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#ifndef PCL_WARP_POINT_RIGID_6D_H_
#define PCL_WARP_POINT_RIGID_6D_H_

#include <pcl/registration/warp_point_rigid.h>

namespace pcl
{
  namespace registration
  {
    /** \brief @b WarpPointRigid3D enables 6D (3D rotation + 3D translation) 
      * transformations for points.
      * 
      * \note The class is templated on the source and target point types as well as on the output scalar of the transformation matrix (i.e., float or double). Default: float.
      * \author Radu B. Rusu
      * \ingroup registration
      */
    template <typename PointSourceT, typename PointTargetT, typename Scalar = float>
    class WarpPointRigid6D : public WarpPointRigid<PointSourceT, PointTargetT, Scalar>
    {
      public:
        using WarpPointRigid<PointSourceT, PointTargetT, Scalar>::transform_matrix_;

        typedef typename WarpPointRigid<PointSourceT, PointTargetT, Scalar>::Matrix4 Matrix4;
        typedef typename WarpPointRigid<PointSourceT, PointTargetT, Scalar>::VectorX VectorX;

        typedef boost::shared_ptr<WarpPointRigid6D<PointSourceT, PointTargetT, Scalar> > Ptr;
        typedef boost::shared_ptr<const WarpPointRigid6D<PointSourceT, PointTargetT, Scalar> > ConstPtr;

        WarpPointRigid6D () : WarpPointRigid<PointSourceT, PointTargetT, Scalar> (6) {}
      
        /** \brief Empty destructor */
        virtual ~WarpPointRigid6D () {}

        /** \brief Set warp parameters. 
          * \note Assumes the quaternion parameters are normalized. 
          * \param[in] p warp parameters (tx ty tz qx qy qz)
          */
        virtual void 
        setParam (const VectorX& p)
        {
          assert (p.rows () == this->getDimension ());

          // Copy the rotation and translation components
          transform_matrix_.setZero ();
          transform_matrix_ (0, 3) = p[0];
          transform_matrix_ (1, 3) = p[1];
          transform_matrix_ (2, 3) = p[2];
          transform_matrix_ (3, 3) = 1;
          
          // Compute w from the unit quaternion
          Eigen::Quaternion<Scalar> q (0, p[3], p[4], p[5]);
          q.w () = static_cast<Scalar> (sqrt (1 - q.dot (q)));
          q.normalize ();
          transform_matrix_.topLeftCorner (3, 3) = q.toRotationMatrix ();
        }
    };
  }
}

#endif

