CutStructuredGrid
VTKExamples/Cxx/VisualizationAlgorithms/CutStructuredGrid
Description¶
This example cuts through structured grid with plane. The cut plane is shown solid shaded. A computational plane of constant value is shown in wireframe for comparison. The colors correspond to flow density. Cutting surfaces are not necessarily planes: implicit functions such as spheres, cylinders, and quadrics can also be used.
Info
See Figure 6-31 in Chapter 6 the VTK Textbook.
Other Languages
See (Python)
Question
If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum
Code¶
CutStructuredGrid.cxx
#include <vtkActor.h> #include <vtkCamera.h> #include <vtkCutter.h> #include <vtkDataSetMapper.h> #include <vtkMultiBlockDataSet.h> #include <vtkMultiBlockPLOT3DReader.h> #include <vtkNamedColors.h> #include <vtkPlane.h> #include <vtkPointData.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkStructuredGrid.h> #include <vtkStructuredGridGeometryFilter.h> #include <vtkStructuredGridOutlineFilter.h> int main(int argc, char *argv[]) { if (argc < 3) { std::cout << "Usage: " << argv[0] << " combxyz.bin combq.bin" << std::endl; return EXIT_FAILURE; } // Create the RenderWindow, Renderer and both Actors // vtkSmartPointer<vtkNamedColors> colors = vtkSmartPointer<vtkNamedColors>::New(); vtkSmartPointer<vtkRenderer> ren1 = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New(); renWin->AddRenderer(ren1); vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New(); iren->SetRenderWindow(renWin); // cut data vtkSmartPointer<vtkMultiBlockPLOT3DReader> pl3d = vtkSmartPointer<vtkMultiBlockPLOT3DReader>::New(); pl3d->SetXYZFileName(argv[1]); pl3d->SetQFileName(argv[2]); pl3d->SetScalarFunctionNumber(100); pl3d->SetVectorFunctionNumber(202); pl3d->Update(); vtkStructuredGrid *sg = dynamic_cast<vtkStructuredGrid*>(pl3d->GetOutput()->GetBlock(0)); vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New(); plane->SetOrigin(sg->GetCenter()); plane->SetNormal(-0.287, 0, 0.9579); vtkSmartPointer<vtkCutter> planeCut = vtkSmartPointer<vtkCutter>::New(); planeCut->SetInputData(pl3d->GetOutput()->GetBlock(0)); planeCut->SetCutFunction(plane); vtkSmartPointer<vtkDataSetMapper> cutMapper = vtkSmartPointer<vtkDataSetMapper>::New(); cutMapper->SetInputConnection(planeCut->GetOutputPort()); cutMapper->SetScalarRange(sg->GetPointData()->GetScalars()->GetRange()); vtkSmartPointer<vtkActor> cutActor = vtkSmartPointer<vtkActor>::New(); cutActor->SetMapper(cutMapper); //extract plane vtkSmartPointer<vtkStructuredGridGeometryFilter> compPlane = vtkSmartPointer<vtkStructuredGridGeometryFilter>::New(); compPlane->SetInputData(sg); compPlane->SetExtent(0, 100, 0, 100, 9, 9); vtkSmartPointer<vtkPolyDataMapper> planeMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); planeMapper->SetInputConnection(compPlane->GetOutputPort()); planeMapper->ScalarVisibilityOff(); vtkSmartPointer<vtkActor> planeActor = vtkSmartPointer<vtkActor>::New(); planeActor->SetMapper(planeMapper); planeActor->GetProperty()->SetRepresentationToWireframe(); planeActor->GetProperty()->SetColor(colors->GetColor3d("Wheat").GetData()); //outline vtkSmartPointer<vtkStructuredGridOutlineFilter> outline = vtkSmartPointer<vtkStructuredGridOutlineFilter>::New(); outline->SetInputData(pl3d->GetOutput()->GetBlock(0)); vtkSmartPointer<vtkPolyDataMapper> outlineMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); outlineMapper->SetInputConnection(outline->GetOutputPort()); vtkSmartPointer<vtkActor> outlineActor = vtkSmartPointer<vtkActor>::New(); outlineActor->SetMapper(outlineMapper); outlineActor->GetProperty()->SetColor(colors->GetColor3d("Wheat").GetData()); // Add the actors to the renderer, set the background and size // ren1->AddActor(outlineActor); ren1->AddActor(planeActor); ren1->AddActor(cutActor); ren1->SetBackground(colors->GetColor3d("SlateGray").GetData()); renWin->SetSize(640, 480); ren1->GetActiveCamera()->SetClippingRange(3.95297, 50); ren1->GetActiveCamera()->SetFocalPoint(9.71821, 0.458166, 29.3999); ren1->GetActiveCamera()->SetPosition(2.7439, -37.3196, 38.7167); ren1->GetActiveCamera()->SetViewUp(-0.16123, 0.264271, 0.950876); ren1->ResetCamera(); ren1->GetActiveCamera()->Elevation(30); // render the image // renWin->Render(); iren->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(CutStructuredGrid) find_package(VTK COMPONENTS vtkCommonColor vtkCommonDataModel vtkFiltersCore vtkFiltersGeometry vtkIOParallel vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping CutStructuredGrid: ${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(CutStructuredGrid MACOSX_BUNDLE CutStructuredGrid.cxx ) target_link_libraries(CutStructuredGrid PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(CutStructuredGrid MACOSX_BUNDLE CutStructuredGrid.cxx ) target_link_libraries(CutStructuredGrid PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS CutStructuredGrid MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build CutStructuredGrid¶
Click here to download CutStructuredGrid and its CMakeLists.txt file. Once the tarball CutStructuredGrid.tar has been downloaded and extracted,
cd CutStructuredGrid/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:
./CutStructuredGrid
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.