Function main

Examples/MultiBlock/Cxx/MultiBlock.cxx:30–148

#include <sstream>

int main(int argc, char* argv[])
{
  vtkCompositeDataPipeline* exec = vtkCompositeDataPipeline::New();
  vtkAlgorithm::SetDefaultExecutivePrototype(exec);
  exec->Delete();

  // Standard rendering classes
  vtkRenderer* ren = vtkRenderer::New();
  vtkRenderWindow* renWin = vtkRenderWindow::New();
  renWin->AddRenderer(ren);
  vtkRenderWindowInteractor* iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  // We will read three files and collect them together in one
  // multi-block dataset. I broke the combustor dataset into
  // three pieces and wrote them out separately.
  int i;
  vtkXMLStructuredGridReader* reader = vtkXMLStructuredGridReader::New();

  // vtkMultiBlockDataSet represents multi-block datasets. See
  // the class documentation for more information.
  vtkMultiBlockDataSet* mb = vtkMultiBlockDataSet::New();

  for (i = 0; i < 3; i++)
  {
    // Here we load the three separate files (each containing
    // a structured grid dataset)
    std::ostringstream fname;
    fname << "Data/multicomb_" << i << ".vts" << ends;
    char* cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, fname.str().c_str());
    reader->SetFileName(cfname);
    // We have to update since we are working without a VTK pipeline.
    // This will read the file and the output of the reader will be
    // a valid structured grid data.
    reader->Update();
    delete[] cfname;

    // We create a copy to avoid adding the same data three
    // times (the output object of the reader does not change
    // when the filename changes)
    vtkStructuredGrid* sg = vtkStructuredGrid::New();
    sg->ShallowCopy(reader->GetOutput());

    // Add the structured grid to the multi-block dataset
    mb->SetBlock(i, sg);
    sg->Delete();
  }
  reader->Delete();

  // Multi-block can be processed with regular VTK filters in two ways:
  // 1. Pass through a multi-block aware consumer. Since a multi-block
  //    aware mapper is not yet available, vtkCompositeDataGeometryFilter
  //    can be used
  // 2. Assign the composite executive (vtkCompositeDataPipeline) to
  //    all "simple" (that work only on simple, non-composite datasets) filters

  // outline
  vtkStructuredGridOutlineFilter* of = vtkStructuredGridOutlineFilter::New();