exampleQuickHull3D.cpp File Reference

#include "DGtal/base/Common.h"
#include "DGtal/geometry/volumes/ConvexityHelper.h"
#include "DGtal/shapes/SurfaceMesh.h"
#include "DGtal/io/writers/SurfaceMeshWriter.h"
#include "ConfigExamples.h"

Include dependency graph for exampleQuickHull3D.cpp:

Go to the source code of this file.

Functions
double	rand01 ()
	[QuickHull3D-Includes] More...
int	main (int argc, char *argv[])

Detailed Description

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Author

Jacques-Olivier Lachaud (jacqu.nosp@m.es-o.nosp@m.livie.nosp@m.r.la.nosp@m.chaud.nosp@m.@uni.nosp@m.v-sav.nosp@m.oie..nosp@m.fr ) Laboratory of Mathematics (CNRS, UMR 5127), University of Savoie, France

Date

2021/01/01

An example file named exampleQuickHull3D.

This file is part of the DGtal library.

Definition in file exampleQuickHull3D.cpp.

Function Documentation

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 87 of file exampleQuickHull3D.cpp.

{
  int precision = argc > 1 ? atoi( argv[ 1 ] ) : 100;  // precision
  std::string inputFilename = argc > 2
    ? std::string( argv[ 2 ] )
    : examplesPath + "samples/bunny.dat" ;
  std::vector< RealPoint > points;
  std::ifstream finput( inputFilename.c_str() );
  std::string linestr;
  while ( std::getline( finput, linestr ) )
    {
      std::istringstream iss( linestr );
      double a, b, c;
      if ( ! (iss >> a >> b >> c) ) break;
      points.push_back( RealPoint( a, b, c ) );
    }
  trace.info() << "Read " << points.size() << " 3D points." << std::endl;
 
  // Build rational polytope
  typedef ConvexityHelper< 3 > Helper;
  const auto polytope
    = Helper::computeRationalPolytope( points, precision );
  trace.info() << polytope << std::endl;
 
  // Build the boundary of the convex hull as a surface mesh
  SurfaceMesh< RealPoint, RealVector > mesh;
  bool ok = Helper::computeConvexHullBoundary( mesh, points, precision );
  trace.info() << mesh << std::endl;
  std::ofstream out( "qhull-mesh.obj" );
  SurfaceMeshWriter< RealPoint, RealVector >::writeOBJ( out, mesh );
  out.close();
 
  // Build the boundary of the convex hull as a polygonal surface
  PolygonalSurface< RealPoint > polysurf;
  bool ok2 = Helper::computeConvexHullBoundary( polysurf, points, precision );
  trace.info() << polysurf << std::endl;
 
  // Build the convex hull as a convex cell complex.
  ConvexCellComplex< RealPoint > cvx_complex;
  bool ok3 = Helper::computeConvexHullCellComplex( cvx_complex, points, precision );
  trace.info() << cvx_complex << std::endl;
  
  return ( ok && ok2 && ok3 ) ? 0 : 1;
} 

References DGtal::Trace::info(), DGtal::trace, and DGtal::SurfaceMeshWriter< TRealPoint, TRealVector >::writeOBJ().

rand01()

double rand01

(

)

[QuickHull3D-Includes]

[QuickHull3D-Includes]

Examples

geometry/tools/exampleQuickHull3D.cpp, geometry/tools/exampleRationalBallQuickHull3D.cpp, and geometry/volumes/pConvexity-benchmark.cpp.

Definition at line 83 of file exampleQuickHull3D.cpp.

{ return (double) rand() / (double) RAND_MAX; }