VelocityProfile

// Translated from velProf.tcl.

#include <vtkActor.h>
#include <vtkAppendPolyData.h>
#include <vtkCamera.h>
#include <vtkMultiBlockDataSet.h>
#include <vtkMultiBlockPLOT3DReader.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkPolyDataNormals.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkStructuredGrid.h>
#include <vtkStructuredGridGeometryFilter.h>
#include <vtkStructuredGridOutlineFilter.h>
#include <vtkWarpVector.h>

#include <array>
#include <iostream>
#include <string>

int main(int argc, char* argv[])
{

  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " filename1 filename2" << std::endl;
    std::cout << "where: filename1 is combxyz.bin and filename2 is combq.bin."
              << std::endl;
    std::cout << "Produces figure 6-14(b) Flow momentum from the VTK Textbook."
              << std::endl;
    return EXIT_FAILURE;
  }

  std::string fileName1 = argv[1];
  std::string fileName2 = argv[2];

  vtkNew<vtkNamedColors> colors;

  std::array<unsigned char, 4> bkg{{65, 99, 149}};
  colors->SetColor("BkgColor", bkg.data());

  // Read a vtk file
  //
  vtkNew<vtkMultiBlockPLOT3DReader> pl3d;
  pl3d->SetXYZFileName(fileName1.c_str());
  pl3d->SetQFileName(fileName2.c_str());
  pl3d->SetScalarFunctionNumber(100); // Density
  pl3d->SetVectorFunctionNumber(202); // Momentum
  pl3d->Update();

  vtkStructuredGrid* pl3dOutput =
      dynamic_cast<vtkStructuredGrid*>(pl3d->GetOutput()->GetBlock(0));

  // What do we know about the data?
  // Get the extent of the data: imin, imax, jmin, jmax, kmin, kmax
  int extent[6] = {0, 0, 0, 0, 0, 0};
  pl3dOutput->GetExtent(extent);
  double scalarRange[2] = {0.0, 0.0};
  pl3dOutput->GetScalarRange(scalarRange);

  // Planes are specified using a imin, imax, jmin, jmax, kmin, kmax coordinate
  // specification. Min and max i,j,k values are clamped to 0 and maximum value.
  // See the variable named extent for the values.
  //
  vtkNew<vtkStructuredGridGeometryFilter> plane;
  plane->SetInputData(pl3dOutput);
  plane->SetExtent(10, 10, 1, extent[3], 1, extent[5]);

  vtkNew<vtkStructuredGridGeometryFilter> plane2;
  plane2->SetInputData(pl3dOutput);
  plane2->SetExtent(30, 30, 1, extent[3], 1, extent[5]);

  vtkNew<vtkStructuredGridGeometryFilter> plane3;
  plane3->SetInputData(pl3dOutput);
  plane3->SetExtent(45, 45, 1, extent[3], 1, extent[5]);

  // We use an append filter because that way we can do the warping, etc. just
  // using a single pipeline and actor.
  //
  vtkNew<vtkAppendPolyData> appendF;
  appendF->AddInputConnection(plane->GetOutputPort());
  appendF->AddInputConnection(plane2->GetOutputPort());
  appendF->AddInputConnection(plane3->GetOutputPort());

  // Warp
  vtkNew<vtkWarpVector> warp;
  warp->SetInputConnection(appendF->GetOutputPort());
  warp->SetScaleFactor(0.005);
  warp->Update();

  vtkNew<vtkPolyDataNormals> normals;
  normals->SetInputData(warp->GetPolyDataOutput());
  normals->SetFeatureAngle(45);

  vtkNew<vtkPolyDataMapper> planeMapper;
  planeMapper->SetInputConnection(normals->GetOutputPort());
  planeMapper->SetScalarRange(scalarRange);

  vtkNew<vtkActor> planeActor;
  planeActor->SetMapper(planeMapper);

  // The outline provides context for the data and the planes.
  vtkNew<vtkStructuredGridOutlineFilter> outline;
  outline->SetInputData(pl3dOutput);

  vtkNew<vtkPolyDataMapper> outlineMapper;
  outlineMapper->SetInputConnection(outline->GetOutputPort());

  vtkNew<vtkActor> outlineActor;
  outlineActor->SetMapper(outlineMapper);
  outlineActor->GetProperty()->SetColor(colors->GetColor3d("Black").GetData());

  // Create the RenderWindow, Renderer and both Actors.
  //
  vtkNew<vtkRenderer> ren;
  vtkNew<vtkRenderWindow> renWin;
  renWin->AddRenderer(ren);

  vtkNew<vtkRenderWindowInteractor> iren;
  iren->SetRenderWindow(renWin);

  // Add the actors to the renderer, set the background and size.
  //
  ren->AddActor(planeActor);
  ren->AddActor(outlineActor);
  ren->SetBackground(colors->GetColor3d("BkgColor").GetData());

  renWin->SetSize(512, 512);
  renWin->SetWindowName("VelocityProfile");

  iren->Initialize();

  renWin->Render();

  ren->GetActiveCamera()->SetPosition(19.8562, -31.8912, 47.0755);
  ren->GetActiveCamera()->SetFocalPoint(8.255, 0.147815, 29.7631);
  ren->GetActiveCamera()->SetViewUp(-0.0333325, 0.465756, 0.884285);
  ren->GetActiveCamera()->SetClippingRange(17.3078, 64.6375);
  renWin->Render();

  iren->Start();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(VelocityProfile)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "VelocityProfile: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(VelocityProfile MACOSX_BUNDLE VelocityProfile.cxx )
  target_link_libraries(VelocityProfile PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS VelocityProfile
  MODULES ${VTK_LIBRARIES}
)

cd VelocityProfile/build

cmake ..

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

make

./VelocityProfile