TransformOrderDemo
VTKExamples/Cxx/PolyData/TransformOrderDemo
Description¶
This example creates an image. In the left viewport, it translates the image, then translates and rotates the image. In the right viewport, it rotates the image, then rotates and translates the image. One can see that the result is clearly not the same!
Code¶
TransformOrderDemo.cxx
#include <vtkSmartPointer.h> #include <vtkTransform.h> #include <vtkAxesActor.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkImageMandelbrotSource.h> #include <vtkImageActor.h> #include <vtkImageMapper3D.h> #include <vtkImageCast.h> int main(int, char *[]) { // Create an image vtkSmartPointer<vtkImageMandelbrotSource> source = vtkSmartPointer<vtkImageMandelbrotSource>::New(); source->Update(); vtkSmartPointer<vtkImageCast> castFilter = vtkSmartPointer<vtkImageCast>::New(); castFilter->SetInputConnection(source->GetOutputPort()); castFilter->SetOutputScalarTypeToUnsignedChar(); castFilter->Update(); // Create an actor vtkSmartPointer<vtkImageActor> actor1a = vtkSmartPointer<vtkImageActor>::New(); actor1a->GetMapper()->SetInputConnection(castFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> actor1b = vtkSmartPointer<vtkImageActor>::New(); actor1b->GetMapper()->SetInputConnection(castFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> actor2a = vtkSmartPointer<vtkImageActor>::New(); actor2a->GetMapper()->SetInputConnection(castFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> actor2b = vtkSmartPointer<vtkImageActor>::New(); actor2b->GetMapper()->SetInputConnection(castFilter->GetOutputPort()); // Create the transformation vtkSmartPointer<vtkTransform> transform1a = vtkSmartPointer<vtkTransform>::New(); transform1a->PostMultiply(); transform1a->Translate(10.0, 0.0, 0.0); actor1a->SetUserTransform(transform1a); vtkSmartPointer<vtkTransform> transform1b = vtkSmartPointer<vtkTransform>::New(); transform1b->PostMultiply(); transform1b->Translate(10.0, 0.0, 0.0); transform1b->RotateZ(40.0); actor1b->SetUserTransform(transform1b); vtkSmartPointer<vtkTransform> transform2a = vtkSmartPointer<vtkTransform>::New(); transform2a->PostMultiply(); transform2a->RotateZ(40.0); actor2a->SetUserTransform(transform2a); vtkSmartPointer<vtkTransform> transform2b = vtkSmartPointer<vtkTransform>::New(); transform2b->PostMultiply(); transform2b->RotateZ(40.0); transform2b->Translate(10.0, 0.0, 0.0); actor2b->SetUserTransform(transform2b); // Define viewport ranges // (xmin, ymin, xmax, ymax) double leftViewport[4] = {0.0, 0.0, 0.5, 1.0}; double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Cetup render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); // Setup both renderers vtkSmartPointer<vtkRenderer> leftRenderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(leftRenderer); leftRenderer->SetViewport(leftViewport); leftRenderer->SetBackground(.6, .5, .4); vtkSmartPointer<vtkRenderer> rightRenderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(rightRenderer); rightRenderer->SetViewport(rightViewport); rightRenderer->SetBackground(.4, .5, .6); // an interactor vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkAxesActor> axes = vtkSmartPointer<vtkAxesActor>::New(); axes->AxisLabelsOff(); axes->SetTotalLength(5,5,5); leftRenderer->AddActor(axes); leftRenderer->AddActor(actor1a); leftRenderer->AddActor(actor1b); rightRenderer->AddActor(axes); rightRenderer->AddActor(actor2a); rightRenderer->AddActor(actor2b); leftRenderer->ResetCamera(); rightRenderer->ResetCamera(); renderWindow->Render(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(TransformOrderDemo) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(TransformOrderDemo MACOSX_BUNDLE TransformOrderDemo.cxx) target_link_libraries(TransformOrderDemo ${VTK_LIBRARIES})
Download and Build TransformOrderDemo¶
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 TransformOrderDemo and its CMakeLists.txt file. Once the tarball TransformOrderDemo.tar has been downloaded and extracted,
cd TransformOrderDemo/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:
./TransformOrderDemo
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.