<div dir="ltr"><div class="gmail_quote"><div dir="ltr">Hi all,</div><div dir="ltr"><br><div>I have just started experimenting with VTK via the ActiViz.NET wrapper. The examples are a very useful introduction, and I am really enjoying the toolkit so far.</div><div><br></div><div>As an exercise, I have taken the regular BoxWidget example, and replaced the mace object with an STL I have. However I am running into a slight problem:</div><div><br></div><div>When I move the BoxWidget to clip the STL image, it only seems to clip the front of the STL. </div><div>An example of what I mean is visible here: <<<a href="http://imgur.com/Yalu91C" target="_blank">http://imgur.com/Yalu91C</a>>></div><div><br></div><div>I am pretty sure it is something small I am missing, it's as if the clipping algorithm does not see the not clipped part as an outside surface, perhaps a normal problem. Can anyone perhaps shed some light on this for me?</div><div><br></div><div>.NET Code below for critique:</div><div><br></div><div><div>using Kitware.VTK;</div><div>using System;</div><div><br></div><div>/// <summary></div><div>/// Class containing main method</div><div>/// </summary></div><div>public class Demo</div><div>{</div><div><br></div><div><br></div><div> public static vtkWindowedSincPolyDataFilter GetBoneSTL()</div><div> {</div><div> string path = "C:\\Data\\sandbox\\python\\dicom\\example_images\\Shoulder";</div><div> var reader = new vtkDICOMImageReader();</div><div> reader.SetDirectoryName(path);</div><div><br></div><div> var threshold = new vtkImageThreshold();</div><div> threshold.SetInputConnection(reader.GetOutputPort());</div><div> threshold.ThresholdByLower(350);// remove all soft tissue</div><div> threshold.ReplaceInOn();</div><div> threshold.SetInValue(0); //set all values below 400 to 0</div><div> threshold.ReplaceOutOn();</div><div> threshold.SetOutValue(1); //set all values above 400 to 1</div><div><br></div><div><br></div><div> //Discrete Marching Cubes algorithm</div><div> var dmc = new vtkDiscreteMarchingCubes();</div><div> dmc.SetInputConnection(threshold.GetOutputPort());</div><div> dmc.GenerateValues(1, 1, 1);</div><div><br></div><div> //Clean the mesh</div><div> var connect = new vtkPolyDataConnectivityFilter();</div><div> connect.SetInputConnection(dmc.GetOutputPort());</div><div> connect.SetExtractionModeToLargestRegion();</div><div><br></div><div> var clean = new vtkCleanPolyData();</div><div> clean.SetInputConnection(connect.GetOutputPort());</div><div> //clean.SetInputConnection(dmc.GetOutputPort());</div><div><br></div><div> //Smooth</div><div> var smooth = new vtkWindowedSincPolyDataFilter();</div><div> smooth.SetNumberOfIterations(25);</div><div> smooth.SetInputConnection(clean.GetOutputPort());</div><div><br></div><div><br></div><div> return smooth;</div><div> }</div><div> </div><div> </div><div> </div><div> public static void Main(String[] argv)</div><div> {</div><div><br></div><div> </div><div> boneSTL = Demo.GetBoneSTL();</div><div><br></div><div> glyph = vtkGlyph3D.New();</div><div><br></div><div> glyph.SetInputConnection(boneSTL.GetOutputPort());</div><div> glyph.SetVectorModeToUseNormal();</div><div> glyph.SetScaleModeToScaleByVector();</div><div> glyph.SetScaleFactor(0.25);</div><div><br></div><div> boneMapper = vtkPolyDataMapper.New();</div><div> boneMapper.SetInputConnection(boneSTL.GetOutputPort());</div><div><br></div><div> boneActor = vtkLODActor.New();</div><div> boneActor.SetMapper(boneMapper);</div><div> </div><div> boneActor.VisibilityOn();</div><div><br></div><div> // This portion of the code clips the mace with the vtkPlanes implicit function.</div><div> // The clipped region is colored green.</div><div> planes = vtkPlanes.New();</div><div> clipper = vtkClipPolyData.New();</div><div><br></div><div> clipper.SetInputConnection(boneSTL.GetOutputPort()); </div><div> clipper.SetClipFunction(planes); </div><div> clipper.InsideOutOn();</div><div><br></div><div> selectMapper = vtkPolyDataMapper.New();</div><div> selectMapper.SetInputConnection(clipper.GetOutputPort());</div><div> selectMapper.ScalarVisibilityOff();</div><div><br></div><div> selectActor = vtkLODActor.New();</div><div> selectActor.SetMapper(selectMapper);</div><div> selectActor.GetProperty().SetColor(0, 1, 0);</div><div> selectActor.VisibilityOff();</div><div> selectActor.SetScale(1.01, 1.01, 1.01);</div><div><br></div><div> // Create the RenderWindow, Renderer and both Actors</div><div> ren1 = vtkRenderer.New();</div><div> renWin = vtkRenderWindow.New();</div><div> renWin.AddRenderer(ren1);</div><div> iren = vtkRenderWindowInteractor.New();</div><div> iren.SetRenderWindow(renWin);</div><div><br></div><div> // The SetInteractor method is how 3D widgets are associated with the render</div><div> // window interactor. Internally, SetInteractor sets up a bunch of callbacks</div><div> // using the Command/Observer mechanism (AddObserver()).</div><div> boxWidget = vtkBoxWidget.New();</div><div> boxWidget.SetInteractor(iren);</div><div> boxWidget.SetPlaceFactor(1.25);</div><div> ren1.AddActor(boneActor);</div><div> ren1.AddActor(selectActor);</div><div><br></div><div> // Add the actors to the renderer, set the background and size</div><div> ren1.SetBackground(0.1, 0.2, 0.4);</div><div> renWin.SetSize(600, 600);</div><div><br></div><div> // Place the interactor initially. The input to a 3D widget is used to </div><div> // initially position and scale the widget. The EndInteractionEvent is</div><div> // observed which invokes the SelectPolygons callback.</div><div> boxWidget.SetInput(glyph.GetOutput());</div><div> boxWidget.PlaceWidget();</div><div> boxWidget.EndInteractionEvt += new vtkObject.vtkObjectEventHandler(SelectPolygons);</div><div> </div><div> // render the image</div><div> iren.Initialize();</div><div> iren.Start();</div><div> //Clean up</div><div> deleteAllVTKObjects();</div><div> }</div><div><br></div><div> static vtkPolyDataAlgorithm boneSTL;</div><div> static vtkGlyph3D glyph;</div><div> static vtkAppendPolyData apd;</div><div> static vtkPolyDataMapper boneMapper;</div><div> static vtkLODActor boneActor;</div><div> static vtkPlanes planes;</div><div> static vtkClipPolyData clipper;</div><div> static vtkPolyDataMapper selectMapper;</div><div> static vtkLODActor selectActor;</div><div> static vtkRenderer ren1;</div><div> static vtkRenderWindow renWin;</div><div> static vtkRenderWindowInteractor iren;</div><div> static vtkBoxWidget boxWidget;</div><div><br></div><div> /// <summary></div><div> /// Callback function for boxWidget.EndInteractionEvt</div><div> /// </summary></div><div> public static void SelectPolygons(vtkObject sender, vtkObjectEventArgs e)</div><div> {</div><div> boxWidget.GetPlanes(planes);</div><div> selectActor.VisibilityOn();</div><div> }</div><div><br></div><div> ///<summary></div><div> ///Deletes all static objects created</div><div> ///</summary></div><div> public static void deleteAllVTKObjects()</div><div> {</div><div> //clean up vtk objects</div><div> if (boneSTL != null) { boneSTL.Dispose(); }</div><div> //if (cone != null) { cone.Dispose(); }</div><div> if (glyph != null) { glyph.Dispose(); }</div><div> //if (apd != null) { apd.Dispose(); }</div><div> if (boneMapper != null) { boneMapper.Dispose(); }</div><div> if (boneActor != null) { boneActor.Dispose(); }</div><div> if (planes != null) { planes.Dispose(); }</div><div> if (clipper != null) { clipper.Dispose(); }</div><div> if (selectMapper != null) { selectMapper.Dispose(); }</div><div> if (selectActor != null) { selectActor.Dispose(); }</div><div> if (ren1 != null) { ren1.Dispose(); }</div><div> if (renWin != null) { renWin.Dispose(); }</div><div> if (iren != null) { iren.Dispose(); }</div><div> if (boxWidget != null) { boxWidget.Dispose(); }</div><div> }</div><div>}</div><div><br></div></div><div><br></div><div><br></div><div><br></div><div>Regards,</div><div>Dieter</div></div>
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