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
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.