\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - Scale-Space Surface Reconstruction

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Scale_space_reconstruction_3/scale_space_incremental.cpp
#include <fstream>
#include <iostream>
#include <algorithm>
#include <CGAL/Scale_space_surface_reconstruction_3.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/IO/read_off_points.h>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef CGAL::Scale_space_surface_reconstruction_3< Kernel > Reconstruction;
typedef Reconstruction::Point Point;
typedef std::vector< Point > Point_collection;
typedef Reconstruction::Triple_const_iterator Triple_iterator;
// function for writing the reconstruction output in the off format
void dump_reconstruction(const Reconstruction& reconstruct, std::string name)
{
std::ofstream output(name.c_str());
output << "OFF " << reconstruct.number_of_points() << " "
<< reconstruct.number_of_triangles() << " 0\n";
std::copy(reconstruct.points_begin(),
reconstruct.points_end(),
std::ostream_iterator<Point>(output,"\n"));
for( Triple_iterator it = reconstruct.surface_begin(); it != reconstruct.surface_end(); ++it )
output << "3 " << *it << std::endl;
}
int main(int argc, char* argv[]) {
// Read the data.
Point_collection points;
if (argc!=2){
std::cerr << "Error, no input file provided\n";
return 1;
}
std::ifstream in(argv[1]);
std::cout << "Reading " << std::flush;
if( !in || !CGAL::read_off_points( in, std::back_inserter( points ) ) ) {
std::cerr << "Error: cannot read file" << std::endl;
return EXIT_FAILURE;
}
std::cout << "done: " << points.size() << " points." << std::endl;
// Construct the reconstruction with parameters for
// the neighborhood squared radius estimation.
Reconstruction reconstruct( 10, 100 );
// Add the points.
reconstruct.insert( points.begin(), points.end() );
// Advance the scale-space several steps.
// This automatically estimates the scale-space.
reconstruct.increase_scale( 2 );
// Reconstruct the surface from the current scale-space.
std::cout << "Neighborhood squared radius is "
<< reconstruct.neighborhood_squared_radius() << std::endl;
reconstruct.reconstruct_surface();
std::cout << "First reconstruction done." << std::endl;
// Write the reconstruction.
dump_reconstruction(reconstruct, "reconstruction1.off");
// Advancing the scale-space further and visually compare the reconstruction result
reconstruct.increase_scale( 2 );
// Reconstruct the surface from the current scale-space.
std::cout << "Neighborhood squared radius is "
<< reconstruct.neighborhood_squared_radius() << std::endl;
reconstruct.reconstruct_surface();
std::cout << "Second reconstruction done." << std::endl;
// Write the reconstruction.
dump_reconstruction(reconstruct, "reconstruction2.off");
std::cout << "Reconstructions are ready to be examinated in your favorite viewer" << std::endl;
return EXIT_SUCCESS;
}