private void Frustum()
{
// Create a frustum.
// in this example we need the renderer first to retrieve the active camera
// in order to get camera's frustum planes
vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
vtkCamera camera = renderer.GetActiveCamera();
double[] aspect = renderer.GetAspect();
double aspectRatio = aspect[0] / aspect[1];
// allocate memory for 24 unmanaged doubles
int size = Marshal.SizeOf(typeof(double)) * 24;
IntPtr ptr = Marshal.AllocHGlobal(size);
camera.GetFrustumPlanes(aspectRatio, ptr);
// in case we would need this values directly we could copy
// the unmanaged double array to a managed array like so:
// double[] planesArray = new double[24];
// Marshal.Copy(ptr, planesArray, 0, 24);
// but fortunately we can forward the IntPtr directly to the function
// SetFrustumPlanes()
vtkPlanes planes = vtkPlanes.New();
planes.SetFrustumPlanes(ptr);
// free unmanaged memory
Marshal.FreeHGlobal(ptr);
vtkFrustumSource frustumSource = vtkFrustumSource.New();
frustumSource.SetPlanes(planes);
frustumSource.Update();
vtkPolyData frustum = frustumSource.GetOutput();
// Visualize
vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
mapper.SetInput(frustum);
vtkActor actor = vtkActor.New();
actor.SetMapper(mapper);
renderer.SetBackground(.2, .1, .3); // Background color dark purple
renderer.AddActor(actor);
renderer.ResetCamera();
}
private void Planes()
{
// in this example we need the renderer first to retrieve the active camera
// in order to get camera's frustum planes and renderer's aspectratio
vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
vtkRenderer renderer = vtkRenderer.New();
renderer = renderWindow.GetRenderers().GetFirstRenderer();
vtkCamera camera = renderer.GetActiveCamera();
double[] aspect = renderer.GetAspect();
double aspectRatio = aspect[0] / aspect[1];
vtkPlanes planes = vtkPlanes.New();
// one way
{
// allocate memory for 24 unmanaged doubles
int size = Marshal.SizeOf(typeof(double)) * 24;
IntPtr ptr = Marshal.AllocHGlobal(size);
camera.GetFrustumPlanes(aspectRatio, ptr);
// in case we would need this values diectly we could copy
// the unmanaged double array to a managed array like so:
// double[] planesArray = new double[24];
// Marshal.Copy(ptr, planesArray, 0, 24);
// but fortunately we can forward the IntPtr directly to the function
// SetFrustumPlanes()
planes.SetFrustumPlanes(ptr);
// free unmanaged memory
Marshal.FreeHGlobal(ptr);
}
// another way
{
vtkSphereSource sphereSource = vtkSphereSource.New();
sphereSource.Update();
double[] bounds = new double[6];
bounds = sphereSource.GetOutput().GetBounds();
planes.SetBounds(bounds[0], bounds[1], bounds[2], bounds[3], bounds[4], bounds[5]);
}
// nothing to visualize
}
/// <summary>
/// A console application that creates a
/// vtkRenderWindow without a Windows Form
/// </summary>
/// <param name="argv"></param>
public static void Main(String[] argv)
{
// Demonstrate how to use the vtkBoxWidget 3D widget,
// This script uses a 3D box widget to define a "clipping box" to clip some
// simple geometry (a mace). Make sure that you hit the "W" key to activate the widget.
// Create a mace out of filters.
sphere = vtkSphereSource.New();
cone = vtkConeSource.New();
glyph = vtkGlyph3D.New();
glyph.SetInputConnection(sphere.GetOutputPort());
glyph.SetSource(cone.GetOutput());
glyph.SetVectorModeToUseNormal();
glyph.SetScaleModeToScaleByVector();
glyph.SetScaleFactor(0.25);
// The sphere and spikes are appended into a single polydata. This just makes things
// simpler to manage.
apd = vtkAppendPolyData.New();
apd.AddInput(glyph.GetOutput());
apd.AddInput(sphere.GetOutput());
maceMapper = vtkPolyDataMapper.New();
maceMapper.SetInputConnection(apd.GetOutputPort());
maceActor = vtkLODActor.New();
maceActor.SetMapper(maceMapper);
maceActor.VisibilityOn();
// This portion of the code clips the mace with the vtkPlanes implicit function.
// The clipped region is colored green.
planes = vtkPlanes.New();
clipper = vtkClipPolyData.New();
clipper.SetInputConnection(apd.GetOutputPort());
clipper.SetClipFunction(planes);
clipper.InsideOutOn();
selectMapper = vtkPolyDataMapper.New();
selectMapper.SetInputConnection(clipper.GetOutputPort());
selectActor = vtkLODActor.New();
selectActor.SetMapper(selectMapper);
selectActor.GetProperty().SetColor(0, 1, 0);
selectActor.VisibilityOff();
selectActor.SetScale(1.01, 1.01, 1.01);
// Create the RenderWindow, Renderer and both Actors
ren1 = vtkRenderer.New();
renWin = vtkRenderWindow.New();
renWin.AddRenderer(ren1);
iren = vtkRenderWindowInteractor.New();
iren.SetRenderWindow(renWin);
// The SetInteractor method is how 3D widgets are associated with the render
// window interactor. Internally, SetInteractor sets up a bunch of callbacks
// using the Command/Observer mechanism (AddObserver()).
boxWidget = vtkBoxWidget.New();
boxWidget.SetInteractor(iren);
boxWidget.SetPlaceFactor(1.25);
ren1.AddActor(maceActor);
ren1.AddActor(selectActor);
// Add the actors to the renderer, set the background and size
ren1.SetBackground(0.1, 0.2, 0.4);
renWin.SetSize(300, 300);
// Place the interactor initially. The input to a 3D widget is used to
// initially position and scale the widget. The EndInteractionEvent is
// observed which invokes the SelectPolygons callback.
boxWidget.SetInput(glyph.GetOutput());
boxWidget.PlaceWidget();
boxWidget.EndInteractionEvt += new vtkObject.vtkObjectEventHandler(SelectPolygons);
// render the image
iren.Initialize();
iren.Start();
//Clean up
deleteAllVTKObjects();
}
private void SelectAreaClick(vtkObject sender, vtkObjectEventArgs e)
{
int[] clickPos = Inter.GetEventPosition();
vtkAreaPicker picker = vtkAreaPicker.New();
picker.AreaPick(clickPos[0], clickPos[1], clickPos[0] + 100, clickPos[1] + 100, Viewport);
if (picker.GetActor() != null)
{
vtkPlanes Boundary = picker.GetFrustum();
vtkExtractGeometry Box = vtkExtractGeometry.New();
Box.SetImplicitFunction(Boundary);
Box.SetInput(picker.GetActor().GetMapper().GetInput());
vtkVertexGlyphFilter glyphFilter = vtkVertexGlyphFilter.New();
glyphFilter.SetInputConnection(Box.GetOutputPort());
glyphFilter.Update();
vtkPolyData selected = glyphFilter.GetOutput();
vtkPoints points = vtkPoints.New();
vtkUnstructuredGrid grid = vtkUnstructuredGrid.New();
for (int i = 0; i < selected.GetNumberOfPoints(); i++)
{
points.InsertNextPoint(selected.GetPoint(i)[0], selected.GetPoint(i)[1], selected.GetPoint(i)[2]);
}
grid.SetPoints(points);
vtkSphereSource sphere = vtkSphereSource.New();
sphere.SetPhiResolution(6);
sphere.SetThetaResolution(6);
sphere.SetRadius(0.1);
vtkGlyph3D glyph3D = vtkGlyph3D.New();
glyph3D.SetInput(grid);
glyph3D.SetSourceConnection(sphere.GetOutputPort());
vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
mapper.SetInputConnection(glyph3D.GetOutputPort());
//double[] P = new double[3];
//bool selected = false;
//vtkPoints points = Faces.GetPoints();
//double[] ClickedPoint = PointPicker.GetActor().GetMapper().GetInput().GetPoint(PointPicker.GetPointId());
//for (int i = 0; i < points.GetNumberOfPoints(); i++)
//{
// if (Math.Abs(points.GetPoint(i)[0] - ClickedPoint[0]) < 1e-6 &&
// Math.Abs(points.GetPoint(i)[1] - ClickedPoint[1]) < 1e-6 &&
// Math.Abs(points.GetPoint(i)[2] - ClickedPoint[2]) < 1e-6)
// {
// selected = true;
// P = points.GetPoint(i);
// break;
// }
//}
//
//if (selected == true)
//{
// SelectionPoints.InsertNextPoint(P[0], P[1], P[2]);
//
// SelectionGlyph = vtkGlyph3D.New();
// SelectionGlyph.SetInput(SelectionPolyData);
// SelectionGlyph.SetSourceConnection(SelectionSphere.GetOutputPort());
// SelectionMapper.SetInputConnection(SelectionGlyph.GetOutputPort());
//
// // Refresh Viewport
// Refresh();
//}
}
}