Method getSceneDepth

source/visualization/OpenGL/src/G4OpenGLViewer.cc:1065–1078

GLdouble G4OpenGLViewer::getSceneDepth()
{
  if (!fSceneHandler.GetScene()) {
    return 0;
  }
  const G4Point3D targetPoint
    = fSceneHandler.GetScene()->GetStandardTargetPoint()
    + fVP.GetCurrentTargetPoint ();
  G4double radius = fSceneHandler.GetScene()->GetExtent().GetExtentRadius();
  if(radius<=0.) radius = 1.;
  const G4double cameraDistance = fVP.GetCameraDistance (radius);
  const GLdouble pnear   = fVP.GetNearDistance (cameraDistance, radius);
  return fVP.GetFarDistance  (cameraDistance, pnear, radius)- pnear;
}