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Fix iterator determinism in Poisson

This commit is contained in:
Simon Giraudot 2020-03-30 15:47:45 +02:00
parent 6ae64e7a73
commit 0409e2b48d
1 changed files with 12 additions and 20 deletions
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32
Poisson_surface_reconstruction_3/include/CGAL/Poisson_reconstruction_function.h
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@ -47,6 +47,7 @@
#include <boost/array.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/iterator/indirect_iterator.hpp>
/*!
\file Poisson_reconstruction_function.h
@ -104,18 +105,6 @@ struct Poisson_visitor {
{}
};
struct Poisson_skip_vertices {
double ratio;
Poisson_skip_vertices(const double ratio = 0)
: ratio(ratio) {}
template <typename Iterator>
bool operator()(Iterator it) const {
// make the result deterministic for each iterator
return Random((std::size_t)(&*it)).get_double() < ratio;
}
};
// Given f1 and f2, two sizing fields, that functor wrapper returns
// max(f1, f2*f2)
// The wrapper stores only pointers to the two functors.
@ -415,9 +404,15 @@ public:
// then the cell is considered as small enough, and the first sizing
// field, more costly, is not evaluated.
typedef Filter_iterator<typename Triangulation::Input_point_iterator,
Poisson_skip_vertices> Some_points_iterator;
Poisson_skip_vertices skip(1.-approximation_ratio);
//make it deterministic
Random random(0);
double ratio = 1.-approximation_ratio;
std::vector<typename Triangulation::Input_point_iterator> some_points;
for (typename Triangulation::Input_point_iterator
it = m_tr->input_points_begin(); it != m_tr->input_points_end(); ++ it)
if (random.get_double() >= ratio)
some_points.push_back (it);
CGAL_TRACE_STREAM << "SPECIAL PASS that uses an approximation of the result (approximation ratio: "
<< approximation_ratio << ")" << std::endl;
@ -425,11 +420,8 @@ public:
CGAL::Timer sizing_field_timer; sizing_field_timer.start();
Poisson_reconstruction_function<Geom_traits>
coarse_poisson_function(Some_points_iterator(m_tr->input_points_end(),
skip,
m_tr->input_points_begin()),
Some_points_iterator(m_tr->input_points_end(),
skip),
coarse_poisson_function(boost::make_indirect_iterator (some_points.begin()),
boost::make_indirect_iterator (some_points.end()),
Normal_of_point_with_normal_map<Geom_traits>() );
coarse_poisson_function.compute_implicit_function(solver, Poisson_visitor(),
0.);