DataAnimation

VTKExamples/Cxx/Utilities/DataAnimation

Description

This causes one point of the sphere to be moved outwards at each iteration.

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

DataAnimation.cxx

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProgrammableFilter.h>
#include <vtkCallbackCommand.h>

void TimerCallbackFunction ( vtkObject* caller, long unsigned int eventId, void* clientData, void* callData );

// Globals
unsigned int counter2 = 0;

void AdjustPoints2(void* arguments)
{
  std::cout << "AdjustPoints2" << std::endl;
  vtkProgrammableFilter* programmableFilter =
      static_cast<vtkProgrammableFilter*>(arguments);

  vtkPoints* inPts = programmableFilter->GetPolyDataInput()->GetPoints();
  vtkIdType numPts = inPts->GetNumberOfPoints();
  vtkSmartPointer<vtkPoints> newPts =
      vtkSmartPointer<vtkPoints>::New();
  newPts->SetNumberOfPoints(numPts);

  for(vtkIdType i = 0; i < numPts; i++)
  {
    double p[3];
    inPts->GetPoint(i, p);
    newPts->SetPoint(i, p);
  }

  double p0[3];
  inPts->GetPoint(0, p0);
  p0[2] = p0[2] + counter2 * 0.1;
  newPts->SetPoint(0, p0);

  programmableFilter->GetPolyDataOutput()->CopyStructure(programmableFilter->GetPolyDataInput());
  programmableFilter->GetPolyDataOutput()->SetPoints(newPts);
}

int main(int, char *[])
{
  // Create a sphere
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  vtkSmartPointer<vtkProgrammableFilter> programmableFilter =
    vtkSmartPointer<vtkProgrammableFilter>::New();
  programmableFilter->SetInputConnection(sphereSource->GetOutputPort());

  programmableFilter->SetExecuteMethod(AdjustPoints2, programmableFilter);

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(programmableFilter->GetOutputPort());
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // Create a renderer, render window, and interactor
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Initialize must be called prior to creating timer events.
  renderWindowInteractor->Initialize();
  renderWindowInteractor->CreateRepeatingTimer(500);

  vtkSmartPointer<vtkCallbackCommand> timerCallback =
    vtkSmartPointer<vtkCallbackCommand>::New();
  timerCallback->SetCallback ( TimerCallbackFunction );
  timerCallback->SetClientData(programmableFilter);

  renderWindowInteractor->AddObserver ( vtkCommand::TimerEvent, timerCallback );

  // Add the actor to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white

  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}


void TimerCallbackFunction ( vtkObject* caller, long unsigned int vtkNotUsed(eventId), void* clientData, void* vtkNotUsed(callData) )
{
  cout << "timer callback" << endl;

  vtkSmartPointer<vtkProgrammableFilter> programmableFilter =
      static_cast<vtkProgrammableFilter*>(clientData);

  vtkRenderWindowInteractor *iren =
    static_cast<vtkRenderWindowInteractor*>(caller);

  programmableFilter->Modified();

  iren->Render();

  counter2++;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(DataAnimation)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkFiltersProgrammable
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping DataAnimation: ${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(DataAnimation MACOSX_BUNDLE DataAnimation.cxx )
  target_link_libraries(DataAnimation PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(DataAnimation MACOSX_BUNDLE DataAnimation.cxx )
  target_link_libraries(DataAnimation PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS DataAnimation
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build DataAnimation

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

cd DataAnimation/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:

./DataAnimation

WINDOWS USERS

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