CompositePolyDataMapper
VTKExamples/Cxx/CompositeData/CompositePolyDataMapper
Question
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Code¶
CompositePolyDataMapper.cxx
#include <vtkMultiBlockDataSet.h> #include <vtkSphereSource.h> #include <vtkNew.h> #include <vtkCompositePolyDataMapper2.h> #include <vtkCompositeDataDisplayAttributes.h> #include <vtkActor.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> int main( int /* argc */, char * /* argv */ [] ) { vtkNew<vtkSphereSource> sphere1; sphere1->SetRadius(3); sphere1->SetCenter(0,0,0); sphere1->Update(); vtkNew<vtkSphereSource> sphere2; sphere2->SetRadius(2); sphere2->SetCenter(2,0,0); sphere2->Update(); vtkNew<vtkMultiBlockDataSet> mbds; mbds->SetNumberOfBlocks(3); mbds->SetBlock(0, sphere1->GetOutput()); // Leave block 1 NULL. NULL blocks are valid and should be handled by // algorithms that process multiblock datasets. Especially when // running in parallel where the blocks owned by other processes are // NULL in this process. mbds->SetBlock(2, sphere2->GetOutput()); vtkNew<vtkCompositePolyDataMapper2> mapper; mapper->SetInputDataObject(mbds.GetPointer()); vtkNew<vtkCompositeDataDisplayAttributes> cdsa; mapper->SetCompositeDataDisplayAttributes(cdsa.Get()); // You can use the vtkCompositeDataDisplayAttributes to set the color, // opacity and visibiliy of individual blocks of the multiblock dataset. // Attributes are mapped by block pointers (vtkDataObject*), so these can // be queried by their flat index through a convenience function in the // attribute class (vtkCompositeDataDisplayAttributes::DataObjectFromIndex). // Alternatively, one can set attributes directly through the mapper using // flat indices. // // This sets the block at flat index 3 red // Note that the index is the flat index in the tree, so the whole multiblock // is index 0 and the blocks are flat indexes 1, 2 and 3. This affects // the block returned by mbds->GetBlock(2). double color[] = {1, 0, 0}; mapper->SetBlockColor(3, color); vtkNew<vtkActor> actor; actor->SetMapper(mapper.Get()); vtkNew<vtkRenderer> renderer; vtkNew<vtkRenderWindow> renderWindow; renderWindow->AddRenderer(renderer.Get()); vtkNew<vtkRenderWindowInteractor> renderWindowInteractor; renderWindowInteractor->SetRenderWindow(renderWindow.Get()); renderer->AddActor(actor.Get()); renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(CompositePolyDataMapper) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersSources vtkInteractionStyle vtkRenderingCore vtkRenderingFreeType vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping CompositePolyDataMapper: ${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(CompositePolyDataMapper MACOSX_BUNDLE CompositePolyDataMapper.cxx ) target_link_libraries(CompositePolyDataMapper PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(CompositePolyDataMapper MACOSX_BUNDLE CompositePolyDataMapper.cxx ) target_link_libraries(CompositePolyDataMapper PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS CompositePolyDataMapper MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build CompositePolyDataMapper¶
Click here to download CompositePolyDataMapper and its CMakeLists.txt file. Once the tarball CompositePolyDataMapper.tar has been downloaded and extracted,
cd CompositePolyDataMapper/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:
./CompositePolyDataMapper
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.