text: //////////////////////////////////////////////////////////////////////////
  //
  //  Copyright (c) 2007-2011, Image Engine Design Inc. All rights reserved.
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions are
  //  met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //
  //     * Redistributions in binary form must reproduce the above copyright
  //       notice, this list of conditions and the following disclaimer in the
  //       documentation and/or other materials provided with the distribution.
  //
  //     * Neither the name of Image Engine Design nor the names of any
  //       other contributors to this software may be used to endorse or
  //       promote products derived from this software without specific prior
  //       written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  //  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  //  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  //  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  //  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  //  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  //  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  //  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  //  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  //  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  //////////////////////////////////////////////////////////////////////////
  
  //! \file MatrixAlgo.h
  /// Defines useful operations on Imath::Matrix types.
  /// \ingroup mathGroup
  
  #ifndef IE_CORE_MATRIXALGO_H
  #define IE_CORE_MATRIXALGO_H
  
  #include "IECore/Convert.h"
  #include "IECore/Export.h"
  
  IECORE_PUSH_DEFAULT_VISIBILITY
  #include "OpenEXR/ImathMatrix.h"
  IECORE_POP_DEFAULT_VISIBILITY
  
  namespace IECore
  {
  
  /// Returns a matrix specified by the orientation of the unit vectors x,y,z and origin o after transformation
  /// by the matrix.
  template<typename T>
  Imath::Matrix44<T> matrixFromBasis( const Imath::Vec3<T> &x, const Imath::Vec3<T> &y, const Imath::Vec3<T> &z, const Imath::Vec3<T> &o );
  
  template<class T>
  float determinant( const Imath::Matrix33<T> &m );
  
  template<class T>
  float determinant( const Imath::Matrix44<T> &m );
  
  // provide function for convertion between float to double matrix (not available in OpenEXR)
  template<> IECORE_API Imath::M44d convert( const Imath::M44f &in );
  // provide function for convertion between double to float matrix (not available in OpenEXR)
  template<> IECORE_API Imath::M44f convert( const Imath::M44d &in );
  
  } // namespace IECore
  
  #include "IECore/MatrixAlgo.inl"
  
  #endif // IE_CORE_MATRIXALGO_H
  