ProgrammableFilter
VTKExamples/Cxx/Filtering/ProgrammableFilter
Code
ProgrammableFilter.cxx
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkProgrammableFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
struct params
{
vtkPolyData* data;
vtkProgrammableFilter* filter;
};
void AdjustPoints(void* arguments)
{
params* input = static_cast<params*>(arguments);
vtkPoints* inPts = input->data->GetPoints();
vtkIdType numPts = inPts->GetNumberOfPoints();
vtkSmartPointer<vtkPoints> newPts =
vtkSmartPointer<vtkPoints>::New();
newPts->SetNumberOfPoints(numPts);
for(vtkIdType i = 0; i < numPts/2; i++)
{
double p[3];
inPts->GetPoint(i, p);
p[0] = p[0] + .5;
p[1] = p[1] + .5;
p[2] = p[2] + .5;
newPts->SetPoint(i, p);
}
for(vtkIdType i = numPts/2; i < numPts; i++)
{
double p[3];
inPts->GetPoint(i, p);
p[0] = p[0] - .5;
p[1] = p[1] - .5;
p[2] = p[2] - .5;
newPts->SetPoint(i, p);
}
input->filter->GetPolyDataOutput()->CopyStructure(input->data);
input->filter->GetPolyDataOutput()->SetPoints(newPts);
}
int main(int, char *[])
{
//Create a sphere
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkProgrammableFilter> programmableFilter =
vtkSmartPointer<vtkProgrammableFilter>::New();
programmableFilter->SetInputConnection(sphereSource->GetOutputPort());
params myParams;
myParams.data = sphereSource->GetOutput();
myParams.filter = programmableFilter;
programmableFilter->SetExecuteMethod(AdjustPoints, &myParams);
programmableFilter->Update();
//Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(programmableFilter->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
//Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
//Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(.4, .5, .6); // Background color white
//Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ProgrammableFilter)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ProgrammableFilter MACOSX_BUNDLE ProgrammableFilter.cxx)
target_link_libraries(ProgrammableFilter ${VTK_LIBRARIES})
Download and Build ProgrammableFilter
Click here to download ProgrammableFilter and its CMakeLists.txt file. Once the tarball ProgrammableFilter.tar has been downloaded and extracted,
cd ProgrammableFilter/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:
./ProgrammableFilter
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.