//
// ********************************************************************
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//
// $Id: G4NormalNavigation.icc,v 1.5 2002/05/15 10:21:48 gcosmo Exp $
// GEANT4 tag $Name: geant4-05-00 $
//
// 
// G4NormalNavigation Inline Implementation
// ********************************************************************

// ********************************************************************
// LevelLocate
// ********************************************************************
//
inline
G4bool
G4NormalNavigation::LevelLocate( G4NavigationHistory& history,
                           const G4VPhysicalVolume* blockedVol,
                           const G4int,
                           const G4ThreeVector& globalPoint,
                           const G4ThreeVector* globalDirection,
                           const G4bool  pLocatedOnEdge, 
                                 G4ThreeVector &localPoint )
{
  G4VPhysicalVolume *targetPhysical, *samplePhysical;
  G4LogicalVolume *targetLogical;
  G4VSolid *sampleSolid;
  G4ThreeVector samplePoint;
  G4int targetNoDaughters;
  
  targetPhysical = history.GetTopVolume();
  targetLogical = targetPhysical->GetLogicalVolume();
  targetNoDaughters = targetLogical->GetNoDaughters();
  
  if (targetNoDaughters==0) return false;
  
  //
  // Search daughters in volume
  //

  for ( register int sampleNo=targetNoDaughters-1; sampleNo>=0; sampleNo-- )
  {
    samplePhysical = targetLogical->GetDaughter(sampleNo);
    if ( samplePhysical!=blockedVol )
    {
      // Setup volume with mother ptr
      //
      samplePhysical->Setup(targetPhysical);
      history.NewLevel(samplePhysical, kNormal, samplePhysical->GetCopyNo());
      sampleSolid = samplePhysical->GetLogicalVolume()->GetSolid();
      samplePoint = history.GetTopTransform().TransformPoint(globalPoint);
      if( G4AuxiliaryNavServices::
          CheckPointOnSurface(sampleSolid, samplePoint, globalDirection, 
                              history.GetTopTransform(), pLocatedOnEdge) )
      {
        // Enter this daughter
        //
        localPoint = samplePoint;
        return true;
      }
      else
      {
        history.BackLevel();
      }
    }
  }
  return false;
}