1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/random_simplify_point_set.h>
#include <CGAL/IO/read_xyz_points.h>
#include <CGAL/IO/write_xyz_points.h>
#include <vector>
#include <fstream>
#include <iostream>
// types
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::Point_3 Point;
int main(int argc, char*argv[])
{
const char* fname = (argc>1)?argv[1]:"data/oni.xyz";
// Reads a .xyz point set file in points[].
std::vector<Point> points;
std::ifstream stream(fname);
if (!stream ||
!CGAL::read_xyz_points(stream, std::back_inserter(points)))
{
std::cerr << "Error: cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
// Randomly simplifies using erase-remove idiom
const double removed_percentage = 97.0; // percentage of points to remove
points.erase(CGAL::random_simplify_point_set(points.begin(), points.end(), removed_percentage),
points.end());
// Optional: after erase(), use Scott Meyer's "swap trick" to trim excess capacity
std::vector<Point>(points).swap(points);
// Saves point set.
// Note: write_xyz_points_and_normals() requires an output iterator
// over points as well as property maps to access each
// point position and normal.
std::ofstream out((argc>2)?argv[2]:"Three_lady_copy.xyz");
if (!out ||
!CGAL::write_xyz_points(
out, points.begin(), points.end()))
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
|
