DataStructureComparison
VTKExamples/Cxx/DataStructures/DataStructureComparison
Description
Prior to August 20, 2010, the vtkModifiedBSPTree.cxx did not produce a proper data representation. To operate properly, update your vtk source tree.
Use the 'n' key (for 'N'ext) and the 'p' key (for 'P'revious) to navigate the levels of the trees.
Code
DataStructureComparison.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPointSource.h>
#include <vtkObjectFactory.h>
#include <vtkRendererCollection.h>
#include <vtkPolyData.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyDataMapper.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkSphereSource.h>
#include <vtkProperty.h>
#include <vtkCamera.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkKdTreePointLocator.h>
#include <vtkOctreePointLocator.h>
#include <vtkOBBTree.h>
#include <vtkModifiedBSPTree.h>
#include <vector>
class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static KeyPressInteractorStyle* New();
vtkSmartPointer<vtkPolyData> data;
std::vector<vtkRenderer*> renderers;
std::vector<vtkSmartPointer<vtkLocator> > trees;
std::vector<vtkSmartPointer<vtkPolyDataMapper> > mappers;
std::vector<vtkSmartPointer<vtkActor> > actors;
vtkSmartPointer<vtkPolyDataMapper> meshMapper;
vtkSmartPointer<vtkActor> meshActor;
void Initialize()
{
#if VTK_MAJOR_VERSION <= 5
this->meshMapper->SetInputConnection(this->data->GetProducerPort());
#else
this->meshMapper->SetInputData(this->data);
#endif
for(unsigned int i = 0; i < 4; i++)
{
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
this->mappers.push_back(mapper);
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetRepresentationToWireframe();
this->actors.push_back(actor);
this->renderers[i]->AddActor(actor);
this->renderers[i]->AddActor(meshActor);
}
this->Level = 1;
std::cout << "Level = " << this->Level << std::endl;
this->ReDraw();
}
KeyPressInteractorStyle()
{
this->Level = 1;
vtkSmartPointer<vtkLocator> tree0 = vtkSmartPointer<vtkKdTreePointLocator>::New();
this->trees.push_back(tree0);
vtkSmartPointer<vtkLocator> tree1 = vtkSmartPointer<vtkOBBTree>::New();
this->trees.push_back(tree1);
vtkSmartPointer<vtkLocator> tree2 = vtkSmartPointer<vtkOctreePointLocator>::New();
this->trees.push_back(tree2);
vtkSmartPointer<vtkLocator> tree3 = vtkSmartPointer<vtkModifiedBSPTree>::New();
this->trees.push_back(tree3);
this->meshMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
this->meshActor = vtkSmartPointer<vtkActor>::New();
this->meshActor->SetMapper(this->meshMapper);
}
virtual void OnChar()
{
char ch = this->Interactor->GetKeyCode() ;
switch (ch)
{
case 'n':
this->Level++;
break;
case 'p':
if(this->Level > 1)
{
this->Level--;
}
break ;
default:
std::cout << "An unhandled key was pressed." << std::endl;
break;
}
this->ReDraw();
// forward events
if(ch != 'p') //don't forward the "pick" command
{
vtkInteractorStyleTrackballCamera::OnChar();
}
}
void ReDraw()
{
std::cout << "Level " << this->Level << std::endl;
for(unsigned i = 0; i < 4; i++)
{
vtkSmartPointer<vtkLocator> tree = this->trees[i];
//vtkRenderer* renderer = this->renderers[i];
tree->SetDataSet(data);
tree->BuildLocator();
vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();
std::cout << "Tree " << i << " has " << tree->GetLevel() << " levels." << std::endl;
if(this->Level > tree->GetLevel())
{
tree->GenerateRepresentation(tree->GetLevel(), polydata);
}
else
{
tree->GenerateRepresentation(this->Level, polydata);
}
#if VTK_MAJOR_VERSION <= 5
this->mappers[i]->SetInputConnection(polydata->GetProducerPort());
#else
this->mappers[i]->SetInputData(polydata);
#endif
}
this->Interactor->GetRenderWindow()->Render();
}
private:
int Level;
};
vtkStandardNewMacro(KeyPressInteractorStyle);
int main(int argc, char *argv[])
{
vtkSmartPointer<vtkPolyData> originalMesh =
vtkSmartPointer<vtkPolyData>::New();
if(argc > 1) //If a file name is specified, open and use the file.
{
vtkSmartPointer<vtkXMLPolyDataReader> reader =
vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader->SetFileName(argv[1]);
reader->Update();
originalMesh->ShallowCopy(reader->GetOutput());
}
else //If a file name is not specified, create a sphere
{
//vtkSmartPointer<vtkSphereSource> sphereSource =
//vtkSmartPointer<vtkSphereSource>::New();
vtkSmartPointer<vtkPointSource> sphereSource =
vtkSmartPointer<vtkPointSource>::New();
sphereSource->SetNumberOfPoints(1000);
sphereSource->Update();
originalMesh->ShallowCopy(sphereSource->GetOutput());
}
double numberOfViewports = 4.;
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(200* numberOfViewports,200); //(width, height)
renderWindow->SetWindowName("Multiple ViewPorts");
vtkSmartPointer<KeyPressInteractorStyle> style =
vtkSmartPointer<KeyPressInteractorStyle>::New();
style->data = originalMesh;
vtkSmartPointer<vtkCamera> camera =
vtkSmartPointer<vtkCamera>::New();
for(unsigned int i = 0; i < 4; i++)
{
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(renderer);
style->renderers.push_back(renderer);
renderer->SetViewport(static_cast<double>(i)/numberOfViewports,0,
static_cast<double>(i+1)/numberOfViewports,1);
renderer->SetBackground(.2, .3, .4);
renderer->SetActiveCamera(camera);
}
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderWindowInteractor->SetInteractorStyle(style);
style->Initialize();
style->renderers[0]->ResetCamera();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(DataStructureComparison)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(DataStructureComparison MACOSX_BUNDLE DataStructureComparison.cxx)
target_link_libraries(DataStructureComparison ${VTK_LIBRARIES})
Download and Build DataStructureComparison
Click here to download DataStructureComparison and its CMakeLists.txt file. Once the tarball DataStructureComparison.tar has been downloaded and extracted,
cd DataStructureComparison/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:
./DataStructureComparison
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.