MultiBlockDataSet
VTKExamples/Cxx/CompositeData/MultiBlockDataSet
Code
MultiBlockDataSet.cxx
// Demonstrates how to make and use VTK's MultiBlock type data
#include <vtkActor.h>
#include <vtkCompositeDataGeometryFilter.h>
#include <vtkExtractEdges.h>
#include <vtkMultiBlockDataSet.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
int main (int, char *[])
{
// PART 1 Make some Data
// make a tree
vtkSmartPointer<vtkMultiBlockDataSet> root =
vtkSmartPointer<vtkMultiBlockDataSet>::New();
vtkSmartPointer<vtkMultiBlockDataSet> branch =
vtkSmartPointer<vtkMultiBlockDataSet>::New();
root->SetBlock(0, branch);
// make some leaves
vtkSmartPointer<vtkSphereSource> leaf1 =
vtkSmartPointer<vtkSphereSource>::New();
leaf1->SetCenter(0,0,0);
leaf1->Update();
branch->SetBlock(0, leaf1->GetOutput());
vtkSmartPointer<vtkSphereSource> leaf2 =
vtkSmartPointer<vtkSphereSource>::New();
leaf2->SetCenter(1.75,2.5,0);
leaf2->SetRadius(1.5);
leaf2->Update();
branch->SetBlock(1, leaf2->GetOutput());
vtkSmartPointer<vtkSphereSource> leaf3 =
vtkSmartPointer<vtkSphereSource>::New();
leaf3->SetCenter(4,0,0);
leaf3->SetRadius(2);
leaf3->Update();
root->SetBlock(1, leaf3->GetOutput());
// uncomment to inspect
//std::cerr << root->GetClassName() << std::endl;
//root->PrintSelf(std::cerr, vtkIndent(0));
// PART 2 Do something with the data
// a non composite aware filter, the pipeline will iterate
vtkSmartPointer<vtkExtractEdges> edges =
vtkSmartPointer<vtkExtractEdges>::New();
edges->SetInputData(root);
// uncomment to inspect
//edges->Update();
//cerr << edges->GetOutputDataObject(0)->GetClassName() << endl;
//edges->GetOutputDataObject(0)->PrintSelf(std::cerr, vtkIndent(0));
// PART 3 Show the data
// also demonstrate a composite aware filter
// this filter aggregates all blocks into one polydata
// this is handy for display, although fairly limited
// see vtkCompositePolyDataMapper2 for something better
vtkSmartPointer<vtkCompositeDataGeometryFilter> polydata =
vtkSmartPointer<vtkCompositeDataGeometryFilter>::New();
polydata->SetInputConnection(edges->GetOutputPort());
// uncomment to inspect
//polydata->Update();
//std::cerr << polydata->GetOutput()->GetClassName() << std::endl;
//polydata->GetOutput()->PrintSelf(std::cerr, vtkIndent(0));
// display the data
vtkSmartPointer<vtkRenderer> aren = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
renWin->AddRenderer(aren);
vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
iren->SetRenderWindow(renWin);
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(0, polydata->GetOutputPort(0));
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
aren->AddActor(actor);
iren->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(MultiBlockDataSet)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(MultiBlockDataSet MACOSX_BUNDLE MultiBlockDataSet.cxx)
target_link_libraries(MultiBlockDataSet ${VTK_LIBRARIES})
Download and Build MultiBlockDataSet
Click here to download MultiBlockDataSet and its CMakeLists.txt file. Once the tarball MultiBlockDataSet.tar has been downloaded and extracted,
cd MultiBlockDataSet/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:
./MultiBlockDataSet
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.