MultipleInputPorts
vtk-examples/Cxx/Developers/MultipleInputPorts
Question
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Code¶
MultipleInputPorts.cxx
#include <vtkNew.h>
#include <vtkSphereSource.h>
#include "vtkTestMultipleInputPortsFilter.h"
int main(int /* argc */, char* /* argv */[])
{
vtkNew<vtkSphereSource> sphereSource1;
sphereSource1->SetThetaResolution(5);
sphereSource1->Update();
vtkNew<vtkSphereSource> sphereSource2;
sphereSource2->SetThetaResolution(10);
sphereSource2->Update();
vtkNew<vtkTestMultipleInputPortsFilter> filter;
filter->SetInputConnection(0, sphereSource1->GetOutputPort());
filter->SetInputConnection(1, sphereSource2->GetOutputPort());
filter->Update();
return EXIT_SUCCESS;
}
vtkTestMultipleInputPortsFilter.h
// .NAME vtkTestMultipleInputPortsFilter
// .SECTION Description
// vtkTestMultipleInputPortsFilter
#ifndef __vtkTestMultipleInputPortsFilter_h
#define __vtkTestMultipleInputPortsFilter_h
#include <vtkPolyDataAlgorithm.h>
class vtkTestMultipleInputPortsFilter : public vtkPolyDataAlgorithm
{
public:
static vtkTestMultipleInputPortsFilter *New();
vtkTypeMacro(vtkTestMultipleInputPortsFilter,vtkPolyDataAlgorithm);
protected:
vtkTestMultipleInputPortsFilter();
~vtkTestMultipleInputPortsFilter() {}
int FillInputPortInformation( int port, vtkInformation* info ) override;
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override;
private:
vtkTestMultipleInputPortsFilter(const vtkTestMultipleInputPortsFilter&) = delete;
void operator=(const vtkTestMultipleInputPortsFilter&) = delete;
};
#endif
vtkTestMultipleInputPortsFilter.cxx
#include "vtkTestMultipleInputPortsFilter.h"
#include <vtkObjectFactory.h>
#include <vtkStreamingDemandDrivenPipeline.h>
#include <vtkInformationVector.h>
#include <vtkInformation.h>
#include <vtkDataObject.h>
#include <vtkSmartPointer.h>
vtkStandardNewMacro(vtkTestMultipleInputPortsFilter);
vtkTestMultipleInputPortsFilter::vtkTestMultipleInputPortsFilter()
{
this->SetNumberOfInputPorts(2);
}
int vtkTestMultipleInputPortsFilter::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 vtkTestMultipleInputPortsFilter::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 = dynamic_cast<vtkPolyData*>(
inInfo0->Get(vtkDataObject::DATA_OBJECT()));
std::cout << "input0 has " << input0->GetNumberOfPoints() << " points." << std::endl;
vtkPolyData *input1 = dynamic_cast<vtkPolyData*>(
inInfo1->Get(vtkDataObject::DATA_OBJECT()));
std::cout << "input1 has " << input1->GetNumberOfPoints() << " points." << std::endl;
vtkPolyData *output = dynamic_cast<vtkPolyData*>(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
output->ShallowCopy(input0);
return 1;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(MultipleInputPorts)
find_package(VTK COMPONENTS
vtkCommonCore
vtkFiltersSources
QUIET
)
if (NOT VTK_FOUND)
message("Skipping MultipleInputPorts: ${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(MultipleInputPorts MACOSX_BUNDLE MultipleInputPorts.cxx )
target_link_libraries(MultipleInputPorts PRIVATE ${VTK_LIBRARIES})
else()
# 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(MultipleInputPorts MACOSX_BUNDLE MultipleInputPorts.cxx )
target_link_libraries(MultipleInputPorts PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS MultipleInputPorts
MODULES ${VTK_LIBRARIES}
)
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.