normal.h

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/***************************************************************************
 *   Copyright (C) 1998-2010 by authors (see AUTHORS.txt )                 *
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
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 ***************************************************************************/

#ifndef _LUXRAYS_NORMAL_H
#define _LUXRAYS_NORMAL_H

#include "luxrays/core/geometry/vector.h"

namespace luxrays {

class Normal {
public:
        // Normal Methods

        Normal(float _x = 0, float _y = 0, float _z = 0)
        : x(_x), y(_y), z(_z) {
        }

        Normal operator-() const {
                return Normal(-x, -y, -z);
        }

        Normal operator+(const Normal &v) const {
                return Normal(x + v.x, y + v.y, z + v.z);
        }

        Normal & operator+=(const Normal &v) {
                x += v.x;
                y += v.y;
                z += v.z;
                return *this;
        }

        Normal operator-(const Normal &v) const {
                return Normal(x - v.x, y - v.y, z - v.z);
        }

        Normal & operator-=(const Normal &v) {
                x -= v.x;
                y -= v.y;
                z -= v.z;
                return *this;
        }

        Normal operator*(float f) const {
                return Normal(f*x, f*y, f * z);
        }

        Normal & operator*=(float f) {
                x *= f;
                y *= f;
                z *= f;
                return *this;
        }

        Normal operator/(float f) const {
                float inv = 1.f / f;
                return Normal(x * inv, y * inv, z * inv);
        }

        Normal & operator/=(float f) {
                float inv = 1.f / f;
                x *= inv;
                y *= inv;
                z *= inv;
                return *this;
        }

        float LengthSquared() const {
                return x * x + y * y + z*z;
        }

        float Length() const {
                return sqrtf(LengthSquared());
        }

        explicit Normal(const Vector &v) : x(v.x), y(v.y), z(v.z) {
        }

        float operator[](int i) const {
                return (&x)[i];
        }

        float &operator[](int i) {
                return (&x)[i];
        }
        // Normal Public Data
        float x, y, z;
};

inline Normal operator*(float f, const Normal &n) {
        return Normal(f * n.x, f * n.y, f * n.z);
}

inline Vector::Vector(const Normal &n)
        : x(n.x), y(n.y), z(n.z) {
}

inline std::ostream &operator<<(std::ostream &os, const Normal &v) {
        os << "Normal[" << v.x << ", " << v.y << ", " << v.z << "]";
        return os;
}

inline Normal Normalize(const Normal &n) {
        return n / n.Length();
}

inline float Dot(const Normal &n1, const Normal &n2) {
        return n1.x * n2.x + n1.y * n2.y + n1.z * n2.z;
}

inline float AbsDot(const Normal &n1, const Normal &n2) {
        return fabsf(n1.x * n2.x + n1.y * n2.y + n1.z * n2.z);
}

}

#endif  /* _LUXRAYS_NORMAL_H */

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