ExtractSurface
VTKEx/Cxx/Points/ExtractSurface
Description¶
This example loosely follows the most excellent paper by Curless and Levoy: "A Volumetric Method for Building Complex Models from Range Images." First it estimates normals from the points, then creates a signed distance field, followed by surface extraction of the zero-level set of the distance field.
If the example is run without an argument, the example uses random points on a spherical shell. With a filename, the example uses the points on the vtkPolyData.
The image was created using the Armadillo dataset
Info
CompareExtractSurface compares three surface extraction algorithms.
Seealso
PowercrustExtractSurface reconstructs surfaces and is implemented as a VTK remote module. PoissonExtractSurface reconstructs surfaces and is implemented as a VTK remote module.
Warning
If you experience extraneous lines in the reconstruction, update your VTK. A patch was made on September 5, 2017 to correct the issue.
Warning
The classes used in this example require vtk 7.1 or later.
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¶
ExtractSurface.cxx
#include <vtkSmartPointer.h>
#include <vtkBYUReader.h>
#include <vtkPLYReader.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkPolyDataReader.h>
#include <vtkOBJReader.h>
#include <vtkSTLReader.h>
#include <vtkPointSource.h>
#include <vtkPCANormalEstimation.h>
#include <vtkSignedDistance.h>
#include <vtkExtractSurface.h>
#include <vtkPointData.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] : "");;
std::cout << "# of points: " << polyData->GetNumberOfPoints() << std::endl;
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];
}
int sampleSize = polyData->GetNumberOfPoints() * .00005;
if (sampleSize < 10)
{
sampleSize = 10;
}
std::cout << "Sample size is: " << sampleSize << std::endl;
// Do we need to estimate normals?
vtkSmartPointer<vtkSignedDistance> distance =
vtkSmartPointer<vtkSignedDistance>::New();
if (polyData->GetPointData()->GetNormals())
{
std::cout << "Using normals from input file" << std::endl;
distance->SetInputData (polyData);
}
else
{
std::cout << "Estimating normals using PCANormalEstimation" << std::endl;
vtkSmartPointer<vtkPCANormalEstimation> normals =
vtkSmartPointer<vtkPCANormalEstimation>::New();
normals->SetInputData (polyData);
normals->SetSampleSize(sampleSize);
normals->SetNormalOrientationToGraphTraversal();
normals->FlipNormalsOn();
distance->SetInputConnection (normals->GetOutputPort());
}
std::cout << "Range: "
<< range[0] << ", "
<< range[1] << ", "
<< range[2] << std::endl;
int dimension = 256;
double radius;
radius = std::max(std::max(range[0], range[1]), range[2])
/ static_cast<double>(dimension) * 4; // ~4 voxels
std::cout << "Radius: " << radius << std::endl;
distance->SetRadius(radius);
distance->SetDimensions(dimension, dimension, dimension);
distance->SetBounds(
bounds[0] - range[0] * .1,
bounds[1] + range[0] * .1,
bounds[2] - range[1] * .1,
bounds[3] + range[1] * .1,
bounds[4] - range[2] * .1,
bounds[5] + range[2] * .1);
vtkSmartPointer<vtkExtractSurface> surface =
vtkSmartPointer<vtkExtractSurface>::New();
surface->SetInputConnection (distance->GetOutputPort());
surface->SetRadius(radius * .99);
surface->Update();
vtkSmartPointer<vtkPolyDataMapper> surfaceMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
surfaceMapper->SetInputConnection(surface->GetOutputPort());
vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();
vtkSmartPointer<vtkProperty> back =
vtkSmartPointer<vtkProperty>::New();
back->SetColor(colors->GetColor3d("banana").GetData());
vtkSmartPointer<vtkActor> surfaceActor =
vtkSmartPointer<vtkActor>::New();
surfaceActor->SetMapper(surfaceMapper);
surfaceActor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
surfaceActor->SetBackfaceProperty(back);
// 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(surfaceActor);
// Generate an interesting view
//
ren1->ResetCamera();
ren1->GetActiveCamera()->Azimuth(120);
ren1->GetActiveCamera()->Elevation(30);
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(1000);
points->SetRadius(1.0);
points->SetCenter(vtkMath::Random(-1, 1),
vtkMath::Random(-1, 1),
vtkMath::Random(-1, 1));
points->SetDistributionToShell();
points->Update();
polyData = points->GetOutput();
}
return polyData;
}
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(ExtractSurface)
find_package(VTK COMPONENTS
vtkvtkCommonColor
vtkvtkCommonCore
vtkvtkCommonDataModel
vtkvtkFiltersPoints
vtkvtkFiltersSources
vtkvtkIOGeometry
vtkvtkIOLegacy
vtkvtkIOPLY
vtkvtkIOXML
vtkvtkInteractionStyle
vtkvtkRenderingContextOpenGL2
vtkvtkRenderingCore
vtkvtkRenderingFreeType
vtkvtkRenderingGL2PSOpenGL2
vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping ExtractSurface: ${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(ExtractSurface MACOSX_BUNDLE ExtractSurface.cxx )
target_link_libraries(ExtractSurface PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(ExtractSurface MACOSX_BUNDLE ExtractSurface.cxx )
target_link_libraries(ExtractSurface PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS ExtractSurface
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build ExtractSurface¶
Click here to download ExtractSurface and its CMakeLists.txt file. Once the tarball ExtractSurface.tar has been downloaded and extracted,
cd ExtractSurface/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:
./ExtractSurface
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.