VTKExamples/Cxx/Modelling/MarchingCubes
Description
Creates a surface from a volume using Marching Cubes.
Without arguments, the examples generates a voxelized sphere with vtkVoxelModeller. '''NOTE:''' vtkVoxelModeller by default produces a VTK_BIT scalar image. Marching Cubes does not support this type. The scalar output is set to float for this example.
To generate a surface from a DICOM series, provide a folder containing the series and specify an isovalue for the surface.
This Midas Repository contains a number of DICOM datasets.
Code
MarchingCubes.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkMarchingCubes.h>
#include <vtkVoxelModeller.h>
#include <vtkSphereSource.h>
#include <vtkImageData.h>
#include <vtkDICOMImageReader.h>
#include <vtkActor.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
int main(int argc, char *argv[])
{
vtkSmartPointer<vtkImageData> volume =
vtkSmartPointer<vtkImageData>::New();
double isoValue;
if (argc < 3)
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetPhiResolution(20);
sphereSource->SetThetaResolution(20);
sphereSource->Update();
double bounds[6];
sphereSource->GetOutput()->GetBounds(bounds);
for (unsigned int i = 0; i < 6; i += 2)
{
double range = bounds[i+1] - bounds[i];
bounds[i] = bounds[i] - .1 * range;
bounds[i+1] = bounds[i+1] + .1 * range;
}
vtkSmartPointer<vtkVoxelModeller> voxelModeller =
vtkSmartPointer<vtkVoxelModeller>::New();
voxelModeller->SetSampleDimensions(50,50,50);
voxelModeller->SetModelBounds(bounds);
voxelModeller->SetScalarTypeToFloat();
voxelModeller->SetMaximumDistance(.1);
voxelModeller->SetInputConnection(sphereSource->GetOutputPort());
voxelModeller->Update();
isoValue = 0.5;
volume->DeepCopy(voxelModeller->GetOutput());
}
else
{
vtkSmartPointer<vtkDICOMImageReader> reader =
vtkSmartPointer<vtkDICOMImageReader>::New();
reader->SetDirectoryName(argv[1]);
reader->Update();
volume->DeepCopy(reader->GetOutput());
isoValue = atof(argv[2]);
}
vtkSmartPointer<vtkMarchingCubes> surface =
vtkSmartPointer<vtkMarchingCubes>::New();
#if VTK_MAJOR_VERSION <= 5
surface->SetInput(volume);
#else
surface->SetInputData(volume);
#endif
surface->ComputeNormalsOn();
surface->SetValue(0, isoValue);
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->SetBackground(.1, .2, .3);
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(surface->GetOutputPort());
mapper->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
renderer->AddActor(actor);
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(MarchingCubes)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(MarchingCubes MACOSX_BUNDLE MarchingCubes.cxx)
target_link_libraries(MarchingCubes ${VTK_LIBRARIES})
Download and Build MarchingCubes
Click here to download MarchingCubes and its CMakeLists.txt file. Once the tarball MarchingCubes.tar has been downloaded and extracted,
cd MarchingCubes/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:
./MarchingCubes
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.