triplet.h

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//
// triplet.h
//     Classes and functions for triplets of three points and
//     computing their dissimilarity.
//
// Author:  Jens Wilberg, Lukas Aymans, Christoph Dalitz
// Date:    2018-08-30
// License: see ../LICENSE
//
 
#ifndef TRIPLET_H
#define TRIPLET_H
 
#include "pointcloud.h"
 
#include <cstddef>
#include <vector>
 
// triplet of three points
struct triplet {
   size_t point_index_a;
   size_t point_index_b;
   size_t point_index_c;
   Point center;
   Point direction;
   double error;
   friend bool operator<(const triplet &t1, const triplet &t2) { return (t1.error < t2.error); };
};
 
// dissimilarity for triplets.
// scale is an external scale factor.
class ScaleTripletMetric {
private:
   double scale;
 
public:
   ScaleTripletMetric(double s);
   double operator()(const triplet &lhs, const triplet &rhs);
};
 
// generates triplets from PointCloud
void generate_triplets(const PointCloud &cloud, std::vector<triplet> &triplets, size_t k, size_t n, double a);
#endif