VisualizeStructuredGridCells
VTKExamples/Cxx/StructuredGrid/VisualizeStructuredGridCells
Code¶
VisualizeStructuredGridCells.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkActor.h> #include <vtkDataSetMapper.h> #include <vtkMath.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkShrinkFilter.h> #include <vtkStructuredGrid.h> #include <vtkUnstructuredGrid.h> int main(int, char *[]) { // Create a grid vtkSmartPointer<vtkStructuredGrid> structuredGrid = vtkSmartPointer<vtkStructuredGrid>::New(); vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); unsigned int numi = 3; unsigned int numj = 4; unsigned int numk = 5; for(unsigned int k = 0; k < numk; k++) { for(unsigned int j = 0; j < numj; j++) { for(unsigned int i = 0; i < numi; i++) { points->InsertNextPoint(i, j, k); } } } // Specify the dimensions of the grid structuredGrid->SetDimensions(numi, numj, numk); structuredGrid->SetPoints(points); std::cout << "There are " << structuredGrid->GetNumberOfPoints() << " points before shrinking." << std::endl; std::cout << "There are " << structuredGrid->GetNumberOfCells() << " cells before shrinking." << std::endl; vtkSmartPointer<vtkShrinkFilter> shrinkFilter = vtkSmartPointer<vtkShrinkFilter>::New(); #if VTK_MAJOR_VERSION <= 5 shrinkFilter->SetInputConnection(structuredGrid->GetProducerPort()); #else shrinkFilter->SetInputData(structuredGrid); #endif shrinkFilter->SetShrinkFactor(.8); shrinkFilter->Update(); std::cout << "There are " << shrinkFilter->GetOutput()->GetNumberOfPoints() << " points after shrinking." << std::endl; std::cout << "There are " << shrinkFilter->GetOutput()->GetNumberOfCells() << " cells after shrinking." << std::endl; // Note: there are more points after shrinking because cells no longer share points. // Create a mapper and actor vtkSmartPointer<vtkDataSetMapper> mapper = vtkSmartPointer<vtkDataSetMapper>::New(); mapper->SetInputConnection(shrinkFilter->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(.2, .3, .4); // Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(VisualizeStructuredGridCells) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(VisualizeStructuredGridCells MACOSX_BUNDLE VisualizeStructuredGridCells.cxx) target_link_libraries(VisualizeStructuredGridCells ${VTK_LIBRARIES})
Download and Build VisualizeStructuredGridCells¶
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The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download VisualizeStructuredGridCells and its CMakeLists.txt file. Once the tarball VisualizeStructuredGridCells.tar has been downloaded and extracted,
cd VisualizeStructuredGridCells/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:
./VisualizeStructuredGridCells
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.