Difference between revisions of "VTK/Examples/Cxx/StructuredGrid/BlankPoint"

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<div class="floatcenter">[[File:VTK_Examples_Baseline_StructuredGrid_TestBlankPoint.png]]</div>
 
<div class="floatcenter">[[File:VTK_Examples_Baseline_StructuredGrid_TestBlankPoint.png]]</div>
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This does not work as expected. The idea of blanking a point is so that it is not displayed, but all of the points seem to be displayed even though one has been blanked. I would also expect the cells that use a blanked point to be absent as well.
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==BlankPoint.cxx==
 
==BlankPoint.cxx==
 
<source lang="cpp">
 
<source lang="cpp">

Revision as of 08:27, 12 December 2013

VTK Examples Baseline StructuredGrid TestBlankPoint.png

This does not work as expected. The idea of blanking a point is so that it is not displayed, but all of the points seem to be displayed even though one has been blanked. I would also expect the cells that use a blanked point to be absent as well.

BlankPoint.cxx

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkIdList.h>
#include <vtkProperty.h>
#include <vtkStructuredGrid.h>
#include <vtkXMLStructuredGridWriter.h>
#include <vtkMath.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkStructuredGridGeometryFilter.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkXMLStructuredGridWriter.h>

int main(int, char *[])
{
  // Create a grid
  vtkSmartPointer<vtkStructuredGrid> structuredGrid =
    vtkSmartPointer<vtkStructuredGrid>::New();

  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  
  unsigned int gridSize = 8;
  unsigned int counter = 0;
  // Create a 5x5 grid of points
  for(unsigned int j = 0; j < gridSize; j++)
    {
    for(unsigned int i = 0; i < gridSize; i++)
      {
      if(i == 3 && j == 3) // Make one point higher than the rest
        {
        points->InsertNextPoint(i, j, 2);
	std::cout << "The different point is number " << counter << std::endl;
        }
      else
        {
        points->InsertNextPoint(i, j, 0); // Make most of the points the same height
        }
      counter++;
      }
    }

  // Specify the dimensions of the grid
  structuredGrid->SetDimensions(gridSize,gridSize,1);

  structuredGrid->SetPoints(points);

  structuredGrid->BlankPoint(27);
  structuredGrid->Modified();

  // Create a mapper and actor
  vtkSmartPointer<vtkDataSetMapper> gridMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  gridMapper->SetInputConnection(structuredGrid->GetProducerPort());
#else
  gridMapper->SetInputData(structuredGrid);
#endif

  vtkSmartPointer<vtkActor> gridActor =
    vtkSmartPointer<vtkActor>::New();
  gridActor->SetMapper(gridMapper);
  gridActor->GetProperty()->EdgeVisibilityOn();
  gridActor->GetProperty()->SetEdgeColor(0,0,1);

  // 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(gridActor);
  renderer->SetBackground(.3, .6, .3); // Background color green

  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(BlankPoint)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(BlankPoint MACOSX_BUNDLE BlankPoint.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(BlankPoint ${VTK_LIBRARIES})
else()
  target_link_libraries(BlankPoint vtkHybrid vtkWidgets)
endif()

Download and Build BlankPoint

Click here to download BlankPoint. and its CMakeLists.txt file.

Once the tarball BlankPoint.tar has been downloaded and extracted,

cd BlankPoint/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:

./BlankPoint

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.