VTK/Examples/Cxx/Filtering/LandmarkTransform

#include <vtkVersion.h>
#include <vtkPoints.h>
#include <vtkSmartPointer.h>
#include <vtkLandmarkTransform.h>
#include <vtkMatrix4x4.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkVertexGlyphFilter.h>
 
int main(int, char *[])
{
  /*
  This demo creates a coordinate frame (+x, +y, +z) of vectors and a rotated,
  peturbed frame (+z, +y, -x) and aligns the rotated frame to the original as best as possible.
  */
 
  vtkSmartPointer<vtkPoints> sourcePoints =
    vtkSmartPointer<vtkPoints>::New();
  double sourcePoint1[3] = {1.0, 0.0, 0.0};
  sourcePoints->InsertNextPoint(sourcePoint1);
  double sourcePoint2[3] = {0.0, 1.0, 0.0};
  sourcePoints->InsertNextPoint(sourcePoint2);
  double sourcePoint3[3] = {0.0, 0.0, 1.0};
  sourcePoints->InsertNextPoint(sourcePoint3);
 
  vtkSmartPointer<vtkPoints> targetPoints =
    vtkSmartPointer<vtkPoints>::New();
  double targetPoint1[3] = {0.0, 0.0, 1.1};
  targetPoints->InsertNextPoint(targetPoint1);
  double targetPoint2[3] = {0.0, 1.02, 0.0};
  targetPoints->InsertNextPoint(targetPoint2);
  double targetPoint3[3] = {-1.11, 0.0, 0.0};
  targetPoints->InsertNextPoint(targetPoint3);
 
  // Setup the transform
  vtkSmartPointer<vtkLandmarkTransform> landmarkTransform = 
    vtkSmartPointer<vtkLandmarkTransform>::New();
  landmarkTransform->SetSourceLandmarks(sourcePoints);
  landmarkTransform->SetTargetLandmarks(targetPoints);
  landmarkTransform->SetModeToRigidBody();
  landmarkTransform->Update(); //should this be here?
 
  vtkSmartPointer<vtkPolyData> source =
    vtkSmartPointer<vtkPolyData>::New();
  source->SetPoints(sourcePoints);
 
  vtkSmartPointer<vtkPolyData> target =
    vtkSmartPointer<vtkPolyData>::New();
  target->SetPoints(targetPoints);
 
  vtkSmartPointer<vtkVertexGlyphFilter> sourceGlyphFilter =
    vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
  sourceGlyphFilter->SetInputConnection(source->GetProducerPort());
#else
  sourceGlyphFilter->SetInputData(source);
#endif
  sourceGlyphFilter->Update();
 
  vtkSmartPointer<vtkVertexGlyphFilter> targetGlyphFilter =
    vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
  targetGlyphFilter->SetInputConnection(target->GetProducerPort());
#else
  targetGlyphFilter->SetInputData(target);
#endif
  targetGlyphFilter->Update();
 
  vtkSmartPointer<vtkTransformPolyDataFilter> transformFilter =
    vtkSmartPointer<vtkTransformPolyDataFilter>::New();
  transformFilter->SetInputConnection(sourceGlyphFilter->GetOutputPort());
  transformFilter->SetTransform(landmarkTransform);
  transformFilter->Update();
 
  // Display the transformation matrix that was computed
  vtkMatrix4x4* mat = landmarkTransform->GetMatrix();
  std::cout << "Matrix: " << *mat << std::endl;
 
  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> sourceMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  sourceMapper->SetInputConnection(sourceGlyphFilter->GetOutputPort());
 
  vtkSmartPointer<vtkActor> sourceActor =
    vtkSmartPointer<vtkActor>::New();
  sourceActor->SetMapper(sourceMapper);
  sourceActor->GetProperty()->SetColor(0,1,0);
  sourceActor->GetProperty()->SetPointSize(4);
 
  vtkSmartPointer<vtkPolyDataMapper> targetMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  targetMapper->SetInputConnection(targetGlyphFilter->GetOutputPort());
 
  vtkSmartPointer<vtkActor> targetActor =
    vtkSmartPointer<vtkActor>::New();
  targetActor->SetMapper(targetMapper);
  targetActor->GetProperty()->SetColor(1,0,0);
  targetActor->GetProperty()->SetPointSize(4);
 
  vtkSmartPointer<vtkPolyDataMapper> solutionMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  solutionMapper->SetInputConnection(transformFilter->GetOutputPort());
 
  vtkSmartPointer<vtkActor> solutionActor =
    vtkSmartPointer<vtkActor>::New();
  solutionActor->SetMapper(solutionMapper);
  solutionActor->GetProperty()->SetColor(0,0,1);
  solutionActor->GetProperty()->SetPointSize(3);
 
  // 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(sourceActor);
  renderer->AddActor(targetActor);
  renderer->AddActor(solutionActor);
  renderer->SetBackground(.3, .6, .3); // Background color green
 
  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}