Difference between revisions of "VTK/Examples/Cxx/Filtering/IterativeClosestPointsTransform"

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<div class="floatright">[[File:VTK_Examples_Baseline_Filtering_TestIterativeClosestPointsTransform.png|300px]]</div>
 
<div class="floatright">[[File:VTK_Examples_Baseline_Filtering_TestIterativeClosestPointsTransform.png|300px]]</div>
  
This demo produces target points which are at the origin and unit length along each axis. It then perturbs the points and shifts each of them .3 in +y direction -
+
This demo produces target points (green) which are at the origin and unit length along each axis. It then perturbs the points and shifts each of them .3 in +y direction -
the resulting points are the "source" points. It then attempts to move the source points as close as possible to the target points. The noise is added to make the example more realistic. Also, the noise ensures nothing was done wrong (i.e. accidentally using the target points as the result and claiming it worked perfectly when in fact nothing happened!)
+
the resulting points are the "source" points (red). It then attempts to move the source points as close as possible to the target points. The resulting points are shown in blue. The noise is added to make the example more realistic. Also, the noise ensures nothing was done wrong (i.e. accidentally using the target points as the result and claiming it worked perfectly when in fact nothing happened!)
  
 
==IterativeClosestPointsTransform.cxx==
 
==IterativeClosestPointsTransform.cxx==

Revision as of 09:15, 8 August 2011

VTK Examples Baseline Filtering TestIterativeClosestPointsTransform.png

This demo produces target points (green) which are at the origin and unit length along each axis. It then perturbs the points and shifts each of them .3 in +y direction - the resulting points are the "source" points (red). It then attempts to move the source points as close as possible to the target points. The resulting points are shown in blue. The noise is added to make the example more realistic. Also, the noise ensures nothing was done wrong (i.e. accidentally using the target points as the result and claiming it worked perfectly when in fact nothing happened!)

IterativeClosestPointsTransform.cxx

#include <vtkSmartPointer.h>
#include <vtkTransform.h>
#include <vtkVertexGlyphFilter.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkCellArray.h>
#include <vtkIterativeClosestPointTransform.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkLandmarkTransform.h>
#include <vtkMath.h>
#include <vtkMatrix4x4.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkProperty.h>

namespace
{
void CreatePolyData(vtkSmartPointer<vtkPolyData> polydata);
void PerturbPolyData(vtkSmartPointer<vtkPolyData> polydata);
void TranslatePolyData(vtkSmartPointer<vtkPolyData> polydata);
}

int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkPolyData> source =
    vtkSmartPointer<vtkPolyData>::New();
  vtkSmartPointer<vtkPolyData> target =
    vtkSmartPointer<vtkPolyData>::New();
    
  if(argc == 3)
    {
    std::cout << "Reading data..." << std::endl;
    std::string strSource = argv[1];
    std::string strTarget = argv[2];
    vtkSmartPointer<vtkXMLPolyDataReader> sourceReader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    sourceReader->SetFileName(strSource.c_str());
    sourceReader->Update();
    source->ShallowCopy(sourceReader->GetOutput());

    vtkSmartPointer<vtkXMLPolyDataReader> targetReader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    targetReader->SetFileName(strTarget.c_str());
    targetReader->Update();
    target->ShallowCopy(targetReader->GetOutput());
    }
  else
    {
    std::cout << "Creating data..." << std::endl;
    CreatePolyData(source);
    target->ShallowCopy(source);
    TranslatePolyData(target);
    PerturbPolyData(target);
    }
  
  // Setup ICP transform
  vtkSmartPointer<vtkIterativeClosestPointTransform> icp = 
      vtkSmartPointer<vtkIterativeClosestPointTransform>::New();
  icp->SetSource(source);
  icp->SetTarget(target);
  icp->GetLandmarkTransform()->SetModeToRigidBody();
  icp->SetMaximumNumberOfIterations(20);
  //icp->StartByMatchingCentroidsOn();
  icp->Modified();
  icp->Update();
  
  // Get the resulting transformation matrix (this matrix takes the source points to the target points)
  vtkSmartPointer<vtkMatrix4x4> m = icp->GetMatrix();
  std::cout << "The resulting matrix is: " << *m << std::endl;
  
  // Transform the source points by the ICP solution
  vtkSmartPointer<vtkTransformPolyDataFilter> icpTransformFilter =
    vtkSmartPointer<vtkTransformPolyDataFilter>::New();
  icpTransformFilter->SetInput(source);
  icpTransformFilter->SetTransform(icp);
  icpTransformFilter->Update();

  /*
  // If you need to take the target points to the source points, the matrix is:
  icp->Inverse();
  vtkSmartPointer<vtkMatrix4x4> minv = icp->GetMatrix();
  std::cout << "The resulting inverse matrix is: " << *minv << std::cout;
  */
  
  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> sourceMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  sourceMapper->SetInputConnection(source->GetProducerPort());

  vtkSmartPointer<vtkActor> sourceActor =
    vtkSmartPointer<vtkActor>::New();
  sourceActor->SetMapper(sourceMapper);
  sourceActor->GetProperty()->SetColor(1,0,0);
  sourceActor->GetProperty()->SetPointSize(4);

  vtkSmartPointer<vtkPolyDataMapper> targetMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  targetMapper->SetInputConnection(target->GetProducerPort());
  
  vtkSmartPointer<vtkActor> targetActor =
    vtkSmartPointer<vtkActor>::New();
  targetActor->SetMapper(targetMapper);
  targetActor->GetProperty()->SetColor(0,1,0);
  targetActor->GetProperty()->SetPointSize(4);
  
  vtkSmartPointer<vtkPolyDataMapper> solutionMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  solutionMapper->SetInputConnection(icpTransformFilter->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;
}

namespace // anonymous
{

void CreatePolyData(vtkSmartPointer<vtkPolyData> polydata)
{
  // This function creates a set of 4 points (the origin and a point unit distance along each axis)
  
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  
  // Create points
  double origin[3] = {0.0, 0.0, 0.0};
  points->InsertNextPoint(origin);
  double p1[3] = {1.0, 0.0, 0.0};
  points->InsertNextPoint(p1);
  double p2[3] = {0.0, 1.0, 0.0};
  points->InsertNextPoint(p2);
  double p3[3] = {0.0, 0.0, 1.0};
  points->InsertNextPoint(p3);
    
  vtkSmartPointer<vtkPolyData> temp = 
    vtkSmartPointer<vtkPolyData>::New();
  temp->SetPoints(points);
  
  vtkSmartPointer<vtkVertexGlyphFilter> vertexFilter = 
    vtkSmartPointer<vtkVertexGlyphFilter>::New();
  vertexFilter->SetInputConnection(temp->GetProducerPort());
  vertexFilter->Update();

  polydata->ShallowCopy(vertexFilter->GetOutput());
}

void PerturbPolyData(vtkSmartPointer<vtkPolyData> polydata)
{
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->ShallowCopy(polydata->GetPoints());

  for(unsigned int i = 0; i < points->GetNumberOfPoints(); i++)
    {
    double p[3];
    points->GetPoint(i, p);
    double perturb[3];
    if(i%3 == 0)
      {
      perturb[0] = .1; perturb[1] = 0; perturb[2] = 0;
      }
    else if(i%3 == 1)
      {
      perturb[0] = 0; perturb[1] = .1; perturb[2] = 0;
      }
    else
      {
      perturb[0] = 0; perturb[1] = 0; perturb[2] = .1;
      }
      
    for(unsigned int j = 0; j < 3; j++)
      {
      p[j] += perturb[j];
      }
    points->SetPoint(i, p);
    }

  polydata->SetPoints(points);

}

void TranslatePolyData(vtkSmartPointer<vtkPolyData> polydata)
{
  vtkSmartPointer<vtkTransform> transform =
    vtkSmartPointer<vtkTransform>::New();
  transform->Translate(0,.3,0);

  vtkSmartPointer<vtkTransformPolyDataFilter> transformFilter =
    vtkSmartPointer<vtkTransformPolyDataFilter>::New();
  transformFilter->SetInputConnection(polydata->GetProducerPort());
  transformFilter->SetTransform(transform);
  transformFilter->Update();
  
  polydata->ShallowCopy(transformFilter->GetOutput());
}

} // end anonymous namespace

CMakeLists.txt

PROJECT(ICP)
CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
 
FIND_PACKAGE(VTK REQUIRED)
INCLUDE(${VTK_USE_FILE})
 
ADD_EXECUTABLE(ICP ICP.cxx)
TARGET_LINK_LIBRARIES(ICP vtkHybrid)