SampleFunction
VTKExamples/Cxx/ImplicitFunctions/SampleFunction
Code¶
SampleFunction.cxx
#include <vtkSmartPointer.h> #include <vtkSampleFunction.h> #include <vtkContourFilter.h> #include <vtkOutlineFilter.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkImageData.h> #include <vtkSphere.h> int main (int, char *[]) { vtkSmartPointer<vtkSphere> sphere = vtkSmartPointer<vtkSphere>::New(); // Sample the function vtkSmartPointer<vtkSampleFunction> sample = vtkSmartPointer<vtkSampleFunction>::New(); sample->SetSampleDimensions(50,50,50); sample->SetImplicitFunction(sphere); double value = 2.0; double xmin = -value, xmax = value, ymin = -value, ymax = value, zmin = -value, zmax = value; sample->SetModelBounds(xmin, xmax, ymin, ymax, zmin, zmax); // Create the 0 isosurface vtkSmartPointer<vtkContourFilter> contours = vtkSmartPointer<vtkContourFilter>::New(); contours->SetInputConnection(sample->GetOutputPort()); contours->GenerateValues(1, 1, 1); // Map the contours to graphical primitives vtkSmartPointer<vtkPolyDataMapper> contourMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); contourMapper->SetInputConnection(contours->GetOutputPort()); contourMapper->SetScalarRange(0.0, 1.2); // Create an actor for the contours vtkSmartPointer<vtkActor> contourActor = vtkSmartPointer<vtkActor>::New(); contourActor->SetMapper(contourMapper); // -- create a box around the function to indicate the sampling volume -- // Create outline vtkSmartPointer<vtkOutlineFilter> outline = vtkSmartPointer<vtkOutlineFilter>::New(); outline->SetInputConnection(sample->GetOutputPort()); // Map it to graphics primitives vtkSmartPointer<vtkPolyDataMapper> outlineMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); outlineMapper->SetInputConnection(outline->GetOutputPort()); // Create an actor for it vtkSmartPointer<vtkActor> outlineActor = vtkSmartPointer<vtkActor>::New(); outlineActor->SetMapper(outlineMapper); outlineActor->GetProperty()->SetColor(0,0,0); // Visualize vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); renderer->AddActor(contourActor); renderer->AddActor(outlineActor); renderer->SetBackground(1,1,1); // Background color white renderWindow->Render(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(SampleFunction) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(SampleFunction MACOSX_BUNDLE SampleFunction.cxx) target_link_libraries(SampleFunction ${VTK_LIBRARIES})
Download and Build SampleFunction¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download SampleFunction and its CMakeLists.txt file. Once the tarball SampleFunction.tar has been downloaded and extracted,
cd SampleFunction/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:
./SampleFunction
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.