ConvexHullShrinkWrap

VTKExamples/Java/PolyData/ConvexHullShrinkWrap


Description

This example creates a point cloud, and a sphere larger than the point cloud which fully contains the cloud. It then "shrink wraps" the sphere onto the points. This produces approximately a convex hull.

Other Languages

See (Cxx)

Code

ConvexHullShrinkWrap.java

import vtk.vtkActor;
import vtk.vtkNamedColors;
import vtk.vtkSphereSource;
import vtk.vtkPointSource;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;
import vtk.vtkGlyph3D;
import vtk.vtkDataSetMapper;
import vtk.vtkNativeLibrary;
import vtk.vtkSmoothPolyDataFilter;

public class ConvexHullShrinkWrap  
{
  // ----------------------------------------------------------------
  // 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();

    //For Glyph3DActor Color
    double GlyphActorColor[] = new double[4];
    //For Actor Color
    double ActorColor[] = new double[4];
    //Renderer Background Color
    double EdgeColor[] = new double[4];
    //Renderer Background Color
    double BgColor[] = new double[4];

    //Change Color Name to Use your own Color for Change Actor Color
    Color.GetColor("Banana",GlyphActorColor);
    //Change Color Name to Use your own Color for Change Actor Color
    Color.GetColor("Tomato",ActorColor);
    //Change Color Name to Use your own Color for Change Actor Color
    Color.GetColor("IvoryBlack",EdgeColor);
    //Change Color Name to Use your own Color for Renderer Background
    Color.GetColor("DarkSlateGray",BgColor);

    //Create a Sphere
    vtkSphereSource Sphere = new vtkSphereSource();
    Sphere.SetRadius(10.0);
    Sphere.SetPhiResolution(50);
    Sphere.SetThetaResolution(50);
    vtkPointSource PointSource = new vtkPointSource();
    PointSource.SetNumberOfPoints(60);
    PointSource.SetRadius(2);

    vtkSmoothPolyDataFilter SmoothFilter = new vtkSmoothPolyDataFilter();
    SmoothFilter.SetInputConnection(0, Sphere.GetOutputPort());
    SmoothFilter.SetInputConnection(1, PointSource.GetOutputPort());

    vtkSphereSource GlyphSource = new vtkSphereSource();
    GlyphSource.SetRadius(0.04);

    vtkGlyph3D Glyph3D = new vtkGlyph3D();
    Glyph3D.SetInputConnection(PointSource.GetOutputPort());
    Glyph3D.SetSourceConnection(GlyphSource.GetOutputPort());
    Glyph3D.ScalingOff();

    vtkDataSetMapper Glyph3DMapper = new vtkDataSetMapper();
    Glyph3DMapper.SetInputConnection(Glyph3D.GetOutputPort());
    Glyph3DMapper.ScalarVisibilityOff();

    vtkActor Glyph3DActor = new vtkActor();
    Glyph3DActor.SetMapper(Glyph3DMapper);
    Glyph3DActor.GetProperty().SetColor(GlyphActorColor);

    vtkDataSetMapper Mapper = new vtkDataSetMapper();
    Mapper.SetInputConnection(SmoothFilter.GetOutputPort());
    Mapper.ScalarVisibilityOff();

    // Create an actor for the surface  
    vtkActor Actor = new vtkActor();
    Actor.SetMapper(Mapper);
    Actor.GetProperty().SetDiffuseColor(ActorColor);
    Actor.GetProperty().SetEdgeColor(EdgeColor);
    Actor.GetProperty().SetOpacity(1.0);
    Actor.GetProperty().EdgeVisibilityOff();

    // 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.AddActor(Glyph3DActor);
    ren.SetBackground(BgColor);
    ren.ResetCamera();

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

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


  }
}