DensifyPoints
VTKEx/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
Warning
This example requires vtk 7.1 or greater.
Question
If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum
Code¶
DensifyPoints.cxx
#include <vtkSmartPointer.h>
#include <vtkDensifyPointCloudFilter.h>
#include <vtkBYUReader.h>
#include <vtkOBJReader.h>
#include <vtkPLYReader.h>
#include <vtkPolyDataReader.h>
#include <vtkSTLReader.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkPointSource.h>
#include <vtkSphereSource.h>
#include <vtkGlyph3DMapper.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
#include <vtkNamedColors.h>
#include <vtksys/SystemTools.hxx>
namespace
{
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;
double maxRange = std::max(std::max(range[0], range[1]), range[2]);
std::cout << "# of original points: " << polyData->GetNumberOfPoints() << std::endl;
vtkSmartPointer<vtkDensifyPointCloudFilter> densify =
vtkSmartPointer<vtkDensifyPointCloudFilter>::New();
densify->SetInputData(polyData);
densify->SetMaximumNumberOfIterations(5);
densify->SetTargetDistance(maxRange * .03);
densify->SetNumberOfClosestPoints(10);
densify->Update();
std::cout << "# of densified points: " << densify->GetOutput()->GetNumberOfPoints() << std::endl;
vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();
///
double radius = maxRange * .01;
vtkSmartPointer<vtkSphereSource> sphereSource1 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource1->SetRadius(radius);
vtkSmartPointer<vtkGlyph3DMapper> glyph3D1 =
vtkSmartPointer<vtkGlyph3DMapper>::New();
glyph3D1->SetInputData(polyData);
glyph3D1->SetSourceConnection(sphereSource1->GetOutputPort());
glyph3D1->ScalarVisibilityOff();
glyph3D1->ScalingOff();
vtkSmartPointer<vtkActor> glyph3DActor1 =
vtkSmartPointer<vtkActor>::New();
glyph3DActor1->SetMapper(glyph3D1);
glyph3DActor1->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
////
vtkSmartPointer<vtkSphereSource> sphereSource2 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource2->SetRadius(radius * .75);
vtkSmartPointer<vtkGlyph3DMapper> glyph3D2 =
vtkSmartPointer<vtkGlyph3DMapper>::New();
glyph3D2->SetInputConnection(densify->GetOutputPort());
glyph3D2->SetSourceConnection(sphereSource2->GetOutputPort());
glyph3D2->ScalarVisibilityOff();
glyph3D2->ScalingOff();
vtkSmartPointer<vtkActor> glyph3DActor2 =
vtkSmartPointer<vtkActor>::New();
glyph3DActor2->SetMapper(glyph3D2);
glyph3DActor2->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
// Create graphics stuff
//
vtkSmartPointer<vtkRenderer> ren1 =
vtkSmartPointer<vtkRenderer>::New();
ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
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();
renWin->Render();
iren->Initialize();
iren->Start();
return EXIT_SUCCESS;
}
namespace
{
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 == ".vtk")
{
vtkSmartPointer<vtkPolyDataReader> reader =
vtkSmartPointer<vtkPolyDataReader>::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 if (extension == ".g")
{
vtkSmartPointer<vtkBYUReader> reader =
vtkSmartPointer<vtkBYUReader>::New();
reader->SetGeometryFileName (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 3.3 FATAL_ERROR)
project(DensifyPoints)
find_package(VTK COMPONENTS
vtkvtkCommonColor
vtkvtkCommonCore
vtkvtkFiltersPoints
vtkvtkFiltersSources
vtkvtkIOGeometry
vtkvtkIOLegacy
vtkvtkIOPLY
vtkvtkIOXML
vtkvtkInteractionStyle
vtkvtkRenderingContextOpenGL2
vtkvtkRenderingCore
vtkvtkRenderingFreeType
vtkvtkRenderingGL2PSOpenGL2
vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping DensifyPoints: ${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(DensifyPoints MACOSX_BUNDLE DensifyPoints.cxx )
target_link_libraries(DensifyPoints PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(DensifyPoints MACOSX_BUNDLE DensifyPoints.cxx )
target_link_libraries(DensifyPoints PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS DensifyPoints
MODULES ${VTK_LIBRARIES}
)
endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.