast<MyMesh::ScalarType>(atof(argv[4]));
        MyMesh::ScalarType d = static_cast<MyMesh::ScalarType>(atof(argv[5]));

        vcg::Point3<MyMesh::ScalarType> direction(a, b, c);
        MyMesh::ScalarType distance = -d / direction.Norm();
        direction.Normalize();

        vcg::Plane3<MyMesh::ScalarType> plane(distance, direction);

        double avg_length;     // average length of the edges
        MyEdgeMesh edge_mesh;  // returned EdgeMesh (i.e. the cross-section)

        // Create a static grid (for fast indexing) and fill it
        TriMeshGrid static_grid;
        static_grid.Set(m.face.begin(), m.face.end());
        std::vector<TriMeshGrid::Cell *> intersected_cells;

        vcg::Intersection<MyMesh, MyEdgeMesh, MyMesh::ScalarType, TriMeshGrid>(plane, 
                edge_mesh, avg_length, &static_grid, intersected_cells);

        // Compute bounding box
        vcg::edg::UpdateBounding<MyEdgeMesh>::Box(edge_mesh);

        // export the cross-section
  edg::io::SVGProperties pro;
  if (edg::io::ExporterSVG<MyEdgeMesh>::Save(edge_mesh, "out.svg",pro))
                printf("    The cross-intersection has been successfully saved (OUT.SVG).\n");
        else
                printf("    The cross-intersection cannot be saved.\n");


        return 0;
}

---

vcglib
Author(s): Christian Bersch
autogenerated on Fri Jan 11 09:18:15 2013