private void vtkPolyDataConnectivityFilter_LargestRegion()
{
// Small sphere
vtkSphereSource sphereSource1 = vtkSphereSource.New();
sphereSource1.Update();
// Large sphere
vtkSphereSource sphereSource2 = vtkSphereSource.New();
sphereSource2.SetRadius(10);
sphereSource2.SetCenter(25, 0, 0);
sphereSource2.SetThetaResolution(10);
sphereSource2.SetPhiResolution(10);
sphereSource2.Update();
vtkAppendPolyData appendFilter = vtkAppendPolyData.New();
appendFilter.AddInputConnection(sphereSource1.GetOutputPort());
appendFilter.AddInputConnection(sphereSource2.GetOutputPort());
appendFilter.Update();
vtkPolyDataConnectivityFilter connectivityFilter = vtkPolyDataConnectivityFilter.New();
connectivityFilter.SetInputConnection(appendFilter.GetOutputPort());
connectivityFilter.SetExtractionModeToLargestRegion();
connectivityFilter.Update();
// Create a mapper and actor for original data
vtkPolyDataMapper originalMapper = vtkPolyDataMapper.New();
originalMapper.SetInputConnection(appendFilter.GetOutputPort());
originalMapper.Update();
vtkActor originalActor = vtkActor.New();
originalActor.SetMapper(originalMapper);
// Create a mapper and actor for extracted data
vtkPolyDataMapper extractedMapper = vtkPolyDataMapper.New();
extractedMapper.SetInputConnection(connectivityFilter.GetOutputPort());
extractedMapper.Update();
vtkActor extractedActor = vtkActor.New();
extractedActor.GetProperty().SetColor(1, 0, 0);
extractedActor.SetMapper(extractedMapper);
// get a reference to the renderwindow of our renderWindowControl1
vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
// renderer
vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
// set background color
renderer.SetBackground(0.2, 0.3, 0.4);
// add our actor to the renderer
renderer.AddActor(originalActor);
renderer.AddActor(extractedActor);
}
public static vtkPolyData Create(List <List <double[]> > xyzList, double radius)
{
vtkAppendPolyData append = new vtkAppendPolyData();
foreach (List <double[]> list in xyzList)
{
append.AddInput(Create(list, radius));
}
append.Update();
return(append.GetOutput());
}
static public vtkAlgorithmOutput combiFrustumCone(double start_radius, double distance,
double angle, bool is_foucs, double foucs_radius)
{
double tanArc = Math.Tan(Math.PI * angle / 180);
double origin_dis = start_radius / tanArc;
if (is_foucs) // 缩小
{
double origin_foucs_dis = foucs_radius / tanArc;
double fouce_dis = origin_dis - origin_foucs_dis;
if (distance > fouce_dis) //缩小到焦点后放大
{
vtkAppendPolyData polydata = vtkAppendPolyData.New();
polydata.AddInputConnection(genFrustumCone(origin_dis, start_radius, fouce_dis, false));
vtkTransform transform = vtkTransform.New();
transform.Translate(0, 0, fouce_dis);
vtkTransformPolyDataFilter transFilter = vtkTransformPolyDataFilter.New();
origin_dis = origin_foucs_dis + distance - fouce_dis;
transFilter.SetInputConnection(genFrustumCone(origin_dis, origin_dis * tanArc, distance - fouce_dis, true));
transFilter.SetTransform(transform); //use vtkTransform (or maybe vtkLinearTransform)
transFilter.Update();
polydata.AddInputConnection(transFilter.GetOutputPort());
polydata.Update();
return(polydata.GetOutputPort());
}
else
{
return(genFrustumCone(origin_dis, start_radius, distance, false));
}
}
else // 放大
{
double total_dis = origin_dis + distance;
double end_radius = total_dis * tanArc;
return(genFrustumCone(total_dis, end_radius, distance, true));
}
}