onb.h

// onb.h

#ifndef _ONB_H_
#define _ONB_H_ 1

#include "vector3.h"

class ONB {
    public:
        ONB() {};
        ONB(const Vector3& a, const Vector3& b, const Vector3& c)
        { U = a; V = b; W = c; }

        void initFromU(const Vector3& u);
        void initFromV(const Vector3& v);
        void initFromW(const Vector3& w);

        void set(const Vector3& a, const Vector3& b, const Vector3& c)
        { U = a; V = b; W = c; }

        // ONB from 2 vectors, 
        // first is fixed and normalized
        // second is normalized adjusted
        void initFromUV(const Vector3& u, const Vector3& v);
        void initFromVU(const Vector3& v, const Vector3& u);
        void initFromUW(const Vector3& u, const Vector3& w);
        void initFromWU(const Vector3& w, const Vector3& u);
        void initFromVW(const Vector3& v, const Vector3& w);
        void initFromWV(const Vector3& w, const Vector3& v);

        friend std::istream& operator>>(std::istream& is, ONB& t);
        friend std::ostream& operator<<(std::ostream& os, const ONB& t);
        friend bool operator==(const ONB& t1, const ONB& t2);

        Vector3 u() const { return U; }
        Vector3 v() const { return V; }
        Vector3 w() const { return W; }

        Vector3 U, V ,W;
};

#endif // _ONB_H_