Difference between revisions of "VTK/Examples/Cxx/Modelling/Delaunay3D"

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(Replaced content with "= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/Modelling/Delaunay3D Delaunay3D] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =")
 
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== Create a solid mesh from unorganized points ==
+
= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/Modelling/Delaunay3D Delaunay3D] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =
This example creates a tetrahedral mesh from unorganized points. The example uses the vtkDelaunay3D filter. The resulting mesh will be a solid convex hull of the original points. The example takes the points from a XML PolyData file (.vtp) produces the 3D Delaunay tetrahedralization (both with alpha = 0 and a non-zero alpha), and displays the result on the screen.
 
 
 
<div class="floatcenter">[[File:VTK_Examples_Baseline_Modelling_TestDelaunay3D.png]]</div>
 
 
 
==Delaunay3D.cxx==
 
<source lang="cpp">
 
#include <vtkCellArray.h>
 
#include <vtkProperty.h>
 
#include <vtkDataSetMapper.h>
 
#include <vtkActor.h>
 
#include <vtkPoints.h>
 
#include <vtkPolyData.h>
 
#include <vtkPolygon.h>
 
#include <vtkSmartPointer.h>
 
#include <vtkMath.h>
 
#include <vtkRenderer.h>
 
#include <vtkRenderWindow.h>
 
#include <vtkRenderWindowInteractor.h>
 
#include <vtkCleanPolyData.h>
 
#include <vtkDelaunay3D.h>
 
#include <vtkXMLPolyDataReader.h>
 
 
 
int main ( int argc, char *argv[] )
 
{
 
  if(argc < 2)
 
    {
 
    std::cout << "Usage: " << argv[0]
 
              << " filename.vtp" << std::endl;
 
    return EXIT_FAILURE;
 
    }
 
 
 
  //Read the file
 
  vtkSmartPointer<vtkXMLPolyDataReader> reader =
 
    vtkSmartPointer<vtkXMLPolyDataReader>::New();
 
  reader->SetFileName(argv[1]);
 
 
 
  vtkSmartPointer<vtkDataSetMapper> originalMapper =
 
    vtkSmartPointer<vtkDataSetMapper>::New();
 
  originalMapper->SetInputConnection(reader->GetOutputPort());
 
 
 
  vtkSmartPointer<vtkActor> originalActor =
 
    vtkSmartPointer<vtkActor>::New();
 
  originalActor->SetMapper(originalMapper);
 
  originalActor->GetProperty()->SetColor(1,0,0);
 
 
 
  // Clean the polydata. This will remove duplicate points that may be
 
  // present in the input data.
 
  vtkSmartPointer<vtkCleanPolyData> cleaner =
 
    vtkSmartPointer<vtkCleanPolyData>::New();
 
  cleaner->SetInputConnection (reader->GetOutputPort());
 
 
 
  // Generate a tetrahedral mesh from the input points. By
 
  // default, the generated volume is the convex hull of the points.
 
  vtkSmartPointer<vtkDelaunay3D> delaunay3D =
 
    vtkSmartPointer<vtkDelaunay3D>::New();
 
  delaunay3D->SetInputConnection (cleaner->GetOutputPort());
 
 
 
  vtkSmartPointer<vtkDataSetMapper> delaunayMapper =
 
    vtkSmartPointer<vtkDataSetMapper>::New();
 
  delaunayMapper->SetInputConnection(delaunay3D->GetOutputPort());
 
 
 
  vtkSmartPointer<vtkActor> delaunayActor =
 
    vtkSmartPointer<vtkActor>::New();
 
  delaunayActor->SetMapper(delaunayMapper);
 
  delaunayActor->GetProperty()->SetColor(1,0,0);
 
 
 
  // Generate a mesh from the input points. If Alpha is non-zero, then
 
  // tetrahedra, triangles, edges and vertices that lie within the
 
  // alpha radius are output.
 
  vtkSmartPointer<vtkDelaunay3D> delaunay3DAlpha =
 
    vtkSmartPointer<vtkDelaunay3D>::New();
 
  delaunay3DAlpha->SetInputConnection (cleaner->GetOutputPort());
 
  delaunay3DAlpha->SetAlpha(0.1);
 
 
 
  vtkSmartPointer<vtkDataSetMapper> delaunayAlphaMapper =
 
    vtkSmartPointer<vtkDataSetMapper>::New();
 
  delaunayAlphaMapper->SetInputConnection(delaunay3DAlpha->GetOutputPort());
 
 
 
  vtkSmartPointer<vtkActor> delaunayAlphaActor =
 
    vtkSmartPointer<vtkActor>::New();
 
  delaunayAlphaActor->SetMapper(delaunayAlphaMapper);
 
  delaunayAlphaActor->GetProperty()->SetColor(1,0,0);
 
 
 
  // Visualize
 
 
 
  // Define viewport ranges
 
  // (xmin, ymin, xmax, ymax)
 
  double leftViewport[4] = {0.0, 0.0, 0.33, 1.0};
 
  double centerViewport[4] = {0.33, 0.0, 0.66, 1.0};
 
  double rightViewport[4] = {0.66, 0.0, 1.0, 1.0};
 
 
 
  // Create a renderer, render window, and interactor
 
  vtkSmartPointer<vtkRenderer> originalRenderer =
 
    vtkSmartPointer<vtkRenderer>::New();
 
  vtkSmartPointer<vtkRenderer> delaunayRenderer =
 
    vtkSmartPointer<vtkRenderer>::New();
 
  vtkSmartPointer<vtkRenderer> delaunayAlphaRenderer =
 
    vtkSmartPointer<vtkRenderer>::New();
 
   
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
 
    vtkSmartPointer<vtkRenderWindow>::New();
 
  renderWindow->SetSize(900,300);
 
 
 
  renderWindow->AddRenderer(originalRenderer);
 
  originalRenderer->SetViewport(leftViewport);
 
  renderWindow->AddRenderer(delaunayRenderer);
 
  delaunayRenderer->SetViewport(centerViewport);
 
  renderWindow->AddRenderer(delaunayAlphaRenderer);
 
  delaunayAlphaRenderer->SetViewport(rightViewport);
 
 
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
 
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
 
 
  originalRenderer->AddActor(originalActor);
 
  delaunayRenderer->AddActor(delaunayActor);
 
  delaunayAlphaRenderer->AddActor(delaunayAlphaActor);
 
 
 
  originalRenderer->SetBackground(.3, .6, .3);
 
  delaunayRenderer->SetBackground(.4, .6, .3);
 
  delaunayAlphaRenderer->SetBackground(.5, .6, .3);
 
 
 
  // Render and interact
 
  renderWindow->Render();
 
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
 
}
 
 
 
</source>
 
 
 
{{VTKCMakeLists|{{SUBPAGENAME}}}}
 

Latest revision as of 18:12, 27 March 2019

See Delaunay3D on the new VTKExamples website.