ProgrammableFilter
VTKExamples/Cxx/Filtering/ProgrammableFilter
Question
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Code¶
ProgrammableFilter.cxx
#include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkProgrammableFilter.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> struct params { vtkPolyData* data; vtkProgrammableFilter* filter; }; void AdjustPoints(void* arguments) { params* input = static_cast<params*>(arguments); vtkPoints* inPts = input->data->GetPoints(); vtkIdType numPts = inPts->GetNumberOfPoints(); vtkSmartPointer<vtkPoints> newPts = vtkSmartPointer<vtkPoints>::New(); newPts->SetNumberOfPoints(numPts); for(vtkIdType i = 0; i < numPts/2; i++) { double p[3]; inPts->GetPoint(i, p); p[0] = p[0] + .5; p[1] = p[1] + .5; p[2] = p[2] + .5; newPts->SetPoint(i, p); } for(vtkIdType i = numPts/2; i < numPts; i++) { double p[3]; inPts->GetPoint(i, p); p[0] = p[0] - .5; p[1] = p[1] - .5; p[2] = p[2] - .5; newPts->SetPoint(i, p); } input->filter->GetPolyDataOutput()->CopyStructure(input->data); input->filter->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()); params myParams; myParams.data = sphereSource->GetOutput(); myParams.filter = programmableFilter; programmableFilter->SetExecuteMethod(AdjustPoints, &myParams); programmableFilter->Update(); //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); //Add the actor to the scene renderer->AddActor(actor); renderer->SetBackground(.4, .5, .6); // Background color white //Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(ProgrammableFilter) find_package(VTK COMPONENTS vtkCommonCore vtkFiltersProgrammable vtkFiltersSources vtkInteractionStyle vtkRenderingCore vtkRenderingFreeType vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping ProgrammableFilter: ${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(ProgrammableFilter MACOSX_BUNDLE ProgrammableFilter.cxx ) target_link_libraries(ProgrammableFilter PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(ProgrammableFilter MACOSX_BUNDLE ProgrammableFilter.cxx ) target_link_libraries(ProgrammableFilter PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS ProgrammableFilter MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build ProgrammableFilter¶
Click here to download ProgrammableFilter and its CMakeLists.txt file. Once the tarball ProgrammableFilter.tar has been downloaded and extracted,
cd ProgrammableFilter/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:
./ProgrammableFilter
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.