Difference between revisions of "VTK/Examples/Cxx/PolyData/DeleteCells"

From KitwarePublic
< VTK‎ | Examples‎ | Cxx
Jump to navigationJump to search
(Created page with "== Delete Cells == This example demonstrates how to delete a cell from a vtkPolyData. This is a three-step process: first, build upward-links from points to cells (this is not d...")
 
(Replaced content with "= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/DeleteCells DeleteCells] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].'...")
 
(10 intermediate revisions by 3 users not shown)
Line 1: Line 1:
== Delete Cells  ==
+
= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/DeleteCells DeleteCells] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =
This example demonstrates how to delete a cell from a vtkPolyData. This is a three-step process: first, build upward-links from points to cells (this is not done by default); second, mark cells for deletion; third, delete the marked cells.
 
 
 
==DeleteCells.cxx==
 
<source lang="cpp">
 
#include <vtkActor.h>
 
#include <vtkCellArray.h>
 
#include <vtkLine.h>
 
#include <vtkPoints.h>
 
#include <vtkPolyData.h>
 
#include <vtkPolyDataMapper.h>
 
#include <vtkRenderer.h>
 
#include <vtkRenderWindow.h>
 
#include <vtkRenderWindowInteractor.h>
 
#include <vtkSmartPointer.h>
 
 
int main(int, char *[])
 
{
 
  vtkSmartPointer<vtkPoints> points =
 
    vtkSmartPointer<vtkPoints>::New();
 
  points->InsertNextPoint(0,0,0);
 
  points->InsertNextPoint(1,0,0);
 
  points->InsertNextPoint(1,1,0);
 
  points->InsertNextPoint(0,1,0);
 
 
  vtkSmartPointer<vtkLine> line0 =
 
    vtkSmartPointer<vtkLine>::New();
 
  line0->GetPointIds()->SetId(0, 0);
 
  line0->GetPointIds()->SetId(1, 1);
 
 
  vtkSmartPointer<vtkLine> line1 =
 
    vtkSmartPointer<vtkLine>::New();
 
  line1->GetPointIds()->SetId(0, 1);
 
  line1->GetPointIds()->SetId(1, 2);
 
 
  vtkSmartPointer<vtkLine> line2 =
 
    vtkSmartPointer<vtkLine>::New();
 
  line2->GetPointIds()->SetId(0, 2);
 
  line2->GetPointIds()->SetId(1, 3);
 
 
  vtkSmartPointer<vtkCellArray> lines =
 
    vtkSmartPointer<vtkCellArray>::New();
 
  lines->InsertNextCell(line0);
 
  lines->InsertNextCell(line1);
 
  lines->InsertNextCell(line2);
 
 
  vtkSmartPointer<vtkPolyData> polydata =
 
    vtkSmartPointer<vtkPolyData>::New();
 
  polydata->SetPoints(points);
 
  polydata->SetLines(lines);
 
 
 
  // Tell the polydata to build 'upward' links from points to cells.
 
  polydata->BuildLinks();
 
  // Mark a cell as deleted.
 
  polydata->DeleteCell(1);
 
  // Remove the marked cell.
 
  polydata->RemoveDeletedCells();
 
 
 
  // Visualize
 
  vtkSmartPointer<vtkPolyDataMapper> mapper =
 
    vtkSmartPointer<vtkPolyDataMapper>::New();
 
  mapper->SetInputConnection(polydata->GetProducerPort());
 
 
  vtkSmartPointer<vtkActor> actor =
 
    vtkSmartPointer<vtkActor>::New();
 
  actor->SetMapper(mapper);
 
 
  vtkSmartPointer<vtkRenderer> renderer =
 
    vtkSmartPointer<vtkRenderer>::New();
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
 
    vtkSmartPointer<vtkRenderWindow>::New();
 
  renderWindow->AddRenderer(renderer);
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
 
      vtkSmartPointer<vtkRenderWindowInteractor>::New();
 
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
  renderer->AddActor(actor);
 
 
  renderWindow->Render();
 
  renderWindowInteractor->Start();
 
 
  return EXIT_SUCCESS;
 
}
 
 
 
== CMakeLists.txt ==
 
 
 
<source lang="cmake">
 
PROJECT(FilledContours)
 
CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
 
 
FIND_PACKAGE(VTK REQUIRED)
 
INCLUDE(${VTK_USE_FILE})
 
 
ADD_EXECUTABLE(DeleteCells DeleteCells.cxx)
 
TARGET_LINK_LIBRARIES(DeleteCells vtkHybrid)
 
</source>
 

Latest revision as of 17:12, 9 September 2019