DensifyPoints
VTKExamples/Cxx/Points/DensifyPoints
Description
In this example, the original points are yellow and the added points are red.
The image was produced using this torso dataset
Code
DensifyPoints.cxx
#include <vtkSmartPointer.h>
#include <vtkDensifyPointCloudFilter.h>
#include <vtkPLYReader.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkOBJReader.h>
#include <vtkSTLReader.h>
#include <vtkPointSource.h>
#include <vtkSphereSource.h>
#include <vtkGlyph3D.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
#include <vtksys/SystemTools.hxx>
static vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName);
int main (int argc, char *argv[])
{
vtkSmartPointer<vtkPolyData> polyData = ReadPolyData(argc > 1 ? argv[1] : "");;
double bounds[6];
polyData->GetBounds(bounds);
double range[3];
for (int i = 0; i < 3; ++i)
{
range[i] = bounds[2*i + 1] - bounds[2*i];
}
std::cout << "Range: "
<< range[0] << ", "
<< range[1] << ", "
<< range[2] << std::endl;
std::cout << "# of original points: " << polyData->GetNumberOfPoints() << std::endl;
vtkSmartPointer<vtkDensifyPointCloudFilter> densify =
vtkSmartPointer<vtkDensifyPointCloudFilter>::New();
densify->SetInputData(polyData);
densify->SetMaximumNumberOfIterations(5);
densify->SetTargetDistance(range[0] * .03);
densify->SetNumberOfClosestPoints(10);
densify->Update();
std::cout << "# of densified points: " << densify->GetOutput()->GetNumberOfPoints() << std::endl;
///
double radius = range[0] * .01;
vtkSmartPointer<vtkSphereSource> sphereSource1 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource1->SetRadius(radius);
vtkSmartPointer<vtkGlyph3D> glyph3D1 =
vtkSmartPointer<vtkGlyph3D>::New();
glyph3D1->SetInputData(polyData);
glyph3D1->SetSourceConnection(sphereSource1->GetOutputPort());
glyph3D1->ScalingOff();
glyph3D1->Update();
vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper1 =
vtkSmartPointer<vtkPolyDataMapper>::New();
glyph3DMapper1->SetInputConnection(glyph3D1->GetOutputPort());
glyph3DMapper1->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> glyph3DActor1 =
vtkSmartPointer<vtkActor>::New();
glyph3DActor1->SetMapper(glyph3DMapper1);
glyph3DActor1->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);
////
vtkSmartPointer<vtkSphereSource> sphereSource2 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource2->SetRadius(radius * .75);
vtkSmartPointer<vtkGlyph3D> glyph3D2 =
vtkSmartPointer<vtkGlyph3D>::New();
glyph3D2->SetInputConnection(densify->GetOutputPort());
glyph3D2->SetSourceConnection(sphereSource2->GetOutputPort());
glyph3D2->ScalingOff();
glyph3D2->Update();
vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper2 =
vtkSmartPointer<vtkPolyDataMapper>::New();
glyph3DMapper2->SetInputConnection(glyph3D2->GetOutputPort());
glyph3DMapper2->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> glyph3DActor2 =
vtkSmartPointer<vtkActor>::New();
glyph3DActor2->SetMapper(glyph3DMapper2);
glyph3DActor2->GetProperty()->SetColor(1.0000, 0.4900, 0.2500);
// Create graphics stuff
//
vtkSmartPointer<vtkRenderer> ren1 =
vtkSmartPointer<vtkRenderer>::New();
ren1->SetBackground(.3, .4, .6);
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
renWin->AddRenderer(ren1);
renWin->SetSize(512,512);
vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
iren->SetRenderWindow(renWin);
// Add the actors to the renderer, set the background and size
//
ren1->AddActor(glyph3DActor1);
ren1->AddActor(glyph3DActor2);
// Generate an interesting view
//
ren1->GetActiveCamera()->SetPosition (1, 0, 0);
ren1->GetActiveCamera()->SetFocalPoint (0, 1, 0);
ren1->GetActiveCamera()->SetViewUp (0, 0, 1);
ren1->ResetCamera();
ren1->GetActiveCamera()->Dolly(1.0);
ren1->ResetCameraClippingRange();
iren->Initialize();
iren->Start();
return EXIT_SUCCESS;
}
static vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName)
{
vtkSmartPointer<vtkPolyData> polyData;
std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
if (extension == ".ply")
{
vtkSmartPointer<vtkPLYReader> reader =
vtkSmartPointer<vtkPLYReader>::New();
reader->SetFileName (fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".vtp")
{
vtkSmartPointer<vtkXMLPolyDataReader> reader =
vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader->SetFileName (fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".obj")
{
vtkSmartPointer<vtkOBJReader> reader =
vtkSmartPointer<vtkOBJReader>::New();
reader->SetFileName (fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".stl")
{
vtkSmartPointer<vtkSTLReader> reader =
vtkSmartPointer<vtkSTLReader>::New();
reader->SetFileName (fileName);
reader->Update();
polyData = reader->GetOutput();
}
else
{
vtkSmartPointer<vtkPointSource> points =
vtkSmartPointer<vtkPointSource>::New();
points->SetNumberOfPoints(100000);
points->SetRadius(10.0);
points->SetCenter(vtkMath::Random(-100, 100),
vtkMath::Random(-100, 100),
vtkMath::Random(-100, 100));
points->SetDistributionToShell();
points->Update();
polyData = points->GetOutput();
}
return polyData;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(DensifyPoints)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(DensifyPoints MACOSX_BUNDLE DensifyPoints.cxx)
target_link_libraries(DensifyPoints ${VTK_LIBRARIES})
Download and Build DensifyPoints
Click here to download DensifyPoints and its CMakeLists.txt file. Once the tarball DensifyPoints.tar has been downloaded and extracted,
cd DensifyPoints/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:
./DensifyPoints
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.