VTK


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Project configuration on VC++2005

Include path: (somewhere)\VTK5.0.4\include\vtk-5.0
Library path: (somewhere)\VTK5.0.4\lib
Library files: vtkCommon.lib vtkIO.lib vtkDICOMParser.lib vtkexoIIc.lib vtkexpat.lib vtkFiltering.lib vtkfreetype.lib vtkftgl.lib vtkGenericFiltering.lib vtkGraphics.lib vtkHybrid.lib vtkImaging.lib vtkjpeg.lib vtkNetCDF.lib vtkpng.lib vtkRendering.lib vtksys.lib vtktiff.lib vtkVolumeRendering.lib vtkWidgets.lib vtkzlib.lib

In order to go debug into VTK source codes, you have to change the library path like following:
Library path: (somewhere)\vtk-5.0.4_bin\bin\debug

Tips

Show debug message

 vtkUnstructuredGridReader *polyDataReader = vtkUnstructuredGridReader::New();
 polyDataReader->DebugOn();

Read all scalar and vector data

VTK with default setting loads only one data.
 polyDataReader->ReadAllScalarsOn();
 polyDataReader->ReadAllVectorsOn();

Get number of points and number of cells

 int num_points = polyData->GetPoints()->GetNumberOfPoints();
 int num_celss = polyData->GetNumberOfCells();

Get array of scalar and vector data

 vtkPointData *pd = polyData->GetPointData();
 vtkDataArray *arrP = pd->GetScalars("PRESSURE1");
 vtkDataArray *arrV = pd->GetVectors("velocity");

Calculate distance between two point

 double point1[3] = {0,0,0}, point2[3] = {100,0,0};
 double d = vtkMath::Distance2BetweenPoints(point1, point2);
 d = sqrt(d);


Example1: Visualization with VTK

// vtk_test.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
// first include the required header files for the vtk classes we are using
#include "vtkConeSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkCamera.h"
 
 
int _tmain(int argc, _TCHAR* argv[])
{
  //
  // Next we create an instance of vtkConeSource and set some of its 
  // properties
  //
  vtkConeSource *cone = vtkConeSource::New();
  cone->SetHeight( 3.0 );
  cone->SetRadius( 1.0 );
  cone->SetResolution( 10 );
 
  //
  // We create an instance of vtkPolyDataMapper to map the polygonal data 
  // into graphics primitives. We connect the output of the cone souece 
  // to the input of this mapper 
  //
  vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
  coneMapper->SetInput( cone->GetOutput() );
 
  //
  // create an actor to represent the cone. The actor coordinates rendering of
  // the graphics primitives for a mapper. We set this actor's mapper to be
  // coneMapper which we created above.
  //
  vtkActor *coneActor = vtkActor::New();
  coneActor->SetMapper( coneMapper );
 
  //
  // Create the Renderer and assign actors to it. A renderer is like a
  // viewport. It is part or all of a window on the screen and it is
  // responsible for drawing the actors it has.  We also set the background
  // color here
  //
  vtkRenderer *ren1= vtkRenderer::New();
  ren1->AddActor( coneActor );
  ren1->SetBackground( 0.1, 0.2, 0.4 );
 
  //
  // Finally we create the render window which will show up on the screen
  // We put our renderer into the render window using AddRenderer. We also
  // set the size to be 300 pixels by 300
  //
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer( ren1 );
  renWin->SetSize( 300, 300 );
 
  //
  // now we loop over 360 degreeees and render the cone each time
  //
  int i;
  for (i = 0; i < 360; ++i)
    {
    // render the image
    renWin->Render();
    // rotate the active camera by one degree
    ren1->GetActiveCamera()->Azimuth( 1 );
    }
 
  //
  // Free up any objects we created
  //
  cone->Delete();
  coneMapper->Delete();
  coneActor->Delete();
  ren1->Delete();
  renWin->Delete();
 
  return 0;
}
 

Example2: Load and access VTK data

vtkUnstructuredGridReader *polyDataReader = vtkUnstructuredGridReader::New();
//  polyDataReader->DebugOn();
  polyDataReader->ReadAllScalarsOn(); //NEVER FORGET THIS
  polyDataReader->ReadAllVectorsOn(); //NEVER FORGET THIS
  polyDataReader->SetFileName(str_vtk_file);
  polyDataReader->Update();
  vtkUnstructuredGrid *polyData = polyDataReader->GetOutput();
  if (polyData == NULL) {
    printf("##ERROR: polyData == NULL\n");
  }
  printf("NUMBER OF POINTS: %d\n", polyData->GetPoints()->GetNumberOfPoints());
  printf("NUMBER OF CELLS: %d\n", polyData->GetNumberOfCells());
  printf("POINTS EXAMPLE: %d\n");
  for (int i=0; i<3; i++) {
    printf("%lf %lf %lf\n", polyData->GetPoint(i)[0], polyData->GetPoint(i)[1], polyData->GetPoint(i)[2]);
  }
  printf("ELEMENTS EXAMPLE: %d\n");
  for (int i=0; i<3; i++) {
    printf("%d ", polyData->GetCell(i)->GetCellType());
    for (int j=0; j<polyData->GetCell(i)->GetNumberOfPoints(); j++)
      printf("%d ", polyData->GetCell(i)->GetPointId(j));
    printf("\n");
  }
  printf("POINT DATA: \n");
  for (int i=0; i<pd->GetNumberOfArrays(); i++) {
    printf("%s\n", pd->GetArrayName(i));
  }
 
  vtkPointData *pd = polyData->GetPointData();
  vtkDataArray *arrT = pd->GetScalars("TEMPERATURE1");
  double sum_T = 0.0;
  double tmp_T = 0.0;
 
  for (long i=0; i<arrT->GetNumberOfTuples(); i++) {
    tmp_T = arrT->GetComponent(i, 0);
    sum_T += tmp_T;
  }
  polyDataReader->Delete();
 
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