CurvilinearUVT.icc

Go to the documentation of this file.

/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
namespace Trk {
 
inline CurvilinearUVT::CurvilinearUVT(const Amg::Vector3D& dir)
  : m_curvT(dir)
{
  // make it safe for tracks progressing along the z axis
  if (std::abs(dir.normalized().dot(Amg::Vector3D::UnitZ())) < 0.99) {
    Amg::Vector3D curvZcrossT = -(m_curvT.cross(Amg::Vector3D::UnitZ()));
    m_curvU = curvZcrossT.normalized();
    m_curvV = m_curvT.cross(m_curvU);
  } else {
    Amg::Vector3D curvZcrossT = -(m_curvT.cross(Amg::Vector3D::UnitX()));
    m_curvU = curvZcrossT.normalized();
    m_curvV = m_curvT.cross(m_curvU);
  }
}
 
inline const Amg::Vector3D&
CurvilinearUVT::curvU() const
{
  return (m_curvU);
}
 
inline const Amg::Vector3D&
CurvilinearUVT::curvV() const
{
  return (m_curvV);
}
 
inline const Amg::Vector3D&
CurvilinearUVT::curvT() const
{
  return (m_curvT);
}
 
}