text:
#ifndef POINT3_H__
#define POINT3_H__

#include <cassert>
#include <algorithm>
#include <iostream>
#include <vector>
#include <cmath>
#include <float.h>

/*
If you want to use the methods that project 2x2 or 3x3 matrices
onto the closest 2D/3D rotation, or similarity, or rotation
restricted to a 2D plane in 3D, you need to use a Singular Values Decomposition.
We provide implementation of this, using the GNU Scientific Library.
Uncomment #define __USE_GSL_FOR_MAT33
*/

#define __USE_GSL_FOR_MAT33
#define __USE_OPENGL_METHODS_ON_POINT3

#ifdef __USE_GSL_FOR_MAT33
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_linalg.h>
// you need to add the following libraries to your project : gsl, gslcblas
#endif

#ifdef __USE_OPENGL_METHODS_ON_POINT3
#include <GL/gl.h>
#endif

template< typename T >
class point3
{
public:
    typedef T               type_t;

    point3< T >( T x_ , T y_ , T z_) { v[0] = x_; v[1] = y_; v[2] = z_; }

    template< class point_t > point3< T >( point_t const & p )
    {
        v[0] = (T)(p[0]);
        v[1] = (T)(p[1]);
        v[2] = (T)(p[2]);
    }

    point3< T >(){v[0] = 0; v[1] = 0; v[2] = 0;}

    inline  T x() const {return v[0];}
    inline  T y() const {return v[1];}
    inline  T z() const {return v[2];}

    inline  T operator [] (unsigned int c) const
    {
        return v[c];
    }
    inline  T & operator [] (unsigned int c)
    {
        return v[c];
    }

    static point3<T> Zero() { return point3<T>(0,0,0); }

    void setZero()
    {
        v[0] = 0;
        v[1] = 0;
        v[2] = 0;
    }

    // You cannot template over anything here, but maybe you could template over typename T2 for operator += (const point3< T2 > & other)
    void operator += (const point3< T > & other)
    {
        v[0] += other.x();
        v[1] += other.y();
        v[2] += other.z();
    }
    void operator -= (const point3< T > & other)
    {
        v[0] -= other.x();
        v[1] -= other.y();
        v[2] -= other.z();
    }

    // This is going to create problems if the compiler needs to resolve umbiguous casts, but it's the cleaner way to do it
    void operator *= (int s)
    {
        v[0] *= s;
        v[1] *= s;
        v[2] *= s;
    }
    void operator *= (unsigned int s)
    {
        v[0] *= s;
        v[1] *= s;
        v[2] *= s;
    }
    void operator *= (float s)
    {
        v[0] *= s;
        v[1] *= s;
        v[2] *= s;
    }
    void operator *= (double s)
    {
        v[0] *= s;
        v[1] *= s;
        v[2] *= s;
    }
    void operator /= (int s)
    {
        v[0] /= s;
        v[1] /= s;
        v[2] /= s;
    }
    void operator /= (unsigned int s)
    {
        v[0] /= s;
        v[1] /= s;
        v[2] /= s;
    }
    void operator /= (float s)
    {
        v[0] /= s;
        v[1] /= s;
        v[2] /= s;
    }
    void operator /= (double s)
    {
        v[0] /= s;
        v[1] /= s;
        v[2] /= s;
    }

    point3<T> getOrthogonal() const
    {
        if( v[0] == 0 )
        {
            return point3<T>( 0 , v[2] , -v[1] );
        }
        else if( v[1] == 0 )
        {
            return point3<T>( v[2] , 0 , -v[0] );
        }

        return point3<T>( v[1] , -v[0] , 0 );
    }

    T sqrnorm() const
    {
        return v[0]*v[0]+v[1]*v[1]+v[2]*v[2];
    }
    T norm() const
    {
        return sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]);
    }

    void normalize()
    {
        T _n = norm();
        v[0] /= _n;
        v[1] /= _n;
        v[2] /= _n;
    }
    void setNorm( T newNorm )
    {
        T _factor = newNorm / norm();
        v[0] *= _factor;
        v[1] *= _factor;
        v[2] *= _factor;
    }

    inline static
    T dot( const point3< T > & p1 , const point3< T > & p2 )
    {
        return p1.x() * p2.x() + p1.y() * p2.y() + p1.z() * p2.z();
    }

    inline static
    point3< T > cross( const point3< T > & p1 , const point3< T > & p2 )
    {
        return point3< T >(
                    p1.y() * p2.z() - p1.z() * p2.y(),
                    p1.z() * p2.x() - p1.x() * p2.z(),
                    p1.x() * p2.y() - p1.y() * p2.x()
                    );
    }

//    inline static point3< T > min ( const point3< T >  & p , const point3< T >  & p2 )
//    {
//        return point3< T >( std::min( p2[0] , p[0] ),
//                            std::min( p2[1] , p[1] ),
//                            std::min( p2[2] , p[2] ) );
//    }

//    inline static point3< T > max ( point3< T > const & p , point3< T > const & p2 )
//    {
//        return point3< T >( std::max( p2[0] , p[0] ),
//                            std::max( p2[1] , p[1] ),
//                            std::max( p2[2] , p[2] ) );
//    }

    template< class point_t1 , class point_t2 >
    inline static point3< T > min ( const point_t1  & p , const point_t2  & p2 )
    {
        return point3< T >( std::min( (T)(p2[0]) , (T)(p[0]) ),
                            std::min( (T)(p2[1]) , (T)(p[1]) ),
                            std::min( (T)(p2[2]) , (T)(p[2]) ) );
    }

    template< class point_t1 , class point_t2 >
    inline static point3< T > max ( const point_t1  & p , const point_t2  & p2 )
    {
        return point3< T >( std::max( (T)(p2[0]) , (T)(p[0]) ),
                            std::max( (T)(p2[1]) , (T)(p[1]) ),
                            std::max( (T)(p2[2]) , (T)(p[2]) ) );
    }

    inline static point3< T > Rand ( point3< T > const & p , point3< T > const & p2 )
    {
        T rx = p[0] + (p2[0] - p[0]) * (float)(rand()) / (float)( RAND_MAX );
        T ry = p[1] + (p2[1] - p[1]) * (float)(rand()) / (float)( RAND_MAX );
        T rz = p[2] + (p2[2] - p[2]) * (float)(rand()) / (float)( RAND_MAX );
        return point3<T>( rx , ry , rz );
    }
    inline static point3< T > Rand ( double randMagnitude )
    {
        T rx = randMagnitude * (2.0*(float)(rand()) / (float)( RAND_MAX ) - 1.0);
        T ry = randMagnitude * (2.0*(float)(rand()) / (float)( RAND_MAX ) - 1.0);
        T rz = randMagnitude * (2.0*(float)(rand()) / (float)( RAND_MAX ) - 1.0);
        return point3<T>( rx , ry , rz );
    }

    //    inline static point3< T > RandOrientation (  )
    //    {
    //        T rx = -1.f + 2.f * (float)(rand()) / (float)( RAND_MAX );
    //        T ry = -1.f + 2.f * (float)(rand()) / (float)( RAND_MAX );
    //        T rz = -1.f + 2.f * (float)(rand()) / (float)( RAND_MAX );
    //        point3<T> orientation( rx , ry , rz );
    //        orientation.normalize();
    //        return orientation;
    //    }

    //    Choose z uniformly distributed in [-1,1].
    //    Choose t uniformly distributed on [0, 2*pi).
    //    Let r = sqrt(1-z^2).
    //    Let x = r * cos(t).
    //    Let y = r * sin(t).
    inline static point3< T > RandOrientation (  )
    {
        T zz = -1.f + 2.f * (float)(rand()) / (float)( RAND_MAX );
        T tt = 2.f * M_PI * (float)(rand()) / (float)( RAND_MAX );
        T rr = sqrt( 1.0 - zz*zz );
        T xx = rr * cos(tt);
        T yy = rr * sin(tt);
        return point3<T>( xx , yy , zz );
    }
    inline static point3< T > RandInBox ( double boxHalfSide = 1.0 )
    {
        T xx = boxHalfSide*(-1.0 + 2.0 * (double)(rand()) / (double)( RAND_MAX ));
        T yy = boxHalfSide*(-1.0 + 2.0 * (double)(rand()) / (double)( RAND_MAX ));
        T zz = boxHalfSide*(-1.0 + 2.0 * (double)(rand()) / (double)( RAND_MAX ));
        return point3<T>( xx , yy , zz );
    }

    point3<T> direction() const {
        T n = norm();
        return *this/n;
    }

    static
    T getAngleAroundAxis( point3<T> const & srcVector , point3<T> const & rotatedVector , point3<T> const & axis ) {
//        double angle = atan2( std::max<double>(-1.0 , std::min<double>( 1.0 , point3<T>::cross(srcVector , rotatedVector).norm() ) ) ,
//                              std::max<double>(-1.0 , std::min<double>( 1.0 , point3<T>::dot(srcVector , rotatedVector) ) )); // aie aie aie aie aie aie aie aie...
        double angle = atan2( point3<T>::cross(srcVector , rotatedVector).norm() , point3<T>::dot(srcVector , rotatedVector) );
        if( point3<T>::dot(point3<T>::cross(srcVector , rotatedVector) , axis) < 0.0 ) angle = -angle;
        return angle;
    }

    bool isnan() const {
        return std::isnan(v[0]) || std::isnan(v[1]) || std::isnan(v[2]);
    }

    inline static void glVertex( point3< T > const & p )
    {
        glVertex3f( p[0],p[1],p[2] );
    }

    inline static void glNormal( point3< T > const & p )
    {
        glNormal3f( p[0],p[1],p[2] );
    }

    void glVertex() const
    {
        glVertex3f( v[0],v[1],v[2] );
    }

    void glNormal() const
    {
        glNormal3f( v[0],v[1],v[2] );
    }

private:
    T v[3];
};

template< typename T > inline
point3< T > operator + (const point3< T > & p1 , const point3< T > & p2 )
{
    return point3< T >( p1.x() + p2.x() , p1.y() + p2.y() , p1.z() + p2.z() );
}
template< typename T > inline
point3< T > operator - (const point3< T > & p1 , const point3< T > & p2 )
{
    return point3< T >( p1.x() - p2.x() , p1.y() - p2.y() , p1.z() - p2.z() );
}

template< typename T > inline
point3< T > operator - (const point3< T > & p2 )
{
    return point3< T >( - p2.x() , - p2.y() , - p2.z() );
}

template< typename T > inline
point3< T > operator * (const point3< T > & p , int s)
{
    return point3< T >( s*p.x() , s*p.y()  , s*p.z() );
}
template< typename T > inline
point3< T > operator * (const point3< T > & p , float s)
{
    return point3< T >( s*p.x() , s*p.y() , s*p.z()  );
}
template< typename T > inline
point3< T > operator * (const point3< T > & p , double s)
{
    return point3< T >( s*p.x() , s*p.y()  , s*p.z() );
}
template< typename T > inline
point3< T > operator * ( int s , const point3< T > & p )
{
    return point3< T >( s*p.x() , s*p.y()  , s*p.z() );
}
template< typename T > inline
point3< T > operator * ( float s , const point3< T > & p )
{
    return point3< T >( s*p.x() , s*p.y() , s*p.z()  );
}
template< typename T > inline
point3< T > operator * ( double s , const point3< T > & p )
{
    return point3< T >( s*p.x() , s*p.y()  , s*p.z() );
}

template< typename T > inline
point3< T > operator / (const point3< T > & p , int s)
{
    return point3< T >( p.x()/s , p.y()/s  , p.z()/s );
}
template< typename T > inline
point3< T > operator / (const point3< T > & p , float s)
{
    return point3< T >( p.x()/s , p.y()/s  , p.z()/s );
}
template< typename T > inline
point3< T > operator / (const point3< T > & p , double s)
{
    return point3< T >( p.x()/s , p.y()/s  , p.z()/s );
}

template< typename T > inline
T operator * (const point3< T > & p1 , const point3< T > & p2)
{
    return p1.x() * p2.x() + p1.y() * p2.y() + p1.z() * p2.z();
}

template< typename T > inline
point3<T> operator % (const point3<T> & p1 , const point3<T> & p2)
{
    return point3<T>::cross(p1,p2);
}

template< typename T > inline std::ostream & operator << (std::ostream & s , point3< T > const & p)
{
    s << p[0] << " \t" << p[1] << " \t" << p[2];
    return s;
}

typedef point3< float >    point3f;
typedef point3< double >   point3d;

inline double myAbs( const point3d & f )
{
    return f.norm();
}
inline float myAbs( const point3f & f )
{
    return f.norm();
}

namespace StochasticBoundingStruct{

// the 3 canonical axes  +  2000 random orientations on the z-positive hemisphere.
static double dirs[2003][3] =
{
    { 1 , 0 , 0 } ,
    { 0 , 1 , 0 } ,
    { 0 , 0 , 1 } ,
    { -0.385422 , 0.516128 , 0.764893 } ,    { 0.697097 , 0.110109 , 0.708471 } ,    { 0.311979 , 0.691569 , 0.651461 } ,    { -0.832093 , 0.481536 , 0.275217 } ,    { -0.572238 , 0.234887 , 0.78573 } ,    { -0.109098 , -0.971394 , 0.210928 } ,    { -0.902306 , 0.408123 , 0.138848 } ,    { -0.570128 , 0.632602 , 0.524185 } ,    { -0.66706 , -0.32457 , 0.670586 } ,    { 0.221621 , 0.376512 , 0.899513 } ,
    { 0.0314351 , -0.920669 , 0.389077 } ,    { -0.674986 , 0.509768 , 0.533415 } ,    { 0.453828 , 0.177408 , 0.87325 } ,    { 0.752111 , 0.29876 , 0.587429 } ,    { -0.920397 , -0.328854 , 0.21148 } ,    { 0.109396 , -0.64581 , 0.75562 } ,    { -0.971678 , 0.144991 , 0.186598 } ,    { 0.801684 , 0.447118 , 0.396721 } ,    { 0.879867 , -0.353183 , 0.317956 } ,    { -0.0950819 , -0.0321161 , 0.994951 } ,
    { 0.754686 , -0.608428 , 0.245486 } ,    { 0.777216 , -0.270578 , 0.568086 } ,    { -0.7292 , -0.217505 , 0.648814 } ,    { -0.925599 , 0.0634084 , 0.373158 } ,    { -0.0803568 , 0.968324 , 0.236416 } ,    { -0.641205 , 0.333491 , 0.691115 } ,    { 0.879154 , -0.475082 , 0.0372188 } ,    { 0.812369 , 0.459884 , 0.358556 } ,    { -0.751874 , -0.658148 , 0.0390828 } ,    { 0.676722 , -0.679121 , 0.284326 } ,
    { -0.0675079 , 0.746549 , 0.661897 } ,    { 0.637238 , 0.328494 , 0.697151 } ,    { -0.83858 , 0.254731 , 0.481556 } ,    { 0.587564 , -0.428267 , 0.686553 } ,    { -0.55295 , -0.804897 , 0.215376 } ,    { 0.0526419 , -0.425982 , 0.903199 } ,    { -0.0897022 , -0.991671 , 0.0924214 } ,    { -0.619757 , 0.654863 , 0.432499 } ,    { -0.884142 , -0.166764 , 0.436444 } ,    { -0.77648 , 0.56425 , 0.280537 } ,
    { 0.906532 , 0.0809475 , 0.414304 } ,    { 0.287072 , -0.706101 , 0.647311 } ,    { -0.610819 , -0.781133 , 0.129353 } ,    { -0.843402 , 0.493208 , 0.213117 } ,    { -0.854138 , -0.194333 , 0.482373 } ,    { -0.731727 , 0.356389 , 0.581001 } ,    { 0.747388 , -0.285504 , 0.599915 } ,    { 0.11617 , 0.0304004 , 0.992764 } ,    { -0.522105 , -0.826618 , 0.210022 } ,    { 0.109879 , -0.460211 , 0.880984 } ,
    { -0.723265 , 0.5825 , 0.37092 } ,    { 0.636892 , -0.762517 , 0.11374 } ,    { -0.13995 , 0.956635 , 0.255468 } ,    { -0.710729 , 0.454106 , 0.537263 } ,    { 0.772457 , 0.497738 , 0.39442 } ,    { -0.647809 , -0.444059 , 0.618996 } ,    { 0.411236 , 0.455686 , 0.789452 } ,    { 0.950792 , 0.24793 , 0.185808 } ,    { 0.259714 , -0.790225 , 0.555061 } ,    { -0.970326 , -0.225514 , 0.0872409 } ,
    { 0.0145111 , 0.740151 , 0.672285 } ,    { 0.654429 , 0.752727 , 0.0715813 } ,    { 0.76677 , -0.157146 , 0.622389 } ,    { 0.65972 , 0.383442 , 0.646329 } ,    { 0.715623 , 0.649749 , 0.256337 } ,    { -0.90427 , 0.34034 , 0.257809 } ,    { -0.173731 , 0.0844812 , 0.981163 } ,    { -0.517476 , -0.603214 , 0.60692 } ,    { -0.782505 , -0.174024 , 0.59783 } ,    { -0.99534 , -0.0242384 , 0.0933291 } ,
    { -0.598719 , 0.760331 , 0.251856 } ,    { 0.0705489 , 0.594529 , 0.800974 } ,    { -0.205445 , -0.00853607 , 0.978631 } ,    { -0.0940051 , 0.884794 , 0.456401 } ,    { 0.126101 , 0.913963 , 0.385707 } ,    { 0.494095 , 0.623035 , 0.606381 } ,    { -0.0340296 , 0.310029 , 0.950118 } ,    { 0.42724 , 0.710798 , 0.558777 } ,    { 0.849255 , -0.239664 , 0.470454 } ,    { -0.567892 , 0.657388 , 0.495317 } ,
    { -0.383365 , -0.354398 , 0.852897 } ,    { -0.799306 , -0.459051 , 0.387791 } ,    { -0.32595 , -0.268149 , 0.906561 } ,    { 0.012387 , 0.897792 , 0.440245 } ,    { 0.0740104 , -0.699068 , 0.711215 } ,    { 0.110024 , -0.857044 , 0.503358 } ,    { 0.575597 , -0.779886 , 0.245899 } ,    { -0.761359 , -0.648324 , 0.00304508 } ,    { -0.139983 , 0.948432 , 0.284397 } ,    { 0.494213 , 0.835043 , 0.241777 } ,
    { 0.412646 , 0.910886 , 0.00300169 } ,    { -0.778852 , 0.115545 , 0.616473 } ,    { 0.847906 , 0.520515 , 0.100597 } ,    { 0.381559 , 0.880646 , 0.280848 } ,    { -0.75984 , 0.644168 , 0.0876987 } ,    { -0.736586 , -0.669403 , 0.0966486 } ,    { 0.61001 , -0.792276 , 0.0136739 } ,    { -0.864806 , -0.302517 , 0.400742 } ,    { -0.32708 , 0.178495 , 0.927986 } ,    { 0.619961 , 0.50237 , 0.602721 } ,
    { -0.876188 , -0.303311 , 0.374562 } ,    { -0.241242 , 0.606737 , 0.757412 } ,    { 0.716436 , -0.670845 , 0.191536 } ,    { 0.0403957 , -0.533251 , 0.844992 } ,    { 0.229727 , -0.683459 , 0.692899 } ,    { 0.555794 , 0.818392 , 0.146037 } ,    { -0.0926963 , -0.995174 , 0.0321806 } ,    { -0.618159 , 0.273929 , 0.736778 } ,    { 0.105384 , -0.756296 , 0.645687 } ,    { 0.432666 , -0.480367 , 0.76292 } ,
    { 0.365927 , 0.635624 , 0.679764 } ,    { -0.124722 , -0.216931 , 0.968187 } ,    { -0.399871 , -0.915581 , 0.0425861 } ,    { 0.825642 , -0.076549 , 0.558977 } ,    { -0.607219 , -0.0839766 , 0.790084 } ,    { 0.257646 , -0.947904 , 0.187343 } ,    { -0.973859 , 0.170738 , 0.149824 } ,    { -0.601329 , 0.0792537 , 0.795061 } ,    { 0.700292 , 0.110759 , 0.705212 } ,    { 0.87532 , 0.033876 , 0.482355 } ,
    { -0.461323 , -0.816624 , 0.346854 } ,    { 0.351135 , -0.879064 , 0.322415 } ,    { -0.260794 , 0.945855 , 0.193246 } ,    { 0.129913 , 0.863015 , 0.488188 } ,    { 0.644597 , -0.753439 , 0.129708 } ,    { -0.153882 , -0.970458 , 0.185826 } ,    { -0.883671 , -0.464376 , 0.0589968 } ,    { -0.927063 , -0.306326 , 0.216147 } ,    { 0.668522 , 0.570521 , 0.477059 } ,    { -0.666277 , 0.742205 , 0.072155 } ,
    { 0.660494 , 0.701136 , 0.26862 } ,    { -0.185185 , -0.706877 , 0.682665 } ,    { -0.0684437 , 0.976522 , 0.204253 } ,    { 0.750589 , -0.219435 , 0.623269 } ,    { -0.816743 , 0.387197 , 0.427795 } ,    { 0.757362 , 0.648293 , 0.078222 } ,    { -0.427486 , -0.412167 , 0.804596 } ,    { 0.988097 , 0.00670096 , 0.153683 } ,    { 0.277227 , 0.484279 , 0.829831 } ,    { -0.88351 , 0.112915 , 0.454599 } ,
    { 0.14541 , -0.307944 , 0.940227 } ,    { 0.751495 , 0.294184 , 0.590518 } ,    { -0.498719 , -0.346624 , 0.794438 } ,    { 0.529421 , 0.819243 , 0.220353 } ,    { -0.493423 , -0.646572 , 0.581789 } ,    { 0.553122 , -0.831585 , 0.0502359 } ,    { 0.361316 , 0.817773 , 0.447994 } ,    { -0.321953 , 0.309534 , 0.894726 } ,    { 0.0257802 , 0.455535 , 0.889844 } ,    { -0.112102 , -0.935785 , 0.334276 } ,
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    { 0.929646 , 0.364663 , 0.0527114 } ,    { -0.667761 , -0.257242 , 0.698514 } ,    { 0.462495 , -0.0673398 , 0.884061 } ,    { -0.525039 , 0.381695 , 0.760686 } ,    { 0.683212 , -0.000564444 , 0.73022 } ,    { 0.420557 , 0.885192 , 0.198913 } ,    { -0.971449 , -0.194974 , 0.13517 } ,    { -0.746171 , 0.190546 , 0.637904 } ,    { 0.909071 , 0.416623 , 0.00380576 } ,    { -0.191327 , 0.285436 , 0.939106 } ,
    { 0.132169 , -0.414928 , 0.900203 } ,    { -0.663947 , -0.463146 , 0.587086 } ,    { 0.100529 , -0.992809 , 0.0649869 } ,    { -0.331074 , 0.403996 , 0.852747 } ,    { 0.707163 , 0.383667 , 0.593903 } ,    { -0.395927 , -0.79792 , 0.454495 } ,    { -0.497763 , 0.479399 , 0.722778 } ,    { 0.290656 , 0.833195 , 0.470431 } ,    { 0.715641 , 0.635401 , 0.290042 } ,    { 0.183316 , 0.963909 , 0.193069 } ,
    { 0.972824 , -0.0178622 , 0.230854 } ,    { 0.574369 , 0.178051 , 0.798998 } ,    { 0.0656519 , 0.326844 , 0.942795 } ,    { -0.98156 , -0.190474 , 0.0160997 } ,    { -0.795229 , -0.196193 , 0.57369 } ,    { 0.0793034 , 0.964727 , 0.251024 } ,    { 0.826061 , 0.460539 , 0.324848 } ,    { 0.50979 , -0.542397 , 0.667772 } ,    { -0.79576 , 0.522625 , 0.305988 } ,    { -0.845024 , -0.274884 , 0.458664 } ,
    { 0.962671 , -0.26935 , 0.0267422 } ,    { 0.591278 , 0.593062 , 0.546505 } ,    { -0.916858 , 0.223392 , 0.33086 } ,    { -0.28375 , -0.710783 , 0.64364 } ,    { -0.860743 , 0.484853 , 0.155043 } ,    { 0.201168 , 0.536951 , 0.819277 } ,    { -0.357849 , 0.918334 , 0.169135 } ,    { 0.802802 , -0.294537 , 0.518418 } ,    { -0.00727225 , -0.99845 , 0.0551767 } ,    { -0.124085 , 0.289568 , 0.94908 } ,
    { 0.527489 , -0.735428 , 0.425325 } ,    { 0.312386 , 0.312047 , 0.897241 } ,    { 0.383408 , -0.336884 , 0.859946 } ,    { 0.168695 , -0.985617 , 0.0100337 } ,    { 0.130254 , 0.800098 , 0.585557 } ,    { -0.138974 , 0.743561 , 0.654067 } ,    { 0.879539 , 0.309063 , 0.36179 } ,    { 0.584633 , 0.0569884 , 0.809294 } ,    { 0.0366785 , 0.246249 , 0.968512 } ,    { -0.759899 , -0.50441 , 0.410029 }
};

// just define how many of them you want to keep:
static unsigned int nDirs = 33;

class NDirectionalBS{
    unsigned int ndirs;
    std::vector< std::pair< double , double > > bounds;

    double minInterval , maxInterval;
    bool intervalsUpToDate;

    void updateIntervals()
    {
        minInterval = FLT_MAX;
        maxInterval = 0.0;
        for( unsigned int i = 0 ; i < ndirs ; ++i )
        {
            double interval = maxValue(i) - minValue(i);
            minInterval = std::min( minInterval , interval );
            maxInterval = std::max( maxInterval , interval );
        }
        intervalsUpToDate = true;
    }

public:
    NDirectionalBS()
    {
        ndirs = nDirs;
        bounds.resize(ndirs);
        for( unsigned int i = 0 ; i < ndirs ; ++i )
            bounds[i] = std::pair< double , double >( FLT_MAX , -FLT_MAX );

        intervalsUpToDate = true;
        minInterval = 0.0;
        maxInterval = 0.0;
    }
    NDirectionalBS( unsigned int n )
    {
        assert( n < nDirs );
        ndirs = n;
        bounds.resize(ndirs);
        for( unsigned int i = 0 ; i < ndirs ; ++i )
            bounds[i] = std::pair< double , double >( FLT_MAX , -FLT_MAX );

        intervalsUpToDate = true;
        minInterval = 0.0;
        maxInterval = 0.0;
    }

    void operator = ( const NDirectionalBS & rightSide )
    {
        ndirs = rightSide.ndirs;
        bounds = rightSide.bounds;
        minInterval = rightSide.minInterval;
        maxInterval = rightSide.maxInterval;
        intervalsUpToDate = rightSide.intervalsUpToDate;
    }

    void set( const point3d & p )
    {
        for( unsigned int i = 0 ; i < ndirs ; ++i )
        {
            double dirPos = dirs[i][0]*p[0]  +  dirs[i][1]*p[1]  +  dirs[i][2]*p[2];
            bounds[i].first = dirPos;
            bounds[i].second = dirPos;
        }
        intervalsUpToDate = true;
        minInterval = 0.0;
        maxInterval = 0.0;
    }

    void add( const point3d & p )
    {
        for( unsigned int i = 0 ; i < ndirs ; ++i )
        {
            double dirPos = dirs[i][0]*p[0]  +  dirs[i][1]*p[1]  +  dirs[i][2]*p[2];
            bounds[i].first = std::min< double >( dirPos , bounds[i].first );
            bounds[i].second = std::max< double >( dirPos , bounds[i].second );
        }
        intervalsUpToDate = false;
    }

    void add( const NDirectionalBS & bs )
    {
        for( unsigned int i = 0 ; i < ndirs ; ++i )
        {
            bounds[i].first = std::min< double >( bounds[i].first , bs.minValue(i) );
            bounds[i].second = std::max< double >( bounds[i].second , bs.maxValue(i) );
        }
        intervalsUpToDate = false;
    }

    double minValue( unsigned int i ) const {
        return bounds[i].first;
    }
    double maxValue( unsigned int i ) const {
        return bounds[i].second;
    }

    double getMinInterval()
    {
        if( !intervalsUpToDate )
            updateIntervals();

        return minInterval;
    }
    double getMaxInterval()
    {
        if( !intervalsUpToDate )
            updateIntervals();

        return maxInterval;
    }

    inline
    double radius()
    {
        return getMinInterval() * 0.75;
        //        return getMinInterval() * 0.55;
        //        return getMinInterval() * 0.66;
        //        return getMinInterval() * 0.55;
        //        return getMinInterval() * 1.0;
    }
};
}

template< typename T >
class BBOX
{
public:
    point3<T> bb,BB;

    BBOX() { clear(); }

    void clear()
    {
        bb[0] = FLT_MAX;
        BB[0] = -FLT_MAX;
    }
    bool isCleared() const { return bb[0] <= BB[0]; }

    template< class point_t >
    void set( const point_t & p )
    {
        bb = point3<T>(p[0],p[1],p[2]);
        BB = point3<T>(p[0],p[1],p[2]);
    }

    template< class point_t >
    void set( const point_t & pbb, const point_t & pBB )
    {
        bb = point3<T>(pbb[0],pbb[1],pbb[2]);
        BB = point3<T>(pBB[0],pBB[1],pBB[2]);
    }

    template< class point_t >
    void add( const point_t & p )
    {
        bb = point3<T>::min( bb,p );
        BB = point3<T>::max( BB,p );
    }

    void add( const BBOX<T> & b )
    {
        bb = point3<T>::min( bb,b.bb );
        BB = point3<T>::max( BB,b.BB );
    }

    T squareDiagonal() const
    {
        return (BB - bb).sqrnorm();
    }
    inline
    T diagonal() const
    {
        return sqrt( (BB - bb).sqrnorm() );
    }
    inline
    T radius() const
    {
        return diagonal() / 2.0;
    }
    inline
    T squareRadius() const
    {
        return squareDiagonal() / 4.0;
    }

    inline
    char getLargestExtent() const
    {
        if(  BB[0] - bb[0]  >  BB[1] - bb[1]  )
        {
            if( BB[0] - bb[0] > BB[2] - bb[2] )
                return 0;
            return 2;
        }
        else
        {
            if( BB[1] - bb[1] > BB[2] - bb[2] )
                return 1;
            return 2;
        }
    }
    inline
    T getExtentValue(char i) const
    {
        return BB[i] - bb[i];
    }
    inline
    T getLargestExtentValue() const
    {
        return getExtentValue( getLargestExtent() );
    }

    template< class point_t >
    inline
    T getPseudoExtentInDirection( point_t const & dir ) const {
        return getExtentValue(0) * fabs(dir[0])
                +getExtentValue(1) * fabs(dir[1])
                +getExtentValue(2) * fabs(dir[2]);
    }

    inline
    void splitAlongAxis( char axis , T value , BBOX<T> & bbox1 , BBOX<T> & bbox2 )
    {
        // for safety:
        value = std::max<T>( std::min<T>( value , BB[axis] ) , bb[axis] );
        point3<T> BB1 = BB;
        BB1[axis] = value;
        point3<T> bb2 = bb;
        bb2[axis] = value;
        bbox1.set( bb , BB1 );
        bbox2.set( bb2 , BB );
    }
};

typedef BBOX< float >    BBOXf;
typedef BBOX< double >   BBOXd;

template< typename T >
class mat33
{
public:
    typedef T                       type_t;

    ////////////         CONSTRUCTORS          //////////////
    mat33<T>()
    {
        vals[0] = 0;
        vals[1] = 0;
        vals[2] = 0;
        vals[3] = 0;
        vals[4] = 0;
        vals[5] = 0;
        vals[6] = 0;
        vals[7] = 0;
        vals[8] = 0;
    }
    mat33<T>( T v1 , T v2 , T v3 , T v4 , T v5 , T v6 , T v7 , T v8 , T v9)
    {
        vals[0] = v1;
        vals[1] = v2;
        vals[2] = v3;
        vals[3] = v4;
        vals[4] = v5;
        vals[5] = v6;
        vals[6] = v7;
        vals[7] = v8;
        vals[8] = v9;
    }
    template< typename T2 > mat33<T>( const std::vector< T2 > & cc )
    {
        for(int i = 0 ; i < 9 ; ++i )
            vals[i]=cc[i];
    }
    template< typename T2 > mat33<T>( const mat33< T2 > & m )
    {
        for(int i = 0 ; i < 9 ; ++i )
            vals[i] = (T)(m(i));
    }

    bool isnan() const {
        return std::isnan(vals[0]) || std::isnan(vals[1]) || std::isnan(vals[2])
                 || std::isnan(vals[3]) || std::isnan(vals[4]) || std::isnan(vals[5])
                 || std::isnan(vals[6]) || std::isnan(vals[7]) || std::isnan(vals[8]);
    }

    /////////////         SET         ///////////////
    inline
    void setIdentity()
    {
        vals[0] = 1;
        vals[1] = 0;
        vals[2] = 0;
        vals[3] = 0;
        vals[4] = 1;
        vals[5] = 0;
        vals[6] = 0;
        vals[7] = 0;
        vals[8] = 1;
    }
    inline
    void setZero()
    {
        vals[0] = 0;
        vals[1] = 0;
        vals[2] = 0;
        vals[3] = 0;
        vals[4] = 0;
        vals[5] = 0;
        vals[6] = 0;
        vals[7] = 0;
        vals[8] = 0;
    }

    template< typename T2 >
    void operator = (const mat33<T2> & m)
    {
        for( unsigned int c = 0 ; c < 9 ; ++c )
            vals[c] = (T)(m(c));
    }

    template< typename T2 >
    inline void set( const mat33<T2> & other )
    {
        for(unsigned int i = 0 ; i < 9; ++i)
            vals[ i ] = (T)(other(i));
    }

    void operator += (const mat33<T> & m)
    {
        for( unsigned int c = 0 ; c < 9 ; ++c )
            vals[c] += m(c);
    }
    void operator -= (const mat33<T> & m)
    {
        for( unsigned int c = 0 ; c < 9 ; ++c )
            vals[c] -= m(c);
    }
    void operator /= (double s)
    {
        for( unsigned int c = 0 ; c < 9 ; ++c )
            vals[c] /= s;
    }

    ////////        ACCESS TO COORDINATES      /////////
    T operator () (unsigned int i , unsigned int j) const
    { return vals[3*i + j]; }
    T & operator () (unsigned int i , unsigned int j)
    { return vals[3*i + j]; }
    T operator () (unsigned int v) const
    { return vals[v]; }
    T & operator () (unsigned int v)
    { return vals[v]; }

    T & getCoord(unsigned int i , unsigned int j)
    { return vals[3*i+j]; }
    T getCoord(unsigned int i , unsigned int j) const
    { return vals[3*i+j]; }
    T & getCoord(unsigned int i)
    { return vals[i]; }
    T getCoord(unsigned int i) const
    { return vals[i]; }

    ////////        ACCESS TO ROWS / COLUMNS      /////////
    point3<T> getRow( unsigned int i ) const
    {
        return point3<T>( vals[3*i] , vals[3*i+1] , vals[3*i+2] );
    }
    void setRow( unsigned int i , const point3<T> & p)
    {
        vals[3*i]   = p[0];
        vals[3*i+1] = p[1];
        vals[3*i+2] = p[2];
    }
    void setRows( const point3<T> & r1 , const point3<T> & r2 , const point3<T> & r3 )
    {
        vals[3*0]   = r1[0];
        vals[3*0+1] = r1[1];
        vals[3*0+2] = r1[2];
        vals[3*1]   = r2[0];
        vals[3*1+1] = r2[1];
        vals[3*1+2] = r2[2];
        vals[3*2]   = r3[0];
        vals[3*2+1] = r3[1];
        vals[3*2+2] = r3[2];
    }
    point3<T> getCol(unsigned int j) const
    {
        return point3<T>( vals[j] , vals[3+j] , vals[6+j] );
    }
    void setCol(unsigned int j , const point3<T> & p)
    {
        vals[j]   = p[0];
        vals[3+j] = p[1];
        vals[6+j] = p[2];
    }
    void setCols(const point3<T> & c1 , const point3<T> & c2 , const point3<T> & c3)
    {
        vals[0]   = c1[0];
        vals[3+0] = c1[1];
        vals[6+0] = c1[2];
        vals[1]   = c2[0];
        vals[3+1] = c2[1];
        vals[6+1] = c2[2];
        vals[2]   = c3[0];
        vals[3+2] = c3[1];
        vals[6+2] = c3[2];
    }

    ////////        BASICS       /////////
    inline T sqrnorm()
    {
        return vals[0]*vals[0] + vals[1]*vals[1] + vals[2]*vals[2]
                + vals[3]*vals[3] + vals[4]*vals[4] + vals[5]*vals[5]
                + vals[6]*vals[6] +  vals[7]*vals[7] + vals[8]*vals[8];
    }

    inline T norm()
    { return sqrt( sqrnorm() ); }

    inline T determinant() const
    {
        return vals[0] * ( vals[4] * vals[8] - vals[7] * vals[5] )
                - vals[1] * ( vals[3] * vals[8] - vals[6] * vals[5] )
                + vals[2] * ( vals[3] * vals[7] - vals[6] * vals[4] );
    }
    template< class point_t >
    inline T determinant_with_col0( point_t const & c ) const
    {
        return c[0] * ( vals[4] * vals[8] - vals[7] * vals[5] )
                - vals[1] * ( c[1] * vals[8] - c[2] * vals[5] )
                + vals[2] * ( c[1] * vals[7] - c[2] * vals[4] );
    }
    template< class point_t >
    inline T determinant_with_col1( point_t const & c ) const
    {
        return vals[0] * ( c[1] * vals[8] - c[2] * vals[5] )
                - c[0] * ( vals[3] * vals[8] - vals[6] * vals[5] )
                + vals[2] * ( vals[3] * c[2] - vals[6] * c[1] );
    }
    template< class point_t >
    inline T determinant_with_col2( point_t const & c ) const
    {
        return vals[0] * ( vals[4] * c[2] - vals[7] * c[1] )
                - vals[1] * ( vals[3] * c[2] - vals[6] * c[1] )
                + c[0] * ( vals[3] * vals[7] - vals[6] * vals[4] );
    }

    void RSD( mat33<T> & R , mat33<T> & S ) const {
        mat33<T> U , Vt; T x,y,z;
        SVD(U,x,y,z,Vt);
        R = U * Vt;
        S = Vt.getTranspose() * mat33<T>::Diag(x,y,z)*Vt;
    }

    static
    mat33<T> pseudoInverse( mat33<T> const & m , bool & isRealInverse , double defaultValueForInverseSingularValue = 0.0 )
    {
        T det = m.determinant();
        if( fabs(det) != 0.0 )
        {
            isRealInverse = true;
            return mat33<T>( m(1,1)*m(2,2) - m(2,1)*m(1,2) , m(0,2)*m(2,1) - m(0,1)*m(2,2) , m(0,1)*m(1,2) - m(0,2)*m(1,1) ,
                             m(1,2)*m(2,0) - m(1,0)*m(2,2) , m(0,0)*m(2,2) - m(0,2)*m(2,0) , m(0,2)*m(1,0) - m(0,0)*m(1,2) ,
                             m(1,0)*m(2,1) - m(1,1)*m(2,0) , m(0,1)*m(2,0) - m(0,0)*m(2,1) , m(0,0)*m(1,1) - m(0,1)*m(1,0) ) / det ;
        }

        // otherwise:
        isRealInverse = false;
        mat33<T> U ; T sx ; T sy ; T sz ; mat33<T> Vt;
        m.SVD(U,sx,sy,sz,Vt);
        T sxInv = sx == 0.0 ? 1.0 / sx : defaultValueForInverseSingularValue;
        T syInv = sy == 0.0 ? 1.0 / sy : defaultValueForInverseSingularValue;
        T szInv = sz == 0.0 ? 1.0 / sz : defaultValueForInverseSingularValue;
        return Vt.getTranspose() * mat33<T>::diag(sxInv , syInv , szInv) * U.getTranspose();
    }

//    template< class point_t >
//    point_t solveLinearSystem(point_t const & rhs , bool & isPseudoInverse) const {
//        double det = determinant();
//        double epsilonPrecision = 0.000001;
//        if(  fabs(det) < epsilonPrecision  ) {
//            isPseudoInverse = true;
//            mat33<T> U , Vt; double x,y,z;
//            SVD(U,x,y,z,Vt);
//            double xInv = fabs(x) < epsilonPrecision ? 0.0 : 1.0/x;
//            double yInv = fabs(y) < epsilonPrecision ? 0.0 : 1.0/y;
//            double zInv = fabs(z) < epsilonPrecision ? 0.0 : 1.0/z;
//            return Vt.getTranspose() * mat33<T>::diag(xInv,yInv,zInv) * U.getTranspose() * rhs;
//        }
//        isPseudoInverse = false;
//        return point_t(
//                    determinant_with_col0(rhs) / det,
//                    determinant_with_col1(rhs) / det,
//                    determinant_with_col2(rhs) / det
//                    );
//    }

    inline T trace() const
    { return vals[0] + vals[4] + vals[8]; }

    ////////        TRANSPOSE       /////////
    inline
    void transpose()
    {
        T xy = vals[1] , xz = vals[2] , yz = vals[5];
        vals[1] = vals[3];
        vals[3] = xy;
        vals[2] = vals[6];
        vals[6] = xz;
        vals[5] = vals[7];
        vals[7] = yz;
    }
    mat33<T> getTranspose() const
    {
        return mat33<T>(vals[0],vals[3],vals[6],vals[1],vals[4],vals[7],vals[2],vals[5],vals[8]);
    }

    ////////        HARMONICITY (not needed usually)       /////////
    void coutHessianHarmonicity()
    {
        std::cout << "xx + yy + zz = " << (getCoord(0,0) + getCoord(1,1) + getCoord(2,2)) << std::endl <<
                     "xy - yx : " << getCoord(0,1) - getCoord(1,0) << std::endl <<
                     "yz - zy : " << getCoord(1,2) - getCoord(2,1) << std::endl <<
                     "xz - zx : " << getCoord(0,2) - getCoord(2,0) << std::endl;
    }
    void enforceHessianHarmonicity()
    {
        vals[8] = -vals[0] - vals[4];
        vals[3] = vals[1];
        vals[5] = vals[7];
        vals[2] = vals[6];
    }
    inline
    T harmonicityError()
    {
        return std::abs( vals[8] + vals[0] + vals[4] ) + std::abs( vals[3] - vals[1] ) + std::abs( vals[5] - vals[7] ) + std::abs( vals[2] - vals[6] );
    }

    ////////        VECTOR PRODUCTS       /////////
    void setVectorProduct( const point3<T> & v1 , const point3<T> & v2 )
    {
        for( int i = 0 ; i < 3 ; ++i )
            for( int j = 0 ; j < 3 ; ++j )
                vals[ 3*i+j ] = v1[i]*v2[j];
    }

    void addVectorProduct( const point3<T> & v1 , const point3<T> & v2 )
    {
        for( int i = 0 ; i < 3 ; ++i )
            for( int j = 0 ; j < 3 ; ++j )
                vals[ 3*i+j ] += v1[i]*v2[j];
    }

    ////////////         ROTATION <-> AXIS/ANGLE         /////////////
    void getAxisAndAngleFromRotationMatrix( point3<T> & axis , T & angle ) const
    {
        angle = acos( (trace() - 1) / 2 );
        axis[0] = vals[7] - vals[5];
        axis[1] = vals[2] - vals[6];
        axis[2] = vals[3] - vals[1];
        axis.normalize();
    }

    inline static
    mat33<T> getRotationMatrixFromAxisAndAngle( const point3<T> & axis , T angle )
    {
        mat33<T> w = vectorial(axis);
        return Identity() + std::sin(angle) * w + ((T)(1.0) - std::cos(angle)) * w * w;
    }

    inline static
    mat33<T> getRotationMatrixMappingUnitsVec1ToVec2( const point3<T> & vec1 , const point3<T> & vec2 )
    {
        point3<T> axis = point3<T>::cross( vec1,vec2 );
        T nn = axis.norm();
        if( nn <= 0.0000001 )
            return mat33<T>::Identity();
        T angle = std::asin( nn );
        axis /= nn;
        return getRotationMatrixFromAxisAndAngle(axis,angle);
    }

    ////////////////////            STATIC STANDARD MATRICES          ////////////////////////////
    inline static mat33<T> Identity()
    {  return mat33<T>(1,0,0  ,  0,1,0  ,  0,0,1);  }

    inline static mat33<T> Zero()
    {  return mat33<T>(0,0,0  ,  0,0,0  ,  0,0,0);  }

    template< typename T2 >
    inline static mat33<T> diag( T2 x , T2 y ,T2 z )
    {  return mat33<T>(x,0,0  ,  0,y,0  ,  0,0,z);  }

    inline static mat33<T> Rand()
    {
        return mat33<T>( -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ),
                         -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX ));
    }

    template< class point_t >
    inline static mat33<T> getFromCols(const point_t & c1 , const point_t & c2 , const point_t & c3)
    {
        // 0 1 2
        // 3 4 5
        // 6 7 8
        return mat33<T>( c1[0] , c2[0] , c3[0] ,
                         c1[1] , c2[1] , c3[1] ,
                         c1[2] , c2[2] , c3[2] );
    }
    template< class point_t >
    inline static mat33<T> getFromRows(const point_t & r1 , const point_t & r2 , const point_t & r3)
    {
        // 0 1 2
        // 3 4 5
        // 6 7 8
        return mat33<T>( r1[0] , r1[1] , r1[2] ,
                         r2[0] , r2[1] , r2[2] ,
                         r3[0] , r3[1] , r3[2] );
    }

    inline static mat33<T> Rand( double min_value , double max_value )
    {
        return mat33<T>( min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ),
                         min_value + (max_value - min_value) * ( (float)(rand()) / (float)( RAND_MAX ) ));
    }
    inline static mat33<T> Rand( double randMagnitude )
    {
        T mabs = fabs(randMagnitude);
        return mat33<T>::Rand(-mabs,mabs);
    }

    inline static mat33<T> RandRotation()
    {
        point3<T> axis(-1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX )  ,
                       -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX )  ,
                       -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX )  );
        axis.normalize();
        T angle = 2.0 * M_PI * ((float)(rand()) / (float)( RAND_MAX )   - 0.5 );

        return mat33<T>::getRotationMatrixFromAxisAndAngle( axis , angle );
    }

    inline static mat33<T> RandRotation( T maxAngle )
    {
        point3<T> axis(-1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX )  ,
                       -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX )  ,
                       -1.0 + 2.0* (float)(rand()) / (float)( RAND_MAX )  );
        axis.normalize();
        T angle =  maxAngle * ((float)(rand()) / (float)( RAND_MAX )   - 0.5 );

        return mat33<T>::getRotationMatrixFromAxisAndAngle( axis , angle );
    }

    inline static mat33<T> createRandomRotation( point3<T> twistAxis , double maxTwist , double maxRotation )
    {
        twistAxis.normalize();
        point3<T> u = twistAxis.getOrthogonal();
        u.normalize();
        const point3<T> & v = point3<T>::cross(u,twistAxis);

        double uv_axis_angle = 2.0*M_PI * (double)(rand()) / (double)(RAND_MAX);
        const point3<T> & uv = cos(uv_axis_angle)*u + sin(uv_axis_angle)*v;

        double rotation_angle = maxRotation * ( ( 2.0 *(double)(rand()) / (double)(RAND_MAX) ) - 1.0 );
        double twist_angle = maxTwist * ( ( 2.0 *(double)(rand()) / (double)(RAND_MAX) ) - 1.0 );

        return mat33<T>::getRotationMatrixFromAxisAndAngle(uv , rotation_angle) * mat33<T>::getRotationMatrixFromAxisAndAngle(twistAxis , twist_angle);
    }

    // method defined as a standard Linear System Jacobian initialization (either Identity() or RandRotation())
    inline static
    mat33<T> LSJacobianInit()
    { return mat33<T>::Identity(); }

    void SVD( mat33<T> & U , T & sx , T & sy , T & sz , mat33<T> & Vt ) const
    {
#ifdef __USE_GSL_FOR_MAT33
        gsl_matrix * u = gsl_matrix_alloc(3,3);
        for(unsigned int i = 0 ; i < 3; ++i)
            for(unsigned int j = 0 ; j < 3; ++j)
                gsl_matrix_set( u , i , j , this->getCoord(i,j) );

        gsl_matrix * v = gsl_matrix_alloc(3,3);
        gsl_vector * s = gsl_vector_alloc(3);
        gsl_vector * work = gsl_vector_alloc(3);

        gsl_linalg_SV_decomp (u,
                              v,
                              s,
                              work);

        sx = s->data[0];
        sy = s->data[1];
        sz = s->data[2];
        for(unsigned int i = 0 ; i < 3; ++i)
        {
            for(unsigned int j = 0 ; j < 3; ++j)
            {
                U(i,j) = gsl_matrix_get( u , i , j );
                Vt(i,j) = gsl_matrix_get( v , j , i );
            }
        }

        gsl_matrix_free(u);
        gsl_matrix_free(v);
        gsl_vector_free(s);
        gsl_vector_free(work);
#else
        assert( 0   &&   "You need to use a Linear Algebra Library in order to use mat33<T>::SVD !" );
#endif

        // a transformation T is given as R.B.S.Bt, R = rotation , B = local basis (rotation matrix), S = scales in the basis B
        // it can be obtained from the svd decomposition of T = U Sigma Vt :
        // B = V
        // S = Sigma
        // R = U.Vt
    }

    ///////////////////      Projections onto Rotations :     ////////////////////
    mat33<T> getRotationalPart() const
    {
        mat33<T> U,Vt;
        T sx,sy,sz;
        SVD(U,sx,sy,sz,Vt);
        const mat33<T> & res = U*Vt;
        if( res.determinant() < 0 )
        {
            U(2) = -U(2);
            U(5) = -U(5);
            U(8) = -U(8);
            return U*Vt;
        }
        // else
        return res;
    }

    void setRotation()
    {
        mat33<T> U,Vt;
        T sx,sy,sz;
        SVD(U,sx,sy,sz,Vt);
        const mat33<T> & res = U*Vt;
        if( res.determinant() < 0 )
        {
            U(2) = -U(2);
            U(5) = -U(5);
            U(8) = -U(8);
            set(U*Vt);
            return;
        }
        // else
        set(res);
    }

    void setRotation( double weight )
    {
        mat33<T> U,Vt;
        T sx,sy,sz;
        SVD(U,sx,sy,sz,Vt);
        mat33<T> S( weight + (1-weight)*sx ,0,0,0,weight + (1-weight)*sy ,0,0,0, weight + (1-weight)*sz );
        const mat33<T> & res = U*S*Vt;
        if( res.determinant() < 0 )
        {
            S(8) = -S(8);
            set(U*S*Vt);
            return;
        }
        // else
        set(res);
    }

    void setSimilarity()
    {
        mat33<T> U,Vt;
        T sx,sy,sz;
        SVD(U,sx,sy,sz,Vt);
        mat33<T> S((sx+sy+sz)/3,0,0,0,(sx+sy+sz)/3,0,0,0,(sx+sy+sz)/3);
        const mat33<T> & res = U*S*Vt;
        if( res.determinant() < 0 )
        {
            S(8) = -S(8);
            set(U* S * Vt);
            return;
        }
        // else
        set(res);
    }

    // TO CHECK WHAT'S BEST
    // what is the L2 projection on the set of matrices of the form R . B2 . diag[1 1 x] . B2^T ?
    // is U . V^T . B2 . diag[1 1 x] . B2^T enough ?
    void setRotationOnTangentPlane( const mat33<T> & B2 )
    {   // B2 is assumed to be an orthogonal matrix with B2(2) = normal of the tangent plane
        // SVD :
        mat33<T> U,Vt;
        T sx,sy,sz;
        SVD(U,sx,sy,sz,Vt);

        if( (U*Vt).determinant() < 0 ){ U(2) = -U(2); U(5) = -U(5); U(8) = -U(8); }

        const point3<T> & VtB2_col2 = ( Vt * B2 ).getCol(2);
        T lambda = sx * VtB2_col2[0] * VtB2_col2[0]  +  sy * VtB2_col2[1] * VtB2_col2[1]  +  sz * VtB2_col2[2] * VtB2_col2[2];

        // if( (U*Vt).determinant() < 0 ){ lambda = -lambda; }

        mat33<T> NewScales = mat33<T>::Identity();
        NewScales(2,2) = lambda;

        set( U * Vt * B2 * transposeProduct01( NewScales , B2 ) );
    }

    void setRotationOnTangentPlane( const point3<T> & p_normal )
    {   // p_normal is assumed to be normalized
        // construction of B2 : 3x3 matrix that represents an orthogonal basis where B2(2) = p_normal
        point3<T> b1 = p_normal.getOrthogonal();
        b1.normalize();
        const point3<T> & b2 = point3<T>::cross( p_normal , b1 );

        mat33<T> B2;
        B2.setCol( 0 , b1 );
        B2.setCol( 1 , b2 );
        B2.setCol( 2 , p_normal );

        setRotationOnTangentPlane(B2);
    }

    //////////           Stupid products          /////////////
    // get the result of m1^T * m2:
    static
    mat33<T> transposeProduct10( const mat33<T> & m1 , const mat33<T> & m2 )
    {
        return mat33<T>(
                    m1(0)*m2(0) + m1(3)*m2(3) + m1(6)*m2(6) ,
                    m1(0)*m2(1) + m1(3)*m2(4) + m1(6)*m2(7) ,
                    m1(0)*m2(2) + m1(3)*m2(5) + m1(6)*m2(8) ,
                    m1(1)*m2(0) + m1(4)*m2(3) + m1(7)*m2(6) ,
                    m1(1)*m2(1) + m1(4)*m2(4) + m1(7)*m2(7) ,
                    m1(1)*m2(2) + m1(4)*m2(5) + m1(7)*m2(8) ,
                    m1(2)*m2(0) + m1(5)*m2(3) + m1(8)*m2(6) ,
                    m1(2)*m2(1) + m1(5)*m2(4) + m1(8)*m2(7) ,
                    m1(2)*m2(2) + m1(5)*m2(5) + m1(8)*m2(8)
                    );
    }
    // get the result of m1 * m2^T:
    static
    mat33<T> transposeProduct01( const mat33<T> & m1 , const mat33<T> & m2 )
    {
        return mat33<T>(
                    m1(0)*m2(0) + m1(1)*m2(1) + m1(2)*m2(2) ,
                    m1(0)*m2(3) + m1(1)*m2(4) + m1(2)*m2(5) ,
                    m1(0)*m2(6) + m1(1)*m2(7) + m1(2)*m2(8) ,
                    m1(3)*m2(0) + m1(4)*m2(1) + m1(5)*m2(2) ,
                    m1(3)*m2(3) + m1(4)*m2(4) + m1(5)*m2(5) ,
                    m1(3)*m2(6) + m1(4)*m2(7) + m1(5)*m2(8) ,
                    m1(6)*m2(0) + m1(7)*m2(1) + m1(8)*m2(2) ,
                    m1(6)*m2(3) + m1(7)*m2(4) + m1(8)*m2(5) ,
                    m1(6)*m2(6) + m1(7)*m2(7) + m1(8)*m2(8)
                    );
    }

    // get the result of m^T * m:
    mat33<T> selfTransposeProduct10(  ) const
    {
        return mat33<T>(
                    vals[0]*vals[0] + vals[3]*vals[3] + vals[6]*vals[6] ,
                    vals[0]*vals[1] + vals[3]*vals[4] + vals[6]*vals[7] ,
                    vals[0]*vals[2] + vals[3]*vals[5] + vals[6]*vals[8] ,
                    vals[1]*vals[0] + vals[4]*vals[3] + vals[7]*vals[6] ,
                    vals[1]*vals[1] + vals[4]*vals[4] + vals[7]*vals[7] ,
                    vals[1]*vals[2] + vals[4]*vals[5] + vals[7]*vals[8] ,
                    vals[2]*vals[0] + vals[5]*vals[3] + vals[8]*vals[6] ,
                    vals[2]*vals[1] + vals[5]*vals[4] + vals[8]*vals[7] ,
                    vals[2]*vals[2] + vals[5]*vals[5] + vals[8]*vals[8]
                    );
    }
    // get the result of m * m^T:
    mat33<T> selfTransposeProduct01(  ) const
    {
        return mat33<T>(
                    vals[0]*vals[0] + vals[1]*vals[1] + vals[2]*vals[2] ,
                    vals[0]*vals[3] + vals[1]*vals[4] + vals[2]*vals[5] ,
                    vals[0]*vals[6] + vals[1]*vals[7] + vals[2]*vals[8] ,
                    vals[3]*vals[0] + vals[4]*vals[1] + vals[5]*vals[2] ,
                    vals[3]*vals[3] + vals[4]*vals[4] + vals[5]*vals[5] ,
                    vals[3]*vals[6] + vals[4]*vals[7] + vals[5]*vals[8] ,
                    vals[6]*vals[0] + vals[7]*vals[1] + vals[8]*vals[2] ,
                    vals[6]*vals[3] + vals[7]*vals[4] + vals[8]*vals[5] ,
                    vals[6]*vals[6] + vals[7]*vals[7] + vals[8]*vals[8]
                    );
    }

    template< class point_t >
    inline static
    mat33<T> tensor( const point_t & p1 , const point_t & p2 )
    {
        return mat33<T>(
                    p1.x()*p2.x() , p1.x()*p2.y() , p1.x()*p2.z(),
                    p1.y()*p2.x() , p1.y()*p2.y() , p1.y()*p2.z(),
                    p1.z()*p2.x() , p1.z()*p2.y() , p1.z()*p2.z());
    }

    template< class point_t >
    inline static
    mat33<T> vectorial( const point_t & p )
    {
        return mat33<T>(
                    0       , -p.z()    , p.y()     ,
                    p.z()   , 0         , - p.x()   ,
                    - p.y() , p.x()     , 0
                    );
    }

    mat33<T> logOfRotation() const {
        point3<T> axis; double angle;
        this->getAxisAndAngleFromRotationMatrix(axis,angle);
        return angle * vectorial( axis );
    }

    mat33<T> logToRotation() const {
        point3<T> axis( - (this->operator()(1,2)) , (this->operator()(0,2)) , - (this->operator()(0,1)) ); double angle = axis.norm(); axis.normalize();
        return getRotationMatrixFromAxisAndAngle(axis , angle);
    }

    mat33<T> operator - () const
    {
        return mat33<T>( - vals[0],- vals[1],- vals[2],- vals[3],- vals[4],- vals[5],- vals[6],- vals[7],- vals[8] );
    }

private:
    T vals[9];
    // will be noted as :
    // 0 1 2
    // 3 4 5
    // 6 7 8
};

typedef mat33< float >  mat33f;
typedef mat33< double > mat33d;

template< typename T >
mat33<T> operator + (const mat33<T> & m1 , const mat33<T> & m2)
{
    return mat33<T>( m1(0)+m2(0) , m1(1)+m2(1) , m1(2)+m2(2) , m1(3)+m2(3) , m1(4)+m2(4) , m1(5)+m2(5) , m1(6)+m2(6) , m1(7)+m2(7) , m1(8)+m2(8) );
}
template< typename T >
mat33<T> operator - (const mat33<T> & m1 , const mat33<T> & m2)
{
    return mat33<T>( m1(0)-m2(0) , m1(1)-m2(1) , m1(2)-m2(2) , m1(3)-m2(3) , m1(4)-m2(4) , m1(5)-m2(5) , m1(6)-m2(6) , m1(7)-m2(7) , m1(8)-m2(8) );
}

template< typename T >
mat33<T> operator * (int s , const mat33<T> & m)
{
    return mat33<T>( m(0)*s , m(1)*s , m(2)*s , m(3)*s , m(4)*s , m(5)*s , m(6)*s , m(7)*s , m(8)*s );
}
template< typename T >
mat33<T> operator * (float s , const mat33<T> & m)
{
    return mat33<T>( m(0)*s , m(1)*s , m(2)*s , m(3)*s , m(4)*s , m(5)*s , m(6)*s , m(7)*s , m(8)*s );
}
template< typename T >
mat33<T> operator * (double s , const mat33<T> & m)
{
    return mat33<T>( m(0)*s , m(1)*s , m(2)*s , m(3)*s , m(4)*s , m(5)*s , m(6)*s , m(7)*s , m(8)*s );
}

template< typename T >
mat33<T> operator * (const mat33<T> & m , int s)
{
    return mat33<T>( m(0)*s , m(1)*s , m(2)*s , m(3)*s , m(4)*s , m(5)*s , m(6)*s , m(7)*s , m(8)*s );
}
template< typename T >
mat33<T> operator * (const mat33<T> & m , float s)
{
    return mat33<T>( m(0)*s , m(1)*s , m(2)*s , m(3)*s , m(4)*s , m(5)*s , m(6)*s , m(7)*s , m(8)*s );
}
template< typename T >
mat33<T> operator * (const mat33<T> & m , double s)
{
    return mat33<T>( m(0)*s , m(1)*s , m(2)*s , m(3)*s , m(4)*s , m(5)*s , m(6)*s , m(7)*s , m(8)*s );
}

template< typename T >
mat33<T> operator / (const mat33<T> & m , int s)
{
    return mat33<T>( m(0)/s , m(1)/s , m(2)/s , m(3)/s , m(4)/s , m(5)/s , m(6)/s , m(7)/s , m(8)/s );
}
template< typename T >
mat33<T> operator / (const mat33<T> & m , float s)
{
    return mat33<T>( m(0)/s , m(1)/s , m(2)/s , m(3)/s , m(4)/s , m(5)/s , m(6)/s , m(7)/s , m(8)/s );
}
template< typename T >
mat33<T> operator / (const mat33<T> & m , double s)
{
    return mat33<T>( m(0)/s , m(1)/s , m(2)/s , m(3)/s , m(4)/s , m(5)/s , m(6)/s , m(7)/s , m(8)/s );
}

template< typename T >
point3<T> operator * (const mat33<T> & m , const point3<T> & p) // computes m.p
{
    return point3<T>(
                m(0)*p[0] + m(1)*p[1] + m(2)*p[2],
                m(3)*p[0] + m(4)*p[1] + m(5)*p[2],
                m(6)*p[0] + m(7)*p[1] + m(8)*p[2]);
}
template< typename T >
point3<T> operator * (const point3<T> & p , const mat33<T> & m) // computes p^t . m = (m^t . p)^t
{
    return point3<T>(
                m(0)*p[0] + m(3)*p[1] + m(6)*p[2],
                m(1)*p[0] + m(4)*p[1] + m(7)*p[2],
                m(2)*p[0] + m(5)*p[1] + m(8)*p[2]);
}

template< typename T >
mat33<T> operator * (const mat33<T> & m1 , const mat33<T> & m2)
{
    return mat33<T>(
                m1(0)*m2(0) + m1(1)*m2(3) + m1(2)*m2(6) ,
                m1(0)*m2(1) + m1(1)*m2(4) + m1(2)*m2(7) ,
                m1(0)*m2(2) + m1(1)*m2(5) + m1(2)*m2(8) ,
                m1(3)*m2(0) + m1(4)*m2(3) + m1(5)*m2(6) ,
                m1(3)*m2(1) + m1(4)*m2(4) + m1(5)*m2(7) ,
                m1(3)*m2(2) + m1(4)*m2(5) + m1(5)*m2(8) ,
                m1(6)*m2(0) + m1(7)*m2(3) + m1(8)*m2(6) ,
                m1(6)*m2(1) + m1(7)*m2(4) + m1(8)*m2(7) ,
                m1(6)*m2(2) + m1(7)*m2(5) + m1(8)*m2(8)
                );
}

template< typename T > inline std::ostream & operator << (std::ostream & s , mat33< T > const & m)
{
    s << m(0) << " \t" << m(1) << " \t" << m(2) << std::endl << m(3) << " \t" << m(4) << " \t" << m(5) << std::endl << m(6) << " \t" << m(7) << " \t" << m(8) << std::endl;
    return s;
}

#ifdef __USE_GSL_FOR_MAT33

template< typename T >
class mat33staticsvd : public mat33< T >
{
private:
    gsl_matrix * u;
    gsl_matrix * v;
    gsl_vector * s;
    gsl_vector * work;

    bool svd_allocated;

    void allocate_svd()
    {
        if(svd_allocated) return;
        u = gsl_matrix_alloc(3,3);
        v = gsl_matrix_alloc(3,3);
        s = gsl_vector_alloc(3);
        work = gsl_vector_alloc(3);
        svd_allocated = true;
    }
    void free_svd()
    {
        if(!svd_allocated) return;
        gsl_matrix_free(u);
        gsl_matrix_free(v);
        gsl_vector_free(s);
        gsl_vector_free(work);
        svd_allocated = false;
    }

public:
    mat33staticsvd<T>() :
        mat33< T >() ,
        svd_allocated(false)
    {
    }
    mat33staticsvd<T>( T v1 , T v2 , T v3 , T v4 , T v5 , T v6 , T v7 , T v8 , T v9) :
        mat33< T >( v1 , v2 , v3 , v4 , v5 , v6 , v7 , v8 , v9) ,
        svd_allocated(false)
    {
    }
    template< typename T2 > mat33staticsvd<T>( const std::vector< T2 > & cc ) :
        mat33< T >(cc) ,
        svd_allocated(false)
    {
    }
    template< typename T2 > mat33staticsvd<T>( const mat33< T2 > & m ) :
        mat33< T >(m) ,
        svd_allocated(false)
    {
    }
    ~mat33staticsvd<T>()
    {
        free_svd();
    }

    void SVD( mat33<T> & U , T & sx , T & sy , T & sz , mat33<T> & Vt ) const
    {
        allocate_svd();

        for(unsigned int i = 0 ; i < 3; ++i)
            for(unsigned int j = 0 ; j < 3; ++j)
                gsl_matrix_set( u , i , j , this->getCoord(i,j) );

        gsl_linalg_SV_decomp (u,
                              v,
                              s,
                              work);

        sx = s->data[0];
        sy = s->data[1];
        sz = s->data[2];
        for(unsigned int i = 0 ; i < 3; ++i)
        {
            for(unsigned int j = 0 ; j < 3; ++j)
            {
                U(i,j) = gsl_matrix_get( u , i , j );
                Vt(i,j) = gsl_matrix_get( v , j , i );
            }
        }
    }
};
#endif

#endif

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