MeshQuality

VTKExamples/Java/PolyData/MeshQuality


Description

This example uses one of many selectable methods to determine the quality of a mesh. In this case, we have selected to use the area of the triangles. We show how to retrieve the quality metric computed on each triangle after the process is completed.

Other Languages

See (Cxx)

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

MeshQuality.java

import vtk.vtkActor;
import vtk.vtkNamedColors;
import vtk.vtkSphereSource;
import vtk.vtkTriangleFilter;
import vtk.vtkNativeLibrary;
import vtk.vtkPolyData;
import vtk.vtkMeshQuality;
import vtk.vtkPolyDataMapper;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;
import vtk.vtkDoubleArray;

public class MeshQuality 
{
  // -----------------------------------------------------------------
  // Load VTK library and print which library was not properly loaded
  static 
  {
    if (!vtkNativeLibrary.LoadAllNativeLibraries()) 
    {
      for (vtkNativeLibrary lib : vtkNativeLibrary.values()) 
      {
        if (!lib.IsLoaded()) 
        {
          System.out.println(lib.GetLibraryName() + " not loaded");
        }
      }
    }
    vtkNativeLibrary.DisableOutputWindow(null);
  }
  // -----------------------------------------------------------------

  public static void main(String s[]) 
  {
    vtkNamedColors Color = new vtkNamedColors();

    //Renderer Background Color
    double BgColor[] = new double[4];

    //Change Color Name to Use your own Color for Renderer Background
    Color.GetColor("NavajoWhite",BgColor);

    //Create a Sphere
    vtkSphereSource Sphere = new vtkSphereSource();
    //Sphere.SetCenter(0.0,0.0,0.0);
    phere.SetRadius(5.0);
    Sphere.Update();

    //Change Phi and Theta Value for Smooth Surface
    Sphere.SetPhiResolution(12);
    Sphere.SetThetaResolution(14);

    vtkTriangleFilter triangleFilter = new vtkTriangleFilter();
    triangleFilter.SetInputConnection(Sphere.GetOutputPort());
    triangleFilter.Update();

    vtkPolyData Mesh = triangleFilter.GetOutput();
    System.out.println("There are" + " " +  Mesh.GetNumberOfCells() +" "  + "Cells");


    vtkMeshQuality QualityFilter = new vtkMeshQuality();
    QualityFilter.SetInputData(Mesh);
    QualityFilter.SetTriangleQualityMeasureToArea();
    QualityFilter.Update();


    vtkDoubleArray QualityArray = new vtkDoubleArray().FastDownCast(QualityFilter.GetOutput().GetCellData().GetArray("Quality"));
    System.out.println("There are" + QualityArray.GetNumberOfTuples() + "values");


    for(int i=0;i<QualityArray.GetNumberOfTuples();i++)
    {
      double val = QualityArray.GetValue(i);
      System.out.println("Value" + " "+i + " " + val);

    }

    vtkPolyData PolyData = new vtkPolyData();
    PolyData.ShallowCopy(QualityFilter.GetOutput());

    //Create a Mapper and Actor for Sphere
    vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
    Mapper.SetInputData(PolyData);

    vtkActor Actor = new vtkActor();
    Actor.SetMapper(Mapper);


    // Create the renderer, render window and interactor.
    vtkRenderer ren = new vtkRenderer();
    vtkRenderWindow renWin = new vtkRenderWindow();
    renWin.AddRenderer(ren);
    vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
    iren.SetRenderWindow(renWin);

    // Visualise the arrow
    ren.AddActor(Actor);
    ren.SetBackground(BgColor);
    ren.ResetCamera();

    renWin.SetSize(300,300);
    renWin.Render();

    iren.Initialize();
    iren.Start();

  }
}