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Helpers.h
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#include <iostream> // for cout and cin
#include <stdlib.h> /* abs */
#include <vector>
#include <array>
#include <math.h> /* sqrt */
#include <string>
double sum_coo(std::array<double, 3> a);
std::array<double, 3> colMax(std::vector<std::array<double, 3>> a);
std::array<double, 3> colMin(std::vector<std::array<double, 3>> a);
double dot(std::array<double, 3> a, std::array<double, 3> b);
std::array<double, 3> cross(std::array<double, 3> a,std::array<double, 3> b);
std::array<double, 3> minus(std::array<double, 3> a, std::array<double, 3> b);
void normalize(std::array<double, 3>& v);
double randZO();
std::array<double, 3> getRandOrth(std::array<double, 3> a);
double isLeft( std::array<double, 3> P0,std::array<double, 3> P1, std::array<double, 3> P2 );
std::array<double, 3> faceNormal( std::array<double, 3> V0,std::array<double, 3> V1, std::array<double, 3> V2 );
void printArray(std::array<double, 3> v);