ConvexHullShrinkWrap
Repository source: 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.
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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();
}
}