VTK/Examples/Cxx/Developers/MultipleInputPorts

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Revision as of 14:53, 12 February 2016 by Waldyrious (talk | contribs) (+link that may be useful for those coming from google)
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See also the vtkAppendPolyData class (example usage).

MultipleInputPorts.cxx

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>

#include "vtkTestFilter.h"

int main (int argc, char *argv[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource1 =
      vtkSmartPointer<vtkSphereSource>::New();
  sphereSource1->SetThetaResolution(5);
  sphereSource1->Update();

  vtkSmartPointer<vtkSphereSource> sphereSource2 =
      vtkSmartPointer<vtkSphereSource>::New();
  sphereSource2->SetThetaResolution(10);
  sphereSource2->Update();

  vtkSmartPointer<vtkTestFilter> filter =
      vtkSmartPointer<vtkTestFilter>::New();
  filter->SetInputConnection(0, sphereSource1->GetOutputPort());
  filter->SetInputConnection(1, sphereSource2->GetOutputPort());
  filter->Update();

  return EXIT_SUCCESS;
}

TestFilter.h

// .NAME vtkTestFilter
// .SECTION Description
// vtkTestFilter

#ifndef __vtkTestFilter_h
#define __vtkTestFilter_h

#include "vtkPolyDataAlgorithm.h"

class vtkTestFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkTestFilter,vtkPolyDataAlgorithm);
  static vtkTestFilter *New();

protected:
  vtkTestFilter();
  ~vtkTestFilter(){}

  int FillInputPortInformation( int port, vtkInformation* info );
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

private:
  vtkTestFilter(const vtkTestFilter&);  // Not implemented.
  void operator=(const vtkTestFilter&);  // Not implemented.

};

#endif

TestFilter.cxx

#include "vtkTestFilter.h"

#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkInformationVector.h"
#include "vtkInformation.h"
#include "vtkDataObject.h"
#include "vtkSmartPointer.h"

vtkStandardNewMacro(vtkTestFilter);

vtkTestFilter::vtkTestFilter()
{
  this->SetNumberOfInputPorts(2);
}

int vtkTestFilter::FillInputPortInformation( int port, vtkInformation* info )
{
  if ( port == 0 )
    {
    info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkPolyData" );
    return 1;
    }
  else if(port == 1)
    {
    info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkPolyData" );
    return 1;
    }

  return 0;
}

int vtkTestFilter::RequestData(vtkInformation *vtkNotUsed(request),
                                             vtkInformationVector **inputVector,
                                             vtkInformationVector *outputVector)
{

  // get the info objects
  vtkInformation *inInfo0 = inputVector[0]->GetInformationObject(0);
  vtkInformation *inInfo1 = inputVector[1]->GetInformationObject(0);

  vtkInformation *outInfo = outputVector->GetInformationObject(0);


  // get the input and ouptut
  vtkPolyData *input0 = vtkPolyData::SafeDownCast(
      inInfo0->Get(vtkDataObject::DATA_OBJECT()));

  std::cout << "input0 has " << input0->GetNumberOfPoints() << " points." << std::endl;

  vtkPolyData *input1 = vtkPolyData::SafeDownCast(
      inInfo1->Get(vtkDataObject::DATA_OBJECT()));

  std::cout << "input1 has " << input1->GetNumberOfPoints() << " points." << std::endl;

  vtkPolyData *output = vtkPolyData::SafeDownCast(
      outInfo->Get(vtkDataObject::DATA_OBJECT()));

  output->ShallowCopy(input0);

  return 1;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(MultipleInputPorts)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(MultipleInputPorts MACOSX_BUNDLE MultipleInputPorts.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(MultipleInputPorts ${VTK_LIBRARIES})
else()
  target_link_libraries(MultipleInputPorts vtkHybrid vtkWidgets)
endif()

Download and Build MultipleInputPorts

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

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

cd MultipleInputPorts/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:

./MultipleInputPorts

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.