TransformPolyData
VTKExamples/Cxx/Filtering/TransformPolyData
Description
This example demonstrates how to apply a transform to a data set. It uses vtkTransformPolyDataFilter, but it can be replaced with vtkTransformFilter for different types of data sets, including vtkUnstructuredGrid and vtkStructuredGrid. vtkTransformFilter will work with vtkPolyData, too).
Code
TransformPolyData.cxx
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkTransform.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
// Create the polydata geometry
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
// Set up the actor to display the untransformed polydata
vtkSmartPointer<vtkPolyDataMapper> originalMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
originalMapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> originalActor =
vtkSmartPointer<vtkActor>::New();
originalActor->SetMapper(originalMapper);
originalActor->GetProperty()->SetColor(1,0,0);
// Set up the transform filter
vtkSmartPointer<vtkTransform> translation =
vtkSmartPointer<vtkTransform>::New();
translation->Translate(1.0, 2.0, 3.0);
vtkSmartPointer<vtkTransformPolyDataFilter> transformFilter =
vtkSmartPointer<vtkTransformPolyDataFilter>::New();
transformFilter->SetInputConnection(sphereSource->GetOutputPort());
transformFilter->SetTransform(translation);
transformFilter->Update();
// Set up the actor to display the transformed polydata
vtkSmartPointer<vtkPolyDataMapper> transformedMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
transformedMapper->SetInputConnection(transformFilter->GetOutputPort());
vtkSmartPointer<vtkActor> transformedActor =
vtkSmartPointer<vtkActor>::New();
transformedActor->SetMapper(transformedMapper);
transformedActor->GetProperty()->SetColor(0,1,0);
// Set up the rest of the visualization pipeline
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(originalActor);
renderer->AddActor(transformedActor);
renderer->SetBackground(.3, .6, .3); // Set renderer's background color to green
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(TransformPolyData)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(TransformPolyData MACOSX_BUNDLE TransformPolyData.cxx)
target_link_libraries(TransformPolyData ${VTK_LIBRARIES})
Download and Build TransformPolyData
Click here to download TransformPolyData and its CMakeLists.txt file. Once the tarball TransformPolyData.tar has been downloaded and extracted,
cd TransformPolyData/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:
./TransformPolyData
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.