DGtal  1.4.beta
digitalPolyhedronBuilder3D.cpp
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1 
30 namespace DGtal {
57 } // namespace DGtal {
58 
60 #include <iostream>
61 #include <queue>
62 #include "DGtal/base/Common.h"
63 #include "DGtal/helpers/StdDefs.h"
64 #include "DGtal/io/viewers/Viewer3D.h"
65 #include "DGtal/shapes/Shapes.h"
66 #include "DGtal/shapes/SurfaceMesh.h"
67 #include "DGtal/io/readers/SurfaceMeshReader.h"
68 #include "DGtal/geometry/volumes/DigitalConvexity.h"
69 #include "ConfigExamples.h"
70 
72 
73 using namespace std;
74 using namespace DGtal;
75 typedef Z3i::Space Space;
79 typedef Z3i::SCell SCell;
84 typedef std::vector<Point> PointRange;
85 
86 int main( int argc, char** argv )
87 {
88  trace.info() << "Usage: " << argv[ 0 ] << " <input.obj> <h> <view>" << std::endl;
89  trace.info() << "\tComputes a digital polyhedron from an OBJ file" << std::endl;
90  trace.info() << "\t- input.obj: choose your favorite mesh" << std::endl;
91  trace.info() << "\t- h [==1]: the digitization gridstep" << std::endl;
92  trace.info() << "\t- view [==7]: display vertices(1), edges(2), faces(4)" << std::endl;
93  string filename = examplesPath + "samples/lion.obj";
94  std::string fn = argc > 1 ? argv[ 1 ] : filename; //< vol filename
95  double h = argc > 2 ? atof( argv[ 2 ] ) : 1.0;
96  int view = argc > 3 ? atoi( argv[ 3 ] ) : 7;
97  // Read OBJ file
98  std::ifstream input( fn.c_str() );
100  bool ok = SurfaceMeshReader< RealPoint, RealVector >::readOBJ( input, surfmesh );
101  if ( ! ok )
102  {
103  trace.error() << "Unable to read obj file : " << fn << std::endl;
104  return 1;
105  }
106 
107  QApplication application(argc,argv);
108  typedef Viewer3D<Space,KSpace> MViewer;
109  MViewer viewer;
110  viewer.setWindowTitle("digitalPolyhedronBuilder3D");
111  viewer.show();
112 
113  Point lo(-500,-500,-500);
114  Point up(500,500,500);
115  DigitalConvexity< KSpace > dconv( lo, up );
117 
118  auto vertices = std::vector<Point>( surfmesh.nbVertices() );
119  for ( auto v : surfmesh )
120  {
121  RealPoint p = (1.0 / h) * surfmesh.position( v );
122  Point q ( (Integer) round( p[ 0 ] ),
123  (Integer) round( p[ 1 ] ),
124  (Integer) round( p[ 2 ] ) );
125  vertices[ v ] = q;
126  }
127  std::set< Point > faces_set, edges_set;
128  auto faceVertices = surfmesh.allIncidentVertices();
129  auto edgeVertices = surfmesh.allEdgeVertices();
130 
131  trace.beginBlock( "Computing polyhedron" );
132  for ( int f = 0; f < surfmesh.nbFaces(); ++f )
133  {
134  PointRange X;
135  for ( auto v : faceVertices[ f ] )
136  X.push_back( vertices[ v ] );
137  auto F = dconv.envelope( X, Algorithm::DIRECT );
138  faces_set.insert( F.cbegin(), F.cend() );
139  }
140  for ( int e = 0; e < surfmesh.nbEdges(); ++e )
141  {
142  PointRange X =
143  { vertices[ edgeVertices[ e ].first ],
144  vertices[ edgeVertices[ e ].second ] };
145  auto E = dconv.envelope( X, Algorithm::DIRECT );
146  edges_set.insert( E.cbegin(), E.cend() );
147  }
148  trace.endBlock();
149  std::vector< Point > face_points, edge_points;
150  std::vector< Point > vertex_points = vertices;
151  std::sort( vertex_points.begin(), vertex_points.end() );
152  std::set_difference( faces_set.cbegin(), faces_set.cend(),
153  edges_set.cbegin(), edges_set.cend(),
154  std::back_inserter( face_points ) );
155  std::set_difference( edges_set.cbegin(), edges_set.cend(),
156  vertex_points.cbegin(), vertex_points.cend(),
157  std::back_inserter( edge_points ) );
158  auto total = vertex_points.size() + edge_points.size() + face_points.size();
159  trace.info() << "#vertex points=" << vertex_points.size() << std::endl;
160  trace.info() << "#edge points=" << edge_points.size() << std::endl;
161  trace.info() << "#face points=" << face_points.size() << std::endl;
162  trace.info() << "#total points=" << total << std::endl;
163 
164  // display everything
165  Color colors[] = { Color::Black, Color( 100, 100, 100 ), Color( 200, 200, 200 ) };
166  if ( view & 0x1 )
167  {
168  viewer.setLineColor( colors[ 0 ] );
169  viewer.setFillColor( colors[ 0 ] );
170  for ( auto p : vertices ) viewer << p;
171  }
172  if ( view & 0x2 )
173  {
174  viewer.setLineColor( colors[ 1 ] );
175  viewer.setFillColor( colors[ 1 ] );
176  for ( auto p : edge_points ) viewer << p;
177  }
178  if ( view & 0x4 )
179  {
180  viewer.setLineColor( colors[ 2 ] );
181  viewer.setFillColor( colors[ 2 ] );
182  for ( auto p : face_points ) viewer << p;
183  }
184  viewer << MViewer::updateDisplay;
185  return application.exec();
186 
187 }
188 // //
190 
Structure representing an RGB triple with alpha component.
Definition: Color.h:68
PointRange envelope(const PointRange &Z, EnvelopeAlgorithm algo=EnvelopeAlgorithm::DIRECT) const
Aim: This class is a model of CCellularGridSpaceND. It represents the cubical grid as a cell complex,...
std::ostream & error()
void beginBlock(const std::string &keyword="")
std::ostream & info()
double endBlock()
virtual void show()
Overload QWidget method in order to add a call to updateList() method (to ensure that the lists are w...
Space::Point Point
int main(int argc, char **argv)
Z3i::Integer Integer
Z3i::KSpace KSpace
Z3i::SCell SCell
std::vector< Point > PointRange
Space::Vector Vector
Z3i::Space Space
Space::RealPoint RealPoint
Z3i::Domain Domain
Space::RealVector RealVector
DGtal::int32_t Integer
Definition: StdDefs.h:143
DGtal is the top-level namespace which contains all DGtal functions and types.
Trace trace
Definition: Common.h:154
Represents a signed cell in a cellular grid space by its Khalimsky coordinates and a boolean value.
Aim: An helper class for reading mesh files (Wavefront OBJ at this point) and creating a SurfaceMesh.
Aim: Represents an embedded mesh as faces and a list of vertices. Vertices may be shared among faces ...
Definition: SurfaceMesh.h:92
RealPoint & position(Vertex v)
Definition: SurfaceMesh.h:637
const std::vector< VertexPair > & allEdgeVertices() const
Definition: SurfaceMesh.h:381
Size nbFaces() const
Definition: SurfaceMesh.h:288
Size nbEdges() const
Definition: SurfaceMesh.h:284
const std::vector< Vertices > & allIncidentVertices() const
Definition: SurfaceMesh.h:362
Size nbVertices() const
Definition: SurfaceMesh.h:280
MyPointD Point
Definition: testClone2.cpp:383