VTK/Examples/Cxx/Demos/VisualDebugging

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VisualDebugging.cxx

#include <vtkSphereSource.h>
#include <vtkObjectFactory.h>
#include <vtkCommand.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleTrackballCamera.h>
 
#include "vtkTestFilter.h"
 
class CustomStyle : public vtkInteractorStyleTrackballCamera
{
  public:
    static CustomStyle* New();
    vtkTypeMacro(CustomStyle, vtkInteractorStyleTrackballCamera);
 
    CustomStyle()
    {
      this->Actor = vtkSmartPointer<vtkActor>::New();
      this->Mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
      this->Filter = vtkSmartPointer<vtkTestFilter>::New();
    }
 
    void CallbackFunction(vtkObject* caller,
                    long unsigned int eventId,
                    void* callData )
    {
      std::cout << "CustomStyle::CallbackFunction called." << std::endl;
      vtkPolyData* intermediate = this->Filter->GetIntermediateOutput();
      intermediate->Modified();
      this->Mapper->SetInput(intermediate);
      this->Renderer->ResetCamera();
      this->Renderer->Render();
      this->Interactor->GetRenderWindow()->Render();
    }
 
    void OnKeyPress()
    {
      // Get the keypress
      std::string key = this->Interactor->GetKeySym();
 
      if(key == "s") // 'S'tart
        {
        this->Renderer->AddActor(this->Actor);
        this->Filter->AddObserver(this->Filter->RefreshEvent, this, &CustomStyle::CallbackFunction);
        this->Filter->Update();
 
        this->Actor->SetMapper(this->Mapper);
        }
 
      // Forward events
      vtkInteractorStyleTrackballCamera::OnKeyPress();
    }
 
  vtkRenderer* Renderer;
  vtkSmartPointer<vtkActor> Actor;
  vtkSmartPointer<vtkPolyDataMapper> Mapper;
  vtkSmartPointer<vtkTestFilter> Filter;
 
};
vtkStandardNewMacro(CustomStyle);
 
int main(int argc, char *argv[])
{
  // 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);
 
  renderer->SetBackground(1,1,1); // White
 
  vtkSmartPointer<CustomStyle> style =
    vtkSmartPointer<CustomStyle>::New();
  style->Renderer = renderer;
 
  renderWindowInteractor->SetInteractorStyle(style);
  renderWindow->Render();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}

vtkTestFilter.cxx

#include "vtkTestFilter.h"
 
#include "vtkObjectFactory.h"
#include "vtkCommand.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkInformationVector.h"
#include "vtkInformation.h"
#include "vtkDataObject.h"
#include "vtkSmartPointer.h"
#include "vtkAppendPolyData.h"
#include "vtkSphereSource.h"
 
vtkStandardNewMacro(vtkTestFilter);
 
vtkTestFilter::vtkTestFilter()
{
  this->SetNumberOfInputPorts(0);
  this->Output = vtkSmartPointer<vtkPolyData>::New();
 
  this->RefreshEvent = vtkCommand::UserEvent + 1;
 
}
 
int vtkTestFilter::RequestData(vtkInformation *vtkNotUsed(request),
                                             vtkInformationVector **inputVector,
                                             vtkInformationVector *outputVector)
{
  // Get the info object
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
 
  vtkPolyData *output = vtkPolyData::SafeDownCast(
      outInfo->Get(vtkDataObject::DATA_OBJECT()));
 
  this->Output->DeepCopy(output);
 
  for(unsigned int i = 0; i < 10; i++)
    {
    Iterate(i);
    this->InvokeEvent(this->RefreshEvent, NULL);
    }
 
  output->ShallowCopy(this->Output);
 
  return 1;
}
 
void vtkTestFilter::Iterate(unsigned int iteration)
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetCenter(iteration, 0, 0);
  sphereSource->SetRadius(0.2);
  sphereSource->Update();
 
  vtkSmartPointer<vtkAppendPolyData> appendFilter =
    vtkSmartPointer<vtkAppendPolyData>::New();
  appendFilter->AddInputConnection(this->Output->GetProducerPort());
  appendFilter->AddInputConnection(sphereSource->GetOutputPort());
  appendFilter->Update();
 
  this->Output->DeepCopy(appendFilter->GetOutput());
}

vtkTestFilter.h

#ifndef __vtkTestFilter_h
#define __vtkTestFilter_h
 
#include "vtkPolyDataAlgorithm.h"
#include "vtkSmartPointer.h"
 
class vtkTestFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkTestFilter,vtkPolyDataAlgorithm);
  static vtkTestFilter *New();
 
  vtkPolyData* GetIntermediateOutput() {return this->Output;}
 
  int RefreshEvent;
 
protected:
  vtkTestFilter();
 
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
 
  void Iterate(unsigned int iteration);
 
  vtkSmartPointer<vtkPolyData> Output;
private:
  vtkTestFilter(const vtkTestFilter&);  // Not implemented.
  void operator=(const vtkTestFilter&);  // Not implemented.
 
};
 
#endif

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(VisualDebugging)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
add_executable(VisualDebugging MACOSX_BUNDLE VisualDebugging.cxx)
 
if(VTK_LIBRARIES)
  target_link_libraries(VisualDebugging ${VTK_LIBRARIES})
else()
  target_link_libraries(VisualDebugging vtkHybrid vtkWidgets)
endif()

Download and Build VisualDebugging

Click here to download VisualDebugging. and its CMakeLists.txt file.

Once the tarball VisualDebugging.tar has been downloaded and extracted,

cd VisualDebugging/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:

./VisualDebugging

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