Method GetRegion

IO/IOSS/vtkIOSSReaderInternal.cxx:902–1048

}

Ioss::Region* vtkIOSSReaderInternal::GetRegion(
  const std::string& dbasename, int fileid, Ioss::DatabaseUsage dbUsage)
{
  assert(fileid >= 0);
  auto iter = this->DatabaseNames.find(dbasename);
  assert(iter != this->DatabaseNames.end());

  const bool has_multiple_files = (iter->second.ProcessCount > 0);
  assert(has_multiple_files == false || (fileid < static_cast<int>(iter->second.Ranks.size())));

  auto processor = has_multiple_files ? *std::next(iter->second.Ranks.begin(), fileid) : 0;

  auto riter = this->RegionMap.find(std::make_pair(dbasename, processor));
  if (riter == this->RegionMap.end())
  {
    Ioss::PropertyManager properties;
    if (has_multiple_files)
    {
      properties.add(Ioss::Property("my_processor", processor));
      properties.add(Ioss::Property("processor_count", iter->second.ProcessCount));
    }
#ifdef SEACAS_HAVE_MPI_WITH_ALL_BACKENDS
    else
    {
      properties.add(Ioss::Property("DECOMPOSITION_METHOD", "Linear"));
    }
#endif

    // tell the reader to read all blocks, even if empty. necessary to avoid
    // having to read all files to gather metadata, if possible
    // see paraview/paraview#20873.
    properties.add(Ioss::Property("RETAIN_EMPTY_BLOCKS", "on"));

    // strip trailing underscores in CGNS files to turn separate fields into
    // vectors with components.
    // see https://github.com/sandialabs/seacas/issues/265
    properties.add(Ioss::Property("FIELD_STRIP_TRAILING_UNDERSCORE", "on"));

    // Do not convert variable names to lower case. The default is on.
    // For ex: this resolves a misunderstanding b/w T (temperature) vs t (time)
    properties.add(Ioss::Property("LOWER_CASE_VARIABLE_NAMES", "off"));

    // Only read timestep information from 0th file.
    properties.add(Ioss::Property("EXODUS_CALL_GET_ALL_TIMES", processor == 0 ? "on" : "off"));

    // Split side sets into side-blocks by the element block of the originating side.
    // This allows rendering sides with partial scalars inherited from the element block.
    properties.add(Ioss::Property("SURFACE_SPLIT_TYPE", "BLOCK"));

    // Fillup with user-specified properties.
    Ioss::NameList names;
    this->DatabaseProperties.describe(&names);

    for (const auto& name : names)
    {
      properties.add(this->DatabaseProperties.get(name));
    }