TransformActor
VTKExamples/Cxx/Visualization/TransformActor
Description
This examples demonstrates how to transform an actor. This is different than using vtkTransformPolyDataFilter in that it doesn't actually transform the data (you can't access the transformed coordinates) - it is all done on the video card.
Code
TransformActor.cxx
#include <vtkSmartPointer.h>
#include <vtkConeSource.h>
#include <vtkTransform.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
// Create a cone
vtkSmartPointer<vtkConeSource> coneSource1 =
vtkSmartPointer<vtkConeSource>::New();
coneSource1->Update();
vtkSmartPointer<vtkConeSource> coneSource2 =
vtkSmartPointer<vtkConeSource>::New();
coneSource2->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper1 =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper1->SetInputConnection(coneSource1->GetOutputPort());
vtkSmartPointer<vtkActor> actor1 =
vtkSmartPointer<vtkActor>::New();
actor1->SetMapper(mapper1);
// Create a second, transformed cone
vtkSmartPointer<vtkPolyDataMapper> mapper2 =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper2->SetInputConnection(coneSource2->GetOutputPort());
vtkSmartPointer<vtkActor> actor2 =
vtkSmartPointer<vtkActor>::New();
actor2->SetMapper(mapper2);
vtkSmartPointer<vtkTransform> transform =
vtkSmartPointer<vtkTransform>::New();
transform->PostMultiply(); //this is the key line
transform->RotateZ(90.0);
actor2->SetUserTransform(transform);
// 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(actor1);
renderer->AddActor(actor2);
renderer->SetBackground(1,1,1); // Background color white
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(TransformActor)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(TransformActor MACOSX_BUNDLE TransformActor.cxx)
target_link_libraries(TransformActor ${VTK_LIBRARIES})
Download and Build TransformActor
Click here to download TransformActor and its CMakeLists.txt file. Once the tarball TransformActor.tar has been downloaded and extracted,
cd TransformActor/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:
./TransformActor
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.