StructuredDataTypes

VTKEx/Cxx/Visualization/StructuredDataTypes

Question

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Code

StructuredDataTypes.cxx

#include <vtkDataSetMapper.h>
#include <vtkDoubleArray.h>
#include <vtkImageData.h>
#include <vtkProperty.h>
#include <vtkRectilinearGrid.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkStructuredGrid.h>
#include <vtkTransform.h>
#include <vtkXMLImageDataWriter.h>
#include <vtkXMLRectilinearGridWriter.h>
#include <vtkXMLStructuredGridWriter.h>

namespace
{
  void ImageData(vtkImageData* data, const int gridSize);
  void RectilinearGrid(vtkRectilinearGrid* data, const int gridSize);
  void StructuredGrid(vtkStructuredGrid* data, const int gridSize);
}

int main(int, char*[])
{
  int gridSize = 5;
  vtkSmartPointer<vtkImageData> imageData =
    vtkSmartPointer<vtkImageData>::New();
  ImageData(imageData, gridSize);
  vtkSmartPointer<vtkDataSetMapper> imageDataMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  imageDataMapper->SetInputData(imageData);
  imageDataMapper->ScalarVisibilityOff();

  vtkSmartPointer<vtkActor> imageDataActor =
    vtkSmartPointer<vtkActor>::New();
  imageDataActor->GetProperty()->SetRepresentationToWireframe();
  imageDataActor->SetMapper(imageDataMapper);

  vtkSmartPointer<vtkRectilinearGrid> rectilinearGrid =
    vtkSmartPointer<vtkRectilinearGrid>::New();
  RectilinearGrid(rectilinearGrid, gridSize);
  vtkSmartPointer<vtkDataSetMapper> rectilinearGridMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  rectilinearGridMapper->SetInputData(rectilinearGrid);

  vtkSmartPointer<vtkActor> rectilinearGridActor =
    vtkSmartPointer<vtkActor>::New();
  rectilinearGridActor->GetProperty()->SetRepresentationToWireframe();
  rectilinearGridActor->SetMapper(rectilinearGridMapper);

  vtkSmartPointer<vtkStructuredGrid> structuredGrid =
    vtkSmartPointer<vtkStructuredGrid>::New();
  StructuredGrid(structuredGrid, gridSize);
  vtkSmartPointer<vtkDataSetMapper> structuredGridMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  structuredGridMapper->SetInputData(structuredGrid);

  vtkSmartPointer<vtkActor> structuredGridActor =
    vtkSmartPointer<vtkActor>::New();
  structuredGridActor->GetProperty()->SetRepresentationToWireframe();
  structuredGridActor->SetMapper(structuredGridMapper);

  // There will be one render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);

  // And one interactor
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = { 0.0, 0.0, 0.33, 1.0 };
  double centerViewport[4] = { 0.33, 0.0, 0.66, 1.0 };
  double rightViewport[4] = { 0.66, 0.0, 1.0, 1.0 };

  // Setup three renderers
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->SetBackground(.6, .5, .4);

  vtkSmartPointer<vtkRenderer> centerRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(centerRenderer);
  centerRenderer->SetViewport(centerViewport);
  centerRenderer->SetBackground(.4, .5, .6);

  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->SetBackground(.5, .4, .6);

  // Add the image on the left, rectilinear in the center, structured on the
  // right
  leftRenderer->AddActor(imageDataActor);
  centerRenderer->AddActor(rectilinearGridActor);
  rightRenderer->AddActor(structuredGridActor);

  leftRenderer->ResetCamera();
  centerRenderer->ResetCamera();
  rightRenderer->ResetCamera();
  // rightRenderer->GetActiveCamera()->Azimuth(30);
  // rightRenderer->GetActiveCamera()->Elevation(30);

  renderWindow->Render();
  interactor->Start();
  return EXIT_SUCCESS;
}

namespace
{

  void ImageData(vtkImageData* data, const int gridSize)
  {

    data->SetExtent(0, gridSize - 1, 0, gridSize - 1, 0, gridSize - 1);
    data->AllocateScalars(VTK_DOUBLE, 1);

    vtkSmartPointer<vtkXMLImageDataWriter> writer =
      vtkSmartPointer<vtkXMLImageDataWriter>::New();
    writer->SetFileName("imagedata.vti");
    writer->SetInputData(data);
    writer->Write();
  }

  void RectilinearGrid(vtkRectilinearGrid* data, const int gridSize)
  {

    data->SetExtent(0, gridSize - 1, 0, gridSize - 1, 0, gridSize - 1);

    vtkSmartPointer<vtkDoubleArray> xCoords =
      vtkSmartPointer<vtkDoubleArray>::New();
    xCoords->SetNumberOfComponents(1);
    vtkSmartPointer<vtkDoubleArray> yCoords =
      vtkSmartPointer<vtkDoubleArray>::New();
    yCoords->SetNumberOfComponents(1);
    vtkSmartPointer<vtkDoubleArray> zCoords =
      vtkSmartPointer<vtkDoubleArray>::New();
    zCoords->SetNumberOfComponents(1);

    for (int i = 0; i < gridSize; i++)
    {
      if (i == 0)
      {
        xCoords->InsertNextValue(0);
        yCoords->InsertNextValue(0);
        zCoords->InsertNextValue(0);
        continue;
      }
      double oldX = xCoords->GetValue(i - 1);
      double oldY = xCoords->GetValue(i - 1);
      double oldZ = xCoords->GetValue(i - 1);
      xCoords->InsertNextValue(oldX + i * i);
      yCoords->InsertNextValue(oldY + i * i);
      zCoords->InsertNextValue(oldZ + i * i);
    }

    data->SetXCoordinates(xCoords);
    data->SetYCoordinates(yCoords);
    data->SetZCoordinates(zCoords);

    vtkSmartPointer<vtkXMLRectilinearGridWriter> writer =
      vtkSmartPointer<vtkXMLRectilinearGridWriter>::New();
    writer->SetFileName("rectilineargrid.vtr");
    writer->SetInputData(data);
    writer->Write();
  }

  void StructuredGrid(vtkStructuredGrid* data, const int gridSize)
  {
    data->SetExtent(0, gridSize - 1, 0, gridSize - 1, 0, gridSize - 1);
    vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();

    vtkSmartPointer<vtkTransform> transform =
      vtkSmartPointer<vtkTransform>::New();
    transform->RotateZ(30);

    for (int k = 0; k < gridSize; k++)
    {
      for (int j = 0; j < gridSize; j++)
      {
        for (int i = 0; i < gridSize; i++)
        {
          double p[4];
          p[0] = i;
          p[1] = j;
          p[2] = k;
          p[3] = 1;
          double pout[4];
          transform->MultiplyPoint(p, pout);

          points->InsertNextPoint(pout[0], pout[1], pout[2]);
        }
      }
    }

    data->SetPoints(points);

    vtkSmartPointer<vtkXMLStructuredGridWriter> writer =
      vtkSmartPointer<vtkXMLStructuredGridWriter>::New();
    writer->SetFileName("structuredgrid.vts");
    writer->SetInputData(data);
    writer->Write();
  }
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(StructuredDataTypes)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkCommonTransforms
  vtkvtkIOXML
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping StructuredDataTypes: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(StructuredDataTypes MACOSX_BUNDLE StructuredDataTypes.cxx )
  target_link_libraries(StructuredDataTypes PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(StructuredDataTypes MACOSX_BUNDLE StructuredDataTypes.cxx )
  target_link_libraries(StructuredDataTypes PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS StructuredDataTypes
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build StructuredDataTypes

Click here to download StructuredDataTypes and its CMakeLists.txt file. Once the tarball StructuredDataTypes.tar has been downloaded and extracted,

cd StructuredDataTypes/build

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./StructuredDataTypes

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.