Method RequestData

IO/LAS/vtkLASReader.cxx:43–77

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkLASReader::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(request), vtkInformationVector* outputVector)
{
  // Get the info object
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // Get the output
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  // Open LAS File for reading
  vtksys::ifstream ifs;
  ifs.open(this->FileName, std::ios_base::binary | std::ios_base::in);

  if (!ifs.is_open())
  {
    vtkErrorMacro(<< "Unable to open file for reading: " << this->FileName);
    return VTK_ERROR;
  }

  // Read header data
  liblas::ReaderFactory readerFactory;
  liblas::Reader reader = readerFactory.CreateWithStream(ifs);

  vtkNew<vtkPolyData> pointsPolyData;
  this->ReadPointRecordData(reader, pointsPolyData);
  ifs.close();

  // Convert points to verts in output polydata
  vtkNew<vtkVertexGlyphFilter> vertexFilter;
  vertexFilter->SetInputData(pointsPolyData);
  vertexFilter->Update();
  output->ShallowCopy(vertexFilter->GetOutput());

  return VTK_OK;
}

//------------------------------------------------------------------------------
void vtkLASReader::ReadPointRecordData(liblas::Reader& reader, vtkPolyData* pointsPolyData)