triangle.h

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#pragma once
#include "vector.h"
#include "matrix.h"
namespace GOAT
{
    namespace raytracing
    {
        class triangle
        {
        public:
            double u, v; 
            maths::Vector<double> P[3];  
            maths::Vector<double> n;     
            maths::Vector<double> f[3];  

            double area()
            {
                maths::Vector<double> h1, h2;
                h1 = P[1] - P[0];
                h2 = P[2] - P[0];
                return abs(h1 % h2) / 2.0;
            }
 
            void calcSideVectors()  
            {
                f[0] = P[1] - P[0];
                f[1] = P[2] - P[1];
                f[2] = P[0] - P[2];
            }
            double distance(maths::Vector<double> p, maths::Vector<double> k);
            int calcIntersectionPoint(maths::Vector<double> r, maths::Vector<double> k, maths::Vector<double>& p, double  eps = 1E-5);
            int calcIntersectionPoint(maths::Vector<double> r, maths::Vector<double> k, double& t, maths::Vector<double>& p, double  eps = 1E-5);
            void setnorm(void);   
            void setnorm(maths::Vector<double> n) { this->n = n; } 
            maths::Vector<double>  getnorm(void); 
            triangle();
            triangle(maths::Vector<double> P1, maths::Vector<double> P2, maths::Vector<double> P3);
            triangle(maths::Vector<double> ip1, maths::Vector<double> ip2, maths::Vector<double> ip3, maths::Vector<double> P);
            triangle(const triangle& d); 
            maths::Vector<double>& operator[](int i);
            const maths::Vector<double>& operator[](int i) const; 
            triangle& operator=(const triangle& dr); 
            void binWrite(std::ofstream& os);
            void binRead(std::ifstream& is);
            ~triangle(); 
            friend class surface;
        };
 
        std::ostream& operator << (std::ostream& os, const triangle& dr);
        triangle operator + (const triangle& dr, const maths::Vector<double>& v); 
        triangle operator - (const triangle& dr, const maths::Vector<double>& v); 
        triangle operator + (const maths::Vector<double>& v, const triangle& dr); 
        triangle operator - (const maths::Vector<double>& v, const triangle& dr); 
        triangle operator * (const maths::Matrix<double>& M, const triangle& dr); 
        triangle operator * (const triangle& dr, double a); 
        triangle operator * (double a, const triangle& dr); 
        triangle operator / (const triangle& dr, double a); 
    }
}